| /* GStreamer |
| * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu> |
| * 2000 Wim Taymans <wtay@chello.be> |
| * |
| * gstpad.c: Pads for linking elements together |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, USA. |
| */ |
| /** |
| * SECTION:gstpad |
| * @short_description: Object contained by elements that allows links to |
| * other elements |
| * @see_also: #GstPadTemplate, #GstElement, #GstEvent |
| * |
| * A #GstElement is linked to other elements via "pads", which are extremely |
| * light-weight generic link points. |
| * After two pads are retrieved from an element with gst_element_get_pad(), |
| * the pads can be link with gst_pad_link(). (For quick links, |
| * you can also use gst_element_link(), which will make the obvious |
| * link for you if it's straightforward.) |
| * |
| * Pads are typically created from a #GstPadTemplate with |
| * gst_pad_new_from_template(). |
| * |
| * Pads have #GstCaps attached to it to describe the media type they are |
| * capable of dealing with. gst_pad_get_caps() and gst_pad_set_caps() are |
| * used to manipulate the caps of the pads. |
| * Pads created from a pad template cannot set capabilities that are |
| * incompatible with the pad template capabilities. |
| * |
| * Pads without pad templates can be created with gst_pad_new(), |
| * which takes a direction and a name as an argument. If the name is NULL, |
| * then a guaranteed unique name will be assigned to it. |
| * |
| * gst_pad_get_parent() will retrieve the #GstElement that owns the pad. |
| * |
| * A #GstElement creating a pad will typically use the various |
| * gst_pad_set_*_function() calls to register callbacks for various events |
| * on the pads. |
| * |
| * GstElements will use gst_pad_push() and gst_pad_pull_range() to push out |
| * or pull in a buffer. |
| * |
| * To send a #GstEvent on a pad, use gst_pad_send_event() and |
| * gst_pad_push_event(). |
| * |
| * Last reviewed on 2006-07-06 (0.10.9) |
| */ |
| |
| #include "gst_private.h" |
| |
| #include "gstpad.h" |
| #include "gstpadtemplate.h" |
| #include "gstenumtypes.h" |
| #include "gstmarshal.h" |
| #include "gstutils.h" |
| #include "gstinfo.h" |
| #include "gsterror.h" |
| #include "gstvalue.h" |
| #include "glib-compat-private.h" |
| |
| GST_DEBUG_CATEGORY_STATIC (debug_dataflow); |
| #define GST_CAT_DEFAULT GST_CAT_PADS |
| |
| /* Pad signals and args */ |
| enum |
| { |
| PAD_LINKED, |
| PAD_UNLINKED, |
| /* FILL ME */ |
| LAST_SIGNAL |
| }; |
| |
| enum |
| { |
| PAD_PROP_0, |
| PAD_PROP_CAPS, |
| PAD_PROP_DIRECTION, |
| PAD_PROP_TEMPLATE, |
| /* FILL ME */ |
| }; |
| |
| #define GST_PAD_GET_PRIVATE(obj) \ |
| (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_PAD, GstPadPrivate)) |
| |
| /* we have a pending and an active event on the pad. On source pads only the |
| * active event is used. On sinkpads, events are copied to the pending entry and |
| * moved to the active event when the eventfunc returned TRUE. */ |
| typedef struct |
| { |
| GstEvent *pending; |
| GstEvent *event; |
| } PadEvent; |
| |
| struct _GstPadPrivate |
| { |
| PadEvent events[GST_EVENT_MAX_STICKY]; |
| |
| gint using; |
| gint probe_cookie; |
| }; |
| |
| typedef struct |
| { |
| GHook hook; |
| guint cookie; |
| } GstProbe; |
| |
| #define PROBE_COOKIE(h) (((GstProbe *)(h))->cookie) |
| |
| typedef struct |
| { |
| GstPad *pad; |
| GstProbeType mask; |
| gpointer type_data; |
| GstProbeReturn ret; |
| gboolean pass; |
| guint cookie; |
| } ProbeMarshall; |
| |
| static void gst_pad_dispose (GObject * object); |
| static void gst_pad_finalize (GObject * object); |
| static void gst_pad_set_property (GObject * object, guint prop_id, |
| const GValue * value, GParamSpec * pspec); |
| static void gst_pad_get_property (GObject * object, guint prop_id, |
| GValue * value, GParamSpec * pspec); |
| |
| static GstCaps *gst_pad_get_caps_unlocked (GstPad * pad, GstCaps * filter); |
| static void gst_pad_set_pad_template (GstPad * pad, GstPadTemplate * templ); |
| static gboolean gst_pad_activate_default (GstPad * pad); |
| static gboolean gst_pad_acceptcaps_default (GstPad * pad, GstCaps * caps); |
| static void gst_pad_fixate_caps_default (GstPad * pad, GstCaps * caps); |
| static GstFlowReturn gst_pad_chain_list_default (GstPad * pad, |
| GstBufferList * list); |
| |
| static GstObjectClass *parent_class = NULL; |
| static guint gst_pad_signals[LAST_SIGNAL] = { 0 }; |
| |
| static GParamSpec *pspec_caps = NULL; |
| |
| /* quarks for probe signals */ |
| static GQuark buffer_quark; |
| static GQuark buffer_list_quark; |
| static GQuark event_quark; |
| |
| typedef struct |
| { |
| const gint ret; |
| const gchar *name; |
| GQuark quark; |
| } GstFlowQuarks; |
| |
| static GstFlowQuarks flow_quarks[] = { |
| {GST_FLOW_CUSTOM_SUCCESS, "custom-success", 0}, |
| {GST_FLOW_RESEND, "resend", 0}, |
| {GST_FLOW_OK, "ok", 0}, |
| {GST_FLOW_NOT_LINKED, "not-linked", 0}, |
| {GST_FLOW_WRONG_STATE, "wrong-state", 0}, |
| {GST_FLOW_UNEXPECTED, "unexpected", 0}, |
| {GST_FLOW_NOT_NEGOTIATED, "not-negotiated", 0}, |
| {GST_FLOW_ERROR, "error", 0}, |
| {GST_FLOW_NOT_SUPPORTED, "not-supported", 0}, |
| {GST_FLOW_CUSTOM_ERROR, "custom-error", 0} |
| }; |
| |
| /** |
| * gst_flow_get_name: |
| * @ret: a #GstFlowReturn to get the name of. |
| * |
| * Gets a string representing the given flow return. |
| * |
| * Returns: a static string with the name of the flow return. |
| */ |
| const gchar * |
| gst_flow_get_name (GstFlowReturn ret) |
| { |
| gint i; |
| |
| ret = CLAMP (ret, GST_FLOW_CUSTOM_ERROR, GST_FLOW_CUSTOM_SUCCESS); |
| |
| for (i = 0; i < G_N_ELEMENTS (flow_quarks); i++) { |
| if (ret == flow_quarks[i].ret) |
| return flow_quarks[i].name; |
| } |
| return "unknown"; |
| } |
| |
| /** |
| * gst_flow_to_quark: |
| * @ret: a #GstFlowReturn to get the quark of. |
| * |
| * Get the unique quark for the given GstFlowReturn. |
| * |
| * Returns: the quark associated with the flow return or 0 if an |
| * invalid return was specified. |
| */ |
| GQuark |
| gst_flow_to_quark (GstFlowReturn ret) |
| { |
| gint i; |
| |
| ret = CLAMP (ret, GST_FLOW_CUSTOM_ERROR, GST_FLOW_CUSTOM_SUCCESS); |
| |
| for (i = 0; i < G_N_ELEMENTS (flow_quarks); i++) { |
| if (ret == flow_quarks[i].ret) |
| return flow_quarks[i].quark; |
| } |
| return 0; |
| } |
| |
| #define _do_init \ |
| { \ |
| gint i; \ |
| \ |
| buffer_quark = g_quark_from_static_string ("buffer"); \ |
| buffer_list_quark = g_quark_from_static_string ("bufferlist"); \ |
| event_quark = g_quark_from_static_string ("event"); \ |
| \ |
| for (i = 0; i < G_N_ELEMENTS (flow_quarks); i++) { \ |
| flow_quarks[i].quark = g_quark_from_static_string (flow_quarks[i].name); \ |
| } \ |
| \ |
| GST_DEBUG_CATEGORY_INIT (debug_dataflow, "GST_DATAFLOW", \ |
| GST_DEBUG_BOLD | GST_DEBUG_FG_GREEN, "dataflow inside pads"); \ |
| } |
| |
| G_DEFINE_TYPE_WITH_CODE (GstPad, gst_pad, GST_TYPE_OBJECT, _do_init); |
| |
| static void |
| gst_pad_class_init (GstPadClass * klass) |
| { |
| GObjectClass *gobject_class; |
| GstObjectClass *gstobject_class; |
| |
| gobject_class = G_OBJECT_CLASS (klass); |
| gstobject_class = GST_OBJECT_CLASS (klass); |
| |
| g_type_class_add_private (klass, sizeof (GstPadPrivate)); |
| |
| parent_class = g_type_class_peek_parent (klass); |
| |
| gobject_class->dispose = gst_pad_dispose; |
| gobject_class->finalize = gst_pad_finalize; |
| gobject_class->set_property = gst_pad_set_property; |
| gobject_class->get_property = gst_pad_get_property; |
| |
| /** |
| * GstPad::linked: |
| * @pad: the pad that emitted the signal |
| * @peer: the peer pad that has been connected |
| * |
| * Signals that a pad has been linked to the peer pad. |
| */ |
| gst_pad_signals[PAD_LINKED] = |
| g_signal_new ("linked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, |
| G_STRUCT_OFFSET (GstPadClass, linked), NULL, NULL, |
| gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD); |
| /** |
| * GstPad::unlinked: |
| * @pad: the pad that emitted the signal |
| * @peer: the peer pad that has been disconnected |
| * |
| * Signals that a pad has been unlinked from the peer pad. |
| */ |
| gst_pad_signals[PAD_UNLINKED] = |
| g_signal_new ("unlinked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, |
| G_STRUCT_OFFSET (GstPadClass, unlinked), NULL, NULL, |
| gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD); |
| |
| pspec_caps = g_param_spec_boxed ("caps", "Caps", |
| "The capabilities of the pad", GST_TYPE_CAPS, |
| G_PARAM_READABLE | G_PARAM_STATIC_STRINGS); |
| g_object_class_install_property (gobject_class, PAD_PROP_CAPS, pspec_caps); |
| |
| g_object_class_install_property (gobject_class, PAD_PROP_DIRECTION, |
| g_param_spec_enum ("direction", "Direction", "The direction of the pad", |
| GST_TYPE_PAD_DIRECTION, GST_PAD_UNKNOWN, |
| G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS)); |
| |
| /* FIXME, Make G_PARAM_CONSTRUCT_ONLY when we fix ghostpads. */ |
| g_object_class_install_property (gobject_class, PAD_PROP_TEMPLATE, |
| g_param_spec_object ("template", "Template", |
| "The GstPadTemplate of this pad", GST_TYPE_PAD_TEMPLATE, |
| G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); |
| |
| gstobject_class->path_string_separator = "."; |
| |
| /* Register common function pointer descriptions */ |
| GST_DEBUG_REGISTER_FUNCPTR (gst_pad_activate_default); |
| GST_DEBUG_REGISTER_FUNCPTR (gst_pad_event_default); |
| GST_DEBUG_REGISTER_FUNCPTR (gst_pad_get_query_types_default); |
| GST_DEBUG_REGISTER_FUNCPTR (gst_pad_query_default); |
| GST_DEBUG_REGISTER_FUNCPTR (gst_pad_iterate_internal_links_default); |
| GST_DEBUG_REGISTER_FUNCPTR (gst_pad_acceptcaps_default); |
| GST_DEBUG_REGISTER_FUNCPTR (gst_pad_chain_list_default); |
| GST_DEBUG_REGISTER_FUNCPTR (gst_pad_fixate_caps_default); |
| } |
| |
| static void |
| gst_pad_init (GstPad * pad) |
| { |
| pad->priv = GST_PAD_GET_PRIVATE (pad); |
| |
| GST_PAD_DIRECTION (pad) = GST_PAD_UNKNOWN; |
| |
| GST_PAD_ACTIVATEFUNC (pad) = gst_pad_activate_default; |
| GST_PAD_EVENTFUNC (pad) = gst_pad_event_default; |
| GST_PAD_QUERYTYPEFUNC (pad) = gst_pad_get_query_types_default; |
| GST_PAD_QUERYFUNC (pad) = gst_pad_query_default; |
| GST_PAD_ITERINTLINKFUNC (pad) = gst_pad_iterate_internal_links_default; |
| GST_PAD_ACCEPTCAPSFUNC (pad) = gst_pad_acceptcaps_default; |
| GST_PAD_FIXATECAPSFUNC (pad) = gst_pad_fixate_caps_default; |
| GST_PAD_CHAINLISTFUNC (pad) = gst_pad_chain_list_default; |
| |
| GST_PAD_SET_FLUSHING (pad); |
| |
| g_static_rec_mutex_init (&pad->stream_rec_lock); |
| |
| pad->block_cond = g_cond_new (); |
| |
| g_hook_list_init (&pad->probes, sizeof (GstProbe)); |
| } |
| |
| /* called when setting the pad inactive. It removes all sticky events from |
| * the pad */ |
| static void |
| clear_events (PadEvent events[]) |
| { |
| guint i; |
| |
| for (i = 0; i < GST_EVENT_MAX_STICKY; i++) { |
| gst_event_replace (&events[i].event, NULL); |
| gst_event_replace (&events[i].pending, NULL); |
| } |
| } |
| |
| /* The sticky event with @idx from the srcpad is copied to the |
| * pending event on the sinkpad (when different). |
| * This function applies the pad offsets in case of segment events. |
| * This will make sure that we send the event to the sinkpad event |
| * function when the next buffer of event arrives. |
| * Should be called with the OBJECT lock of both pads. |
| * This function returns TRUE when there is a pending event on the |
| * sinkpad */ |
| static gboolean |
| replace_event (GstPad * srcpad, GstPad * sinkpad, guint idx) |
| { |
| PadEvent *srcev, *sinkev; |
| GstEvent *event; |
| gboolean pending = FALSE; |
| |
| srcev = &srcpad->priv->events[idx]; |
| |
| if ((event = srcev->event)) { |
| sinkev = &sinkpad->priv->events[idx]; |
| |
| switch (GST_EVENT_TYPE (event)) { |
| case GST_EVENT_SEGMENT: |
| { |
| GstSegment segment; |
| gint64 offset; |
| |
| offset = srcpad->offset + sinkpad->offset; |
| if (offset != 0) { |
| gst_event_copy_segment (event, &segment); |
| /* adjust the base time. FIXME, check negative times, try to tweak the |
| * start to do clipping on negative times */ |
| segment.base += offset; |
| /* make a new event from the updated segment */ |
| event = gst_event_new_segment (&segment); |
| } |
| break; |
| } |
| default: |
| break; |
| } |
| if (sinkev->event != event) { |
| /* put in the pending entry when different */ |
| gst_event_replace (&sinkev->pending, event); |
| pending = TRUE; |
| } |
| } |
| return pending; |
| } |
| |
| |
| static void |
| prepare_event_update (GstPad * srcpad, GstPad * sinkpad) |
| { |
| gboolean pending; |
| gint i; |
| |
| /* make sure we push the events from the source to this new peer, for this we |
| * copy the events on the sinkpad and mark EVENTS_PENDING */ |
| pending = FALSE; |
| for (i = 0; i < GST_EVENT_MAX_STICKY; i++) |
| pending |= replace_event (srcpad, sinkpad, i); |
| |
| /* we had some new pending events, set our flag */ |
| if (pending) |
| GST_OBJECT_FLAG_SET (sinkpad, GST_PAD_NEED_EVENTS); |
| } |
| |
| /* should be called with the OBJECT_LOCK */ |
| static GstCaps * |
| get_pad_caps (GstPad * pad) |
| { |
| GstCaps *caps = NULL; |
| GstEvent *event; |
| guint idx; |
| |
| idx = GST_EVENT_STICKY_IDX_TYPE (GST_EVENT_CAPS); |
| /* we can only use the caps when we have successfully send the caps |
| * event to the event function and is thus in the active entry */ |
| if ((event = pad->priv->events[idx].event)) |
| gst_event_parse_caps (event, &caps); |
| |
| return caps; |
| } |
| |
| static void |
| gst_pad_dispose (GObject * object) |
| { |
| GstPad *pad = GST_PAD_CAST (object); |
| GstPad *peer; |
| |
| GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, pad, "dispose"); |
| |
| /* unlink the peer pad */ |
| if ((peer = gst_pad_get_peer (pad))) { |
| /* window for MT unsafeness, someone else could unlink here |
| * and then we call unlink with wrong pads. The unlink |
| * function would catch this and safely return failed. */ |
| if (GST_PAD_IS_SRC (pad)) |
| gst_pad_unlink (pad, peer); |
| else |
| gst_pad_unlink (peer, pad); |
| |
| gst_object_unref (peer); |
| } |
| |
| gst_pad_set_pad_template (pad, NULL); |
| |
| clear_events (pad->priv->events); |
| |
| g_hook_list_clear (&pad->probes); |
| |
| G_OBJECT_CLASS (parent_class)->dispose (object); |
| } |
| |
| static void |
| gst_pad_finalize (GObject * object) |
| { |
| GstPad *pad = GST_PAD_CAST (object); |
| GstTask *task; |
| |
| /* in case the task is still around, clean it up */ |
| if ((task = GST_PAD_TASK (pad))) { |
| gst_task_join (task); |
| GST_PAD_TASK (pad) = NULL; |
| gst_object_unref (task); |
| } |
| |
| g_static_rec_mutex_free (&pad->stream_rec_lock); |
| g_cond_free (pad->block_cond); |
| |
| G_OBJECT_CLASS (parent_class)->finalize (object); |
| } |
| |
| static void |
| gst_pad_set_property (GObject * object, guint prop_id, |
| const GValue * value, GParamSpec * pspec) |
| { |
| g_return_if_fail (GST_IS_PAD (object)); |
| |
| switch (prop_id) { |
| case PAD_PROP_DIRECTION: |
| GST_PAD_DIRECTION (object) = (GstPadDirection) g_value_get_enum (value); |
| break; |
| case PAD_PROP_TEMPLATE: |
| gst_pad_set_pad_template (GST_PAD_CAST (object), |
| (GstPadTemplate *) g_value_get_object (value)); |
| break; |
| default: |
| G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
| break; |
| } |
| } |
| |
| static void |
| gst_pad_get_property (GObject * object, guint prop_id, |
| GValue * value, GParamSpec * pspec) |
| { |
| g_return_if_fail (GST_IS_PAD (object)); |
| |
| switch (prop_id) { |
| case PAD_PROP_CAPS: |
| GST_OBJECT_LOCK (object); |
| g_value_set_boxed (value, get_pad_caps (GST_PAD_CAST (object))); |
| GST_OBJECT_UNLOCK (object); |
| break; |
| case PAD_PROP_DIRECTION: |
| g_value_set_enum (value, GST_PAD_DIRECTION (object)); |
| break; |
| case PAD_PROP_TEMPLATE: |
| g_value_set_object (value, GST_PAD_PAD_TEMPLATE (object)); |
| break; |
| default: |
| G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
| break; |
| } |
| } |
| |
| /** |
| * gst_pad_new: |
| * @name: the name of the new pad. |
| * @direction: the #GstPadDirection of the pad. |
| * |
| * Creates a new pad with the given name in the given direction. |
| * If name is NULL, a guaranteed unique name (across all pads) |
| * will be assigned. |
| * This function makes a copy of the name so you can safely free the name. |
| * |
| * Returns: (transfer full): a new #GstPad, or NULL in case of an error. |
| * |
| * MT safe. |
| */ |
| GstPad * |
| gst_pad_new (const gchar * name, GstPadDirection direction) |
| { |
| return g_object_new (GST_TYPE_PAD, |
| "name", name, "direction", direction, NULL); |
| } |
| |
| /** |
| * gst_pad_new_from_template: |
| * @templ: the pad template to use |
| * @name: the name of the element |
| * |
| * Creates a new pad with the given name from the given template. |
| * If name is NULL, a guaranteed unique name (across all pads) |
| * will be assigned. |
| * This function makes a copy of the name so you can safely free the name. |
| * |
| * Returns: (transfer full): a new #GstPad, or NULL in case of an error. |
| */ |
| GstPad * |
| gst_pad_new_from_template (GstPadTemplate * templ, const gchar * name) |
| { |
| g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL); |
| |
| return g_object_new (GST_TYPE_PAD, |
| "name", name, "direction", templ->direction, "template", templ, NULL); |
| } |
| |
| /** |
| * gst_pad_new_from_static_template: |
| * @templ: the #GstStaticPadTemplate to use |
| * @name: the name of the element |
| * |
| * Creates a new pad with the given name from the given static template. |
| * If name is NULL, a guaranteed unique name (across all pads) |
| * will be assigned. |
| * This function makes a copy of the name so you can safely free the name. |
| * |
| * Returns: (transfer full): a new #GstPad, or NULL in case of an error. |
| */ |
| GstPad * |
| gst_pad_new_from_static_template (GstStaticPadTemplate * templ, |
| const gchar * name) |
| { |
| GstPad *pad; |
| GstPadTemplate *template; |
| |
| template = gst_static_pad_template_get (templ); |
| pad = gst_pad_new_from_template (template, name); |
| gst_object_unref (template); |
| return pad; |
| } |
| |
| /** |
| * gst_pad_get_direction: |
| * @pad: a #GstPad to get the direction of. |
| * |
| * Gets the direction of the pad. The direction of the pad is |
| * decided at construction time so this function does not take |
| * the LOCK. |
| * |
| * Returns: the #GstPadDirection of the pad. |
| * |
| * MT safe. |
| */ |
| GstPadDirection |
| gst_pad_get_direction (GstPad * pad) |
| { |
| GstPadDirection result; |
| |
| /* PAD_UNKNOWN is a little silly but we need some sort of |
| * error return value */ |
| g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_UNKNOWN); |
| |
| result = GST_PAD_DIRECTION (pad); |
| |
| return result; |
| } |
| |
| static gboolean |
| gst_pad_activate_default (GstPad * pad) |
| { |
| return gst_pad_activate_push (pad, TRUE); |
| } |
| |
| static void |
| pre_activate (GstPad * pad, GstActivateMode new_mode) |
| { |
| switch (new_mode) { |
| case GST_ACTIVATE_PUSH: |
| case GST_ACTIVATE_PULL: |
| GST_OBJECT_LOCK (pad); |
| GST_DEBUG_OBJECT (pad, "setting ACTIVATE_MODE %d, unset flushing", |
| new_mode); |
| GST_PAD_UNSET_FLUSHING (pad); |
| GST_PAD_ACTIVATE_MODE (pad) = new_mode; |
| GST_OBJECT_UNLOCK (pad); |
| break; |
| case GST_ACTIVATE_NONE: |
| GST_OBJECT_LOCK (pad); |
| GST_DEBUG_OBJECT (pad, "setting ACTIVATE_MODE NONE, set flushing"); |
| GST_PAD_SET_FLUSHING (pad); |
| GST_PAD_ACTIVATE_MODE (pad) = new_mode; |
| /* unlock blocked pads so element can resume and stop */ |
| GST_PAD_BLOCK_BROADCAST (pad); |
| GST_OBJECT_UNLOCK (pad); |
| break; |
| } |
| } |
| |
| static void |
| post_activate (GstPad * pad, GstActivateMode new_mode) |
| { |
| switch (new_mode) { |
| case GST_ACTIVATE_PUSH: |
| case GST_ACTIVATE_PULL: |
| /* nop */ |
| break; |
| case GST_ACTIVATE_NONE: |
| /* ensures that streaming stops */ |
| GST_PAD_STREAM_LOCK (pad); |
| GST_DEBUG_OBJECT (pad, "stopped streaming"); |
| GST_OBJECT_LOCK (pad); |
| clear_events (pad->priv->events); |
| GST_OBJECT_UNLOCK (pad); |
| GST_PAD_STREAM_UNLOCK (pad); |
| break; |
| } |
| } |
| |
| /** |
| * gst_pad_set_active: |
| * @pad: the #GstPad to activate or deactivate. |
| * @active: whether or not the pad should be active. |
| * |
| * Activates or deactivates the given pad. |
| * Normally called from within core state change functions. |
| * |
| * If @active, makes sure the pad is active. If it is already active, either in |
| * push or pull mode, just return. Otherwise dispatches to the pad's activate |
| * function to perform the actual activation. |
| * |
| * If not @active, checks the pad's current mode and calls |
| * gst_pad_activate_push() or gst_pad_activate_pull(), as appropriate, with a |
| * FALSE argument. |
| * |
| * Returns: #TRUE if the operation was successful. |
| * |
| * MT safe. |
| */ |
| gboolean |
| gst_pad_set_active (GstPad * pad, gboolean active) |
| { |
| GstActivateMode old; |
| gboolean ret = FALSE; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| |
| GST_OBJECT_LOCK (pad); |
| old = GST_PAD_ACTIVATE_MODE (pad); |
| GST_OBJECT_UNLOCK (pad); |
| |
| if (active) { |
| switch (old) { |
| case GST_ACTIVATE_PUSH: |
| GST_DEBUG_OBJECT (pad, "activating pad from push"); |
| ret = TRUE; |
| break; |
| case GST_ACTIVATE_PULL: |
| GST_DEBUG_OBJECT (pad, "activating pad from pull"); |
| ret = TRUE; |
| break; |
| case GST_ACTIVATE_NONE: |
| GST_DEBUG_OBJECT (pad, "activating pad from none"); |
| ret = (GST_PAD_ACTIVATEFUNC (pad)) (pad); |
| break; |
| default: |
| GST_DEBUG_OBJECT (pad, "unknown activation mode!"); |
| break; |
| } |
| } else { |
| switch (old) { |
| case GST_ACTIVATE_PUSH: |
| GST_DEBUG_OBJECT (pad, "deactivating pad from push"); |
| ret = gst_pad_activate_push (pad, FALSE); |
| break; |
| case GST_ACTIVATE_PULL: |
| GST_DEBUG_OBJECT (pad, "deactivating pad from pull"); |
| ret = gst_pad_activate_pull (pad, FALSE); |
| break; |
| case GST_ACTIVATE_NONE: |
| GST_DEBUG_OBJECT (pad, "deactivating pad from none"); |
| ret = TRUE; |
| break; |
| default: |
| GST_DEBUG_OBJECT (pad, "unknown activation mode!"); |
| break; |
| } |
| } |
| |
| if (!ret) { |
| GST_OBJECT_LOCK (pad); |
| if (!active) { |
| g_critical ("Failed to deactivate pad %s:%s, very bad", |
| GST_DEBUG_PAD_NAME (pad)); |
| } else { |
| GST_WARNING_OBJECT (pad, "Failed to activate pad"); |
| } |
| GST_OBJECT_UNLOCK (pad); |
| } else { |
| if (!active) { |
| GST_OBJECT_LOCK (pad); |
| GST_OBJECT_FLAG_UNSET (pad, GST_PAD_NEED_RECONFIGURE); |
| GST_OBJECT_UNLOCK (pad); |
| } |
| } |
| |
| return ret; |
| } |
| |
| /** |
| * gst_pad_activate_pull: |
| * @pad: the #GstPad to activate or deactivate. |
| * @active: whether or not the pad should be active. |
| * |
| * Activates or deactivates the given pad in pull mode via dispatching to the |
| * pad's activatepullfunc. For use from within pad activation functions only. |
| * When called on sink pads, will first proxy the call to the peer pad, which |
| * is expected to activate its internally linked pads from within its |
| * activate_pull function. |
| * |
| * If you don't know what this is, you probably don't want to call it. |
| * |
| * Returns: TRUE if the operation was successful. |
| * |
| * MT safe. |
| */ |
| gboolean |
| gst_pad_activate_pull (GstPad * pad, gboolean active) |
| { |
| GstActivateMode old, new; |
| GstPad *peer; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| |
| GST_OBJECT_LOCK (pad); |
| old = GST_PAD_ACTIVATE_MODE (pad); |
| GST_OBJECT_UNLOCK (pad); |
| |
| if (active) { |
| switch (old) { |
| case GST_ACTIVATE_PULL: |
| GST_DEBUG_OBJECT (pad, "activating pad from pull, was ok"); |
| goto was_ok; |
| case GST_ACTIVATE_PUSH: |
| GST_DEBUG_OBJECT (pad, |
| "activating pad from push, deactivate push first"); |
| /* pad was activate in the wrong direction, deactivate it |
| * and reactivate it in pull mode */ |
| if (G_UNLIKELY (!gst_pad_activate_push (pad, FALSE))) |
| goto deactivate_failed; |
| /* fallthrough, pad is deactivated now. */ |
| case GST_ACTIVATE_NONE: |
| GST_DEBUG_OBJECT (pad, "activating pad from none"); |
| break; |
| } |
| } else { |
| switch (old) { |
| case GST_ACTIVATE_NONE: |
| GST_DEBUG_OBJECT (pad, "deactivating pad from none, was ok"); |
| goto was_ok; |
| case GST_ACTIVATE_PUSH: |
| GST_DEBUG_OBJECT (pad, "deactivating pad from push, weird"); |
| /* pad was activated in the other direction, deactivate it |
| * in push mode, this should not happen... */ |
| if (G_UNLIKELY (!gst_pad_activate_push (pad, FALSE))) |
| goto deactivate_failed; |
| /* everything is fine now */ |
| goto was_ok; |
| case GST_ACTIVATE_PULL: |
| GST_DEBUG_OBJECT (pad, "deactivating pad from pull"); |
| break; |
| } |
| } |
| |
| if (gst_pad_get_direction (pad) == GST_PAD_SINK) { |
| if ((peer = gst_pad_get_peer (pad))) { |
| GST_DEBUG_OBJECT (pad, "calling peer"); |
| if (G_UNLIKELY (!gst_pad_activate_pull (peer, active))) |
| goto peer_failed; |
| gst_object_unref (peer); |
| } else { |
| /* there is no peer, this is only fatal when we activate. When we |
| * deactivate, we must assume the application has unlinked the peer and |
| * will deactivate it eventually. */ |
| if (active) |
| goto not_linked; |
| else |
| GST_DEBUG_OBJECT (pad, "deactivating unlinked pad"); |
| } |
| } else { |
| if (G_UNLIKELY (GST_PAD_GETRANGEFUNC (pad) == NULL)) |
| goto failure; /* Can't activate pull on a src without a |
| getrange function */ |
| } |
| |
| new = active ? GST_ACTIVATE_PULL : GST_ACTIVATE_NONE; |
| pre_activate (pad, new); |
| |
| if (GST_PAD_ACTIVATEPULLFUNC (pad)) { |
| if (G_UNLIKELY (!GST_PAD_ACTIVATEPULLFUNC (pad) (pad, active))) |
| goto failure; |
| } else { |
| /* can happen for sinks of passthrough elements */ |
| } |
| |
| post_activate (pad, new); |
| |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "%s in pull mode", |
| active ? "activated" : "deactivated"); |
| |
| return TRUE; |
| |
| was_ok: |
| { |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "already %s in pull mode", |
| active ? "activated" : "deactivated"); |
| return TRUE; |
| } |
| deactivate_failed: |
| { |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, |
| "failed to %s in switch to pull from mode %d", |
| (active ? "activate" : "deactivate"), old); |
| return FALSE; |
| } |
| peer_failed: |
| { |
| GST_OBJECT_LOCK (peer); |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, |
| "activate_pull on peer (%s:%s) failed", GST_DEBUG_PAD_NAME (peer)); |
| GST_OBJECT_UNLOCK (peer); |
| gst_object_unref (peer); |
| return FALSE; |
| } |
| not_linked: |
| { |
| GST_CAT_INFO_OBJECT (GST_CAT_PADS, pad, "can't activate unlinked sink " |
| "pad in pull mode"); |
| return FALSE; |
| } |
| failure: |
| { |
| GST_OBJECT_LOCK (pad); |
| GST_CAT_INFO_OBJECT (GST_CAT_PADS, pad, "failed to %s in pull mode", |
| active ? "activate" : "deactivate"); |
| GST_PAD_SET_FLUSHING (pad); |
| GST_PAD_ACTIVATE_MODE (pad) = old; |
| GST_OBJECT_UNLOCK (pad); |
| return FALSE; |
| } |
| } |
| |
| /** |
| * gst_pad_activate_push: |
| * @pad: the #GstPad to activate or deactivate. |
| * @active: whether the pad should be active or not. |
| * |
| * Activates or deactivates the given pad in push mode via dispatching to the |
| * pad's activatepushfunc. For use from within pad activation functions only. |
| * |
| * If you don't know what this is, you probably don't want to call it. |
| * |
| * Returns: %TRUE if the operation was successful. |
| * |
| * MT safe. |
| */ |
| gboolean |
| gst_pad_activate_push (GstPad * pad, gboolean active) |
| { |
| GstActivateMode old, new; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "trying to set %s in push mode", |
| active ? "activated" : "deactivated"); |
| |
| GST_OBJECT_LOCK (pad); |
| old = GST_PAD_ACTIVATE_MODE (pad); |
| GST_OBJECT_UNLOCK (pad); |
| |
| if (active) { |
| switch (old) { |
| case GST_ACTIVATE_PUSH: |
| GST_DEBUG_OBJECT (pad, "activating pad from push, was ok"); |
| goto was_ok; |
| case GST_ACTIVATE_PULL: |
| GST_DEBUG_OBJECT (pad, |
| "activating pad from push, deactivating pull first"); |
| /* pad was activate in the wrong direction, deactivate it |
| * an reactivate it in push mode */ |
| if (G_UNLIKELY (!gst_pad_activate_pull (pad, FALSE))) |
| goto deactivate_failed; |
| /* fallthrough, pad is deactivated now. */ |
| case GST_ACTIVATE_NONE: |
| GST_DEBUG_OBJECT (pad, "activating pad from none"); |
| break; |
| } |
| } else { |
| switch (old) { |
| case GST_ACTIVATE_NONE: |
| GST_DEBUG_OBJECT (pad, "deactivating pad from none, was ok"); |
| goto was_ok; |
| case GST_ACTIVATE_PULL: |
| GST_DEBUG_OBJECT (pad, "deactivating pad from pull, weird"); |
| /* pad was activated in the other direction, deactivate it |
| * in pull mode, this should not happen... */ |
| if (G_UNLIKELY (!gst_pad_activate_pull (pad, FALSE))) |
| goto deactivate_failed; |
| /* everything is fine now */ |
| goto was_ok; |
| case GST_ACTIVATE_PUSH: |
| GST_DEBUG_OBJECT (pad, "deactivating pad from push"); |
| break; |
| } |
| } |
| |
| new = active ? GST_ACTIVATE_PUSH : GST_ACTIVATE_NONE; |
| pre_activate (pad, new); |
| |
| if (GST_PAD_ACTIVATEPUSHFUNC (pad)) { |
| if (G_UNLIKELY (!GST_PAD_ACTIVATEPUSHFUNC (pad) (pad, active))) { |
| goto failure; |
| } |
| } else { |
| /* quite ok, element relies on state change func to prepare itself */ |
| } |
| |
| post_activate (pad, new); |
| |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "%s in push mode", |
| active ? "activated" : "deactivated"); |
| return TRUE; |
| |
| was_ok: |
| { |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "already %s in push mode", |
| active ? "activated" : "deactivated"); |
| return TRUE; |
| } |
| deactivate_failed: |
| { |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, |
| "failed to %s in switch to push from mode %d", |
| (active ? "activate" : "deactivate"), old); |
| return FALSE; |
| } |
| failure: |
| { |
| GST_OBJECT_LOCK (pad); |
| GST_CAT_INFO_OBJECT (GST_CAT_PADS, pad, "failed to %s in push mode", |
| active ? "activate" : "deactivate"); |
| GST_PAD_SET_FLUSHING (pad); |
| GST_PAD_ACTIVATE_MODE (pad) = old; |
| GST_OBJECT_UNLOCK (pad); |
| return FALSE; |
| } |
| } |
| |
| /** |
| * gst_pad_is_active: |
| * @pad: the #GstPad to query |
| * |
| * Query if a pad is active |
| * |
| * Returns: TRUE if the pad is active. |
| * |
| * MT safe. |
| */ |
| gboolean |
| gst_pad_is_active (GstPad * pad) |
| { |
| gboolean result = FALSE; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| |
| GST_OBJECT_LOCK (pad); |
| result = GST_PAD_IS_ACTIVE (pad); |
| GST_OBJECT_UNLOCK (pad); |
| |
| return result; |
| } |
| |
| /** |
| * gst_pad_add_probe: |
| * @pad: the #GstPad to add the probe to |
| * @mask: the probe mask |
| * @callback: #GstPadProbeCallback that will be called with notifications of |
| * the pad state |
| * @user_data: (closure): user data passed to the callback |
| * @destroy_data: #GDestroyNotify for user_data |
| * |
| * Be notified of different states of pads. The provided callback is called for |
| * every state that matches @mask. |
| * |
| * <note> |
| * Pad probe handlers are only called for source pads in push mode |
| * and sink pads in pull mode. |
| * </note> |
| * |
| * Returns: an id or 0 on error. The id can be used to remove the probe with |
| * gst_pad_remove_probe(). |
| * |
| * MT safe. |
| */ |
| gulong |
| gst_pad_add_probe (GstPad * pad, GstProbeType mask, |
| GstPadProbeCallback callback, gpointer user_data, |
| GDestroyNotify destroy_data) |
| { |
| GHook *hook; |
| gulong res; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), 0); |
| g_return_val_if_fail (mask != 0, 0); |
| |
| GST_OBJECT_LOCK (pad); |
| /* make a new probe */ |
| hook = g_hook_alloc (&pad->probes); |
| |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "adding probe for mask 0x%08x", |
| mask); |
| |
| /* when no contraints are given for the types, assume all types are |
| * acceptable */ |
| if ((mask & GST_PROBE_TYPE_DATA) == 0) |
| mask |= GST_PROBE_TYPE_DATA; |
| if ((mask & GST_PROBE_TYPE_SCHEDULING) == 0) |
| mask |= GST_PROBE_TYPE_SCHEDULING; |
| |
| /* store our flags and other fields */ |
| hook->flags |= (mask << G_HOOK_FLAG_USER_SHIFT); |
| hook->func = callback; |
| hook->data = user_data; |
| hook->destroy = destroy_data; |
| PROBE_COOKIE (hook) = 0; |
| |
| /* incremenent cookie so that the new hook get's called */ |
| pad->priv->probe_cookie++; |
| |
| /* add the probe */ |
| g_hook_prepend (&pad->probes, hook); |
| pad->num_probes++; |
| |
| /* get the id of the hook, we return this and it can be used to remove the |
| * probe later */ |
| res = hook->hook_id; |
| |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "got probe id %lu", res); |
| |
| if (mask & GST_PROBE_TYPE_BLOCKING) { |
| /* we have a block probe */ |
| pad->num_blocked++; |
| GST_OBJECT_FLAG_SET (pad, GST_PAD_BLOCKED); |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "added blocking probe, " |
| "now %d blocking probes", pad->num_blocked); |
| } |
| |
| /* call the callback if we need to be called for idle callbacks */ |
| if ((mask & GST_PROBE_TYPE_IDLE) && (callback != NULL)) { |
| if (pad->priv->using > 0) { |
| /* the pad is in use, we can't signal the idle callback yet. Since we set the |
| * flag above, the last thread to leave the push will do the callback. New |
| * threads going into the push will block. */ |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "pad is in use, delay idle callback"); |
| GST_OBJECT_UNLOCK (pad); |
| } else { |
| /* the pad is idle now, we can signal the idle callback now */ |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "pad is idle, trigger idle callback"); |
| GST_OBJECT_UNLOCK (pad); |
| |
| callback (pad, GST_PROBE_TYPE_IDLE, NULL, user_data); |
| } |
| } else { |
| GST_OBJECT_UNLOCK (pad); |
| } |
| return res; |
| } |
| |
| static void |
| cleanup_hook (GstPad * pad, GHook * hook) |
| { |
| GstProbeType type; |
| |
| type = (hook->flags) >> G_HOOK_FLAG_USER_SHIFT; |
| |
| if (type & GST_PROBE_TYPE_BLOCKING) { |
| /* unblock when we remove the last blocking probe */ |
| pad->num_blocked--; |
| GST_DEBUG_OBJECT (pad, "remove blocking probe, now %d left", |
| pad->num_blocked); |
| if (pad->num_blocked == 0) { |
| GST_DEBUG_OBJECT (pad, "last blocking probe removed, unblocking"); |
| GST_OBJECT_FLAG_UNSET (pad, GST_PAD_BLOCKED); |
| GST_PAD_BLOCK_BROADCAST (pad); |
| } |
| } |
| g_hook_destroy_link (&pad->probes, hook); |
| pad->num_probes--; |
| } |
| |
| /** |
| * gst_pad_remove_probe: |
| * @pad: the #GstPad with the probe |
| * @id: the probe id to remove |
| * |
| * Remove the probe with @id from @pad. |
| * |
| * MT safe. |
| */ |
| void |
| gst_pad_remove_probe (GstPad * pad, gulong id) |
| { |
| GHook *hook; |
| |
| g_return_if_fail (GST_IS_PAD (pad)); |
| |
| GST_OBJECT_LOCK (pad); |
| |
| hook = g_hook_get (&pad->probes, id); |
| if (hook == NULL) |
| goto not_found; |
| |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "removing hook %ld", |
| hook->hook_id); |
| cleanup_hook (pad, hook); |
| GST_OBJECT_UNLOCK (pad); |
| |
| return; |
| |
| not_found: |
| { |
| GST_OBJECT_UNLOCK (pad); |
| g_warning ("%s: pad `%p' has no probe with id `%lu'", G_STRLOC, pad, id); |
| return; |
| } |
| } |
| |
| /** |
| * gst_pad_is_blocked: |
| * @pad: the #GstPad to query |
| * |
| * Checks if the pad is blocked or not. This function returns the |
| * last requested state of the pad. It is not certain that the pad |
| * is actually blocking at this point (see gst_pad_is_blocking()). |
| * |
| * Returns: TRUE if the pad is blocked. |
| * |
| * MT safe. |
| */ |
| gboolean |
| gst_pad_is_blocked (GstPad * pad) |
| { |
| gboolean result = FALSE; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), result); |
| |
| GST_OBJECT_LOCK (pad); |
| result = GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_BLOCKED); |
| GST_OBJECT_UNLOCK (pad); |
| |
| return result; |
| } |
| |
| /** |
| * gst_pad_is_blocking: |
| * @pad: the #GstPad to query |
| * |
| * Checks if the pad is blocking or not. This is a guaranteed state |
| * of whether the pad is actually blocking on a #GstBuffer or a #GstEvent. |
| * |
| * Returns: TRUE if the pad is blocking. |
| * |
| * MT safe. |
| * |
| * Since: 0.10.11 |
| */ |
| gboolean |
| gst_pad_is_blocking (GstPad * pad) |
| { |
| gboolean result = FALSE; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), result); |
| |
| GST_OBJECT_LOCK (pad); |
| /* the blocking flag is only valid if the pad is not flushing */ |
| result = GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_BLOCKING) && |
| !GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLUSHING); |
| GST_OBJECT_UNLOCK (pad); |
| |
| return result; |
| } |
| |
| /** |
| * gst_pad_check_reconfigure: |
| * @pad: the #GstPad to check |
| * |
| * Check and clear the #GST_PAD_NEED_RECONFIGURE flag on @pad and return %TRUE |
| * if the flag was set. |
| * |
| * Returns: %TRUE is the GST_PAD_NEED_RECONFIGURE flag was set on @pad. |
| */ |
| gboolean |
| gst_pad_check_reconfigure (GstPad * pad) |
| { |
| gboolean reconfigure; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| |
| GST_OBJECT_LOCK (pad); |
| reconfigure = GST_PAD_NEEDS_RECONFIGURE (pad); |
| GST_OBJECT_FLAG_UNSET (pad, GST_PAD_NEED_RECONFIGURE); |
| GST_OBJECT_UNLOCK (pad); |
| |
| return reconfigure; |
| } |
| |
| /** |
| * gst_pad_mark_reconfigure: |
| * @pad: the #GstPad to mark |
| * |
| * Mark a pad for needing reconfiguration. The next call to |
| * gst_pad_check_reconfigure() will return %TRUE after this call. |
| */ |
| void |
| gst_pad_mark_reconfigure (GstPad * pad) |
| { |
| g_return_if_fail (GST_IS_PAD (pad)); |
| |
| GST_OBJECT_LOCK (pad); |
| GST_OBJECT_FLAG_SET (pad, GST_PAD_NEED_RECONFIGURE); |
| GST_OBJECT_UNLOCK (pad); |
| } |
| |
| /** |
| * gst_pad_set_activate_function: |
| * @pad: a #GstPad. |
| * @activate: the #GstPadActivateFunction to set. |
| * |
| * Sets the given activate function for @pad. The activate function will |
| * dispatch to gst_pad_activate_push() or gst_pad_activate_pull() to perform |
| * the actual activation. Only makes sense to set on sink pads. |
| * |
| * Call this function if your sink pad can start a pull-based task. |
| */ |
| void |
| gst_pad_set_activate_function (GstPad * pad, GstPadActivateFunction activate) |
| { |
| g_return_if_fail (GST_IS_PAD (pad)); |
| |
| GST_PAD_ACTIVATEFUNC (pad) = activate; |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "activatefunc set to %s", |
| GST_DEBUG_FUNCPTR_NAME (activate)); |
| } |
| |
| /** |
| * gst_pad_set_activatepull_function: |
| * @pad: a #GstPad. |
| * @activatepull: the #GstPadActivateModeFunction to set. |
| * |
| * Sets the given activate_pull function for the pad. An activate_pull function |
| * prepares the element and any upstream connections for pulling. See XXX |
| * part-activation.txt for details. |
| */ |
| void |
| gst_pad_set_activatepull_function (GstPad * pad, |
| GstPadActivateModeFunction activatepull) |
| { |
| g_return_if_fail (GST_IS_PAD (pad)); |
| |
| GST_PAD_ACTIVATEPULLFUNC (pad) = activatepull; |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "activatepullfunc set to %s", |
| GST_DEBUG_FUNCPTR_NAME (activatepull)); |
| } |
| |
| /** |
| * gst_pad_set_activatepush_function: |
| * @pad: a #GstPad. |
| * @activatepush: the #GstPadActivateModeFunction to set. |
| * |
| * Sets the given activate_push function for the pad. An activate_push function |
| * prepares the element for pushing. See XXX part-activation.txt for details. |
| */ |
| void |
| gst_pad_set_activatepush_function (GstPad * pad, |
| GstPadActivateModeFunction activatepush) |
| { |
| g_return_if_fail (GST_IS_PAD (pad)); |
| |
| GST_PAD_ACTIVATEPUSHFUNC (pad) = activatepush; |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "activatepushfunc set to %s", |
| GST_DEBUG_FUNCPTR_NAME (activatepush)); |
| } |
| |
| /** |
| * gst_pad_set_chain_function: |
| * @pad: a sink #GstPad. |
| * @chain: the #GstPadChainFunction to set. |
| * |
| * Sets the given chain function for the pad. The chain function is called to |
| * process a #GstBuffer input buffer. see #GstPadChainFunction for more details. |
| */ |
| void |
| gst_pad_set_chain_function (GstPad * pad, GstPadChainFunction chain) |
| { |
| g_return_if_fail (GST_IS_PAD (pad)); |
| g_return_if_fail (GST_PAD_IS_SINK (pad)); |
| |
| GST_PAD_CHAINFUNC (pad) = chain; |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "chainfunc set to %s", |
| GST_DEBUG_FUNCPTR_NAME (chain)); |
| } |
| |
| /** |
| * gst_pad_set_chain_list_function: |
| * @pad: a sink #GstPad. |
| * @chainlist: the #GstPadChainListFunction to set. |
| * |
| * Sets the given chain list function for the pad. The chainlist function is |
| * called to process a #GstBufferList input buffer list. See |
| * #GstPadChainListFunction for more details. |
| * |
| * Since: 0.10.24 |
| */ |
| void |
| gst_pad_set_chain_list_function (GstPad * pad, |
| GstPadChainListFunction chainlist) |
| { |
| g_return_if_fail (GST_IS_PAD (pad)); |
| g_return_if_fail (GST_PAD_IS_SINK (pad)); |
| |
| GST_PAD_CHAINLISTFUNC (pad) = chainlist; |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "chainlistfunc set to %s", |
| GST_DEBUG_FUNCPTR_NAME (chainlist)); |
| } |
| |
| /** |
| * gst_pad_set_getrange_function: |
| * @pad: a source #GstPad. |
| * @get: the #GstPadGetRangeFunction to set. |
| * |
| * Sets the given getrange function for the pad. The getrange function is |
| * called to produce a new #GstBuffer to start the processing pipeline. see |
| * #GstPadGetRangeFunction for a description of the getrange function. |
| */ |
| void |
| gst_pad_set_getrange_function (GstPad * pad, GstPadGetRangeFunction get) |
| { |
| g_return_if_fail (GST_IS_PAD (pad)); |
| g_return_if_fail (GST_PAD_IS_SRC (pad)); |
| |
| GST_PAD_GETRANGEFUNC (pad) = get; |
| |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "getrangefunc set to %s", |
| GST_DEBUG_FUNCPTR_NAME (get)); |
| } |
| |
| /** |
| * gst_pad_set_event_function: |
| * @pad: a #GstPad of either direction. |
| * @event: the #GstPadEventFunction to set. |
| * |
| * Sets the given event handler for the pad. |
| */ |
| void |
| gst_pad_set_event_function (GstPad * pad, GstPadEventFunction event) |
| { |
| g_return_if_fail (GST_IS_PAD (pad)); |
| |
| GST_PAD_EVENTFUNC (pad) = event; |
| |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "eventfunc for set to %s", |
| GST_DEBUG_FUNCPTR_NAME (event)); |
| } |
| |
| /** |
| * gst_pad_set_query_function: |
| * @pad: a #GstPad of either direction. |
| * @query: the #GstPadQueryFunction to set. |
| * |
| * Set the given query function for the pad. |
| */ |
| void |
| gst_pad_set_query_function (GstPad * pad, GstPadQueryFunction query) |
| { |
| g_return_if_fail (GST_IS_PAD (pad)); |
| |
| GST_PAD_QUERYFUNC (pad) = query; |
| |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "queryfunc set to %s", |
| GST_DEBUG_FUNCPTR_NAME (query)); |
| } |
| |
| /** |
| * gst_pad_set_query_type_function: |
| * @pad: a #GstPad of either direction. |
| * @type_func: the #GstPadQueryTypeFunction to set. |
| * |
| * Set the given query type function for the pad. |
| */ |
| void |
| gst_pad_set_query_type_function (GstPad * pad, |
| GstPadQueryTypeFunction type_func) |
| { |
| g_return_if_fail (GST_IS_PAD (pad)); |
| |
| GST_PAD_QUERYTYPEFUNC (pad) = type_func; |
| |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "querytypefunc set to %s", |
| GST_DEBUG_FUNCPTR_NAME (type_func)); |
| } |
| |
| /** |
| * gst_pad_get_query_types: |
| * @pad: a #GstPad. |
| * |
| * Get an array of supported queries that can be performed |
| * on this pad. |
| * |
| * Returns: (transfer none) (array zero-terminated=1): a zero-terminated array |
| * of #GstQueryType. |
| */ |
| const GstQueryType * |
| gst_pad_get_query_types (GstPad * pad) |
| { |
| GstPadQueryTypeFunction func; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), NULL); |
| |
| if (G_UNLIKELY ((func = GST_PAD_QUERYTYPEFUNC (pad)) == NULL)) |
| goto no_func; |
| |
| return func (pad); |
| |
| no_func: |
| { |
| return NULL; |
| } |
| } |
| |
| static gboolean |
| gst_pad_get_query_types_dispatcher (GstPad * pad, const GstQueryType ** data) |
| { |
| GstPad *peer; |
| |
| if ((peer = gst_pad_get_peer (pad))) { |
| *data = gst_pad_get_query_types (peer); |
| gst_object_unref (peer); |
| } |
| return TRUE; |
| } |
| |
| /** |
| * gst_pad_get_query_types_default: |
| * @pad: a #GstPad. |
| * |
| * Invoke the default query types function on the pad. This function will get |
| * the supported query type from the peer of an internally linked pad of @pad. |
| * |
| * Returns: (transfer none) (array zero-terminated=1): a zero-terminated array |
| * of #GstQueryType, or NULL if none of the internally-linked pads has a |
| * query types function. |
| */ |
| const GstQueryType * |
| gst_pad_get_query_types_default (GstPad * pad) |
| { |
| GstQueryType *result = NULL; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), NULL); |
| |
| gst_pad_forward (pad, (GstPadForwardFunction) |
| gst_pad_get_query_types_dispatcher, &result); |
| |
| return result; |
| } |
| |
| /** |
| * gst_pad_set_iterate_internal_links_function: |
| * @pad: a #GstPad of either direction. |
| * @iterintlink: the #GstPadIterIntLinkFunction to set. |
| * |
| * Sets the given internal link iterator function for the pad. |
| * |
| * Since: 0.10.21 |
| */ |
| void |
| gst_pad_set_iterate_internal_links_function (GstPad * pad, |
| GstPadIterIntLinkFunction iterintlink) |
| { |
| g_return_if_fail (GST_IS_PAD (pad)); |
| |
| GST_PAD_ITERINTLINKFUNC (pad) = iterintlink; |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "internal link iterator set to %s", |
| GST_DEBUG_FUNCPTR_NAME (iterintlink)); |
| } |
| |
| /** |
| * gst_pad_set_link_function: |
| * @pad: a #GstPad. |
| * @link: the #GstPadLinkFunction to set. |
| * |
| * Sets the given link function for the pad. It will be called when |
| * the pad is linked with another pad. |
| * |
| * The return value #GST_PAD_LINK_OK should be used when the connection can be |
| * made. |
| * |
| * The return value #GST_PAD_LINK_REFUSED should be used when the connection |
| * cannot be made for some reason. |
| * |
| * If @link is installed on a source pad, it should call the #GstPadLinkFunction |
| * of the peer sink pad, if present. |
| */ |
| void |
| gst_pad_set_link_function (GstPad * pad, GstPadLinkFunction link) |
| { |
| g_return_if_fail (GST_IS_PAD (pad)); |
| |
| GST_PAD_LINKFUNC (pad) = link; |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "linkfunc set to %s", |
| GST_DEBUG_FUNCPTR_NAME (link)); |
| } |
| |
| /** |
| * gst_pad_set_unlink_function: |
| * @pad: a #GstPad. |
| * @unlink: the #GstPadUnlinkFunction to set. |
| * |
| * Sets the given unlink function for the pad. It will be called |
| * when the pad is unlinked. |
| */ |
| void |
| gst_pad_set_unlink_function (GstPad * pad, GstPadUnlinkFunction unlink) |
| { |
| g_return_if_fail (GST_IS_PAD (pad)); |
| |
| GST_PAD_UNLINKFUNC (pad) = unlink; |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "unlinkfunc set to %s", |
| GST_DEBUG_FUNCPTR_NAME (unlink)); |
| } |
| |
| /** |
| * gst_pad_set_getcaps_function: |
| * @pad: a #GstPad. |
| * @getcaps: the #GstPadGetCapsFunction to set. |
| * |
| * Sets the given getcaps function for the pad. @getcaps should return the |
| * allowable caps for a pad in the context of the element's state, its link to |
| * other elements, and the devices or files it has opened. These caps must be a |
| * subset of the pad template caps. In the NULL state with no links, @getcaps |
| * should ideally return the same caps as the pad template. In rare |
| * circumstances, an object property can affect the caps returned by @getcaps, |
| * but this is discouraged. |
| * |
| * You do not need to call this function if @pad's allowed caps are always the |
| * same as the pad template caps. This can only be true if the padtemplate |
| * has fixed simple caps. |
| * |
| * For most filters, the caps returned by @getcaps is directly affected by the |
| * allowed caps on other pads. For demuxers and decoders, the caps returned by |
| * the srcpad's getcaps function is directly related to the stream data. Again, |
| * @getcaps should return the most specific caps it reasonably can, since this |
| * helps with autoplugging. |
| * |
| * Note that the return value from @getcaps is owned by the caller, so the |
| * caller should unref the caps after usage. |
| */ |
| void |
| gst_pad_set_getcaps_function (GstPad * pad, GstPadGetCapsFunction getcaps) |
| { |
| g_return_if_fail (GST_IS_PAD (pad)); |
| |
| GST_PAD_GETCAPSFUNC (pad) = getcaps; |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "getcapsfunc set to %s", |
| GST_DEBUG_FUNCPTR_NAME (getcaps)); |
| } |
| |
| /** |
| * gst_pad_set_acceptcaps_function: |
| * @pad: a #GstPad. |
| * @acceptcaps: the #GstPadAcceptCapsFunction to set. |
| * |
| * Sets the given acceptcaps function for the pad. The acceptcaps function |
| * will be called to check if the pad can accept the given caps. Setting the |
| * acceptcaps function to NULL restores the default behaviour of allowing |
| * any caps that matches the caps from gst_pad_get_caps(). |
| */ |
| void |
| gst_pad_set_acceptcaps_function (GstPad * pad, |
| GstPadAcceptCapsFunction acceptcaps) |
| { |
| g_return_if_fail (GST_IS_PAD (pad)); |
| |
| GST_PAD_ACCEPTCAPSFUNC (pad) = acceptcaps; |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "acceptcapsfunc set to %s", |
| GST_DEBUG_FUNCPTR_NAME (acceptcaps)); |
| } |
| |
| /** |
| * gst_pad_set_fixatecaps_function: |
| * @pad: a #GstPad. |
| * @fixatecaps: the #GstPadFixateCapsFunction to set. |
| * |
| * Sets the given fixatecaps function for the pad. The fixatecaps function |
| * will be called whenever the default values for a GstCaps needs to be |
| * filled in. |
| */ |
| void |
| gst_pad_set_fixatecaps_function (GstPad * pad, |
| GstPadFixateCapsFunction fixatecaps) |
| { |
| g_return_if_fail (GST_IS_PAD (pad)); |
| |
| GST_PAD_FIXATECAPSFUNC (pad) = fixatecaps; |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "fixatecapsfunc set to %s", |
| GST_DEBUG_FUNCPTR_NAME (fixatecaps)); |
| } |
| |
| /** |
| * gst_pad_unlink: |
| * @srcpad: the source #GstPad to unlink. |
| * @sinkpad: the sink #GstPad to unlink. |
| * |
| * Unlinks the source pad from the sink pad. Will emit the #GstPad::unlinked |
| * signal on both pads. |
| * |
| * Returns: TRUE if the pads were unlinked. This function returns FALSE if |
| * the pads were not linked together. |
| * |
| * MT safe. |
| */ |
| gboolean |
| gst_pad_unlink (GstPad * srcpad, GstPad * sinkpad) |
| { |
| gboolean result = FALSE; |
| GstElement *parent = NULL; |
| gint i; |
| |
| g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE); |
| g_return_val_if_fail (GST_PAD_IS_SRC (srcpad), FALSE); |
| g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE); |
| g_return_val_if_fail (GST_PAD_IS_SINK (sinkpad), FALSE); |
| |
| GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "unlinking %s:%s(%p) and %s:%s(%p)", |
| GST_DEBUG_PAD_NAME (srcpad), srcpad, |
| GST_DEBUG_PAD_NAME (sinkpad), sinkpad); |
| |
| /* We need to notify the parent before taking any pad locks as the bin in |
| * question might be waiting for a lock on the pad while holding its lock |
| * that our message will try to take. */ |
| if ((parent = GST_ELEMENT_CAST (gst_pad_get_parent (srcpad)))) { |
| if (GST_IS_ELEMENT (parent)) { |
| gst_element_post_message (parent, |
| gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad), |
| GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK, parent, TRUE)); |
| } else { |
| gst_object_unref (parent); |
| parent = NULL; |
| } |
| } |
| |
| GST_OBJECT_LOCK (srcpad); |
| GST_OBJECT_LOCK (sinkpad); |
| |
| if (G_UNLIKELY (GST_PAD_PEER (srcpad) != sinkpad)) |
| goto not_linked_together; |
| |
| if (GST_PAD_UNLINKFUNC (srcpad)) { |
| GST_PAD_UNLINKFUNC (srcpad) (srcpad); |
| } |
| if (GST_PAD_UNLINKFUNC (sinkpad)) { |
| GST_PAD_UNLINKFUNC (sinkpad) (sinkpad); |
| } |
| |
| /* first clear peers */ |
| GST_PAD_PEER (srcpad) = NULL; |
| GST_PAD_PEER (sinkpad) = NULL; |
| |
| /* clear pending caps if any */ |
| for (i = 0; i < GST_EVENT_MAX_STICKY; i++) |
| gst_event_replace (&sinkpad->priv->events[i].pending, NULL); |
| |
| GST_OBJECT_UNLOCK (sinkpad); |
| GST_OBJECT_UNLOCK (srcpad); |
| |
| /* fire off a signal to each of the pads telling them |
| * that they've been unlinked */ |
| g_signal_emit (srcpad, gst_pad_signals[PAD_UNLINKED], 0, sinkpad); |
| g_signal_emit (sinkpad, gst_pad_signals[PAD_UNLINKED], 0, srcpad); |
| |
| GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "unlinked %s:%s and %s:%s", |
| GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad)); |
| |
| result = TRUE; |
| |
| done: |
| if (parent != NULL) { |
| gst_element_post_message (parent, |
| gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad), |
| GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK, parent, FALSE)); |
| gst_object_unref (parent); |
| } |
| return result; |
| |
| /* ERRORS */ |
| not_linked_together: |
| { |
| /* we do not emit a warning in this case because unlinking cannot |
| * be made MT safe.*/ |
| GST_OBJECT_UNLOCK (sinkpad); |
| GST_OBJECT_UNLOCK (srcpad); |
| goto done; |
| } |
| } |
| |
| /** |
| * gst_pad_is_linked: |
| * @pad: pad to check |
| * |
| * Checks if a @pad is linked to another pad or not. |
| * |
| * Returns: TRUE if the pad is linked, FALSE otherwise. |
| * |
| * MT safe. |
| */ |
| gboolean |
| gst_pad_is_linked (GstPad * pad) |
| { |
| gboolean result; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| |
| GST_OBJECT_LOCK (pad); |
| result = (GST_PAD_PEER (pad) != NULL); |
| GST_OBJECT_UNLOCK (pad); |
| |
| return result; |
| } |
| |
| /* get the caps from both pads and see if the intersection |
| * is not empty. |
| * |
| * This function should be called with the pad LOCK on both |
| * pads |
| */ |
| static gboolean |
| gst_pad_link_check_compatible_unlocked (GstPad * src, GstPad * sink, |
| GstPadLinkCheck flags) |
| { |
| GstCaps *srccaps = NULL; |
| GstCaps *sinkcaps = NULL; |
| gboolean compatible = FALSE; |
| |
| if (!(flags & (GST_PAD_LINK_CHECK_CAPS | GST_PAD_LINK_CHECK_TEMPLATE_CAPS))) |
| return TRUE; |
| |
| /* Doing the expensive caps checking takes priority over only checking the template caps */ |
| if (flags & GST_PAD_LINK_CHECK_CAPS) { |
| srccaps = gst_pad_get_caps_unlocked (src, NULL); |
| sinkcaps = gst_pad_get_caps_unlocked (sink, NULL); |
| } else { |
| /* If one of the two pads doesn't have a template, consider the intersection |
| * as valid.*/ |
| if (G_UNLIKELY ((GST_PAD_PAD_TEMPLATE (src) == NULL) |
| || (GST_PAD_PAD_TEMPLATE (sink) == NULL))) { |
| compatible = TRUE; |
| goto done; |
| } |
| srccaps = gst_caps_ref (GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (src))); |
| sinkcaps = |
| gst_caps_ref (GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (sink))); |
| } |
| |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, src, "src caps %" GST_PTR_FORMAT, |
| srccaps); |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, sink, "sink caps %" GST_PTR_FORMAT, |
| sinkcaps); |
| |
| /* if we have caps on both pads we can check the intersection. If one |
| * of the caps is NULL, we return TRUE. */ |
| if (G_UNLIKELY (srccaps == NULL || sinkcaps == NULL)) { |
| if (srccaps) |
| gst_caps_unref (srccaps); |
| if (sinkcaps) |
| gst_caps_unref (sinkcaps); |
| goto done; |
| } |
| |
| compatible = gst_caps_can_intersect (srccaps, sinkcaps); |
| gst_caps_unref (srccaps); |
| gst_caps_unref (sinkcaps); |
| |
| done: |
| GST_CAT_DEBUG (GST_CAT_CAPS, "caps are %scompatible", |
| (compatible ? "" : "not")); |
| |
| return compatible; |
| } |
| |
| /* check if the grandparents of both pads are the same. |
| * This check is required so that we don't try to link |
| * pads from elements in different bins without ghostpads. |
| * |
| * The LOCK should be held on both pads |
| */ |
| static gboolean |
| gst_pad_link_check_hierarchy (GstPad * src, GstPad * sink) |
| { |
| GstObject *psrc, *psink; |
| |
| psrc = GST_OBJECT_PARENT (src); |
| psink = GST_OBJECT_PARENT (sink); |
| |
| /* if one of the pads has no parent, we allow the link */ |
| if (G_UNLIKELY (psrc == NULL || psink == NULL)) |
| goto no_parent; |
| |
| /* only care about parents that are elements */ |
| if (G_UNLIKELY (!GST_IS_ELEMENT (psrc) || !GST_IS_ELEMENT (psink))) |
| goto no_element_parent; |
| |
| /* if the parents are the same, we have a loop */ |
| if (G_UNLIKELY (psrc == psink)) |
| goto same_parents; |
| |
| /* if they both have a parent, we check the grandparents. We can not lock |
| * the parent because we hold on the child (pad) and the locking order is |
| * parent >> child. */ |
| psrc = GST_OBJECT_PARENT (psrc); |
| psink = GST_OBJECT_PARENT (psink); |
| |
| /* if they have grandparents but they are not the same */ |
| if (G_UNLIKELY (psrc != psink)) |
| goto wrong_grandparents; |
| |
| return TRUE; |
| |
| /* ERRORS */ |
| no_parent: |
| { |
| GST_CAT_DEBUG (GST_CAT_CAPS, |
| "one of the pads has no parent %" GST_PTR_FORMAT " and %" |
| GST_PTR_FORMAT, psrc, psink); |
| return TRUE; |
| } |
| no_element_parent: |
| { |
| GST_CAT_DEBUG (GST_CAT_CAPS, |
| "one of the pads has no element parent %" GST_PTR_FORMAT " and %" |
| GST_PTR_FORMAT, psrc, psink); |
| return TRUE; |
| } |
| same_parents: |
| { |
| GST_CAT_DEBUG (GST_CAT_CAPS, "pads have same parent %" GST_PTR_FORMAT, |
| psrc); |
| return FALSE; |
| } |
| wrong_grandparents: |
| { |
| GST_CAT_DEBUG (GST_CAT_CAPS, |
| "pads have different grandparents %" GST_PTR_FORMAT " and %" |
| GST_PTR_FORMAT, psrc, psink); |
| return FALSE; |
| } |
| } |
| |
| /* FIXME leftover from an attempt at refactoring... */ |
| /* call with the two pads unlocked, when this function returns GST_PAD_LINK_OK, |
| * the two pads will be locked in the srcpad, sinkpad order. */ |
| static GstPadLinkReturn |
| gst_pad_link_prepare (GstPad * srcpad, GstPad * sinkpad, GstPadLinkCheck flags) |
| { |
| GST_CAT_INFO (GST_CAT_PADS, "trying to link %s:%s and %s:%s", |
| GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad)); |
| |
| GST_OBJECT_LOCK (srcpad); |
| |
| if (G_UNLIKELY (GST_PAD_PEER (srcpad) != NULL)) |
| goto src_was_linked; |
| |
| GST_OBJECT_LOCK (sinkpad); |
| |
| if (G_UNLIKELY (GST_PAD_PEER (sinkpad) != NULL)) |
| goto sink_was_linked; |
| |
| /* check hierarchy, pads can only be linked if the grandparents |
| * are the same. */ |
| if ((flags & GST_PAD_LINK_CHECK_HIERARCHY) |
| && !gst_pad_link_check_hierarchy (srcpad, sinkpad)) |
| goto wrong_hierarchy; |
| |
| /* check pad caps for non-empty intersection */ |
| if (!gst_pad_link_check_compatible_unlocked (srcpad, sinkpad, flags)) |
| goto no_format; |
| |
| /* FIXME check pad scheduling for non-empty intersection */ |
| |
| return GST_PAD_LINK_OK; |
| |
| src_was_linked: |
| { |
| GST_CAT_INFO (GST_CAT_PADS, "src %s:%s was already linked to %s:%s", |
| GST_DEBUG_PAD_NAME (srcpad), |
| GST_DEBUG_PAD_NAME (GST_PAD_PEER (srcpad))); |
| /* we do not emit a warning in this case because unlinking cannot |
| * be made MT safe.*/ |
| GST_OBJECT_UNLOCK (srcpad); |
| return GST_PAD_LINK_WAS_LINKED; |
| } |
| sink_was_linked: |
| { |
| GST_CAT_INFO (GST_CAT_PADS, "sink %s:%s was already linked to %s:%s", |
| GST_DEBUG_PAD_NAME (sinkpad), |
| GST_DEBUG_PAD_NAME (GST_PAD_PEER (sinkpad))); |
| /* we do not emit a warning in this case because unlinking cannot |
| * be made MT safe.*/ |
| GST_OBJECT_UNLOCK (sinkpad); |
| GST_OBJECT_UNLOCK (srcpad); |
| return GST_PAD_LINK_WAS_LINKED; |
| } |
| wrong_hierarchy: |
| { |
| GST_CAT_INFO (GST_CAT_PADS, "pads have wrong hierarchy"); |
| GST_OBJECT_UNLOCK (sinkpad); |
| GST_OBJECT_UNLOCK (srcpad); |
| return GST_PAD_LINK_WRONG_HIERARCHY; |
| } |
| no_format: |
| { |
| GST_CAT_INFO (GST_CAT_PADS, "caps are incompatible"); |
| GST_OBJECT_UNLOCK (sinkpad); |
| GST_OBJECT_UNLOCK (srcpad); |
| return GST_PAD_LINK_NOFORMAT; |
| } |
| } |
| |
| /** |
| * gst_pad_can_link: |
| * @srcpad: the source #GstPad. |
| * @sinkpad: the sink #GstPad. |
| * |
| * Checks if the source pad and the sink pad are compatible so they can be |
| * linked. |
| * |
| * Returns: TRUE if the pads can be linked. |
| */ |
| gboolean |
| gst_pad_can_link (GstPad * srcpad, GstPad * sinkpad) |
| { |
| GstPadLinkReturn result; |
| |
| /* generic checks */ |
| g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE); |
| g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE); |
| |
| GST_CAT_INFO (GST_CAT_PADS, "check if %s:%s can link with %s:%s", |
| GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad)); |
| |
| /* gst_pad_link_prepare does everything for us, we only release the locks |
| * on the pads that it gets us. If this function returns !OK the locks are not |
| * taken anymore. */ |
| result = gst_pad_link_prepare (srcpad, sinkpad, GST_PAD_LINK_CHECK_DEFAULT); |
| if (result != GST_PAD_LINK_OK) |
| goto done; |
| |
| GST_OBJECT_UNLOCK (srcpad); |
| GST_OBJECT_UNLOCK (sinkpad); |
| |
| done: |
| return result == GST_PAD_LINK_OK; |
| } |
| |
| /** |
| * gst_pad_link_full: |
| * @srcpad: the source #GstPad to link. |
| * @sinkpad: the sink #GstPad to link. |
| * @flags: the checks to validate when linking |
| * |
| * Links the source pad and the sink pad. |
| * |
| * This variant of #gst_pad_link provides a more granular control on the |
| * checks being done when linking. While providing some considerable speedups |
| * the caller of this method must be aware that wrong usage of those flags |
| * can cause severe issues. Refer to the documentation of #GstPadLinkCheck |
| * for more information. |
| * |
| * MT Safe. |
| * |
| * Returns: A result code indicating if the connection worked or |
| * what went wrong. |
| * |
| * Since: 0.10.30 |
| */ |
| GstPadLinkReturn |
| gst_pad_link_full (GstPad * srcpad, GstPad * sinkpad, GstPadLinkCheck flags) |
| { |
| GstPadLinkReturn result; |
| GstElement *parent; |
| GstPadLinkFunction srcfunc, sinkfunc; |
| |
| g_return_val_if_fail (GST_IS_PAD (srcpad), GST_PAD_LINK_REFUSED); |
| g_return_val_if_fail (GST_PAD_IS_SRC (srcpad), GST_PAD_LINK_WRONG_DIRECTION); |
| g_return_val_if_fail (GST_IS_PAD (sinkpad), GST_PAD_LINK_REFUSED); |
| g_return_val_if_fail (GST_PAD_IS_SINK (sinkpad), |
| GST_PAD_LINK_WRONG_DIRECTION); |
| |
| /* Notify the parent early. See gst_pad_unlink for details. */ |
| if (G_LIKELY ((parent = GST_ELEMENT_CAST (gst_pad_get_parent (srcpad))))) { |
| if (G_LIKELY (GST_IS_ELEMENT (parent))) { |
| gst_element_post_message (parent, |
| gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad), |
| GST_STRUCTURE_CHANGE_TYPE_PAD_LINK, parent, TRUE)); |
| } else { |
| gst_object_unref (parent); |
| parent = NULL; |
| } |
| } |
| |
| /* prepare will also lock the two pads */ |
| result = gst_pad_link_prepare (srcpad, sinkpad, flags); |
| |
| if (G_UNLIKELY (result != GST_PAD_LINK_OK)) |
| goto done; |
| |
| /* must set peers before calling the link function */ |
| GST_PAD_PEER (srcpad) = sinkpad; |
| GST_PAD_PEER (sinkpad) = srcpad; |
| |
| /* make sure we update events */ |
| prepare_event_update (srcpad, sinkpad); |
| |
| /* get the link functions */ |
| srcfunc = GST_PAD_LINKFUNC (srcpad); |
| sinkfunc = GST_PAD_LINKFUNC (sinkpad); |
| |
| if (G_UNLIKELY (srcfunc || sinkfunc)) { |
| /* custom link functions, execute them */ |
| GST_OBJECT_UNLOCK (sinkpad); |
| GST_OBJECT_UNLOCK (srcpad); |
| |
| if (srcfunc) { |
| /* this one will call the peer link function */ |
| result = srcfunc (srcpad, sinkpad); |
| } else if (sinkfunc) { |
| /* if no source link function, we need to call the sink link |
| * function ourselves. */ |
| result = sinkfunc (sinkpad, srcpad); |
| } |
| |
| GST_OBJECT_LOCK (srcpad); |
| GST_OBJECT_LOCK (sinkpad); |
| |
| /* we released the lock, check if the same pads are linked still */ |
| if (GST_PAD_PEER (srcpad) != sinkpad || GST_PAD_PEER (sinkpad) != srcpad) |
| goto concurrent_link; |
| |
| if (G_UNLIKELY (result != GST_PAD_LINK_OK)) |
| goto link_failed; |
| } |
| GST_OBJECT_UNLOCK (sinkpad); |
| GST_OBJECT_UNLOCK (srcpad); |
| |
| /* fire off a signal to each of the pads telling them |
| * that they've been linked */ |
| g_signal_emit (srcpad, gst_pad_signals[PAD_LINKED], 0, sinkpad); |
| g_signal_emit (sinkpad, gst_pad_signals[PAD_LINKED], 0, srcpad); |
| |
| GST_CAT_INFO (GST_CAT_PADS, "linked %s:%s and %s:%s, successful", |
| GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad)); |
| |
| gst_pad_send_event (srcpad, gst_event_new_reconfigure ()); |
| |
| done: |
| if (G_LIKELY (parent)) { |
| gst_element_post_message (parent, |
| gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad), |
| GST_STRUCTURE_CHANGE_TYPE_PAD_LINK, parent, FALSE)); |
| gst_object_unref (parent); |
| } |
| |
| return result; |
| |
| /* ERRORS */ |
| concurrent_link: |
| { |
| GST_CAT_INFO (GST_CAT_PADS, "concurrent link between %s:%s and %s:%s", |
| GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad)); |
| GST_OBJECT_UNLOCK (sinkpad); |
| GST_OBJECT_UNLOCK (srcpad); |
| |
| /* The other link operation succeeded first */ |
| result = GST_PAD_LINK_WAS_LINKED; |
| goto done; |
| } |
| link_failed: |
| { |
| GST_CAT_INFO (GST_CAT_PADS, "link between %s:%s and %s:%s failed", |
| GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad)); |
| |
| GST_PAD_PEER (srcpad) = NULL; |
| GST_PAD_PEER (sinkpad) = NULL; |
| |
| GST_OBJECT_UNLOCK (sinkpad); |
| GST_OBJECT_UNLOCK (srcpad); |
| |
| goto done; |
| } |
| } |
| |
| /** |
| * gst_pad_link: |
| * @srcpad: the source #GstPad to link. |
| * @sinkpad: the sink #GstPad to link. |
| * |
| * Links the source pad and the sink pad. |
| * |
| * Returns: A result code indicating if the connection worked or |
| * what went wrong. |
| * |
| * MT Safe. |
| */ |
| GstPadLinkReturn |
| gst_pad_link (GstPad * srcpad, GstPad * sinkpad) |
| { |
| return gst_pad_link_full (srcpad, sinkpad, GST_PAD_LINK_CHECK_DEFAULT); |
| } |
| |
| static void |
| gst_pad_set_pad_template (GstPad * pad, GstPadTemplate * templ) |
| { |
| GstPadTemplate **template_p; |
| |
| /* this function would need checks if it weren't static */ |
| |
| GST_OBJECT_LOCK (pad); |
| template_p = &pad->padtemplate; |
| gst_object_replace ((GstObject **) template_p, (GstObject *) templ); |
| GST_OBJECT_UNLOCK (pad); |
| |
| if (templ) |
| gst_pad_template_pad_created (templ, pad); |
| } |
| |
| /** |
| * gst_pad_get_pad_template: |
| * @pad: a #GstPad. |
| * |
| * Gets the template for @pad. |
| * |
| * Returns: (transfer full): the #GstPadTemplate from which this pad was |
| * instantiated, or %NULL if this pad has no template. Unref after |
| * usage. |
| */ |
| GstPadTemplate * |
| gst_pad_get_pad_template (GstPad * pad) |
| { |
| GstPadTemplate *templ; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), NULL); |
| |
| templ = GST_PAD_PAD_TEMPLATE (pad); |
| |
| return (templ ? gst_object_ref (templ) : NULL); |
| } |
| |
| static GstCaps * |
| caps_with_getcaps (GstPad * pad, GstCaps * filter) |
| { |
| GstCaps *result; |
| |
| if (GST_PAD_GETCAPSFUNC (pad) == NULL) |
| return NULL; |
| |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, |
| "dispatching to pad getcaps function with " |
| "filter %" GST_PTR_FORMAT, filter); |
| |
| GST_OBJECT_FLAG_SET (pad, GST_PAD_IN_GETCAPS); |
| GST_OBJECT_UNLOCK (pad); |
| result = GST_PAD_GETCAPSFUNC (pad) (pad, filter); |
| GST_OBJECT_LOCK (pad); |
| GST_OBJECT_FLAG_UNSET (pad, GST_PAD_IN_GETCAPS); |
| |
| if (G_UNLIKELY (result == NULL)) |
| goto null_caps; |
| |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, |
| "pad getcaps returned %" GST_PTR_FORMAT, result); |
| |
| #ifndef G_DISABLE_ASSERT |
| /* check that the returned caps are a real subset of the template caps */ |
| if (GST_PAD_PAD_TEMPLATE (pad)) { |
| const GstCaps *templ_caps = |
| GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (pad)); |
| if (!gst_caps_is_subset (result, templ_caps)) { |
| GstCaps *temp; |
| |
| GST_CAT_ERROR_OBJECT (GST_CAT_CAPS, pad, |
| "pad returned caps %" GST_PTR_FORMAT |
| " which are not a real subset of its template caps %" |
| GST_PTR_FORMAT, result, templ_caps); |
| g_warning |
| ("pad %s:%s returned caps which are not a real " |
| "subset of its template caps", GST_DEBUG_PAD_NAME (pad)); |
| temp = gst_caps_intersect (templ_caps, result); |
| gst_caps_unref (result); |
| result = temp; |
| } |
| } |
| if (filter) { |
| if (!gst_caps_is_subset (result, filter)) { |
| GstCaps *temp; |
| |
| GST_CAT_ERROR_OBJECT (GST_CAT_CAPS, pad, |
| "pad returned caps %" GST_PTR_FORMAT |
| " which are not a real subset of the filter caps %" |
| GST_PTR_FORMAT, result, filter); |
| g_warning ("pad %s:%s returned caps which are not a real " |
| "subset of the filter caps", GST_DEBUG_PAD_NAME (pad)); |
| /* FIXME: Order? But shouldn't happen anyway... */ |
| temp = gst_caps_intersect_full (filter, result, GST_CAPS_INTERSECT_FIRST); |
| gst_caps_unref (result); |
| result = temp; |
| } |
| } |
| #endif |
| |
| return result; |
| |
| /* ERRORS */ |
| null_caps: |
| { |
| g_critical ("pad %s:%s returned NULL caps from getcaps function", |
| GST_DEBUG_PAD_NAME (pad)); |
| return NULL; |
| } |
| } |
| |
| /* should be called with the pad LOCK held */ |
| /* refs the caps, so caller is responsible for getting it unreffed */ |
| static GstCaps * |
| gst_pad_get_caps_unlocked (GstPad * pad, GstCaps * filter) |
| { |
| GstCaps *result = NULL; |
| GstPadTemplate *templ; |
| gboolean fixed_caps; |
| |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "get pad caps"); |
| |
| fixed_caps = GST_PAD_IS_FIXED_CAPS (pad); |
| |
| if (fixed_caps) { |
| /* fixed caps, try the negotiated caps first */ |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "fixed pad caps: trying pad caps"); |
| if ((result = get_pad_caps (pad))) |
| goto filter_done; |
| } |
| |
| /* try the getcaps function next */ |
| if ((result = caps_with_getcaps (pad, filter))) |
| goto done; |
| |
| if ((templ = GST_PAD_PAD_TEMPLATE (pad))) { |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "trying pad template caps"); |
| if ((result = GST_PAD_TEMPLATE_CAPS (templ))) |
| goto filter_done; |
| } |
| |
| if (!fixed_caps) { |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, |
| "non-fixed pad caps: trying pad caps"); |
| /* non fixed caps, try the negotiated caps */ |
| if ((result = get_pad_caps (pad))) |
| goto filter_done; |
| } |
| |
| /* this almost never happens */ |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "pad has no caps"); |
| result = gst_caps_new_empty (); |
| goto done; |
| |
| filter_done: |
| /* run the filter on the result */ |
| if (filter) { |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, |
| "using caps %p %" GST_PTR_FORMAT " with filter %p %" |
| GST_PTR_FORMAT, result, result, filter, filter); |
| result = gst_caps_intersect_full (filter, result, GST_CAPS_INTERSECT_FIRST); |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "result %p %" GST_PTR_FORMAT, |
| result, result); |
| } else { |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, |
| "using caps %p %" GST_PTR_FORMAT, result, result); |
| result = gst_caps_ref (result); |
| } |
| done: |
| return result; |
| } |
| |
| /** |
| * gst_pad_has_current_caps: |
| * @pad: a #GstPad to check |
| * |
| * Check if @pad has caps set on it with a #GST_EVENT_CAPS event. |
| * |
| * Returns: TRUE when @pad has caps associated with it. |
| */ |
| gboolean |
| gst_pad_has_current_caps (GstPad * pad) |
| { |
| gboolean result; |
| GstCaps *caps; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| |
| GST_OBJECT_LOCK (pad); |
| caps = get_pad_caps (pad); |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, |
| "check current pad caps %" GST_PTR_FORMAT, caps); |
| result = (caps != NULL); |
| GST_OBJECT_UNLOCK (pad); |
| |
| return result; |
| } |
| |
| /** |
| * gst_pad_get_current_caps: |
| * @pad: a #GstPad to get the current capabilities of. |
| * |
| * Gets the capabilities currently configured on @pad with the last |
| * #GST_EVENT_CAPS event. |
| * |
| * Returns: the current caps of the pad with incremented ref-count. |
| */ |
| GstCaps * |
| gst_pad_get_current_caps (GstPad * pad) |
| { |
| GstCaps *result; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), NULL); |
| |
| GST_OBJECT_LOCK (pad); |
| if ((result = get_pad_caps (pad))) |
| gst_caps_ref (result); |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, |
| "get current pad caps %" GST_PTR_FORMAT, result); |
| GST_OBJECT_UNLOCK (pad); |
| |
| return result; |
| } |
| |
| /** |
| * gst_pad_get_caps: |
| * @pad: a #GstPad to get the capabilities of. |
| * @filter: suggested #GstCaps. |
| * |
| * Gets the capabilities this pad can produce or consume. |
| * Note that this method doesn't necessarily return the caps set by |
| * gst_pad_set_caps() - use gst_pad_get_current_caps() for that instead. |
| * gst_pad_get_caps returns all possible caps a pad can operate with, using |
| * the pad's get_caps function; |
| * this returns the pad template caps if not explicitly set. |
| * |
| * When called on sinkpads @filter contains the caps that |
| * upstream could produce in the order preferred by upstream. When |
| * called on srcpads @filter contains the caps accepted by |
| * downstream in the preffered order. @filter might be %NULL but |
| * if it is not %NULL the returned caps will be a subset of @filter. |
| * |
| * Note that this function does not return writable #GstCaps, use |
| * gst_caps_make_writable() before modifying the caps. |
| * |
| * Returns: the caps of the pad with incremented ref-count. |
| */ |
| GstCaps * |
| gst_pad_get_caps (GstPad * pad, GstCaps * filter) |
| { |
| GstCaps *result = NULL; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), NULL); |
| g_return_val_if_fail (filter == NULL || GST_IS_CAPS (filter), NULL); |
| |
| GST_OBJECT_LOCK (pad); |
| |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "get pad caps"); |
| |
| result = gst_pad_get_caps_unlocked (pad, filter); |
| |
| GST_OBJECT_UNLOCK (pad); |
| |
| return result; |
| } |
| |
| |
| /** |
| * gst_pad_peer_get_caps: |
| * @pad: a #GstPad to get the capabilities of. |
| * @filter: a #GstCaps filter. |
| * |
| * Gets the capabilities of the peer connected to this pad. Similar to |
| * gst_pad_get_caps(). |
| * |
| * When called on srcpads @filter contains the caps that |
| * upstream could produce in the order preferred by upstream. When |
| * called on sinkpads @filter contains the caps accepted by |
| * downstream in the preffered order. @filter might be %NULL but |
| * if it is not %NULL the returned caps will be a subset of @filter. |
| * |
| * Returns: the caps of the peer pad with incremented ref-count. This function |
| * returns %NULL when there is no peer pad. |
| */ |
| GstCaps * |
| gst_pad_peer_get_caps (GstPad * pad, GstCaps * filter) |
| { |
| GstPad *peerpad; |
| GstCaps *result = NULL; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), NULL); |
| g_return_val_if_fail (filter == NULL || GST_IS_CAPS (filter), NULL); |
| |
| GST_OBJECT_LOCK (pad); |
| |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "get peer caps"); |
| |
| peerpad = GST_PAD_PEER (pad); |
| if (G_UNLIKELY (peerpad == NULL)) |
| goto no_peer; |
| |
| gst_object_ref (peerpad); |
| GST_OBJECT_UNLOCK (pad); |
| |
| result = gst_pad_get_caps (peerpad, filter); |
| |
| gst_object_unref (peerpad); |
| |
| return result; |
| |
| no_peer: |
| { |
| GST_OBJECT_UNLOCK (pad); |
| return NULL; |
| } |
| } |
| |
| static void |
| gst_pad_fixate_caps_default (GstPad * pad, GstCaps * caps) |
| { |
| /* default fixation */ |
| gst_caps_fixate (caps); |
| } |
| |
| /** |
| * gst_pad_fixate_caps: |
| * @pad: a #GstPad to fixate |
| * @caps: the #GstCaps to fixate |
| * |
| * Fixate a caps on the given pad. Modifies the caps in place, so you should |
| * make sure that the caps are actually writable (see gst_caps_make_writable()). |
| */ |
| void |
| gst_pad_fixate_caps (GstPad * pad, GstCaps * caps) |
| { |
| GstPadFixateCapsFunction fixatefunc; |
| |
| g_return_if_fail (GST_IS_PAD (pad)); |
| g_return_if_fail (caps != NULL); |
| g_return_if_fail (!gst_caps_is_empty (caps)); |
| g_return_if_fail (!gst_caps_is_any (caps)); |
| |
| if (gst_caps_is_fixed (caps) || gst_caps_is_any (caps)) |
| return; |
| |
| g_return_if_fail (gst_caps_is_writable (caps)); |
| |
| if (G_LIKELY ((fixatefunc = GST_PAD_FIXATECAPSFUNC (pad)))) |
| fixatefunc (pad, caps); |
| } |
| |
| /* Default accept caps implementation just checks against |
| * against the allowed caps for the pad */ |
| static gboolean |
| gst_pad_acceptcaps_default (GstPad * pad, GstCaps * caps) |
| { |
| /* get the caps and see if it intersects to something not empty */ |
| GstCaps *allowed; |
| gboolean result = FALSE; |
| |
| GST_DEBUG_OBJECT (pad, "caps %" GST_PTR_FORMAT, caps); |
| |
| allowed = gst_pad_get_caps (pad, NULL); |
| if (!allowed) |
| goto nothing_allowed; |
| |
| GST_DEBUG_OBJECT (pad, "allowed caps %" GST_PTR_FORMAT, allowed); |
| |
| result = gst_caps_is_subset (caps, allowed); |
| |
| gst_caps_unref (allowed); |
| |
| return result; |
| |
| /* ERRORS */ |
| nothing_allowed: |
| { |
| GST_DEBUG_OBJECT (pad, "no caps allowed on the pad"); |
| return FALSE; |
| } |
| } |
| |
| /** |
| * gst_pad_accept_caps: |
| * @pad: a #GstPad to check |
| * @caps: a #GstCaps to check on the pad |
| * |
| * Check if the given pad accepts the caps. |
| * |
| * Returns: TRUE if the pad can accept the caps. |
| */ |
| gboolean |
| gst_pad_accept_caps (GstPad * pad, GstCaps * caps) |
| { |
| gboolean result; |
| GstPadAcceptCapsFunction acceptfunc; |
| #if 0 |
| GstCaps *existing = NULL; |
| #endif |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| |
| /* any pad can be unnegotiated */ |
| if (caps == NULL) |
| return TRUE; |
| |
| /* lock for checking the existing caps */ |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "accept caps of %p", caps); |
| #if 0 |
| GST_OBJECT_LOCK (pad); |
| /* The current caps on a pad are trivially acceptable */ |
| if (G_LIKELY ((existing = GST_PAD_CAPS (pad)))) { |
| if (caps == existing || gst_caps_is_equal (caps, existing)) |
| goto is_same_caps; |
| } |
| GST_OBJECT_UNLOCK (pad); |
| #endif |
| acceptfunc = GST_PAD_ACCEPTCAPSFUNC (pad); |
| |
| /* Only null if the element explicitly unset it */ |
| if (G_UNLIKELY (acceptfunc == NULL)) |
| goto no_func; |
| |
| /* we can call the function */ |
| result = acceptfunc (pad, caps); |
| GST_DEBUG_OBJECT (pad, "acceptfunc returned %d", result); |
| |
| return result; |
| |
| #if 0 |
| is_same_caps: |
| { |
| GST_DEBUG_OBJECT (pad, "pad had same caps"); |
| GST_OBJECT_UNLOCK (pad); |
| return TRUE; |
| } |
| #endif |
| no_func: |
| { |
| GST_DEBUG_OBJECT (pad, "no acceptcaps function"); |
| return FALSE; |
| } |
| } |
| |
| /** |
| * gst_pad_peer_accept_caps: |
| * @pad: a #GstPad to check the peer of |
| * @caps: a #GstCaps to check on the pad |
| * |
| * Check if the peer of @pad accepts @caps. If @pad has no peer, this function |
| * returns TRUE. |
| * |
| * Returns: TRUE if the peer of @pad can accept the caps or @pad has no peer. |
| */ |
| gboolean |
| gst_pad_peer_accept_caps (GstPad * pad, GstCaps * caps) |
| { |
| GstPad *peerpad; |
| gboolean result; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| |
| GST_OBJECT_LOCK (pad); |
| |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "peer accept caps of (%p)", pad); |
| |
| peerpad = GST_PAD_PEER (pad); |
| if (G_UNLIKELY (peerpad == NULL)) |
| goto no_peer; |
| |
| gst_object_ref (peerpad); |
| /* release lock before calling external methods but keep ref to pad */ |
| GST_OBJECT_UNLOCK (pad); |
| |
| result = gst_pad_accept_caps (peerpad, caps); |
| |
| gst_object_unref (peerpad); |
| |
| return result; |
| |
| no_peer: |
| { |
| GST_OBJECT_UNLOCK (pad); |
| return TRUE; |
| } |
| } |
| |
| /** |
| * gst_pad_set_caps: |
| * @pad: a #GstPad to set the capabilities of. |
| * @caps: (transfer none): a #GstCaps to set. |
| * |
| * Sets the capabilities of this pad. The caps must be fixed. Any previous |
| * caps on the pad will be unreffed. This function refs the caps so you should |
| * unref if as soon as you don't need it anymore. |
| * It is possible to set NULL caps, which will make the pad unnegotiated |
| * again. |
| * |
| * Returns: TRUE if the caps could be set. FALSE if the caps were not fixed |
| * or bad parameters were provided to this function. |
| * |
| * MT safe. |
| */ |
| gboolean |
| gst_pad_set_caps (GstPad * pad, GstCaps * caps) |
| { |
| GstEvent *event; |
| gboolean res = TRUE; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| g_return_val_if_fail (caps != NULL && gst_caps_is_fixed (caps), FALSE); |
| |
| event = gst_event_new_caps (caps); |
| |
| if (GST_PAD_IS_SRC (pad)) |
| res = gst_pad_push_event (pad, event); |
| else |
| res = gst_pad_send_event (pad, event); |
| |
| return res; |
| } |
| |
| static gboolean |
| do_event_function (GstPad * pad, GstEvent * event, |
| GstPadEventFunction eventfunc, gboolean * caps_notify) |
| { |
| gboolean result = TRUE, call_event = TRUE; |
| GstCaps *caps, *old, *templ; |
| |
| switch (GST_EVENT_TYPE (event)) { |
| case GST_EVENT_CAPS: |
| { |
| /* backwards compatibility mode for caps */ |
| gst_event_parse_caps (event, &caps); |
| |
| /* See if pad accepts the caps */ |
| templ = gst_pad_get_pad_template_caps (pad); |
| if (!gst_caps_is_subset (caps, templ)) |
| goto not_accepted; |
| |
| /* check if it changed */ |
| if ((old = gst_pad_get_current_caps (pad))) { |
| call_event = !gst_caps_is_equal (caps, old); |
| gst_caps_unref (old); |
| } |
| if (call_event) |
| *caps_notify = TRUE; |
| gst_caps_unref (templ); |
| break; |
| } |
| default: |
| break; |
| } |
| |
| if (call_event) { |
| GST_DEBUG_OBJECT (pad, "calling event function with event %p", event); |
| result = eventfunc (pad, event); |
| } else { |
| gst_event_unref (event); |
| } |
| return result; |
| |
| /* ERRORS */ |
| not_accepted: |
| { |
| gst_caps_unref (templ); |
| gst_event_unref (event); |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, |
| "caps %" GST_PTR_FORMAT " not accepted", caps); |
| return FALSE; |
| } |
| } |
| |
| /* function to send all pending events on the sinkpad to the event |
| * function and collect the results. This function should be called with |
| * the object lock. The object lock might be released by this function. |
| */ |
| static GstFlowReturn |
| gst_pad_update_events (GstPad * pad) |
| { |
| GstFlowReturn ret = GST_FLOW_OK; |
| guint i; |
| GstPadEventFunction eventfunc; |
| GstEvent *event; |
| gboolean caps_notify = FALSE; |
| |
| if (G_UNLIKELY ((eventfunc = GST_PAD_EVENTFUNC (pad)) == NULL)) |
| goto no_function; |
| |
| for (i = 0; i < GST_EVENT_MAX_STICKY; i++) { |
| gboolean res; |
| PadEvent *ev; |
| |
| ev = &pad->priv->events[i]; |
| |
| /* skip without pending event */ |
| if ((event = gst_event_steal (&ev->pending)) == NULL) |
| continue; |
| |
| gst_event_ref (event); |
| GST_OBJECT_UNLOCK (pad); |
| |
| res = do_event_function (pad, event, eventfunc, &caps_notify); |
| |
| /* things could have changed while we release the lock, check if we still |
| * are handling the same event, if we don't something changed and we have |
| * to try again. FIXME. we need a cookie here. FIXME, we also want to remove |
| * that lock eventually and then do the retry elsewhere. */ |
| |
| if (res) { |
| /* make the event active */ |
| gst_event_take (&ev->event, event); |
| |
| /* notify caps change when needed */ |
| if (caps_notify) { |
| g_object_notify_by_pspec ((GObject *) pad, pspec_caps); |
| caps_notify = FALSE; |
| } |
| } else { |
| gst_event_unref (event); |
| ret = GST_FLOW_ERROR; |
| } |
| GST_OBJECT_LOCK (pad); |
| } |
| /* when we get here all events were successfully updated. */ |
| return ret; |
| |
| /* ERRORS */ |
| no_function: |
| { |
| g_warning ("pad %s:%s has no event handler, file a bug.", |
| GST_DEBUG_PAD_NAME (pad)); |
| return GST_FLOW_NOT_SUPPORTED; |
| } |
| } |
| |
| /** |
| * gst_pad_get_pad_template_caps: |
| * @pad: a #GstPad to get the template capabilities from. |
| * |
| * Gets the capabilities for @pad's template. |
| * |
| * Returns: (transfer full): the #GstCaps of this pad template. |
| * Unref after usage. |
| */ |
| GstCaps * |
| gst_pad_get_pad_template_caps (GstPad * pad) |
| { |
| static GstStaticCaps anycaps = GST_STATIC_CAPS ("ANY"); |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), NULL); |
| |
| if (GST_PAD_PAD_TEMPLATE (pad)) |
| return gst_pad_template_get_caps (GST_PAD_PAD_TEMPLATE (pad)); |
| |
| return gst_static_caps_get (&anycaps); |
| } |
| |
| /** |
| * gst_pad_get_peer: |
| * @pad: a #GstPad to get the peer of. |
| * |
| * Gets the peer of @pad. This function refs the peer pad so |
| * you need to unref it after use. |
| * |
| * Returns: (transfer full): the peer #GstPad. Unref after usage. |
| * |
| * MT safe. |
| */ |
| GstPad * |
| gst_pad_get_peer (GstPad * pad) |
| { |
| GstPad *result; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), NULL); |
| |
| GST_OBJECT_LOCK (pad); |
| result = GST_PAD_PEER (pad); |
| if (result) |
| gst_object_ref (result); |
| GST_OBJECT_UNLOCK (pad); |
| |
| return result; |
| } |
| |
| /** |
| * gst_pad_get_allowed_caps: |
| * @pad: a #GstPad. |
| * |
| * Gets the capabilities of the allowed media types that can flow through |
| * @pad and its peer. |
| * |
| * The allowed capabilities is calculated as the intersection of the results of |
| * calling gst_pad_get_caps() on @pad and its peer. The caller owns a reference |
| * on the resulting caps. |
| * |
| * Returns: (transfer full): the allowed #GstCaps of the pad link. Unref the |
| * caps when you no longer need it. This function returns NULL when @pad |
| * has no peer. |
| * |
| * MT safe. |
| */ |
| GstCaps * |
| gst_pad_get_allowed_caps (GstPad * pad) |
| { |
| GstCaps *mycaps; |
| GstCaps *caps; |
| GstCaps *peercaps; |
| GstPad *peer; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), NULL); |
| |
| GST_OBJECT_LOCK (pad); |
| peer = GST_PAD_PEER (pad); |
| if (G_UNLIKELY (peer == NULL)) |
| goto no_peer; |
| |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PROPERTIES, pad, "getting allowed caps"); |
| |
| gst_object_ref (peer); |
| GST_OBJECT_UNLOCK (pad); |
| mycaps = gst_pad_get_caps (pad, NULL); |
| |
| peercaps = gst_pad_get_caps (peer, NULL); |
| gst_object_unref (peer); |
| |
| caps = gst_caps_intersect (mycaps, peercaps); |
| gst_caps_unref (peercaps); |
| gst_caps_unref (mycaps); |
| |
| GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "allowed caps %" GST_PTR_FORMAT, |
| caps); |
| |
| return caps; |
| |
| no_peer: |
| { |
| GST_CAT_DEBUG_OBJECT (GST_CAT_PROPERTIES, pad, "no peer"); |
| GST_OBJECT_UNLOCK (pad); |
| |
| return NULL; |
| } |
| } |
| |
| /** |
| * gst_pad_iterate_internal_links_default: |
| * @pad: the #GstPad to get the internal links of. |
| * |
| * Iterate the list of pads to which the given pad is linked to inside of |
| * the parent element. |
| * This is the default handler, and thus returns an iterator of all of the |
| * pads inside the parent element with opposite direction. |
| * |
| * The caller must free this iterator after use with gst_iterator_free(). |
| * |
| * Returns: a #GstIterator of #GstPad, or NULL if @pad has no parent. Unref each |
| * returned pad with gst_object_unref(). |
| * |
| * Since: 0.10.21 |
| */ |
| GstIterator * |
| gst_pad_iterate_internal_links_default (GstPad * pad) |
| { |
| GstIterator *res; |
| GList **padlist; |
| guint32 *cookie; |
| GMutex *lock; |
| gpointer owner; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), NULL); |
| |
| { |
| GstElement *parent; |
| |
| GST_OBJECT_LOCK (pad); |
| parent = GST_PAD_PARENT (pad); |
| if (!parent || !GST_IS_ELEMENT (parent)) |
| goto no_parent; |
| |
| gst_object_ref (parent); |
| GST_OBJECT_UNLOCK (pad); |
| |
| if (pad->direction == GST_PAD_SRC) |
| padlist = &parent->sinkpads; |
| else |
| padlist = &parent->srcpads; |
| |
| GST_DEBUG_OBJECT (pad, "Making iterator"); |
| |
| cookie = &parent->pads_cookie; |
| owner = parent; |
| lock = GST_OBJECT_GET_LOCK (parent); |
| } |
| |
| res = gst_iterator_new_list (GST_TYPE_PAD, |
| lock, cookie, padlist, (GObject *) owner, NULL); |
| |
| gst_object_unref (owner); |
| |
| return res; |
| |
| /* ERRORS */ |
| no_parent: |
| { |
| GST_OBJECT_UNLOCK (pad); |
| GST_DEBUG_OBJECT (pad, "no parent element"); |
| return NULL; |
| } |
| } |
| |
| /** |
| * gst_pad_iterate_internal_links: |
| * @pad: the GstPad to get the internal links of. |
| * |
| * Gets an iterator for the pads to which the given pad is linked to inside |
| * of the parent element. |
| * |
| * Each #GstPad element yielded by the iterator will have its refcount increased, |
| * so unref after use. |
| * |
| * Free-function: gst_iterator_free |
| * |
| * Returns: (transfer full): a new #GstIterator of #GstPad or %NULL when the |
| * pad does not have an iterator function configured. Use |
| * gst_iterator_free() after usage. |
| * |
| * Since: 0.10.21 |
| */ |
| GstIterator * |
| gst_pad_iterate_internal_links (GstPad * pad) |
| { |
| GstIterator *res = NULL; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), NULL); |
| |
| if (GST_PAD_ITERINTLINKFUNC (pad)) |
| res = GST_PAD_ITERINTLINKFUNC (pad) (pad); |
| |
| return res; |
| } |
| |
| /** |
| * gst_pad_forward: |
| * @pad: a #GstPad |
| * @forward: a #GstPadForwardFunction |
| * @user_data: user data passed to @forward |
| * |
| * Calls @forward for all internally linked pads of @pad. This function deals with |
| * dynamically changing internal pads and will make sure that the @forward |
| * function is only called once for each pad. |
| * |
| * When @forward returns TRUE, no further pads will be processed. |
| * |
| * Returns: TRUE if one of the dispatcher functions returned TRUE. |
| */ |
| gboolean |
| gst_pad_forward (GstPad * pad, GstPadForwardFunction forward, |
| gpointer user_data) |
| { |
| gboolean result = FALSE; |
| GstIterator *iter; |
| gboolean done = FALSE; |
| GValue item = { 0, }; |
| GList *pushed_pads = NULL; |
| |
| iter = gst_pad_iterate_internal_links (pad); |
| |
| if (!iter) |
| goto no_iter; |
| |
| while (!done) { |
| switch (gst_iterator_next (iter, &item)) { |
| case GST_ITERATOR_OK: |
| { |
| GstPad *intpad; |
| |
| intpad = g_value_get_object (&item); |
| |
| /* if already pushed, skip. FIXME, find something faster to tag pads */ |
| if (g_list_find (pushed_pads, intpad)) { |
| g_value_reset (&item); |
| break; |
| } |
| |
| GST_LOG_OBJECT (pad, "calling forward function on pad %s:%s", |
| GST_DEBUG_PAD_NAME (intpad)); |
| done = result = forward (intpad, user_data); |
| |
| pushed_pads = g_list_prepend (pushed_pads, intpad); |
| |
| g_value_reset (&item); |
| break; |
| } |
| case GST_ITERATOR_RESYNC: |
| /* We don't reset the result here because we don't push the event |
| * again on pads that got the event already and because we need |
| * to consider the result of the previous pushes */ |
| gst_iterator_resync (iter); |
| break; |
| case GST_ITERATOR_ERROR: |
| GST_ERROR_OBJECT (pad, "Could not iterate over internally linked pads"); |
| done = TRUE; |
| break; |
| case GST_ITERATOR_DONE: |
| done = TRUE; |
| break; |
| } |
| } |
| g_value_unset (&item); |
| gst_iterator_free (iter); |
| |
| g_list_free (pushed_pads); |
| |
| no_iter: |
| return result; |
| } |
| |
| typedef struct |
| { |
| GstEvent *event; |
| gboolean result; |
| gboolean dispatched; |
| } EventData; |
| |
| static gboolean |
| event_forward_func (GstPad * pad, EventData * data) |
| { |
| /* for each pad we send to, we should ref the event; it's up |
| * to downstream to unref again when handled. */ |
| GST_LOG_OBJECT (pad, "Reffing and pushing event %p (%s) to %s:%s", |
| data->event, GST_EVENT_TYPE_NAME (data->event), GST_DEBUG_PAD_NAME (pad)); |
| |
| data->result |= gst_pad_push_event (pad, gst_event_ref (data->event)); |
| |
| data->dispatched = TRUE; |
| |
| /* don't stop */ |
| return FALSE; |
| } |
| |
| /** |
| * gst_pad_event_default: |
| * @pad: a #GstPad to call the default event handler on. |
| * @event: (transfer full): the #GstEvent to handle. |
| * |
| * Invokes the default event handler for the given pad. |
| * |
| * The EOS event will pause the task associated with @pad before it is forwarded |
| * to all internally linked pads, |
| * |
| * The CAPS event will never be forwarded. |
| * |
| * The the event is sent to all pads internally linked to @pad. This function |
| * takes ownership of @event. |
| * |
| * Returns: TRUE if the event was sent successfully. |
| */ |
| gboolean |
| gst_pad_event_default (GstPad * pad, GstEvent * event) |
| { |
| gboolean result; |
| EventData data; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| g_return_val_if_fail (event != NULL, FALSE); |
| |
| GST_LOG_OBJECT (pad, "default event handler"); |
| |
| switch (GST_EVENT_TYPE (event)) { |
| case GST_EVENT_EOS: |
| { |
| GST_DEBUG_OBJECT (pad, "pausing task because of eos"); |
| gst_pad_pause_task (pad); |
| break; |
| } |
| default: |
| break; |
| } |
| |
| data.event = event; |
| data.dispatched = FALSE; |
| data.result = FALSE; |
| |
| gst_pad_forward (pad, (GstPadForwardFunction) event_forward_func, &data); |
| |
| /* for sinkpads without a parent element or without internal links, nothing |
| * will be dispatched but we still want to return TRUE. */ |
| if (data.dispatched) |
| result = data.result; |
| else |
| result = TRUE; |
| |
| gst_event_unref (event); |
| |
| return result; |
| } |
| |
| /** |
| * gst_pad_query: |
| * @pad: a #GstPad to invoke the default query on. |
| * @query: (transfer none): the #GstQuery to perform. |
| * |
| * Dispatches a query to a pad. The query should have been allocated by the |
| * caller via one of the type-specific allocation functions. The element that |
| * the pad belongs to is responsible for filling the query with an appropriate |
| * response, which should then be parsed with a type-specific query parsing |
| * function. |
| * |
| * Again, the caller is responsible for both the allocation and deallocation of |
| * the query structure. |
| * |
| * Please also note that some queries might need a running pipeline to work. |
| * |
| * Returns: TRUE if the query could be performed. |
| */ |
| gboolean |
| gst_pad_query (GstPad * pad, GstQuery * query) |
| { |
| gboolean res; |
| GstPadQueryFunction func; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| g_return_val_if_fail (GST_IS_QUERY (query), FALSE); |
| |
| GST_DEBUG_OBJECT (pad, "sending query %p (%s)", query, |
| GST_QUERY_TYPE_NAME (query)); |
| |
| if ((func = GST_PAD_QUERYFUNC (pad)) == NULL) |
| goto no_func; |
| |
| res = func (pad, query); |
| |
| GST_DEBUG_OBJECT (pad, "sent query %p (%s), result %d", query, |
| GST_QUERY_TYPE_NAME (query), res); |
| |
| return res; |
| |
| no_func: |
| { |
| GST_DEBUG_OBJECT (pad, "had no query function"); |
| return FALSE; |
| } |
| } |
| |
| /** |
| * gst_pad_peer_query: |
| * @pad: a #GstPad to invoke the peer query on. |
| * @query: (transfer none): the #GstQuery to perform. |
| * |
| * Performs gst_pad_query() on the peer of @pad. |
| * |
| * The caller is responsible for both the allocation and deallocation of |
| * the query structure. |
| * |
| * Returns: TRUE if the query could be performed. This function returns %FALSE |
| * if @pad has no peer. |
| * |
| * Since: 0.10.15 |
| */ |
| gboolean |
| gst_pad_peer_query (GstPad * pad, GstQuery * query) |
| { |
| GstPad *peerpad; |
| gboolean result; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| g_return_val_if_fail (GST_IS_QUERY (query), FALSE); |
| |
| GST_OBJECT_LOCK (pad); |
| |
| GST_DEBUG_OBJECT (pad, "peer query %p (%s)", query, |
| GST_QUERY_TYPE_NAME (query)); |
| |
| peerpad = GST_PAD_PEER (pad); |
| if (G_UNLIKELY (peerpad == NULL)) |
| goto no_peer; |
| |
| gst_object_ref (peerpad); |
| GST_OBJECT_UNLOCK (pad); |
| |
| result = gst_pad_query (peerpad, query); |
| |
| gst_object_unref (peerpad); |
| |
| return result; |
| |
| /* ERRORS */ |
| no_peer: |
| { |
| GST_WARNING_OBJECT (pad, "pad has no peer"); |
| GST_OBJECT_UNLOCK (pad); |
| return FALSE; |
| } |
| } |
| |
| /** |
| * gst_pad_query_default: |
| * @pad: a #GstPad to call the default query handler on. |
| * @query: (transfer none): the #GstQuery to handle. |
| * |
| * Invokes the default query handler for the given pad. |
| * The query is sent to all pads internally linked to @pad. Note that |
| * if there are many possible sink pads that are internally linked to |
| * @pad, only one will be sent the query. |
| * Multi-sinkpad elements should implement custom query handlers. |
| * |
| * Returns: TRUE if the query was performed successfully. |
| */ |
| gboolean |
| gst_pad_query_default (GstPad * pad, GstQuery * query) |
| { |
| gboolean forward = TRUE, ret = FALSE; |
| |
| switch (GST_QUERY_TYPE (query)) { |
| case GST_QUERY_SCHEDULING: |
| forward = FALSE; |
| break; |
| case GST_QUERY_POSITION: |
| case GST_QUERY_SEEKING: |
| case GST_QUERY_FORMATS: |
| case GST_QUERY_LATENCY: |
| case GST_QUERY_JITTER: |
| case GST_QUERY_RATE: |
| case GST_QUERY_CONVERT: |
| case GST_QUERY_ALLOCATION: |
| default: |
| break; |
| } |
| |
| if (forward) { |
| ret = gst_pad_forward |
| (pad, (GstPadForwardFunction) gst_pad_peer_query, query); |
| } |
| return ret; |
| } |
| |
| static void |
| probe_hook_marshal (GHook * hook, ProbeMarshall * data) |
| { |
| GstPad *pad = data->pad; |
| GstProbeType flags; |
| GstPadProbeCallback callback; |
| GstProbeReturn ret; |
| |
| /* if we have called this callback, do nothing */ |
| if (PROBE_COOKIE (hook) == data->cookie) |
| return; |
| |
| PROBE_COOKIE (hook) = data->cookie; |
| |
| flags = hook->flags >> G_HOOK_FLAG_USER_SHIFT; |
| |
| /* one of the data types */ |
| if ((flags & GST_PROBE_TYPE_DATA & data->mask) == 0) |
| return; |
| /* one of the scheduling types */ |
| if ((flags & GST_PROBE_TYPE_SCHEDULING & data->mask) == 0) |
| return; |
| /* all of the blocking types must match */ |
| if ((flags & GST_PROBE_TYPE_BLOCKING) != |
| (data->mask & GST_PROBE_TYPE_BLOCKING)) |
| return; |
| |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "hook %lu with flags 0x%08x matches", hook->hook_id, flags); |
| |
| callback = (GstPadProbeCallback) hook->func; |
| if (callback == NULL) |
| return; |
| |
| GST_OBJECT_UNLOCK (pad); |
| |
| ret = callback (pad, data->mask, data->type_data, hook->data); |
| |
| GST_OBJECT_LOCK (pad); |
| |
| switch (ret) { |
| case GST_PROBE_REMOVE: |
| /* remove the probe */ |
| GST_DEBUG_OBJECT (pad, "asked to remove hook"); |
| cleanup_hook (pad, hook); |
| break; |
| case GST_PROBE_DROP: |
| /* need to drop the data, make sure other probes don't get called |
| * anymore */ |
| GST_DEBUG_OBJECT (pad, "asked to drop item"); |
| data->mask = GST_PROBE_TYPE_INVALID; |
| data->ret = GST_PROBE_DROP; |
| break; |
| case GST_PROBE_PASS: |
| /* inform the pad block to let things pass */ |
| GST_DEBUG_OBJECT (pad, "asked to pass item"); |
| data->pass = TRUE; |
| break; |
| default: |
| GST_DEBUG_OBJECT (pad, "probe returned %d", ret); |
| break; |
| } |
| } |
| |
| #define PROBE(pad,mask,data,label) \ |
| G_STMT_START { \ |
| if (G_UNLIKELY (pad->num_probes)) { \ |
| ret = do_probe_callbacks (pad, mask, data); \ |
| if (G_UNLIKELY (ret != GST_FLOW_OK)) \ |
| goto label; \ |
| } \ |
| } G_STMT_END |
| |
| static GstFlowReturn |
| do_probe_callbacks (GstPad * pad, GstProbeType mask, gpointer type_data) |
| { |
| ProbeMarshall data; |
| guint cookie; |
| |
| data.pad = pad; |
| data.mask = mask; |
| data.type_data = type_data; |
| data.ret = GST_PROBE_OK; |
| data.pass = FALSE; |
| data.cookie = pad->priv->probe_cookie++; |
| |
| again: |
| cookie = pad->priv->probe_cookie; |
| |
| g_hook_list_marshal (&pad->probes, FALSE, |
| (GHookMarshaller) probe_hook_marshal, &data); |
| |
| /* if the list changed, call the new callbacks (they will not have their |
| * cookie set to data.cookie */ |
| if (cookie != pad->priv->probe_cookie) { |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "probe list changed, restarting"); |
| goto again; |
| } |
| |
| if (data.ret == GST_PROBE_DROP) |
| goto dropped; |
| |
| if (data.pass) |
| goto passed; |
| |
| if (mask & GST_PROBE_TYPE_BLOCK) { |
| while (GST_PAD_IS_BLOCKED (pad)) { |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "we are blocked %d times", pad->num_blocked); |
| |
| /* we might have released the lock */ |
| if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad))) |
| goto flushing; |
| |
| /* now we block the streaming thread. It can be unlocked when we |
| * deactivate the pad (which will also set the FLUSHING flag) or |
| * when the pad is unblocked. A flushing event will also unblock |
| * the pad after setting the FLUSHING flag. */ |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "Waiting to be unblocked or set flushing"); |
| GST_OBJECT_FLAG_SET (pad, GST_PAD_BLOCKING); |
| GST_PAD_BLOCK_WAIT (pad); |
| GST_OBJECT_FLAG_UNSET (pad, GST_PAD_BLOCKING); |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "We got unblocked"); |
| |
| if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad))) |
| goto flushing; |
| } |
| } |
| |
| return GST_FLOW_OK; |
| |
| /* ERRORS */ |
| flushing: |
| { |
| GST_DEBUG_OBJECT (pad, "pad is flushing"); |
| return GST_FLOW_WRONG_STATE; |
| } |
| dropped: |
| { |
| GST_DEBUG_OBJECT (pad, "data is dropped"); |
| return GST_FLOW_CUSTOM_SUCCESS; |
| } |
| passed: |
| { |
| GST_DEBUG_OBJECT (pad, "data is passed"); |
| return GST_FLOW_OK; |
| } |
| } |
| |
| /* pad offsets */ |
| |
| /** |
| * gst_pad_get_offset: |
| * @pad: a #GstPad |
| * |
| * Get the offset applied to the running time of @pad. @pad has to be a source |
| * pad. |
| * |
| * Returns: the offset. |
| */ |
| gint64 |
| gst_pad_get_offset (GstPad * pad) |
| { |
| gint64 result; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), 0); |
| |
| GST_OBJECT_LOCK (pad); |
| result = pad->offset; |
| GST_OBJECT_UNLOCK (pad); |
| |
| return result; |
| } |
| |
| /** |
| * gst_pad_set_offset: |
| * @pad: a #GstPad |
| * @offset: the offset |
| * |
| * Set the offset that will be applied to the running time of @pad. |
| */ |
| void |
| gst_pad_set_offset (GstPad * pad, gint64 offset) |
| { |
| guint idx; |
| GstPad *peer; |
| GstPad *tmp = NULL; |
| |
| g_return_if_fail (GST_IS_PAD (pad)); |
| |
| GST_OBJECT_LOCK (pad); |
| /* if nothing changed, do nothing */ |
| if (pad->offset == offset) |
| goto done; |
| |
| pad->offset = offset; |
| |
| /* if no peer, we just updated the offset */ |
| if ((peer = GST_PAD_PEER (pad)) == NULL) |
| goto done; |
| |
| /* switch pads around when dealing with a sinkpad */ |
| if (GST_PAD_IS_SINK (pad)) { |
| /* ref the peer so it doesn't go away when we release the lock */ |
| tmp = gst_object_ref (peer); |
| /* make sure we get the peer (the srcpad) */ |
| GST_OBJECT_UNLOCK (pad); |
| |
| /* swap pads */ |
| peer = pad; |
| pad = tmp; |
| |
| GST_OBJECT_LOCK (pad); |
| /* check if the pad didn't get relinked */ |
| if (GST_PAD_PEER (pad) != peer) |
| goto done; |
| |
| /* we can release the ref now */ |
| gst_object_unref (peer); |
| } |
| |
| /* the index of the segment event in the array */ |
| idx = GST_EVENT_STICKY_IDX_TYPE (GST_EVENT_SEGMENT); |
| |
| /* lock order is srcpad >> sinkpad */ |
| GST_OBJECT_LOCK (peer); |
| /* take the current segment event, adjust it and then place |
| * it on the sinkpad. events on the srcpad are always active. */ |
| if (replace_event (pad, peer, idx)) |
| GST_OBJECT_FLAG_SET (peer, GST_PAD_NEED_EVENTS); |
| |
| GST_OBJECT_UNLOCK (peer); |
| |
| done: |
| GST_OBJECT_UNLOCK (pad); |
| } |
| |
| |
| /********************************************************************** |
| * Data passing functions |
| */ |
| |
| /* this is the chain function that does not perform the additional argument |
| * checking for that little extra speed. |
| */ |
| static inline GstFlowReturn |
| gst_pad_chain_data_unchecked (GstPad * pad, GstProbeType type, void *data) |
| { |
| GstFlowReturn ret; |
| gboolean needs_events; |
| |
| GST_PAD_STREAM_LOCK (pad); |
| |
| GST_OBJECT_LOCK (pad); |
| if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad))) |
| goto flushing; |
| |
| needs_events = GST_PAD_NEEDS_EVENTS (pad); |
| if (G_UNLIKELY (needs_events)) { |
| GST_OBJECT_FLAG_UNSET (pad, GST_PAD_NEED_EVENTS); |
| |
| GST_DEBUG_OBJECT (pad, "need to update all events"); |
| ret = gst_pad_update_events (pad); |
| if (G_UNLIKELY (ret != GST_FLOW_OK)) |
| goto events_error; |
| } |
| |
| PROBE (pad, GST_PROBE_TYPE_PUSH | type, data, probe_stopped); |
| |
| GST_OBJECT_UNLOCK (pad); |
| |
| /* NOTE: we read the chainfunc unlocked. |
| * we cannot hold the lock for the pad so we might send |
| * the data to the wrong function. This is not really a |
| * problem since functions are assigned at creation time |
| * and don't change that often... */ |
| if (G_LIKELY (type & GST_PROBE_TYPE_BUFFER)) { |
| GstPadChainFunction chainfunc; |
| |
| if (G_UNLIKELY ((chainfunc = GST_PAD_CHAINFUNC (pad)) == NULL)) |
| goto no_function; |
| |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "calling chainfunction &%s with buffer %p, ts %" GST_TIME_FORMAT, |
| GST_DEBUG_FUNCPTR_NAME (chainfunc), |
| GST_BUFFER (data), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (data))); |
| |
| ret = chainfunc (pad, GST_BUFFER_CAST (data)); |
| |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "called chainfunction &%s with buffer %p, returned %s", |
| GST_DEBUG_FUNCPTR_NAME (chainfunc), data, gst_flow_get_name (ret)); |
| } else { |
| GstPadChainListFunction chainlistfunc; |
| |
| if (G_UNLIKELY ((chainlistfunc = GST_PAD_CHAINLISTFUNC (pad)) == NULL)) |
| goto no_function; |
| |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "calling chainlistfunction &%s", |
| GST_DEBUG_FUNCPTR_NAME (chainlistfunc)); |
| |
| ret = chainlistfunc (pad, GST_BUFFER_LIST_CAST (data)); |
| |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "called chainlistfunction &%s, returned %s", |
| GST_DEBUG_FUNCPTR_NAME (chainlistfunc), gst_flow_get_name (ret)); |
| } |
| |
| GST_PAD_STREAM_UNLOCK (pad); |
| |
| return ret; |
| |
| /* ERRORS */ |
| flushing: |
| { |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "chaining, but pad was flushing"); |
| GST_OBJECT_UNLOCK (pad); |
| GST_PAD_STREAM_UNLOCK (pad); |
| return GST_FLOW_WRONG_STATE; |
| } |
| events_error: |
| { |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "events were not accepted"); |
| GST_OBJECT_UNLOCK (pad); |
| GST_PAD_STREAM_UNLOCK (pad); |
| return ret; |
| } |
| probe_stopped: |
| { |
| GST_OBJECT_UNLOCK (pad); |
| GST_PAD_STREAM_UNLOCK (pad); |
| gst_mini_object_unref (GST_MINI_OBJECT_CAST (data)); |
| |
| switch (ret) { |
| case GST_FLOW_CUSTOM_SUCCESS: |
| GST_DEBUG_OBJECT (pad, "dropped buffer"); |
| ret = GST_FLOW_OK; |
| break; |
| default: |
| GST_DEBUG_OBJECT (pad, "en error occured %s", gst_flow_get_name (ret)); |
| break; |
| } |
| return ret; |
| } |
| no_function: |
| { |
| gst_mini_object_unref (GST_MINI_OBJECT_CAST (data)); |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "pushing, but not chainhandler"); |
| GST_ELEMENT_ERROR (GST_PAD_PARENT (pad), CORE, PAD, (NULL), |
| ("push on pad %s:%s but it has no chainfunction", |
| GST_DEBUG_PAD_NAME (pad))); |
| GST_PAD_STREAM_UNLOCK (pad); |
| return GST_FLOW_NOT_SUPPORTED; |
| } |
| } |
| |
| /** |
| * gst_pad_chain: |
| * @pad: a sink #GstPad, returns GST_FLOW_ERROR if not. |
| * @buffer: (transfer full): the #GstBuffer to send, return GST_FLOW_ERROR |
| * if not. |
| * |
| * Chain a buffer to @pad. |
| * |
| * The function returns #GST_FLOW_WRONG_STATE if the pad was flushing. |
| * |
| * If the buffer type is not acceptable for @pad (as negotiated with a |
| * preceeding GST_EVENT_CAPS event), this function returns |
| * #GST_FLOW_NOT_NEGOTIATED. |
| * |
| * The function proceeds calling the chain function installed on @pad (see |
| * gst_pad_set_chain_function()) and the return value of that function is |
| * returned to the caller. #GST_FLOW_NOT_SUPPORTED is returned if @pad has no |
| * chain function. |
| * |
| * In all cases, success or failure, the caller loses its reference to @buffer |
| * after calling this function. |
| * |
| * Returns: a #GstFlowReturn from the pad. |
| * |
| * MT safe. |
| */ |
| GstFlowReturn |
| gst_pad_chain (GstPad * pad, GstBuffer * buffer) |
| { |
| g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR); |
| g_return_val_if_fail (GST_PAD_IS_SINK (pad), GST_FLOW_ERROR); |
| g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR); |
| |
| return gst_pad_chain_data_unchecked (pad, GST_PROBE_TYPE_BUFFER, buffer); |
| } |
| |
| static GstFlowReturn |
| gst_pad_chain_list_default (GstPad * pad, GstBufferList * list) |
| { |
| guint i, len; |
| GstBuffer *buffer; |
| GstFlowReturn ret; |
| |
| GST_INFO_OBJECT (pad, "chaining each group in list as a merged buffer"); |
| |
| len = gst_buffer_list_len (list); |
| |
| ret = GST_FLOW_OK; |
| for (i = 0; i < len; i++) { |
| buffer = gst_buffer_list_get (list, i); |
| ret = |
| gst_pad_chain_data_unchecked (pad, GST_PROBE_TYPE_BUFFER, |
| gst_buffer_ref (buffer)); |
| if (ret != GST_FLOW_OK) |
| break; |
| } |
| gst_buffer_list_unref (list); |
| |
| return ret; |
| } |
| |
| /** |
| * gst_pad_chain_list: |
| * @pad: a sink #GstPad, returns GST_FLOW_ERROR if not. |
| * @list: (transfer full): the #GstBufferList to send, return GST_FLOW_ERROR |
| * if not. |
| * |
| * Chain a bufferlist to @pad. |
| * |
| * The function returns #GST_FLOW_WRONG_STATE if the pad was flushing. |
| * |
| * If @pad was not negotiated properly with a CAPS event, this function |
| * returns #GST_FLOW_NOT_NEGOTIATED. |
| * |
| * The function proceeds calling the chainlist function installed on @pad (see |
| * gst_pad_set_chain_list_function()) and the return value of that function is |
| * returned to the caller. #GST_FLOW_NOT_SUPPORTED is returned if @pad has no |
| * chainlist function. |
| * |
| * In all cases, success or failure, the caller loses its reference to @list |
| * after calling this function. |
| * |
| * MT safe. |
| * |
| * Returns: a #GstFlowReturn from the pad. |
| * |
| * Since: 0.10.24 |
| */ |
| GstFlowReturn |
| gst_pad_chain_list (GstPad * pad, GstBufferList * list) |
| { |
| g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR); |
| g_return_val_if_fail (GST_PAD_IS_SINK (pad), GST_FLOW_ERROR); |
| g_return_val_if_fail (GST_IS_BUFFER_LIST (list), GST_FLOW_ERROR); |
| |
| return gst_pad_chain_data_unchecked (pad, GST_PROBE_TYPE_BUFFER_LIST, list); |
| } |
| |
| static GstFlowReturn |
| gst_pad_push_data (GstPad * pad, GstProbeType type, void *data) |
| { |
| GstPad *peer; |
| GstFlowReturn ret; |
| |
| GST_OBJECT_LOCK (pad); |
| if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad))) |
| goto flushing; |
| |
| type |= GST_PROBE_TYPE_PUSH; |
| |
| /* do block probes */ |
| PROBE (pad, type | GST_PROBE_TYPE_BLOCK, data, probe_stopped); |
| |
| /* do post-blocking probes */ |
| PROBE (pad, type, data, probe_stopped); |
| |
| if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL)) |
| goto not_linked; |
| |
| /* take ref to peer pad before releasing the lock */ |
| gst_object_ref (peer); |
| pad->priv->using++; |
| GST_OBJECT_UNLOCK (pad); |
| |
| ret = gst_pad_chain_data_unchecked (peer, type, data); |
| |
| gst_object_unref (peer); |
| |
| GST_OBJECT_LOCK (pad); |
| pad->priv->using--; |
| if (pad->priv->using == 0) { |
| /* pad is not active anymore, trigger idle callbacks */ |
| PROBE (pad, GST_PROBE_TYPE_PUSH | GST_PROBE_TYPE_IDLE, NULL, probe_stopped); |
| } |
| GST_OBJECT_UNLOCK (pad); |
| |
| return ret; |
| |
| /* ERROR recovery here */ |
| /* ERRORS */ |
| flushing: |
| { |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "pushing, but pad was flushing"); |
| GST_OBJECT_UNLOCK (pad); |
| gst_mini_object_unref (GST_MINI_OBJECT_CAST (data)); |
| return GST_FLOW_WRONG_STATE; |
| } |
| probe_stopped: |
| { |
| GST_OBJECT_UNLOCK (pad); |
| gst_mini_object_unref (GST_MINI_OBJECT_CAST (data)); |
| |
| switch (ret) { |
| case GST_FLOW_CUSTOM_SUCCESS: |
| GST_DEBUG_OBJECT (pad, "dropped buffer"); |
| ret = GST_FLOW_OK; |
| break; |
| default: |
| GST_DEBUG_OBJECT (pad, "en error occured %s", gst_flow_get_name (ret)); |
| break; |
| } |
| return ret; |
| } |
| not_linked: |
| { |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "pushing, but it was not linked"); |
| GST_OBJECT_UNLOCK (pad); |
| gst_mini_object_unref (GST_MINI_OBJECT_CAST (data)); |
| return GST_FLOW_NOT_LINKED; |
| } |
| } |
| |
| /** |
| * gst_pad_push: |
| * @pad: a source #GstPad, returns #GST_FLOW_ERROR if not. |
| * @buffer: (transfer full): the #GstBuffer to push returns GST_FLOW_ERROR |
| * if not. |
| * |
| * Pushes a buffer to the peer of @pad. |
| * |
| * This function will call installed block probes before triggering any |
| * installed data probes. |
| * |
| * The function proceeds calling gst_pad_chain() on the peer pad and returns |
| * the value from that function. If @pad has no peer, #GST_FLOW_NOT_LINKED will |
| * be returned. |
| * |
| * In all cases, success or failure, the caller loses its reference to @buffer |
| * after calling this function. |
| * |
| * Returns: a #GstFlowReturn from the peer pad. |
| * |
| * MT safe. |
| */ |
| GstFlowReturn |
| gst_pad_push (GstPad * pad, GstBuffer * buffer) |
| { |
| g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR); |
| g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR); |
| g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR); |
| |
| return gst_pad_push_data (pad, GST_PROBE_TYPE_BUFFER, buffer); |
| } |
| |
| /** |
| * gst_pad_push_list: |
| * @pad: a source #GstPad, returns #GST_FLOW_ERROR if not. |
| * @list: (transfer full): the #GstBufferList to push returns GST_FLOW_ERROR |
| * if not. |
| * |
| * Pushes a buffer list to the peer of @pad. |
| * |
| * This function will call installed block probes before triggering any |
| * installed data probes. |
| * |
| * The function proceeds calling the chain function on the peer pad and returns |
| * the value from that function. If @pad has no peer, #GST_FLOW_NOT_LINKED will |
| * be returned. If the peer pad does not have any installed chainlist function |
| * every group buffer of the list will be merged into a normal #GstBuffer and |
| * chained via gst_pad_chain(). |
| * |
| * In all cases, success or failure, the caller loses its reference to @list |
| * after calling this function. |
| * |
| * Returns: a #GstFlowReturn from the peer pad. |
| * |
| * MT safe. |
| * |
| * Since: 0.10.24 |
| */ |
| GstFlowReturn |
| gst_pad_push_list (GstPad * pad, GstBufferList * list) |
| { |
| g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR); |
| g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR); |
| g_return_val_if_fail (GST_IS_BUFFER_LIST (list), GST_FLOW_ERROR); |
| |
| return gst_pad_push_data (pad, GST_PROBE_TYPE_BUFFER_LIST, list); |
| } |
| |
| static GstFlowReturn |
| gst_pad_get_range_unchecked (GstPad * pad, guint64 offset, guint size, |
| GstBuffer ** buffer) |
| { |
| GstFlowReturn ret; |
| GstPadGetRangeFunction getrangefunc; |
| |
| GST_PAD_STREAM_LOCK (pad); |
| |
| GST_OBJECT_LOCK (pad); |
| if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad))) |
| goto flushing; |
| GST_OBJECT_UNLOCK (pad); |
| |
| if (G_UNLIKELY ((getrangefunc = GST_PAD_GETRANGEFUNC (pad)) == NULL)) |
| goto no_function; |
| |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "calling getrangefunc %s, offset %" |
| G_GUINT64_FORMAT ", size %u", |
| GST_DEBUG_FUNCPTR_NAME (getrangefunc), offset, size); |
| |
| ret = getrangefunc (pad, offset, size, buffer); |
| |
| if (G_UNLIKELY (ret != GST_FLOW_OK)) |
| goto get_range_failed; |
| |
| /* can only fire the signal if we have a valid buffer */ |
| GST_OBJECT_LOCK (pad); |
| PROBE (pad, GST_PROBE_TYPE_PULL | GST_PROBE_TYPE_BUFFER, *buffer, |
| probe_stopped); |
| GST_OBJECT_UNLOCK (pad); |
| |
| GST_PAD_STREAM_UNLOCK (pad); |
| |
| return ret; |
| |
| /* ERRORS */ |
| flushing: |
| { |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "getrange, but pad was flushing"); |
| GST_OBJECT_UNLOCK (pad); |
| GST_PAD_STREAM_UNLOCK (pad); |
| return GST_FLOW_WRONG_STATE; |
| } |
| no_function: |
| { |
| GST_ELEMENT_ERROR (GST_PAD_PARENT (pad), CORE, PAD, (NULL), |
| ("getrange on pad %s:%s but it has no getrangefunction", |
| GST_DEBUG_PAD_NAME (pad))); |
| GST_PAD_STREAM_UNLOCK (pad); |
| return GST_FLOW_NOT_SUPPORTED; |
| } |
| probe_stopped: |
| { |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "probe returned %s", gst_flow_get_name (ret)); |
| GST_OBJECT_UNLOCK (pad); |
| GST_PAD_STREAM_UNLOCK (pad); |
| gst_buffer_unref (*buffer); |
| *buffer = NULL; |
| return ret; |
| } |
| get_range_failed: |
| { |
| GST_PAD_STREAM_UNLOCK (pad); |
| *buffer = NULL; |
| GST_CAT_LEVEL_LOG (GST_CAT_SCHEDULING, |
| (ret >= GST_FLOW_UNEXPECTED) ? GST_LEVEL_INFO : GST_LEVEL_WARNING, |
| pad, "getrange failed, flow: %s", gst_flow_get_name (ret)); |
| return ret; |
| } |
| } |
| |
| /** |
| * gst_pad_get_range: |
| * @pad: a src #GstPad, returns #GST_FLOW_ERROR if not. |
| * @offset: The start offset of the buffer |
| * @size: The length of the buffer |
| * @buffer: (out callee-allocates): a pointer to hold the #GstBuffer, |
| * returns #GST_FLOW_ERROR if %NULL. |
| * |
| * When @pad is flushing this function returns #GST_FLOW_WRONG_STATE |
| * immediately and @buffer is %NULL. |
| * |
| * Calls the getrange function of @pad, see #GstPadGetRangeFunction for a |
| * description of a getrange function. If @pad has no getrange function |
| * installed (see gst_pad_set_getrange_function()) this function returns |
| * #GST_FLOW_NOT_SUPPORTED. |
| * |
| * This is a lowlevel function. Usualy gst_pad_pull_range() is used. |
| * |
| * Returns: a #GstFlowReturn from the pad. |
| * |
| * MT safe. |
| */ |
| GstFlowReturn |
| gst_pad_get_range (GstPad * pad, guint64 offset, guint size, |
| GstBuffer ** buffer) |
| { |
| g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR); |
| g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR); |
| g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR); |
| |
| return gst_pad_get_range_unchecked (pad, offset, size, buffer); |
| } |
| |
| /** |
| * gst_pad_pull_range: |
| * @pad: a sink #GstPad, returns GST_FLOW_ERROR if not. |
| * @offset: The start offset of the buffer |
| * @size: The length of the buffer |
| * @buffer: (out callee-allocates): a pointer to hold the #GstBuffer, returns |
| * GST_FLOW_ERROR if %NULL. |
| * |
| * Pulls a @buffer from the peer pad. |
| * |
| * This function will first trigger the pad block signal if it was |
| * installed. |
| * |
| * When @pad is not linked #GST_FLOW_NOT_LINKED is returned else this |
| * function returns the result of gst_pad_get_range() on the peer pad. |
| * See gst_pad_get_range() for a list of return values and for the |
| * semantics of the arguments of this function. |
| * |
| * Returns: a #GstFlowReturn from the peer pad. |
| * When this function returns #GST_FLOW_OK, @buffer will contain a valid |
| * #GstBuffer that should be freed with gst_buffer_unref() after usage. |
| * @buffer may not be used or freed when any other return value than |
| * #GST_FLOW_OK is returned. |
| * |
| * MT safe. |
| */ |
| GstFlowReturn |
| gst_pad_pull_range (GstPad * pad, guint64 offset, guint size, |
| GstBuffer ** buffer) |
| { |
| GstPad *peer; |
| GstFlowReturn ret; |
| gboolean needs_events; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR); |
| g_return_val_if_fail (GST_PAD_IS_SINK (pad), GST_FLOW_ERROR); |
| g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR); |
| |
| GST_OBJECT_LOCK (pad); |
| if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad))) |
| goto flushing; |
| |
| PROBE (pad, GST_PROBE_TYPE_PULL | GST_PROBE_TYPE_BLOCK, NULL, |
| pre_probe_stopped); |
| |
| if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL)) |
| goto not_linked; |
| |
| gst_object_ref (peer); |
| pad->priv->using++; |
| GST_OBJECT_UNLOCK (pad); |
| |
| ret = gst_pad_get_range_unchecked (peer, offset, size, buffer); |
| |
| gst_object_unref (peer); |
| |
| GST_OBJECT_LOCK (pad); |
| pad->priv->using--; |
| if (pad->priv->using == 0) { |
| /* pad is not active anymore, trigger idle callbacks */ |
| PROBE (pad, GST_PROBE_TYPE_PULL | GST_PROBE_TYPE_IDLE, NULL, |
| post_probe_stopped); |
| } |
| |
| if (G_UNLIKELY (ret != GST_FLOW_OK)) |
| goto pull_range_failed; |
| |
| PROBE (pad, GST_PROBE_TYPE_PULL | GST_PROBE_TYPE_BUFFER, buffer, |
| post_probe_stopped); |
| |
| needs_events = GST_PAD_NEEDS_EVENTS (pad); |
| if (G_UNLIKELY (needs_events)) { |
| GST_OBJECT_FLAG_UNSET (pad, GST_PAD_NEED_EVENTS); |
| |
| GST_DEBUG_OBJECT (pad, "we need to update the events"); |
| ret = gst_pad_update_events (pad); |
| if (G_UNLIKELY (ret != GST_FLOW_OK)) |
| goto events_error; |
| } |
| GST_OBJECT_UNLOCK (pad); |
| |
| return ret; |
| |
| /* ERROR recovery here */ |
| flushing: |
| { |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "pullrange, but pad was flushing"); |
| GST_OBJECT_UNLOCK (pad); |
| return GST_FLOW_WRONG_STATE; |
| } |
| pre_probe_stopped: |
| { |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "pre probe returned %s", |
| gst_flow_get_name (ret)); |
| GST_OBJECT_UNLOCK (pad); |
| return ret; |
| } |
| not_linked: |
| { |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "pulling range, but it was not linked"); |
| GST_OBJECT_UNLOCK (pad); |
| return GST_FLOW_NOT_LINKED; |
| } |
| pull_range_failed: |
| { |
| *buffer = NULL; |
| GST_OBJECT_UNLOCK (pad); |
| GST_CAT_LEVEL_LOG (GST_CAT_SCHEDULING, |
| (ret >= GST_FLOW_UNEXPECTED) ? GST_LEVEL_INFO : GST_LEVEL_WARNING, |
| pad, "pullrange failed, flow: %s", gst_flow_get_name (ret)); |
| return ret; |
| } |
| post_probe_stopped: |
| { |
| GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, |
| "post probe returned %s", gst_flow_get_name (ret)); |
| GST_OBJECT_UNLOCK (pad); |
| if (ret == GST_FLOW_OK) |
| gst_buffer_unref (*buffer); |
| *buffer = NULL; |
| return ret; |
| } |
| events_error: |
| { |
| GST_OBJECT_UNLOCK (pad); |
| gst_buffer_unref (*buffer); |
| *buffer = NULL; |
| GST_CAT_WARNING_OBJECT (GST_CAT_SCHEDULING, pad, |
| "pullrange returned events that were not accepted"); |
| return ret; |
| } |
| } |
| |
| /** |
| * gst_pad_push_event: |
| * @pad: a #GstPad to push the event to. |
| * @event: (transfer full): the #GstEvent to send to the pad. |
| * |
| * Sends the event to the peer of the given pad. This function is |
| * mainly used by elements to send events to their peer |
| * elements. |
| * |
| * This function takes owership of the provided event so you should |
| * gst_event_ref() it if you want to reuse the event after this call. |
| * |
| * Returns: TRUE if the event was handled. |
| * |
| * MT safe. |
| */ |
| gboolean |
| gst_pad_push_event (GstPad * pad, GstEvent * event) |
| { |
| GstFlowReturn ret; |
| GstPad *peerpad; |
| gboolean result; |
| gboolean stored = FALSE; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| g_return_val_if_fail (event != NULL, FALSE); |
| g_return_val_if_fail (GST_IS_EVENT (event), FALSE); |
| |
| GST_OBJECT_LOCK (pad); |
| |
| peerpad = GST_PAD_PEER (pad); |
| |
| /* Two checks to be made: |
| * . (un)set the FLUSHING flag for flushing events, |
| * . handle pad blocking */ |
| switch (GST_EVENT_TYPE (event)) { |
| case GST_EVENT_FLUSH_START: |
| GST_PAD_SET_FLUSHING (pad); |
| |
| if (G_UNLIKELY (GST_PAD_IS_BLOCKED (pad))) { |
| /* flush start will have set the FLUSHING flag and will then |
| * unlock all threads doing a GCond wait on the blocking pad. This |
| * will typically unblock the STREAMING thread blocked on a pad. */ |
| GST_LOG_OBJECT (pad, "Pad is blocked, not forwarding flush-start, " |
| "doing block signal."); |
| GST_PAD_BLOCK_BROADCAST (pad); |
| goto flushed; |
| } |
| break; |
| case GST_EVENT_FLUSH_STOP: |
| GST_PAD_UNSET_FLUSHING (pad); |
| if (G_UNLIKELY (GST_PAD_IS_BLOCKED (pad))) { |
| GST_LOG_OBJECT (pad, "Pad is blocked, not forwarding flush-stop"); |
| goto flushed; |
| } |
| break; |
| default: |
| { |
| /* store the event on the pad, but only on srcpads */ |
| if (GST_PAD_IS_SRC (pad) && GST_EVENT_IS_STICKY (event)) { |
| guint idx; |
| |
| idx = GST_EVENT_STICKY_IDX (event); |
| GST_LOG_OBJECT (pad, "storing sticky event %s at index %u", |
| GST_EVENT_TYPE_NAME (event), idx); |
| |
| /* srcpad sticky events always become active immediately */ |
| gst_event_replace (&pad->priv->events[idx].event, event); |
| |
| stored = TRUE; |
| } |
| |
| /* backwards compatibility mode for caps */ |
| switch (GST_EVENT_TYPE (event)) { |
| case GST_EVENT_CAPS: |
| { |
| GST_OBJECT_UNLOCK (pad); |
| |
| g_object_notify_by_pspec ((GObject *) pad, pspec_caps); |
| |
| GST_OBJECT_LOCK (pad); |
| /* the peerpad might have changed. Things we checked above could not |
| * have changed. */ |
| peerpad = GST_PAD_PEER (pad); |
| break; |
| } |
| case GST_EVENT_SEGMENT: |
| { |
| gint64 offset; |
| |
| offset = pad->offset; |
| /* check if we need to adjust the segment */ |
| if (offset != 0 && (peerpad != NULL)) { |
| GstSegment segment; |
| |
| /* copy segment values */ |
| gst_event_copy_segment (event, &segment); |
| gst_event_unref (event); |
| |
| /* adjust and make a new event with the offset applied */ |
| segment.base += offset; |
| event = gst_event_new_segment (&segment); |
| } |
| break; |
| } |
| case GST_EVENT_RECONFIGURE: |
| if (GST_PAD_IS_SINK (pad)) |
| GST_OBJECT_FLAG_SET (pad, GST_PAD_NEED_RECONFIGURE); |
| break; |
| default: |
| break; |
| } |
| |
| if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad))) |
| goto flushed; |
| |
| PROBE (pad, GST_PROBE_TYPE_PUSH | GST_PROBE_TYPE_EVENT |
| | GST_PROBE_TYPE_BLOCK, event, probe_stopped); |
| |
| break; |
| } |
| } |
| |
| /* send probes after modifying the events above */ |
| PROBE (pad, GST_PROBE_TYPE_PUSH | GST_PROBE_TYPE_EVENT, event, probe_stopped); |
| |
| /* now check the peer pad */ |
| if (peerpad == NULL) |
| goto not_linked; |
| |
| gst_object_ref (peerpad); |
| pad->priv->using++; |
| GST_OBJECT_UNLOCK (pad); |
| |
| GST_LOG_OBJECT (pad, "sending event %p (%s) to peerpad %" GST_PTR_FORMAT, |
| event, GST_EVENT_TYPE_NAME (event), peerpad); |
| |
| result = gst_pad_send_event (peerpad, event); |
| |
| /* Note: we gave away ownership of the event at this point but we can still |
| * print the old pointer */ |
| GST_LOG_OBJECT (pad, |
| "sent event %p to peerpad %" GST_PTR_FORMAT ", result %d", event, peerpad, |
| result); |
| |
| gst_object_unref (peerpad); |
| |
| GST_OBJECT_LOCK (pad); |
| pad->priv->using--; |
| if (pad->priv->using == 0) { |
| /* pad is not active anymore, trigger idle callbacks */ |
| PROBE (pad, GST_PROBE_TYPE_PUSH | GST_PROBE_TYPE_IDLE, NULL, probe_stopped); |
| } |
| GST_OBJECT_UNLOCK (pad); |
| |
| return result | stored; |
| |
| /* ERROR handling */ |
| flushed: |
| { |
| GST_DEBUG_OBJECT (pad, "We're flushing"); |
| GST_OBJECT_UNLOCK (pad); |
| gst_event_unref (event); |
| return stored; |
| } |
| probe_stopped: |
| { |
| GST_DEBUG_OBJECT (pad, "Probe returned %s", gst_flow_get_name (ret)); |
| GST_OBJECT_UNLOCK (pad); |
| gst_event_unref (event); |
| return stored; |
| } |
| not_linked: |
| { |
| GST_DEBUG_OBJECT (pad, "Dropping event because pad is not linked"); |
| GST_OBJECT_UNLOCK (pad); |
| gst_event_unref (event); |
| return stored; |
| } |
| } |
| |
| /** |
| * gst_pad_send_event: |
| * @pad: a #GstPad to send the event to. |
| * @event: (transfer full): the #GstEvent to send to the pad. |
| * |
| * Sends the event to the pad. This function can be used |
| * by applications to send events in the pipeline. |
| * |
| * If @pad is a source pad, @event should be an upstream event. If @pad is a |
| * sink pad, @event should be a downstream event. For example, you would not |
| * send a #GST_EVENT_EOS on a src pad; EOS events only propagate downstream. |
| * Furthermore, some downstream events have to be serialized with data flow, |
| * like EOS, while some can travel out-of-band, like #GST_EVENT_FLUSH_START. If |
| * the event needs to be serialized with data flow, this function will take the |
| * pad's stream lock while calling its event function. |
| * |
| * To find out whether an event type is upstream, downstream, or downstream and |
| * serialized, see #GstEventTypeFlags, gst_event_type_get_flags(), |
| * #GST_EVENT_IS_UPSTREAM, #GST_EVENT_IS_DOWNSTREAM, and |
| * #GST_EVENT_IS_SERIALIZED. Note that in practice that an application or |
| * plugin doesn't need to bother itself with this information; the core handles |
| * all necessary locks and checks. |
| * |
| * This function takes owership of the provided event so you should |
| * gst_event_ref() it if you want to reuse the event after this call. |
| * |
| * Returns: TRUE if the event was handled. |
| */ |
| gboolean |
| gst_pad_send_event (GstPad * pad, GstEvent * event) |
| { |
| GstFlowReturn ret; |
| gboolean result = FALSE; |
| gboolean serialized, need_unlock = FALSE, needs_events, sticky; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| g_return_val_if_fail (event != NULL, FALSE); |
| |
| GST_OBJECT_LOCK (pad); |
| if (GST_PAD_IS_SINK (pad)) { |
| if (G_UNLIKELY (!GST_EVENT_IS_DOWNSTREAM (event))) |
| goto wrong_direction; |
| serialized = GST_EVENT_IS_SERIALIZED (event); |
| sticky = GST_EVENT_IS_STICKY (event); |
| } else if (GST_PAD_IS_SRC (pad)) { |
| if (G_UNLIKELY (!GST_EVENT_IS_UPSTREAM (event))) |
| goto wrong_direction; |
| /* events on srcpad never are serialized and sticky */ |
| serialized = sticky = FALSE; |
| } else |
| goto unknown_direction; |
| |
| /* get the flag first, we clear it when we have a FLUSH or a non-serialized |
| * event. */ |
| needs_events = GST_PAD_NEEDS_EVENTS (pad); |
| |
| switch (GST_EVENT_TYPE (event)) { |
| case GST_EVENT_FLUSH_START: |
| GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad, |
| "have event type %d (FLUSH_START)", GST_EVENT_TYPE (event)); |
| |
| /* can't even accept a flush begin event when flushing */ |
| if (GST_PAD_IS_FLUSHING (pad)) |
| goto flushing; |
| |
| GST_PAD_SET_FLUSHING (pad); |
| GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad, "set flush flag"); |
| needs_events = FALSE; |
| break; |
| case GST_EVENT_FLUSH_STOP: |
| if (G_LIKELY (GST_PAD_ACTIVATE_MODE (pad) != GST_ACTIVATE_NONE)) { |
| GST_PAD_UNSET_FLUSHING (pad); |
| GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad, "cleared flush flag"); |
| } |
| GST_OBJECT_UNLOCK (pad); |
| /* grab stream lock */ |
| GST_PAD_STREAM_LOCK (pad); |
| need_unlock = TRUE; |
| GST_OBJECT_LOCK (pad); |
| needs_events = FALSE; |
| break; |
| case GST_EVENT_RECONFIGURE: |
| if (GST_PAD_IS_SRC (pad)) |
| GST_OBJECT_FLAG_SET (pad, GST_PAD_NEED_RECONFIGURE); |
| default: |
| GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad, "have event type %s", |
| GST_EVENT_TYPE_NAME (event)); |
| |
| if (serialized) { |
| /* lock order: STREAM_LOCK, LOCK, recheck flushing. */ |
| GST_OBJECT_UNLOCK (pad); |
| GST_PAD_STREAM_LOCK (pad); |
| need_unlock = TRUE; |
| GST_OBJECT_LOCK (pad); |
| } else { |
| /* don't forward events on non-serialized events */ |
| needs_events = FALSE; |
| } |
| |
| /* store the event on the pad, but only on srcpads. We need to store the |
| * event before checking the flushing flag. */ |
| if (sticky) { |
| guint idx; |
| PadEvent *ev; |
| |
| switch (GST_EVENT_TYPE (event)) { |
| case GST_EVENT_SEGMENT: |
| if (pad->offset != 0) { |
| GstSegment segment; |
| |
| /* copy segment values */ |
| gst_event_copy_segment (event, &segment); |
| gst_event_unref (event); |
| |
| /* adjust and make a new event with the offset applied */ |
| segment.base += pad->offset; |
| event = gst_event_new_segment (&segment); |
| } |
| break; |
| default: |
| break; |
| } |
| |
| idx = GST_EVENT_STICKY_IDX (event); |
| ev = &pad->priv->events[idx]; |
| |
| if (ev->event != event) { |
| GST_LOG_OBJECT (pad, "storing sticky event %s at index %u", |
| GST_EVENT_TYPE_NAME (event), idx); |
| gst_event_replace (&ev->pending, event); |
| /* set the flag so that we update the events next time. We would |
| * usually update below but we might be flushing too. */ |
| GST_OBJECT_FLAG_SET (pad, GST_PAD_NEED_EVENTS); |
| needs_events = TRUE; |
| } |
| } |
| /* now do the probe */ |
| if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad))) |
| goto flushing; |
| |
| PROBE (pad, GST_PROBE_TYPE_PUSH | GST_PROBE_TYPE_EVENT, event, |
| probe_stopped); |
| |
| break; |
| } |
| |
| if (G_UNLIKELY (needs_events)) { |
| GstFlowReturn ret; |
| |
| GST_OBJECT_FLAG_UNSET (pad, GST_PAD_NEED_EVENTS); |
| |
| GST_DEBUG_OBJECT (pad, "need to update all events"); |
| ret = gst_pad_update_events (pad); |
| if (ret != GST_FLOW_OK) |
| goto update_failed; |
| GST_OBJECT_UNLOCK (pad); |
| |
| gst_event_unref (event); |
| |
| result = TRUE; |
| } |
| |
| /* ensure to pass on event; |
| * note that a sticky event has already been updated above */ |
| if (G_LIKELY (!needs_events || !sticky)) { |
| GstPadEventFunction eventfunc; |
| |
| if (G_UNLIKELY ((eventfunc = GST_PAD_EVENTFUNC (pad)) == NULL)) |
| goto no_function; |
| |
| GST_OBJECT_UNLOCK (pad); |
| |
| result = eventfunc (pad, event); |
| } |
| |
| if (need_unlock) |
| GST_PAD_STREAM_UNLOCK (pad); |
| |
| GST_DEBUG_OBJECT (pad, "sent event, result %d", result); |
| |
| return result; |
| |
| /* ERROR handling */ |
| wrong_direction: |
| { |
| g_warning ("pad %s:%s sending %s event in wrong direction", |
| GST_DEBUG_PAD_NAME (pad), GST_EVENT_TYPE_NAME (event)); |
| GST_OBJECT_UNLOCK (pad); |
| gst_event_unref (event); |
| return FALSE; |
| } |
| unknown_direction: |
| { |
| g_warning ("pad %s:%s has invalid direction", GST_DEBUG_PAD_NAME (pad)); |
| GST_OBJECT_UNLOCK (pad); |
| gst_event_unref (event); |
| return FALSE; |
| } |
| no_function: |
| { |
| g_warning ("pad %s:%s has no event handler, file a bug.", |
| GST_DEBUG_PAD_NAME (pad)); |
| GST_OBJECT_UNLOCK (pad); |
| if (need_unlock) |
| GST_PAD_STREAM_UNLOCK (pad); |
| gst_event_unref (event); |
| return FALSE; |
| } |
| flushing: |
| { |
| GST_OBJECT_UNLOCK (pad); |
| if (need_unlock) |
| GST_PAD_STREAM_UNLOCK (pad); |
| GST_CAT_INFO_OBJECT (GST_CAT_EVENT, pad, |
| "Received event on flushing pad. Discarding"); |
| gst_event_unref (event); |
| return FALSE; |
| } |
| probe_stopped: |
| { |
| GST_DEBUG_OBJECT (pad, "probe returned %s", gst_flow_get_name (ret)); |
| GST_OBJECT_UNLOCK (pad); |
| if (need_unlock) |
| GST_PAD_STREAM_UNLOCK (pad); |
| gst_event_unref (event); |
| return FALSE; |
| } |
| update_failed: |
| { |
| GST_OBJECT_UNLOCK (pad); |
| if (need_unlock) |
| GST_PAD_STREAM_UNLOCK (pad); |
| GST_CAT_INFO_OBJECT (GST_CAT_EVENT, pad, "Update events failed"); |
| gst_event_unref (event); |
| return FALSE; |
| } |
| } |
| |
| /** |
| * gst_pad_set_element_private: |
| * @pad: the #GstPad to set the private data of. |
| * @priv: The private data to attach to the pad. |
| * |
| * Set the given private data gpointer on the pad. |
| * This function can only be used by the element that owns the pad. |
| * No locking is performed in this function. |
| */ |
| void |
| gst_pad_set_element_private (GstPad * pad, gpointer priv) |
| { |
| pad->element_private = priv; |
| } |
| |
| /** |
| * gst_pad_get_element_private: |
| * @pad: the #GstPad to get the private data of. |
| * |
| * Gets the private data of a pad. |
| * No locking is performed in this function. |
| * |
| * Returns: (transfer none): a #gpointer to the private data. |
| */ |
| gpointer |
| gst_pad_get_element_private (GstPad * pad) |
| { |
| return pad->element_private; |
| } |
| |
| /** |
| * gst_pad_get_sticky_event: |
| * @pad: the #GstPad to get the event from. |
| * @event_type: the #GstEventType that should be retrieved. |
| * |
| * Returns a new reference of the sticky event of type @event_type |
| * from the event. |
| * |
| * Returns: (transfer full): a #GstEvent of type @event_type. Unref after usage. |
| */ |
| GstEvent * |
| gst_pad_get_sticky_event (GstPad * pad, GstEventType event_type) |
| { |
| GstEvent *event = NULL; |
| guint idx; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), NULL); |
| g_return_val_if_fail ((event_type & GST_EVENT_TYPE_STICKY) != 0, NULL); |
| |
| idx = GST_EVENT_STICKY_IDX_TYPE (event_type); |
| |
| GST_OBJECT_LOCK (pad); |
| if ((event = pad->priv->events[idx].event)) { |
| gst_event_ref (event); |
| } |
| GST_OBJECT_UNLOCK (pad); |
| |
| return event; |
| } |
| |
| /** |
| * gst_pad_sticky_events_foreach: |
| * @pad: the #GstPad that should be used for iteration. |
| * @foreach_func: (scope call): the #GstPadStickyEventsForeachFunction that should be called for every event. |
| * @user_data: (closure): the optional user data. |
| * |
| * Iterates all active sticky events on @pad and calls @foreach_func for every |
| * event. If @foreach_func returns something else than GST_FLOW_OK the iteration |
| * is immediately stopped. |
| * |
| * Returns: GST_FLOW_OK if iteration was successful |
| */ |
| GstFlowReturn |
| gst_pad_sticky_events_foreach (GstPad * pad, |
| GstPadStickyEventsForeachFunction foreach_func, gpointer user_data) |
| { |
| GstFlowReturn ret = GST_FLOW_OK; |
| guint i; |
| GstEvent *event; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR); |
| g_return_val_if_fail (foreach_func != NULL, GST_FLOW_ERROR); |
| |
| GST_OBJECT_LOCK (pad); |
| |
| restart: |
| for (i = 0; i < GST_EVENT_MAX_STICKY; i++) { |
| gboolean res; |
| PadEvent *ev; |
| |
| ev = &pad->priv->events[i]; |
| |
| /* skip without active event */ |
| if ((event = ev->event) == NULL) |
| continue; |
| |
| gst_event_ref (event); |
| GST_OBJECT_UNLOCK (pad); |
| |
| res = foreach_func (pad, event, user_data); |
| |
| GST_OBJECT_LOCK (pad); |
| gst_event_unref (event); |
| |
| if (res != GST_FLOW_OK) { |
| ret = res; |
| break; |
| } |
| |
| /* things could have changed while we release the lock, check if we still |
| * are handling the same event, if we don't something changed and we have |
| * to try again. FIXME. we need a cookie here. */ |
| if (event != ev->event) { |
| GST_DEBUG_OBJECT (pad, "events changed, restarting"); |
| goto restart; |
| } |
| } |
| GST_OBJECT_UNLOCK (pad); |
| |
| return ret; |
| } |
| |
| static void |
| do_stream_status (GstPad * pad, GstStreamStatusType type, |
| GThread * thread, GstTask * task) |
| { |
| GstElement *parent; |
| |
| GST_DEBUG_OBJECT (pad, "doing stream-status %d", type); |
| |
| if ((parent = GST_ELEMENT_CAST (gst_pad_get_parent (pad)))) { |
| if (GST_IS_ELEMENT (parent)) { |
| GstMessage *message; |
| GValue value = { 0 }; |
| |
| if (type == GST_STREAM_STATUS_TYPE_ENTER) { |
| gchar *tname, *ename, *pname; |
| |
| /* create a good task name */ |
| ename = gst_element_get_name (parent); |
| pname = gst_pad_get_name (pad); |
| tname = g_strdup_printf ("%s:%s", ename, pname); |
| g_free (ename); |
| g_free (pname); |
| |
| gst_object_set_name (GST_OBJECT_CAST (task), tname); |
| g_free (tname); |
| } |
| |
| message = gst_message_new_stream_status (GST_OBJECT_CAST (pad), |
| type, parent); |
| |
| g_value_init (&value, GST_TYPE_TASK); |
| g_value_set_object (&value, task); |
| gst_message_set_stream_status_object (message, &value); |
| g_value_unset (&value); |
| |
| GST_DEBUG_OBJECT (pad, "posting stream-status %d", type); |
| gst_element_post_message (parent, message); |
| } |
| gst_object_unref (parent); |
| } |
| } |
| |
| static void |
| pad_enter_thread (GstTask * task, GThread * thread, gpointer user_data) |
| { |
| do_stream_status (GST_PAD_CAST (user_data), GST_STREAM_STATUS_TYPE_ENTER, |
| thread, task); |
| } |
| |
| static void |
| pad_leave_thread (GstTask * task, GThread * thread, gpointer user_data) |
| { |
| do_stream_status (GST_PAD_CAST (user_data), GST_STREAM_STATUS_TYPE_LEAVE, |
| thread, task); |
| } |
| |
| static GstTaskThreadCallbacks thr_callbacks = { |
| pad_enter_thread, |
| pad_leave_thread, |
| }; |
| |
| /** |
| * gst_pad_start_task: |
| * @pad: the #GstPad to start the task of |
| * @func: the task function to call |
| * @data: data passed to the task function |
| * |
| * Starts a task that repeatedly calls @func with @data. This function |
| * is mostly used in pad activation functions to start the dataflow. |
| * The #GST_PAD_STREAM_LOCK of @pad will automatically be acquired |
| * before @func is called. |
| * |
| * Returns: a %TRUE if the task could be started. |
| */ |
| gboolean |
| gst_pad_start_task (GstPad * pad, GstTaskFunction func, gpointer data) |
| { |
| GstTask *task; |
| gboolean res; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| g_return_val_if_fail (func != NULL, FALSE); |
| |
| GST_DEBUG_OBJECT (pad, "start task"); |
| |
| GST_OBJECT_LOCK (pad); |
| task = GST_PAD_TASK (pad); |
| if (task == NULL) { |
| task = gst_task_create (func, data); |
| gst_task_set_lock (task, GST_PAD_GET_STREAM_LOCK (pad)); |
| gst_task_set_thread_callbacks (task, &thr_callbacks, pad, NULL); |
| GST_DEBUG_OBJECT (pad, "created task"); |
| GST_PAD_TASK (pad) = task; |
| gst_object_ref (task); |
| /* release lock to post the message */ |
| GST_OBJECT_UNLOCK (pad); |
| |
| do_stream_status (pad, GST_STREAM_STATUS_TYPE_CREATE, NULL, task); |
| |
| gst_object_unref (task); |
| |
| GST_OBJECT_LOCK (pad); |
| /* nobody else is supposed to have changed the pad now */ |
| if (GST_PAD_TASK (pad) != task) |
| goto concurrent_stop; |
| } |
| res = gst_task_set_state (task, GST_TASK_STARTED); |
| GST_OBJECT_UNLOCK (pad); |
| |
| return res; |
| |
| /* ERRORS */ |
| concurrent_stop: |
| { |
| GST_OBJECT_UNLOCK (pad); |
| return TRUE; |
| } |
| } |
| |
| /** |
| * gst_pad_pause_task: |
| * @pad: the #GstPad to pause the task of |
| * |
| * Pause the task of @pad. This function will also wait until the |
| * function executed by the task is finished if this function is not |
| * called from the task function. |
| * |
| * Returns: a TRUE if the task could be paused or FALSE when the pad |
| * has no task. |
| */ |
| gboolean |
| gst_pad_pause_task (GstPad * pad) |
| { |
| GstTask *task; |
| gboolean res; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| |
| GST_DEBUG_OBJECT (pad, "pause task"); |
| |
| GST_OBJECT_LOCK (pad); |
| task = GST_PAD_TASK (pad); |
| if (task == NULL) |
| goto no_task; |
| res = gst_task_set_state (task, GST_TASK_PAUSED); |
| GST_OBJECT_UNLOCK (pad); |
| |
| /* wait for task function to finish, this lock is recursive so it does nothing |
| * when the pause is called from the task itself */ |
| GST_PAD_STREAM_LOCK (pad); |
| GST_PAD_STREAM_UNLOCK (pad); |
| |
| return res; |
| |
| no_task: |
| { |
| GST_DEBUG_OBJECT (pad, "pad has no task"); |
| GST_OBJECT_UNLOCK (pad); |
| return FALSE; |
| } |
| } |
| |
| /** |
| * gst_pad_stop_task: |
| * @pad: the #GstPad to stop the task of |
| * |
| * Stop the task of @pad. This function will also make sure that the |
| * function executed by the task will effectively stop if not called |
| * from the GstTaskFunction. |
| * |
| * This function will deadlock if called from the GstTaskFunction of |
| * the task. Use gst_task_pause() instead. |
| * |
| * Regardless of whether the pad has a task, the stream lock is acquired and |
| * released so as to ensure that streaming through this pad has finished. |
| * |
| * Returns: a TRUE if the task could be stopped or FALSE on error. |
| */ |
| gboolean |
| gst_pad_stop_task (GstPad * pad) |
| { |
| GstTask *task; |
| gboolean res; |
| |
| g_return_val_if_fail (GST_IS_PAD (pad), FALSE); |
| |
| GST_DEBUG_OBJECT (pad, "stop task"); |
| |
| GST_OBJECT_LOCK (pad); |
| task = GST_PAD_TASK (pad); |
| if (task == NULL) |
| goto no_task; |
| GST_PAD_TASK (pad) = NULL; |
| res = gst_task_set_state (task, GST_TASK_STOPPED); |
| GST_OBJECT_UNLOCK (pad); |
| |
| GST_PAD_STREAM_LOCK (pad); |
| GST_PAD_STREAM_UNLOCK (pad); |
| |
| if (!gst_task_join (task)) |
| goto join_failed; |
| |
| gst_object_unref (task); |
| |
| return res; |
| |
| no_task: |
| { |
| GST_DEBUG_OBJECT (pad, "no task"); |
| GST_OBJECT_UNLOCK (pad); |
| |
| GST_PAD_STREAM_LOCK (pad); |
| GST_PAD_STREAM_UNLOCK (pad); |
| |
| /* this is not an error */ |
| return TRUE; |
| } |
| join_failed: |
| { |
| /* this is bad, possibly the application tried to join the task from |
| * the task's thread. We install the task again so that it will be stopped |
| * again from the right thread next time hopefully. */ |
| GST_OBJECT_LOCK (pad); |
| GST_DEBUG_OBJECT (pad, "join failed"); |
| /* we can only install this task if there was no other task */ |
| if (GST_PAD_TASK (pad) == NULL) |
| GST_PAD_TASK (pad) = task; |
| GST_OBJECT_UNLOCK (pad); |
| |
| return FALSE; |
| } |
| } |