| /* GStreamer output selector |
| * Copyright (C) 2008 Nokia Corporation. (contact <stefan.kost@nokia.com>) |
| * |
| * 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., 51 Franklin St, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| /** |
| * SECTION:element-output-selector |
| * @see_also: #GstOutputSelector, #GstInputSelector |
| * |
| * Direct input stream to one out of N output pads. |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <string.h> |
| |
| #include "gstoutputselector.h" |
| |
| GST_DEBUG_CATEGORY_STATIC (output_selector_debug); |
| #define GST_CAT_DEFAULT output_selector_debug |
| |
| static GstStaticPadTemplate gst_output_selector_sink_factory = |
| GST_STATIC_PAD_TEMPLATE ("sink", |
| GST_PAD_SINK, |
| GST_PAD_ALWAYS, |
| GST_STATIC_CAPS_ANY); |
| |
| static GstStaticPadTemplate gst_output_selector_src_factory = |
| GST_STATIC_PAD_TEMPLATE ("src_%u", |
| GST_PAD_SRC, |
| GST_PAD_REQUEST, |
| GST_STATIC_CAPS_ANY); |
| |
| #define GST_TYPE_OUTPUT_SELECTOR_PAD_NEGOTIATION_MODE (gst_output_selector_pad_negotiation_mode_get_type()) |
| static GType |
| gst_output_selector_pad_negotiation_mode_get_type (void) |
| { |
| static GType pad_negotiation_mode_type = 0; |
| static const GEnumValue pad_negotiation_modes[] = { |
| {GST_OUTPUT_SELECTOR_PAD_NEGOTIATION_MODE_NONE, "None", "none"}, |
| {GST_OUTPUT_SELECTOR_PAD_NEGOTIATION_MODE_ALL, "All", "all"}, |
| {GST_OUTPUT_SELECTOR_PAD_NEGOTIATION_MODE_ACTIVE, "Active", "active"}, |
| {0, NULL, NULL} |
| }; |
| |
| if (!pad_negotiation_mode_type) { |
| pad_negotiation_mode_type = |
| g_enum_register_static ("GstOutputSelectorPadNegotiationMode", |
| pad_negotiation_modes); |
| } |
| return pad_negotiation_mode_type; |
| } |
| |
| |
| enum |
| { |
| PROP_0, |
| PROP_ACTIVE_PAD, |
| PROP_RESEND_LATEST, |
| PROP_PAD_NEGOTIATION_MODE |
| }; |
| |
| #define DEFAULT_PAD_NEGOTIATION_MODE GST_OUTPUT_SELECTOR_PAD_NEGOTIATION_MODE_ALL |
| |
| #define _do_init \ |
| GST_DEBUG_CATEGORY_INIT (output_selector_debug, \ |
| "output-selector", 0, "Output stream selector"); |
| #define gst_output_selector_parent_class parent_class |
| G_DEFINE_TYPE_WITH_CODE (GstOutputSelector, gst_output_selector, |
| GST_TYPE_ELEMENT, _do_init); |
| |
| static void gst_output_selector_dispose (GObject * object); |
| static void gst_output_selector_set_property (GObject * object, |
| guint prop_id, const GValue * value, GParamSpec * pspec); |
| static void gst_output_selector_get_property (GObject * object, |
| guint prop_id, GValue * value, GParamSpec * pspec); |
| static GstPad *gst_output_selector_request_new_pad (GstElement * element, |
| GstPadTemplate * templ, const gchar * unused, const GstCaps * caps); |
| static void gst_output_selector_release_pad (GstElement * element, |
| GstPad * pad); |
| static GstFlowReturn gst_output_selector_chain (GstPad * pad, |
| GstObject * parent, GstBuffer * buf); |
| static GstStateChangeReturn gst_output_selector_change_state (GstElement * |
| element, GstStateChange transition); |
| static gboolean gst_output_selector_event (GstPad * pad, GstObject * parent, |
| GstEvent * event); |
| static gboolean gst_output_selector_query (GstPad * pad, GstObject * parent, |
| GstQuery * query); |
| static void gst_output_selector_switch_pad_negotiation_mode (GstOutputSelector * |
| sel, gint mode); |
| |
| static void |
| gst_output_selector_class_init (GstOutputSelectorClass * klass) |
| { |
| GObjectClass *gobject_class = G_OBJECT_CLASS (klass); |
| GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass); |
| |
| gobject_class->dispose = gst_output_selector_dispose; |
| |
| gobject_class->set_property = gst_output_selector_set_property; |
| gobject_class->get_property = gst_output_selector_get_property; |
| |
| g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD, |
| g_param_spec_object ("active-pad", "Active pad", |
| "Currently active src pad", GST_TYPE_PAD, |
| G_PARAM_READWRITE | GST_PARAM_MUTABLE_PLAYING | |
| G_PARAM_STATIC_STRINGS)); |
| g_object_class_install_property (gobject_class, PROP_RESEND_LATEST, |
| g_param_spec_boolean ("resend-latest", "Resend latest buffer", |
| "Resend latest buffer after a switch to a new pad", FALSE, |
| G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); |
| g_object_class_install_property (gobject_class, PROP_PAD_NEGOTIATION_MODE, |
| g_param_spec_enum ("pad-negotiation-mode", "Pad negotiation mode", |
| "The mode to be used for pad negotiation", |
| GST_TYPE_OUTPUT_SELECTOR_PAD_NEGOTIATION_MODE, |
| DEFAULT_PAD_NEGOTIATION_MODE, |
| G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); |
| |
| gst_element_class_set_static_metadata (gstelement_class, "Output selector", |
| "Generic", "1-to-N output stream selector", |
| "Stefan Kost <stefan.kost@nokia.com>"); |
| gst_element_class_add_pad_template (gstelement_class, |
| gst_static_pad_template_get (&gst_output_selector_sink_factory)); |
| gst_element_class_add_pad_template (gstelement_class, |
| gst_static_pad_template_get (&gst_output_selector_src_factory)); |
| |
| gstelement_class->request_new_pad = |
| GST_DEBUG_FUNCPTR (gst_output_selector_request_new_pad); |
| gstelement_class->release_pad = |
| GST_DEBUG_FUNCPTR (gst_output_selector_release_pad); |
| |
| gstelement_class->change_state = gst_output_selector_change_state; |
| } |
| |
| static void |
| gst_output_selector_init (GstOutputSelector * sel) |
| { |
| sel->sinkpad = |
| gst_pad_new_from_static_template (&gst_output_selector_sink_factory, |
| "sink"); |
| gst_pad_set_chain_function (sel->sinkpad, |
| GST_DEBUG_FUNCPTR (gst_output_selector_chain)); |
| gst_pad_set_event_function (sel->sinkpad, |
| GST_DEBUG_FUNCPTR (gst_output_selector_event)); |
| gst_pad_set_query_function (sel->sinkpad, |
| GST_DEBUG_FUNCPTR (gst_output_selector_query)); |
| |
| gst_element_add_pad (GST_ELEMENT (sel), sel->sinkpad); |
| |
| /* srcpad management */ |
| sel->active_srcpad = NULL; |
| sel->nb_srcpads = 0; |
| gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED); |
| sel->pending_srcpad = NULL; |
| |
| sel->resend_latest = FALSE; |
| sel->latest_buffer = NULL; |
| gst_output_selector_switch_pad_negotiation_mode (sel, |
| DEFAULT_PAD_NEGOTIATION_MODE); |
| } |
| |
| static void |
| gst_output_selector_reset (GstOutputSelector * osel) |
| { |
| if (osel->pending_srcpad != NULL) { |
| gst_object_unref (osel->pending_srcpad); |
| osel->pending_srcpad = NULL; |
| } |
| if (osel->latest_buffer != NULL) { |
| gst_buffer_unref (osel->latest_buffer); |
| osel->latest_buffer = NULL; |
| } |
| gst_segment_init (&osel->segment, GST_FORMAT_UNDEFINED); |
| } |
| |
| static void |
| gst_output_selector_dispose (GObject * object) |
| { |
| GstOutputSelector *osel = GST_OUTPUT_SELECTOR (object); |
| |
| gst_output_selector_reset (osel); |
| |
| G_OBJECT_CLASS (parent_class)->dispose (object); |
| } |
| |
| static void |
| gst_output_selector_set_property (GObject * object, guint prop_id, |
| const GValue * value, GParamSpec * pspec) |
| { |
| GstOutputSelector *sel = GST_OUTPUT_SELECTOR (object); |
| |
| switch (prop_id) { |
| case PROP_ACTIVE_PAD: |
| { |
| GstPad *next_pad; |
| |
| next_pad = g_value_get_object (value); |
| |
| GST_INFO_OBJECT (sel, "Activating pad %s:%s", |
| GST_DEBUG_PAD_NAME (next_pad)); |
| |
| GST_OBJECT_LOCK (object); |
| if (next_pad != sel->active_srcpad) { |
| /* switch to new srcpad in next chain run */ |
| if (sel->pending_srcpad != NULL) { |
| GST_INFO ("replacing pending switch"); |
| gst_object_unref (sel->pending_srcpad); |
| } |
| if (next_pad) |
| gst_object_ref (next_pad); |
| sel->pending_srcpad = next_pad; |
| } else { |
| GST_INFO ("pad already active"); |
| if (sel->pending_srcpad != NULL) { |
| gst_object_unref (sel->pending_srcpad); |
| sel->pending_srcpad = NULL; |
| } |
| } |
| GST_OBJECT_UNLOCK (object); |
| break; |
| } |
| case PROP_RESEND_LATEST:{ |
| sel->resend_latest = g_value_get_boolean (value); |
| break; |
| } |
| case PROP_PAD_NEGOTIATION_MODE:{ |
| gst_output_selector_switch_pad_negotiation_mode (sel, |
| g_value_get_enum (value)); |
| break; |
| } |
| default: |
| G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
| break; |
| } |
| } |
| |
| static void |
| gst_output_selector_get_property (GObject * object, guint prop_id, |
| GValue * value, GParamSpec * pspec) |
| { |
| GstOutputSelector *sel = GST_OUTPUT_SELECTOR (object); |
| |
| switch (prop_id) { |
| case PROP_ACTIVE_PAD: |
| GST_OBJECT_LOCK (object); |
| g_value_set_object (value, |
| sel->pending_srcpad ? sel->pending_srcpad : sel->active_srcpad); |
| GST_OBJECT_UNLOCK (object); |
| break; |
| case PROP_RESEND_LATEST:{ |
| GST_OBJECT_LOCK (object); |
| g_value_set_boolean (value, sel->resend_latest); |
| GST_OBJECT_UNLOCK (object); |
| break; |
| } |
| case PROP_PAD_NEGOTIATION_MODE: |
| g_value_set_enum (value, sel->pad_negotiation_mode); |
| break; |
| default: |
| G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
| break; |
| } |
| } |
| |
| static GstPad * |
| gst_output_selector_get_active (GstOutputSelector * sel) |
| { |
| GstPad *active = NULL; |
| |
| GST_OBJECT_LOCK (sel); |
| if (sel->pending_srcpad) |
| active = gst_object_ref (sel->pending_srcpad); |
| else if (sel->active_srcpad) |
| active = gst_object_ref (sel->active_srcpad); |
| GST_OBJECT_UNLOCK (sel); |
| |
| return active; |
| } |
| |
| static void |
| gst_output_selector_switch_pad_negotiation_mode (GstOutputSelector * sel, |
| gint mode) |
| { |
| sel->pad_negotiation_mode = mode; |
| } |
| |
| static gboolean |
| forward_sticky_events (GstPad * pad, GstEvent ** event, gpointer user_data) |
| { |
| GstPad *srcpad = GST_PAD_CAST (user_data); |
| |
| gst_pad_push_event (srcpad, gst_event_ref (*event)); |
| |
| return TRUE; |
| } |
| |
| static GstPad * |
| gst_output_selector_request_new_pad (GstElement * element, |
| GstPadTemplate * templ, const gchar * name, const GstCaps * caps) |
| { |
| gchar *padname; |
| GstPad *srcpad; |
| GstOutputSelector *osel; |
| |
| osel = GST_OUTPUT_SELECTOR (element); |
| |
| GST_DEBUG_OBJECT (osel, "requesting pad"); |
| |
| GST_OBJECT_LOCK (osel); |
| padname = g_strdup_printf ("src_%u", osel->nb_srcpads++); |
| srcpad = gst_pad_new_from_template (templ, padname); |
| GST_OBJECT_UNLOCK (osel); |
| |
| gst_pad_set_active (srcpad, TRUE); |
| |
| /* Forward sticky events to the new srcpad */ |
| gst_pad_sticky_events_foreach (osel->sinkpad, forward_sticky_events, srcpad); |
| |
| gst_element_add_pad (GST_ELEMENT (osel), srcpad); |
| |
| /* Set the first requested src pad as active by default */ |
| if (osel->active_srcpad == NULL) { |
| osel->active_srcpad = srcpad; |
| } |
| g_free (padname); |
| |
| return srcpad; |
| } |
| |
| static void |
| gst_output_selector_release_pad (GstElement * element, GstPad * pad) |
| { |
| GstOutputSelector *osel; |
| |
| osel = GST_OUTPUT_SELECTOR (element); |
| |
| GST_DEBUG_OBJECT (osel, "releasing pad"); |
| |
| gst_pad_set_active (pad, FALSE); |
| |
| gst_element_remove_pad (GST_ELEMENT_CAST (osel), pad); |
| } |
| |
| static gboolean |
| gst_output_selector_switch (GstOutputSelector * osel) |
| { |
| gboolean res = FALSE; |
| GstEvent *ev = NULL; |
| GstSegment *seg = NULL; |
| |
| /* Switch */ |
| GST_OBJECT_LOCK (GST_OBJECT (osel)); |
| GST_INFO_OBJECT (osel, "switching to pad %" GST_PTR_FORMAT, |
| osel->pending_srcpad); |
| if (gst_pad_is_linked (osel->pending_srcpad)) { |
| osel->active_srcpad = osel->pending_srcpad; |
| res = TRUE; |
| } |
| gst_object_unref (osel->pending_srcpad); |
| osel->pending_srcpad = NULL; |
| GST_OBJECT_UNLOCK (GST_OBJECT (osel)); |
| |
| /* Send SEGMENT event and latest buffer if switching succeeded |
| * and we already have a valid segment configured */ |
| if (res) { |
| gst_pad_sticky_events_foreach (osel->sinkpad, forward_sticky_events, |
| osel->active_srcpad); |
| |
| /* update segment if required */ |
| if (osel->segment.format != GST_FORMAT_UNDEFINED) { |
| /* Send SEGMENT to the pad we are going to switch to */ |
| seg = &osel->segment; |
| /* If resending then mark segment start and position accordingly */ |
| if (osel->resend_latest && osel->latest_buffer && |
| GST_BUFFER_TIMESTAMP_IS_VALID (osel->latest_buffer)) { |
| seg->position = GST_BUFFER_TIMESTAMP (osel->latest_buffer); |
| } |
| |
| ev = gst_event_new_segment (seg); |
| |
| if (!gst_pad_push_event (osel->active_srcpad, ev)) { |
| GST_WARNING_OBJECT (osel, |
| "newsegment handling failed in %" GST_PTR_FORMAT, |
| osel->active_srcpad); |
| } |
| } |
| |
| /* Resend latest buffer to newly switched pad */ |
| if (osel->resend_latest && osel->latest_buffer) { |
| GST_INFO ("resending latest buffer"); |
| gst_pad_push (osel->active_srcpad, gst_buffer_ref (osel->latest_buffer)); |
| } |
| } else { |
| GST_WARNING_OBJECT (osel, "switch failed, pad not linked"); |
| } |
| |
| return res; |
| } |
| |
| static GstFlowReturn |
| gst_output_selector_chain (GstPad * pad, GstObject * parent, GstBuffer * buf) |
| { |
| GstFlowReturn res; |
| GstOutputSelector *osel; |
| GstClockTime position, duration; |
| |
| osel = GST_OUTPUT_SELECTOR (parent); |
| |
| /* |
| * The _switch function might push a buffer if 'resend-latest' is true. |
| * |
| * Elements/Applications (e.g. camerabin) might use pad probes to |
| * switch output-selector's active pad. If we simply switch and don't |
| * recheck any pending pad switch the following codepath could end |
| * up pushing a buffer on a non-active pad. This is bad. |
| * |
| * So we always should check the pending_srcpad before going further down |
| * the chain and pushing the new buffer |
| */ |
| while (osel->pending_srcpad) { |
| /* Do the switch */ |
| gst_output_selector_switch (osel); |
| } |
| |
| if (osel->latest_buffer) { |
| gst_buffer_unref (osel->latest_buffer); |
| osel->latest_buffer = NULL; |
| } |
| |
| if (osel->resend_latest) { |
| /* Keep reference to latest buffer to resend it after switch */ |
| osel->latest_buffer = gst_buffer_ref (buf); |
| } |
| |
| /* Keep track of last stop and use it in SEGMENT start after |
| switching to a new src pad */ |
| position = GST_BUFFER_TIMESTAMP (buf); |
| if (GST_CLOCK_TIME_IS_VALID (position)) { |
| duration = GST_BUFFER_DURATION (buf); |
| if (GST_CLOCK_TIME_IS_VALID (duration)) { |
| position += duration; |
| } |
| GST_LOG_OBJECT (osel, "setting last stop %" GST_TIME_FORMAT, |
| GST_TIME_ARGS (position)); |
| osel->segment.position = position; |
| } |
| |
| GST_LOG_OBJECT (osel, "pushing buffer to %" GST_PTR_FORMAT, |
| osel->active_srcpad); |
| res = gst_pad_push (osel->active_srcpad, buf); |
| |
| return res; |
| } |
| |
| static GstStateChangeReturn |
| gst_output_selector_change_state (GstElement * element, |
| GstStateChange transition) |
| { |
| GstOutputSelector *sel; |
| GstStateChangeReturn result; |
| |
| sel = GST_OUTPUT_SELECTOR (element); |
| |
| switch (transition) { |
| case GST_STATE_CHANGE_READY_TO_PAUSED: |
| break; |
| default: |
| break; |
| } |
| |
| result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); |
| |
| switch (transition) { |
| case GST_STATE_CHANGE_PAUSED_TO_READY: |
| gst_output_selector_reset (sel); |
| break; |
| default: |
| break; |
| } |
| |
| return result; |
| } |
| |
| static gboolean |
| gst_output_selector_forward_event (GstOutputSelector * sel, GstEvent * event) |
| { |
| gboolean res = TRUE; |
| GstPad *active; |
| |
| switch (sel->pad_negotiation_mode) { |
| case GST_OUTPUT_SELECTOR_PAD_NEGOTIATION_MODE_ALL: |
| /* Send to all src pads */ |
| res = gst_pad_event_default (sel->sinkpad, GST_OBJECT_CAST (sel), event); |
| break; |
| case GST_OUTPUT_SELECTOR_PAD_NEGOTIATION_MODE_NONE: |
| gst_event_unref (event); |
| break; |
| default: |
| active = gst_output_selector_get_active (sel); |
| if (active) { |
| res = gst_pad_push_event (active, event); |
| gst_object_unref (active); |
| } else { |
| gst_event_unref (event); |
| } |
| break; |
| } |
| |
| return res; |
| } |
| |
| static gboolean |
| gst_output_selector_event (GstPad * pad, GstObject * parent, GstEvent * event) |
| { |
| gboolean res = TRUE; |
| GstOutputSelector *sel; |
| GstPad *active = NULL; |
| |
| sel = GST_OUTPUT_SELECTOR (parent); |
| |
| switch (GST_EVENT_TYPE (event)) { |
| case GST_EVENT_EOS: |
| { |
| res = gst_output_selector_forward_event (sel, event); |
| break; |
| } |
| case GST_EVENT_SEGMENT: |
| { |
| gst_event_copy_segment (event, &sel->segment); |
| GST_DEBUG_OBJECT (sel, "configured SEGMENT %" GST_SEGMENT_FORMAT, |
| &sel->segment); |
| /* fall through */ |
| } |
| default: |
| { |
| active = gst_output_selector_get_active (sel); |
| if (active) { |
| res = gst_pad_push_event (active, event); |
| gst_object_unref (active); |
| } else { |
| gst_event_unref (event); |
| } |
| break; |
| } |
| } |
| |
| return res; |
| } |
| |
| static gboolean |
| gst_output_selector_query (GstPad * pad, GstObject * parent, GstQuery * query) |
| { |
| gboolean res = TRUE; |
| GstOutputSelector *sel; |
| GstPad *active = NULL; |
| |
| sel = GST_OUTPUT_SELECTOR (parent); |
| |
| switch (GST_QUERY_TYPE (query)) { |
| case GST_QUERY_CAPS: |
| { |
| switch (sel->pad_negotiation_mode) { |
| case GST_OUTPUT_SELECTOR_PAD_NEGOTIATION_MODE_ALL: |
| /* Send caps to all src pads */ |
| res = gst_pad_proxy_query_caps (pad, query); |
| break; |
| case GST_OUTPUT_SELECTOR_PAD_NEGOTIATION_MODE_NONE: |
| res = FALSE; |
| break; |
| default: |
| active = gst_output_selector_get_active (sel); |
| if (active) { |
| res = gst_pad_peer_query (active, query); |
| gst_object_unref (active); |
| } else { |
| res = FALSE; |
| } |
| break; |
| } |
| break; |
| } |
| case GST_QUERY_DRAIN: |
| if (sel->latest_buffer) { |
| gst_buffer_unref (sel->latest_buffer); |
| sel->latest_buffer = NULL; |
| } |
| /* fall through */ |
| default: |
| res = gst_pad_query_default (pad, parent, query); |
| break; |
| } |
| |
| return res; |
| } |