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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
* 2005 Wim Taymans <wim@fluendo.com>
* 2005 David Schleef <ds@schleef.org>
*
* 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-capsfilter
*
* The element does not modify data as such, but can enforce limitations on the
* data format.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch videotestsrc ! video/x-raw,format=GRAY8 ! videoconvert ! autovideosink
* ]| Limits acceptable video from videotestsrc to be grayscale.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "../../gst/gst-i18n-lib.h"
#include "gstcapsfilter.h"
enum
{
PROP_0,
PROP_FILTER_CAPS
};
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
GST_DEBUG_CATEGORY_STATIC (gst_capsfilter_debug);
#define GST_CAT_DEFAULT gst_capsfilter_debug
#define _do_init \
GST_DEBUG_CATEGORY_INIT (gst_capsfilter_debug, "capsfilter", 0, \
"capsfilter element");
#define gst_capsfilter_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstCapsFilter, gst_capsfilter, GST_TYPE_BASE_TRANSFORM,
_do_init);
static void gst_capsfilter_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_capsfilter_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_capsfilter_dispose (GObject * object);
static GstCaps *gst_capsfilter_transform_caps (GstBaseTransform * base,
GstPadDirection direction, GstCaps * caps, GstCaps * filter);
static gboolean gst_capsfilter_accept_caps (GstBaseTransform * base,
GstPadDirection direction, GstCaps * caps);
static GstFlowReturn gst_capsfilter_transform_ip (GstBaseTransform * base,
GstBuffer * buf);
static GstFlowReturn gst_capsfilter_prepare_buf (GstBaseTransform * trans,
GstBuffer * input, GstBuffer ** buf);
static gboolean gst_capsfilter_sink_event (GstBaseTransform * trans,
GstEvent * event);
static gboolean gst_capsfilter_stop (GstBaseTransform * trans);
static void
gst_capsfilter_class_init (GstCapsFilterClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseTransformClass *trans_class;
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gst_capsfilter_set_property;
gobject_class->get_property = gst_capsfilter_get_property;
gobject_class->dispose = gst_capsfilter_dispose;
g_object_class_install_property (gobject_class, PROP_FILTER_CAPS,
g_param_spec_boxed ("caps", _("Filter caps"),
_("Restrict the possible allowed capabilities (NULL means ANY). "
"Setting this property takes a reference to the supplied GstCaps "
"object."), GST_TYPE_CAPS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class = GST_ELEMENT_CLASS (klass);
gst_element_class_set_static_metadata (gstelement_class,
"CapsFilter",
"Generic",
"Pass data without modification, limiting formats",
"David Schleef <ds@schleef.org>");
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&srctemplate));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sinktemplate));
trans_class = GST_BASE_TRANSFORM_CLASS (klass);
trans_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_capsfilter_transform_caps);
trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_capsfilter_transform_ip);
trans_class->accept_caps = GST_DEBUG_FUNCPTR (gst_capsfilter_accept_caps);
trans_class->prepare_output_buffer =
GST_DEBUG_FUNCPTR (gst_capsfilter_prepare_buf);
trans_class->sink_event = GST_DEBUG_FUNCPTR (gst_capsfilter_sink_event);
trans_class->stop = GST_DEBUG_FUNCPTR (gst_capsfilter_stop);
}
static void
gst_capsfilter_init (GstCapsFilter * filter)
{
GstBaseTransform *trans = GST_BASE_TRANSFORM (filter);
gst_base_transform_set_gap_aware (trans, TRUE);
gst_base_transform_set_prefer_passthrough (trans, FALSE);
filter->filter_caps = gst_caps_new_any ();
}
static void
gst_capsfilter_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstCapsFilter *capsfilter = GST_CAPSFILTER (object);
switch (prop_id) {
case PROP_FILTER_CAPS:{
GstCaps *new_caps;
GstCaps *old_caps;
const GstCaps *new_caps_val = gst_value_get_caps (value);
if (new_caps_val == NULL) {
new_caps = gst_caps_new_any ();
} else {
new_caps = (GstCaps *) new_caps_val;
gst_caps_ref (new_caps);
}
GST_OBJECT_LOCK (capsfilter);
old_caps = capsfilter->filter_caps;
capsfilter->filter_caps = new_caps;
GST_OBJECT_UNLOCK (capsfilter);
gst_caps_unref (old_caps);
GST_DEBUG_OBJECT (capsfilter, "set new caps %" GST_PTR_FORMAT, new_caps);
gst_base_transform_reconfigure_sink (GST_BASE_TRANSFORM (object));
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_capsfilter_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstCapsFilter *capsfilter = GST_CAPSFILTER (object);
switch (prop_id) {
case PROP_FILTER_CAPS:
GST_OBJECT_LOCK (capsfilter);
gst_value_set_caps (value, capsfilter->filter_caps);
GST_OBJECT_UNLOCK (capsfilter);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_capsfilter_dispose (GObject * object)
{
GstCapsFilter *filter = GST_CAPSFILTER (object);
gst_caps_replace (&filter->filter_caps, NULL);
g_list_free_full (filter->pending_events, (GDestroyNotify) gst_event_unref);
filter->pending_events = NULL;
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static GstCaps *
gst_capsfilter_transform_caps (GstBaseTransform * base,
GstPadDirection direction, GstCaps * caps, GstCaps * filter)
{
GstCapsFilter *capsfilter = GST_CAPSFILTER (base);
GstCaps *ret, *filter_caps, *tmp;
GST_OBJECT_LOCK (capsfilter);
filter_caps = gst_caps_ref (capsfilter->filter_caps);
GST_OBJECT_UNLOCK (capsfilter);
if (filter) {
tmp =
gst_caps_intersect_full (filter, filter_caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (filter_caps);
filter_caps = tmp;
}
ret = gst_caps_intersect_full (filter_caps, caps, GST_CAPS_INTERSECT_FIRST);
GST_DEBUG_OBJECT (capsfilter, "input: %" GST_PTR_FORMAT, caps);
GST_DEBUG_OBJECT (capsfilter, "filter: %" GST_PTR_FORMAT, filter);
GST_DEBUG_OBJECT (capsfilter, "caps filter: %" GST_PTR_FORMAT,
filter_caps);
GST_DEBUG_OBJECT (capsfilter, "intersect: %" GST_PTR_FORMAT, ret);
gst_caps_unref (filter_caps);
return ret;
}
static gboolean
gst_capsfilter_accept_caps (GstBaseTransform * base,
GstPadDirection direction, GstCaps * caps)
{
GstCapsFilter *capsfilter = GST_CAPSFILTER (base);
GstCaps *filter_caps;
gboolean ret;
GST_OBJECT_LOCK (capsfilter);
filter_caps = gst_caps_ref (capsfilter->filter_caps);
GST_OBJECT_UNLOCK (capsfilter);
ret = gst_caps_can_intersect (caps, filter_caps);
GST_DEBUG_OBJECT (capsfilter, "can intersect: %d", ret);
if (ret) {
/* if we can intersect, see if the other end also accepts */
if (direction == GST_PAD_SRC)
ret =
gst_pad_peer_query_accept_caps (GST_BASE_TRANSFORM_SINK_PAD (base),
caps);
else
ret =
gst_pad_peer_query_accept_caps (GST_BASE_TRANSFORM_SRC_PAD (base),
caps);
GST_DEBUG_OBJECT (capsfilter, "peer accept: %d", ret);
}
gst_caps_unref (filter_caps);
return ret;
}
static GstFlowReturn
gst_capsfilter_transform_ip (GstBaseTransform * base, GstBuffer * buf)
{
/* No actual work here. It's all done in the prepare output buffer
* func. */
return GST_FLOW_OK;
}
static void
gst_capsfilter_push_pending_events (GstCapsFilter * filter, GList * events)
{
GList *l;
for (l = g_list_last (events); l; l = l->prev) {
GST_LOG_OBJECT (filter, "Forwarding %s event",
GST_EVENT_TYPE_NAME (l->data));
GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (GST_BASE_TRANSFORM_CAST
(filter), l->data);
}
g_list_free (events);
}
/* Ouput buffer preparation ... if the buffer has no caps, and our allowed
* output caps is fixed, then send the caps downstream, making sure caps are
* sent before segment event.
*
* This ensures that caps event is sent if we can, so that pipelines like:
* gst-launch filesrc location=rawsamples.raw !
* audio/x-raw,format=S16LE,rate=48000,channels=2 ! alsasink
* will work.
*/
static GstFlowReturn
gst_capsfilter_prepare_buf (GstBaseTransform * trans, GstBuffer * input,
GstBuffer ** buf)
{
GstFlowReturn ret = GST_FLOW_OK;
GstCapsFilter *filter = GST_CAPSFILTER (trans);
/* always return the input as output buffer */
*buf = input;
if (GST_PAD_MODE (trans->srcpad) == GST_PAD_MODE_PUSH
&& !gst_pad_has_current_caps (trans->sinkpad)) {
/* No caps. See if the output pad only supports fixed caps */
GstCaps *out_caps;
GList *pending_events = filter->pending_events;
GST_LOG_OBJECT (trans, "Input pad does not have caps");
filter->pending_events = NULL;
out_caps = gst_pad_get_current_caps (trans->srcpad);
if (out_caps == NULL) {
out_caps = gst_pad_get_allowed_caps (trans->srcpad);
g_return_val_if_fail (out_caps != NULL, GST_FLOW_ERROR);
}
out_caps = gst_caps_simplify (out_caps);
if (gst_caps_is_fixed (out_caps) && !gst_caps_is_empty (out_caps)) {
GST_DEBUG_OBJECT (trans, "Have fixed output caps %"
GST_PTR_FORMAT " to apply to srcpad", out_caps);
if (!gst_pad_has_current_caps (trans->srcpad)) {
if (gst_pad_set_caps (trans->srcpad, out_caps)) {
if (pending_events) {
gst_capsfilter_push_pending_events (filter, pending_events);
pending_events = NULL;
}
} else {
ret = GST_FLOW_NOT_NEGOTIATED;
}
}
g_list_free_full (pending_events, (GDestroyNotify) gst_event_unref);
gst_caps_unref (out_caps);
} else {
gchar *caps_str = gst_caps_to_string (out_caps);
GST_DEBUG_OBJECT (trans, "Cannot choose caps. Have unfixed output caps %"
GST_PTR_FORMAT, out_caps);
gst_caps_unref (out_caps);
GST_ELEMENT_ERROR (trans, STREAM, FORMAT,
("Filter caps do not completely specify the output format"),
("Output caps are unfixed: %s", caps_str));
g_free (caps_str);
g_list_free_full (pending_events, (GDestroyNotify) gst_event_unref);
ret = GST_FLOW_ERROR;
}
} else if (G_UNLIKELY (filter->pending_events)) {
GList *events = filter->pending_events;
filter->pending_events = NULL;
/* push pending events before a buffer */
gst_capsfilter_push_pending_events (filter, events);
}
return ret;
}
/* Queue the segment event if there was no caps event */
static gboolean
gst_capsfilter_sink_event (GstBaseTransform * trans, GstEvent * event)
{
GstCapsFilter *filter = GST_CAPSFILTER (trans);
if (GST_EVENT_TYPE (event) == GST_EVENT_FLUSH_STOP) {
GList *l;
for (l = filter->pending_events; l; l = l->next) {
if (GST_EVENT_TYPE (l->data) == GST_EVENT_SEGMENT) {
gst_event_unref (l->data);
filter->pending_events = g_list_delete_link (filter->pending_events, l);
break;
}
}
}
if (!GST_EVENT_IS_STICKY (event)
|| GST_EVENT_TYPE (event) <= GST_EVENT_CAPS)
goto done;
/* If we get EOS before any buffers, just push all pending events */
if (GST_EVENT_TYPE (event) == GST_EVENT_EOS) {
GList *l;
for (l = g_list_last (filter->pending_events); l; l = l->prev) {
GST_LOG_OBJECT (trans, "Forwarding %s event",
GST_EVENT_TYPE_NAME (l->data));
GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, l->data);
}
g_list_free (filter->pending_events);
filter->pending_events = NULL;
} else if (!gst_pad_has_current_caps (trans->sinkpad)) {
GST_LOG_OBJECT (trans, "Got %s event before caps, queueing",
GST_EVENT_TYPE_NAME (event));
filter->pending_events = g_list_prepend (filter->pending_events, event);
return TRUE;
}
done:
GST_LOG_OBJECT (trans, "Forwarding %s event", GST_EVENT_TYPE_NAME (event));
return GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event);
}
static gboolean
gst_capsfilter_stop (GstBaseTransform * trans)
{
GstCapsFilter *filter = GST_CAPSFILTER (trans);
g_list_free_full (filter->pending_events, (GDestroyNotify) gst_event_unref);
filter->pending_events = NULL;
return TRUE;
}