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sdp: Add new sdpsrc element

Browse source 
This can read from an SDP file or get the SDP data via property. Works
around the problem that sdpdemux inside decodebin fails because the
GST_STATE_CHANGE_NO_PREROLL is not observed by the pipeline.

See https://bugzilla.gnome.org/show_bug.cgi?id=702495

https://bugzilla.gnome.org/show_bug.cgi?id=762860
This commit is contained in:
Sebastian Dröge 2016-02-29 11:39:54 +02:00
parent cfbe7d1399
commit b53f682d75
4 changed files with 400 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
gst/sdp/Makefile.am
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@ -1,12 +1,13 @@
plugin_LTLIBRARIES = libgstsdpelem.la
libgstsdpelem_la_SOURCES = gstsdpelem.c gstsdpdemux.h gstsdpdemux.c
libgstsdpelem_la_SOURCES = gstsdpelem.c gstsdpsrc.c gstsdpdemux.c
libgstsdpelem_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_CFLAGS) $(GIO_CFLAGS)
libgstsdpelem_la_LIBADD = $(GST_PLUGINS_BASE_LIBS) $(GST_BASE_LIBS) $(GIO_LIBS) \
-lgstrtp-@GST_API_VERSION@ -lgstsdp-@GST_API_VERSION@ \
-lgstapp-@GST_API_VERSION@ \
$(GST_LIBS) $(WINSOCK2_LIBS)
libgstsdpelem_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
libgstsdpelem_la_LIBTOOLFLAGS = $(GST_PLUGIN_LIBTOOLFLAGS)
noinst_HEADERS = gstsdpdemux.h
noinst_HEADERS = gstsdpdemux.h gstsdpsrc.h

3
gst/sdp/gstsdpelem.c
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@ -22,6 +22,7 @@
#endif
#include "gstsdpdemux.h"
#include "gstsdpsrc.h"
static gboolean
plugin_init (GstPlugin * plugin)
@ -29,6 +30,8 @@ plugin_init (GstPlugin * plugin)
if (!gst_element_register (plugin, "sdpdemux", GST_RANK_NONE,
GST_TYPE_SDP_DEMUX))
return FALSE;
if (!gst_element_register (plugin, "sdpsrc", GST_RANK_NONE, GST_TYPE_SDP_SRC))
return FALSE;
return TRUE;
}

332
gst/sdp/gstsdpsrc.c Normal file
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@ -0,0 +1,332 @@
/*
* Copyright (C) 2016 Sebastian Dröge <sebastian@centricular.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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstsdpsrc.h"
#include <gst/app/app.h>
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (sdp_src_debug);
#define GST_CAT_DEFAULT sdp_src_debug
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("stream_%u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS ("application/x-rtp"));
enum
{
PROP_0,
PROP_LOCATION,
PROP_SDP
};
static void gst_sdp_src_handler_init (gpointer g_iface, gpointer iface_data);
#define gst_sdp_src_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstSdpSrc, gst_sdp_src, GST_TYPE_BIN,
G_IMPLEMENT_INTERFACE (GST_TYPE_URI_HANDLER, gst_sdp_src_handler_init));
static void
gst_sdp_src_finalize (GObject * object)
{
GstSdpSrc *self = GST_SDP_SRC_CAST (object);
if (self->sdp_buffer)
gst_buffer_unref (self->sdp_buffer);
g_free (self->location);
g_free (self->sdp);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_sdp_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstSdpSrc *self = GST_SDP_SRC_CAST (object);
switch (prop_id) {
case PROP_LOCATION:
g_value_set_string (value, self->location);
break;
case PROP_SDP:
g_value_set_string (value, self->sdp);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_sdp_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstSdpSrc *self = GST_SDP_SRC_CAST (object);
switch (prop_id) {
case PROP_LOCATION:
g_free (self->location);
self->location = g_value_dup_string (value);
break;
case PROP_SDP:
g_free (self->sdp);
self->sdp = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
pad_added_cb (GstElement * element, GstPad * pad, gpointer user_data)
{
GstSdpSrc *self = GST_SDP_SRC_CAST (user_data);
GstPad *ghost;
ghost =
gst_ghost_pad_new_from_template (GST_PAD_NAME (pad), pad,
gst_static_pad_template_get (&src_template));
gst_pad_set_active (ghost, TRUE);
gst_element_add_pad (GST_ELEMENT_CAST (self), ghost);
}
static void
pad_removed_cb (GstElement * element, GstPad * pad, gpointer user_data)
{
GstSdpSrc *self = GST_SDP_SRC_CAST (user_data);
GstPad *peer;
peer = gst_pad_get_peer (pad);
if (peer) {
GstPad *ghost =
GST_PAD_CAST (gst_proxy_pad_get_internal (GST_PROXY_PAD (peer)));
if (ghost) {
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (ghost), NULL);
gst_element_remove_pad (GST_ELEMENT_CAST (self), ghost);
gst_object_unref (ghost);
}
gst_object_unref (peer);
}
}
static void
no_more_pads_cb (GstElement * element, gpointer user_data)
{
gst_element_no_more_pads (GST_ELEMENT_CAST (user_data));
}
static void
remove_pad (const GValue * item, gpointer user_data)
{
GstElement *self = user_data;
GstPad *pad = g_value_get_object (item);
gst_element_remove_pad (self, pad);
}
static GstStateChangeReturn
gst_sdp_src_change_state (GstElement * element, GstStateChange transition)
{
GstSdpSrc *self = GST_SDP_SRC_CAST (element);
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
GST_OBJECT_LOCK (self);
if (self->sdp_buffer)
gst_buffer_unref (self->sdp_buffer);
self->sdp_buffer = NULL;
if (self->location && strcmp (self->location, "sdp://") != 0) {
/* Do nothing */
} else if (self->sdp) {
self->sdp_buffer =
gst_buffer_new_wrapped (self->sdp, strlen (self->sdp) + 1);
} else {
ret = GST_STATE_CHANGE_FAILURE;
}
GST_OBJECT_UNLOCK (self);
if (ret != GST_STATE_CHANGE_FAILURE) {
if (self->sdp_buffer) {
GstCaps *caps = gst_caps_new_empty_simple ("application/sdp");
self->src = gst_element_factory_make ("appsrc", NULL);
g_object_set (self->src, "caps", caps, "emit-signals", FALSE, NULL);
gst_caps_unref (caps);
} else {
self->src = gst_element_factory_make ("filesrc", NULL);
g_object_set (self->src, "location", self->location + 6, NULL);
}
self->demux = gst_element_factory_make ("sdpdemux", NULL);
g_signal_connect (self->demux, "pad-added", G_CALLBACK (pad_added_cb),
self);
g_signal_connect (self->demux, "pad-removed",
G_CALLBACK (pad_removed_cb), self);
g_signal_connect (self->demux, "no-more-pads",
G_CALLBACK (no_more_pads_cb), self);
gst_bin_add_many (GST_BIN_CAST (self), self->src, self->demux, NULL);
gst_element_link_pads (self->src, "src", self->demux, "sink");
}
break;
default:
break;
}
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:{
GstIterator *it;
it = gst_element_iterate_src_pads (GST_ELEMENT_CAST (self));
while (gst_iterator_foreach (it, remove_pad, self) == GST_ITERATOR_RESYNC)
gst_iterator_resync (it);
gst_iterator_free (it);
if (self->src) {
gst_bin_remove (GST_BIN_CAST (self), self->src);
self->src = NULL;
}
if (self->demux) {
gst_bin_remove (GST_BIN_CAST (self), self->demux);
self->demux = NULL;
}
break;
}
case GST_STATE_CHANGE_READY_TO_PAUSED:
if (ret != GST_STATE_CHANGE_FAILURE)
ret = GST_STATE_CHANGE_NO_PREROLL;
if (self->sdp_buffer) {
if (gst_app_src_push_buffer (GST_APP_SRC_CAST (self->src),
gst_buffer_ref (self->sdp_buffer)) != GST_FLOW_OK)
ret = GST_STATE_CHANGE_FAILURE;
else
gst_app_src_end_of_stream (GST_APP_SRC_CAST (self->src));
}
break;
default:
break;
}
return ret;
}
static void
gst_sdp_src_class_init (GstSdpSrcClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *element_class = (GstElementClass *) klass;
GST_DEBUG_CATEGORY_INIT (sdp_src_debug, "sdpsrc", 0, "SDP Source");
gobject_class->finalize = gst_sdp_src_finalize;
gobject_class->set_property = gst_sdp_src_set_property;
gobject_class->get_property = gst_sdp_src_get_property;
g_object_class_install_property (gobject_class, PROP_LOCATION,
g_param_spec_string ("location",
"Location",
"URI to SDP file (sdp:///path/to/file)", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SDP,
g_param_spec_string ("sdp",
"SDP",
"SDP description used instead of location", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
gst_element_class_set_static_metadata (element_class, "SDP Source",
"Source/Network/RTP",
"Stream RTP based on an SDP",
"Sebastian Dröge <sebastian@centricular.com>");
element_class->change_state = GST_DEBUG_FUNCPTR (gst_sdp_src_change_state);
}
static void
gst_sdp_src_init (GstSdpSrc * self)
{
}
static GstURIType
gst_sdp_src_get_uri_type (GType type)
{
return GST_URI_SRC;
}
static const gchar *const *
gst_sdp_src_get_protocols (GType type)
{
static const gchar *protocols[] = { "sdp", 0 };
return protocols;
}
static gchar *
gst_sdp_src_get_uri (GstURIHandler * handler)
{
gchar *uri = NULL;
g_object_get (handler, "location", &uri, NULL);
return uri;
}
static gboolean
gst_sdp_src_set_uri (GstURIHandler * handler, const gchar * uri,
GError ** error)
{
if (uri && !g_str_has_prefix (uri, "sdp://")) {
g_set_error (error, GST_URI_ERROR, GST_URI_ERROR_BAD_URI,
"Invalid SDP URI");
return FALSE;
}
g_object_set (handler, "location", uri, NULL);
return TRUE;
}
static void
gst_sdp_src_handler_init (gpointer g_iface, gpointer iface_data)
{
GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;
iface->get_type = gst_sdp_src_get_uri_type;
iface->get_protocols = gst_sdp_src_get_protocols;
iface->get_uri = gst_sdp_src_get_uri;
iface->set_uri = gst_sdp_src_set_uri;
}

62
gst/sdp/gstsdpsrc.h Normal file
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@ -0,0 +1,62 @@
/* GStreamer
* Copyright (C) 2016 Sebastian Dröge <sebastian@centricular.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.
*/
#ifndef __GST_SDP_SRC_H__
#define __GST_SDP_SRC_H__
#include <gst/gst.h>
G_BEGIN_DECLS
#define GST_TYPE_SDP_SRC \
(gst_sdp_src_get_type())
#define GST_SDP_SRC(obj) \
(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_SDP_SRC, GstSdpSrc))
#define GST_SDP_SRC_CAST(obj) \
((GstSdpSrc *) obj)
#define GST_SDP_SRC_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_SDP_SRC, GstSdpSrcClass))
#define GST_IS_SDP_SRC(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_SDP_SRC))
#define GST_IS_SDP_SRC_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_SDP_SRC))
typedef struct _GstSdpSrc GstSdpSrc;
typedef struct _GstSdpSrcClass GstSdpSrcClass;
struct _GstSdpSrc
{
GstBin parent;
gchar *location;
gchar *sdp;
GstBuffer *sdp_buffer;
GstElement *src;
GstElement *demux;
};
struct _GstSdpSrcClass
{
GstBinClass parent;
};
GType gst_sdp_src_get_type (void);
G_END_DECLS
#endif /* __GST_SDP_SRC_H__ */