Commit 91ed298b authored by Seungha Yang's avatar Seungha Yang 🐑

examples: Add an uridecodebin3 example

Demonstrate a way to select multiple streams

Part-of: <!880>
parent 89c66361
foreach example : ['decodebin3', 'playbin-test']
foreach example : ['decodebin3', 'playbin-test', 'uridecodebin3-select-all']
executable(example, '@0@.c'.format(example),
c_args : gst_plugins_base_args,
include_directories: [configinc, libsinc],
......
/* sample application for testing decodebin3
*
* Copyright (C) 2015 Centricular Ltd
* @author: Edward Hervey <edward@centricular.com>
* Copyright (C) 2020 Seungha Yang <seungha@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 <glib.h>
#include <glib-object.h>
#include <glib/gprintf.h>
#include <gst/gst.h>
/* Global structure */
typedef struct _AppData
{
GMainLoop *mainloop;
GstElement *pipeline;
GstElement *decodebin;
/* Current collection */
GstStreamCollection *collection;
guint notify_id;
} AppData;
static void
print_tag_foreach (const GstTagList * tags, const gchar * tag,
gpointer user_data)
{
GValue val = { 0, };
gchar *str;
gint depth = GPOINTER_TO_INT (user_data);
if (!gst_tag_list_copy_value (&val, tags, tag))
return;
if (G_VALUE_HOLDS_STRING (&val))
str = g_value_dup_string (&val);
else
str = gst_value_serialize (&val);
gst_print ("%*s%s: %s\n", 2 * depth, " ", gst_tag_get_nick (tag), str);
g_free (str);
g_value_unset (&val);
}
static void
dump_collection (GstStreamCollection * collection)
{
guint i;
GstTagList *tags;
GstCaps *caps;
for (i = 0; i < gst_stream_collection_get_size (collection); i++) {
GstStream *stream = gst_stream_collection_get_stream (collection, i);
gst_print (" Stream %u type %s flags 0x%x\n", i,
gst_stream_type_get_name (gst_stream_get_stream_type (stream)),
gst_stream_get_stream_flags (stream));
gst_print (" ID: %s\n", gst_stream_get_stream_id (stream));
caps = gst_stream_get_caps (stream);
if (caps) {
gchar *caps_str = gst_caps_to_string (caps);
gst_print (" caps: %s\n", caps_str);
g_free (caps_str);
gst_caps_unref (caps);
}
tags = gst_stream_get_tags (stream);
if (tags) {
gst_print (" tags:\n");
gst_tag_list_foreach (tags, print_tag_foreach, GUINT_TO_POINTER (3));
gst_tag_list_unref (tags);
}
}
}
static gboolean
activate_all_av_streams (AppData * data)
{
guint i, num_streams;
gint num_videos = 0, num_audios = 0, num_texts = 0, num_unknowns = 0;
GList *streams = NULL;
GstEvent *event;
gboolean ret;
num_streams = gst_stream_collection_get_size (data->collection);
for (i = 0; i < num_streams; i++) {
GstStream *stream = gst_stream_collection_get_stream (data->collection, i);
GstStreamType stype = gst_stream_get_stream_type (stream);
if (stype == GST_STREAM_TYPE_VIDEO) {
streams = g_list_append (streams,
(gchar *) gst_stream_get_stream_id (stream));
num_videos++;
} else if (stype == GST_STREAM_TYPE_AUDIO) {
streams = g_list_append (streams,
(gchar *) gst_stream_get_stream_id (stream));
num_audios++;
} else if (stype == GST_STREAM_TYPE_TEXT) {
num_texts++;
} else {
/* Unknown, container or complex type */
num_unknowns++;
}
}
gst_println ("Have %d streams (video: %d, audio: %d, text: %d, unknown %d)",
num_streams, num_videos, num_audios, num_texts, num_unknowns);
if (!num_videos && !num_audios) {
gst_println ("No AV stream to expose");
return FALSE;
}
event = gst_event_new_select_streams (streams);
ret = gst_element_send_event (data->decodebin, event);
gst_println ("Sent select-streams event ret %d", ret);
return TRUE;
}
static void
stream_notify_cb (GstStreamCollection * collection, GstStream * stream,
GParamSpec * pspec, guint * val)
{
gst_print ("Got stream-notify from stream %s for %s (collection %p)\n",
stream->stream_id, pspec->name, collection);
if (g_str_equal (pspec->name, "caps")) {
GstCaps *caps = gst_stream_get_caps (stream);
gchar *caps_str = gst_caps_to_string (caps);
gst_print (" New caps: %s\n", caps_str);
g_free (caps_str);
gst_caps_unref (caps);
}
}
static GstBusSyncReply
_on_bus_message (GstBus * bus, GstMessage * message, AppData * data)
{
GstObject *src = GST_MESSAGE_SRC (message);
switch (GST_MESSAGE_TYPE (message)) {
case GST_MESSAGE_ERROR:{
GError *err = NULL;
gchar *name = gst_object_get_path_string (GST_MESSAGE_SRC (message));
gst_message_parse_error (message, &err, NULL);
gst_printerr ("ERROR: from element %s: %s\n", name, err->message);
g_error_free (err);
g_free (name);
gst_println ("Stopping");
g_main_loop_quit (data->mainloop);
break;
}
case GST_MESSAGE_EOS:
gst_println ("EOS ! Stopping");
g_main_loop_quit (data->mainloop);
break;
case GST_MESSAGE_STREAM_COLLECTION:
{
GstStreamCollection *collection = NULL;
gst_message_parse_stream_collection (message, &collection);
if (collection) {
/* Replace stream collection with new one */
gst_println ("Got a collection from %s",
src ? GST_OBJECT_NAME (src) : "Unknown");
dump_collection (collection);
if (data->collection && data->notify_id) {
g_signal_handler_disconnect (data->collection, data->notify_id);
data->notify_id = 0;
}
gst_object_replace ((GstObject **) & data->collection,
(GstObject *) collection);
if (data->collection) {
data->notify_id =
g_signal_connect (data->collection, "stream-notify",
(GCallback) stream_notify_cb, data);
}
/* Try to expose all audio/video streams */
if (!activate_all_av_streams (data))
g_main_loop_quit (data->mainloop);
}
break;
}
default:
break;
}
return GST_BUS_PASS;
}
static void
decodebin_pad_added_cb (GstElement * dbin, GstPad * pad, AppData * data)
{
gchar *pad_name = gst_pad_get_name (pad);
GstStream *stream;
GstStreamType type;
gst_println ("New pad %s added, try linking with sink", pad_name);
g_free (pad_name);
stream = gst_pad_get_stream (pad);
if (!stream) {
g_error ("New pad was exposed without GstStream object");
g_main_loop_quit (data->mainloop);
return;
}
type = gst_stream_get_stream_type (stream);
switch (type) {
case GST_STREAM_TYPE_VIDEO:{
GstElement *queue;
GstElement *convert;
GstElement *sink;
GstPad *sinkpad;
queue = gst_element_factory_make ("queue", NULL);
if (!queue) {
gst_println ("queue element is unavailable");
g_main_loop_quit (data->mainloop);
return;
}
gst_bin_add (GST_BIN_CAST (data->pipeline), queue);
convert = gst_element_factory_make ("videoconvert", NULL);
if (!convert) {
gst_println ("videoconvert element is unavailable");
goto error;
}
gst_bin_add (GST_BIN_CAST (data->pipeline), convert);
sink = gst_element_factory_make ("autovideosink", NULL);
if (!sink) {
gst_println ("autovideosink element is unavailable");
goto error;
}
gst_bin_add (GST_BIN_CAST (data->pipeline), sink);
sinkpad = gst_element_get_static_pad (queue, "sink");
gst_pad_set_active (sinkpad, TRUE);
gst_element_link_many (queue, convert, sink, NULL);
gst_pad_link (pad, sinkpad);
gst_object_unref (sinkpad);
gst_element_sync_state_with_parent (queue);
gst_element_sync_state_with_parent (convert);
gst_element_sync_state_with_parent (sink);
break;
}
case GST_STREAM_TYPE_AUDIO:{
GstElement *queue;
GstElement *convert;
GstElement *resample;
GstElement *sink;
GstPad *sinkpad;
queue = gst_element_factory_make ("queue", NULL);
if (!queue) {
gst_println ("queue element is unavailable");
goto error;
}
gst_bin_add (GST_BIN_CAST (data->pipeline), queue);
convert = gst_element_factory_make ("audioconvert", NULL);
if (!convert) {
gst_println ("audioconvert element is unavailable");
goto error;
}
gst_bin_add (GST_BIN_CAST (data->pipeline), convert);
resample = gst_element_factory_make ("audioresample", NULL);
if (!resample) {
gst_println ("audioresample element is unavailable");
goto error;
}
gst_bin_add (GST_BIN_CAST (data->pipeline), resample);
sink = gst_element_factory_make ("autoaudiosink", NULL);
if (!sink) {
gst_println ("autoaudiosink element is unavailable");
goto error;
}
gst_bin_add (GST_BIN_CAST (data->pipeline), sink);
sinkpad = gst_element_get_static_pad (queue, "sink");
gst_pad_set_active (sinkpad, TRUE);
gst_element_link_many (queue, convert, resample, sink, NULL);
gst_pad_link (pad, sinkpad);
gst_object_unref (sinkpad);
gst_element_sync_state_with_parent (queue);
gst_element_sync_state_with_parent (convert);
gst_element_sync_state_with_parent (resample);
gst_element_sync_state_with_parent (sink);
break;
}
default:
gst_println ("Ignore non video/audio stream %s (0x%x)",
gst_stream_type_get_name (type), type);
break;
}
gst_object_unref (stream);
return;
error:
gst_object_unref (stream);
g_main_loop_quit (data->mainloop);
return;
}
int
main (int argc, gchar ** argv)
{
GstBus *bus;
AppData *data;
gst_init (&argc, &argv);
if (argc < 2) {
gst_print ("Usage: uridecodebin3 URI\n");
return 1;
}
data = g_new0 (AppData, 1);
data->pipeline = gst_pipeline_new ("pipeline");
data->decodebin = gst_element_factory_make ("uridecodebin3", NULL);
g_object_set (data->decodebin, "uri", argv[1], NULL);
gst_bin_add (GST_BIN_CAST (data->pipeline), data->decodebin);
g_signal_connect (data->decodebin, "pad-added",
(GCallback) decodebin_pad_added_cb, data);
data->mainloop = g_main_loop_new (NULL, FALSE);
/* Put a bus handler */
bus = gst_pipeline_get_bus (GST_PIPELINE (data->pipeline));
gst_bus_set_sync_handler (bus, (GstBusSyncHandler) _on_bus_message, data,
NULL);
/* Start pipeline */
gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
g_main_loop_run (data->mainloop);
gst_element_set_state (data->pipeline, GST_STATE_NULL);
gst_object_unref (data->pipeline);
gst_clear_object (&data->collection);
gst_object_unref (bus);
g_free (data);
return 0;
}
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