Playbin issue by using gstplayflags
pc_zhu
pc_zhu at realsil.com.cn
Tue May 16 07:46:56 UTC 2017
I am using Playbin(gstreamer) to play rtsp://…,and I want to disable or
enable audio when playing the living stream, so need to set the
Gstplayflags.
Now the current situation :
1. For aac format : I can disable & enable audio successfully .
2. For g726, g711-mulaw, g711-alaw : Can not swtich successfully, but If I
set audio & video flags first ,it has sound out. In addition, when playing
the filesrc(file://...), I can disable & enable audio successfully too.
I have no idea about how to do, so ask for help, thanks!!!
This is my C code: Based on
https://gstreamer.freedesktop.org/documentation/tutorials/playback/playbin-usage.html
#include <gst/gst.h>
#include <stdio.h>
#include <unistd.h>
#define MAX_INSTANCE 1
/* Structure to contain all our information, so we can pass it around */
typedef struct _CustomData {
GstElement *playbin; /* Our one and only element */
GstElement *decode, *audioParser, *multiqueue;
gint n_video; /* Number of embedded video streams */
gint n_audio; /* Number of embedded audio streams */
gint n_text; /* Number of embedded subtitle streams */
GstElement *video_sink;
gint current_video; /* Currently playing video stream */
gint current_audio; /* Currently playing audio stream */
gint current_text; /* Currently playing subtitle stream */
GstBus *bus;
//gint flags;
GstStateChangeReturn ret;
GMainLoop *main_loop; /* GLib's Main Loop */
} CustomData;
/* playbin flags */
typedef enum {
GST_PLAY_FLAG_VIDEO = (1 << 0), /* We want video output */
GST_PLAY_FLAG_AUDIO = (1 << 1), /* We want audio output */
GST_PLAY_FLAG_TEXT = (1 << 2) /* We want subtitle output */
} GstPlayFlags;
/* Forward definition for the message and keyboard processing functions */
static gboolean handle_message (GstBus *bus, GstMessage *msg, CustomData
*data);
static gboolean handle_keyboard (GIOChannel *source, GIOCondition cond);
CustomData data[MAX_INSTANCE];
GIOChannel *io_stdin;
int main(int argc, char *argv[]) {
gint flags;
/* Initialize GStreamer */
gst_init (&argc, &argv);
int i;
/* Create the elements */
for(i=0; i<MAX_INSTANCE; i++)
{
data[i].playbin = gst_element_factory_make ("playbin",
"playbin");
if (!data[i].playbin) {
g_printerr ("Not all elements could be created.\n");
return -1;
}
/* Set the URI to play */
g_object_set (data[i].playbin, "uri",
"rtsp://192.168.0.100:43794/profile1", NULL);
/* Set flags to show Audio and Video but ignore Subtitles */
g_object_get (data[i].playbin, "flags", &flags, NULL);
g_print("flags0:%d\n",flags);
flags &= ~GST_PLAY_FLAG_AUDIO;
g_object_set (data[i].playbin, "flags", flags, NULL);
g_print("flags0:%d\n",flags);
/* Add a bus watch, so we get notified when a message arrives */
data[i].bus = gst_element_get_bus (data[i].playbin);
gst_bus_add_watch (data[i].bus, (GstBusFunc)handle_message, &data[i]);
/* Start playing */
data[i].ret = gst_element_set_state (data[i].playbin, GST_STATE_PLAYING);
if (data[i].ret == GST_STATE_CHANGE_FAILURE) {
g_printerr ("Unable to set the pipeline to the playing
state.\n");
gst_object_unref (data[i].playbin);
return -1;
}
}
/* Add a keyboard watch so we get notified of keystrokes */
#ifdef G_OS_WIN32
io_stdin = g_io_channel_win32_new_fd (fileno (stdin));
#else
io_stdin = g_io_channel_unix_new (fileno (stdin));
#endif
g_io_add_watch (io_stdin, G_IO_IN, (GIOFunc)handle_keyboard, NULL);
for(i=0; i<MAX_INSTANCE; i++){
/* Create a GLib Main Loop and set it to run */
data[i].main_loop = g_main_loop_new (NULL, FALSE);
g_main_loop_run (data[i].main_loop);
}
return 0;
}
static void Free_resources (CustomData *data) {
g_main_loop_unref (data->main_loop);
gst_object_unref (data->bus);
gst_element_set_state (data->playbin, GST_STATE_NULL);
gst_object_unref (data->playbin);
}
/* Extract some metadata from the streams and print it on the screen */
/*
static void analyze_streams (CustomData *data) {
gint i;
GstTagList *tags;
gchar *str;
guint rate;
/* Read some properties */
/*
g_object_get (data->playbin, "n-video", &data->n_video, NULL);
g_object_get (data->playbin, "n-audio", &data->n_audio, NULL);
g_object_get (data->playbin, "n-text", &data->n_text, NULL);
g_print ("%d video stream(s), %d audio stream(s), %d text stream(s)\n",
data->n_video, data->n_audio, data->n_text);
g_print ("\n");
for (i = 0; i < data->n_video; i++) {
tags = NULL;
/* Retrieve the stream's video tags */
/*
g_signal_emit_by_name (data->playbin, "get-video-tags", i, &tags);
if (tags) {
g_print ("video stream %d:\n", i);
gst_tag_list_get_string (tags, GST_TAG_VIDEO_CODEC, &str);
g_print (" codec: %s\n", str ? str : "unknown");
g_free (str);
gst_tag_list_free (tags);
}
}
g_print ("\n");
for (i = 0; i < data->n_audio; i++) {
tags = NULL;
/* Retrieve the stream's audio tags */
/*
g_signal_emit_by_name (data->playbin, "get-audio-tags", i, &tags);
if (tags) {
g_print ("audio stream %d:\n", i);
if (gst_tag_list_get_string (tags, GST_TAG_AUDIO_CODEC, &str)) {
g_print (" codec: %s\n", str);
g_free (str);
}
if (gst_tag_list_get_string (tags, GST_TAG_LANGUAGE_CODE, &str)) {
g_print (" language: %s\n", str);
g_free (str);
}
if (gst_tag_list_get_uint (tags, GST_TAG_BITRATE, &rate)) {
g_print (" bitrate: %d\n", rate);
}
gst_tag_list_free (tags);
}
}
g_print ("\n");
for (i = 0; i < data->n_text; i++) {
tags = NULL;
/* Retrieve the stream's subtitle tags */
/*
g_signal_emit_by_name (data->playbin, "get-text-tags", i, &tags);
if (tags) {
g_print ("subtitle stream %d:\n", i);
if (gst_tag_list_get_string (tags, GST_TAG_LANGUAGE_CODE, &str)) {
g_print (" language: %s\n", str);
g_free (str);
}
gst_tag_list_free (tags);
}
}
g_object_get (data->playbin, "current-video", &data->current_video, NULL);
g_object_get (data->playbin, "current-audio", &data->current_audio, NULL);
g_object_get (data->playbin, "current-text", &data->current_text, NULL);
g_print ("\n");
g_print ("Currently playing video stream %d, audio stream %d and text
stream %d\n",
data->current_video, data->current_audio, data->current_text);
g_print ("Type any number and hit ENTER to select a different audio
stream\n");
}
*/
/* Process messages from GStreamer */
static gboolean handle_message (GstBus *bus, GstMessage *msg, CustomData
*data) {
GError *err;
gchar *debug_info;
switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_ERROR:
gst_message_parse_error (msg, &err, &debug_info);
g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME
(msg->src), err->message);
g_printerr ("Debugging information: %s\n", debug_info ? debug_info :
"none");
g_clear_error (&err);
g_free (debug_info);
g_main_loop_quit (data->main_loop);
Free_resources(data);
break;
case GST_MESSAGE_EOS:
g_print ("End-Of-Stream reached.\n");
g_main_loop_quit (data->main_loop);
Free_resources(data);
break;
case GST_MESSAGE_STATE_CHANGED: {
GstState old_state, new_state, pending_state;
gst_message_parse_state_changed (msg, &old_state, &new_state,
&pending_state);
/*
if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data->playbin)) {
if (new_state == GST_STATE_PLAYING) {
/* Once we are in the playing state, analyze the streams */
/*
analyze_streams (data);
}
}*/
} break;
}
/* We want to keep receiving messages */
return TRUE;
}
/* Process keyboard input */
static gboolean handle_keyboard (GIOChannel *source, GIOCondition cond) {
gchar *str = NULL;
gint flags;
int i;
if (g_io_channel_read_line (source, &str, NULL, NULL, NULL) ==
G_IO_STATUS_NORMAL) {
int index = g_ascii_strtoull (str, NULL, 0);
if (index == 0 ) {
g_print ("Turn off audio!!!\n");
g_object_get (data[0].playbin, "flags", &flags, NULL);
g_print("flags1:%d\n",flags);
flags &= ~GST_PLAY_FLAG_AUDIO;
g_print("flags1:%d\n",flags);
g_object_set (data[0].playbin, "flags", flags, NULL);
//gst_element_set_state (data[0].playbin, GST_STATE_PLAYING);
} else {
g_print ("Turn on audio!!!\n");
g_object_get (data[0].playbin, "flags", &flags, NULL);
g_print("flags2:%d\n",flags);
flags |= GST_PLAY_FLAG_AUDIO;
g_print("flags2:%d\n",flags);
g_object_set (data[0].playbin, "flags", flags, NULL);
}
}
g_free (str);
return TRUE;
}
--
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