gstreamer code for playing avi file is hanging
johnw
john.willy52 at gmail.com
Mon Dec 5 23:14:25 PST 2011
I am new to gstremaer. I have written a code for playing avi file using
gstreamer. But on executing the code it just hangs after a while, I am
unable to debug whats the problem, Can someone help me please. The code and
the output is as below:
Code:
#include<stdio.h>
#include<gst/gst.h>
#include<glib.h>
//Function to process message on bus of pipeline
gboolean process_message(GstBus *bus, GstMessage *msg,gpointer data);
//Function to add pad dynamically for ogg demux
void dynamic_addpad(GstElement *element, GstPad *pad, gpointer data);
void dynamic_decodepad (GstElement* object, GstPad* arg0, gboolean
arg1,gpointer user_data);
GstElement *source, *demuxer, *audio_decoder, *video_decoder,
*audio_convertor,*video_convertor,
*audio_sink,*video_sink,*audioqueue,*videoqueue;//*audio_demuxer,
*video_demuxer,
int main(int argc,char* argv[])
{
GstPipeline *pipeline;
GstBin *Bin;
GstBus *bus;
GMainLoop *Mainloop;
gst_init (&argc,&argv);
Mainloop = g_main_loop_new(NULL,FALSE);//NULL to use the current
context and False to tell its not in running state
pipeline = gst_pipeline_new("PIPELINE");
Bin = GST_BIN(pipeline);
bus = gst_pipeline_get_bus(pipeline);
source = gst_element_factory_make("filesrc","file-source");
g_object_set(G_OBJECT(source),"location",argv[1],NULL);
demuxer = gst_element_factory_make("avidemux","avi-demuxer");
audioqueue = gst_element_factory_make("queue","Queue for audio");
videoqueue = gst_element_factory_make("queue","Queue for video");
video_decoder =
gst_element_factory_make("decodebin","decoderbin");//"Vorbis audio
decoder","vorbis");
audio_convertor = gst_element_factory_make("audioconvert","audio
convertor");//"Audio converter","audioconvert");
video_convertor = gst_element_factory_make("videoscale","video
convertor");//"Audio converter","audioconvert");
audio_sink = gst_element_factory_make("autoaudiosink","Auto audio
sink");
video_sink = gst_element_factory_make("xvimagesink","XV video sink ");
if(!source || !demuxer || !audioqueue || !videoqueue || !video_decoder
||!audio_convertor || !video_convertor || !audio_sink || !video_sink )
{ g_print("Could not not create element\n");
return 0;
}
gst_bin_add(Bin,source);
gst_bin_add_many(Bin,demuxer,audioqueue,videoqueue,audio_convertor,video_decoder,video_convertor,audio_sink,video_sink,NULL);
gst_element_link(source,demuxer);
gst_element_link_many(audioqueue,video_decoder,audio_convertor,audio_sink,NULL);
gst_element_link_many(videoqueue,video_decoder,video_convertor,video_sink,NULL);
g_signal_connect(demuxer,"pad-added",G_CALLBACK(dynamic_addpad),NULL);//demuxer
and decoder are passed as instance and data as pads of both the elements are
linked in dynamic_addpad
g_signal_connect(video_decoder,"new-decoded-pad",G_CALLBACK(dynamic_decodepad),NULL);//demuxer
and decoder are passed as instance and data as pads of both the elements are
linked in dynamic_addpad
gst_bus_add_watch(bus,process_message,Mainloop); //Mainloop is passed
as user data as in the process_message actions are taken on the loop
g_object_unref(bus);
g_print("In playing state\n");
gst_element_set_state(pipeline,GST_STATE_PLAYING);//Pipeline is also a
bin and bin is also an element at abstract level and hence
gst_element_set_state call is used to set state of pipeline.
g_main_loop_run(Mainloop);
g_print("In playing state2\n");
gst_element_set_state(pipeline,GST_STATE_NULL);
g_object_unref(G_OBJECT(pipeline));
}
//Function to process message on bus of pipeline
gboolean process_message(GstBus *bus, GstMessage *msg,gpointer data)
{
GError *error;
gchar *debug;
GMainLoop *loop = (GMainLoop *)data;
g_print(" In process message msg->type : %d\n",GST_MESSAGE_TYPE(msg));
switch(GST_MESSAGE_TYPE(msg))
{
case GST_MESSAGE_UNKNOWN :
g_print("GST_MESSAGE_UNKNOWN \n");
break;
case GST_MESSAGE_EOS :
g_print("GST_MESSAGE_EOS \n");
g_main_loop_quit(loop);
break;
case GST_MESSAGE_ERROR :
g_print("GST_MESSAGE_ERROR \n");
gst_message_parse_error (msg, &error, &debug);
g_free(debug);
//if(!error)
{
g_print("GST_MESSAGE_ERROR message : %s
\n",error->message);
}
g_main_loop_quit(loop);
break;
case GST_MESSAGE_WARNING :
g_print("GST_MESSAGE_WARNING \n");
break;
case GST_MESSAGE_INFO :
g_print("GST_MESSAGE_INFO \n");
break;
case GST_MESSAGE_TAG :
g_print("GST_MESSAGE_TAG \n");
break;
case GST_MESSAGE_BUFFERING:
g_print("GST_MESSAGE_BUFFERING \n");
break;
case GST_MESSAGE_STATE_CHANGED:
g_print("GST_MESSAGE_STATE_CHANGED \n");
break;
default :
g_print("default \n");
break;
}
return TRUE; //returns true always as it has to be always registered
returning false will deregister the function
}
//Function to add pad dynamically for ogg demux
void dynamic_addpad(GstElement *element, GstPad *pad, gpointer data)
{
GstPad *audiodemuxsink;
GstPad *videodemuxsink;
GstElement *decoder = (GstElement *)data;
g_print(" In dynamic ADDING PAD\n");
audiodemuxsink = gst_element_get_static_pad(audioqueue,"sink");
gst_pad_link(pad,audiodemuxsink );
videodemuxsink = gst_element_get_static_pad(videoqueue,"sink");
gst_pad_link(pad,videodemuxsink );
g_print(" In dynamic ADDING PAD2\n");
}
void dynamic_decodepad (GstElement* object, GstPad* pad, gboolean
arg1,gpointer user_data)
{
GstPad *videoconvertsink;
GstPad *audioconvertsink ;
g_print(" In dynamic_decodepad ADDING PAD\n");
videoconvertsink = gst_element_get_static_pad(video_convertor,"sink");
gst_pad_link(pad,videoconvertsink);
audioconvertsink =
gst_element_get_static_pad(audio_convertor,"sink");
gst_pad_link(pad,audioconvertsink );
g_print(" In dynamic_decodepad ADDING PAD2\n");
}
Output:
In playing state
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 8192
default
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 8192
default
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 8192
default
In process message msg->type : 8192
default
In dynamic ADDING PAD
In dynamic ADDING PAD2
In dynamic ADDING PAD
In dynamic ADDING PAD2
In process message msg->type : 16
GST_MESSAGE_TAG
In process message msg->type : 16
GST_MESSAGE_TAG
In process message msg->type : 16
GST_MESSAGE_TAG
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In dynamic_decodepad ADDING PAD
In dynamic_decodepad ADDING PAD2
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
In process message msg->type : 64
GST_MESSAGE_STATE_CHANGED
It hangs at this point.
Any help is appreciated.
Thanks in advance.
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