call to the GstBus unexpectedly stops while playing audio file....

[Stefan Kost]

Am 25.04.2011 04:13, schrieb Victor henri:
> I reply to myself:
> 
> 2 things:
> 
> 1. I was using decodebin wich tends to be deprecated now AFAIK; I've rewritten
> it with playbin2;
> 
> 2. it is solved in my new rewriting; I'm not sure how I did, but I  have noticed
> this:
> 
> I have started a new playbin2 function from scratch : it worked; then i tried to
> link it from my gtk graphical interface : it didn't work; the call to the
> function with playbin2 was direct, like that :
> 
>                g_signal_connect(G_OBJECT(pButton[0]), "clicked",
> G_CALLBACK(playbin2), NULL);
> 
> When I changed, to
> 
>               g_signal_connect(G_OBJECT(pButton[0]), "clicked",
> G_CALLBACK(onPlay), NULL);

The callback has to be a function that would call
gst_element_set_state(playbin2,GST_STATE_PLAYING);

Passing an object pointer as a callback would lead to a crasher.

Stefan

> 
> where the 'onPlay' function calls the playbin2 function, it started to work...
> but it still doesn't make sense for me.......
> 
> Victor
> 
> --------------------------------------------------------------------------------
> From: nadaeck at hotmail.com
> To: gstreamer-devel at lists.freedesktop.org
> Subject: call to the GstBus unexpectedly stops while playing audio file....
> Date: Sat, 23 Apr 2011 19:55:36 +0200
> 
> Hello
> 
> I'm playing an audio files with decodebin. This works fine but and the file is
> played, but the call to the GstBus is somehow stopped while the file is still
> beeing played, despite the bus calling function returns TRUE everytime.
> 
> I have added a 'spectrum' element since my goal is to work on harmonics analysis.
>  
> Please how could I fix this?
> 
> This is the code :
> 
> #include <stdlib.h>
> #include <stdio.h>
> #include <string.h>
> #include <gst/gst.h>
> 
> GstElement *audio;
> int counter = 0;
> GMainLoop *loop;
> 
> static void cb_newpad (GstElement *decodebin, GstPad *pad, gboolean last,
> gpointer data)
> {
>   GstCaps *caps;
>   GstStructure *str;
>   GstPad *audiopad;
> 
>   audiopad = gst_element_get_static_pad (audio, "sink");
>   if (GST_PAD_IS_LINKED (audiopad)) {
>     g_object_unref (audiopad);
>     return;
>   }
> 
>   caps = gst_pad_get_caps (pad);
>   str = gst_caps_get_structure (caps, 0);
>   if (!g_strrstr (gst_structure_get_name (str), "audio")) {
>     gst_caps_unref (caps);
>     gst_object_unref (audiopad);
>     return;
>   }
>   gst_caps_unref (caps);
> 
>   gst_pad_link (pad, audiopad);
>   g_object_unref (audiopad);
> }
> 
> static gboolean message_handler (GstBus * bus, GstMessage * message, gpointer data)
> {    
>     counter ++;
>     printf("%d\n", counter);
>     int ii = 0;
>     const GValue *magnitudes;
>             
>         if (message->type == GST_MESSAGE_ELEMENT) {
>         counter = 0;
>         const GstStructure *s = gst_message_get_structure (message);
>         const gchar *name = gst_structure_get_name (s);
>         GstClockTime endtime;
>         
>                 if (strcmp (name, "spectrum") == 0) {
>             if (!gst_structure_get_clock_time (s, "endtime", &endtime)){
>                 //endtime = GST_CLOCK_TIME_NONE;
>                 magnitudes = gst_structure_get_value (s, "magnitude");
>                 }
>             }
>         
>         }
>     else if (message->type == GST_MESSAGE_EOS) {
>         g_main_loop_quit (loop);
>         }
> return TRUE;
> }
> 
> main(int argc, char **argv)
> {
>     int AUDIOFREQ = 44100;
>     int interval = 100000000;
>     int spect_bands = 20;
>     GstElement *src, *dec, *audioconvert, *conv, *spectrum, *sink;
>     GstBus *bus;
>     GstCaps *caps;
>     GstPad *audiopad;
>     GstStateChangeReturn res;
>     GstElement *pipeline;
>     gchar *uri;
>         
>     
>     gst_init (NULL, NULL);
>     loop = g_main_loop_new(NULL, FALSE);
> 
>     pipeline = gst_pipeline_new ("pipeline");
>     bus = gst_element_get_bus (pipeline);
>     gst_bus_add_watch (bus, message_handler, loop);
>     gst_object_unref (bus);
> 
>     src = gst_element_factory_make ("filesrc", "source");
>     g_object_set (G_OBJECT (src), "location",
> "/home/victor/Music/chopin_nocturne.mp3" , NULL);
>     dec = gst_element_factory_make ("decodebin", "decoder");
>     g_signal_connect (dec, "new-decoded-pad", G_CALLBACK (cb_newpad), NULL);
>     spectrum = gst_element_factory_make ("spectrum", "spectrum");
>     g_object_set (G_OBJECT (spectrum), "bands", spect_bands, "threshold", -80,
>         "message", TRUE, "message-phase", TRUE, "interval", interval, NULL);
>     gst_bin_add_many (GST_BIN (pipeline), src, dec, NULL);
>     gst_element_link (src, dec);
> 
>     audio = gst_bin_new ("audiobin");
>     conv = gst_element_factory_make ("audioconvert", "aconv");
>     audiopad = gst_element_get_static_pad (conv, "sink");
>     sink = gst_element_factory_make ("alsasink", "sink");
>     gst_bin_add_many (GST_BIN (audio), conv, spectrum, sink, NULL);
>     gst_element_link_many (conv, spectrum, sink, NULL);
>     gst_element_add_pad (audio,
>     gst_ghost_pad_new ("sink", audiopad));
>     gst_object_unref (audiopad);
>     gst_bin_add (GST_BIN (pipeline), audio);
> 
>     gst_element_set_state (pipeline, GST_STATE_PLAYING);
>     
>     g_main_loop_run (loop);
>     gst_element_set_state (pipeline, GST_STATE_NULL);
>     gst_object_unref (GST_OBJECT (pipeline));
>                 
> }
> 
> 
> This works since the music is played (I've chosen a defined mp3 piece from my
> hard drive), but the counter that is the 'message_handler' function stops at
> '43'.....
> 
> Does anyone have a clue to help me please?
> 
> Thank you
> 
> Victor
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