[gst-devel] Play audio filled in buffer

[Stefan Kost]

hi,
Akbar Basha schrieb:
> Hi Stefan,
> 
> Thanks for the response .

Would you please post to the list.
> 
> I tried the same. But could not produce the result.
> 
> Please find the code.
> 
> static void
> cb_handoff (GstElement *fakesrc,
>         GstBuffer  *buffer,
>          gpointer    user_data)
> {
>  
>   /* Clip start and end */
> 
>   data = (guint8 *) g_malloc (3000);
>   GST_BUFFER_SIZE (buffer) = 3000;
>   GST_BUFFER_DATA (buffer) = GST_BUFFER_MALLOCDATA (buffer) = data;
>    
>   FILE* fp = fopen("vertigo.mp3","rb");
>   if(fp == NULL)
>    {
>     printf( " File is not opened \n");
>     return;
>    }
>   fread(data,3000,1,fp);
>  
>   fclose(fp);
>  
> }
> 
> gint
> main (gint   argc,
>       gchar *argv[])
> {
>   GstElement *pipeline, *fakesrc, *flt, *conv, *audiosink;
>   GMainLoop *loop;
> 
>   /* init GStreamer */
>   gst_init (&argc, &argv);
>   loop = g_main_loop_new (NULL, FALSE);
> 
>   /* setup pipeline */
>   pipeline = gst_pipeline_new ("pipeline");
>   fakesrc = gst_element_factory_make ("fakesrc", "source");
>   flt = gst_element_factory_make ("capsfilter", "flt");
>   conv = gst_element_factory_make ("mad", "conv");
>   audiosink = gst_element_factory_make ("alsasink", "audiosink");
> 
>   /* setup */
>   g_object_set (G_OBJECT (flt), "caps",
>           gst_caps_new_simple("audio/x-raw-int",
>                 "channels", G_TYPE_INT, 2,
>                 "rate", G_TYPE_INT, 32000,
>                "depth", G_TYPE_INT, 16, NULL), NULL);

This is obviously wrong. You load an mp3 and not raw audio data. The capsfilter 
needs to tell that. But in your case you would not even need one.

> 
>   gst_bin_add_many (GST_BIN (pipeline), fakesrc, flt,conv, audiosink, NULL);
>   gst_element_link_many (fakesrc, flt,conv, audiosink, NULL);
> 
>   /* setup fake source */
>   g_object_set (G_OBJECT (fakesrc),"signal-handoffs", TRUE,NULL);
> 
>   g_signal_connect (fakesrc, "handoff", G_CALLBACK (cb_handoff), NULL);
> 
>   /* play */
>   gst_element_set_state (pipeline, GST_STATE_PLAYING);
>   g_main_loop_run (loop);
> 
>   /* clean up */
>   gst_element_set_state (pipeline, GST_STATE_NULL);
>   gst_object_unref (GST_OBJECT (pipeline));
> 
>   return 0;
> }
> 
> Even if I set using memset . Audio is not coming.

What happens?

Stefan

> 
> how to proceed in the case pad is required  i.e for wav files.
> 
> Regards,
> Akbar
> 
> On Wed, Jul 9, 2008 at 11:53 PM, Stefan Kost <ensonic at hora-obscura.de 
> <mailto:ensonic at hora-obscura.de>> wrote:
> 
>     Akbar Basha schrieb:
> 
>         Hi,
> 
>         I would like to play the buffer , which is filled with any audio
>         file data.
>         Does gstreamer provides any mechanism to play.
> 
> 
>     if you have the whole bufer in memory, use a fakesrc with
>     signal-handoffs=TRUE and connect to handoff signal. In the handoff
>     signal you put the pointer to your data into the GST_BUFFER_DATA,
>     set the correct GST_BUFFER_SIZE and clear GST_BUFFER_MALLOC_DATA (if
>     it was previously set g_free() the previous content).
> 
>     You should used a capsfilter after fakesrc and set the format of
>     your sample on the capsfilter caps.
> 
>     Its sort of a hack, but works fine.
> 
>     Stefan
> 
> 
>         Thanks in advance.
> 
>         Regards,
>         Akbar
> 
> 
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