Audio Metadata

[Stefan Sauer]

On 04/12/2012 06:23 AM, Sree Gowri wrote:
> Hi,
>
> I am trying to extract audio metadata like
> streamurl,streamtitle,artist,genre,album.However I am not able to
> extract the metadata using GstTagList. Below is the snippet of the
> code. Does anyone suggest what are the additions to be done in order
> to extract the metadata?
>
> Only the following data has been extracted.
>              layer: 3
>              mode: joint
>              emphasis: none
>              audio codec: MPEG-1 layer 3
>              bitrate: 128000
>
> Pipeline is as follows:
>
> [code]
> app->pipeline= gst_parse_launch("appsrc name=mysource ! audio/mpeg  !
> mad !  alsasink", NULL);
> [/code]
"appsrc name=mysource ! audio/mpeg  ! mp3parse ! mad !  alsasink"
or even better
"appsrc name=mysource ! audio/mpeg  ! decodebin2!  alsasink"

Stefan

>
> Audio data fed to the appsrc element
>
> [code]
> buf =( GstBuffer *) gst_app_buffer_new (data, READBUF, g_free, data);
> g_signal_emit_by_name (GST_APP_SRC (app->appsrc), "push-buffer", buf,
> &ret);
> [/code]
>
> Bus message
>
> [code]
> case GST_MESSAGE_TAG:
> {
>     GstTagList *tags = NULL;
>         char *artist;
>         gst_message_parse_tag (message, &tags);
>         g_print ("Got tags from element %s:\n", GST_OBJECT_NAME
> (message->src));
>         if (gst_tag_list_get_string (tags, GST_TAG_ARTIST, &artist))
>         {
>            printf("got artist: %s\n",artist);
>         }
>         else
>         {
>           printf("no artist!! \n");
>         }
>         gst_tag_list_foreach (tags, print_tag, NULL);
>         g_print ("\n");
>         gst_tag_list_free (tags);
>         break;
> [/code]
>
> print_tag function code
> [code]
> static void print_tag (const GstTagList * list, const gchar * tag,
> gpointer unused)
> {
>   gint i, count;
>   count = gst_tag_list_get_tag_size (list, tag);
>   for (i = 0; i < count; i++) {
>     gchar *str;
>     if (gst_tag_get_type (tag) == G_TYPE_STRING) {
>       if (!gst_tag_list_get_string_index (list, tag, i, &str))
>         g_assert_not_reached ();
>  
>     } else {
>       str =
>           g_strdup_value_contents (gst_tag_list_get_value_index (list,
> tag, i));
>     }
>     if (i == 0) {
>       g_print ("  %15s: %s\n", gst_tag_get_nick (tag), str);
>     } else {
>       g_print ("                 : %s\n", str);
>     }
>     g_free (str);
>   }
> }
> [/code]
>
> Thanks and Regards,
> Sree Gowri
>
>
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> gstreamer-devel at lists.freedesktop.org
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