Audio Metadata

[Sree Gowri]

On Mon, Apr 16, 2012 at 12:53 AM, Stefan Sauer <ensonic at hora-obscura.de>wrote:

> **
> 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
>
>       Hi stephan,

      First would like to thank you for the input you provided.

      I tried both the pipelines that you have mentioned,however meta data
has not been    extracted.

     Kindly request you to let me know if there are any other changes that
needs to be done.

Regards,
Sree Gowri


>
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