Get image from mp3 id3 tags

[Tim-Philipp Müller]

On Fri, 2013-08-02 at 15:35 -0700, svalente wrote:

> Is it possible to use the gstreamer C API to extract the image (APIC tag)
> from an mp3 file's id3 tags? I don't necessarily want to display the image.
> I mostly want the data.

Sure.

> It appears that gst_tag_list_get_string_index() can't do it, since that
> returns a UTF-8-encoded, null-terminated string. I don't see any function
> that returns raw data.

That's because those image tags are GstSamples (GstBuffers in 0.10). You
need to use

  const GValue *val;
  GstSample *sample;
  GstBuffer *buffer;

  val = gst_tag_list_get_value*(..)
  sample = g_value_get_boxed (val);
  buffer = gst_sample_get_buffer (sample);
  ...

or in 0.10:

  const GValue *val;
  GstBuffer *buffer;

  val = gst_tag_list_get_value*(..)
  buffer = gst_value_get_buffer (val);
  ...

You can find some code to turn the images into e.g. GdkPixbufs in totem
(bacon-video-widget*c).

Cheers
 -Tim