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vorbistag: Add support for METADATA_BLOCK_PICTURE tags

Browse source 
This is the official, standardized way of embedding pictures
inside vorbiscomments now. Parsing code taken from flacparse
and slightly changed.

Fixes bug #635669.
This commit is contained in:
Sebastian Dröge 2011-04-01 12:28:28 +02:00
parent a2532fc3f7
commit 57ff12bb0d
1 changed files with 62 additions and 0 deletions
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62
gst-libs/gst/tag/gstvorbistag.c
View file

@ -37,6 +37,7 @@
#include "config.h"
#endif
#include <gst/gsttagsetter.h>
#include <gst/base/gstbytereader.h>
#include "gsttageditingprivate.h"
#include <stdlib.h>
#include <string.h>
@ -355,6 +356,65 @@ convert_failed:
}
}
/* Standardized way of adding pictures to vorbiscomments:
* http://wiki.xiph.org/VorbisComment#METADATA_BLOCK_PICTURE
*/
static void
gst_vorbis_tag_add_metadata_block_picture (GstTagList * tags,
gchar * value, gint value_len)
{
GstByteReader reader;
guint32 img_len = 0, img_type = 0;
guint32 img_mimetype_len = 0, img_description_len = 0;
gsize decoded_len;
const guint8 *data;
/* img_data_base64 points to a temporary copy of the base64 encoded data, so
* it's safe to do inpace decoding here
*/
g_base64_decode_inplace (value, &decoded_len);
if (decoded_len == 0)
goto decode_failed;
gst_byte_reader_init (&reader, (guint8 *) value, decoded_len);
if (!gst_byte_reader_get_uint32_be (&reader, &img_type))
goto error;
if (!gst_byte_reader_get_uint32_be (&reader, &img_mimetype_len))
goto error;
if (!gst_byte_reader_skip (&reader, img_mimetype_len))
goto error;
if (!gst_byte_reader_get_uint32_be (&reader, &img_description_len))
goto error;
if (!gst_byte_reader_skip (&reader, img_description_len))
goto error;
/* Skip width, height, color depth and number of colors for
* indexed formats */
if (!gst_byte_reader_skip (&reader, 4 * 4))
goto error;
if (!gst_byte_reader_get_uint32_be (&reader, &img_len))
goto error;
if (!gst_byte_reader_get_data (&reader, img_len, &data))
goto error;
gst_tag_list_add_id3_image (tags, data, img_len, img_type);
return;
error:
GST_WARNING
("Couldn't extract image or image type from METADATA_BLOCK_PICTURE tag");
return;
decode_failed:
GST_WARNING ("Failed to decode Base64 data from METADATA_BLOCK_PICTURE tag");
return;
}
/**
* gst_tag_list_from_vorbiscomment_buffer:
* @buffer: buffer to convert
@ -433,6 +493,8 @@ gst_tag_list_from_vorbiscomment_buffer (const GstBuffer * buffer,
continue;
} else if (g_ascii_strcasecmp (cur, "COVERART") == 0) {
gst_vorbis_tag_add_coverart (list, value, value_len);
} else if (g_ascii_strcasecmp (cur, "METADATA_BLOCK_PICTURE") == 0) {
gst_vorbis_tag_add_metadata_block_picture (list, value, value_len);
} else {
gst_vorbis_tag_add (list, cur, value);
}