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gst-libs/gst/tag/gstvorbistag.c: Retrieve COVERART tags from vorbis comments (#512333)

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Original commit message from CVS:
Based on patch by: John Millikin <jmillikin gmail com>
* gst-libs/gst/tag/gstvorbistag.c: (tag_matches), (gst_vorbis_tag_add),
(gst_vorbis_tag_add_coverart):
Retrieve COVERART tags from vorbis comments (#512333)
This commit is contained in:
John Millikin 2008-06-03 20:01:58 +00:00 committed by Tim-Philipp Müller
parent 8b491df810
commit f934d1c233
2 changed files with 90 additions and 4 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2008-06-03 Tim-Philipp Müller <tim.muller at collabora co uk>
Based on patch by: John Millikin <jmillikin gmail com>
* gst-libs/gst/tag/gstvorbistag.c: (tag_matches), (gst_vorbis_tag_add),
(gst_vorbis_tag_add_coverart):
Retrieve COVERART tags from vorbis comments (#512333)
2008-06-03 Tim-Philipp Müller <tim.muller at collabora co uk>
* gst-libs/gst/tag/tag.h:

84
gst-libs/gst/tag/gstvorbistag.c
View file

@ -86,7 +86,10 @@ static const GstTagEntryMatch tag_matches[] = {
{GST_TAG_LANGUAGE_CODE, "LANGUAGE"},
{GST_TAG_CDDA_MUSICBRAINZ_DISCID, "MUSICBRAINZ_DISCID"},
{GST_TAG_CDDA_CDDB_DISCID, "DISCID"},
/* some incidence that this makes sense:
/* For the apparent de-facto standard for coverart in vorbis comments, see:
* http://www.hydrogenaudio.org/forums/lofiversion/index.php/t48386.html */
{GST_TAG_PREVIEW_IMAGE, "COVERART"},
/* some evidence that "BPM" is used elsewhere:
* http://mail.kde.org/pipermail/amarok/2006-May/000090.html
*/
{GST_TAG_BEATS_PER_MINUTE, "BPM"},
@ -301,6 +304,68 @@ gst_vorbis_tag_add (GstTagList * list, const gchar * tag, const gchar * value)
}
}
static void
gst_vorbis_tag_add_coverart (GstTagList * tags, const gchar * img_data_base64,
gint base64_len)
{
GstBuffer *img;
guchar *img_data;
gsize img_len;
guint save = 0;
gint state = 0;
if (base64_len < 2)
goto not_enough_data;
img_data = g_try_malloc0 (base64_len * 3 / 4);
if (img_data == NULL)
goto alloc_failed;
img_len = g_base64_decode_step (img_data_base64, base64_len, img_data,
&state, &save);
if (img_len == 0)
goto decode_failed;
img = gst_tag_image_data_to_image_buffer (img_data, img_len,
GST_TAG_IMAGE_TYPE_NONE);
if (img == NULL)
goto convert_failed;
gst_tag_list_add (tags, GST_TAG_MERGE_APPEND,
GST_TAG_PREVIEW_IMAGE, img, NULL);
gst_buffer_unref (img);
g_free (img_data);
return;
/* ERRORS */
not_enough_data:
{
GST_WARNING ("COVERART tag with too little base64-encoded data");
return;
}
alloc_failed:
{
GST_WARNING ("Couldn't allocate enough memory to decode COVERART tag");
return;
}
decode_failed:
{
GST_WARNING ("Couldn't decode bas64 image data from COVERART tag");
g_free (img_data);
return;
}
convert_failed:
{
GST_WARNING ("Couldn't extract image or image type from COVERART tag");
g_free (img_data);
return;
}
}
/**
* gst_tag_list_from_vorbiscomment_buffer:
* @buffer: buffer to convert
@ -333,7 +398,7 @@ gst_tag_list_from_vorbiscomment_buffer (const GstBuffer * buffer,
guint cur_size;
guint iterations;
guint8 *data;
guint size;
guint size, value_len;
GstTagList *list;
g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
@ -345,14 +410,19 @@ gst_tag_list_from_vorbiscomment_buffer (const GstBuffer * buffer,
if (size < 11 || size <= id_data_length + 4)
goto error;
if (id_data_length > 0 && memcmp (data, id_data, id_data_length) != 0)
goto error;
ADVANCE (id_data_length);
if (vendor_string)
*vendor_string = g_strndup (cur, cur_size);
ADVANCE (cur_size);
iterations = cur_size;
cur_size = 0;
while (iterations) {
ADVANCE (cur_size);
iterations--;
@ -364,11 +434,19 @@ gst_tag_list_from_vorbiscomment_buffer (const GstBuffer * buffer,
}
*value = '\0';
value++;
if (!g_utf8_validate (value, -1, NULL)) {
value_len = strlen (value);
if (value_len == 0 || !g_utf8_validate (value, value_len, NULL)) {
g_free (cur);
continue;
}
/* we'll just ignore COVERARTMIME and typefind the image data */
if (g_ascii_strcasecmp (cur, "COVERARTMIME") == 0) {
continue;
} else if (g_ascii_strcasecmp (cur, "COVERART") == 0) {
gst_vorbis_tag_add_coverart (list, value, value_len);
} else {
gst_vorbis_tag_add (list, cur, value);
}
g_free (cur);
}