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tag: id3v2: parse unsynchronised tags properly

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We didn't handle unsynchronization at all up to now, which might have
caused frames to not be extracted - esp. frames after an APIC picture
frame. Fixes #577468.
This commit is contained in:
Tim-Philipp Müller 2009-04-24 01:51:35 +01:00
parent bd738166a7
commit 941d5080fa
1 changed files with 58 additions and 1 deletions
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59
gst-libs/gst/tag/id3v2.c
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@ -97,12 +97,40 @@ id3demux_calc_id3v2_tag_size (GstBuffer * buf)
return size;
}
static guint8 *
id3demux_ununsync_data (const guint8 * unsync_data, guint32 * size)
{
const guint8 *end;
guint8 *out, *uu;
guint out_size;
uu = out = g_malloc (*size);
for (end = unsync_data + *size; unsync_data < end - 1; ++unsync_data, ++uu) {
*uu = *unsync_data;
if (G_UNLIKELY (*unsync_data == 0xff && *(unsync_data + 1) == 0x00))
++unsync_data;
}
/* take care of last byte (if last two bytes weren't 0xff 0x00) */
if (unsync_data < end) {
*uu = *unsync_data;
++uu;
}
out_size = uu - out;
GST_DEBUG ("size after un-unsyncing: %u (before: %u)", out_size, *size);
*size = out_size;
return out;
}
/* caller must pass buffer with full ID3 tag */
ID3TagsResult
id3demux_read_id3v2_tag (GstBuffer * buffer, guint * id3v2_size,
GstTagList ** tags)
{
guint8 *data;
guint8 *data, *uu_data = NULL;
guint read_size;
ID3TagsWorking work;
guint8 flags;
@ -134,6 +162,12 @@ id3demux_read_id3v2_tag (GstBuffer * buffer, guint * id3v2_size,
return ID3TAGS_READ_TAG;
}
GST_DEBUG ("ID3v2 header flags: %s %s %s %s",
(flags & ID3V2_HDR_FLAG_UNSYNC) ? "UNSYNC" : "",
(flags & ID3V2_HDR_FLAG_EXTHDR) ? "EXTENDED_HEADER" : "",
(flags & ID3V2_HDR_FLAG_EXPERIMENTAL) ? "EXPERIMENTAL" : "",
(flags & ID3V2_HDR_FLAG_FOOTER) ? "FOOTER" : "");
/* This shouldn't really happen! Caller should have checked first */
if (GST_BUFFER_SIZE (buffer) < read_size) {
GST_DEBUG
@ -148,6 +182,8 @@ id3demux_read_id3v2_tag (GstBuffer * buffer, guint * id3v2_size,
g_return_val_if_fail (tags != NULL, ID3TAGS_READ_TAG);
GST_MEMDUMP ("ID3v2 tag", GST_BUFFER_DATA (buffer), read_size);
memset (&work, 0, sizeof (ID3TagsWorking));
work.buffer = buffer;
work.hdr.version = version;
@ -159,10 +195,20 @@ id3demux_read_id3v2_tag (GstBuffer * buffer, guint * id3v2_size,
else
work.hdr.frame_data_size = read_size - ID3V2_HDR_SIZE;
if ((flags & ID3V2_HDR_FLAG_UNSYNC)) {
GST_DEBUG ("Un-unsyncing entire tag");
uu_data = id3demux_ununsync_data (work.hdr.frame_data,
&work.hdr.frame_data_size);
work.hdr.frame_data = uu_data;
GST_MEMDUMP ("ID3v2 tag (un-unsyced)", uu_data, work.hdr.frame_data_size);
}
result = id3demux_id3v2_frames_to_tag_list (&work, work.hdr.frame_data_size);
*tags = work.tags;
g_free (uu_data);
return result;
}
@ -425,6 +471,17 @@ id3demux_id3v2_frames_to_tag_list (ID3TagsWorking * work, guint size)
frame_size, work->hdr.frame_data + frame_hdr_size + frame_size - start,
work->hdr.frame_data + frame_hdr_size + frame_size - start,
obsolete_id);
#define flag_string(flag,str) \
((frame_flags & (flag)) ? (str) : "")
GST_LOG ("Frame header flags: 0x%04x %s %s %s %s %s %s %s", frame_flags,
flag_string (ID3V2_FRAME_STATUS_FRAME_ALTER_PRESERVE, "ALTER_PRESERVE"),
flag_string (ID3V2_FRAME_STATUS_READONLY, "READONLY"),
flag_string (ID3V2_FRAME_FORMAT_GROUPING_ID, "GROUPING_ID"),
flag_string (ID3V2_FRAME_FORMAT_COMPRESSION, "COMPRESSION"),
flag_string (ID3V2_FRAME_FORMAT_ENCRYPTION, "ENCRYPTION"),
flag_string (ID3V2_FRAME_FORMAT_UNSYNCHRONISATION, "UNSYNC"),
flag_string (ID3V2_FRAME_FORMAT_DATA_LENGTH_INDICATOR, "LENGHT_IND"));
#undef flag_str
#endif
if (!obsolete_id) {