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apetag: account for header size if present when returning the start position 

The size field in the header/footer accounts for the entire APE tag
structure except the 32 bytes from header, for compatibility with
APEv1.

Signed-off-by: James Almer <jamrial@gmail.com>

CC: libav-stable@libav.org

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
James Almer 2017-02-10 20:24:27 -03:00 committed by Anton Khirnov
parent 3f258f5ee0
commit 4cc0227040
1 changed files with 6 additions and 1 deletions
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7
libavformat/apetag.c
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@ -31,6 +31,7 @@
#define APE_TAG_VERSION 2000
#define APE_TAG_FOOTER_BYTES 32
#define APE_TAG_HEADER_BYTES 32
#define APE_TAG_FLAG_CONTAINS_HEADER (1 << 31)
#define APE_TAG_FLAG_LACKS_FOOTER (1 << 30)
#define APE_TAG_FLAG_IS_HEADER (1 << 29)
@ -154,7 +155,6 @@ int64_t ff_ape_parse_tag(AVFormatContext *s)
av_log(s, AV_LOG_ERROR, "Invalid tag size %"PRIu32".\n", tag_bytes);
return 0;
}
tag_start = file_size - tag_bytes - APE_TAG_FOOTER_BYTES;
fields = avio_rl32(pb); /* number of fields */
if (fields > 65536) {
@ -170,6 +170,11 @@ int64_t ff_ape_parse_tag(AVFormatContext *s)
avio_seek(pb, file_size - tag_bytes, SEEK_SET);
if (val & APE_TAG_FLAG_CONTAINS_HEADER)
tag_bytes += APE_TAG_HEADER_BYTES;
tag_start = file_size - tag_bytes;
for (i=0; i<fields; i++)
if (ape_tag_read_field(s) < 0) break;