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DCA: Occasionally a false XCH sync word can turn up after the core DTS data,

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to verify the sync word the extension fsize field should be compared to
the core data length field.

Patch by nick.nbrereton@net

Originally committed as revision 24054 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Nick Brereton 2010-07-05 08:16:43 +00:00 committed by Benjamin Larsson
parent 03f0d17575
commit 0712c230ae
1 changed files with 7 additions and 1 deletions
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8
libavcodec/dca.c
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@ -1298,7 +1298,13 @@ static int dca_decode_frame(AVCodecContext * avctx,
switch(bits) {
case 0x5a5a5a5a: {
int ext_base_ch = s->prim_channels;
int ext_amode;
int ext_amode, xch_fsize;
/* validate sync word using XCHFSIZE field */
xch_fsize = show_bits(&s->gb, 10);
if((s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize) &&
(s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize + 1))
continue;
/* skip length-to-end-of-frame field for the moment */
skip_bits(&s->gb, 10);