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avformat/dtsdec: Extend DTS core sync word

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Check extended sync word for 16-bit LE and BE core streams to reduce
probability of alias sync detection. Previously sync word extension was
checked only for 14-bit streams.

This follows up the similar change in avcodec/dca_parser.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
foo86 2015-04-28 17:47:53 +03:00 committed by Michael Niedermayer
parent e2877bdf38
commit 191dd219d9
1 changed files with 4 additions and 2 deletions
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6
libavformat/dtsdec.c
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@ -50,9 +50,11 @@ static int dts_probe(AVProbeData *p)
diff += FFABS(((int16_t)AV_RL16(buf)) - (int16_t)AV_RL16(buf-4));
/* regular bitstream */
if (state == DCA_SYNCWORD_CORE_BE)
if (state == DCA_SYNCWORD_CORE_BE &&
(bytestream_get_be16(&bufp) & 0xFC00) == 0xFC00)
marker = 0;
else if (state == DCA_SYNCWORD_CORE_LE)
else if (state == DCA_SYNCWORD_CORE_LE &&
(bytestream_get_be16(&bufp) & 0x00FC) == 0x00FC)
marker = 1;
/* 14 bits big-endian bitstream */