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avformat/dtsdec: count LE and BE separately in dts_probe()

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-08-02 17:21:03 +02:00
parent 66627075d9
commit dd551dc7ff
1 changed files with 12 additions and 8 deletions
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20
libavformat/dtsdec.c
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@ -32,8 +32,8 @@ static int dts_probe(AVProbeData *p)
{
const uint8_t *buf, *bufp;
uint32_t state = -1;
int markers[3] = {0};
int sum, max;
int markers[4] = {0};
int sum, max, i;
int64_t diff = 0;
buf = p->buf;
@ -43,25 +43,29 @@ static int dts_probe(AVProbeData *p)
state = (state << 16) | bytestream_get_be16(&bufp);
/* regular bitstream */
if (state == DCA_MARKER_RAW_BE || state == DCA_MARKER_RAW_LE)
if (state == DCA_MARKER_RAW_BE)
markers[0]++;
if (state == DCA_MARKER_RAW_LE)
markers[1]++;
/* 14 bits big-endian bitstream */
if (state == DCA_MARKER_14B_BE)
if ((bytestream_get_be16(&bufp) & 0xFFF0) == 0x07F0)
markers[1]++;
markers[2]++;
/* 14 bits little-endian bitstream */
if (state == DCA_MARKER_14B_LE)
if ((bytestream_get_be16(&bufp) & 0xF0FF) == 0xF007)
markers[2]++;
markers[3]++;
if (buf - p->buf >= 4)
diff += FFABS(AV_RL16(buf) - AV_RL16(buf-4));
}
sum = markers[0] + markers[1] + markers[2];
max = markers[1] > markers[0];
max = markers[2] > markers[max] ? 2 : max;
sum = markers[0] + markers[1] + markers[2] + markers[3];
max = 0;
for (i=1; i<4; i++)
if (markers[max] < markers[i])
max = i;
if (markers[max] > 3 && p->buf_size / markers[max] < 32*1024 &&
markers[max] * 4 > sum * 3 &&
diff / p->buf_size > 200)