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avformat/dtsdec: dts_probe: check reserved bit, check lfe, check sr_code similarity 

Fixes misdetection of s16le
Fixes Ticket4109

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 0dba982bb4)
This commit is contained in:
Michael Niedermayer 2014-11-20 00:09:36 +01:00 committed by Carl Eugen Hoyos
parent cc9c74ea87
commit e5f5df37c8
1 changed files with 19 additions and 4 deletions
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23
libavformat/dtsdec.c
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@ -34,7 +34,7 @@ static int dts_probe(AVProbeData *p)
{
const uint8_t *buf, *bufp;
uint32_t state = -1;
int markers[4] = {0};
int markers[4*16] = {0};
int sum, max, i;
int64_t diff = 0;
uint8_t hdr[12 + FF_INPUT_BUFFER_PADDING_SIZE] = { 0 };
@ -43,6 +43,7 @@ static int dts_probe(AVProbeData *p)
for(; buf < (p->buf+p->buf_size)-2; buf+=2) {
int marker, sample_blocks, sample_rate, sr_code, framesize;
int lfe;
GetBitContext gb;
bufp = buf;
@ -89,13 +90,27 @@ static int dts_probe(AVProbeData *p)
if (sample_rate == 0)
continue;
get_bits(&gb, 5);
if (get_bits(&gb, 1))
continue;
skip_bits_long(&gb, 9);
lfe = get_bits(&gb, 2);
if (lfe > 2)
continue;
marker += 4* sr_code;
markers[marker] ++;
}
sum = markers[0] + markers[1] + markers[2] + markers[3];
max = 0;
for (i=1; i<4; i++)
sum = max = 0;
for (i=0; i<FF_ARRAY_ELEMS(markers); i++) {
sum += markers[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)