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avformat/dtsdec: check more of the dca headers in dts_probe()

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Fixes misdetection of 664461_flac_16_44100_2.wav
Fixes Ticket3830

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-08-06 21:21:53 +02:00
parent 7a34b7d80f
commit 6a44699746
1 changed files with 46 additions and 16 deletions
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62
libavformat/dtsdec.c
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@ -20,6 +20,8 @@
*/
#include "libavcodec/bytestream.h"
#include "libavcodec/get_bits.h"
#include "libavcodec/dca.h"
#include "avformat.h"
#include "rawdec.h"
@ -35,31 +37,59 @@ static int dts_probe(AVProbeData *p)
int markers[4] = {0};
int sum, max, i;
int64_t diff = 0;
uint8_t hdr[12 + FF_INPUT_BUFFER_PADDING_SIZE] = { 0 };
buf = p->buf + FFMIN(4096, p->buf_size);
for(; buf < (p->buf+p->buf_size)-2; buf+=2) {
int marker, sample_blocks, sample_rate, sr_code, framesize;
GetBitContext gb;
bufp = buf;
state = (state << 16) | bytestream_get_be16(&bufp);
/* regular bitstream */
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[2]++;
/* 14 bits little-endian bitstream */
if (state == DCA_MARKER_14B_LE)
if ((bytestream_get_be16(&bufp) & 0xF0FF) == 0xF007)
markers[3]++;
if (buf - p->buf >= 4)
diff += FFABS(((int16_t)AV_RL16(buf)) - (int16_t)AV_RL16(buf-4));
/* regular bitstream */
if (state == DCA_MARKER_RAW_BE)
marker = 0;
else if (state == DCA_MARKER_RAW_LE)
marker = 1;
/* 14 bits big-endian bitstream */
else if (state == DCA_MARKER_14B_BE &&
(bytestream_get_be16(&bufp) & 0xFFF0) == 0x07F0)
marker = 2;
/* 14 bits little-endian bitstream */
else if (state == DCA_MARKER_14B_LE &&
(bytestream_get_be16(&bufp) & 0xF0FF) == 0xF007)
marker = 3;
else
continue;
if (avpriv_dca_convert_bitstream(buf-2, 12, hdr, 12) < 0)
continue;
init_get_bits(&gb, hdr, 96);
skip_bits_long(&gb, 39);
sample_blocks = get_bits(&gb, 7) + 1;
if (sample_blocks < 8)
continue;
framesize = get_bits(&gb, 14) + 1;
if (framesize < 95)
continue;
skip_bits(&gb, 6);
sr_code = get_bits(&gb, 4);
sample_rate = avpriv_dca_sample_rates[sr_code];
if (sample_rate == 0)
continue;
markers[marker] ++;
}
sum = markers[0] + markers[1] + markers[2] + markers[3];
max = 0;