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dts probe

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Originally committed as revision 13040 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Benjamin Larsson 2008-05-03 00:12:32 +00:00
parent 97085fa154
commit fde8052e4e
1 changed files with 35 additions and 1 deletions
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36
libavformat/raw.c
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@ -24,6 +24,7 @@
#include "raw.h"
#include "crc.h"
#include "bitstream.h"
#include "bytestream.h"
#ifdef CONFIG_MUXERS
/* simple formats */
@ -347,6 +348,39 @@ static int h261_probe(AVProbeData *p)
return 0;
}
#define DCA_MARKER_14B_BE 0x1FFFE800
#define DCA_MARKER_14B_LE 0xFF1F00E8
#define DCA_MARKER_RAW_BE 0x7FFE8001
#define DCA_MARKER_RAW_LE 0xFE7F0180
static int dts_probe(AVProbeData *p)
{
const uint8_t *buf, *bufp;
uint32_t state = -1;
buf = p->buf;
for(; buf < (p->buf+p->buf_size)-2; buf+=2) {
bufp = buf;
state = (state << 16) | bytestream_get_be16(&bufp);
/* Regular bitstream */
if (state == DCA_MARKER_RAW_BE || state == DCA_MARKER_RAW_LE)
return AVPROBE_SCORE_MAX/2+1;
/* 14 bits big endian bitstream */
if (state == DCA_MARKER_14B_BE)
if ((bytestream_get_be16(&bufp) & 0xFFF0) == 0x07F0)
return AVPROBE_SCORE_MAX/2+1;
/* 14 bits little endian bitstream */
if (state == DCA_MARKER_14B_LE)
if ((bytestream_get_be16(&bufp) & 0xF0FF) == 0xF007)
return AVPROBE_SCORE_MAX/2+1;
}
return 0;
}
static int dirac_probe(AVProbeData *p)
{
if (AV_RL32(p->buf) == MKTAG('B', 'B', 'C', 'D'))
@ -510,7 +544,7 @@ AVInputFormat dts_demuxer = {
"dts",
"raw dts",
0,
NULL,
dts_probe,
audio_read_header,
raw_read_partial_packet,
raw_read_close,