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Improve Sofdec file detection 

Originally committed as revision 10967 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2007-11-08 21:27:37 +00:00
parent 73039e0fb4
commit 2c18784703
1 changed files with 26 additions and 11 deletions
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37
libavformat/mpeg.c
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@ -114,17 +114,18 @@ static int mpegps_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
MpegDemuxContext *m = s->priv_data;
uint8_t buffer[8192];
char *p;
const char *sofdec = "Sofdec";
int v, i = 0;
m->header_state = 0xff;
s->ctx_flags |= AVFMTCTX_NOHEADER;
get_buffer(&s->pb, buffer, sizeof(buffer));
if ((p=memchr(buffer, 'S', sizeof(buffer)-5)))
if (!memcmp(p, "Sofdec", 6))
m->sofdec = 1;
url_fseek(&s->pb, -(offset_t)sizeof(buffer), SEEK_CUR);
m->sofdec = -1;
do {
v = get_byte(&s->pb);
m->header_state = m->header_state << 8 | v;
m->sofdec++;
} while (v == sofdec[i] && i++ < 6);
/* no need to do more */
return 0;
@ -269,10 +270,24 @@ static int mpegps_read_pes_header(AVFormatContext *s,
goto redo;
if (startcode == SYSTEM_HEADER_START_CODE)
goto redo;
if (startcode == PADDING_STREAM ||
startcode == PRIVATE_STREAM_2) {
/* skip them */
if (startcode == PADDING_STREAM) {
url_fskip(&s->pb, get_be16(&s->pb));
goto redo;
}
if (startcode == PRIVATE_STREAM_2) {
len = get_be16(&s->pb);
if (!m->sofdec) {
while (len-- >= 6) {
if (get_byte(&s->pb) == 'S') {
uint8_t buf[5];
get_buffer(&s->pb, buf, sizeof(buf));
m->sofdec = !memcmp(buf, "ofdec", 5);
len -= sizeof(buf);
break;
}
}
m->sofdec -= !m->sofdec;
}
url_fskip(&s->pb, len);
goto redo;
}
@ -459,7 +474,7 @@ static int mpegps_read_packet(AVFormatContext *s,
type = CODEC_TYPE_VIDEO;
} else if (startcode >= 0x1c0 && startcode <= 0x1df) {
type = CODEC_TYPE_AUDIO;
codec_id = m->sofdec ? CODEC_ID_ADPCM_ADX : CODEC_ID_MP2;
codec_id = m->sofdec > 0 ? CODEC_ID_ADPCM_ADX : CODEC_ID_MP2;
} else if (startcode >= 0x80 && startcode <= 0x87) {
type = CODEC_TYPE_AUDIO;
codec_id = CODEC_ID_AC3;