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avoid too many false detections

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Originally committed as revision 1537 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2003-02-02 20:04:03 +00:00
parent 4c7e861929
commit fa7773216a
2 changed files with 37 additions and 31 deletions
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15
libavformat/mpeg.c
View File

@ -405,15 +405,19 @@ static int mpeg_mux_end(AVFormatContext *ctx)
static int mpegps_probe(AVProbeData *p)
{
int code, c, i;
code = 0xff;
int code;
const uint8_t *d;
/* we search the first start code. If it is a packet start code,
then we decide it is mpeg ps. We do not send highest value to
give a chance to mpegts */
for(i=0;i<p->buf_size;i++) {
c = p->buf[i];
code = (code << 8) | c;
/* NOTE: the search range was restricted to avoid too many false
detections */
if (p->buf_size < 6)
return 0;
d = p->buf;
code = (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | (d[3]);
if ((code & 0xffffff00) == 0x100) {
if (code == PACK_START_CODE ||
code == SYSTEM_HEADER_START_CODE ||
@ -427,7 +431,6 @@ static int mpegps_probe(AVProbeData *p)
else
return 0;
}
}
return 0;
}

15
libavformat/raw.c
View File

@ -153,15 +153,19 @@ static int video_read_header(AVFormatContext *s,
/* XXX: improve that by looking at several start codes */
static int mpegvideo_probe(AVProbeData *p)
{
int code, c, i;
code = 0xff;
int code;
const uint8_t *d;
/* we search the first start code. If it is a sequence, gop or
picture start code then we decide it is an mpeg video
stream. We do not send highest value to give a chance to mpegts */
for(i=0;i<p->buf_size;i++) {
c = p->buf[i];
code = (code << 8) | c;
/* NOTE: the search range was restricted to avoid too many false
detections */
if (p->buf_size < 6)
return 0;
d = p->buf;
code = (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | (d[3]);
if ((code & 0xffffff00) == 0x100) {
if (code == SEQ_START_CODE ||
code == GOP_START_CODE ||
@ -170,7 +174,6 @@ static int mpegvideo_probe(AVProbeData *p)
else
return 0;
}
}
return 0;
}