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Code Issues Releases Activity

seperate redo (we dont handle this possibly valid packet) from

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error_redo (somethings is definitly wrong) in which case we try to resync from the last startcode

Originally committed as revision 7560 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-01-17 10:19:10 +00:00
parent ca2560dff6
commit e56cfad04b
1 changed files with 14 additions and 11 deletions
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25
libavformat/mpeg.c
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@ -1445,14 +1445,17 @@ static int mpegps_read_pes_header(AVFormatContext *s,
{
MpegDemuxContext *m = s->priv_data;
int len, size, startcode, c, flags, header_len;
int64_t pts, dts, last_pos;
int64_t pts, dts;
int64_t last_sync= url_ftell(&s->pb);
last_pos = -1;
error_redo:
url_fseek(&s->pb, last_sync, SEEK_SET);
redo:
/* next start code (should be immediately after) */
m->header_state = 0xff;
size = MAX_SYNC_SIZE;
startcode = find_next_start_code(&s->pb, &size, &m->header_state);
last_sync = url_ftell(&s->pb);
//printf("startcode=%x pos=0x%"PRIx64"\n", startcode, url_ftell(&s->pb));
if (startcode < 0)
return AVERROR_IO;
@ -1486,7 +1489,7 @@ static int mpegps_read_pes_header(AVFormatContext *s,
/* stuffing */
for(;;) {
if (len < 1)
goto redo;
goto error_redo;
c = get_byte(&s->pb);
len--;
/* XXX: for mpeg1, should test only bit 7 */
@ -1496,19 +1499,19 @@ static int mpegps_read_pes_header(AVFormatContext *s,
if ((c & 0xc0) == 0x40) {
/* buffer scale & size */
if (len < 2)
goto redo;
goto error_redo;
get_byte(&s->pb);
c = get_byte(&s->pb);
len -= 2;
}
if ((c & 0xf0) == 0x20) {
if (len < 4)
goto redo;
goto error_redo;
dts = pts = get_pts(&s->pb, c);
len -= 4;
} else if ((c & 0xf0) == 0x30) {
if (len < 9)
goto redo;
goto error_redo;
pts = get_pts(&s->pb, c);
dts = get_pts(&s->pb, -1);
len -= 9;
@ -1524,18 +1527,18 @@ static int mpegps_read_pes_header(AVFormatContext *s,
header_len = get_byte(&s->pb);
len -= 2;
if (header_len > len)
goto redo;
goto error_redo;
if ((flags & 0xc0) == 0x80) {
dts = pts = get_pts(&s->pb, -1);
if (header_len < 5)
goto redo;
goto error_redo;
header_len -= 5;
len -= 5;
} if ((flags & 0xc0) == 0xc0) {
pts = get_pts(&s->pb, -1);
dts = get_pts(&s->pb, -1);
if (header_len < 10)
goto redo;
goto error_redo;
header_len -= 10;
len -= 10;
}
@ -1550,13 +1553,13 @@ static int mpegps_read_pes_header(AVFormatContext *s,
if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
if (len < 1)
goto redo;
goto error_redo;
startcode = get_byte(&s->pb);
len--;
if (startcode >= 0x80 && startcode <= 0xbf) {
/* audio: skip header */
if (len < 3)
goto redo;
goto error_redo;
get_byte(&s->pb);
get_byte(&s->pb);
get_byte(&s->pb);