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Code Issues Releases Activity

- Looks a tiny bit harder in mpegps_probe() for a valid start code. This is

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needed to detect some files produced by pvr-250/350 capture cards.
- Adds AC3 audio support to the mpegts demuxer, and makes it a little more
tolerant of bad files.
patch by (Isaac Richards <ijr at po dot cwru dot edu>)

Originally committed as revision 2028 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Isaac Richards 2003-07-10 09:04:04 +00:00 committed by Michael Niedermayer
parent 3d32b429d3
commit ec23a47286
3 changed files with 50 additions and 19 deletions
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10
libavformat/mpeg.c
View File

@ -405,9 +405,10 @@ static int mpeg_mux_end(AVFormatContext *ctx)
static int mpegps_probe(AVProbeData *p)
{
int code;
int code, c, i;
const uint8_t *d;
code = 0xff;
/* 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 */
@ -416,8 +417,10 @@ static int mpegps_probe(AVProbeData *p)
if (p->buf_size < 6)
return 0;
d = p->buf;
code = (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | (d[3]);
for (i = 0; i < 20; i++) {
c = p->buf[i];
code = (code << 8) | c;
if ((code & 0xffffff00) == 0x100) {
if (code == PACK_START_CODE ||
code == SYSTEM_HEADER_START_CODE ||
@ -431,6 +434,7 @@ static int mpegps_probe(AVProbeData *p)
else
return 0;
}
}
return 0;
}

31
libavformat/mpegts.c
View File

@ -387,6 +387,7 @@ static void pmt_cb(void *opaque, const uint8_t *section, int section_len)
case STREAM_TYPE_AUDIO_MPEG2:
case STREAM_TYPE_VIDEO_MPEG1:
case STREAM_TYPE_VIDEO_MPEG2:
case STREAM_TYPE_AUDIO_AC3:
add_pes_stream(ts->stream, pid);
break;
default:
@ -613,16 +614,19 @@ static void mpegts_push_data(void *opaque,
if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
pes->header[2] == 0x01) {
/* it must be an mpeg2 PES stream */
/* XXX: add AC3 support */
code = pes->header[3] | 0x100;
if (!((code >= 0x1c0 && code <= 0x1df) ||
(code >= 0x1e0 && code <= 0x1ef)))
(code >= 0x1e0 && code <= 0x1ef) ||
(code == 0x1bd)))
goto skip;
if (!pes->st) {
/* allocate stream */
if (code >= 0x1c0 && code <= 0x1df) {
codec_type = CODEC_TYPE_AUDIO;
codec_id = CODEC_ID_MP2;
} else if (code == 0x1bd) {
codec_type = CODEC_TYPE_AUDIO;
codec_id = CODEC_ID_AC3;
} else {
codec_type = CODEC_TYPE_VIDEO;
codec_id = CODEC_ID_MPEG1VIDEO;
@ -805,6 +809,8 @@ static int handle_packets(AVFormatContext *s, int nb_packets)
ByteIOContext *pb = &s->pb;
uint8_t packet[TS_FEC_PACKET_SIZE];
int packet_num, len;
int i, found = 0;
int64_t pos;
ts->stop_parse = 0;
packet_num = 0;
@ -814,13 +820,32 @@ static int handle_packets(AVFormatContext *s, int nb_packets)
packet_num++;
if (nb_packets != 0 && packet_num >= nb_packets)
break;
pos = url_ftell(pb);
len = get_buffer(pb, packet, ts->raw_packet_size);
if (len != ts->raw_packet_size)
return AVERROR_IO;
/* check paquet sync byte */
/* XXX: accept to resync ? */
if (packet[0] != 0x47)
{
//printf("bad packet: 0x%x\n", packet[0]);
found = 0;
for (i = 0; i < ts->raw_packet_size; i++)
{
if (packet[i] == 0x47)
{
found = 1;
//printf("packet start at: %d\n", i);
break;
}
}
if (found)
{
url_fseek(pb, pos + i, SEEK_SET);
continue;
}
return AVERROR_INVALIDDATA;
}
handle_packet(s, packet);
}
return 0;

2
libavformat/mpegts.h
View File

@ -38,5 +38,7 @@
#define STREAM_TYPE_PRIVATE_SECTION 0x05
#define STREAM_TYPE_PRIVATE_DATA 0x06
#define STREAM_TYPE_AUDIO_AC3 0x81
unsigned int mpegts_crc32(const uint8_t *data, int len);
extern AVOutputFormat mpegts_mux;