de6d9b64 |
/* |
2abe5a01 |
* MPEG1/2 demuxer |
406792e7 |
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard |
de6d9b64 |
* |
b78e7197 |
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
19720f15 |
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
b78e7197 |
* version 2.1 of the License, or (at your option) any later version. |
de6d9b64 |
* |
b78e7197 |
* FFmpeg is distributed in the hope that it will be useful, |
de6d9b64 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
19720f15 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details. |
de6d9b64 |
* |
19720f15 |
* You should have received a copy of the GNU Lesser General Public |
b78e7197 |
* License along with FFmpeg; if not, write to the Free Software |
5509bffa |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
de6d9b64 |
*/ |
2abe5a01 |
|
de6d9b64 |
#include "avformat.h" |
2abe5a01 |
#include "mpeg.h" |
de6d9b64 |
|
27f388aa |
//#define DEBUG_SEEK |
de6d9b64 |
|
b754978a |
#undef NDEBUG
#include <assert.h>
|
de6d9b64 |
/*********************************************/
/* demux code */
#define MAX_SYNC_SIZE 100000
|
c6dcd0d7 |
static int check_pes(uint8_t *p, uint8_t *end){
int pes1;
int pes2= (p[3] & 0xC0) == 0x80
&& (p[4] & 0xC0) != 0x40
&&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
for(p+=3; p<end && *p == 0xFF; p++);
if((*p&0xC0) == 0x40) p+=2;
if((*p&0xF0) == 0x20){
pes1= p[0]&p[2]&p[4]&1;
}else if((*p&0xF0) == 0x30){
pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
}else
pes1 = *p == 0x0F;
return pes1||pes2;
}
|
db7f1f95 |
static int mpegps_probe(AVProbeData *p)
{ |
9870a7bd |
uint32_t code= -1; |
7e1720de |
int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0; |
95f97de1 |
int i; |
a1c69e0b |
int score=0; |
db7f1f95 |
|
9870a7bd |
for(i=0; i<p->buf_size; i++){
code = (code<<8) + p->buf[i]; |
ec23a472 |
if ((code & 0xffffff00) == 0x100) { |
0c904db1 |
int pes= check_pes(p->buf+i, p->buf+p->buf_size); |
c6dcd0d7 |
|
25c533a2 |
if(code == SYSTEM_HEADER_START_CODE) sys++;
else if(code == PRIVATE_STREAM_1) priv1++;
else if(code == PACK_START_CODE) pspack++; |
274335e7 |
else if((code & 0xf0) == VIDEO_ID && pes) vid++;
else if((code & 0xe0) == AUDIO_ID && pes) audio++; |
7e1720de |
else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
else if((code & 0xe0) == AUDIO_ID && !pes) invalid++; |
ec23a472 |
} |
db7f1f95 |
} |
a1c69e0b |
|
7e1720de |
if(vid+audio > invalid) /* invalid VDR files nd short PES streams */ |
a1c69e0b |
score= AVPROBE_SCORE_MAX/4;
|
6de5b627 |
//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d %d len:%d\n", sys, priv1, pspack,vid, audio, invalid, p->buf_size); |
7e1720de |
if(sys>invalid && sys*9 <= pspack*10) |
c4674a47 |
return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg |
55f65247 |
if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9) |
c4674a47 |
return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */ |
3489e150 |
return (audio > 12 || vid > 3) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; |
a1c69e0b |
//02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1 |
3489e150 |
//mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6 |
a1c69e0b |
return score; |
db7f1f95 |
}
|
de6d9b64 |
typedef struct MpegDemuxContext { |
191e8ca7 |
int32_t header_state; |
e3d1cd8e |
unsigned char psm_es_type[256]; |
8cd4ac3d |
int sofdec; |
de6d9b64 |
} MpegDemuxContext;
|
27f388aa |
static int mpegps_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
MpegDemuxContext *m = s->priv_data; |
2c187847 |
const char *sofdec = "Sofdec";
int v, i = 0; |
8cd4ac3d |
|
27f388aa |
m->header_state = 0xff;
s->ctx_flags |= AVFMTCTX_NOHEADER;
|
2c187847 |
m->sofdec = -1;
do { |
899681cd |
v = get_byte(s->pb); |
2c187847 |
m->header_state = m->header_state << 8 | v;
m->sofdec++;
} while (v == sofdec[i] && i++ < 6); |
8cd4ac3d |
|
711e69a7 |
m->sofdec = (m->sofdec == 6) ? 1 : 0;
|
27f388aa |
/* no need to do more */
return 0;
}
static int64_t get_pts(ByteIOContext *pb, int c)
{ |
66e9e302 |
uint8_t buf[5];
buf[0] = c<0 ? get_byte(pb) : c;
get_buffer(pb, buf+1, 4);
return ff_parse_pes_pts(buf); |
27f388aa |
}
|
115329f1 |
static int find_next_start_code(ByteIOContext *pb, int *size_ptr, |
191e8ca7 |
int32_t *header_state) |
de6d9b64 |
{
unsigned int state, v;
int val, n;
state = *header_state;
n = *size_ptr;
while (n > 0) {
if (url_feof(pb))
break;
v = get_byte(pb);
n--;
if (state == 0x000001) {
state = ((state << 8) | v) & 0xffffff;
val = state;
goto found;
}
state = ((state << 8) | v) & 0xffffff;
}
val = -1;
found:
*header_state = state;
*size_ptr = n;
return val;
}
|
88730be6 |
#if 0 /* unused, remove? */ |
27f388aa |
/* XXX: optimize */
static int find_prev_start_code(ByteIOContext *pb, int *size_ptr) |
de6d9b64 |
{ |
27f388aa |
int64_t pos, pos_start;
int max_size, start_code; |
da24c5e3 |
|
27f388aa |
max_size = *size_ptr;
pos_start = url_ftell(pb); |
de6d9b64 |
|
27f388aa |
/* in order to go faster, we fill the buffer */
pos = pos_start - 16386;
if (pos < 0)
pos = 0;
url_fseek(pb, pos, SEEK_SET);
get_byte(pb); |
de6d9b64 |
|
27f388aa |
pos = pos_start;
for(;;) {
pos--;
if (pos < 0 || (pos_start - pos) >= max_size) {
start_code = -1;
goto the_end;
}
url_fseek(pb, pos, SEEK_SET);
start_code = get_be32(pb);
if ((start_code & 0xffffff00) == 0x100)
break;
}
the_end:
*size_ptr = pos_start - pos;
return start_code; |
de6d9b64 |
} |
88730be6 |
#endif |
de6d9b64 |
|
e3d1cd8e |
/**
* Extracts stream types from a program stream map
* According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35 |
115329f1 |
* |
e3d1cd8e |
* @return number of bytes occupied by PSM in the bitstream
*/
static long mpegps_psm_parse(MpegDemuxContext *m, ByteIOContext *pb)
{
int psm_length, ps_info_length, es_map_length;
psm_length = get_be16(pb);
get_byte(pb);
get_byte(pb);
ps_info_length = get_be16(pb);
/* skip program_stream_info */
url_fskip(pb, ps_info_length);
es_map_length = get_be16(pb);
/* at least one es available? */
while (es_map_length >= 4){ |
274335e7 |
unsigned char type = get_byte(pb);
unsigned char es_id = get_byte(pb); |
e3d1cd8e |
uint16_t es_info_length = get_be16(pb);
/* remember mapping from stream id to stream type */
m->psm_es_type[es_id] = type;
/* skip program_stream_info */
url_fskip(pb, es_info_length);
es_map_length -= 4 + es_info_length;
}
get_be32(pb); /* crc32 */
return 2 + psm_length;
}
|
115329f1 |
/* read the next PES header. Return its position in ppos |
27f388aa |
(if not NULL), and its start code, pts and dts.
*/
static int mpegps_read_pes_header(AVFormatContext *s, |
115329f1 |
int64_t *ppos, int *pstart_code, |
8d14a25c |
int64_t *ppts, int64_t *pdts) |
de6d9b64 |
{
MpegDemuxContext *m = s->priv_data; |
27f388aa |
int len, size, startcode, c, flags, header_len; |
aad512b4 |
int pes_ext, ext2_len, id_ext, skip; |
e56cfad0 |
int64_t pts, dts; |
899681cd |
int64_t last_sync= url_ftell(s->pb); |
de6d9b64 |
|
e56cfad0 |
error_redo: |
899681cd |
url_fseek(s->pb, last_sync, SEEK_SET); |
de6d9b64 |
redo: |
27f388aa |
/* next start code (should be immediately after) */
m->header_state = 0xff;
size = MAX_SYNC_SIZE; |
899681cd |
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)); |
0332324a |
if (startcode < 0){
if(url_feof(s->pb))
return AVERROR_EOF;
//FIXME we should remember header_state
return AVERROR(EAGAIN);
}
|
de6d9b64 |
if (startcode == PACK_START_CODE)
goto redo;
if (startcode == SYSTEM_HEADER_START_CODE)
goto redo; |
2c187847 |
if (startcode == PADDING_STREAM) { |
899681cd |
url_fskip(s->pb, get_be16(s->pb)); |
2c187847 |
goto redo;
}
if (startcode == PRIVATE_STREAM_2) { |
899681cd |
len = get_be16(s->pb); |
2c187847 |
if (!m->sofdec) {
while (len-- >= 6) { |
899681cd |
if (get_byte(s->pb) == 'S') { |
2c187847 |
uint8_t buf[5]; |
899681cd |
get_buffer(s->pb, buf, sizeof(buf)); |
2c187847 |
m->sofdec = !memcmp(buf, "ofdec", 5);
len -= sizeof(buf);
break;
}
}
m->sofdec -= !m->sofdec;
} |
899681cd |
url_fskip(s->pb, len); |
de6d9b64 |
goto redo;
} |
e3d1cd8e |
if (startcode == PROGRAM_STREAM_MAP) { |
899681cd |
mpegps_psm_parse(m, s->pb); |
e3d1cd8e |
goto redo;
} |
115329f1 |
|
de6d9b64 |
/* find matching stream */
if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
(startcode >= 0x1e0 && startcode <= 0x1ef) || |
aad512b4 |
(startcode == 0x1bd) || (startcode == 0x1fd))) |
de6d9b64 |
goto redo; |
27f388aa |
if (ppos) { |
899681cd |
*ppos = url_ftell(s->pb) - 4; |
27f388aa |
} |
899681cd |
len = get_be16(s->pb); |
75a9fbb9 |
pts = |
b2cac184 |
dts = AV_NOPTS_VALUE; |
de6d9b64 |
/* stuffing */
for(;;) { |
27f388aa |
if (len < 1) |
e56cfad0 |
goto error_redo; |
899681cd |
c = get_byte(s->pb); |
de6d9b64 |
len--;
/* XXX: for mpeg1, should test only bit 7 */ |
115329f1 |
if (c != 0xff) |
de6d9b64 |
break;
}
if ((c & 0xc0) == 0x40) {
/* buffer scale & size */ |
899681cd |
get_byte(s->pb);
c = get_byte(s->pb); |
de6d9b64 |
len -= 2;
} |
b90ba24b |
if ((c & 0xe0) == 0x20) { |
899681cd |
dts = pts = get_pts(s->pb, c); |
de6d9b64 |
len -= 4; |
b90ba24b |
if (c & 0x10){ |
899681cd |
dts = get_pts(s->pb, -1); |
b90ba24b |
len -= 5;
} |
de6d9b64 |
} else if ((c & 0xc0) == 0x80) {
/* mpeg 2 PES */ |
d8bee8dd |
#if 0 /* some streams have this field set for no apparent reason */ |
de6d9b64 |
if ((c & 0x30) != 0) { |
27f388aa |
/* Encrypted multiplex not handled */
goto redo; |
de6d9b64 |
} |
d8bee8dd |
#endif |
899681cd |
flags = get_byte(s->pb);
header_len = get_byte(s->pb); |
de6d9b64 |
len -= 2;
if (header_len > len) |
e56cfad0 |
goto error_redo; |
80036204 |
len -= header_len; |
b90ba24b |
if (flags & 0x80) { |
899681cd |
dts = pts = get_pts(s->pb, -1); |
de6d9b64 |
header_len -= 5; |
b90ba24b |
if (flags & 0x40) { |
899681cd |
dts = get_pts(s->pb, -1); |
b90ba24b |
header_len -= 5;
} |
de6d9b64 |
} |
675b8390 |
if (flags & 0x3f && header_len == 0){
flags &= 0xC0;
av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
} |
aad512b4 |
if (flags & 0x01) { /* PES extension */ |
899681cd |
pes_ext = get_byte(s->pb); |
aad512b4 |
header_len--;
/* Skip PES private data, program packet sequence counter and P-STD buffer */
skip = (pes_ext >> 4) & 0xb;
skip += skip & 0x9; |
b22d0c04 |
if (pes_ext & 0x40 || skip > header_len){
av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
pes_ext=skip=0;
} |
899681cd |
url_fskip(s->pb, skip); |
aad512b4 |
header_len -= skip;
if (pes_ext & 0x01) { /* PES extension 2 */ |
899681cd |
ext2_len = get_byte(s->pb); |
aad512b4 |
header_len--;
if ((ext2_len & 0x7f) > 0) { |
899681cd |
id_ext = get_byte(s->pb); |
aad512b4 |
if ((id_ext & 0x80) == 0)
startcode = ((startcode & 0xff) << 8) | id_ext;
header_len--;
}
}
} |
80036204 |
if(header_len < 0)
goto error_redo; |
899681cd |
url_fskip(s->pb, header_len); |
de6d9b64 |
} |
df70de1f |
else if( c!= 0xf )
goto redo;
|
e3d1cd8e |
if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) { |
899681cd |
startcode = get_byte(s->pb); |
de6d9b64 |
len--; |
aad512b4 |
if (startcode >= 0x80 && startcode <= 0xcf) { |
de6d9b64 |
/* audio: skip header */ |
899681cd |
get_byte(s->pb);
get_byte(s->pb);
get_byte(s->pb); |
de6d9b64 |
len -= 3; |
aad512b4 |
if (startcode >= 0xb0 && startcode <= 0xbf) {
/* MLP/TrueHD audio has a 4-byte header */ |
899681cd |
get_byte(s->pb); |
aad512b4 |
len--;
} |
de6d9b64 |
}
} |
7e4709b1 |
if(len<0)
goto error_redo; |
b754978a |
if(dts != AV_NOPTS_VALUE && ppos){
int i;
for(i=0; i<s->nb_streams; i++){ |
6ba90c20 |
if(startcode == s->streams[i]->id &&
!url_is_streamed(s->pb) /* index useless on streams anyway */) { |
3dea63bd |
ff_reduce_index(s, i); |
30a43f2d |
av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */); |
b754978a |
}
}
} |
115329f1 |
|
27f388aa |
*pstart_code = startcode;
*ppts = pts;
*pdts = dts;
return len;
}
static int mpegps_read_packet(AVFormatContext *s,
AVPacket *pkt)
{ |
e3d1cd8e |
MpegDemuxContext *m = s->priv_data; |
27f388aa |
AVStream *st; |
fb65d2ca |
int len, startcode, i, es_type;
enum CodecID codec_id = CODEC_ID_NONE; |
72415b2a |
enum AVMediaType type; |
b754978a |
int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work |
1aeb55a1 |
uint8_t av_uninit(dvdaudio_substream_type); |
27f388aa |
redo: |
8d14a25c |
len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts); |
27f388aa |
if (len < 0)
return len; |
115329f1 |
|
80e58c61 |
if(startcode == 0x1bd) {
dvdaudio_substream_type = get_byte(s->pb);
url_fskip(s->pb, 3);
len -= 4;
}
|
de6d9b64 |
/* now find stream */
for(i=0;i<s->nb_streams;i++) {
st = s->streams[i];
if (st->id == startcode)
goto found;
} |
e3d1cd8e |
es_type = m->psm_es_type[startcode & 0xff]; |
80e58c61 |
if(es_type > 0 && es_type != STREAM_TYPE_PRIVATE_DATA){ |
e3d1cd8e |
if(es_type == STREAM_TYPE_VIDEO_MPEG1){
codec_id = CODEC_ID_MPEG2VIDEO; |
72415b2a |
type = AVMEDIA_TYPE_VIDEO; |
e3d1cd8e |
} else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
codec_id = CODEC_ID_MPEG2VIDEO; |
72415b2a |
type = AVMEDIA_TYPE_VIDEO; |
e3d1cd8e |
} else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
es_type == STREAM_TYPE_AUDIO_MPEG2){
codec_id = CODEC_ID_MP3; |
72415b2a |
type = AVMEDIA_TYPE_AUDIO; |
e3d1cd8e |
} else if(es_type == STREAM_TYPE_AUDIO_AAC){
codec_id = CODEC_ID_AAC; |
72415b2a |
type = AVMEDIA_TYPE_AUDIO; |
e3d1cd8e |
} else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
codec_id = CODEC_ID_MPEG4; |
72415b2a |
type = AVMEDIA_TYPE_VIDEO; |
e3d1cd8e |
} else if(es_type == STREAM_TYPE_VIDEO_H264){
codec_id = CODEC_ID_H264; |
72415b2a |
type = AVMEDIA_TYPE_VIDEO; |
e3d1cd8e |
} else if(es_type == STREAM_TYPE_AUDIO_AC3){
codec_id = CODEC_ID_AC3; |
72415b2a |
type = AVMEDIA_TYPE_AUDIO; |
e3d1cd8e |
} else {
goto skip;
}
} else if (startcode >= 0x1e0 && startcode <= 0x1ef) { |
83d07313 |
static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
unsigned char buf[8]; |
899681cd |
get_buffer(s->pb, buf, 8);
url_fseek(s->pb, -8, SEEK_CUR); |
83d07313 |
if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
codec_id = CODEC_ID_CAVS;
else |
c1c90466 |
codec_id = CODEC_ID_PROBE; |
72415b2a |
type = AVMEDIA_TYPE_VIDEO; |
db7f1f95 |
} else if (startcode >= 0x1c0 && startcode <= 0x1df) { |
72415b2a |
type = AVMEDIA_TYPE_AUDIO; |
2c187847 |
codec_id = m->sofdec > 0 ? CODEC_ID_ADPCM_ADX : CODEC_ID_MP2; |
3f2bf07b |
} else if (startcode >= 0x80 && startcode <= 0x87) { |
72415b2a |
type = AVMEDIA_TYPE_AUDIO; |
db7f1f95 |
codec_id = CODEC_ID_AC3; |
274335e7 |
} else if ( ( startcode >= 0x88 && startcode <= 0x8f) |
aad512b4 |
||( startcode >= 0x98 && startcode <= 0x9f)) {
/* 0x90 - 0x97 is reserved for SDDS in DVD specs */ |
72415b2a |
type = AVMEDIA_TYPE_AUDIO; |
23c99253 |
codec_id = CODEC_ID_DTS; |
aad512b4 |
} else if (startcode >= 0xa0 && startcode <= 0xaf) { |
72415b2a |
type = AVMEDIA_TYPE_AUDIO; |
4860abb1 |
/* 16 bit form will be handled as CODEC_ID_PCM_S16BE */
codec_id = CODEC_ID_PCM_DVD; |
aad512b4 |
} else if (startcode >= 0xb0 && startcode <= 0xbf) { |
72415b2a |
type = AVMEDIA_TYPE_AUDIO; |
9ba4821d |
codec_id = CODEC_ID_TRUEHD; |
aad512b4 |
} else if (startcode >= 0xc0 && startcode <= 0xcf) {
/* Used for both AC-3 and E-AC-3 in EVOB files */ |
72415b2a |
type = AVMEDIA_TYPE_AUDIO; |
aad512b4 |
codec_id = CODEC_ID_AC3; |
a9c3213f |
} else if (startcode >= 0x20 && startcode <= 0x3f) { |
72415b2a |
type = AVMEDIA_TYPE_SUBTITLE; |
a9c3213f |
codec_id = CODEC_ID_DVD_SUBTITLE; |
aad512b4 |
} else if (startcode >= 0xfd55 && startcode <= 0xfd5f) { |
72415b2a |
type = AVMEDIA_TYPE_VIDEO; |
aad512b4 |
codec_id = CODEC_ID_VC1; |
80e58c61 |
} else if (startcode == 0x1bd) {
// check dvd audio substream type |
72415b2a |
type = AVMEDIA_TYPE_AUDIO; |
80e58c61 |
switch(dvdaudio_substream_type & 0xe0) {
case 0xa0: codec_id = CODEC_ID_PCM_DVD;
break;
case 0x80: if((dvdaudio_substream_type & 0xf8) == 0x88)
codec_id = CODEC_ID_DTS;
else codec_id = CODEC_ID_AC3;
break;
default: av_log(s, AV_LOG_ERROR, "Unknown 0x1bd sub-stream\n");
goto skip;
} |
db7f1f95 |
} else {
skip:
/* skip packet */ |
899681cd |
url_fskip(s->pb, len); |
db7f1f95 |
goto redo;
} |
1e5c667c |
/* no stream found: add a new stream */
st = av_new_stream(s, startcode); |
115329f1 |
if (!st) |
1e5c667c |
goto skip; |
01f4895c |
st->codec->codec_type = type;
st->codec->codec_id = codec_id; |
27f388aa |
if (codec_id != CODEC_ID_PCM_S16BE) |
57004ff1 |
st->need_parsing = AVSTREAM_PARSE_FULL; |
de6d9b64 |
found: |
f3356e9c |
if(st->discard >= AVDISCARD_ALL) |
b9866ebc |
goto skip; |
80e58c61 |
if ((startcode >= 0xa0 && startcode <= 0xaf) ||
(startcode == 0x1bd && ((dvdaudio_substream_type & 0xe0) == 0xa0))) { |
9ec05e36 |
int b1, freq;
/* for LPCM, we just skip the header and consider it is raw
audio data */
if (len <= 3)
goto skip; |
899681cd |
get_byte(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
b1 = get_byte(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
get_byte(s->pb); /* dynamic range control (0x80 = off) */ |
9ec05e36 |
len -= 3;
freq = (b1 >> 4) & 3; |
01f4895c |
st->codec->sample_rate = lpcm_freq_tab[freq];
st->codec->channels = 1 + (b1 & 7); |
dd1c8f3e |
st->codec->bits_per_coded_sample = 16 + ((b1 >> 6) & 3) * 4; |
4860abb1 |
st->codec->bit_rate = st->codec->channels *
st->codec->sample_rate * |
dd1c8f3e |
st->codec->bits_per_coded_sample;
if (st->codec->bits_per_coded_sample == 16) |
4860abb1 |
st->codec->codec_id = CODEC_ID_PCM_S16BE; |
dd1c8f3e |
else if (st->codec->bits_per_coded_sample == 28) |
4860abb1 |
return AVERROR(EINVAL); |
9ec05e36 |
} |
de6d9b64 |
av_new_packet(pkt, len); |
899681cd |
get_buffer(s->pb, pkt->data, pkt->size); |
de6d9b64 |
pkt->pts = pts; |
27f388aa |
pkt->dts = dts; |
c45ebd54 |
pkt->pos = dummy_pos; |
db7f1f95 |
pkt->stream_index = st->index; |
27a206e0 |
#if 0 |
b9866ebc |
av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0, pkt->size); |
27a206e0 |
#endif |
0bd586c5 |
|
de6d9b64 |
return 0;
}
|
115329f1 |
static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index, |
8d14a25c |
int64_t *ppos, int64_t pos_limit) |
27f388aa |
{
int len, startcode;
int64_t pos, pts, dts;
pos = *ppos;
#ifdef DEBUG_SEEK |
949b1a13 |
printf("read_dts: pos=0x%"PRIx64" next=%d -> ", pos, find_next); |
27f388aa |
#endif |
5faf1689 |
if (url_fseek(s->pb, pos, SEEK_SET) < 0)
return AV_NOPTS_VALUE;
|
27f388aa |
for(;;) { |
8d14a25c |
len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts); |
27f388aa |
if (len < 0) {
#ifdef DEBUG_SEEK
printf("none (ret=%d)\n", len);
#endif
return AV_NOPTS_VALUE;
} |
115329f1 |
if (startcode == s->streams[stream_index]->id && |
27f388aa |
dts != AV_NOPTS_VALUE) {
break;
} |
899681cd |
url_fskip(s->pb, len); |
27f388aa |
}
#ifdef DEBUG_SEEK |
949b1a13 |
printf("pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", pos, dts, dts / 90000.0); |
27f388aa |
#endif
*ppos = pos; |
cdd5034f |
return dts; |
27f388aa |
}
|
d2a067d1 |
AVInputFormat mpegps_demuxer = { |
db7f1f95 |
"mpeg", |
bde15e74 |
NULL_IF_CONFIG_SMALL("MPEG-PS format"), |
db7f1f95 |
sizeof(MpegDemuxContext),
mpegps_probe,
mpegps_read_header,
mpegps_read_packet, |
9b64a036 |
NULL, |
8d14a25c |
NULL, //mpegps_read_seek,
mpegps_read_dts, |
ff9c8d7c |
.flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT, |
de6d9b64 |
}; |