blob: 54125ae9a2d10a4a0665b1f7e8acf8069fa0460d [file] [log] [blame]
Fabrice Bellardde6d9b62001-07-22 14:18:561/*
Baptiste Coudurier2abe5a02007-06-21 09:39:292 * MPEG1/2 demuxer
Diego Biurrun406792e2009-01-19 15:46:403 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
Fabrice Bellardde6d9b62001-07-22 14:18:564 *
Diego Biurrunb78e7192006-10-07 15:30:465 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
Fabrice Bellard19720f12002-05-25 22:34:328 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
Diego Biurrunb78e7192006-10-07 15:30:4610 * version 2.1 of the License, or (at your option) any later version.
Fabrice Bellardde6d9b62001-07-22 14:18:5611 *
Diego Biurrunb78e7192006-10-07 15:30:4612 * FFmpeg is distributed in the hope that it will be useful,
Fabrice Bellardde6d9b62001-07-22 14:18:5613 * but WITHOUT ANY WARRANTY; without even the implied warranty of
Fabrice Bellard19720f12002-05-25 22:34:3214 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
Fabrice Bellardde6d9b62001-07-22 14:18:5616 *
Fabrice Bellard19720f12002-05-25 22:34:3217 * You should have received a copy of the GNU Lesser General Public
Diego Biurrunb78e7192006-10-07 15:30:4618 * License along with FFmpeg; if not, write to the Free Software
Diego Biurrun5509bff2006-01-12 22:43:2619 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Fabrice Bellardde6d9b62001-07-22 14:18:5620 */
Fabrice Bellardde6d9b62001-07-22 14:18:5621
Baptiste Coudurier2abe5a02007-06-21 09:39:2922#include "avformat.h"
Anton Khirnovf8194672011-02-06 14:38:5523#include "internal.h"
Baptiste Coudurier2abe5a02007-06-21 09:39:2924#include "mpeg.h"
25
Michael Niedermayerb7549782004-01-13 22:02:4926#undef NDEBUG
27#include <assert.h>
28
Fabrice Bellardde6d9b62001-07-22 14:18:5629/*********************************************/
30/* demux code */
31
32#define MAX_SYNC_SIZE 100000
33
Michael Niedermayerc6dcd0d2007-11-03 13:48:3034static int check_pes(uint8_t *p, uint8_t *end){
35 int pes1;
36 int pes2= (p[3] & 0xC0) == 0x80
37 && (p[4] & 0xC0) != 0x40
38 &&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
39
40 for(p+=3; p<end && *p == 0xFF; p++);
41 if((*p&0xC0) == 0x40) p+=2;
42 if((*p&0xF0) == 0x20){
43 pes1= p[0]&p[2]&p[4]&1;
Michael Niedermayerc6dcd0d2007-11-03 13:48:3044 }else if((*p&0xF0) == 0x30){
45 pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
Michael Niedermayerc6dcd0d2007-11-03 13:48:3046 }else
47 pes1 = *p == 0x0F;
48
49 return pes1||pes2;
50}
51
Alex Conversefe21f782011-09-28 22:43:2452static int check_pack_header(const uint8_t *buf) {
53 return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
54}
55
Fabrice Bellarddb7f1f92002-05-20 16:29:4056static int mpegps_probe(AVProbeData *p)
57{
Michael Niedermayer9870a7b2006-02-08 17:35:4458 uint32_t code= -1;
Michael Niedermayer7e1720d2007-12-03 09:37:0659 int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
Michael Niedermayer95f97de2004-10-01 16:00:0060 int i;
Michael Niedermayera1c69e02006-08-19 08:39:0061 int score=0;
Fabrice Bellarddb7f1f92002-05-20 16:29:4062
Michael Niedermayer9870a7b2006-02-08 17:35:4463 for(i=0; i<p->buf_size; i++){
64 code = (code<<8) + p->buf[i];
Isaac Richardsec23a472003-07-10 09:04:0465 if ((code & 0xffffff00) == 0x100) {
Janne Grunau612dc022010-05-24 12:32:1366 int len= p->buf[i+1] << 8 | p->buf[i+2];
Michael Niedermayer0c904db2007-11-03 14:57:2667 int pes= check_pes(p->buf+i, p->buf+p->buf_size);
Alex Conversefe21f782011-09-28 22:43:2468 int pack = check_pack_header(p->buf+i);
Michael Niedermayerc6dcd0d2007-11-03 13:48:3069
Måns Rullgård25c533a2006-06-29 19:03:5370 if(code == SYSTEM_HEADER_START_CODE) sys++;
Alex Conversefe21f782011-09-28 22:43:2471 else if(code == PACK_START_CODE && pack) pspack++;
Michael Niedermayer274335e2008-08-26 01:29:4372 else if((code & 0xf0) == VIDEO_ID && pes) vid++;
Janne Grunau612dc022010-05-24 12:32:1373 // skip pes payload to avoid start code emulation for private
74 // and audio streams
75 else if((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
76 else if(code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
Michael Niedermayer2f9815d2011-03-09 00:07:3577 else if(code == 0x1fd && pes) vid++; //VC1
Michael Niedermayer7e1720d2007-12-03 09:37:0678
79 else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
80 else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
Janne Grunau612dc022010-05-24 12:32:1381 else if(code == PRIVATE_STREAM_1 && !pes) invalid++;
Isaac Richardsec23a472003-07-10 09:04:0482 }
Fabrice Bellarddb7f1f92002-05-20 16:29:4083 }
Michael Niedermayera1c69e02006-08-19 08:39:0084
Michael Niedermayer2f9815d2011-03-09 00:07:3585 if(vid+audio > invalid+1) /* invalid VDR files nd short PES streams */
Michael Niedermayera1c69e02006-08-19 08:39:0086 score= AVPROBE_SCORE_MAX/4;
87
Michael Niedermayer6de5b622009-12-08 12:24:4188//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d %d len:%d\n", sys, priv1, pspack,vid, audio, invalid, p->buf_size);
Michael Niedermayer7e1720d2007-12-03 09:37:0689 if(sys>invalid && sys*9 <= pspack*10)
Michael Niedermayer00ddf622012-07-31 01:59:2990 return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
Michael Niedermayer55f65242009-12-08 12:19:3091 if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9)
Michael Niedermayerc4674a42009-09-15 12:20:0392 return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
93 if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */
Michael Niedermayer31d82612012-08-03 00:45:0794 return (audio > 12 || vid > 3 + 2*invalid) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4;
Michael Niedermayera1c69e02006-08-19 08:39:0095
96 //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
Reimar Döffinger3489e152009-09-15 10:01:2597 //mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
Michael Niedermayer31d82612012-08-03 00:45:0798 //Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618
Michael Niedermayera1c69e02006-08-19 08:39:0099 return score;
Fabrice Bellarddb7f1f92002-05-20 16:29:40100}
101
102
Fabrice Bellardde6d9b62001-07-22 14:18:56103typedef struct MpegDemuxContext {
Måns Rullgård191e8ca2006-09-27 19:47:39104 int32_t header_state;
Måns Rullgårde3d1cd82005-03-28 17:33:21105 unsigned char psm_es_type[256];
Aurelien Jacobs8cd4ac32007-11-07 23:56:00106 int sofdec;
Fabrice Bellardde6d9b62001-07-22 14:18:56107} MpegDemuxContext;
108
Anton Khirnov6e9651d2012-01-12 12:20:36109static int mpegps_read_header(AVFormatContext *s)
Fabrice Bellard27f388a2003-11-10 18:47:52110{
111 MpegDemuxContext *m = s->priv_data;
Måns Rullgård2c187842007-11-08 21:27:37112 const char *sofdec = "Sofdec";
113 int v, i = 0;
Arne de Bruijnb2f230e2011-09-17 12:59:00114 int64_t last_pos = avio_tell(s->pb);
Aurelien Jacobs8cd4ac32007-11-07 23:56:00115
Fabrice Bellard27f388a2003-11-10 18:47:52116 m->header_state = 0xff;
117 s->ctx_flags |= AVFMTCTX_NOHEADER;
118
Måns Rullgård2c187842007-11-08 21:27:37119 m->sofdec = -1;
120 do {
Anton Khirnove63a3622011-02-21 15:43:01121 v = avio_r8(s->pb);
Måns Rullgård2c187842007-11-08 21:27:37122 m->sofdec++;
123 } while (v == sofdec[i] && i++ < 6);
Aurelien Jacobs8cd4ac32007-11-07 23:56:00124
[email protected]711e69a2009-10-20 15:27:05125 m->sofdec = (m->sofdec == 6) ? 1 : 0;
126
Arne de Bruijnb2f230e2011-09-17 12:59:00127 if (!m->sofdec)
128 avio_seek(s->pb, last_pos, SEEK_SET);
129
Fabrice Bellard27f388a2003-11-10 18:47:52130 /* no need to do more */
131 return 0;
132}
133
Anton Khirnov471fe572011-02-20 10:04:12134static int64_t get_pts(AVIOContext *pb, int c)
Fabrice Bellard27f388a2003-11-10 18:47:52135{
Ivo van Poorten66e9e302008-01-07 23:32:57136 uint8_t buf[5];
Fabrice Bellard27f388a2003-11-10 18:47:52137
Anton Khirnove63a3622011-02-21 15:43:01138 buf[0] = c<0 ? avio_r8(pb) : c;
139 avio_read(pb, buf+1, 4);
Ivo van Poorten66e9e302008-01-07 23:32:57140
141 return ff_parse_pes_pts(buf);
Fabrice Bellard27f388a2003-11-10 18:47:52142}
143
Anton Khirnov471fe572011-02-20 10:04:12144static int find_next_start_code(AVIOContext *pb, int *size_ptr,
Måns Rullgård191e8ca2006-09-27 19:47:39145 int32_t *header_state)
Fabrice Bellardde6d9b62001-07-22 14:18:56146{
147 unsigned int state, v;
148 int val, n;
149
150 state = *header_state;
151 n = *size_ptr;
152 while (n > 0) {
153 if (url_feof(pb))
154 break;
Anton Khirnove63a3622011-02-21 15:43:01155 v = avio_r8(pb);
Fabrice Bellardde6d9b62001-07-22 14:18:56156 n--;
157 if (state == 0x000001) {
158 state = ((state << 8) | v) & 0xffffff;
159 val = state;
160 goto found;
161 }
162 state = ((state << 8) | v) & 0xffffff;
163 }
164 val = -1;
165 found:
166 *header_state = state;
167 *size_ptr = n;
168 return val;
169}
170
Måns Rullgårde3d1cd82005-03-28 17:33:21171/**
Måns Rullgård49bd8e42010-06-30 15:38:06172 * Extract stream types from a program stream map
Måns Rullgårde3d1cd82005-03-28 17:33:21173 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
Diego Biurrun115329f2005-12-17 18:14:38174 *
Måns Rullgårde3d1cd82005-03-28 17:33:21175 * @return number of bytes occupied by PSM in the bitstream
176 */
Anton Khirnov471fe572011-02-20 10:04:12177static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
Måns Rullgårde3d1cd82005-03-28 17:33:21178{
179 int psm_length, ps_info_length, es_map_length;
180
Anton Khirnove63a3622011-02-21 15:43:01181 psm_length = avio_rb16(pb);
182 avio_r8(pb);
183 avio_r8(pb);
184 ps_info_length = avio_rb16(pb);
Måns Rullgårde3d1cd82005-03-28 17:33:21185
186 /* skip program_stream_info */
Anton Khirnov45a8a022011-03-15 08:14:38187 avio_skip(pb, ps_info_length);
Anton Khirnove63a3622011-02-21 15:43:01188 es_map_length = avio_rb16(pb);
Måns Rullgårde3d1cd82005-03-28 17:33:21189
190 /* at least one es available? */
191 while (es_map_length >= 4){
Anton Khirnove63a3622011-02-21 15:43:01192 unsigned char type = avio_r8(pb);
193 unsigned char es_id = avio_r8(pb);
194 uint16_t es_info_length = avio_rb16(pb);
Måns Rullgårde3d1cd82005-03-28 17:33:21195 /* remember mapping from stream id to stream type */
196 m->psm_es_type[es_id] = type;
197 /* skip program_stream_info */
Anton Khirnov45a8a022011-03-15 08:14:38198 avio_skip(pb, es_info_length);
Måns Rullgårde3d1cd82005-03-28 17:33:21199 es_map_length -= 4 + es_info_length;
200 }
Anton Khirnove63a3622011-02-21 15:43:01201 avio_rb32(pb); /* crc32 */
Måns Rullgårde3d1cd82005-03-28 17:33:21202 return 2 + psm_length;
203}
204
Diego Biurrun115329f2005-12-17 18:14:38205/* read the next PES header. Return its position in ppos
Fabrice Bellard27f388a2003-11-10 18:47:52206 (if not NULL), and its start code, pts and dts.
207 */
208static int mpegps_read_pes_header(AVFormatContext *s,
Diego Biurrun115329f2005-12-17 18:14:38209 int64_t *ppos, int *pstart_code,
Michael Niedermayer8d14a252004-04-12 16:50:03210 int64_t *ppts, int64_t *pdts)
Fabrice Bellardde6d9b62001-07-22 14:18:56211{
212 MpegDemuxContext *m = s->priv_data;
Fabrice Bellard27f388a2003-11-10 18:47:52213 int len, size, startcode, c, flags, header_len;
Michael Niedermayeraad512b2007-02-06 19:14:16214 int pes_ext, ext2_len, id_ext, skip;
Michael Niedermayere56cfad2007-01-17 10:19:10215 int64_t pts, dts;
Anton Khirnov384c9c22011-03-03 19:11:45216 int64_t last_sync= avio_tell(s->pb);
Fabrice Bellardde6d9b62001-07-22 14:18:56217
Michael Niedermayere56cfad2007-01-17 10:19:10218 error_redo:
Anton Khirnovf59d8ff2011-02-28 13:57:54219 avio_seek(s->pb, last_sync, SEEK_SET);
Fabrice Bellardde6d9b62001-07-22 14:18:56220 redo:
Fabrice Bellard27f388a2003-11-10 18:47:52221 /* next start code (should be immediately after) */
222 m->header_state = 0xff;
223 size = MAX_SYNC_SIZE;
Björn Axelsson899681c2007-11-21 07:41:00224 startcode = find_next_start_code(s->pb, &size, &m->header_state);
Anton Khirnov384c9c22011-03-03 19:11:45225 last_sync = avio_tell(s->pb);
226 //printf("startcode=%x pos=0x%"PRIx64"\n", startcode, avio_tell(s->pb));
Michael Niedermayer03323242010-02-10 14:25:57227 if (startcode < 0){
228 if(url_feof(s->pb))
229 return AVERROR_EOF;
230 //FIXME we should remember header_state
231 return AVERROR(EAGAIN);
232 }
233
Fabrice Bellardde6d9b62001-07-22 14:18:56234 if (startcode == PACK_START_CODE)
235 goto redo;
236 if (startcode == SYSTEM_HEADER_START_CODE)
237 goto redo;
Måns Rullgård2c187842007-11-08 21:27:37238 if (startcode == PADDING_STREAM) {
Anton Khirnov45a8a022011-03-15 08:14:38239 avio_skip(s->pb, avio_rb16(s->pb));
Måns Rullgård2c187842007-11-08 21:27:37240 goto redo;
241 }
242 if (startcode == PRIVATE_STREAM_2) {
Anton Khirnove63a3622011-02-21 15:43:01243 len = avio_rb16(s->pb);
Måns Rullgård2c187842007-11-08 21:27:37244 if (!m->sofdec) {
245 while (len-- >= 6) {
Anton Khirnove63a3622011-02-21 15:43:01246 if (avio_r8(s->pb) == 'S') {
Måns Rullgård2c187842007-11-08 21:27:37247 uint8_t buf[5];
Anton Khirnove63a3622011-02-21 15:43:01248 avio_read(s->pb, buf, sizeof(buf));
Måns Rullgård2c187842007-11-08 21:27:37249 m->sofdec = !memcmp(buf, "ofdec", 5);
250 len -= sizeof(buf);
251 break;
252 }
253 }
254 m->sofdec -= !m->sofdec;
255 }
Anton Khirnov45a8a022011-03-15 08:14:38256 avio_skip(s->pb, len);
Fabrice Bellardde6d9b62001-07-22 14:18:56257 goto redo;
258 }
Måns Rullgårde3d1cd82005-03-28 17:33:21259 if (startcode == PROGRAM_STREAM_MAP) {
Björn Axelsson899681c2007-11-21 07:41:00260 mpegps_psm_parse(m, s->pb);
Måns Rullgårde3d1cd82005-03-28 17:33:21261 goto redo;
262 }
Diego Biurrun115329f2005-12-17 18:14:38263
Fabrice Bellardde6d9b62001-07-22 14:18:56264 /* find matching stream */
265 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
266 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
Michael Niedermayeraad512b2007-02-06 19:14:16267 (startcode == 0x1bd) || (startcode == 0x1fd)))
Fabrice Bellardde6d9b62001-07-22 14:18:56268 goto redo;
Fabrice Bellard27f388a2003-11-10 18:47:52269 if (ppos) {
Anton Khirnov384c9c22011-03-03 19:11:45270 *ppos = avio_tell(s->pb) - 4;
Fabrice Bellard27f388a2003-11-10 18:47:52271 }
Anton Khirnove63a3622011-02-21 15:43:01272 len = avio_rb16(s->pb);
Michael Niedermayer75a9fbb2007-01-17 10:45:59273 pts =
Fabrice Bellardb2cac182002-10-21 15:57:21274 dts = AV_NOPTS_VALUE;
Fabrice Bellardde6d9b62001-07-22 14:18:56275 /* stuffing */
276 for(;;) {
Fabrice Bellard27f388a2003-11-10 18:47:52277 if (len < 1)
Michael Niedermayere56cfad2007-01-17 10:19:10278 goto error_redo;
Anton Khirnove63a3622011-02-21 15:43:01279 c = avio_r8(s->pb);
Fabrice Bellardde6d9b62001-07-22 14:18:56280 len--;
281 /* XXX: for mpeg1, should test only bit 7 */
Diego Biurrun115329f2005-12-17 18:14:38282 if (c != 0xff)
Fabrice Bellardde6d9b62001-07-22 14:18:56283 break;
284 }
285 if ((c & 0xc0) == 0x40) {
286 /* buffer scale & size */
Anton Khirnove63a3622011-02-21 15:43:01287 avio_r8(s->pb);
288 c = avio_r8(s->pb);
Fabrice Bellardde6d9b62001-07-22 14:18:56289 len -= 2;
290 }
Michael Niedermayerb90ba242007-01-17 10:55:01291 if ((c & 0xe0) == 0x20) {
Björn Axelsson899681c2007-11-21 07:41:00292 dts = pts = get_pts(s->pb, c);
Fabrice Bellardde6d9b62001-07-22 14:18:56293 len -= 4;
Michael Niedermayerb90ba242007-01-17 10:55:01294 if (c & 0x10){
Björn Axelsson899681c2007-11-21 07:41:00295 dts = get_pts(s->pb, -1);
Michael Niedermayerb90ba242007-01-17 10:55:01296 len -= 5;
297 }
Fabrice Bellardde6d9b62001-07-22 14:18:56298 } else if ((c & 0xc0) == 0x80) {
299 /* mpeg 2 PES */
Anton Khirnove63a3622011-02-21 15:43:01300 flags = avio_r8(s->pb);
301 header_len = avio_r8(s->pb);
Fabrice Bellardde6d9b62001-07-22 14:18:56302 len -= 2;
303 if (header_len > len)
Michael Niedermayere56cfad2007-01-17 10:19:10304 goto error_redo;
Michael Niedermayer80036202007-01-17 12:06:31305 len -= header_len;
Michael Niedermayerb90ba242007-01-17 10:55:01306 if (flags & 0x80) {
Björn Axelsson899681c2007-11-21 07:41:00307 dts = pts = get_pts(s->pb, -1);
Fabrice Bellardde6d9b62001-07-22 14:18:56308 header_len -= 5;
Michael Niedermayerb90ba242007-01-17 10:55:01309 if (flags & 0x40) {
Björn Axelsson899681c2007-11-21 07:41:00310 dts = get_pts(s->pb, -1);
Michael Niedermayerb90ba242007-01-17 10:55:01311 header_len -= 5;
Michael Niedermayerb90ba242007-01-17 10:55:01312 }
Fabrice Bellardde6d9b62001-07-22 14:18:56313 }
Michael Niedermayer675b8392008-03-04 01:31:15314 if (flags & 0x3f && header_len == 0){
315 flags &= 0xC0;
316 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
317 }
Michael Niedermayeraad512b2007-02-06 19:14:16318 if (flags & 0x01) { /* PES extension */
Anton Khirnove63a3622011-02-21 15:43:01319 pes_ext = avio_r8(s->pb);
Michael Niedermayeraad512b2007-02-06 19:14:16320 header_len--;
Michael Niedermayeraad512b2007-02-06 19:14:16321 /* Skip PES private data, program packet sequence counter and P-STD buffer */
322 skip = (pes_ext >> 4) & 0xb;
323 skip += skip & 0x9;
Michael Niedermayerb22d0c02008-04-29 00:12:49324 if (pes_ext & 0x40 || skip > header_len){
325 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
326 pes_ext=skip=0;
327 }
Anton Khirnov45a8a022011-03-15 08:14:38328 avio_skip(s->pb, skip);
Michael Niedermayeraad512b2007-02-06 19:14:16329 header_len -= skip;
330
331 if (pes_ext & 0x01) { /* PES extension 2 */
Anton Khirnove63a3622011-02-21 15:43:01332 ext2_len = avio_r8(s->pb);
Michael Niedermayeraad512b2007-02-06 19:14:16333 header_len--;
334 if ((ext2_len & 0x7f) > 0) {
Anton Khirnove63a3622011-02-21 15:43:01335 id_ext = avio_r8(s->pb);
Michael Niedermayeraad512b2007-02-06 19:14:16336 if ((id_ext & 0x80) == 0)
337 startcode = ((startcode & 0xff) << 8) | id_ext;
338 header_len--;
339 }
340 }
341 }
Michael Niedermayer80036202007-01-17 12:06:31342 if(header_len < 0)
343 goto error_redo;
Anton Khirnov45a8a022011-03-15 08:14:38344 avio_skip(s->pb, header_len);
Fabrice Bellardde6d9b62001-07-22 14:18:56345 }
Dmitry Borisovdf70de12004-04-23 21:02:01346 else if( c!= 0xf )
347 goto redo;
348
Michael Niedermayerafa6afc2012-07-31 17:20:00349 if (startcode == PRIVATE_STREAM_1) {
Anton Khirnove63a3622011-02-21 15:43:01350 startcode = avio_r8(s->pb);
Fabrice Bellardde6d9b62001-07-22 14:18:56351 len--;
Fabrice Bellardde6d9b62001-07-22 14:18:56352 }
Michael Niedermayer7e4709b2007-01-17 10:44:57353 if(len<0)
354 goto error_redo;
Michael Niedermayerb7549782004-01-13 22:02:49355 if(dts != AV_NOPTS_VALUE && ppos){
356 int i;
357 for(i=0; i<s->nb_streams; i++){
Michel Bardiaux6ba90c22008-01-14 16:11:08358 if(startcode == s->streams[i]->id &&
Anton Khirnov8978fed2011-03-05 20:06:46359 s->pb->seekable /* index useless on streams anyway */) {
Paul Kelly3dea63b2008-01-13 13:33:37360 ff_reduce_index(s, i);
Michael Niedermayer30a43f22006-03-01 11:29:55361 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
Michael Niedermayerb7549782004-01-13 22:02:49362 }
363 }
364 }
Diego Biurrun115329f2005-12-17 18:14:38365
Fabrice Bellard27f388a2003-11-10 18:47:52366 *pstart_code = startcode;
367 *ppts = pts;
368 *pdts = dts;
369 return len;
370}
371
372static int mpegps_read_packet(AVFormatContext *s,
373 AVPacket *pkt)
374{
Måns Rullgårde3d1cd82005-03-28 17:33:21375 MpegDemuxContext *m = s->priv_data;
Fabrice Bellard27f388a2003-11-10 18:47:52376 AVStream *st;
Alex Converse9fba8eb2011-09-23 23:28:23377 int len, startcode, i, es_type, ret;
Michael Niedermayer759901f2012-07-31 18:54:33378 int lpcm_header_len;
Michael Niedermayer5b56ad02011-03-04 00:12:17379 int request_probe= 0;
Anton Khirnov36ef5362012-08-05 09:11:04380 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
Stefano Sabatini72415b22010-03-30 23:30:55381 enum AVMediaType type;
Michael Niedermayerb7549782004-01-13 22:02:49382 int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
Fabrice Bellard27f388a2003-11-10 18:47:52383
384 redo:
Michael Niedermayer8d14a252004-04-12 16:50:03385 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
Fabrice Bellard27f388a2003-11-10 18:47:52386 if (len < 0)
387 return len;
Diego Biurrun115329f2005-12-17 18:14:38388
Michael Niedermayerce7cf602012-07-31 17:43:20389 if (startcode >= 0x80 && startcode <= 0xcf) {
390 if(len < 4)
391 goto skip;
392
393 /* audio: skip header */
394 avio_r8(s->pb);
Michael Niedermayer759901f2012-07-31 18:54:33395 lpcm_header_len = avio_rb16(s->pb);
Michael Niedermayerce7cf602012-07-31 17:43:20396 len -= 3;
397 if (startcode >= 0xb0 && startcode <= 0xbf) {
398 /* MLP/TrueHD audio has a 4-byte header */
399 avio_r8(s->pb);
400 len--;
401 }
402 }
403
Fabrice Bellardde6d9b62001-07-22 14:18:56404 /* now find stream */
405 for(i=0;i<s->nb_streams;i++) {
406 st = s->streams[i];
407 if (st->id == startcode)
408 goto found;
409 }
Måns Rullgårde3d1cd82005-03-28 17:33:21410
411 es_type = m->psm_es_type[startcode & 0xff];
Benoit Fouet80e58c62009-02-11 11:09:36412 if(es_type > 0 && es_type != STREAM_TYPE_PRIVATE_DATA){
Måns Rullgårde3d1cd82005-03-28 17:33:21413 if(es_type == STREAM_TYPE_VIDEO_MPEG1){
Anton Khirnov36ef5362012-08-05 09:11:04414 codec_id = AV_CODEC_ID_MPEG2VIDEO;
Stefano Sabatini72415b22010-03-30 23:30:55415 type = AVMEDIA_TYPE_VIDEO;
Måns Rullgårde3d1cd82005-03-28 17:33:21416 } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
Anton Khirnov36ef5362012-08-05 09:11:04417 codec_id = AV_CODEC_ID_MPEG2VIDEO;
Stefano Sabatini72415b22010-03-30 23:30:55418 type = AVMEDIA_TYPE_VIDEO;
Måns Rullgårde3d1cd82005-03-28 17:33:21419 } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
420 es_type == STREAM_TYPE_AUDIO_MPEG2){
Anton Khirnov36ef5362012-08-05 09:11:04421 codec_id = AV_CODEC_ID_MP3;
Stefano Sabatini72415b22010-03-30 23:30:55422 type = AVMEDIA_TYPE_AUDIO;
Måns Rullgårde3d1cd82005-03-28 17:33:21423 } else if(es_type == STREAM_TYPE_AUDIO_AAC){
Anton Khirnov36ef5362012-08-05 09:11:04424 codec_id = AV_CODEC_ID_AAC;
Stefano Sabatini72415b22010-03-30 23:30:55425 type = AVMEDIA_TYPE_AUDIO;
Måns Rullgårde3d1cd82005-03-28 17:33:21426 } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
Anton Khirnov36ef5362012-08-05 09:11:04427 codec_id = AV_CODEC_ID_MPEG4;
Stefano Sabatini72415b22010-03-30 23:30:55428 type = AVMEDIA_TYPE_VIDEO;
Måns Rullgårde3d1cd82005-03-28 17:33:21429 } else if(es_type == STREAM_TYPE_VIDEO_H264){
Anton Khirnov36ef5362012-08-05 09:11:04430 codec_id = AV_CODEC_ID_H264;
Stefano Sabatini72415b22010-03-30 23:30:55431 type = AVMEDIA_TYPE_VIDEO;
Måns Rullgårde3d1cd82005-03-28 17:33:21432 } else if(es_type == STREAM_TYPE_AUDIO_AC3){
Anton Khirnov36ef5362012-08-05 09:11:04433 codec_id = AV_CODEC_ID_AC3;
Stefano Sabatini72415b22010-03-30 23:30:55434 type = AVMEDIA_TYPE_AUDIO;
Måns Rullgårde3d1cd82005-03-28 17:33:21435 } else {
436 goto skip;
437 }
438 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
Måns Rullgård83d07312006-07-03 21:40:01439 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
440 unsigned char buf[8];
Anton Khirnove63a3622011-02-21 15:43:01441 avio_read(s->pb, buf, 8);
Anton Khirnovf59d8ff2011-02-28 13:57:54442 avio_seek(s->pb, -8, SEEK_CUR);
Måns Rullgård83d07312006-07-03 21:40:01443 if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
Anton Khirnov36ef5362012-08-05 09:11:04444 codec_id = AV_CODEC_ID_CAVS;
Måns Rullgård83d07312006-07-03 21:40:01445 else
Michael Niedermayer5b56ad02011-03-04 00:12:17446 request_probe= 1;
Stefano Sabatini72415b22010-03-30 23:30:55447 type = AVMEDIA_TYPE_VIDEO;
Fabrice Bellarddb7f1f92002-05-20 16:29:40448 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
Stefano Sabatini72415b22010-03-30 23:30:55449 type = AVMEDIA_TYPE_AUDIO;
Anton Khirnov36ef5362012-08-05 09:11:04450 codec_id = m->sofdec > 0 ? AV_CODEC_ID_ADPCM_ADX : AV_CODEC_ID_MP2;
Joakim Plate3f2bf072005-05-20 13:10:09451 } else if (startcode >= 0x80 && startcode <= 0x87) {
Stefano Sabatini72415b22010-03-30 23:30:55452 type = AVMEDIA_TYPE_AUDIO;
Anton Khirnov36ef5362012-08-05 09:11:04453 codec_id = AV_CODEC_ID_AC3;
Michael Niedermayer274335e2008-08-26 01:29:43454 } else if ( ( startcode >= 0x88 && startcode <= 0x8f)
Michael Niedermayeraad512b2007-02-06 19:14:16455 ||( startcode >= 0x98 && startcode <= 0x9f)) {
456 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
Stefano Sabatini72415b22010-03-30 23:30:55457 type = AVMEDIA_TYPE_AUDIO;
Anton Khirnov36ef5362012-08-05 09:11:04458 codec_id = AV_CODEC_ID_DTS;
Michael Niedermayeraad512b2007-02-06 19:14:16459 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
Stefano Sabatini72415b22010-03-30 23:30:55460 type = AVMEDIA_TYPE_AUDIO;
Michael Niedermayer759901f2012-07-31 18:54:33461 if(lpcm_header_len == 6) {
Michael Niedermayer7a726952012-08-07 20:45:46462 codec_id = AV_CODEC_ID_MLP;
Michael Niedermayer759901f2012-07-31 18:54:33463 } else {
Michael Niedermayer7a726952012-08-07 20:45:46464 /* 16 bit form will be handled as AV_CODEC_ID_PCM_S16BE */
465 codec_id = AV_CODEC_ID_PCM_DVD;
Michael Niedermayer759901f2012-07-31 18:54:33466 }
Michael Niedermayeraad512b2007-02-06 19:14:16467 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
Stefano Sabatini72415b22010-03-30 23:30:55468 type = AVMEDIA_TYPE_AUDIO;
Anton Khirnov36ef5362012-08-05 09:11:04469 codec_id = AV_CODEC_ID_TRUEHD;
Michael Niedermayeraad512b2007-02-06 19:14:16470 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
471 /* Used for both AC-3 and E-AC-3 in EVOB files */
Stefano Sabatini72415b22010-03-30 23:30:55472 type = AVMEDIA_TYPE_AUDIO;
Anton Khirnov36ef5362012-08-05 09:11:04473 codec_id = AV_CODEC_ID_AC3;
Fabrice Bellarda9c32132005-06-03 14:01:49474 } else if (startcode >= 0x20 && startcode <= 0x3f) {
Stefano Sabatini72415b22010-03-30 23:30:55475 type = AVMEDIA_TYPE_SUBTITLE;
Anton Khirnov36ef5362012-08-05 09:11:04476 codec_id = AV_CODEC_ID_DVD_SUBTITLE;
Michael Niedermayeraad512b2007-02-06 19:14:16477 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
Stefano Sabatini72415b22010-03-30 23:30:55478 type = AVMEDIA_TYPE_VIDEO;
Anton Khirnov36ef5362012-08-05 09:11:04479 codec_id = AV_CODEC_ID_VC1;
Fabrice Bellarddb7f1f92002-05-20 16:29:40480 } else {
481 skip:
482 /* skip packet */
Anton Khirnov45a8a022011-03-15 08:14:38483 avio_skip(s->pb, len);
Fabrice Bellarddb7f1f92002-05-20 16:29:40484 goto redo;
485 }
Fabrice Bellard1e5c6672002-10-04 15:46:59486 /* no stream found: add a new stream */
Anton Khirnov84ad31f2011-06-18 09:43:24487 st = avformat_new_stream(s, NULL);
Diego Biurrun115329f2005-12-17 18:14:38488 if (!st)
Fabrice Bellard1e5c6672002-10-04 15:46:59489 goto skip;
Anton Khirnov84ad31f2011-06-18 09:43:24490 st->id = startcode;
Michael Niedermayer01f48952005-07-17 22:24:36491 st->codec->codec_type = type;
492 st->codec->codec_id = codec_id;
Michael Niedermayer5b56ad02011-03-04 00:12:17493 st->request_probe = request_probe;
Anton Khirnov36ef5362012-08-05 09:11:04494 if (codec_id != AV_CODEC_ID_PCM_S16BE)
Aurelien Jacobs57004ff2007-04-15 13:51:57495 st->need_parsing = AVSTREAM_PARSE_FULL;
Fabrice Bellardde6d9b62001-07-22 14:18:56496 found:
Michael Niedermayerf3356e92005-03-17 01:25:01497 if(st->discard >= AVDISCARD_ALL)
Michael Niedermayerb9866eb2005-01-22 13:36:02498 goto skip;
Michael Niedermayerafa6afc2012-07-31 17:20:00499 if (startcode >= 0xa0 && startcode <= 0xaf) {
Michael Niedermayer759901f2012-07-31 18:54:33500 if (lpcm_header_len == 6) {
501 if (len < 6)
502 goto skip;
503 avio_skip(s->pb, 6);
504 len -=6;
505 } else {
Fabrice Bellard9ec05e32003-01-31 17:04:46506 int b1, freq;
Fabrice Bellard9ec05e32003-01-31 17:04:46507
508 /* for LPCM, we just skip the header and consider it is raw
509 audio data */
510 if (len <= 3)
511 goto skip;
Anton Khirnove63a3622011-02-21 15:43:01512 avio_r8(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
513 b1 = avio_r8(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
514 avio_r8(s->pb); /* dynamic range control (0x80 = off) */
Fabrice Bellard9ec05e32003-01-31 17:04:46515 len -= 3;
516 freq = (b1 >> 4) & 3;
Michael Niedermayer01f48952005-07-17 22:24:36517 st->codec->sample_rate = lpcm_freq_tab[freq];
518 st->codec->channels = 1 + (b1 & 7);
Luca Abenidd1c8f32008-09-08 14:24:59519 st->codec->bits_per_coded_sample = 16 + ((b1 >> 6) & 3) * 4;
Lars Täuber4860abb2008-05-21 02:26:42520 st->codec->bit_rate = st->codec->channels *
521 st->codec->sample_rate *
Luca Abenidd1c8f32008-09-08 14:24:59522 st->codec->bits_per_coded_sample;
523 if (st->codec->bits_per_coded_sample == 16)
Anton Khirnov36ef5362012-08-05 09:11:04524 st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
Luca Abenidd1c8f32008-09-08 14:24:59525 else if (st->codec->bits_per_coded_sample == 28)
Lars Täuber4860abb2008-05-21 02:26:42526 return AVERROR(EINVAL);
Michael Niedermayer759901f2012-07-31 18:54:33527 }
Fabrice Bellard9ec05e32003-01-31 17:04:46528 }
Alex Converse98ef8872011-10-08 00:02:36529 ret = av_get_packet(s->pb, pkt, len);
Fabrice Bellardde6d9b62001-07-22 14:18:56530 pkt->pts = pts;
Fabrice Bellard27f388a2003-11-10 18:47:52531 pkt->dts = dts;
Michael Niedermayerc45ebd52010-02-02 16:47:51532 pkt->pos = dummy_pos;
Fabrice Bellarddb7f1f92002-05-20 16:29:40533 pkt->stream_index = st->index;
Diego Biurrunb751f612011-06-02 18:40:09534 av_dlog(s, "%d: pts=%0.3f dts=%0.3f size=%d\n",
Diego Biurrun045dd4b2011-04-29 15:27:01535 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
536 pkt->size);
Mike Melanson0bd586c2004-06-19 03:59:34537
Alex Converse9fba8eb2011-09-23 23:28:23538 return (ret < 0) ? ret : 0;
Fabrice Bellardde6d9b62001-07-22 14:18:56539}
540
Diego Biurrun115329f2005-12-17 18:14:38541static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
Michael Niedermayer8d14a252004-04-12 16:50:03542 int64_t *ppos, int64_t pos_limit)
Fabrice Bellard27f388a2003-11-10 18:47:52543{
544 int len, startcode;
545 int64_t pos, pts, dts;
546
547 pos = *ppos;
Anton Khirnovf59d8ff2011-02-28 13:57:54548 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
Joakim Plate5faf1682008-05-29 09:50:17549 return AV_NOPTS_VALUE;
550
Fabrice Bellard27f388a2003-11-10 18:47:52551 for(;;) {
Michael Niedermayer8d14a252004-04-12 16:50:03552 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
Fabrice Bellard27f388a2003-11-10 18:47:52553 if (len < 0) {
Diego Biurrun919d7a32011-06-07 11:18:12554 av_dlog(s, "none (ret=%d)\n", len);
Fabrice Bellard27f388a2003-11-10 18:47:52555 return AV_NOPTS_VALUE;
556 }
Diego Biurrun115329f2005-12-17 18:14:38557 if (startcode == s->streams[stream_index]->id &&
Fabrice Bellard27f388a2003-11-10 18:47:52558 dts != AV_NOPTS_VALUE) {
559 break;
560 }
Anton Khirnov45a8a022011-03-15 08:14:38561 avio_skip(s->pb, len);
Fabrice Bellard27f388a2003-11-10 18:47:52562 }
Diego Biurrun919d7a32011-06-07 11:18:12563 av_dlog(s, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
564 pos, dts, dts / 90000.0);
Fabrice Bellard27f388a2003-11-10 18:47:52565 *ppos = pos;
Michael Niedermayercdd50342004-05-23 16:26:12566 return dts;
Fabrice Bellard27f388a2003-11-10 18:47:52567}
568
Diego Elio Pettenò66355be2011-01-25 22:03:28569AVInputFormat ff_mpegps_demuxer = {
Anton Khirnovdfc2c4d2011-07-16 20:18:12570 .name = "mpeg",
Diego Biurrun0177b7d2012-07-24 01:23:48571 .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
Anton Khirnovdfc2c4d2011-07-16 20:18:12572 .priv_data_size = sizeof(MpegDemuxContext),
573 .read_probe = mpegps_probe,
574 .read_header = mpegps_read_header,
575 .read_packet = mpegps_read_packet,
Anton Khirnovdfc2c4d2011-07-16 20:18:12576 .read_timestamp = mpegps_read_dts,
Martin Storsjö20234a42012-04-06 14:50:48577 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
Fabrice Bellarddb7f1f92002-05-20 16:29:40578};