libavformat/mpegenc.c

   1 /*
   2  * MPEG1/2 muxer
   3  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/fifo.h"
  23 #include "libavcodec/put_bits.h"
  24 #include "avformat.h"
  25 #include "mpeg.h"
  26
  27 #define MAX_PAYLOAD_SIZE 4096
  28 //#define DEBUG_SEEK
  29
  30 #undef NDEBUG
  31 #include <assert.h>
  32
  33 typedef struct PacketDesc {
  34     int64_t pts;
  35     int64_t dts;
  36     int size;
  37     int unwritten_size;
  38     int flags;
  39     struct PacketDesc *next;
  40 } PacketDesc;
  41
  42 typedef struct {
  43     AVFifoBuffer *fifo;
  44     uint8_t id;
  45     int max_buffer_size; /* in bytes */
  46     int buffer_index;
  47     PacketDesc *predecode_packet;
  48     PacketDesc *premux_packet;
  49     PacketDesc **next_packet;
  50     int packet_number;
  51     uint8_t lpcm_header[3];
  52     int lpcm_align;
  53     int bytes_to_iframe;
  54     int align_iframe;
  55     int64_t vobu_start_pts;
  56 } StreamInfo;
  57
  58 typedef struct {
  59     int packet_size; /* required packet size */
  60     int packet_number;
  61     int pack_header_freq;     /* frequency (in packets^-1) at which we send pack headers */
  62     int system_header_freq;
  63     int system_header_size;
  64     int mux_rate; /* bitrate in units of 50 bytes/s */
  65     /* stream info */
  66     int audio_bound;
  67     int video_bound;
  68     int is_mpeg2;
  69     int is_vcd;
  70     int is_svcd;
  71     int is_dvd;
  72     int64_t last_scr; /* current system clock */
  73
  74     double vcd_padding_bitrate; //FIXME floats
  75     int64_t vcd_padding_bytes_written;
  76
  77 } MpegMuxContext;
  78
  79 extern AVOutputFormat mpeg1vcd_muxer;
  80 extern AVOutputFormat mpeg2dvd_muxer;
  81 extern AVOutputFormat mpeg2svcd_muxer;
  82 extern AVOutputFormat mpeg2vob_muxer;
  83
  84 static int put_pack_header(AVFormatContext *ctx,
  85                            uint8_t *buf, int64_t timestamp)
  86 {
  87     MpegMuxContext *s = ctx->priv_data;
  88     PutBitContext pb;
  89
  90     init_put_bits(&pb, buf, 128);
  91
  92     put_bits(&pb, 32, PACK_START_CODE);
  93     if (s->is_mpeg2) {
  94         put_bits(&pb, 2, 0x1);
  95     } else {
  96         put_bits(&pb, 4, 0x2);
  97     }
  98     put_bits(&pb, 3,  (uint32_t)((timestamp >> 30) & 0x07));
  99     put_bits(&pb, 1, 1);
 100     put_bits(&pb, 15, (uint32_t)((timestamp >> 15) & 0x7fff));
 101     put_bits(&pb, 1, 1);
 102     put_bits(&pb, 15, (uint32_t)((timestamp      ) & 0x7fff));
 103     put_bits(&pb, 1, 1);
 104     if (s->is_mpeg2) {
 105         /* clock extension */
 106         put_bits(&pb, 9, 0);
 107     }
 108     put_bits(&pb, 1, 1);
 109     put_bits(&pb, 22, s->mux_rate);
 110     put_bits(&pb, 1, 1);
 111     if (s->is_mpeg2) {
 112         put_bits(&pb, 1, 1);
 113         put_bits(&pb, 5, 0x1f); /* reserved */
 114         put_bits(&pb, 3, 0); /* stuffing length */
 115     }
 116     flush_put_bits(&pb);
 117     return put_bits_ptr(&pb) - pb.buf;
 118 }
 119
 120 static int put_system_header(AVFormatContext *ctx, uint8_t *buf,int only_for_stream_id)
 121 {
 122     MpegMuxContext *s = ctx->priv_data;
 123     int size, i, private_stream_coded, id;
 124     PutBitContext pb;
 125
 126     init_put_bits(&pb, buf, 128);
 127
 128     put_bits(&pb, 32, SYSTEM_HEADER_START_CODE);
 129     put_bits(&pb, 16, 0);
 130     put_bits(&pb, 1, 1);
 131
 132     put_bits(&pb, 22, s->mux_rate); /* maximum bit rate of the multiplexed stream */
 133     put_bits(&pb, 1, 1); /* marker */
 134     if (s->is_vcd && only_for_stream_id==VIDEO_ID) {
 135         /* This header applies only to the video stream (see VCD standard p. IV-7)*/
 136         put_bits(&pb, 6, 0);
 137     } else
 138         put_bits(&pb, 6, s->audio_bound);
 139
 140     if (s->is_vcd) {
 141         /* see VCD standard, p. IV-7*/
 142         put_bits(&pb, 1, 0);
 143         put_bits(&pb, 1, 1);
 144     } else {
 145         put_bits(&pb, 1, 0); /* variable bitrate*/
 146         put_bits(&pb, 1, 0); /* non constrainted bit stream */
 147     }
 148
 149     if (s->is_vcd || s->is_dvd) {
 150         /* see VCD standard p IV-7 */
 151         put_bits(&pb, 1, 1); /* audio locked */
 152         put_bits(&pb, 1, 1); /* video locked */
 153     } else {
 154         put_bits(&pb, 1, 0); /* audio locked */
 155         put_bits(&pb, 1, 0); /* video locked */
 156     }
 157
 158     put_bits(&pb, 1, 1); /* marker */
 159
 160     if (s->is_vcd && only_for_stream_id==AUDIO_ID) {
 161         /* This header applies only to the audio stream (see VCD standard p. IV-7)*/
 162         put_bits(&pb, 5, 0);
 163     } else
 164         put_bits(&pb, 5, s->video_bound);
 165
 166     if (s->is_dvd) {
 167         put_bits(&pb, 1, 0);    /* packet_rate_restriction_flag */
 168         put_bits(&pb, 7, 0x7f); /* reserved byte */
 169     } else
 170         put_bits(&pb, 8, 0xff); /* reserved byte */
 171
 172     /* DVD-Video Stream_bound entries
 173     id (0xB9) video, maximum P-STD for stream 0xE0. (P-STD_buffer_bound_scale = 1)
 174     id (0xB8) audio, maximum P-STD for any MPEG audio (0xC0 to 0xC7) streams. If there are none set to 4096 (32x128). (P-STD_buffer_bound_scale = 0)
 175     id (0xBD) private stream 1 (audio other than MPEG and subpictures). (P-STD_buffer_bound_scale = 1)
 176     id (0xBF) private stream 2, NAV packs, set to 2x1024. */
 177     if (s->is_dvd) {
 178
 179         int P_STD_max_video = 0;
 180         int P_STD_max_mpeg_audio = 0;
 181         int P_STD_max_mpeg_PS1 = 0;
 182
 183         for(i=0;i<ctx->nb_streams;i++) {
 184             StreamInfo *stream = ctx->streams[i]->priv_data;
 185
 186             id = stream->id;
 187             if (id == 0xbd && stream->max_buffer_size > P_STD_max_mpeg_PS1) {
 188                 P_STD_max_mpeg_PS1 = stream->max_buffer_size;
 189             } else if (id >= 0xc0 && id <= 0xc7 && stream->max_buffer_size > P_STD_max_mpeg_audio) {
 190                 P_STD_max_mpeg_audio = stream->max_buffer_size;
 191             } else if (id == 0xe0 && stream->max_buffer_size > P_STD_max_video) {
 192                 P_STD_max_video = stream->max_buffer_size;
 193             }
 194         }
 195
 196         /* video */
 197         put_bits(&pb, 8, 0xb9); /* stream ID */
 198         put_bits(&pb, 2, 3);
 199         put_bits(&pb, 1, 1);
 200         put_bits(&pb, 13, P_STD_max_video / 1024);
 201
 202         /* audio */
 203         if (P_STD_max_mpeg_audio == 0)
 204             P_STD_max_mpeg_audio = 4096;
 205         put_bits(&pb, 8, 0xb8); /* stream ID */
 206         put_bits(&pb, 2, 3);
 207         put_bits(&pb, 1, 0);
 208         put_bits(&pb, 13, P_STD_max_mpeg_audio / 128);
 209
 210         /* private stream 1 */
 211         put_bits(&pb, 8, 0xbd); /* stream ID */
 212         put_bits(&pb, 2, 3);
 213         put_bits(&pb, 1, 0);
 214         put_bits(&pb, 13, P_STD_max_mpeg_PS1 / 128);
 215
 216         /* private stream 2 */
 217         put_bits(&pb, 8, 0xbf); /* stream ID */
 218         put_bits(&pb, 2, 3);
 219         put_bits(&pb, 1, 1);
 220         put_bits(&pb, 13, 2);
 221     }
 222     else {
 223         /* audio stream info */
 224         private_stream_coded = 0;
 225         for(i=0;i<ctx->nb_streams;i++) {
 226             StreamInfo *stream = ctx->streams[i]->priv_data;
 227
 228
 229             /* For VCDs, only include the stream info for the stream
 230             that the pack which contains this system belongs to.
 231             (see VCD standard p. IV-7) */
 232             if ( !s->is_vcd || stream->id==only_for_stream_id
 233                 || only_for_stream_id==0) {
 234
 235                 id = stream->id;
 236                 if (id < 0xc0) {
 237                     /* special case for private streams (AC-3 uses that) */
 238                     if (private_stream_coded)
 239                         continue;
 240                     private_stream_coded = 1;
 241                     id = 0xbd;
 242                 }
 243                 put_bits(&pb, 8, id); /* stream ID */
 244                 put_bits(&pb, 2, 3);
 245                 if (id < 0xe0) {
 246                     /* audio */
 247                     put_bits(&pb, 1, 0);
 248                     put_bits(&pb, 13, stream->max_buffer_size / 128);
 249                 } else {
 250                     /* video */
 251                     put_bits(&pb, 1, 1);
 252                     put_bits(&pb, 13, stream->max_buffer_size / 1024);
 253                 }
 254             }
 255         }
 256     }
 257
 258     flush_put_bits(&pb);
 259     size = put_bits_ptr(&pb) - pb.buf;
 260     /* patch packet size */
 261     buf[4] = (size - 6) >> 8;
 262     buf[5] = (size - 6) & 0xff;
 263
 264     return size;
 265 }
 266
 267 static int get_system_header_size(AVFormatContext *ctx)
 268 {
 269     int buf_index, i, private_stream_coded;
 270     StreamInfo *stream;
 271     MpegMuxContext *s = ctx->priv_data;
 272
 273     if (s->is_dvd)
 274        return 18; // DVD-Video system headers are 18 bytes fixed length.
 275
 276     buf_index = 12;
 277     private_stream_coded = 0;
 278     for(i=0;i<ctx->nb_streams;i++) {
 279         stream = ctx->streams[i]->priv_data;
 280         if (stream->id < 0xc0) {
 281             if (private_stream_coded)
 282                 continue;
 283             private_stream_coded = 1;
 284         }
 285         buf_index += 3;
 286     }
 287     return buf_index;
 288 }
 289
 290 static int mpeg_mux_init(AVFormatContext *ctx)
 291 {
 292     MpegMuxContext *s = ctx->priv_data;
 293     int bitrate, i, mpa_id, mpv_id, mps_id, ac3_id, dts_id, lpcm_id, j;
 294     AVStream *st;
 295     StreamInfo *stream;
 296     int audio_bitrate;
 297     int video_bitrate;
 298
 299     s->packet_number = 0;
 300     s->is_vcd =    (CONFIG_MPEG1VCD_MUXER  && ctx->oformat == &mpeg1vcd_muxer);
 301     s->is_svcd =   (CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &mpeg2svcd_muxer);
 302     s->is_mpeg2 = ((CONFIG_MPEG2VOB_MUXER  && ctx->oformat == &mpeg2vob_muxer) ||
 303                    (CONFIG_MPEG2DVD_MUXER  && ctx->oformat == &mpeg2dvd_muxer) ||
 304                    (CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &mpeg2svcd_muxer));
 305     s->is_dvd =    (CONFIG_MPEG2DVD_MUXER  && ctx->oformat == &mpeg2dvd_muxer);
 306
 307     if(ctx->packet_size)
 308         s->packet_size = ctx->packet_size;
 309     else
 310         s->packet_size = 2048;
 311
 312     s->vcd_padding_bytes_written = 0;
 313     s->vcd_padding_bitrate=0;
 314
 315     s->audio_bound = 0;
 316     s->video_bound = 0;
 317     mpa_id = AUDIO_ID;
 318     ac3_id = AC3_ID;
 319     dts_id = DTS_ID;
 320     mpv_id = VIDEO_ID;
 321     mps_id = SUB_ID;
 322     lpcm_id = LPCM_ID;
 323     for(i=0;i<ctx->nb_streams;i++) {
 324         st = ctx->streams[i];
 325         stream = av_mallocz(sizeof(StreamInfo));
 326         if (!stream)
 327             goto fail;
 328         st->priv_data = stream;
 329
 330         av_set_pts_info(st, 64, 1, 90000);
 331
 332         switch(st->codec->codec_type) {
 333         case CODEC_TYPE_AUDIO:
 334             if        (st->codec->codec_id == CODEC_ID_AC3) {
 335                 stream->id = ac3_id++;
 336             } else if (st->codec->codec_id == CODEC_ID_DTS) {
 337                 stream->id = dts_id++;
 338             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
 339                 stream->id = lpcm_id++;
 340                 for(j = 0; j < 4; j++) {
 341                     if (lpcm_freq_tab[j] == st->codec->sample_rate)
 342                         break;
 343                 }
 344                 if (j == 4)
 345                     goto fail;
 346                 if (st->codec->channels > 8)
 347                     return -1;
 348                 stream->lpcm_header[0] = 0x0c;
 349                 stream->lpcm_header[1] = (st->codec->channels - 1) | (j << 4);
 350                 stream->lpcm_header[2] = 0x80;
 351                 stream->lpcm_align = st->codec->channels * 2;
 352             } else {
 353                 stream->id = mpa_id++;
 354             }
 355
 356             /* This value HAS to be used for VCD (see VCD standard, p. IV-7).
 357                Right now it is also used for everything else.*/
 358             stream->max_buffer_size = 4 * 1024;
 359             s->audio_bound++;
 360             break;
 361         case CODEC_TYPE_VIDEO:
 362             stream->id = mpv_id++;
 363             if (st->codec->rc_buffer_size)
 364                 stream->max_buffer_size = 6*1024 + st->codec->rc_buffer_size/8;
 365             else
 366                 stream->max_buffer_size = 230*1024; //FIXME this is probably too small as default
 367 #if 0
 368                 /* see VCD standard, p. IV-7*/
 369                 stream->max_buffer_size = 46 * 1024;
 370             else
 371                 /* This value HAS to be used for SVCD (see SVCD standard, p. 26 V.2.3.2).
 372                    Right now it is also used for everything else.*/
 373                 stream->max_buffer_size = 230 * 1024;
 374 #endif
 375             s->video_bound++;
 376             break;
 377         case CODEC_TYPE_SUBTITLE:
 378             stream->id = mps_id++;
 379             stream->max_buffer_size = 16 * 1024;
 380             break;
 381         default:
 382             return -1;
 383         }
 384         stream->fifo= av_fifo_alloc(16);
 385     }
 386     bitrate = 0;
 387     audio_bitrate = 0;
 388     video_bitrate = 0;
 389     for(i=0;i<ctx->nb_streams;i++) {
 390         int codec_rate;
 391         st = ctx->streams[i];
 392         stream = (StreamInfo*) st->priv_data;
 393
 394         if(st->codec->rc_max_rate || stream->id==VIDEO_ID)
 395             codec_rate= st->codec->rc_max_rate;
 396         else
 397             codec_rate= st->codec->bit_rate;
 398
 399         if(!codec_rate)
 400             codec_rate= (1<<21)*8*50/ctx->nb_streams;
 401
 402         bitrate += codec_rate;
 403
 404         if (stream->id==AUDIO_ID)
 405             audio_bitrate += codec_rate;
 406         else if (stream->id==VIDEO_ID)
 407             video_bitrate += codec_rate;
 408     }
 409
 410     if(ctx->mux_rate){
 411         s->mux_rate= (ctx->mux_rate + (8 * 50) - 1) / (8 * 50);
 412     } else {
 413         /* we increase slightly the bitrate to take into account the
 414            headers. XXX: compute it exactly */
 415         bitrate += bitrate*5/100;
 416         bitrate += 10000;
 417         s->mux_rate = (bitrate + (8 * 50) - 1) / (8 * 50);
 418     }
 419
 420     if (s->is_vcd) {
 421         double overhead_rate;
 422
 423         /* The VCD standard mandates that the mux_rate field is 3528
 424            (see standard p. IV-6).
 425            The value is actually "wrong", i.e. if you calculate
 426            it using the normal formula and the 75 sectors per second transfer
 427            rate you get a different value because the real pack size is 2324,
 428            not 2352. But the standard explicitly specifies that the mux_rate
 429            field in the header must have this value.*/
 430 //        s->mux_rate=2352 * 75 / 50;    /* = 3528*/
 431
 432         /* The VCD standard states that the muxed stream must be
 433            exactly 75 packs / second (the data rate of a single speed cdrom).
 434            Since the video bitrate (probably 1150000 bits/sec) will be below
 435            the theoretical maximum we have to add some padding packets
 436            to make up for the lower data rate.
 437            (cf. VCD standard p. IV-6 )*/
 438
 439         /* Add the header overhead to the data rate.
 440            2279 data bytes per audio pack, 2294 data bytes per video pack*/
 441         overhead_rate  = ((audio_bitrate / 8.0) / 2279) * (2324 - 2279);
 442         overhead_rate += ((video_bitrate / 8.0) / 2294) * (2324 - 2294);
 443         overhead_rate *= 8;
 444
 445         /* Add padding so that the full bitrate is 2324*75 bytes/sec */
 446         s->vcd_padding_bitrate = 2324 * 75 * 8 - (bitrate + overhead_rate);
 447     }
 448
 449     if (s->is_vcd || s->is_mpeg2)
 450         /* every packet */
 451         s->pack_header_freq = 1;
 452     else
 453         /* every 2 seconds */
 454         s->pack_header_freq = 2 * bitrate / s->packet_size / 8;
 455
 456     /* the above seems to make pack_header_freq zero sometimes */
 457     if (s->pack_header_freq == 0)
 458        s->pack_header_freq = 1;
 459
 460     if (s->is_mpeg2)
 461         /* every 200 packets. Need to look at the spec.  */
 462         s->system_header_freq = s->pack_header_freq * 40;
 463     else if (s->is_vcd)
 464         /* the standard mandates that there are only two system headers
 465            in the whole file: one in the first packet of each stream.
 466            (see standard p. IV-7 and IV-8) */
 467         s->system_header_freq = 0x7fffffff;
 468     else
 469         s->system_header_freq = s->pack_header_freq * 5;
 470
 471     for(i=0;i<ctx->nb_streams;i++) {
 472         stream = ctx->streams[i]->priv_data;
 473         stream->packet_number = 0;
 474     }
 475     s->system_header_size = get_system_header_size(ctx);
 476     s->last_scr = 0;
 477     return 0;
 478  fail:
 479     for(i=0;i<ctx->nb_streams;i++) {
 480         av_free(ctx->streams[i]->priv_data);
 481     }
 482     return AVERROR(ENOMEM);
 483 }
 484
 485 static inline void put_timestamp(ByteIOContext *pb, int id, int64_t timestamp)
 486 {
 487     put_byte(pb,
 488              (id << 4) |
 489              (((timestamp >> 30) & 0x07) << 1) |
 490              1);
 491     put_be16(pb, (uint16_t)((((timestamp >> 15) & 0x7fff) << 1) | 1));
 492     put_be16(pb, (uint16_t)((((timestamp      ) & 0x7fff) << 1) | 1));
 493 }
 494
 495
 496 /* return the number of padding bytes that should be inserted into
 497    the multiplexed stream.*/
 498 static int get_vcd_padding_size(AVFormatContext *ctx, int64_t pts)
 499 {
 500     MpegMuxContext *s = ctx->priv_data;
 501     int pad_bytes = 0;
 502
 503     if (s->vcd_padding_bitrate > 0 && pts!=AV_NOPTS_VALUE)
 504     {
 505         int64_t full_pad_bytes;
 506
 507         full_pad_bytes = (int64_t)((s->vcd_padding_bitrate * (pts / 90000.0)) / 8.0); //FIXME this is wrong
 508         pad_bytes = (int) (full_pad_bytes - s->vcd_padding_bytes_written);
 509
 510         if (pad_bytes<0)
 511             /* might happen if we have already padded to a later timestamp. This
 512                can occur if another stream has already advanced further.*/
 513             pad_bytes=0;
 514     }
 515
 516     return pad_bytes;
 517 }
 518
 519
 520 #if 0 /* unused, remove? */
 521 /* return the exact available payload size for the next packet for
 522    stream 'stream_index'. 'pts' and 'dts' are only used to know if
 523    timestamps are needed in the packet header. */
 524 static int get_packet_payload_size(AVFormatContext *ctx, int stream_index,
 525                                    int64_t pts, int64_t dts)
 526 {
 527     MpegMuxContext *s = ctx->priv_data;
 528     int buf_index;
 529     StreamInfo *stream;
 530
 531     stream = ctx->streams[stream_index]->priv_data;
 532
 533     buf_index = 0;
 534     if (((s->packet_number % s->pack_header_freq) == 0)) {
 535         /* pack header size */
 536         if (s->is_mpeg2)
 537             buf_index += 14;
 538         else
 539             buf_index += 12;
 540
 541         if (s->is_vcd) {
 542             /* there is exactly one system header for each stream in a VCD MPEG,
 543                One in the very first video packet and one in the very first
 544                audio packet (see VCD standard p. IV-7 and IV-8).*/
 545
 546             if (stream->packet_number==0)
 547                 /* The system headers refer only to the stream they occur in,
 548                    so they have a constant size.*/
 549                 buf_index += 15;
 550
 551         } else {
 552             if ((s->packet_number % s->system_header_freq) == 0)
 553                 buf_index += s->system_header_size;
 554         }
 555     }
 556
 557     if ((s->is_vcd && stream->packet_number==0)
 558         || (s->is_svcd && s->packet_number==0))
 559         /* the first pack of each stream contains only the pack header,
 560            the system header and some padding (see VCD standard p. IV-6)
 561            Add the padding size, so that the actual payload becomes 0.*/
 562         buf_index += s->packet_size - buf_index;
 563     else {
 564         /* packet header size */
 565         buf_index += 6;
 566         if (s->is_mpeg2) {
 567             buf_index += 3;
 568             if (stream->packet_number==0)
 569                 buf_index += 3; /* PES extension */
 570             buf_index += 1;    /* obligatory stuffing byte */
 571         }
 572         if (pts != AV_NOPTS_VALUE) {
 573             if (dts != pts)
 574                 buf_index += 5 + 5;
 575             else
 576                 buf_index += 5;
 577
 578         } else {
 579             if (!s->is_mpeg2)
 580                 buf_index++;
 581         }
 582
 583         if (stream->id < 0xc0) {
 584             /* AC-3/LPCM private data header */
 585             buf_index += 4;
 586             if (stream->id >= 0xa0) {
 587                 int n;
 588                 buf_index += 3;
 589                 /* NOTE: we round the payload size to an integer number of
 590                    LPCM samples */
 591                 n = (s->packet_size - buf_index) % stream->lpcm_align;
 592                 if (n)
 593                     buf_index += (stream->lpcm_align - n);
 594             }
 595         }
 596
 597         if (s->is_vcd && stream->id == AUDIO_ID)
 598             /* The VCD standard demands that 20 zero bytes follow
 599                each audio packet (see standard p. IV-8).*/
 600             buf_index+=20;
 601     }
 602     return s->packet_size - buf_index;
 603 }
 604 #endif
 605
 606 /* Write an MPEG padding packet header. */
 607 static void put_padding_packet(AVFormatContext *ctx, ByteIOContext *pb,int packet_bytes)
 608 {
 609     MpegMuxContext *s = ctx->priv_data;
 610     int i;
 611
 612     put_be32(pb, PADDING_STREAM);
 613     put_be16(pb, packet_bytes - 6);
 614     if (!s->is_mpeg2) {
 615         put_byte(pb, 0x0f);
 616         packet_bytes -= 7;
 617     } else
 618         packet_bytes -= 6;
 619
 620     for(i=0;i<packet_bytes;i++)
 621         put_byte(pb, 0xff);
 622 }
 623
 624 static int get_nb_frames(AVFormatContext *ctx, StreamInfo *stream, int len){
 625     int nb_frames=0;
 626     PacketDesc *pkt_desc= stream->premux_packet;
 627
 628     while(len>0){
 629         if(pkt_desc->size == pkt_desc->unwritten_size)
 630             nb_frames++;
 631         len -= pkt_desc->unwritten_size;
 632         pkt_desc= pkt_desc->next;
 633     }
 634
 635     return nb_frames;
 636 }
 637
 638 /* flush the packet on stream stream_index */
 639 static int flush_packet(AVFormatContext *ctx, int stream_index,
 640                          int64_t pts, int64_t dts, int64_t scr, int trailer_size)
 641 {
 642     MpegMuxContext *s = ctx->priv_data;
 643     StreamInfo *stream = ctx->streams[stream_index]->priv_data;
 644     uint8_t *buf_ptr;
 645     int size, payload_size, startcode, id, stuffing_size, i, header_len;
 646     int packet_size;
 647     uint8_t buffer[128];
 648     int zero_trail_bytes = 0;
 649     int pad_packet_bytes = 0;
 650     int pes_flags;
 651     int general_pack = 0;  /*"general" pack without data specific to one stream?*/
 652     int nb_frames;
 653
 654     id = stream->id;
 655
 656 #if 0
 657     printf("packet ID=%2x PTS=%0.3f\n",
 658            id, pts / 90000.0);
 659 #endif
 660
 661     buf_ptr = buffer;
 662
 663     if ((s->packet_number % s->pack_header_freq) == 0 || s->last_scr != scr) {
 664         /* output pack and systems header if needed */
 665         size = put_pack_header(ctx, buf_ptr, scr);
 666         buf_ptr += size;
 667         s->last_scr= scr;
 668
 669         if (s->is_vcd) {
 670             /* there is exactly one system header for each stream in a VCD MPEG,
 671                One in the very first video packet and one in the very first
 672                audio packet (see VCD standard p. IV-7 and IV-8).*/
 673
 674             if (stream->packet_number==0) {
 675                 size = put_system_header(ctx, buf_ptr, id);
 676                 buf_ptr += size;
 677             }
 678         } else if (s->is_dvd) {
 679             if (stream->align_iframe || s->packet_number == 0){
 680                 int PES_bytes_to_fill = s->packet_size - size - 10;
 681
 682                 if (pts != AV_NOPTS_VALUE) {
 683                     if (dts != pts)
 684                         PES_bytes_to_fill -= 5 + 5;
 685                     else
 686                         PES_bytes_to_fill -= 5;
 687                 }
 688
 689                 if (stream->bytes_to_iframe == 0 || s->packet_number == 0) {
 690                     size = put_system_header(ctx, buf_ptr, 0);
 691                     buf_ptr += size;
 692                     size = buf_ptr - buffer;
 693                     put_buffer(ctx->pb, buffer, size);
 694
 695                     put_be32(ctx->pb, PRIVATE_STREAM_2);
 696                     put_be16(ctx->pb, 0x03d4);         // length
 697                     put_byte(ctx->pb, 0x00);           // substream ID, 00=PCI
 698                     for (i = 0; i < 979; i++)
 699                         put_byte(ctx->pb, 0x00);
 700
 701                     put_be32(ctx->pb, PRIVATE_STREAM_2);
 702                     put_be16(ctx->pb, 0x03fa);         // length
 703                     put_byte(ctx->pb, 0x01);           // substream ID, 01=DSI
 704                     for (i = 0; i < 1017; i++)
 705                         put_byte(ctx->pb, 0x00);
 706
 707                     memset(buffer, 0, 128);
 708                     buf_ptr = buffer;
 709                     s->packet_number++;
 710                     stream->align_iframe = 0;
 711                     scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
 712                     size = put_pack_header(ctx, buf_ptr, scr);
 713                     s->last_scr= scr;
 714                     buf_ptr += size;
 715                     /* GOP Start */
 716                 } else if (stream->bytes_to_iframe < PES_bytes_to_fill) {
 717                     pad_packet_bytes = PES_bytes_to_fill - stream->bytes_to_iframe;
 718                 }
 719             }
 720         } else {
 721             if ((s->packet_number % s->system_header_freq) == 0) {
 722                 size = put_system_header(ctx, buf_ptr, 0);
 723                 buf_ptr += size;
 724             }
 725         }
 726     }
 727     size = buf_ptr - buffer;
 728     put_buffer(ctx->pb, buffer, size);
 729
 730     packet_size = s->packet_size - size;
 731
 732     if (s->is_vcd && id == AUDIO_ID)
 733         /* The VCD standard demands that 20 zero bytes follow
 734            each audio pack (see standard p. IV-8).*/
 735         zero_trail_bytes += 20;
 736
 737     if ((s->is_vcd && stream->packet_number==0)
 738         || (s->is_svcd && s->packet_number==0)) {
 739         /* for VCD the first pack of each stream contains only the pack header,
 740            the system header and lots of padding (see VCD standard p. IV-6).
 741            In the case of an audio pack, 20 zero bytes are also added at
 742            the end.*/
 743         /* For SVCD we fill the very first pack to increase compatibility with
 744            some DVD players. Not mandated by the standard.*/
 745         if (s->is_svcd)
 746             general_pack = 1;    /* the system header refers to both streams and no stream data*/
 747         pad_packet_bytes = packet_size - zero_trail_bytes;
 748     }
 749
 750     packet_size -= pad_packet_bytes + zero_trail_bytes;
 751
 752     if (packet_size > 0) {
 753
 754         /* packet header size */
 755         packet_size -= 6;
 756
 757         /* packet header */
 758         if (s->is_mpeg2) {
 759             header_len = 3;
 760             if (stream->packet_number==0)
 761                 header_len += 3; /* PES extension */
 762             header_len += 1; /* obligatory stuffing byte */
 763         } else {
 764             header_len = 0;
 765         }
 766         if (pts != AV_NOPTS_VALUE) {
 767             if (dts != pts)
 768                 header_len += 5 + 5;
 769             else
 770                 header_len += 5;
 771         } else {
 772             if (!s->is_mpeg2)
 773                 header_len++;
 774         }
 775
 776         payload_size = packet_size - header_len;
 777         if (id < 0xc0) {
 778             startcode = PRIVATE_STREAM_1;
 779             payload_size -= 1;
 780             if (id >= 0x40) {
 781                 payload_size -= 3;
 782                 if (id >= 0xa0)
 783                     payload_size -= 3;
 784             }
 785         } else {
 786             startcode = 0x100 + id;
 787         }
 788
 789         stuffing_size = payload_size - av_fifo_size(stream->fifo);
 790
 791         // first byte does not fit -> reset pts/dts + stuffing
 792         if(payload_size <= trailer_size && pts != AV_NOPTS_VALUE){
 793             int timestamp_len=0;
 794             if(dts != pts)
 795                 timestamp_len += 5;
 796             if(pts != AV_NOPTS_VALUE)
 797                 timestamp_len += s->is_mpeg2 ? 5 : 4;
 798             pts=dts= AV_NOPTS_VALUE;
 799             header_len -= timestamp_len;
 800             if (s->is_dvd && stream->align_iframe) {
 801                 pad_packet_bytes += timestamp_len;
 802                 packet_size  -= timestamp_len;
 803             } else {
 804                 payload_size += timestamp_len;
 805             }
 806             stuffing_size += timestamp_len;
 807             if(payload_size > trailer_size)
 808                 stuffing_size += payload_size - trailer_size;
 809         }
 810
 811         if (pad_packet_bytes > 0 && pad_packet_bytes <= 7) { // can't use padding, so use stuffing
 812             packet_size += pad_packet_bytes;
 813             payload_size += pad_packet_bytes; // undo the previous adjustment
 814             if (stuffing_size < 0) {
 815                 stuffing_size  = pad_packet_bytes;
 816             } else {
 817                 stuffing_size += pad_packet_bytes;
 818             }
 819             pad_packet_bytes = 0;
 820         }
 821
 822         if (stuffing_size < 0)
 823             stuffing_size = 0;
 824         if (stuffing_size > 16) {    /*<=16 for MPEG-1, <=32 for MPEG-2*/
 825             pad_packet_bytes += stuffing_size;
 826             packet_size      -= stuffing_size;
 827             payload_size     -= stuffing_size;
 828             stuffing_size = 0;
 829         }
 830
 831         nb_frames= get_nb_frames(ctx, stream, payload_size - stuffing_size);
 832
 833         put_be32(ctx->pb, startcode);
 834
 835         put_be16(ctx->pb, packet_size);
 836
 837         if (!s->is_mpeg2)
 838             for(i=0;i<stuffing_size;i++)
 839                 put_byte(ctx->pb, 0xff);
 840
 841         if (s->is_mpeg2) {
 842             put_byte(ctx->pb, 0x80); /* mpeg2 id */
 843
 844             pes_flags=0;
 845
 846             if (pts != AV_NOPTS_VALUE) {
 847                 pes_flags |= 0x80;
 848                 if (dts != pts)
 849                     pes_flags |= 0x40;
 850             }
 851
 852             /* Both the MPEG-2 and the SVCD standards demand that the
 853                P-STD_buffer_size field be included in the first packet of
 854                every stream. (see SVCD standard p. 26 V.2.3.1 and V.2.3.2
 855                and MPEG-2 standard 2.7.7) */
 856             if (stream->packet_number == 0)
 857                 pes_flags |= 0x01;
 858
 859             put_byte(ctx->pb, pes_flags); /* flags */
 860             put_byte(ctx->pb, header_len - 3 + stuffing_size);
 861
 862             if (pes_flags & 0x80)  /*write pts*/
 863                 put_timestamp(ctx->pb, (pes_flags & 0x40) ? 0x03 : 0x02, pts);
 864             if (pes_flags & 0x40)  /*write dts*/
 865                 put_timestamp(ctx->pb, 0x01, dts);
 866
 867             if (pes_flags & 0x01) {  /*write pes extension*/
 868                 put_byte(ctx->pb, 0x10); /* flags */
 869
 870                 /* P-STD buffer info */
 871                 if (id == AUDIO_ID)
 872                     put_be16(ctx->pb, 0x4000 | stream->max_buffer_size/ 128);
 873                 else
 874                     put_be16(ctx->pb, 0x6000 | stream->max_buffer_size/1024);
 875             }
 876
 877         } else {
 878             if (pts != AV_NOPTS_VALUE) {
 879                 if (dts != pts) {
 880                     put_timestamp(ctx->pb, 0x03, pts);
 881                     put_timestamp(ctx->pb, 0x01, dts);
 882                 } else {
 883                     put_timestamp(ctx->pb, 0x02, pts);
 884                 }
 885             } else {
 886                 put_byte(ctx->pb, 0x0f);
 887             }
 888         }
 889
 890         if (s->is_mpeg2) {
 891             /* special stuffing byte that is always written
 892                to prevent accidental generation of start codes. */
 893             put_byte(ctx->pb, 0xff);
 894
 895             for(i=0;i<stuffing_size;i++)
 896                 put_byte(ctx->pb, 0xff);
 897         }
 898
 899         if (startcode == PRIVATE_STREAM_1) {
 900             put_byte(ctx->pb, id);
 901             if (id >= 0xa0) {
 902                 /* LPCM (XXX: check nb_frames) */
 903                 put_byte(ctx->pb, 7);
 904                 put_be16(ctx->pb, 4); /* skip 3 header bytes */
 905                 put_byte(ctx->pb, stream->lpcm_header[0]);
 906                 put_byte(ctx->pb, stream->lpcm_header[1]);
 907                 put_byte(ctx->pb, stream->lpcm_header[2]);
 908             } else if (id >= 0x40) {
 909                 /* AC-3 */
 910                 put_byte(ctx->pb, nb_frames);
 911                 put_be16(ctx->pb, trailer_size+1);
 912             }
 913         }
 914
 915         /* output data */
 916         assert(payload_size - stuffing_size <= av_fifo_size(stream->fifo));
 917         av_fifo_generic_read(stream->fifo, ctx->pb, payload_size - stuffing_size, &put_buffer);
 918         stream->bytes_to_iframe -= payload_size - stuffing_size;
 919     }else{
 920         payload_size=
 921         stuffing_size= 0;
 922     }
 923
 924     if (pad_packet_bytes > 0)
 925         put_padding_packet(ctx,ctx->pb, pad_packet_bytes);
 926
 927     for(i=0;i<zero_trail_bytes;i++)
 928         put_byte(ctx->pb, 0x00);
 929
 930     put_flush_packet(ctx->pb);
 931
 932     s->packet_number++;
 933
 934     /* only increase the stream packet number if this pack actually contains
 935        something that is specific to this stream! I.e. a dedicated header
 936        or some data.*/
 937     if (!general_pack)
 938         stream->packet_number++;
 939
 940     return payload_size - stuffing_size;
 941 }
 942
 943 static void put_vcd_padding_sector(AVFormatContext *ctx)
 944 {
 945     /* There are two ways to do this padding: writing a sector/pack
 946        of 0 values, or writing an MPEG padding pack. Both seem to
 947        work with most decoders, BUT the VCD standard only allows a 0-sector
 948        (see standard p. IV-4, IV-5).
 949        So a 0-sector it is...*/
 950
 951     MpegMuxContext *s = ctx->priv_data;
 952     int i;
 953
 954     for(i=0;i<s->packet_size;i++)
 955         put_byte(ctx->pb, 0);
 956
 957     s->vcd_padding_bytes_written += s->packet_size;
 958
 959     put_flush_packet(ctx->pb);
 960
 961     /* increasing the packet number is correct. The SCR of the following packs
 962        is calculated from the packet_number and it has to include the padding
 963        sector (it represents the sector index, not the MPEG pack index)
 964        (see VCD standard p. IV-6)*/
 965     s->packet_number++;
 966 }
 967
 968 #if 0 /* unused, remove? */
 969 static int64_t get_vcd_scr(AVFormatContext *ctx,int stream_index,int64_t pts)
 970 {
 971     MpegMuxContext *s = ctx->priv_data;
 972     int64_t scr;
 973
 974         /* Since the data delivery rate is constant, SCR is computed
 975            using the formula C + i * 1200 where C is the start constant
 976            and i is the pack index.
 977            It is recommended that SCR 0 is at the beginning of the VCD front
 978            margin (a sequence of empty Form 2 sectors on the CD).
 979            It is recommended that the front margin is 30 sectors long, so
 980            we use C = 30*1200 = 36000
 981            (Note that even if the front margin is not 30 sectors the file
 982            will still be correct according to the standard. It just won't have
 983            the "recommended" value).*/
 984         scr = 36000 + s->packet_number * 1200;
 985
 986     return scr;
 987 }
 988 #endif
 989
 990 static int remove_decoded_packets(AVFormatContext *ctx, int64_t scr){
 991 //    MpegMuxContext *s = ctx->priv_data;
 992     int i;
 993
 994     for(i=0; i<ctx->nb_streams; i++){
 995         AVStream *st = ctx->streams[i];
 996         StreamInfo *stream = st->priv_data;
 997         PacketDesc *pkt_desc;
 998
 999         while((pkt_desc= stream->predecode_packet)
1000               && scr > pkt_desc->dts){ //FIXME > vs >=
1001             if(stream->buffer_index < pkt_desc->size ||
1002                stream->predecode_packet == stream->premux_packet){
1003                 av_log(ctx, AV_LOG_ERROR,
1004                        "buffer underflow i=%d bufi=%d size=%d\n",
1005                        i, stream->buffer_index, pkt_desc->size);
1006                 break;
1007             }
1008             stream->buffer_index -= pkt_desc->size;
1009
1010             stream->predecode_packet= pkt_desc->next;
1011             av_freep(&pkt_desc);
1012         }
1013     }
1014
1015     return 0;
1016 }
1017
1018 static int output_packet(AVFormatContext *ctx, int flush){
1019     MpegMuxContext *s = ctx->priv_data;
1020     AVStream *st;
1021     StreamInfo *stream;
1022     int i, avail_space=0, es_size, trailer_size;
1023     int best_i= -1;
1024     int best_score= INT_MIN;
1025     int ignore_constraints=0;
1026     int64_t scr= s->last_scr;
1027     PacketDesc *timestamp_packet;
1028     const int64_t max_delay= av_rescale(ctx->max_delay, 90000, AV_TIME_BASE);
1029
1030 retry:
1031     for(i=0; i<ctx->nb_streams; i++){
1032         AVStream *st = ctx->streams[i];
1033         StreamInfo *stream = st->priv_data;
1034         const int avail_data=  av_fifo_size(stream->fifo);
1035         const int space= stream->max_buffer_size - stream->buffer_index;
1036         int rel_space= 1024*space / stream->max_buffer_size;
1037         PacketDesc *next_pkt= stream->premux_packet;
1038
1039         /* for subtitle, a single PES packet must be generated,
1040            so we flush after every single subtitle packet */
1041         if(s->packet_size > avail_data && !flush
1042            && st->codec->codec_type != CODEC_TYPE_SUBTITLE)
1043             return 0;
1044         if(avail_data==0)
1045             continue;
1046         assert(avail_data>0);
1047
1048         if(space < s->packet_size && !ignore_constraints)
1049             continue;
1050
1051         if(next_pkt && next_pkt->dts - scr > max_delay)
1052             continue;
1053
1054         if(rel_space > best_score){
1055             best_score= rel_space;
1056             best_i = i;
1057             avail_space= space;
1058         }
1059     }
1060
1061     if(best_i < 0){
1062         int64_t best_dts= INT64_MAX;
1063
1064         for(i=0; i<ctx->nb_streams; i++){
1065             AVStream *st = ctx->streams[i];
1066             StreamInfo *stream = st->priv_data;
1067             PacketDesc *pkt_desc= stream->predecode_packet;
1068             if(pkt_desc && pkt_desc->dts < best_dts)
1069                 best_dts= pkt_desc->dts;
1070         }
1071
1072 #if 0
1073         av_log(ctx, AV_LOG_DEBUG, "bumping scr, scr:%f, dts:%f\n",
1074                scr/90000.0, best_dts/90000.0);
1075 #endif
1076         if(best_dts == INT64_MAX)
1077             return 0;
1078
1079         if(scr >= best_dts+1 && !ignore_constraints){
1080             av_log(ctx, AV_LOG_ERROR, "packet too large, ignoring buffer limits to mux it\n");
1081             ignore_constraints= 1;
1082         }
1083         scr= FFMAX(best_dts+1, scr);
1084         if(remove_decoded_packets(ctx, scr) < 0)
1085             return -1;
1086         goto retry;
1087     }
1088
1089     assert(best_i >= 0);
1090
1091     st = ctx->streams[best_i];
1092     stream = st->priv_data;
1093
1094     assert(av_fifo_size(stream->fifo) > 0);
1095
1096     assert(avail_space >= s->packet_size || ignore_constraints);
1097
1098     timestamp_packet= stream->premux_packet;
1099     if(timestamp_packet->unwritten_size == timestamp_packet->size){
1100         trailer_size= 0;
1101     }else{
1102         trailer_size= timestamp_packet->unwritten_size;
1103         timestamp_packet= timestamp_packet->next;
1104     }
1105
1106     if(timestamp_packet){
1107 //av_log(ctx, AV_LOG_DEBUG, "dts:%f pts:%f scr:%f stream:%d\n", timestamp_packet->dts/90000.0, timestamp_packet->pts/90000.0, scr/90000.0, best_i);
1108         es_size= flush_packet(ctx, best_i, timestamp_packet->pts, timestamp_packet->dts, scr, trailer_size);
1109     }else{
1110         assert(av_fifo_size(stream->fifo) == trailer_size);
1111         es_size= flush_packet(ctx, best_i, AV_NOPTS_VALUE, AV_NOPTS_VALUE, scr, trailer_size);
1112     }
1113
1114     if (s->is_vcd) {
1115         /* Write one or more padding sectors, if necessary, to reach
1116            the constant overall bitrate.*/
1117         int vcd_pad_bytes;
1118
1119         while((vcd_pad_bytes = get_vcd_padding_size(ctx,stream->premux_packet->pts) ) >= s->packet_size){ //FIXME pts cannot be correct here
1120             put_vcd_padding_sector(ctx);
1121             s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
1122         }
1123     }
1124
1125     stream->buffer_index += es_size;
1126     s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
1127
1128     while(stream->premux_packet && stream->premux_packet->unwritten_size <= es_size){
1129         es_size -= stream->premux_packet->unwritten_size;
1130         stream->premux_packet= stream->premux_packet->next;
1131     }
1132     if(es_size)
1133         stream->premux_packet->unwritten_size -= es_size;
1134
1135     if(remove_decoded_packets(ctx, s->last_scr) < 0)
1136         return -1;
1137
1138     return 1;
1139 }
1140
1141 static int mpeg_mux_write_packet(AVFormatContext *ctx, AVPacket *pkt)
1142 {
1143     MpegMuxContext *s = ctx->priv_data;
1144     int stream_index= pkt->stream_index;
1145     int size= pkt->size;
1146     uint8_t *buf= pkt->data;
1147     AVStream *st = ctx->streams[stream_index];
1148     StreamInfo *stream = st->priv_data;
1149     int64_t pts, dts;
1150     PacketDesc *pkt_desc;
1151     const int preload= av_rescale(ctx->preload, 90000, AV_TIME_BASE);
1152     const int is_iframe = st->codec->codec_type == CODEC_TYPE_VIDEO && (pkt->flags & PKT_FLAG_KEY);
1153
1154     pts= pkt->pts;
1155     dts= pkt->dts;
1156
1157     if(pts != AV_NOPTS_VALUE) pts += preload;
1158     if(dts != AV_NOPTS_VALUE) dts += preload;
1159
1160 //av_log(ctx, AV_LOG_DEBUG, "dts:%f pts:%f flags:%d stream:%d nopts:%d\n", dts/90000.0, pts/90000.0, pkt->flags, pkt->stream_index, pts != AV_NOPTS_VALUE);
1161     if (!stream->premux_packet)
1162         stream->next_packet = &stream->premux_packet;
1163     *stream->next_packet=
1164     pkt_desc= av_mallocz(sizeof(PacketDesc));
1165     pkt_desc->pts= pts;
1166     pkt_desc->dts= dts;
1167     pkt_desc->unwritten_size=
1168     pkt_desc->size= size;
1169     if(!stream->predecode_packet)
1170         stream->predecode_packet= pkt_desc;
1171     stream->next_packet= &pkt_desc->next;
1172
1173     if (av_fifo_realloc2(stream->fifo, av_fifo_size(stream->fifo) + size) < 0)
1174         return -1;
1175
1176     if (s->is_dvd){
1177         if (is_iframe && (s->packet_number == 0 || (pts - stream->vobu_start_pts >= 36000))) { // min VOBU length 0.4 seconds (mpucoder)
1178             stream->bytes_to_iframe = av_fifo_size(stream->fifo);
1179             stream->align_iframe = 1;
1180             stream->vobu_start_pts = pts;
1181         }
1182     }
1183
1184     av_fifo_generic_write(stream->fifo, buf, size, NULL);
1185
1186     for(;;){
1187         int ret= output_packet(ctx, 0);
1188         if(ret<=0)
1189             return ret;
1190     }
1191 }
1192
1193 static int mpeg_mux_end(AVFormatContext *ctx)
1194 {
1195 //    MpegMuxContext *s = ctx->priv_data;
1196     StreamInfo *stream;
1197     int i;
1198
1199     for(;;){
1200         int ret= output_packet(ctx, 1);
1201         if(ret<0)
1202             return ret;
1203         else if(ret==0)
1204             break;
1205     }
1206
1207     /* End header according to MPEG1 systems standard. We do not write
1208        it as it is usually not needed by decoders and because it
1209        complicates MPEG stream concatenation. */
1210     //put_be32(ctx->pb, ISO_11172_END_CODE);
1211     //put_flush_packet(ctx->pb);
1212
1213     for(i=0;i<ctx->nb_streams;i++) {
1214         stream = ctx->streams[i]->priv_data;
1215
1216         assert(av_fifo_size(stream->fifo) == 0);
1217         av_fifo_free(stream->fifo);
1218     }
1219     return 0;
1220 }
1221
1222 #if CONFIG_MPEG1SYSTEM_MUXER
1223 AVOutputFormat mpeg1system_muxer = {
1224     "mpeg",
1225     NULL_IF_CONFIG_SMALL("MPEG-1 System format"),
1226     "video/mpeg",
1227     "mpg,mpeg",
1228     sizeof(MpegMuxContext),
1229     CODEC_ID_MP2,
1230     CODEC_ID_MPEG1VIDEO,
1231     mpeg_mux_init,
1232     mpeg_mux_write_packet,
1233     mpeg_mux_end,
1234 };
1235 #endif
1236 #if CONFIG_MPEG1VCD_MUXER
1237 AVOutputFormat mpeg1vcd_muxer = {
1238     "vcd",
1239     NULL_IF_CONFIG_SMALL("MPEG-1 System format (VCD)"),
1240     "video/mpeg",
1241     NULL,
1242     sizeof(MpegMuxContext),
1243     CODEC_ID_MP2,
1244     CODEC_ID_MPEG1VIDEO,
1245     mpeg_mux_init,
1246     mpeg_mux_write_packet,
1247     mpeg_mux_end,
1248 };
1249 #endif
1250 #if CONFIG_MPEG2VOB_MUXER
1251 AVOutputFormat mpeg2vob_muxer = {
1252     "vob",
1253     NULL_IF_CONFIG_SMALL("MPEG-2 PS format (VOB)"),
1254     "video/mpeg",
1255     "vob",
1256     sizeof(MpegMuxContext),
1257     CODEC_ID_MP2,
1258     CODEC_ID_MPEG2VIDEO,
1259     mpeg_mux_init,
1260     mpeg_mux_write_packet,
1261     mpeg_mux_end,
1262 };
1263 #endif
1264
1265 /* Same as mpeg2vob_mux except that the pack size is 2324 */
1266 #if CONFIG_MPEG2SVCD_MUXER
1267 AVOutputFormat mpeg2svcd_muxer = {
1268     "svcd",
1269     NULL_IF_CONFIG_SMALL("MPEG-2 PS format (VOB)"),
1270     "video/mpeg",
1271     "vob",
1272     sizeof(MpegMuxContext),
1273     CODEC_ID_MP2,
1274     CODEC_ID_MPEG2VIDEO,
1275     mpeg_mux_init,
1276     mpeg_mux_write_packet,
1277     mpeg_mux_end,
1278 };
1279 #endif
1280
1281 /*  Same as mpeg2vob_mux except the 'is_dvd' flag is set to produce NAV pkts */
1282 #if CONFIG_MPEG2DVD_MUXER
1283 AVOutputFormat mpeg2dvd_muxer = {
1284     "dvd",
1285     NULL_IF_CONFIG_SMALL("MPEG-2 PS format (DVD VOB)"),
1286     "video/mpeg",
1287     "dvd",
1288     sizeof(MpegMuxContext),
1289     CODEC_ID_MP2,
1290     CODEC_ID_MPEG2VIDEO,
1291     mpeg_mux_init,
1292     mpeg_mux_write_packet,
1293     mpeg_mux_end,
1294 };
1295 #endif