libavformat/gxfenc.c

   1 /*
   2  * GXF muxer.
   3  * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>.
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (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
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "avformat.h"
  23 #include "gxf.h"
  24 #include "riff.h"
  25 #include "fifo.h"
  26
  27 #define GXF_AUDIO_PACKET_SIZE 65536
  28
  29 typedef struct GXFStreamContext {
  30     AVCodecContext *codec;
  31     AVFifoBuffer audio_buffer;
  32     uint32_t track_type;
  33     uint32_t sample_size;
  34     uint32_t sample_rate;
  35     uint16_t media_type;
  36     uint16_t media_info;
  37     uint8_t index;
  38     int frame_rate_index;
  39     int lines_index;
  40     int fields;
  41     int iframes;
  42     int pframes;
  43     int bframes;
  44     int p_per_gop;
  45     int b_per_gop;
  46     int first_gop_closed;
  47     int64_t current_dts;
  48     int dts_delay;
  49 } GXFStreamContext;
  50
  51 typedef struct GXFContext {
  52     uint32_t nb_frames;
  53     uint32_t material_flags;
  54     uint16_t audio_tracks;
  55     uint16_t mpeg_tracks;
  56     int64_t creation_time;
  57     uint32_t umf_start_offset;
  58     uint32_t umf_track_offset;
  59     uint32_t umf_media_offset;
  60     uint32_t umf_user_data_offset;
  61     uint32_t umf_user_data_size;
  62     uint32_t umf_length;
  63     uint16_t umf_track_size;
  64     uint16_t umf_media_size;
  65     int audio_written;
  66     int sample_rate;
  67     int flags;
  68     AVFormatContext *fc;
  69     GXFStreamContext streams[48];
  70 } GXFContext;
  71
  72 typedef struct GXF_Lines {
  73     int height;
  74     int index;
  75 } GXF_Lines;
  76
  77
  78 /* FIXME check if it is relevant */
  79 static const GXF_Lines gxf_lines_tab[] = {
  80     { 480,  1 }, /* NTSC */
  81     { 512,  1 }, /* NTSC + VBI */
  82     { 576,  2 }, /* PAL */
  83     { 608,  2 }, /* PAL + VBI */
  84     { 1080, 4 },
  85     { 720,  6 },
  86 };
  87
  88 static const CodecTag gxf_media_types[] = {
  89     { CODEC_ID_MJPEG     ,   3 }, /* NTSC */
  90     { CODEC_ID_MJPEG     ,   4 }, /* PAL */
  91     { CODEC_ID_PCM_S24LE ,   9 },
  92     { CODEC_ID_PCM_S16LE ,  10 },
  93     { CODEC_ID_MPEG2VIDEO,  11 }, /* NTSC */
  94     { CODEC_ID_MPEG2VIDEO,  12 }, /* PAL */
  95     { CODEC_ID_DVVIDEO   ,  13 }, /* NTSC */
  96     { CODEC_ID_DVVIDEO   ,  14 }, /* PAL */
  97     { CODEC_ID_DVVIDEO   ,  15 }, /* 50M NTSC */
  98     { CODEC_ID_DVVIDEO   ,  16 }, /* 50M PAL */
  99     { CODEC_ID_AC3       ,  17 },
 100     //{ CODEC_ID_NONE,  ,   18 }, /* Non compressed 24 bit audio */
 101     { CODEC_ID_MPEG2VIDEO,  20 }, /* MPEG HD */
 102     { CODEC_ID_MPEG1VIDEO,  22 }, /* NTSC */
 103     { CODEC_ID_MPEG1VIDEO,  23 }, /* PAL */
 104     { 0, 0 },
 105 };
 106
 107 #define SERVER_PATH "/space/"
 108 #define ES_NAME_PATTERN "ES."
 109
 110 static int gxf_find_lines_index(GXFStreamContext *ctx)
 111 {
 112     int i;
 113
 114     for (i = 0; i < 6; ++i) {
 115         if (ctx->codec->height == gxf_lines_tab[i].height) {
 116             ctx->lines_index = gxf_lines_tab[i].index;
 117             return 0;
 118         }
 119     }
 120     return -1;
 121 }
 122
 123 static void gxf_write_padding(ByteIOContext *pb, offset_t to_pad)
 124 {
 125     for (; to_pad > 0; to_pad--) {
 126         put_byte(pb, 0);
 127     }
 128 }
 129
 130 static offset_t updatePacketSize(ByteIOContext *pb, offset_t pos)
 131 {
 132     offset_t curpos;
 133     int size;
 134
 135     size = url_ftell(pb) - pos;
 136     if (size % 4) {
 137         gxf_write_padding(pb, 4 - size % 4);
 138         size = url_ftell(pb) - pos;
 139     }
 140     curpos = url_ftell(pb);
 141     url_fseek(pb, pos + 6, SEEK_SET);
 142     put_be32(pb, size);
 143     url_fseek(pb, curpos, SEEK_SET);
 144     return curpos - pos;
 145 }
 146
 147 static offset_t updateSize(ByteIOContext *pb, offset_t pos)
 148 {
 149     offset_t curpos;
 150
 151     curpos = url_ftell(pb);
 152     url_fseek(pb, pos, SEEK_SET);
 153     put_be16(pb, curpos - pos - 2);
 154     url_fseek(pb, curpos, SEEK_SET);
 155     return curpos - pos;
 156 }
 157
 158 static void gxf_write_packet_header(ByteIOContext *pb, pkt_type_t type)
 159 {
 160     put_be32(pb, 0); /* packet leader for synchro */
 161     put_byte(pb, 1);
 162     put_byte(pb, type); /* map packet */
 163     put_be32(pb, 0); /* size */
 164     put_be32(pb, 0); /* reserved */
 165     put_byte(pb, 0xE1); /* trailer 1 */
 166     put_byte(pb, 0xE2); /* trailer 2 */
 167 }
 168
 169 static int gxf_write_mpeg_auxiliary(ByteIOContext *pb, GXFStreamContext *ctx)
 170 {
 171     char buffer[1024];
 172     int size;
 173
 174     if (ctx->iframes) {
 175         ctx->p_per_gop = ctx->pframes / ctx->iframes;
 176         if (ctx->pframes % ctx->iframes)
 177             ctx->p_per_gop++;
 178         if (ctx->pframes)
 179             ctx->b_per_gop = ctx->bframes / ctx->pframes;
 180         if (ctx->p_per_gop > 9)
 181             ctx->p_per_gop = 9; /* ensure value won't take more than one char */
 182         if (ctx->b_per_gop > 9)
 183             ctx->b_per_gop = 9; /* ensure value won't take more than one char */
 184     }
 185     size = snprintf(buffer, 1024, "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n"
 186                     "Pix 0\nCf %d\nCg %d\nSl 7\nnl16 %d\nVi 1\nf1 1\n",
 187                     (float)ctx->codec->bit_rate, ctx->p_per_gop, ctx->b_per_gop,
 188                     ctx->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1, ctx->first_gop_closed == 1,
 189                     ctx->codec->height / 16);
 190     put_byte(pb, 0x4F);
 191     put_byte(pb, size + 1);
 192     put_buffer(pb, (uint8_t *)buffer, size + 1);
 193     return size + 3;
 194 }
 195
 196 static int gxf_write_timecode_auxiliary(ByteIOContext *pb, GXFStreamContext *ctx)
 197 {
 198     /* FIXME implement that */
 199     put_byte(pb, 0); /* fields */
 200     put_byte(pb, 0);  /* seconds */
 201     put_byte(pb, 0); /* minutes */
 202     put_byte(pb, 0); /* flags + hours */
 203     /* reserved */
 204     put_be32(pb, 0);
 205     return 8;
 206 }
 207
 208 static int gxf_write_track_description(ByteIOContext *pb, GXFStreamContext *stream)
 209 {
 210     offset_t pos;
 211
 212     /* track description section */
 213     put_byte(pb, stream->media_type + 0x80);
 214     put_byte(pb, stream->index + 0xC0);
 215
 216     pos = url_ftell(pb);
 217     put_be16(pb, 0); /* size */
 218
 219     /* media file name */
 220     put_byte(pb, 0x4C);
 221     put_byte(pb, strlen(ES_NAME_PATTERN) + 3);
 222     put_tag(pb, ES_NAME_PATTERN);
 223     put_be16(pb, stream->media_info);
 224     put_byte(pb, 0);
 225
 226     if (stream->codec->codec_id != CODEC_ID_MPEG2VIDEO) {
 227         /* auxiliary information */
 228         put_byte(pb, 0x4D);
 229         put_byte(pb, 8);
 230         if (stream->codec->codec_id == CODEC_ID_NONE)
 231             gxf_write_timecode_auxiliary(pb, stream);
 232         else
 233             put_le64(pb, 0);
 234     }
 235
 236     /* file system version */
 237     put_byte(pb, 0x4E);
 238     put_byte(pb, 4);
 239     put_be32(pb, 0);
 240
 241     if (stream->codec->codec_id == CODEC_ID_MPEG2VIDEO)
 242         gxf_write_mpeg_auxiliary(pb, stream);
 243
 244     /* frame rate */
 245     put_byte(pb, 0x50);
 246     put_byte(pb, 4);
 247     put_be32(pb, stream->frame_rate_index);
 248
 249     /* lines per frame */
 250     put_byte(pb, 0x51);
 251     put_byte(pb, 4);
 252     put_be32(pb, stream->lines_index);
 253
 254     /* fields per frame */
 255     put_byte(pb, 0x52);
 256     put_byte(pb, 4);
 257     put_be32(pb, stream->fields);
 258
 259     return updateSize(pb, pos);
 260 }
 261
 262 static int gxf_write_material_data_section(ByteIOContext *pb, GXFContext *ctx)
 263 {
 264     offset_t pos;
 265     const char *filename = strrchr(ctx->fc->filename, '/');
 266
 267     pos = url_ftell(pb);
 268     put_be16(pb, 0); /* size */
 269
 270     /* name */
 271     if (filename)
 272         filename++;
 273     else
 274         filename = ctx->fc->filename;
 275     put_byte(pb, 0x40);
 276     put_byte(pb, strlen(SERVER_PATH) + strlen(filename) + 1);
 277     put_tag(pb, SERVER_PATH);
 278     put_tag(pb, filename);
 279     put_byte(pb, 0);
 280
 281     /* first field */
 282     put_byte(pb, 0x41);
 283     put_byte(pb, 4);
 284     put_be32(pb, 0);
 285
 286     /* last field */
 287     put_byte(pb, 0x42);
 288     put_byte(pb, 4);
 289     put_be32(pb, ctx->nb_frames);
 290
 291     /* reserved */
 292     put_byte(pb, 0x43);
 293     put_byte(pb, 4);
 294     put_be32(pb, 0);
 295
 296     put_byte(pb, 0x44);
 297     put_byte(pb, 4);
 298     put_be32(pb, ctx->nb_frames);
 299
 300     /* estimated size */
 301     put_byte(pb, 0x45);
 302     put_byte(pb, 4);
 303     put_be32(pb, url_fsize(pb) / 1024);
 304
 305     return updateSize(pb, pos);
 306 }
 307
 308 static int gxf_write_track_description_section(ByteIOContext *pb, GXFContext *ctx)
 309 {
 310     offset_t pos;
 311     int i;
 312
 313     pos = url_ftell(pb);
 314     put_be16(pb, 0); /* size */
 315     for (i = 0; i < ctx->fc->nb_streams; ++i)
 316         gxf_write_track_description(pb, &ctx->streams[i]);
 317     return updateSize(pb, pos);
 318 }
 319
 320 static int gxf_write_map_packet(ByteIOContext *pb, GXFContext *ctx)
 321 {
 322     offset_t pos = url_ftell(pb);
 323
 324     gxf_write_packet_header(pb, PKT_MAP);
 325
 326     /* preamble */
 327     put_byte(pb, 0xE0); /* version */
 328     put_byte(pb, 0xFF); /* reserved */
 329
 330     gxf_write_material_data_section(pb, ctx);
 331     gxf_write_track_description_section(pb, ctx);
 332
 333     return updatePacketSize(pb, pos);
 334 }
 335
 336 #if 0
 337 static int gxf_write_flt_packet(ByteIOContext *pb, GXFContext *ctx)
 338 {
 339     offset_t pos = url_ftell(pb);
 340     int i;
 341
 342     gxf_write_packet_header(pb, PKT_FLT);
 343
 344     put_le32(pb, 1000); /* number of fields */
 345     put_le32(pb, 0); /* number of active flt entries */
 346
 347     for (i = 0; i < 1000; ++i) {
 348         put_le32(pb, 0);
 349     }
 350     return updatePacketSize(pb, pos);
 351 }
 352 #endif
 353
 354 static int gxf_write_umf_material_description(ByteIOContext *pb, GXFContext *ctx)
 355 {
 356     put_le32(pb, ctx->flags);
 357     put_le32(pb, ctx->nb_frames); /* length of the longest track */
 358     put_le32(pb, ctx->nb_frames); /* length of the shortest track */
 359     put_le32(pb, 0); /* mark in */
 360     put_le32(pb, ctx->nb_frames); /* mark out */
 361     put_le32(pb, 0); /* timecode mark in */
 362     put_le32(pb, ctx->nb_frames); /* timecode mark out */
 363     put_le64(pb, ctx->fc->timestamp); /* modification time */
 364     put_le64(pb, ctx->fc->timestamp); /* creation time */
 365     put_le16(pb, 0); /* reserved */
 366     put_le16(pb, 0); /* reserved */
 367     put_le16(pb, ctx->audio_tracks);
 368     put_le16(pb, 0); /* timecode track count */
 369     put_le16(pb, 0); /* reserved */
 370     put_le16(pb, ctx->mpeg_tracks);
 371     return 48;
 372 }
 373
 374 static int gxf_write_umf_payload(ByteIOContext *pb, GXFContext *ctx)
 375 {
 376     put_le32(pb, ctx->umf_length); /* total length of the umf data */
 377     put_le32(pb, 3); /* version */
 378     put_le32(pb, ctx->fc->nb_streams);
 379     put_le32(pb, ctx->umf_track_offset); /* umf track section offset */
 380     put_le32(pb, ctx->umf_track_size);
 381     put_le32(pb, ctx->fc->nb_streams);
 382     put_le32(pb, ctx->umf_media_offset);
 383     put_le32(pb, ctx->umf_media_size);
 384     put_le32(pb, ctx->umf_user_data_offset); /* user data offset */
 385     put_le32(pb, ctx->umf_user_data_size); /* user data size */
 386     put_le32(pb, 0); /* reserved */
 387     put_le32(pb, 0); /* reserved */
 388     return 48;
 389 }
 390
 391 static int gxf_write_umf_track_description(ByteIOContext *pb, GXFContext *ctx)
 392 {
 393     offset_t pos = url_ftell(pb);
 394     int tracks[255]={0};
 395     int i;
 396
 397     ctx->umf_track_offset = pos - ctx->umf_start_offset;
 398     for (i = 0; i < ctx->fc->nb_streams; ++i) {
 399         AVStream *st = ctx->fc->streams[i];
 400         GXFStreamContext *sc = &ctx->streams[i];
 401         int id = 0;
 402
 403         switch (st->codec->codec_id) {
 404         case CODEC_ID_MPEG1VIDEO: id= 'L'; break;
 405         case CODEC_ID_MPEG2VIDEO: id= 'M'; break;
 406         case CODEC_ID_PCM_S16LE:  id= 'A'; break;
 407         case CODEC_ID_DVVIDEO:    id= sc->track_type == 6 ? 'E' : 'D'; break;
 408         case CODEC_ID_MJPEG:      id= 'V'; break;
 409         default:                  break;
 410         }
 411         sc->media_info= id << 8;
 412         /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
 413         sc->media_info |= '0' + (tracks[id]++);
 414         put_le16(pb, sc->media_info);
 415         put_le16(pb, 1);
 416     }
 417     return url_ftell(pb) - pos;
 418 }
 419
 420 static int gxf_write_umf_media_mpeg(ByteIOContext *pb, GXFStreamContext *stream)
 421 {
 422     if (stream->codec->pix_fmt == PIX_FMT_YUV422P)
 423         put_le32(pb, 2);
 424     else
 425         put_le32(pb, 1); /* default to 420 */
 426     put_le32(pb, stream->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
 427     put_le32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
 428     put_le32(pb, 1); /* I picture per GOP */
 429     put_le32(pb, stream->p_per_gop);
 430     put_le32(pb, stream->b_per_gop);
 431     if (stream->codec->codec_id == CODEC_ID_MPEG2VIDEO)
 432         put_le32(pb, 2);
 433     else if (stream->codec->codec_id == CODEC_ID_MPEG1VIDEO)
 434         put_le32(pb, 1);
 435     else
 436         put_le32(pb, 0);
 437     put_le32(pb, 0); /* reserved */
 438     return 32;
 439 }
 440
 441 static int gxf_write_umf_media_timecode(ByteIOContext *pb, GXFStreamContext *track)
 442 {
 443     /* FIXME implement */
 444     put_be32(pb, 0); /* drop frame flag */
 445     put_be32(pb, 0); /* reserved */
 446     put_be32(pb, 0); /* reserved */
 447     put_be32(pb, 0); /* reserved */
 448     put_be32(pb, 0); /* reserved */
 449     put_be32(pb, 0); /* reserved */
 450     put_be32(pb, 0); /* reserved */
 451     put_be32(pb, 0); /* reserved */
 452     return 32;
 453 }
 454
 455 static int gxf_write_umf_media_dv(ByteIOContext *pb, GXFStreamContext *track)
 456 {
 457     int i;
 458
 459     for (i = 0; i < 8; i++) {
 460         put_be32(pb, 0);
 461     }
 462     return 32;
 463 }
 464
 465 static int gxf_write_umf_media_audio(ByteIOContext *pb, GXFStreamContext *track)
 466 {
 467     put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
 468     put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
 469     put_le32(pb, 0); /* number of fields over which to ramp up sound level */
 470     put_le32(pb, 0); /* number of fields over which to ramp down sound level */
 471     put_le32(pb, 0); /* reserved */
 472     put_le32(pb, 0); /* reserved */
 473     return 32;
 474 }
 475
 476 #if 0
 477 static int gxf_write_umf_media_mjpeg(ByteIOContext *pb, GXFStreamContext *track)
 478 {
 479     put_be64(pb, 0); /* FIXME FLOAT max chroma quant level */
 480     put_be64(pb, 0); /* FIXME FLOAT max luma quant level */
 481     put_be64(pb, 0); /* FIXME FLOAT min chroma quant level */
 482     put_be64(pb, 0); /* FIXME FLOAT min luma quant level */
 483     return 32;
 484 }
 485 #endif
 486
 487 static int gxf_write_umf_media_description(ByteIOContext *pb, GXFContext *ctx)
 488 {
 489     offset_t pos;
 490     int i;
 491
 492     pos = url_ftell(pb);
 493     ctx->umf_media_offset = pos - ctx->umf_start_offset;
 494     for (i = 0; i < ctx->fc->nb_streams; ++i) {
 495         GXFStreamContext *sc = &ctx->streams[i];
 496         char buffer[88];
 497         offset_t startpos, curpos;
 498         int path_size = strlen(ES_NAME_PATTERN);
 499
 500         memset(buffer, 0, 88);
 501         startpos = url_ftell(pb);
 502         put_le16(pb, 0); /* length */
 503         put_le16(pb, sc->media_info);
 504         put_le16(pb, 0); /* reserved */
 505         put_le16(pb, 0); /* reserved */
 506         put_le32(pb, ctx->nb_frames);
 507         put_le32(pb, 0); /* attributes rw, ro */
 508         put_le32(pb, 0); /* mark in */
 509         put_le32(pb, ctx->nb_frames); /* mark out */
 510         strncpy(buffer, ES_NAME_PATTERN, path_size);
 511         put_buffer(pb, (uint8_t *)buffer, path_size);
 512         put_be16(pb, sc->media_info);
 513         put_buffer(pb, (uint8_t *)buffer + path_size + 2, 88 - path_size - 2);
 514         put_le32(pb, sc->track_type);
 515         put_le32(pb, sc->sample_rate);
 516         put_le32(pb, sc->sample_size);
 517         put_le32(pb, 0); /* reserved */
 518         switch (sc->codec->codec_id) {
 519         case CODEC_ID_MPEG2VIDEO:
 520             gxf_write_umf_media_mpeg(pb, sc);
 521             break;
 522         case CODEC_ID_PCM_S16LE:
 523             gxf_write_umf_media_audio(pb, sc);
 524             break;
 525         case CODEC_ID_DVVIDEO:
 526             gxf_write_umf_media_dv(pb, sc);
 527             break;
 528         default:
 529             gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
 530         }
 531         curpos = url_ftell(pb);
 532         url_fseek(pb, startpos, SEEK_SET);
 533         put_le16(pb, curpos - startpos);
 534         url_fseek(pb, curpos, SEEK_SET);
 535     }
 536     return url_ftell(pb) - pos;
 537 }
 538
 539 static int gxf_write_umf_user_data(ByteIOContext *pb, GXFContext *ctx)
 540 {
 541     offset_t pos = url_ftell(pb);
 542     ctx->umf_user_data_offset = pos - ctx->umf_start_offset;
 543     put_le32(pb, 20);
 544     put_le32(pb,  0);
 545     put_le16(pb,  0);
 546     put_le16(pb,  0);
 547     put_le32(pb,  0);
 548     put_byte(pb,  0);
 549     put_byte(pb,  0);
 550     put_byte(pb,  0);
 551     put_byte(pb,  0);
 552     return 20;
 553 }
 554
 555 static int gxf_write_umf_packet(ByteIOContext *pb, GXFContext *ctx)
 556 {
 557     offset_t pos = url_ftell(pb);
 558
 559     gxf_write_packet_header(pb, PKT_UMF);
 560
 561     /* preamble */
 562     put_byte(pb, 3); /* first and last (only) packet */
 563     put_be32(pb, ctx->umf_length); /* data length */
 564
 565     ctx->umf_start_offset = url_ftell(pb);
 566     gxf_write_umf_payload(pb, ctx);
 567     gxf_write_umf_material_description(pb, ctx);
 568     ctx->umf_track_size = gxf_write_umf_track_description(pb, ctx);
 569     ctx->umf_media_size = gxf_write_umf_media_description(pb, ctx);
 570     ctx->umf_user_data_size = gxf_write_umf_user_data(pb, ctx);
 571     ctx->umf_length = url_ftell(pb) - ctx->umf_start_offset;
 572     return updatePacketSize(pb, pos);
 573 }
 574
 575 static int gxf_write_header(AVFormatContext *s)
 576 {
 577     ByteIOContext *pb = &s->pb;
 578     GXFContext *gxf = s->priv_data;
 579     int i;
 580
 581     gxf->fc = s;
 582     gxf->flags |= 0x00080000; /* material is simple clip */
 583     for (i = 0; i < s->nb_streams; ++i) {
 584         AVStream *st = s->streams[i];
 585         GXFStreamContext *sc = &gxf->streams[i];
 586
 587         sc->codec = st->codec;
 588         sc->index = i;
 589         sc->media_type = codec_get_tag(gxf_media_types, sc->codec->codec_id);
 590         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 591             if (st->codec->codec_id != CODEC_ID_PCM_S16LE) {
 592                 av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
 593                 return -1;
 594             }
 595             if (st->codec->sample_rate != 48000) {
 596                 av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
 597                 return -1;
 598             }
 599             if (st->codec->channels != 1) {
 600                 av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
 601                 return -1;
 602             }
 603             sc->track_type = 2;
 604             sc->sample_rate = st->codec->sample_rate;
 605             av_set_pts_info(st, 64, 1, sc->sample_rate);
 606             sc->sample_size = 16;
 607             sc->frame_rate_index = -2;
 608             sc->lines_index = -2;
 609             sc->fields = -2;
 610             gxf->audio_tracks++;
 611             gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
 612             av_fifo_init(&sc->audio_buffer, 3*GXF_AUDIO_PACKET_SIZE);
 613         } else if (sc->codec->codec_type == CODEC_TYPE_VIDEO) {
 614             /* FIXME check from time_base ? */
 615             if (sc->codec->height == 480 || sc->codec->height == 512) { /* NTSC or NTSC+VBI */
 616                 sc->frame_rate_index = 5;
 617                 sc->sample_rate = 60;
 618                 gxf->flags |= 0x00000080;
 619             } else { /* assume PAL */
 620                 sc->frame_rate_index = 6;
 621                 sc->media_type++;
 622                 sc->sample_rate = 50;
 623                 gxf->flags |= 0x00000040;
 624             }
 625             gxf->sample_rate = sc->sample_rate;
 626             av_set_pts_info(st, 64, 1, sc->sample_rate);
 627             if (gxf_find_lines_index(sc) < 0)
 628                 sc->lines_index = -1;
 629             sc->sample_size = st->codec->bit_rate;
 630             sc->fields = 2; /* interlaced */
 631             switch (sc->codec->codec_id) {
 632             case CODEC_ID_MPEG2VIDEO:
 633                 sc->first_gop_closed = -1;
 634                 sc->track_type = 4;
 635                 gxf->mpeg_tracks++;
 636                 gxf->flags |= 0x00008000;
 637                 break;
 638             case CODEC_ID_DVVIDEO:
 639                 if (sc->codec->pix_fmt == PIX_FMT_YUV422P) {
 640                     sc->media_type += 2;
 641                     sc->track_type = 6;
 642                     gxf->flags |= 0x00002000;
 643                 } else {
 644                     sc->track_type = 5;
 645                     gxf->flags |= 0x00001000;
 646                 }
 647                 break;
 648             default:
 649                 av_log(s, AV_LOG_ERROR, "video codec not supported\n");
 650                 return -1;
 651             }
 652         }
 653     }
 654     gxf_write_map_packet(pb, gxf);
 655     //gxf_write_flt_packet(pb, gxf);
 656     gxf_write_umf_packet(pb, gxf);
 657     put_flush_packet(pb);
 658     return 0;
 659 }
 660
 661 static int gxf_write_eos_packet(ByteIOContext *pb, GXFContext *ctx)
 662 {
 663     offset_t pos = url_ftell(pb);
 664
 665     gxf_write_packet_header(pb, PKT_EOS);
 666     return updatePacketSize(pb, pos);
 667 }
 668
 669 static int gxf_write_trailer(AVFormatContext *s)
 670 {
 671     ByteIOContext *pb = &s->pb;
 672     GXFContext *gxf = s->priv_data;
 673     offset_t end;
 674     int i;
 675
 676     for (i = 0; i < s->nb_streams; ++i) {
 677         if (s->streams[i]->codec->codec_type == CODEC_TYPE_AUDIO) {
 678             av_fifo_free(&gxf->streams[i].audio_buffer);
 679         }
 680         if (s->streams[i]->codec->frame_number > gxf->nb_frames)
 681             gxf->nb_frames = 2 * s->streams[i]->codec->frame_number;
 682     }
 683
 684     gxf_write_eos_packet(pb, gxf);
 685     end = url_ftell(pb);
 686     url_fseek(pb, 0, SEEK_SET);
 687     /* overwrite map and umf packets with new values */
 688     gxf_write_map_packet(pb, gxf);
 689     //gxf_write_flt_packet(pb, gxf);
 690     gxf_write_umf_packet(pb, gxf);
 691     url_fseek(pb, end, SEEK_SET);
 692     return 0;
 693 }
 694
 695 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
 696 {
 697     uint32_t c=-1;
 698     int i;
 699     for(i=0; i<size-4 && c!=0x100; i++){
 700         c = (c<<8) + buf[i];
 701         if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
 702             sc->first_gop_closed= (buf[i+4]>>6)&1;
 703     }
 704     return (buf[i+1]>>3)&7;
 705 }
 706
 707 static int gxf_write_media_preamble(ByteIOContext *pb, GXFContext *ctx, AVPacket *pkt, int size)
 708 {
 709     GXFStreamContext *sc = &ctx->streams[pkt->stream_index];
 710     int64_t dts = av_rescale(pkt->dts, ctx->sample_rate, sc->sample_rate);
 711
 712     put_byte(pb, sc->media_type);
 713     put_byte(pb, sc->index);
 714     put_be32(pb, dts);
 715     if (sc->codec->codec_type == CODEC_TYPE_AUDIO) {
 716         put_be16(pb, 0);
 717         put_be16(pb, size / 2);
 718     } else if (sc->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
 719         int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
 720         if (frame_type == FF_I_TYPE) {
 721             put_byte(pb, 0x0d);
 722             sc->iframes++;
 723         } else if (frame_type == FF_B_TYPE) {
 724             put_byte(pb, 0x0f);
 725             sc->bframes++;
 726         } else {
 727             put_byte(pb, 0x0e);
 728             sc->pframes++;
 729         }
 730         put_be24(pb, size);
 731     } else if (sc->codec->codec_id == CODEC_ID_DVVIDEO) {
 732         put_byte(pb, size / 4096);
 733         put_be24(pb, 0);
 734     } else
 735         put_be32(pb, size);
 736     put_be32(pb, dts);
 737     put_byte(pb, 1); /* flags */
 738     put_byte(pb, 0); /* reserved */
 739     return 16;
 740 }
 741
 742 static int gxf_write_media_packet(ByteIOContext *pb, GXFContext *ctx, AVPacket *pkt)
 743 {
 744     GXFStreamContext *sc = &ctx->streams[pkt->stream_index];
 745     offset_t pos = url_ftell(pb);
 746     int padding = 0;
 747
 748     gxf_write_packet_header(pb, PKT_MEDIA);
 749     if (sc->codec->codec_id == CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
 750         padding = 4 - pkt->size % 4;
 751     else if (sc->codec->codec_type == CODEC_TYPE_AUDIO)
 752         padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
 753     gxf_write_media_preamble(pb, ctx, pkt, pkt->size + padding);
 754     put_buffer(pb, pkt->data, pkt->size);
 755     gxf_write_padding(pb, padding);
 756     return updatePacketSize(pb, pos);
 757 }
 758
 759 static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
 760 {
 761     GXFContext *gxf = s->priv_data;
 762
 763     gxf_write_media_packet(&s->pb, gxf, pkt);
 764     put_flush_packet(&s->pb);
 765     return 0;
 766 }
 767
 768 static int gxf_new_audio_packet(GXFContext *gxf, GXFStreamContext *sc, AVPacket *pkt, int flush)
 769 {
 770     int size = flush ? av_fifo_size(&sc->audio_buffer) : GXF_AUDIO_PACKET_SIZE;
 771
 772     if (!size)
 773         return 0;
 774     av_new_packet(pkt, size);
 775     av_fifo_read(&sc->audio_buffer, pkt->data, size);
 776     pkt->stream_index = sc->index;
 777     pkt->dts = sc->current_dts;
 778     sc->current_dts += size / 2; /* we only support 16 bit pcm mono for now */
 779     return size;
 780 }
 781
 782 static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
 783 {
 784     GXFContext *gxf = s->priv_data;
 785     AVPacket new_pkt;
 786     int i;
 787
 788     for (i = 0; i < s->nb_streams; i++) {
 789         AVStream *st = s->streams[i];
 790         GXFStreamContext *sc = &gxf->streams[i];
 791         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 792             if (pkt && pkt->stream_index == i) {
 793                 av_fifo_write(&sc->audio_buffer, pkt->data, pkt->size);
 794                 pkt = NULL;
 795             }
 796             if (flush || av_fifo_size(&sc->audio_buffer) >= GXF_AUDIO_PACKET_SIZE) {
 797                 if (!pkt && gxf_new_audio_packet(gxf, sc, &new_pkt, flush) > 0) {
 798                     pkt = &new_pkt;
 799                     break; /* add pkt right now into list */
 800                 }
 801             }
 802         } else if (pkt) {
 803             /* adjust dts if negative */
 804             if (pkt->dts < 0 && !sc->dts_delay) {
 805                 /* XXX: rescale if codec time base is different from stream time base */
 806                 sc->dts_delay = av_rescale_q(pkt->dts, st->codec->time_base, st->time_base);
 807                 pkt->dts = sc->dts_delay; /* set to 0 */
 808             }
 809             pkt->dts -= sc->dts_delay;
 810         }
 811     }
 812     return av_interleave_packet_per_dts(s, out, pkt, flush);
 813 }
 814
 815 AVOutputFormat gxf_muxer = {
 816     "gxf",
 817     "GXF format",
 818     NULL,
 819     "gxf",
 820     sizeof(GXFContext),
 821     CODEC_ID_PCM_S16LE,
 822     CODEC_ID_MPEG2VIDEO,
 823     gxf_write_header,
 824     gxf_write_packet,
 825     gxf_write_trailer,
 826     0,
 827     NULL,
 828     gxf_interleave_packet,
 829 };