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
   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 "avformat.h"
  23 #include "gxf.h"
  24 #include "riff.h"
  25 #include "audiointerleave.h"
  26
  27 #define GXF_AUDIO_PACKET_SIZE 65536
  28
  29 typedef struct GXFStreamContext {
  30     AudioInterleaveContext aic;
  31     uint32_t track_type;
  32     uint32_t sample_size;
  33     uint32_t sample_rate;
  34     uint16_t media_type;
  35     uint16_t media_info;
  36     int frame_rate_index;
  37     int lines_index;
  38     int fields;
  39     int iframes;
  40     int pframes;
  41     int bframes;
  42     int p_per_gop;
  43     int b_per_i_or_p; ///< number of B frames per I frame or P frame
  44     int first_gop_closed;
  45     unsigned order;   ///< interleaving order
  46 } GXFStreamContext;
  47
  48 typedef struct GXFContext {
  49     uint32_t nb_fields;
  50     uint16_t audio_tracks;
  51     uint16_t mpeg_tracks;
  52     int64_t creation_time;
  53     uint32_t umf_start_offset;
  54     uint32_t umf_track_offset;
  55     uint32_t umf_media_offset;
  56     uint32_t umf_length;
  57     uint16_t umf_track_size;
  58     uint16_t umf_media_size;
  59     AVRational time_base;
  60     int flags;
  61     GXFStreamContext timecode_track;
  62     unsigned *flt_entries;    ///< offsets of packets /1024, starts after 2nd video field
  63     unsigned flt_entries_nb;
  64     uint64_t *map_offsets;    ///< offset of map packets
  65     unsigned map_offsets_nb;
  66     unsigned packet_count;
  67 } GXFContext;
  68
  69 static const struct {
  70     int height, index;
  71 } gxf_lines_tab[] = {
  72     { 480,  1 }, /* NTSC */
  73     { 512,  1 }, /* NTSC + VBI */
  74     { 576,  2 }, /* PAL */
  75     { 608,  2 }, /* PAL + VBI */
  76     { 1080, 4 },
  77     { 720,  6 },
  78 };
  79
  80 static const AVCodecTag gxf_media_types[] = {
  81     { CODEC_ID_MJPEG     ,   3 }, /* NTSC */
  82     { CODEC_ID_MJPEG     ,   4 }, /* PAL */
  83     { CODEC_ID_PCM_S24LE ,   9 },
  84     { CODEC_ID_PCM_S16LE ,  10 },
  85     { CODEC_ID_MPEG2VIDEO,  11 }, /* NTSC */
  86     { CODEC_ID_MPEG2VIDEO,  12 }, /* PAL */
  87     { CODEC_ID_DVVIDEO   ,  13 }, /* NTSC */
  88     { CODEC_ID_DVVIDEO   ,  14 }, /* PAL */
  89     { CODEC_ID_DVVIDEO   ,  15 }, /* 50M NTSC */
  90     { CODEC_ID_DVVIDEO   ,  16 }, /* 50M PAL */
  91     { CODEC_ID_AC3       ,  17 },
  92     //{ CODEC_ID_NONE,  ,   18 }, /* Non compressed 24 bit audio */
  93     { CODEC_ID_MPEG2VIDEO,  20 }, /* MPEG HD */
  94     { CODEC_ID_MPEG1VIDEO,  22 }, /* NTSC */
  95     { CODEC_ID_MPEG1VIDEO,  23 }, /* PAL */
  96     { 0, 0 },
  97 };
  98
  99 #define SERVER_PATH "EXT:/PDR/default/"
 100 #define ES_NAME_PATTERN "EXT:/PDR/default/ES."
 101
 102 static int gxf_find_lines_index(AVStream *st)
 103 {
 104     GXFStreamContext *sc = st->priv_data;
 105     int i;
 106
 107     for (i = 0; i < 6; ++i) {
 108         if (st->codec->height == gxf_lines_tab[i].height) {
 109             sc->lines_index = gxf_lines_tab[i].index;
 110             return 0;
 111         }
 112     }
 113     return -1;
 114 }
 115
 116 static void gxf_write_padding(ByteIOContext *pb, int64_t to_pad)
 117 {
 118     for (; to_pad > 0; to_pad--) {
 119         put_byte(pb, 0);
 120     }
 121 }
 122
 123 static int64_t updatePacketSize(ByteIOContext *pb, int64_t pos)
 124 {
 125     int64_t curpos;
 126     int size;
 127
 128     size = url_ftell(pb) - pos;
 129     if (size % 4) {
 130         gxf_write_padding(pb, 4 - size % 4);
 131         size = url_ftell(pb) - pos;
 132     }
 133     curpos = url_ftell(pb);
 134     url_fseek(pb, pos + 6, SEEK_SET);
 135     put_be32(pb, size);
 136     url_fseek(pb, curpos, SEEK_SET);
 137     return curpos - pos;
 138 }
 139
 140 static int64_t updateSize(ByteIOContext *pb, int64_t pos)
 141 {
 142     int64_t curpos;
 143
 144     curpos = url_ftell(pb);
 145     url_fseek(pb, pos, SEEK_SET);
 146     put_be16(pb, curpos - pos - 2);
 147     url_fseek(pb, curpos, SEEK_SET);
 148     return curpos - pos;
 149 }
 150
 151 static void gxf_write_packet_header(ByteIOContext *pb, GXFPktType type)
 152 {
 153     put_be32(pb, 0); /* packet leader for synchro */
 154     put_byte(pb, 1);
 155     put_byte(pb, type); /* map packet */
 156     put_be32(pb, 0); /* size */
 157     put_be32(pb, 0); /* reserved */
 158     put_byte(pb, 0xE1); /* trailer 1 */
 159     put_byte(pb, 0xE2); /* trailer 2 */
 160 }
 161
 162 static int gxf_write_mpeg_auxiliary(ByteIOContext *pb, AVStream *st)
 163 {
 164     GXFStreamContext *sc = st->priv_data;
 165     char buffer[1024];
 166     int size, starting_line;
 167
 168     if (sc->iframes) {
 169         sc->p_per_gop = sc->pframes / sc->iframes;
 170         if (sc->pframes % sc->iframes)
 171             sc->p_per_gop++;
 172         if (sc->pframes) {
 173             sc->b_per_i_or_p = sc->bframes / sc->pframes;
 174             if (sc->bframes % sc->pframes)
 175                 sc->b_per_i_or_p++;
 176         }
 177         if (sc->p_per_gop > 9)
 178             sc->p_per_gop = 9; /* ensure value won't take more than one char */
 179         if (sc->b_per_i_or_p > 9)
 180             sc->b_per_i_or_p = 9; /* ensure value won't take more than one char */
 181     }
 182     if (st->codec->height == 512 || st->codec->height == 608)
 183         starting_line = 7; // VBI
 184     else if (st->codec->height == 480)
 185         starting_line = 20;
 186     else
 187         starting_line = 23; // default PAL
 188
 189     size = snprintf(buffer, 1024, "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n"
 190                     "Pix 0\nCf %d\nCg %d\nSl %d\nnl16 %d\nVi 1\nf1 1\n",
 191                     (float)st->codec->bit_rate, sc->p_per_gop, sc->b_per_i_or_p,
 192                     st->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1, sc->first_gop_closed == 1,
 193                     starting_line, st->codec->height / 16);
 194     put_byte(pb, TRACK_MPG_AUX);
 195     put_byte(pb, size + 1);
 196     put_buffer(pb, (uint8_t *)buffer, size + 1);
 197     return size + 3;
 198 }
 199
 200 static int gxf_write_timecode_auxiliary(ByteIOContext *pb, GXFStreamContext *sc)
 201 {
 202     put_byte(pb, 0); /* fields */
 203     put_byte(pb, 0);  /* seconds */
 204     put_byte(pb, 0); /* minutes */
 205     put_byte(pb, 0); /* flags + hours */
 206     /* reserved */
 207     put_be32(pb, 0);
 208     return 8;
 209 }
 210
 211 static int gxf_write_track_description(AVFormatContext *s, GXFStreamContext *sc, int index)
 212 {
 213     ByteIOContext *pb = s->pb;
 214     int64_t pos;
 215     int mpeg = sc->track_type == 4 || sc->track_type == 9;
 216
 217     /* track description section */
 218     put_byte(pb, sc->media_type + 0x80);
 219     put_byte(pb, index + 0xC0);
 220
 221     pos = url_ftell(pb);
 222     put_be16(pb, 0); /* size */
 223
 224     /* media file name */
 225     put_byte(pb, TRACK_NAME);
 226     put_byte(pb, strlen(ES_NAME_PATTERN) + 3);
 227     put_tag(pb, ES_NAME_PATTERN);
 228     put_be16(pb, sc->media_info);
 229     put_byte(pb, 0);
 230
 231     if (!mpeg) {
 232         /* auxiliary information */
 233         put_byte(pb, TRACK_AUX);
 234         put_byte(pb, 8);
 235         if (sc->track_type == 3)
 236             gxf_write_timecode_auxiliary(pb, sc);
 237         else
 238             put_le64(pb, 0);
 239     }
 240
 241     /* file system version */
 242     put_byte(pb, TRACK_VER);
 243     put_byte(pb, 4);
 244     put_be32(pb, 0);
 245
 246     if (mpeg)
 247         gxf_write_mpeg_auxiliary(pb, s->streams[index]);
 248
 249     /* frame rate */
 250     put_byte(pb, TRACK_FPS);
 251     put_byte(pb, 4);
 252     put_be32(pb, sc->frame_rate_index);
 253
 254     /* lines per frame */
 255     put_byte(pb, TRACK_LINES);
 256     put_byte(pb, 4);
 257     put_be32(pb, sc->lines_index);
 258
 259     /* fields per frame */
 260     put_byte(pb, TRACK_FPF);
 261     put_byte(pb, 4);
 262     put_be32(pb, sc->fields);
 263
 264     return updateSize(pb, pos);
 265 }
 266
 267 static int gxf_write_material_data_section(AVFormatContext *s)
 268 {
 269     GXFContext *gxf = s->priv_data;
 270     ByteIOContext *pb = s->pb;
 271     int64_t pos;
 272     const char *filename = strrchr(s->filename, '/');
 273
 274     pos = url_ftell(pb);
 275     put_be16(pb, 0); /* size */
 276
 277     /* name */
 278     if (filename)
 279         filename++;
 280     else
 281         filename = s->filename;
 282     put_byte(pb, MAT_NAME);
 283     put_byte(pb, strlen(SERVER_PATH) + strlen(filename) + 1);
 284     put_tag(pb, SERVER_PATH);
 285     put_tag(pb, filename);
 286     put_byte(pb, 0);
 287
 288     /* first field */
 289     put_byte(pb, MAT_FIRST_FIELD);
 290     put_byte(pb, 4);
 291     put_be32(pb, 0);
 292
 293     /* last field */
 294     put_byte(pb, MAT_LAST_FIELD);
 295     put_byte(pb, 4);
 296     put_be32(pb, gxf->nb_fields);
 297
 298     /* reserved */
 299     put_byte(pb, MAT_MARK_IN);
 300     put_byte(pb, 4);
 301     put_be32(pb, 0);
 302
 303     put_byte(pb, MAT_MARK_OUT);
 304     put_byte(pb, 4);
 305     put_be32(pb, gxf->nb_fields);
 306
 307     /* estimated size */
 308     put_byte(pb, MAT_SIZE);
 309     put_byte(pb, 4);
 310     put_be32(pb, url_fsize(pb) / 1024);
 311
 312     return updateSize(pb, pos);
 313 }
 314
 315 static int gxf_write_track_description_section(AVFormatContext *s)
 316 {
 317     GXFContext *gxf = s->priv_data;
 318     ByteIOContext *pb = s->pb;
 319     int64_t pos;
 320     int i;
 321
 322     pos = url_ftell(pb);
 323     put_be16(pb, 0); /* size */
 324     for (i = 0; i < s->nb_streams; ++i)
 325         gxf_write_track_description(s, s->streams[i]->priv_data, i);
 326
 327     gxf_write_track_description(s, &gxf->timecode_track, s->nb_streams);
 328
 329     return updateSize(pb, pos);
 330 }
 331
 332 static int gxf_write_map_packet(AVFormatContext *s, int rewrite)
 333 {
 334     GXFContext *gxf = s->priv_data;
 335     ByteIOContext *pb = s->pb;
 336     int64_t pos = url_ftell(pb);
 337
 338     if (!rewrite) {
 339         if (!(gxf->map_offsets_nb % 30)) {
 340             gxf->map_offsets = av_realloc(gxf->map_offsets,
 341                                           (gxf->map_offsets_nb+30)*sizeof(*gxf->map_offsets));
 342             if (!gxf->map_offsets) {
 343                 av_log(s, AV_LOG_ERROR, "could not realloc map offsets\n");
 344                 return -1;
 345             }
 346         }
 347         gxf->map_offsets[gxf->map_offsets_nb++] = pos; // do not increment here
 348     }
 349
 350     gxf_write_packet_header(pb, PKT_MAP);
 351
 352     /* preamble */
 353     put_byte(pb, 0xE0); /* version */
 354     put_byte(pb, 0xFF); /* reserved */
 355
 356     gxf_write_material_data_section(s);
 357     gxf_write_track_description_section(s);
 358
 359     return updatePacketSize(pb, pos);
 360 }
 361
 362 static int gxf_write_flt_packet(AVFormatContext *s)
 363 {
 364     GXFContext *gxf = s->priv_data;
 365     ByteIOContext *pb = s->pb;
 366     int64_t pos = url_ftell(pb);
 367     int fields_per_flt = (gxf->nb_fields+1) / 1000 + 1;
 368     int flt_entries = gxf->nb_fields / fields_per_flt - 1;
 369     int i = 0;
 370
 371     gxf_write_packet_header(pb, PKT_FLT);
 372
 373     put_le32(pb, fields_per_flt); /* number of fields */
 374     put_le32(pb, flt_entries); /* number of active flt entries */
 375
 376     if (gxf->flt_entries) {
 377         for (i = 0; i < flt_entries; i++)
 378             put_le32(pb, gxf->flt_entries[(i*fields_per_flt)>>1]);
 379     }
 380
 381     for (; i < 1000; i++)
 382         put_le32(pb, 0);
 383
 384     return updatePacketSize(pb, pos);
 385 }
 386
 387 static int gxf_write_umf_material_description(AVFormatContext *s)
 388 {
 389     GXFContext *gxf = s->priv_data;
 390     ByteIOContext *pb = s->pb;
 391     int timecode_base = gxf->time_base.den == 60000 ? 60 : 50;
 392
 393     // XXX drop frame
 394     uint32_t timecode =
 395         gxf->nb_fields / (timecode_base * 3600) % 24 << 24 | // hours
 396         gxf->nb_fields / (timecode_base * 60) % 60   << 16 | // minutes
 397         gxf->nb_fields /  timecode_base % 60         <<  8 | // seconds
 398         gxf->nb_fields %  timecode_base;                     // fields
 399
 400     put_le32(pb, gxf->flags);
 401     put_le32(pb, gxf->nb_fields); /* length of the longest track */
 402     put_le32(pb, gxf->nb_fields); /* length of the shortest track */
 403     put_le32(pb, 0); /* mark in */
 404     put_le32(pb, gxf->nb_fields); /* mark out */
 405     put_le32(pb, 0); /* timecode mark in */
 406     put_le32(pb, timecode); /* timecode mark out */
 407     put_le64(pb, s->timestamp); /* modification time */
 408     put_le64(pb, s->timestamp); /* creation time */
 409     put_le16(pb, 0); /* reserved */
 410     put_le16(pb, 0); /* reserved */
 411     put_le16(pb, gxf->audio_tracks);
 412     put_le16(pb, 1); /* timecode track count */
 413     put_le16(pb, 0); /* reserved */
 414     put_le16(pb, gxf->mpeg_tracks);
 415     return 48;
 416 }
 417
 418 static int gxf_write_umf_payload(AVFormatContext *s)
 419 {
 420     GXFContext *gxf = s->priv_data;
 421     ByteIOContext *pb = s->pb;
 422
 423     put_le32(pb, gxf->umf_length); /* total length of the umf data */
 424     put_le32(pb, 3); /* version */
 425     put_le32(pb, s->nb_streams+1);
 426     put_le32(pb, gxf->umf_track_offset); /* umf track section offset */
 427     put_le32(pb, gxf->umf_track_size);
 428     put_le32(pb, s->nb_streams+1);
 429     put_le32(pb, gxf->umf_media_offset);
 430     put_le32(pb, gxf->umf_media_size);
 431     put_le32(pb, gxf->umf_length); /* user data offset */
 432     put_le32(pb, 0); /* user data size */
 433     put_le32(pb, 0); /* reserved */
 434     put_le32(pb, 0); /* reserved */
 435     return 48;
 436 }
 437
 438 static int gxf_write_umf_track_description(AVFormatContext *s)
 439 {
 440     ByteIOContext *pb = s->pb;
 441     GXFContext *gxf = s->priv_data;
 442     int64_t pos = url_ftell(pb);
 443     int i;
 444
 445     gxf->umf_track_offset = pos - gxf->umf_start_offset;
 446     for (i = 0; i < s->nb_streams; ++i) {
 447         GXFStreamContext *sc = s->streams[i]->priv_data;
 448         put_le16(pb, sc->media_info);
 449         put_le16(pb, 1);
 450     }
 451
 452     put_le16(pb, gxf->timecode_track.media_info);
 453     put_le16(pb, 1);
 454
 455     return url_ftell(pb) - pos;
 456 }
 457
 458 static int gxf_write_umf_media_mpeg(ByteIOContext *pb, AVStream *st)
 459 {
 460     GXFStreamContext *sc = st->priv_data;
 461
 462     if (st->codec->pix_fmt == PIX_FMT_YUV422P)
 463         put_le32(pb, 2);
 464     else
 465         put_le32(pb, 1); /* default to 420 */
 466     put_le32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
 467     put_le32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
 468     put_le32(pb, 1); /* I picture per GOP */
 469     put_le32(pb, sc->p_per_gop);
 470     put_le32(pb, sc->b_per_i_or_p);
 471     if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO)
 472         put_le32(pb, 2);
 473     else if (st->codec->codec_id == CODEC_ID_MPEG1VIDEO)
 474         put_le32(pb, 1);
 475     else
 476         put_le32(pb, 0);
 477     put_le32(pb, 0); /* reserved */
 478     return 32;
 479 }
 480
 481 static int gxf_write_umf_media_timecode(ByteIOContext *pb, GXFStreamContext *sc)
 482 {
 483     put_le32(pb, 1); /* non drop frame */
 484     put_le32(pb, 0); /* reserved */
 485     put_le32(pb, 0); /* reserved */
 486     put_le32(pb, 0); /* reserved */
 487     put_le32(pb, 0); /* reserved */
 488     put_le32(pb, 0); /* reserved */
 489     put_le32(pb, 0); /* reserved */
 490     put_le32(pb, 0); /* reserved */
 491     return 32;
 492 }
 493
 494 static int gxf_write_umf_media_dv(ByteIOContext *pb, GXFStreamContext *sc)
 495 {
 496     int i;
 497
 498     for (i = 0; i < 8; i++) {
 499         put_be32(pb, 0);
 500     }
 501     return 32;
 502 }
 503
 504 static int gxf_write_umf_media_audio(ByteIOContext *pb, GXFStreamContext *sc)
 505 {
 506     put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
 507     put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
 508     put_le32(pb, 0); /* number of fields over which to ramp up sound level */
 509     put_le32(pb, 0); /* number of fields over which to ramp down sound level */
 510     put_le32(pb, 0); /* reserved */
 511     put_le32(pb, 0); /* reserved */
 512     return 32;
 513 }
 514
 515 #if 0
 516 static int gxf_write_umf_media_mjpeg(ByteIOContext *pb, GXFStreamContext *sc)
 517 {
 518     put_be64(pb, 0); /* FIXME FLOAT max chroma quant level */
 519     put_be64(pb, 0); /* FIXME FLOAT max luma quant level */
 520     put_be64(pb, 0); /* FIXME FLOAT min chroma quant level */
 521     put_be64(pb, 0); /* FIXME FLOAT min luma quant level */
 522     return 32;
 523 }
 524 #endif
 525
 526 static int gxf_write_umf_media_description(AVFormatContext *s)
 527 {
 528     GXFContext *gxf = s->priv_data;
 529     ByteIOContext *pb = s->pb;
 530     int64_t pos;
 531     int i, j;
 532
 533     pos = url_ftell(pb);
 534     gxf->umf_media_offset = pos - gxf->umf_start_offset;
 535     for (i = 0; i <= s->nb_streams; ++i) {
 536         GXFStreamContext *sc;
 537         int64_t startpos, curpos;
 538
 539         if (i == s->nb_streams)
 540             sc = &gxf->timecode_track;
 541         else
 542             sc = s->streams[i]->priv_data;
 543
 544         startpos = url_ftell(pb);
 545         put_le16(pb, 0); /* length */
 546         put_le16(pb, sc->media_info);
 547         put_le16(pb, 0); /* reserved */
 548         put_le16(pb, 0); /* reserved */
 549         put_le32(pb, gxf->nb_fields);
 550         put_le32(pb, 0); /* attributes rw, ro */
 551         put_le32(pb, 0); /* mark in */
 552         put_le32(pb, gxf->nb_fields); /* mark out */
 553         put_buffer(pb, ES_NAME_PATTERN, sizeof(ES_NAME_PATTERN));
 554         put_be16(pb, sc->media_info);
 555         for (j = sizeof(ES_NAME_PATTERN)+2; j < 88; j++)
 556             put_byte(pb, 0);
 557         put_le32(pb, sc->track_type);
 558         put_le32(pb, sc->sample_rate);
 559         put_le32(pb, sc->sample_size);
 560         put_le32(pb, 0); /* reserved */
 561
 562         if (sc == &gxf->timecode_track)
 563             gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
 564         else {
 565             AVStream *st = s->streams[i];
 566             switch (st->codec->codec_id) {
 567             case CODEC_ID_MPEG2VIDEO:
 568                 gxf_write_umf_media_mpeg(pb, st);
 569                 break;
 570             case CODEC_ID_PCM_S16LE:
 571                 gxf_write_umf_media_audio(pb, sc);
 572                 break;
 573             case CODEC_ID_DVVIDEO:
 574                 gxf_write_umf_media_dv(pb, sc);
 575                 break;
 576             }
 577         }
 578
 579         curpos = url_ftell(pb);
 580         url_fseek(pb, startpos, SEEK_SET);
 581         put_le16(pb, curpos - startpos);
 582         url_fseek(pb, curpos, SEEK_SET);
 583     }
 584     return url_ftell(pb) - pos;
 585 }
 586
 587 static int gxf_write_umf_packet(AVFormatContext *s)
 588 {
 589     GXFContext *gxf = s->priv_data;
 590     ByteIOContext *pb = s->pb;
 591     int64_t pos = url_ftell(pb);
 592
 593     gxf_write_packet_header(pb, PKT_UMF);
 594
 595     /* preamble */
 596     put_byte(pb, 3); /* first and last (only) packet */
 597     put_be32(pb, gxf->umf_length); /* data length */
 598
 599     gxf->umf_start_offset = url_ftell(pb);
 600     gxf_write_umf_payload(s);
 601     gxf_write_umf_material_description(s);
 602     gxf->umf_track_size = gxf_write_umf_track_description(s);
 603     gxf->umf_media_size = gxf_write_umf_media_description(s);
 604     gxf->umf_length = url_ftell(pb) - gxf->umf_start_offset;
 605     return updatePacketSize(pb, pos);
 606 }
 607
 608 static const int GXF_samples_per_frame[] = { 32768, 0 };
 609
 610 static void gxf_init_timecode_track(GXFStreamContext *sc, GXFStreamContext *vsc)
 611 {
 612     if (!vsc)
 613         return;
 614
 615     sc->media_type = vsc->sample_rate == 60 ? 7 : 8;
 616     sc->sample_rate = vsc->sample_rate;
 617     sc->media_info = ('T'<<8) | '0';
 618     sc->track_type = 3;
 619     sc->frame_rate_index = vsc->frame_rate_index;
 620     sc->lines_index = vsc->lines_index;
 621     sc->sample_size = 16;
 622     sc->fields = vsc->fields;
 623 }
 624
 625 static int gxf_write_header(AVFormatContext *s)
 626 {
 627     ByteIOContext *pb = s->pb;
 628     GXFContext *gxf = s->priv_data;
 629     GXFStreamContext *vsc = NULL;
 630     uint8_t tracks[255] = {0};
 631     int i, media_info = 0;
 632
 633     if (url_is_streamed(pb)) {
 634         av_log(s, AV_LOG_ERROR, "gxf muxer does not support streamed output, patch welcome");
 635         return -1;
 636     }
 637
 638     gxf->flags |= 0x00080000; /* material is simple clip */
 639     for (i = 0; i < s->nb_streams; ++i) {
 640         AVStream *st = s->streams[i];
 641         GXFStreamContext *sc = av_mallocz(sizeof(*sc));
 642         if (!sc)
 643             return AVERROR(ENOMEM);
 644         st->priv_data = sc;
 645
 646         sc->media_type = ff_codec_get_tag(gxf_media_types, st->codec->codec_id);
 647         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 648             if (st->codec->codec_id != CODEC_ID_PCM_S16LE) {
 649                 av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
 650                 return -1;
 651             }
 652             if (st->codec->sample_rate != 48000) {
 653                 av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
 654                 return -1;
 655             }
 656             if (st->codec->channels != 1) {
 657                 av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
 658                 return -1;
 659             }
 660             sc->track_type = 2;
 661             sc->sample_rate = st->codec->sample_rate;
 662             av_set_pts_info(st, 64, 1, sc->sample_rate);
 663             sc->sample_size = 16;
 664             sc->frame_rate_index = -2;
 665             sc->lines_index = -2;
 666             sc->fields = -2;
 667             gxf->audio_tracks++;
 668             gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
 669             media_info = 'A';
 670         } else if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 671             if (i != 0) {
 672                 av_log(s, AV_LOG_ERROR, "video stream must be the first track\n");
 673                 return -1;
 674             }
 675             /* FIXME check from time_base ? */
 676             if (st->codec->height == 480 || st->codec->height == 512) { /* NTSC or NTSC+VBI */
 677                 sc->frame_rate_index = 5;
 678                 sc->sample_rate = 60;
 679                 gxf->flags |= 0x00000080;
 680                 gxf->time_base = (AVRational){ 1001, 60000 };
 681             } else { /* assume PAL */
 682                 sc->frame_rate_index = 6;
 683                 sc->media_type++;
 684                 sc->sample_rate = 50;
 685                 gxf->flags |= 0x00000040;
 686                 gxf->time_base = (AVRational){ 1, 50 };
 687             }
 688             av_set_pts_info(st, 64, gxf->time_base.num, gxf->time_base.den);
 689             if (gxf_find_lines_index(st) < 0)
 690                 sc->lines_index = -1;
 691             sc->sample_size = st->codec->bit_rate;
 692             sc->fields = 2; /* interlaced */
 693
 694             vsc = sc;
 695
 696             switch (st->codec->codec_id) {
 697             case CODEC_ID_MJPEG:
 698                 sc->track_type = 1;
 699                 gxf->flags |= 0x00004000;
 700                 media_info = 'J';
 701                 break;
 702             case CODEC_ID_MPEG1VIDEO:
 703                 sc->track_type = 9;
 704                 gxf->mpeg_tracks++;
 705                 media_info = 'L';
 706                 break;
 707             case CODEC_ID_MPEG2VIDEO:
 708                 sc->first_gop_closed = -1;
 709                 sc->track_type = 4;
 710                 gxf->mpeg_tracks++;
 711                 gxf->flags |= 0x00008000;
 712                 media_info = 'M';
 713                 break;
 714             case CODEC_ID_DVVIDEO:
 715                 if (st->codec->pix_fmt == PIX_FMT_YUV422P) {
 716                     sc->media_type += 2;
 717                     sc->track_type = 6;
 718                     gxf->flags |= 0x00002000;
 719                     media_info = 'E';
 720                 } else {
 721                     sc->track_type = 5;
 722                     gxf->flags |= 0x00001000;
 723                     media_info = 'D';
 724                 }
 725                 break;
 726             default:
 727                 av_log(s, AV_LOG_ERROR, "video codec not supported\n");
 728                 return -1;
 729             }
 730         }
 731         /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
 732         sc->media_info = media_info<<8 | ('0'+tracks[media_info]++);
 733         sc->order = s->nb_streams - st->index;
 734     }
 735
 736     if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0)
 737         return -1;
 738
 739     gxf_init_timecode_track(&gxf->timecode_track, vsc);
 740     gxf->flags |= 0x200000; // time code track is non-drop frame
 741
 742     gxf_write_map_packet(s, 0);
 743     gxf_write_flt_packet(s);
 744     gxf_write_umf_packet(s);
 745
 746     gxf->packet_count = 3;
 747
 748     put_flush_packet(pb);
 749     return 0;
 750 }
 751
 752 static int gxf_write_eos_packet(ByteIOContext *pb)
 753 {
 754     int64_t pos = url_ftell(pb);
 755
 756     gxf_write_packet_header(pb, PKT_EOS);
 757     return updatePacketSize(pb, pos);
 758 }
 759
 760 static int gxf_write_trailer(AVFormatContext *s)
 761 {
 762     GXFContext *gxf = s->priv_data;
 763     ByteIOContext *pb = s->pb;
 764     int64_t end;
 765     int i;
 766
 767     ff_audio_interleave_close(s);
 768
 769     gxf_write_eos_packet(pb);
 770     end = url_ftell(pb);
 771     url_fseek(pb, 0, SEEK_SET);
 772     /* overwrite map, flt and umf packets with new values */
 773     gxf_write_map_packet(s, 1);
 774     gxf_write_flt_packet(s);
 775     gxf_write_umf_packet(s);
 776     put_flush_packet(pb);
 777     /* update duration in all map packets */
 778     for (i = 1; i < gxf->map_offsets_nb; i++) {
 779         url_fseek(pb, gxf->map_offsets[i], SEEK_SET);
 780         gxf_write_map_packet(s, 1);
 781         put_flush_packet(pb);
 782     }
 783
 784     url_fseek(pb, end, SEEK_SET);
 785
 786     av_freep(&gxf->flt_entries);
 787     av_freep(&gxf->map_offsets);
 788
 789     return 0;
 790 }
 791
 792 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
 793 {
 794     uint32_t c=-1;
 795     int i;
 796     for(i=0; i<size-4 && c!=0x100; i++){
 797         c = (c<<8) + buf[i];
 798         if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
 799             sc->first_gop_closed= (buf[i+4]>>6)&1;
 800     }
 801     return (buf[i+1]>>3)&7;
 802 }
 803
 804 static int gxf_write_media_preamble(AVFormatContext *s, AVPacket *pkt, int size)
 805 {
 806     GXFContext *gxf = s->priv_data;
 807     ByteIOContext *pb = s->pb;
 808     AVStream *st = s->streams[pkt->stream_index];
 809     GXFStreamContext *sc = st->priv_data;
 810     unsigned field_nb;
 811     /* If the video is frame-encoded, the frame numbers shall be represented by
 812      * even field numbers.
 813      * see SMPTE360M-2004  6.4.2.1.3 Media field number */
 814     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 815         field_nb = gxf->nb_fields;
 816     } else {
 817         field_nb = av_rescale_rnd(pkt->dts, gxf->time_base.den,
 818                                   (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
 819     }
 820
 821     put_byte(pb, sc->media_type);
 822     put_byte(pb, st->index);
 823     put_be32(pb, field_nb);
 824     if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 825         put_be16(pb, 0);
 826         put_be16(pb, size / 2);
 827     } else if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
 828         int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
 829         if (frame_type == FF_I_TYPE) {
 830             put_byte(pb, 0x0d);
 831             sc->iframes++;
 832         } else if (frame_type == FF_B_TYPE) {
 833             put_byte(pb, 0x0f);
 834             sc->bframes++;
 835         } else {
 836             put_byte(pb, 0x0e);
 837             sc->pframes++;
 838         }
 839         put_be24(pb, size);
 840     } else if (st->codec->codec_id == CODEC_ID_DVVIDEO) {
 841         put_byte(pb, size / 4096);
 842         put_be24(pb, 0);
 843     } else
 844         put_be32(pb, size);
 845     put_be32(pb, field_nb);
 846     put_byte(pb, 1); /* flags */
 847     put_byte(pb, 0); /* reserved */
 848     return 16;
 849 }
 850
 851 static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
 852 {
 853     GXFContext *gxf = s->priv_data;
 854     ByteIOContext *pb = s->pb;
 855     AVStream *st = s->streams[pkt->stream_index];
 856     int64_t pos = url_ftell(pb);
 857     int padding = 0;
 858
 859     gxf_write_packet_header(pb, PKT_MEDIA);
 860     if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
 861         padding = 4 - pkt->size % 4;
 862     else if (st->codec->codec_type == CODEC_TYPE_AUDIO)
 863         padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
 864     gxf_write_media_preamble(s, pkt, pkt->size + padding);
 865     put_buffer(pb, pkt->data, pkt->size);
 866     gxf_write_padding(pb, padding);
 867
 868     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 869         if (!(gxf->flt_entries_nb % 500)) {
 870             gxf->flt_entries = av_realloc(gxf->flt_entries,
 871                                           (gxf->flt_entries_nb+500)*sizeof(*gxf->flt_entries));
 872             if (!gxf->flt_entries) {
 873                 av_log(s, AV_LOG_ERROR, "could not reallocate flt entries\n");
 874                 return -1;
 875             }
 876         }
 877         gxf->flt_entries[gxf->flt_entries_nb++] = url_ftell(pb) / 1024;
 878         gxf->nb_fields += 2; // count fields
 879     }
 880
 881     updatePacketSize(pb, pos);
 882
 883     gxf->packet_count++;
 884     if (gxf->packet_count == 100) {
 885         gxf_write_map_packet(s, 0);
 886         gxf->packet_count = 0;
 887     }
 888
 889     put_flush_packet(pb);
 890
 891     return 0;
 892 }
 893
 894 static int gxf_compare_field_nb(AVFormatContext *s, AVPacket *next, AVPacket *cur)
 895 {
 896     GXFContext *gxf = s->priv_data;
 897     AVPacket *pkt[2] = { cur, next };
 898     int i, field_nb[2];
 899     GXFStreamContext *sc[2];
 900
 901     for (i = 0; i < 2; i++) {
 902         AVStream *st = s->streams[pkt[i]->stream_index];
 903         sc[i] = st->priv_data;
 904         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 905             field_nb[i] = av_rescale_rnd(pkt[i]->dts, gxf->time_base.den,
 906                                          (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
 907             field_nb[i] &= ~1; // compare against even field number because audio must be before video
 908         } else
 909             field_nb[i] = pkt[i]->dts; // dts are field based
 910     }
 911
 912     return field_nb[1] > field_nb[0] ||
 913         (field_nb[1] == field_nb[0] && sc[1]->order > sc[0]->order);
 914 }
 915
 916 static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
 917 {
 918     if (pkt && s->streams[pkt->stream_index]->codec->codec_type == CODEC_TYPE_VIDEO)
 919         pkt->duration = 2; // enforce 2 fields
 920     return ff_audio_rechunk_interleave(s, out, pkt, flush,
 921                                av_interleave_packet_per_dts, gxf_compare_field_nb);
 922 }
 923
 924 AVOutputFormat gxf_muxer = {
 925     "gxf",
 926     NULL_IF_CONFIG_SMALL("GXF format"),
 927     NULL,
 928     "gxf",
 929     sizeof(GXFContext),
 930     CODEC_ID_PCM_S16LE,
 931     CODEC_ID_MPEG2VIDEO,
 932     gxf_write_header,
 933     gxf_write_packet,
 934     gxf_write_trailer,
 935     0,
 936     NULL,
 937     gxf_interleave_packet,
 938 };