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 "libavutil/fifo.h"
  23 #include "avformat.h"
  24 #include "gxf.h"
  25 #include "riff.h"
  26 #include "audiointerleave.h"
  27
  28 #define GXF_AUDIO_PACKET_SIZE 65536
  29
  30 typedef struct GXFStreamContext {
  31     AudioInterleaveContext aic;
  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     int frame_rate_index;
  38     int lines_index;
  39     int fields;
  40     int iframes;
  41     int pframes;
  42     int bframes;
  43     int p_per_gop;
  44     int b_per_i_or_p; ///< number of B frames per I frame or P frame
  45     int first_gop_closed;
  46     unsigned order;   ///< interleaving order
  47 } GXFStreamContext;
  48
  49 typedef struct GXFContext {
  50     uint32_t nb_fields;
  51     uint16_t audio_tracks;
  52     uint16_t mpeg_tracks;
  53     int64_t creation_time;
  54     uint32_t umf_start_offset;
  55     uint32_t umf_track_offset;
  56     uint32_t umf_media_offset;
  57     uint32_t umf_length;
  58     uint16_t umf_track_size;
  59     uint16_t umf_media_size;
  60     AVRational time_base;
  61     int flags;
  62     GXFStreamContext timecode_track;
  63     unsigned *flt_entries;    ///< offsets of packets /1024, starts after 2nd video field
  64     unsigned flt_entries_nb;
  65     uint64_t *map_offsets;    ///< offset of map packets
  66     unsigned map_offsets_nb;
  67     unsigned packet_count;
  68 } GXFContext;
  69
  70 static const struct {
  71     int height, index;
  72 } gxf_lines_tab[] = {
  73     { 480,  1 }, /* NTSC */
  74     { 512,  1 }, /* NTSC + VBI */
  75     { 576,  2 }, /* PAL */
  76     { 608,  2 }, /* PAL + VBI */
  77     { 1080, 4 },
  78     { 720,  6 },
  79 };
  80
  81 static const AVCodecTag gxf_media_types[] = {
  82     { CODEC_ID_MJPEG     ,   3 }, /* NTSC */
  83     { CODEC_ID_MJPEG     ,   4 }, /* PAL */
  84     { CODEC_ID_PCM_S24LE ,   9 },
  85     { CODEC_ID_PCM_S16LE ,  10 },
  86     { CODEC_ID_MPEG2VIDEO,  11 }, /* NTSC */
  87     { CODEC_ID_MPEG2VIDEO,  12 }, /* PAL */
  88     { CODEC_ID_DVVIDEO   ,  13 }, /* NTSC */
  89     { CODEC_ID_DVVIDEO   ,  14 }, /* PAL */
  90     { CODEC_ID_DVVIDEO   ,  15 }, /* 50M NTSC */
  91     { CODEC_ID_DVVIDEO   ,  16 }, /* 50M PAL */
  92     { CODEC_ID_AC3       ,  17 },
  93     //{ CODEC_ID_NONE,  ,   18 }, /* Non compressed 24 bit audio */
  94     { CODEC_ID_MPEG2VIDEO,  20 }, /* MPEG HD */
  95     { CODEC_ID_MPEG1VIDEO,  22 }, /* NTSC */
  96     { CODEC_ID_MPEG1VIDEO,  23 }, /* PAL */
  97     { 0, 0 },
  98 };
  99
 100 #define SERVER_PATH "EXT:/PDR/default/"
 101 #define ES_NAME_PATTERN "EXT:/PDR/default/ES."
 102
 103 static int gxf_find_lines_index(AVStream *st)
 104 {
 105     GXFStreamContext *sc = st->priv_data;
 106     int i;
 107
 108     for (i = 0; i < 6; ++i) {
 109         if (st->codec->height == gxf_lines_tab[i].height) {
 110             sc->lines_index = gxf_lines_tab[i].index;
 111             return 0;
 112         }
 113     }
 114     return -1;
 115 }
 116
 117 static void gxf_write_padding(ByteIOContext *pb, int64_t to_pad)
 118 {
 119     for (; to_pad > 0; to_pad--) {
 120         put_byte(pb, 0);
 121     }
 122 }
 123
 124 static int64_t updatePacketSize(ByteIOContext *pb, int64_t pos)
 125 {
 126     int64_t curpos;
 127     int size;
 128
 129     size = url_ftell(pb) - pos;
 130     if (size % 4) {
 131         gxf_write_padding(pb, 4 - size % 4);
 132         size = url_ftell(pb) - pos;
 133     }
 134     curpos = url_ftell(pb);
 135     url_fseek(pb, pos + 6, SEEK_SET);
 136     put_be32(pb, size);
 137     url_fseek(pb, curpos, SEEK_SET);
 138     return curpos - pos;
 139 }
 140
 141 static int64_t updateSize(ByteIOContext *pb, int64_t pos)
 142 {
 143     int64_t curpos;
 144
 145     curpos = url_ftell(pb);
 146     url_fseek(pb, pos, SEEK_SET);
 147     put_be16(pb, curpos - pos - 2);
 148     url_fseek(pb, curpos, SEEK_SET);
 149     return curpos - pos;
 150 }
 151
 152 static void gxf_write_packet_header(ByteIOContext *pb, GXFPktType type)
 153 {
 154     put_be32(pb, 0); /* packet leader for synchro */
 155     put_byte(pb, 1);
 156     put_byte(pb, type); /* map packet */
 157     put_be32(pb, 0); /* size */
 158     put_be32(pb, 0); /* reserved */
 159     put_byte(pb, 0xE1); /* trailer 1 */
 160     put_byte(pb, 0xE2); /* trailer 2 */
 161 }
 162
 163 static int gxf_write_mpeg_auxiliary(ByteIOContext *pb, AVStream *st)
 164 {
 165     GXFStreamContext *sc = st->priv_data;
 166     char buffer[1024];
 167     int size, starting_line;
 168
 169     if (sc->iframes) {
 170         sc->p_per_gop = sc->pframes / sc->iframes;
 171         if (sc->pframes % sc->iframes)
 172             sc->p_per_gop++;
 173         if (sc->pframes) {
 174             sc->b_per_i_or_p = sc->bframes / sc->pframes;
 175             if (sc->bframes % sc->pframes)
 176                 sc->b_per_i_or_p++;
 177         }
 178         if (sc->p_per_gop > 9)
 179             sc->p_per_gop = 9; /* ensure value won't take more than one char */
 180         if (sc->b_per_i_or_p > 9)
 181             sc->b_per_i_or_p = 9; /* ensure value won't take more than one char */
 182     }
 183     if (st->codec->height == 512 || st->codec->height == 608)
 184         starting_line = 7; // VBI
 185     else if (st->codec->height == 480)
 186         starting_line = 20;
 187     else
 188         starting_line = 23; // default PAL
 189
 190     size = snprintf(buffer, 1024, "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n"
 191                     "Pix 0\nCf %d\nCg %d\nSl %d\nnl16 %d\nVi 1\nf1 1\n",
 192                     (float)st->codec->bit_rate, sc->p_per_gop, sc->b_per_i_or_p,
 193                     st->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1, sc->first_gop_closed == 1,
 194                     starting_line, st->codec->height / 16);
 195     put_byte(pb, TRACK_MPG_AUX);
 196     put_byte(pb, size + 1);
 197     put_buffer(pb, (uint8_t *)buffer, size + 1);
 198     return size + 3;
 199 }
 200
 201 static int gxf_write_timecode_auxiliary(ByteIOContext *pb, GXFStreamContext *sc)
 202 {
 203     put_byte(pb, 0); /* fields */
 204     put_byte(pb, 0);  /* seconds */
 205     put_byte(pb, 0); /* minutes */
 206     put_byte(pb, 0); /* flags + hours */
 207     /* reserved */
 208     put_be32(pb, 0);
 209     return 8;
 210 }
 211
 212 static int gxf_write_track_description(AVFormatContext *s, GXFStreamContext *sc, int index)
 213 {
 214     ByteIOContext *pb = s->pb;
 215     int64_t pos;
 216     int mpeg = sc->track_type == 4 || sc->track_type == 9;
 217
 218     /* track description section */
 219     put_byte(pb, sc->media_type + 0x80);
 220     put_byte(pb, index + 0xC0);
 221
 222     pos = url_ftell(pb);
 223     put_be16(pb, 0); /* size */
 224
 225     /* media file name */
 226     put_byte(pb, TRACK_NAME);
 227     put_byte(pb, strlen(ES_NAME_PATTERN) + 3);
 228     put_tag(pb, ES_NAME_PATTERN);
 229     put_be16(pb, sc->media_info);
 230     put_byte(pb, 0);
 231
 232     if (!mpeg) {
 233         /* auxiliary information */
 234         put_byte(pb, TRACK_AUX);
 235         put_byte(pb, 8);
 236         if (sc->track_type == 3)
 237             gxf_write_timecode_auxiliary(pb, sc);
 238         else
 239             put_le64(pb, 0);
 240     }
 241
 242     /* file system version */
 243     put_byte(pb, TRACK_VER);
 244     put_byte(pb, 4);
 245     put_be32(pb, 0);
 246
 247     if (mpeg)
 248         gxf_write_mpeg_auxiliary(pb, s->streams[index]);
 249
 250     /* frame rate */
 251     put_byte(pb, TRACK_FPS);
 252     put_byte(pb, 4);
 253     put_be32(pb, sc->frame_rate_index);
 254
 255     /* lines per frame */
 256     put_byte(pb, TRACK_LINES);
 257     put_byte(pb, 4);
 258     put_be32(pb, sc->lines_index);
 259
 260     /* fields per frame */
 261     put_byte(pb, TRACK_FPF);
 262     put_byte(pb, 4);
 263     put_be32(pb, sc->fields);
 264
 265     return updateSize(pb, pos);
 266 }
 267
 268 static int gxf_write_material_data_section(AVFormatContext *s)
 269 {
 270     GXFContext *gxf = s->priv_data;
 271     ByteIOContext *pb = s->pb;
 272     int64_t pos;
 273     const char *filename = strrchr(s->filename, '/');
 274
 275     pos = url_ftell(pb);
 276     put_be16(pb, 0); /* size */
 277
 278     /* name */
 279     if (filename)
 280         filename++;
 281     else
 282         filename = s->filename;
 283     put_byte(pb, MAT_NAME);
 284     put_byte(pb, strlen(SERVER_PATH) + strlen(filename) + 1);
 285     put_tag(pb, SERVER_PATH);
 286     put_tag(pb, filename);
 287     put_byte(pb, 0);
 288
 289     /* first field */
 290     put_byte(pb, MAT_FIRST_FIELD);
 291     put_byte(pb, 4);
 292     put_be32(pb, 0);
 293
 294     /* last field */
 295     put_byte(pb, MAT_LAST_FIELD);
 296     put_byte(pb, 4);
 297     put_be32(pb, gxf->nb_fields);
 298
 299     /* reserved */
 300     put_byte(pb, MAT_MARK_IN);
 301     put_byte(pb, 4);
 302     put_be32(pb, 0);
 303
 304     put_byte(pb, MAT_MARK_OUT);
 305     put_byte(pb, 4);
 306     put_be32(pb, gxf->nb_fields);
 307
 308     /* estimated size */
 309     put_byte(pb, MAT_SIZE);
 310     put_byte(pb, 4);
 311     put_be32(pb, url_fsize(pb) / 1024);
 312
 313     return updateSize(pb, pos);
 314 }
 315
 316 static int gxf_write_track_description_section(AVFormatContext *s)
 317 {
 318     GXFContext *gxf = s->priv_data;
 319     ByteIOContext *pb = s->pb;
 320     int64_t pos;
 321     int i;
 322
 323     pos = url_ftell(pb);
 324     put_be16(pb, 0); /* size */
 325     for (i = 0; i < s->nb_streams; ++i)
 326         gxf_write_track_description(s, s->streams[i]->priv_data, i);
 327
 328     gxf_write_track_description(s, &gxf->timecode_track, s->nb_streams);
 329
 330     return updateSize(pb, pos);
 331 }
 332
 333 static int gxf_write_map_packet(AVFormatContext *s, int rewrite)
 334 {
 335     GXFContext *gxf = s->priv_data;
 336     ByteIOContext *pb = s->pb;
 337     int64_t pos = url_ftell(pb);
 338
 339     if (!rewrite) {
 340         if (!(gxf->map_offsets_nb % 30)) {
 341             gxf->map_offsets = av_realloc(gxf->map_offsets,
 342                                           (gxf->map_offsets_nb+30)*sizeof(*gxf->map_offsets));
 343             if (!gxf->map_offsets) {
 344                 av_log(s, AV_LOG_ERROR, "could not realloc map offsets\n");
 345                 return -1;
 346             }
 347         }
 348         gxf->map_offsets[gxf->map_offsets_nb++] = pos; // do not increment here
 349     }
 350
 351     gxf_write_packet_header(pb, PKT_MAP);
 352
 353     /* preamble */
 354     put_byte(pb, 0xE0); /* version */
 355     put_byte(pb, 0xFF); /* reserved */
 356
 357     gxf_write_material_data_section(s);
 358     gxf_write_track_description_section(s);
 359
 360     return updatePacketSize(pb, pos);
 361 }
 362
 363 static int gxf_write_flt_packet(AVFormatContext *s)
 364 {
 365     GXFContext *gxf = s->priv_data;
 366     ByteIOContext *pb = s->pb;
 367     int64_t pos = url_ftell(pb);
 368     int fields_per_flt = (gxf->nb_fields+1) / 1000 + 1;
 369     int flt_entries = gxf->nb_fields / fields_per_flt - 1;
 370     int i = 0;
 371
 372     gxf_write_packet_header(pb, PKT_FLT);
 373
 374     put_le32(pb, fields_per_flt); /* number of fields */
 375     put_le32(pb, flt_entries); /* number of active flt entries */
 376
 377     if (gxf->flt_entries) {
 378         for (i = 0; i < flt_entries; i++)
 379             put_le32(pb, gxf->flt_entries[(i*fields_per_flt)>>1]);
 380     }
 381
 382     for (; i < 1000; i++)
 383         put_le32(pb, 0);
 384
 385     return updatePacketSize(pb, pos);
 386 }
 387
 388 static int gxf_write_umf_material_description(AVFormatContext *s)
 389 {
 390     GXFContext *gxf = s->priv_data;
 391     ByteIOContext *pb = s->pb;
 392     int timecode_base = gxf->time_base.den == 60000 ? 60 : 50;
 393
 394     // XXX drop frame
 395     uint32_t timecode =
 396         gxf->nb_fields / (timecode_base * 3600) % 24 << 24 | // hours
 397         gxf->nb_fields / (timecode_base * 60) % 60   << 16 | // minutes
 398         gxf->nb_fields /  timecode_base % 60         <<  8 | // seconds
 399         gxf->nb_fields %  timecode_base;                     // fields
 400
 401     put_le32(pb, gxf->flags);
 402     put_le32(pb, gxf->nb_fields); /* length of the longest track */
 403     put_le32(pb, gxf->nb_fields); /* length of the shortest track */
 404     put_le32(pb, 0); /* mark in */
 405     put_le32(pb, gxf->nb_fields); /* mark out */
 406     put_le32(pb, 0); /* timecode mark in */
 407     put_le32(pb, timecode); /* timecode mark out */
 408     put_le64(pb, s->timestamp); /* modification time */
 409     put_le64(pb, s->timestamp); /* creation time */
 410     put_le16(pb, 0); /* reserved */
 411     put_le16(pb, 0); /* reserved */
 412     put_le16(pb, gxf->audio_tracks);
 413     put_le16(pb, 1); /* timecode track count */
 414     put_le16(pb, 0); /* reserved */
 415     put_le16(pb, gxf->mpeg_tracks);
 416     return 48;
 417 }
 418
 419 static int gxf_write_umf_payload(AVFormatContext *s)
 420 {
 421     GXFContext *gxf = s->priv_data;
 422     ByteIOContext *pb = s->pb;
 423
 424     put_le32(pb, gxf->umf_length); /* total length of the umf data */
 425     put_le32(pb, 3); /* version */
 426     put_le32(pb, s->nb_streams+1);
 427     put_le32(pb, gxf->umf_track_offset); /* umf track section offset */
 428     put_le32(pb, gxf->umf_track_size);
 429     put_le32(pb, s->nb_streams+1);
 430     put_le32(pb, gxf->umf_media_offset);
 431     put_le32(pb, gxf->umf_media_size);
 432     put_le32(pb, gxf->umf_length); /* user data offset */
 433     put_le32(pb, 0); /* user data size */
 434     put_le32(pb, 0); /* reserved */
 435     put_le32(pb, 0); /* reserved */
 436     return 48;
 437 }
 438
 439 static int gxf_write_umf_track_description(AVFormatContext *s)
 440 {
 441     ByteIOContext *pb = s->pb;
 442     GXFContext *gxf = s->priv_data;
 443     int64_t pos = url_ftell(pb);
 444     int i;
 445
 446     gxf->umf_track_offset = pos - gxf->umf_start_offset;
 447     for (i = 0; i < s->nb_streams; ++i) {
 448         GXFStreamContext *sc = s->streams[i]->priv_data;
 449         put_le16(pb, sc->media_info);
 450         put_le16(pb, 1);
 451     }
 452
 453     put_le16(pb, gxf->timecode_track.media_info);
 454     put_le16(pb, 1);
 455
 456     return url_ftell(pb) - pos;
 457 }
 458
 459 static int gxf_write_umf_media_mpeg(ByteIOContext *pb, AVStream *st)
 460 {
 461     GXFStreamContext *sc = st->priv_data;
 462
 463     if (st->codec->pix_fmt == PIX_FMT_YUV422P)
 464         put_le32(pb, 2);
 465     else
 466         put_le32(pb, 1); /* default to 420 */
 467     put_le32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
 468     put_le32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
 469     put_le32(pb, 1); /* I picture per GOP */
 470     put_le32(pb, sc->p_per_gop);
 471     put_le32(pb, sc->b_per_i_or_p);
 472     if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO)
 473         put_le32(pb, 2);
 474     else if (st->codec->codec_id == CODEC_ID_MPEG1VIDEO)
 475         put_le32(pb, 1);
 476     else
 477         put_le32(pb, 0);
 478     put_le32(pb, 0); /* reserved */
 479     return 32;
 480 }
 481
 482 static int gxf_write_umf_media_timecode(ByteIOContext *pb, GXFStreamContext *sc)
 483 {
 484     put_le32(pb, 1); /* non drop frame */
 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     put_le32(pb, 0); /* reserved */
 492     return 32;
 493 }
 494
 495 static int gxf_write_umf_media_dv(ByteIOContext *pb, GXFStreamContext *sc)
 496 {
 497     int i;
 498
 499     for (i = 0; i < 8; i++) {
 500         put_be32(pb, 0);
 501     }
 502     return 32;
 503 }
 504
 505 static int gxf_write_umf_media_audio(ByteIOContext *pb, GXFStreamContext *sc)
 506 {
 507     put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
 508     put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
 509     put_le32(pb, 0); /* number of fields over which to ramp up sound level */
 510     put_le32(pb, 0); /* number of fields over which to ramp down sound level */
 511     put_le32(pb, 0); /* reserved */
 512     put_le32(pb, 0); /* reserved */
 513     return 32;
 514 }
 515
 516 #if 0
 517 static int gxf_write_umf_media_mjpeg(ByteIOContext *pb, GXFStreamContext *sc)
 518 {
 519     put_be64(pb, 0); /* FIXME FLOAT max chroma quant level */
 520     put_be64(pb, 0); /* FIXME FLOAT max luma quant level */
 521     put_be64(pb, 0); /* FIXME FLOAT min chroma quant level */
 522     put_be64(pb, 0); /* FIXME FLOAT min luma quant level */
 523     return 32;
 524 }
 525 #endif
 526
 527 static int gxf_write_umf_media_description(AVFormatContext *s)
 528 {
 529     GXFContext *gxf = s->priv_data;
 530     ByteIOContext *pb = s->pb;
 531     int64_t pos;
 532     int i, j;
 533
 534     pos = url_ftell(pb);
 535     gxf->umf_media_offset = pos - gxf->umf_start_offset;
 536     for (i = 0; i <= s->nb_streams; ++i) {
 537         GXFStreamContext *sc;
 538         int64_t startpos, curpos;
 539
 540         if (i == s->nb_streams)
 541             sc = &gxf->timecode_track;
 542         else
 543             sc = s->streams[i]->priv_data;
 544
 545         startpos = url_ftell(pb);
 546         put_le16(pb, 0); /* length */
 547         put_le16(pb, sc->media_info);
 548         put_le16(pb, 0); /* reserved */
 549         put_le16(pb, 0); /* reserved */
 550         put_le32(pb, gxf->nb_fields);
 551         put_le32(pb, 0); /* attributes rw, ro */
 552         put_le32(pb, 0); /* mark in */
 553         put_le32(pb, gxf->nb_fields); /* mark out */
 554         put_buffer(pb, ES_NAME_PATTERN, sizeof(ES_NAME_PATTERN));
 555         put_be16(pb, sc->media_info);
 556         for (j = sizeof(ES_NAME_PATTERN)+2; j < 88; j++)
 557             put_byte(pb, 0);
 558         put_le32(pb, sc->track_type);
 559         put_le32(pb, sc->sample_rate);
 560         put_le32(pb, sc->sample_size);
 561         put_le32(pb, 0); /* reserved */
 562
 563         if (sc == &gxf->timecode_track)
 564             gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
 565         else {
 566             AVStream *st = s->streams[i];
 567             switch (st->codec->codec_id) {
 568             case CODEC_ID_MPEG2VIDEO:
 569                 gxf_write_umf_media_mpeg(pb, st);
 570                 break;
 571             case CODEC_ID_PCM_S16LE:
 572                 gxf_write_umf_media_audio(pb, sc);
 573                 break;
 574             case CODEC_ID_DVVIDEO:
 575                 gxf_write_umf_media_dv(pb, sc);
 576                 break;
 577             }
 578         }
 579
 580         curpos = url_ftell(pb);
 581         url_fseek(pb, startpos, SEEK_SET);
 582         put_le16(pb, curpos - startpos);
 583         url_fseek(pb, curpos, SEEK_SET);
 584     }
 585     return url_ftell(pb) - pos;
 586 }
 587
 588 static int gxf_write_umf_packet(AVFormatContext *s)
 589 {
 590     GXFContext *gxf = s->priv_data;
 591     ByteIOContext *pb = s->pb;
 592     int64_t pos = url_ftell(pb);
 593
 594     gxf_write_packet_header(pb, PKT_UMF);
 595
 596     /* preamble */
 597     put_byte(pb, 3); /* first and last (only) packet */
 598     put_be32(pb, gxf->umf_length); /* data length */
 599
 600     gxf->umf_start_offset = url_ftell(pb);
 601     gxf_write_umf_payload(s);
 602     gxf_write_umf_material_description(s);
 603     gxf->umf_track_size = gxf_write_umf_track_description(s);
 604     gxf->umf_media_size = gxf_write_umf_media_description(s);
 605     gxf->umf_length = url_ftell(pb) - gxf->umf_start_offset;
 606     return updatePacketSize(pb, pos);
 607 }
 608
 609 static const int GXF_samples_per_frame[] = { 32768, 0 };
 610
 611 static void gxf_init_timecode_track(GXFStreamContext *sc, GXFStreamContext *vsc)
 612 {
 613     if (!vsc)
 614         return;
 615
 616     sc->media_type = vsc->sample_rate == 60 ? 7 : 8;
 617     sc->sample_rate = vsc->sample_rate;
 618     sc->media_info = ('T'<<8) | '0';
 619     sc->track_type = 3;
 620     sc->frame_rate_index = vsc->frame_rate_index;
 621     sc->lines_index = vsc->lines_index;
 622     sc->sample_size = 16;
 623     sc->fields = vsc->fields;
 624 }
 625
 626 static int gxf_write_header(AVFormatContext *s)
 627 {
 628     ByteIOContext *pb = s->pb;
 629     GXFContext *gxf = s->priv_data;
 630     GXFStreamContext *vsc = NULL;
 631     uint8_t tracks[255] = {0};
 632     int i, media_info = 0;
 633
 634     if (url_is_streamed(pb)) {
 635         av_log(s, AV_LOG_ERROR, "gxf muxer does not support streamed output, patch welcome");
 636         return -1;
 637     }
 638
 639     gxf->flags |= 0x00080000; /* material is simple clip */
 640     for (i = 0; i < s->nb_streams; ++i) {
 641         AVStream *st = s->streams[i];
 642         GXFStreamContext *sc = av_mallocz(sizeof(*sc));
 643         if (!sc)
 644             return AVERROR(ENOMEM);
 645         st->priv_data = sc;
 646
 647         sc->media_type = codec_get_tag(gxf_media_types, st->codec->codec_id);
 648         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 649             if (st->codec->codec_id != CODEC_ID_PCM_S16LE) {
 650                 av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
 651                 return -1;
 652             }
 653             if (st->codec->sample_rate != 48000) {
 654                 av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
 655                 return -1;
 656             }
 657             if (st->codec->channels != 1) {
 658                 av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
 659                 return -1;
 660             }
 661             sc->track_type = 2;
 662             sc->sample_rate = st->codec->sample_rate;
 663             av_set_pts_info(st, 64, 1, sc->sample_rate);
 664             sc->sample_size = 16;
 665             sc->frame_rate_index = -2;
 666             sc->lines_index = -2;
 667             sc->fields = -2;
 668             gxf->audio_tracks++;
 669             gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
 670             media_info = 'A';
 671         } else if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 672             if (i != 0) {
 673                 av_log(s, AV_LOG_ERROR, "video stream must be the first track\n");
 674                 return -1;
 675             }
 676             /* FIXME check from time_base ? */
 677             if (st->codec->height == 480 || st->codec->height == 512) { /* NTSC or NTSC+VBI */
 678                 sc->frame_rate_index = 5;
 679                 sc->sample_rate = 60;
 680                 gxf->flags |= 0x00000080;
 681                 gxf->time_base = (AVRational){ 1001, 60000 };
 682             } else { /* assume PAL */
 683                 sc->frame_rate_index = 6;
 684                 sc->media_type++;
 685                 sc->sample_rate = 50;
 686                 gxf->flags |= 0x00000040;
 687                 gxf->time_base = (AVRational){ 1, 50 };
 688             }
 689             av_set_pts_info(st, 64, gxf->time_base.num, gxf->time_base.den);
 690             if (gxf_find_lines_index(st) < 0)
 691                 sc->lines_index = -1;
 692             sc->sample_size = st->codec->bit_rate;
 693             sc->fields = 2; /* interlaced */
 694
 695             vsc = sc;
 696
 697             switch (st->codec->codec_id) {
 698             case CODEC_ID_MJPEG:
 699                 sc->track_type = 1;
 700                 gxf->flags |= 0x00004000;
 701                 media_info = 'J';
 702                 break;
 703             case CODEC_ID_MPEG1VIDEO:
 704                 sc->track_type = 9;
 705                 gxf->mpeg_tracks++;
 706                 media_info = 'L';
 707                 break;
 708             case CODEC_ID_MPEG2VIDEO:
 709                 sc->first_gop_closed = -1;
 710                 sc->track_type = 4;
 711                 gxf->mpeg_tracks++;
 712                 gxf->flags |= 0x00008000;
 713                 media_info = 'M';
 714                 break;
 715             case CODEC_ID_DVVIDEO:
 716                 if (st->codec->pix_fmt == PIX_FMT_YUV422P) {
 717                     sc->media_type += 2;
 718                     sc->track_type = 6;
 719                     gxf->flags |= 0x00002000;
 720                     media_info = 'E';
 721                 } else {
 722                     sc->track_type = 5;
 723                     gxf->flags |= 0x00001000;
 724                     media_info = 'D';
 725                 }
 726                 break;
 727             default:
 728                 av_log(s, AV_LOG_ERROR, "video codec not supported\n");
 729                 return -1;
 730             }
 731         }
 732         /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
 733         sc->media_info = media_info<<8 | ('0'+tracks[media_info]++);
 734         sc->order = s->nb_streams - st->index;
 735     }
 736
 737     if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0)
 738         return -1;
 739
 740     gxf_init_timecode_track(&gxf->timecode_track, vsc);
 741     gxf->flags |= 0x200000; // time code track is non-drop frame
 742
 743     gxf_write_map_packet(s, 0);
 744     gxf_write_flt_packet(s);
 745     gxf_write_umf_packet(s);
 746
 747     gxf->packet_count = 3;
 748
 749     put_flush_packet(pb);
 750     return 0;
 751 }
 752
 753 static int gxf_write_eos_packet(ByteIOContext *pb)
 754 {
 755     int64_t pos = url_ftell(pb);
 756
 757     gxf_write_packet_header(pb, PKT_EOS);
 758     return updatePacketSize(pb, pos);
 759 }
 760
 761 static int gxf_write_trailer(AVFormatContext *s)
 762 {
 763     GXFContext *gxf = s->priv_data;
 764     ByteIOContext *pb = s->pb;
 765     int64_t end;
 766     int i;
 767
 768     ff_audio_interleave_close(s);
 769
 770     gxf_write_eos_packet(pb);
 771     end = url_ftell(pb);
 772     url_fseek(pb, 0, SEEK_SET);
 773     /* overwrite map, flt and umf packets with new values */
 774     gxf_write_map_packet(s, 1);
 775     gxf_write_flt_packet(s);
 776     gxf_write_umf_packet(s);
 777     put_flush_packet(pb);
 778     /* update duration in all map packets */
 779     for (i = 1; i < gxf->map_offsets_nb; i++) {
 780         url_fseek(pb, gxf->map_offsets[i], SEEK_SET);
 781         gxf_write_map_packet(s, 1);
 782         put_flush_packet(pb);
 783     }
 784
 785     url_fseek(pb, end, SEEK_SET);
 786
 787     av_freep(&gxf->flt_entries);
 788     av_freep(&gxf->map_offsets);
 789
 790     return 0;
 791 }
 792
 793 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
 794 {
 795     uint32_t c=-1;
 796     int i;
 797     for(i=0; i<size-4 && c!=0x100; i++){
 798         c = (c<<8) + buf[i];
 799         if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
 800             sc->first_gop_closed= (buf[i+4]>>6)&1;
 801     }
 802     return (buf[i+1]>>3)&7;
 803 }
 804
 805 static int gxf_write_media_preamble(AVFormatContext *s, AVPacket *pkt, int size)
 806 {
 807     GXFContext *gxf = s->priv_data;
 808     ByteIOContext *pb = s->pb;
 809     AVStream *st = s->streams[pkt->stream_index];
 810     GXFStreamContext *sc = st->priv_data;
 811     unsigned field_nb;
 812     /* If the video is frame-encoded, the frame numbers shall be represented by
 813      * even field numbers.
 814      * see SMPTE360M-2004  6.4.2.1.3 Media field number */
 815     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 816         field_nb = gxf->nb_fields;
 817     } else {
 818         field_nb = av_rescale_rnd(pkt->dts, gxf->time_base.den,
 819                                   (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
 820     }
 821
 822     put_byte(pb, sc->media_type);
 823     put_byte(pb, st->index);
 824     put_be32(pb, field_nb);
 825     if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 826         put_be16(pb, 0);
 827         put_be16(pb, size / 2);
 828     } else if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
 829         int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
 830         if (frame_type == FF_I_TYPE) {
 831             put_byte(pb, 0x0d);
 832             sc->iframes++;
 833         } else if (frame_type == FF_B_TYPE) {
 834             put_byte(pb, 0x0f);
 835             sc->bframes++;
 836         } else {
 837             put_byte(pb, 0x0e);
 838             sc->pframes++;
 839         }
 840         put_be24(pb, size);
 841     } else if (st->codec->codec_id == CODEC_ID_DVVIDEO) {
 842         put_byte(pb, size / 4096);
 843         put_be24(pb, 0);
 844     } else
 845         put_be32(pb, size);
 846     put_be32(pb, field_nb);
 847     put_byte(pb, 1); /* flags */
 848     put_byte(pb, 0); /* reserved */
 849     return 16;
 850 }
 851
 852 static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
 853 {
 854     GXFContext *gxf = s->priv_data;
 855     ByteIOContext *pb = s->pb;
 856     AVStream *st = s->streams[pkt->stream_index];
 857     int64_t pos = url_ftell(pb);
 858     int padding = 0;
 859
 860     gxf_write_packet_header(pb, PKT_MEDIA);
 861     if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
 862         padding = 4 - pkt->size % 4;
 863     else if (st->codec->codec_type == CODEC_TYPE_AUDIO)
 864         padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
 865     gxf_write_media_preamble(s, pkt, pkt->size + padding);
 866     put_buffer(pb, pkt->data, pkt->size);
 867     gxf_write_padding(pb, padding);
 868
 869     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 870         if (!(gxf->flt_entries_nb % 500)) {
 871             gxf->flt_entries = av_realloc(gxf->flt_entries,
 872                                           (gxf->flt_entries_nb+500)*sizeof(*gxf->flt_entries));
 873             if (!gxf->flt_entries) {
 874                 av_log(s, AV_LOG_ERROR, "could not reallocate flt entries\n");
 875                 return -1;
 876             }
 877         }
 878         gxf->flt_entries[gxf->flt_entries_nb++] = url_ftell(pb) / 1024;
 879         gxf->nb_fields += 2; // count fields
 880     }
 881
 882     updatePacketSize(pb, pos);
 883
 884     gxf->packet_count++;
 885     if (gxf->packet_count == 100) {
 886         gxf_write_map_packet(s, 0);
 887         gxf->packet_count = 0;
 888     }
 889
 890     put_flush_packet(pb);
 891
 892     return 0;
 893 }
 894
 895 static int gxf_compare_field_nb(AVFormatContext *s, AVPacket *next, AVPacket *cur)
 896 {
 897     GXFContext *gxf = s->priv_data;
 898     AVPacket *pkt[2] = { cur, next };
 899     int i, field_nb[2];
 900     GXFStreamContext *sc[2];
 901
 902     for (i = 0; i < 2; i++) {
 903         AVStream *st = s->streams[pkt[i]->stream_index];
 904         sc[i] = st->priv_data;
 905         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 906             field_nb[i] = av_rescale_rnd(pkt[i]->dts, gxf->time_base.den,
 907                                          (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
 908             field_nb[i] &= ~1; // compare against even field number because audio must be before video
 909         } else
 910             field_nb[i] = pkt[i]->dts; // dts are field based
 911     }
 912
 913     return field_nb[1] > field_nb[0] ||
 914         (field_nb[1] == field_nb[0] && sc[1]->order > sc[0]->order);
 915 }
 916
 917 static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
 918 {
 919     if (pkt && s->streams[pkt->stream_index]->codec->codec_type == CODEC_TYPE_VIDEO)
 920         pkt->duration = 2; // enforce 2 fields
 921     return ff_audio_rechunk_interleave(s, out, pkt, flush,
 922                                av_interleave_packet_per_dts, gxf_compare_field_nb);
 923 }
 924
 925 AVOutputFormat gxf_muxer = {
 926     "gxf",
 927     NULL_IF_CONFIG_SMALL("GXF format"),
 928     NULL,
 929     "gxf",
 930     sizeof(GXFContext),
 931     CODEC_ID_PCM_S16LE,
 932     CODEC_ID_MPEG2VIDEO,
 933     gxf_write_header,
 934     gxf_write_packet,
 935     gxf_write_trailer,
 936     0,
 937     NULL,
 938     gxf_interleave_packet,
 939 };