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 Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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/intfloat.h"
  23 #include "libavutil/mathematics.h"
  24 #include "avformat.h"
  25 #include "internal.h"
  26 #include "gxf.h"
  27 #include "audiointerleave.h"
  28
  29 #define GXF_AUDIO_PACKET_SIZE 65536
  30
  31 typedef struct GXFStreamContext {
  32     AudioInterleaveContext aic;
  33     uint32_t track_type;
  34     uint32_t sample_size;
  35     uint32_t sample_rate;
  36     uint16_t media_type;
  37     uint16_t media_info;
  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_i_or_p; ///< number of B frames per I frame or P frame
  46     int first_gop_closed;
  47     unsigned order;   ///< interleaving order
  48 } GXFStreamContext;
  49
  50 typedef struct GXFContext {
  51     uint32_t nb_fields;
  52     uint16_t audio_tracks;
  53     uint16_t mpeg_tracks;
  54     int64_t creation_time;
  55     uint32_t umf_start_offset;
  56     uint32_t umf_track_offset;
  57     uint32_t umf_media_offset;
  58     uint32_t umf_length;
  59     uint16_t umf_track_size;
  60     uint16_t umf_media_size;
  61     AVRational time_base;
  62     int flags;
  63     GXFStreamContext timecode_track;
  64     unsigned *flt_entries;    ///< offsets of packets /1024, starts after 2nd video field
  65     unsigned flt_entries_nb;
  66     uint64_t *map_offsets;    ///< offset of map packets
  67     unsigned map_offsets_nb;
  68     unsigned packet_count;
  69 } GXFContext;
  70
  71 static const struct {
  72     int height, index;
  73 } gxf_lines_tab[] = {
  74     { 480,  1 }, /* NTSC */
  75     { 512,  1 }, /* NTSC + VBI */
  76     { 576,  2 }, /* PAL */
  77     { 608,  2 }, /* PAL + VBI */
  78     { 1080, 4 },
  79     { 720,  6 },
  80 };
  81
  82 static const AVCodecTag gxf_media_types[] = {
  83     { AV_CODEC_ID_MJPEG     ,   3 }, /* NTSC */
  84     { AV_CODEC_ID_MJPEG     ,   4 }, /* PAL */
  85     { AV_CODEC_ID_PCM_S24LE ,   9 },
  86     { AV_CODEC_ID_PCM_S16LE ,  10 },
  87     { AV_CODEC_ID_MPEG2VIDEO,  11 }, /* NTSC */
  88     { AV_CODEC_ID_MPEG2VIDEO,  12 }, /* PAL */
  89     { AV_CODEC_ID_DVVIDEO   ,  13 }, /* NTSC */
  90     { AV_CODEC_ID_DVVIDEO   ,  14 }, /* PAL */
  91     { AV_CODEC_ID_DVVIDEO   ,  15 }, /* 50M NTSC */
  92     { AV_CODEC_ID_DVVIDEO   ,  16 }, /* 50M PAL */
  93     { AV_CODEC_ID_AC3       ,  17 },
  94     //{ AV_CODEC_ID_NONE,  ,   18 }, /* Non compressed 24 bit audio */
  95     { AV_CODEC_ID_MPEG2VIDEO,  20 }, /* MPEG HD */
  96     { AV_CODEC_ID_MPEG1VIDEO,  22 }, /* NTSC */
  97     { AV_CODEC_ID_MPEG1VIDEO,  23 }, /* PAL */
  98     { AV_CODEC_ID_NONE,         0 },
  99 };
 100
 101 #define SERVER_PATH "EXT:/PDR/default/"
 102 #define ES_NAME_PATTERN "EXT:/PDR/default/ES."
 103
 104 static int gxf_find_lines_index(AVStream *st)
 105 {
 106     GXFStreamContext *sc = st->priv_data;
 107     int i;
 108
 109     for (i = 0; i < 6; ++i) {
 110         if (st->codec->height == gxf_lines_tab[i].height) {
 111             sc->lines_index = gxf_lines_tab[i].index;
 112             return 0;
 113         }
 114     }
 115     return -1;
 116 }
 117
 118 static void gxf_write_padding(AVIOContext *pb, int64_t to_pad)
 119 {
 120     for (; to_pad > 0; to_pad--) {
 121         avio_w8(pb, 0);
 122     }
 123 }
 124
 125 static int64_t updatePacketSize(AVIOContext *pb, int64_t pos)
 126 {
 127     int64_t curpos;
 128     int size;
 129
 130     size = avio_tell(pb) - pos;
 131     if (size % 4) {
 132         gxf_write_padding(pb, 4 - size % 4);
 133         size = avio_tell(pb) - pos;
 134     }
 135     curpos = avio_tell(pb);
 136     avio_seek(pb, pos + 6, SEEK_SET);
 137     avio_wb32(pb, size);
 138     avio_seek(pb, curpos, SEEK_SET);
 139     return curpos - pos;
 140 }
 141
 142 static int64_t updateSize(AVIOContext *pb, int64_t pos)
 143 {
 144     int64_t curpos;
 145
 146     curpos = avio_tell(pb);
 147     avio_seek(pb, pos, SEEK_SET);
 148     avio_wb16(pb, curpos - pos - 2);
 149     avio_seek(pb, curpos, SEEK_SET);
 150     return curpos - pos;
 151 }
 152
 153 static void gxf_write_packet_header(AVIOContext *pb, GXFPktType type)
 154 {
 155     avio_wb32(pb, 0);  /* packet leader for synchro */
 156     avio_w8(pb, 1);
 157     avio_w8(pb, type); /* map packet */
 158     avio_wb32(pb, 0);  /* size */
 159     avio_wb32(pb, 0);  /* reserved */
 160     avio_w8(pb, 0xE1); /* trailer 1 */
 161     avio_w8(pb, 0xE2); /* trailer 2 */
 162 }
 163
 164 static int gxf_write_mpeg_auxiliary(AVIOContext *pb, AVStream *st)
 165 {
 166     GXFStreamContext *sc = st->priv_data;
 167     char buffer[1024];
 168     int size, starting_line;
 169
 170     if (sc->iframes) {
 171         sc->p_per_gop = sc->pframes / sc->iframes;
 172         if (sc->pframes % sc->iframes)
 173             sc->p_per_gop++;
 174         if (sc->pframes) {
 175             sc->b_per_i_or_p = sc->bframes / sc->pframes;
 176             if (sc->bframes % sc->pframes)
 177                 sc->b_per_i_or_p++;
 178         }
 179         if (sc->p_per_gop > 9)
 180             sc->p_per_gop = 9; /* ensure value won't take more than one char */
 181         if (sc->b_per_i_or_p > 9)
 182             sc->b_per_i_or_p = 9; /* ensure value won't take more than one char */
 183     }
 184     if (st->codec->height == 512 || st->codec->height == 608)
 185         starting_line = 7; // VBI
 186     else if (st->codec->height == 480)
 187         starting_line = 20;
 188     else
 189         starting_line = 23; // default PAL
 190
 191     size = snprintf(buffer, 1024, "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n"
 192                     "Pix 0\nCf %d\nCg %d\nSl %d\nnl16 %d\nVi 1\nf1 1\n",
 193                     (float)st->codec->bit_rate, sc->p_per_gop, sc->b_per_i_or_p,
 194                     st->codec->pix_fmt == AV_PIX_FMT_YUV422P ? 2 : 1, sc->first_gop_closed == 1,
 195                     starting_line, (st->codec->height + 15) / 16);
 196     avio_w8(pb, TRACK_MPG_AUX);
 197     avio_w8(pb, size + 1);
 198     avio_write(pb, (uint8_t *)buffer, size + 1);
 199     return size + 3;
 200 }
 201
 202 static int gxf_write_timecode_auxiliary(AVIOContext *pb, GXFStreamContext *sc)
 203 {
 204     avio_w8(pb, 0); /* fields */
 205     avio_w8(pb, 0); /* seconds */
 206     avio_w8(pb, 0); /* minutes */
 207     avio_w8(pb, 0); /* flags + hours */
 208     /* reserved */
 209     avio_wb32(pb, 0);
 210     return 8;
 211 }
 212
 213 static int gxf_write_track_description(AVFormatContext *s, GXFStreamContext *sc, int index)
 214 {
 215     AVIOContext *pb = s->pb;
 216     int64_t pos;
 217     int mpeg = sc->track_type == 4 || sc->track_type == 9;
 218
 219     /* track description section */
 220     avio_w8(pb, sc->media_type + 0x80);
 221     avio_w8(pb, index + 0xC0);
 222
 223     pos = avio_tell(pb);
 224     avio_wb16(pb, 0); /* size */
 225
 226     /* media file name */
 227     avio_w8(pb, TRACK_NAME);
 228     avio_w8(pb, strlen(ES_NAME_PATTERN) + 3);
 229     avio_write(pb, ES_NAME_PATTERN, sizeof(ES_NAME_PATTERN) - 1);
 230     avio_wb16(pb, sc->media_info);
 231     avio_w8(pb, 0);
 232
 233     if (!mpeg) {
 234         /* auxiliary information */
 235         avio_w8(pb, TRACK_AUX);
 236         avio_w8(pb, 8);
 237         if (sc->track_type == 3)
 238             gxf_write_timecode_auxiliary(pb, sc);
 239         else
 240             avio_wl64(pb, 0);
 241     }
 242
 243     /* file system version */
 244     avio_w8(pb, TRACK_VER);
 245     avio_w8(pb, 4);
 246     avio_wb32(pb, 0);
 247
 248     if (mpeg)
 249         gxf_write_mpeg_auxiliary(pb, s->streams[index]);
 250
 251     /* frame rate */
 252     avio_w8(pb, TRACK_FPS);
 253     avio_w8(pb, 4);
 254     avio_wb32(pb, sc->frame_rate_index);
 255
 256     /* lines per frame */
 257     avio_w8(pb, TRACK_LINES);
 258     avio_w8(pb, 4);
 259     avio_wb32(pb, sc->lines_index);
 260
 261     /* fields per frame */
 262     avio_w8(pb, TRACK_FPF);
 263     avio_w8(pb, 4);
 264     avio_wb32(pb, sc->fields);
 265
 266     return updateSize(pb, pos);
 267 }
 268
 269 static int gxf_write_material_data_section(AVFormatContext *s)
 270 {
 271     GXFContext *gxf = s->priv_data;
 272     AVIOContext *pb = s->pb;
 273     int64_t pos;
 274     int len;
 275     const char *filename = strrchr(s->filename, '/');
 276
 277     pos = avio_tell(pb);
 278     avio_wb16(pb, 0); /* size */
 279
 280     /* name */
 281     if (filename)
 282         filename++;
 283     else
 284         filename = s->filename;
 285     len = strlen(filename);
 286
 287     avio_w8(pb, MAT_NAME);
 288     avio_w8(pb, strlen(SERVER_PATH) + len + 1);
 289     avio_write(pb, SERVER_PATH, sizeof(SERVER_PATH) - 1);
 290     avio_write(pb, filename, len);
 291     avio_w8(pb, 0);
 292
 293     /* first field */
 294     avio_w8(pb, MAT_FIRST_FIELD);
 295     avio_w8(pb, 4);
 296     avio_wb32(pb, 0);
 297
 298     /* last field */
 299     avio_w8(pb, MAT_LAST_FIELD);
 300     avio_w8(pb, 4);
 301     avio_wb32(pb, gxf->nb_fields);
 302
 303     /* reserved */
 304     avio_w8(pb, MAT_MARK_IN);
 305     avio_w8(pb, 4);
 306     avio_wb32(pb, 0);
 307
 308     avio_w8(pb, MAT_MARK_OUT);
 309     avio_w8(pb, 4);
 310     avio_wb32(pb, gxf->nb_fields);
 311
 312     /* estimated size */
 313     avio_w8(pb, MAT_SIZE);
 314     avio_w8(pb, 4);
 315     avio_wb32(pb, avio_size(pb) / 1024);
 316
 317     return updateSize(pb, pos);
 318 }
 319
 320 static int gxf_write_track_description_section(AVFormatContext *s)
 321 {
 322     GXFContext *gxf = s->priv_data;
 323     AVIOContext *pb = s->pb;
 324     int64_t pos;
 325     int i;
 326
 327     pos = avio_tell(pb);
 328     avio_wb16(pb, 0); /* size */
 329     for (i = 0; i < s->nb_streams; ++i)
 330         gxf_write_track_description(s, s->streams[i]->priv_data, i);
 331
 332     gxf_write_track_description(s, &gxf->timecode_track, s->nb_streams);
 333
 334     return updateSize(pb, pos);
 335 }
 336
 337 static int gxf_write_map_packet(AVFormatContext *s, int rewrite)
 338 {
 339     GXFContext *gxf = s->priv_data;
 340     AVIOContext *pb = s->pb;
 341     int64_t pos = avio_tell(pb);
 342
 343     if (!rewrite) {
 344         if (!(gxf->map_offsets_nb % 30)) {
 345             gxf->map_offsets = av_realloc(gxf->map_offsets,
 346                                           (gxf->map_offsets_nb+30)*sizeof(*gxf->map_offsets));
 347             if (!gxf->map_offsets) {
 348                 av_log(s, AV_LOG_ERROR, "could not realloc map offsets\n");
 349                 return -1;
 350             }
 351         }
 352         gxf->map_offsets[gxf->map_offsets_nb++] = pos; // do not increment here
 353     }
 354
 355     gxf_write_packet_header(pb, PKT_MAP);
 356
 357     /* preamble */
 358     avio_w8(pb, 0xE0); /* version */
 359     avio_w8(pb, 0xFF); /* reserved */
 360
 361     gxf_write_material_data_section(s);
 362     gxf_write_track_description_section(s);
 363
 364     return updatePacketSize(pb, pos);
 365 }
 366
 367 static int gxf_write_flt_packet(AVFormatContext *s)
 368 {
 369     GXFContext *gxf = s->priv_data;
 370     AVIOContext *pb = s->pb;
 371     int64_t pos = avio_tell(pb);
 372     int fields_per_flt = (gxf->nb_fields+1) / 1000 + 1;
 373     int flt_entries = gxf->nb_fields / fields_per_flt;
 374     int i = 0;
 375
 376     gxf_write_packet_header(pb, PKT_FLT);
 377
 378     avio_wl32(pb, fields_per_flt); /* number of fields */
 379     avio_wl32(pb, flt_entries); /* number of active flt entries */
 380
 381     if (gxf->flt_entries) {
 382         for (i = 0; i < flt_entries; i++)
 383             avio_wl32(pb, gxf->flt_entries[(i*fields_per_flt)>>1]);
 384     }
 385
 386     for (; i < 1000; i++)
 387         avio_wl32(pb, 0);
 388
 389     return updatePacketSize(pb, pos);
 390 }
 391
 392 static int gxf_write_umf_material_description(AVFormatContext *s)
 393 {
 394     GXFContext *gxf = s->priv_data;
 395     AVIOContext *pb = s->pb;
 396     int timecode_base = gxf->time_base.den == 60000 ? 60 : 50;
 397     int64_t timestamp = 0;
 398     AVDictionaryEntry *t;
 399     uint32_t timecode;
 400
 401     if (t = av_dict_get(s->metadata, "creation_time", NULL, 0))
 402         timestamp = ff_iso8601_to_unix_time(t->value);
 403
 404     // XXX drop frame
 405     timecode =
 406         gxf->nb_fields / (timecode_base * 3600) % 24 << 24 | // hours
 407         gxf->nb_fields / (timecode_base * 60) % 60   << 16 | // minutes
 408         gxf->nb_fields /  timecode_base % 60         <<  8 | // seconds
 409         gxf->nb_fields %  timecode_base;                     // fields
 410
 411     avio_wl32(pb, gxf->flags);
 412     avio_wl32(pb, gxf->nb_fields); /* length of the longest track */
 413     avio_wl32(pb, gxf->nb_fields); /* length of the shortest track */
 414     avio_wl32(pb, 0); /* mark in */
 415     avio_wl32(pb, gxf->nb_fields); /* mark out */
 416     avio_wl32(pb, 0); /* timecode mark in */
 417     avio_wl32(pb, timecode); /* timecode mark out */
 418     avio_wl64(pb, timestamp); /* modification time */
 419     avio_wl64(pb, timestamp); /* creation time */
 420     avio_wl16(pb, 0); /* reserved */
 421     avio_wl16(pb, 0); /* reserved */
 422     avio_wl16(pb, gxf->audio_tracks);
 423     avio_wl16(pb, 1); /* timecode track count */
 424     avio_wl16(pb, 0); /* reserved */
 425     avio_wl16(pb, gxf->mpeg_tracks);
 426     return 48;
 427 }
 428
 429 static int gxf_write_umf_payload(AVFormatContext *s)
 430 {
 431     GXFContext *gxf = s->priv_data;
 432     AVIOContext *pb = s->pb;
 433
 434     avio_wl32(pb, gxf->umf_length); /* total length of the umf data */
 435     avio_wl32(pb, 3); /* version */
 436     avio_wl32(pb, s->nb_streams+1);
 437     avio_wl32(pb, gxf->umf_track_offset); /* umf track section offset */
 438     avio_wl32(pb, gxf->umf_track_size);
 439     avio_wl32(pb, s->nb_streams+1);
 440     avio_wl32(pb, gxf->umf_media_offset);
 441     avio_wl32(pb, gxf->umf_media_size);
 442     avio_wl32(pb, gxf->umf_length); /* user data offset */
 443     avio_wl32(pb, 0); /* user data size */
 444     avio_wl32(pb, 0); /* reserved */
 445     avio_wl32(pb, 0); /* reserved */
 446     return 48;
 447 }
 448
 449 static int gxf_write_umf_track_description(AVFormatContext *s)
 450 {
 451     AVIOContext *pb = s->pb;
 452     GXFContext *gxf = s->priv_data;
 453     int64_t pos = avio_tell(pb);
 454     int i;
 455
 456     gxf->umf_track_offset = pos - gxf->umf_start_offset;
 457     for (i = 0; i < s->nb_streams; ++i) {
 458         GXFStreamContext *sc = s->streams[i]->priv_data;
 459         avio_wl16(pb, sc->media_info);
 460         avio_wl16(pb, 1);
 461     }
 462
 463     avio_wl16(pb, gxf->timecode_track.media_info);
 464     avio_wl16(pb, 1);
 465
 466     return avio_tell(pb) - pos;
 467 }
 468
 469 static int gxf_write_umf_media_mpeg(AVIOContext *pb, AVStream *st)
 470 {
 471     GXFStreamContext *sc = st->priv_data;
 472
 473     if (st->codec->pix_fmt == AV_PIX_FMT_YUV422P)
 474         avio_wl32(pb, 2);
 475     else
 476         avio_wl32(pb, 1); /* default to 420 */
 477     avio_wl32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
 478     avio_wl32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
 479     avio_wl32(pb, 1); /* I picture per GOP */
 480     avio_wl32(pb, sc->p_per_gop);
 481     avio_wl32(pb, sc->b_per_i_or_p);
 482     if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
 483         avio_wl32(pb, 2);
 484     else if (st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 485         avio_wl32(pb, 1);
 486     else
 487         avio_wl32(pb, 0);
 488     avio_wl32(pb, 0); /* reserved */
 489     return 32;
 490 }
 491
 492 static int gxf_write_umf_media_timecode(AVIOContext *pb, GXFStreamContext *sc)
 493 {
 494     avio_wl32(pb, 1); /* non drop frame */
 495     avio_wl32(pb, 0); /* reserved */
 496     avio_wl32(pb, 0); /* reserved */
 497     avio_wl32(pb, 0); /* reserved */
 498     avio_wl32(pb, 0); /* reserved */
 499     avio_wl32(pb, 0); /* reserved */
 500     avio_wl32(pb, 0); /* reserved */
 501     avio_wl32(pb, 0); /* reserved */
 502     return 32;
 503 }
 504
 505 static int gxf_write_umf_media_dv(AVIOContext *pb, GXFStreamContext *sc)
 506 {
 507     int i;
 508
 509     for (i = 0; i < 8; i++) {
 510         avio_wb32(pb, 0);
 511     }
 512     return 32;
 513 }
 514
 515 static int gxf_write_umf_media_audio(AVIOContext *pb, GXFStreamContext *sc)
 516 {
 517     avio_wl64(pb, av_double2int(1)); /* sound level to begin to */
 518     avio_wl64(pb, av_double2int(1)); /* sound level to begin to */
 519     avio_wl32(pb, 0); /* number of fields over which to ramp up sound level */
 520     avio_wl32(pb, 0); /* number of fields over which to ramp down sound level */
 521     avio_wl32(pb, 0); /* reserved */
 522     avio_wl32(pb, 0); /* reserved */
 523     return 32;
 524 }
 525
 526 static int gxf_write_umf_media_description(AVFormatContext *s)
 527 {
 528     GXFContext *gxf = s->priv_data;
 529     AVIOContext *pb = s->pb;
 530     int64_t pos;
 531     int i, j;
 532
 533     pos = avio_tell(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 = avio_tell(pb);
 545         avio_wl16(pb, 0); /* length */
 546         avio_wl16(pb, sc->media_info);
 547         avio_wl16(pb, 0); /* reserved */
 548         avio_wl16(pb, 0); /* reserved */
 549         avio_wl32(pb, gxf->nb_fields);
 550         avio_wl32(pb, 0); /* attributes rw, ro */
 551         avio_wl32(pb, 0); /* mark in */
 552         avio_wl32(pb, gxf->nb_fields); /* mark out */
 553         avio_write(pb, ES_NAME_PATTERN, strlen(ES_NAME_PATTERN));
 554         avio_wb16(pb, sc->media_info);
 555         for (j = strlen(ES_NAME_PATTERN)+2; j < 88; j++)
 556             avio_w8(pb, 0);
 557         avio_wl32(pb, sc->track_type);
 558         avio_wl32(pb, sc->sample_rate);
 559         avio_wl32(pb, sc->sample_size);
 560         avio_wl32(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 AV_CODEC_ID_MPEG1VIDEO:
 568             case AV_CODEC_ID_MPEG2VIDEO:
 569                 gxf_write_umf_media_mpeg(pb, st);
 570                 break;
 571             case AV_CODEC_ID_PCM_S16LE:
 572                 gxf_write_umf_media_audio(pb, sc);
 573                 break;
 574             case AV_CODEC_ID_DVVIDEO:
 575                 gxf_write_umf_media_dv(pb, sc);
 576                 break;
 577             }
 578         }
 579
 580         curpos = avio_tell(pb);
 581         avio_seek(pb, startpos, SEEK_SET);
 582         avio_wl16(pb, curpos - startpos);
 583         avio_seek(pb, curpos, SEEK_SET);
 584     }
 585     return avio_tell(pb) - pos;
 586 }
 587
 588 static int gxf_write_umf_packet(AVFormatContext *s)
 589 {
 590     GXFContext *gxf = s->priv_data;
 591     AVIOContext *pb = s->pb;
 592     int64_t pos = avio_tell(pb);
 593
 594     gxf_write_packet_header(pb, PKT_UMF);
 595
 596     /* preamble */
 597     avio_w8(pb, 3); /* first and last (only) packet */
 598     avio_wb32(pb, gxf->umf_length); /* data length */
 599
 600     gxf->umf_start_offset = avio_tell(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 = avio_tell(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     AVIOContext *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 (!pb->seekable) {
 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 = ff_codec_get_tag(gxf_media_types, st->codec->codec_id);
 648         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
 649             if (st->codec->codec_id != AV_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             avpriv_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 == AVMEDIA_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 if (st->codec->height == 576 || st->codec->height == 608) { /* PAL or PAL+VBI */
 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             } else {
 689                 av_log(s, AV_LOG_ERROR, "unsupported video resolution, "
 690                        "gxf muxer only accepts PAL or NTSC resolutions currently\n");
 691                 return -1;
 692             }
 693             avpriv_set_pts_info(st, 64, gxf->time_base.num, gxf->time_base.den);
 694             if (gxf_find_lines_index(st) < 0)
 695                 sc->lines_index = -1;
 696             sc->sample_size = st->codec->bit_rate;
 697             sc->fields = 2; /* interlaced */
 698
 699             vsc = sc;
 700
 701             switch (st->codec->codec_id) {
 702             case AV_CODEC_ID_MJPEG:
 703                 sc->track_type = 1;
 704                 gxf->flags |= 0x00004000;
 705                 media_info = 'J';
 706                 break;
 707             case AV_CODEC_ID_MPEG1VIDEO:
 708                 sc->track_type = 9;
 709                 gxf->mpeg_tracks++;
 710                 media_info = 'L';
 711                 break;
 712             case AV_CODEC_ID_MPEG2VIDEO:
 713                 sc->first_gop_closed = -1;
 714                 sc->track_type = 4;
 715                 gxf->mpeg_tracks++;
 716                 gxf->flags |= 0x00008000;
 717                 media_info = 'M';
 718                 break;
 719             case AV_CODEC_ID_DVVIDEO:
 720                 if (st->codec->pix_fmt == AV_PIX_FMT_YUV422P) {
 721                     sc->media_type += 2;
 722                     sc->track_type = 6;
 723                     gxf->flags |= 0x00002000;
 724                     media_info = 'E';
 725                 } else {
 726                     sc->track_type = 5;
 727                     gxf->flags |= 0x00001000;
 728                     media_info = 'D';
 729                 }
 730                 break;
 731             default:
 732                 av_log(s, AV_LOG_ERROR, "video codec not supported\n");
 733                 return -1;
 734             }
 735         }
 736         /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
 737         sc->media_info = media_info<<8 | ('0'+tracks[media_info]++);
 738         sc->order = s->nb_streams - st->index;
 739     }
 740
 741     if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0)
 742         return -1;
 743
 744     gxf_init_timecode_track(&gxf->timecode_track, vsc);
 745     gxf->flags |= 0x200000; // time code track is non-drop frame
 746
 747     gxf_write_map_packet(s, 0);
 748     gxf_write_flt_packet(s);
 749     gxf_write_umf_packet(s);
 750
 751     gxf->packet_count = 3;
 752
 753     avio_flush(pb);
 754     return 0;
 755 }
 756
 757 static int gxf_write_eos_packet(AVIOContext *pb)
 758 {
 759     int64_t pos = avio_tell(pb);
 760
 761     gxf_write_packet_header(pb, PKT_EOS);
 762     return updatePacketSize(pb, pos);
 763 }
 764
 765 static int gxf_write_trailer(AVFormatContext *s)
 766 {
 767     GXFContext *gxf = s->priv_data;
 768     AVIOContext *pb = s->pb;
 769     int64_t end;
 770     int i;
 771
 772     ff_audio_interleave_close(s);
 773
 774     gxf_write_eos_packet(pb);
 775     end = avio_tell(pb);
 776     avio_seek(pb, 0, SEEK_SET);
 777     /* overwrite map, flt and umf packets with new values */
 778     gxf_write_map_packet(s, 1);
 779     gxf_write_flt_packet(s);
 780     gxf_write_umf_packet(s);
 781     avio_flush(pb);
 782     /* update duration in all map packets */
 783     for (i = 1; i < gxf->map_offsets_nb; i++) {
 784         avio_seek(pb, gxf->map_offsets[i], SEEK_SET);
 785         gxf_write_map_packet(s, 1);
 786         avio_flush(pb);
 787     }
 788
 789     avio_seek(pb, end, SEEK_SET);
 790
 791     av_freep(&gxf->flt_entries);
 792     av_freep(&gxf->map_offsets);
 793
 794     return 0;
 795 }
 796
 797 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
 798 {
 799     uint32_t c=-1;
 800     int i;
 801     for(i=0; i<size-4 && c!=0x100; i++){
 802         c = (c<<8) + buf[i];
 803         if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
 804             sc->first_gop_closed= (buf[i+4]>>6)&1;
 805     }
 806     return (buf[i+1]>>3)&7;
 807 }
 808
 809 static int gxf_write_media_preamble(AVFormatContext *s, AVPacket *pkt, int size)
 810 {
 811     GXFContext *gxf = s->priv_data;
 812     AVIOContext *pb = s->pb;
 813     AVStream *st = s->streams[pkt->stream_index];
 814     GXFStreamContext *sc = st->priv_data;
 815     unsigned field_nb;
 816     /* If the video is frame-encoded, the frame numbers shall be represented by
 817      * even field numbers.
 818      * see SMPTE360M-2004  6.4.2.1.3 Media field number */
 819     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 820         field_nb = gxf->nb_fields;
 821     } else {
 822         field_nb = av_rescale_rnd(pkt->dts, gxf->time_base.den,
 823                                   (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
 824     }
 825
 826     avio_w8(pb, sc->media_type);
 827     avio_w8(pb, st->index);
 828     avio_wb32(pb, field_nb);
 829     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
 830         avio_wb16(pb, 0);
 831         avio_wb16(pb, size / 2);
 832     } else if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 833         int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
 834         if (frame_type == AV_PICTURE_TYPE_I) {
 835             avio_w8(pb, 0x0d);
 836             sc->iframes++;
 837         } else if (frame_type == AV_PICTURE_TYPE_B) {
 838             avio_w8(pb, 0x0f);
 839             sc->bframes++;
 840         } else {
 841             avio_w8(pb, 0x0e);
 842             sc->pframes++;
 843         }
 844         avio_wb24(pb, size);
 845     } else if (st->codec->codec_id == AV_CODEC_ID_DVVIDEO) {
 846         avio_w8(pb, size / 4096);
 847         avio_wb24(pb, 0);
 848     } else
 849         avio_wb32(pb, size);
 850     avio_wb32(pb, field_nb);
 851     avio_w8(pb, 1); /* flags */
 852     avio_w8(pb, 0); /* reserved */
 853     return 16;
 854 }
 855
 856 static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
 857 {
 858     GXFContext *gxf = s->priv_data;
 859     AVIOContext *pb = s->pb;
 860     AVStream *st = s->streams[pkt->stream_index];
 861     int64_t pos = avio_tell(pb);
 862     int padding = 0;
 863     int packet_start_offset = avio_tell(pb) / 1024;
 864
 865     gxf_write_packet_header(pb, PKT_MEDIA);
 866     if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
 867         padding = 4 - pkt->size % 4;
 868     else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
 869         padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
 870     gxf_write_media_preamble(s, pkt, pkt->size + padding);
 871     avio_write(pb, pkt->data, pkt->size);
 872     gxf_write_padding(pb, padding);
 873
 874     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 875         if (!(gxf->flt_entries_nb % 500)) {
 876             gxf->flt_entries = av_realloc(gxf->flt_entries,
 877                                           (gxf->flt_entries_nb+500)*sizeof(*gxf->flt_entries));
 878             if (!gxf->flt_entries) {
 879                 av_log(s, AV_LOG_ERROR, "could not reallocate flt entries\n");
 880                 return -1;
 881             }
 882         }
 883         gxf->flt_entries[gxf->flt_entries_nb++] = packet_start_offset;
 884         gxf->nb_fields += 2; // count fields
 885     }
 886
 887     updatePacketSize(pb, pos);
 888
 889     gxf->packet_count++;
 890     if (gxf->packet_count == 100) {
 891         gxf_write_map_packet(s, 0);
 892         gxf->packet_count = 0;
 893     }
 894
 895     avio_flush(pb);
 896
 897     return 0;
 898 }
 899
 900 static int gxf_compare_field_nb(AVFormatContext *s, AVPacket *next, AVPacket *cur)
 901 {
 902     GXFContext *gxf = s->priv_data;
 903     AVPacket *pkt[2] = { cur, next };
 904     int i, field_nb[2];
 905     GXFStreamContext *sc[2];
 906
 907     for (i = 0; i < 2; i++) {
 908         AVStream *st = s->streams[pkt[i]->stream_index];
 909         sc[i] = st->priv_data;
 910         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
 911             field_nb[i] = av_rescale_rnd(pkt[i]->dts, gxf->time_base.den,
 912                                          (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
 913             field_nb[i] &= ~1; // compare against even field number because audio must be before video
 914         } else
 915             field_nb[i] = pkt[i]->dts; // dts are field based
 916     }
 917
 918     return field_nb[1] > field_nb[0] ||
 919         (field_nb[1] == field_nb[0] && sc[1]->order > sc[0]->order);
 920 }
 921
 922 static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
 923 {
 924     if (pkt && s->streams[pkt->stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
 925         pkt->duration = 2; // enforce 2 fields
 926     return ff_audio_rechunk_interleave(s, out, pkt, flush,
 927                                ff_interleave_packet_per_dts, gxf_compare_field_nb);
 928 }
 929
 930 AVOutputFormat ff_gxf_muxer = {
 931     .name              = "gxf",
 932     .long_name         = NULL_IF_CONFIG_SMALL("GXF (General eXchange Format)"),
 933     .extensions        = "gxf",
 934     .priv_data_size    = sizeof(GXFContext),
 935     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
 936     .video_codec       = AV_CODEC_ID_MPEG2VIDEO,
 937     .write_header      = gxf_write_header,
 938     .write_packet      = gxf_write_packet,
 939     .write_trailer     = gxf_write_trailer,
 940     .interleave_packet = gxf_interleave_packet,
 941 };