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     AVCodecContext *codec;
  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     uint8_t index;
  39     int frame_rate_index;
  40     int lines_index;
  41     int fields;
  42     int iframes;
  43     int pframes;
  44     int bframes;
  45     int p_per_gop;
  46     int b_per_i_or_p; ///< number of B frames per I frame or P frame
  47     int first_gop_closed;
  48     int64_t current_dts;
  49     int dts_delay;
  50 } GXFStreamContext;
  51
  52 typedef struct GXFContext {
  53     uint32_t nb_fields;
  54     uint32_t material_flags;
  55     uint16_t audio_tracks;
  56     uint16_t mpeg_tracks;
  57     int64_t creation_time;
  58     uint32_t umf_start_offset;
  59     uint32_t umf_track_offset;
  60     uint32_t umf_media_offset;
  61     uint32_t umf_user_data_offset;
  62     uint32_t umf_user_data_size;
  63     uint32_t umf_length;
  64     uint16_t umf_track_size;
  65     uint16_t umf_media_size;
  66     int audio_written;
  67     int sample_rate;
  68     int flags;
  69     AVFormatContext *fc;
  70 } GXFContext;
  71
  72 typedef struct GXF_Lines {
  73     int height;
  74     int index;
  75 } GXF_Lines;
  76
  77
  78 /* FIXME check if it is relevant */
  79 static const GXF_Lines gxf_lines_tab[] = {
  80     { 480,  1 }, /* NTSC */
  81     { 512,  1 }, /* NTSC + VBI */
  82     { 576,  2 }, /* PAL */
  83     { 608,  2 }, /* PAL + VBI */
  84     { 1080, 4 },
  85     { 720,  6 },
  86 };
  87
  88 static const AVCodecTag gxf_media_types[] = {
  89     { CODEC_ID_MJPEG     ,   3 }, /* NTSC */
  90     { CODEC_ID_MJPEG     ,   4 }, /* PAL */
  91     { CODEC_ID_PCM_S24LE ,   9 },
  92     { CODEC_ID_PCM_S16LE ,  10 },
  93     { CODEC_ID_MPEG2VIDEO,  11 }, /* NTSC */
  94     { CODEC_ID_MPEG2VIDEO,  12 }, /* PAL */
  95     { CODEC_ID_DVVIDEO   ,  13 }, /* NTSC */
  96     { CODEC_ID_DVVIDEO   ,  14 }, /* PAL */
  97     { CODEC_ID_DVVIDEO   ,  15 }, /* 50M NTSC */
  98     { CODEC_ID_DVVIDEO   ,  16 }, /* 50M PAL */
  99     { CODEC_ID_AC3       ,  17 },
 100     //{ CODEC_ID_NONE,  ,   18 }, /* Non compressed 24 bit audio */
 101     { CODEC_ID_MPEG2VIDEO,  20 }, /* MPEG HD */
 102     { CODEC_ID_MPEG1VIDEO,  22 }, /* NTSC */
 103     { CODEC_ID_MPEG1VIDEO,  23 }, /* PAL */
 104     { 0, 0 },
 105 };
 106
 107 #define SERVER_PATH "/space/"
 108 #define ES_NAME_PATTERN "ES."
 109
 110 static int gxf_find_lines_index(GXFStreamContext *ctx)
 111 {
 112     int i;
 113
 114     for (i = 0; i < 6; ++i) {
 115         if (ctx->codec->height == gxf_lines_tab[i].height) {
 116             ctx->lines_index = gxf_lines_tab[i].index;
 117             return 0;
 118         }
 119     }
 120     return -1;
 121 }
 122
 123 static void gxf_write_padding(ByteIOContext *pb, int64_t to_pad)
 124 {
 125     for (; to_pad > 0; to_pad--) {
 126         put_byte(pb, 0);
 127     }
 128 }
 129
 130 static int64_t updatePacketSize(ByteIOContext *pb, int64_t pos)
 131 {
 132     int64_t curpos;
 133     int size;
 134
 135     size = url_ftell(pb) - pos;
 136     if (size % 4) {
 137         gxf_write_padding(pb, 4 - size % 4);
 138         size = url_ftell(pb) - pos;
 139     }
 140     curpos = url_ftell(pb);
 141     url_fseek(pb, pos + 6, SEEK_SET);
 142     put_be32(pb, size);
 143     url_fseek(pb, curpos, SEEK_SET);
 144     return curpos - pos;
 145 }
 146
 147 static int64_t updateSize(ByteIOContext *pb, int64_t pos)
 148 {
 149     int64_t curpos;
 150
 151     curpos = url_ftell(pb);
 152     url_fseek(pb, pos, SEEK_SET);
 153     put_be16(pb, curpos - pos - 2);
 154     url_fseek(pb, curpos, SEEK_SET);
 155     return curpos - pos;
 156 }
 157
 158 static void gxf_write_packet_header(ByteIOContext *pb, GXFPktType type)
 159 {
 160     put_be32(pb, 0); /* packet leader for synchro */
 161     put_byte(pb, 1);
 162     put_byte(pb, type); /* map packet */
 163     put_be32(pb, 0); /* size */
 164     put_be32(pb, 0); /* reserved */
 165     put_byte(pb, 0xE1); /* trailer 1 */
 166     put_byte(pb, 0xE2); /* trailer 2 */
 167 }
 168
 169 static int gxf_write_mpeg_auxiliary(ByteIOContext *pb, GXFStreamContext *ctx)
 170 {
 171     char buffer[1024];
 172     int size, starting_line;
 173
 174     if (ctx->iframes) {
 175         ctx->p_per_gop = ctx->pframes / ctx->iframes;
 176         if (ctx->pframes % ctx->iframes)
 177             ctx->p_per_gop++;
 178         if (ctx->pframes) {
 179             ctx->b_per_i_or_p = ctx->bframes / ctx->pframes;
 180             if (ctx->bframes % ctx->pframes)
 181                 ctx->b_per_i_or_p++;
 182         }
 183         if (ctx->p_per_gop > 9)
 184             ctx->p_per_gop = 9; /* ensure value won't take more than one char */
 185         if (ctx->b_per_i_or_p > 9)
 186             ctx->b_per_i_or_p = 9; /* ensure value won't take more than one char */
 187     }
 188     if (ctx->codec->height == 512 || ctx->codec->height == 608)
 189         starting_line = 7; // VBI
 190     else if (ctx->codec->height == 480)
 191         starting_line = 20;
 192     else
 193         starting_line = 23; // default PAL
 194
 195     size = snprintf(buffer, 1024, "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n"
 196                     "Pix 0\nCf %d\nCg %d\nSl %d\nnl16 %d\nVi 1\nf1 1\n",
 197                     (float)ctx->codec->bit_rate, ctx->p_per_gop, ctx->b_per_i_or_p,
 198                     ctx->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1, ctx->first_gop_closed == 1,
 199                     starting_line, ctx->codec->height / 16);
 200     put_byte(pb, TRACK_MPG_AUX);
 201     put_byte(pb, size + 1);
 202     put_buffer(pb, (uint8_t *)buffer, size + 1);
 203     return size + 3;
 204 }
 205
 206 static int gxf_write_timecode_auxiliary(ByteIOContext *pb, GXFStreamContext *ctx)
 207 {
 208     /* FIXME implement that */
 209     put_byte(pb, 0); /* fields */
 210     put_byte(pb, 0);  /* seconds */
 211     put_byte(pb, 0); /* minutes */
 212     put_byte(pb, 0); /* flags + hours */
 213     /* reserved */
 214     put_be32(pb, 0);
 215     return 8;
 216 }
 217
 218 static int gxf_write_track_description(ByteIOContext *pb, GXFStreamContext *stream)
 219 {
 220     int64_t pos;
 221
 222     /* track description section */
 223     put_byte(pb, stream->media_type + 0x80);
 224     put_byte(pb, stream->index + 0xC0);
 225
 226     pos = url_ftell(pb);
 227     put_be16(pb, 0); /* size */
 228
 229     /* media file name */
 230     put_byte(pb, TRACK_NAME);
 231     put_byte(pb, strlen(ES_NAME_PATTERN) + 3);
 232     put_tag(pb, ES_NAME_PATTERN);
 233     put_be16(pb, stream->media_info);
 234     put_byte(pb, 0);
 235
 236     if (stream->codec->codec_id != CODEC_ID_MPEG2VIDEO) {
 237         /* auxiliary information */
 238         put_byte(pb, TRACK_AUX);
 239         put_byte(pb, 8);
 240         if (stream->codec->codec_id == CODEC_ID_NONE)
 241             gxf_write_timecode_auxiliary(pb, stream);
 242         else
 243             put_le64(pb, 0);
 244     }
 245
 246     /* file system version */
 247     put_byte(pb, TRACK_VER);
 248     put_byte(pb, 4);
 249     put_be32(pb, 0);
 250
 251     if (stream->codec->codec_id == CODEC_ID_MPEG2VIDEO)
 252         gxf_write_mpeg_auxiliary(pb, stream);
 253
 254     /* frame rate */
 255     put_byte(pb, TRACK_FPS);
 256     put_byte(pb, 4);
 257     put_be32(pb, stream->frame_rate_index);
 258
 259     /* lines per frame */
 260     put_byte(pb, TRACK_LINES);
 261     put_byte(pb, 4);
 262     put_be32(pb, stream->lines_index);
 263
 264     /* fields per frame */
 265     put_byte(pb, TRACK_FPF);
 266     put_byte(pb, 4);
 267     put_be32(pb, stream->fields);
 268
 269     return updateSize(pb, pos);
 270 }
 271
 272 static int gxf_write_material_data_section(ByteIOContext *pb, GXFContext *ctx)
 273 {
 274     int64_t pos;
 275     const char *filename = strrchr(ctx->fc->filename, '/');
 276
 277     pos = url_ftell(pb);
 278     put_be16(pb, 0); /* size */
 279
 280     /* name */
 281     if (filename)
 282         filename++;
 283     else
 284         filename = ctx->fc->filename;
 285     put_byte(pb, MAT_NAME);
 286     put_byte(pb, strlen(SERVER_PATH) + strlen(filename) + 1);
 287     put_tag(pb, SERVER_PATH);
 288     put_tag(pb, filename);
 289     put_byte(pb, 0);
 290
 291     /* first field */
 292     put_byte(pb, MAT_FIRST_FIELD);
 293     put_byte(pb, 4);
 294     put_be32(pb, 0);
 295
 296     /* last field */
 297     put_byte(pb, MAT_LAST_FIELD);
 298     put_byte(pb, 4);
 299     put_be32(pb, ctx->nb_fields);
 300
 301     /* reserved */
 302     put_byte(pb, MAT_MARK_IN);
 303     put_byte(pb, 4);
 304     put_be32(pb, 0);
 305
 306     put_byte(pb, MAT_MARK_OUT);
 307     put_byte(pb, 4);
 308     put_be32(pb, ctx->nb_fields);
 309
 310     /* estimated size */
 311     put_byte(pb, MAT_SIZE);
 312     put_byte(pb, 4);
 313     put_be32(pb, url_fsize(pb) / 1024);
 314
 315     return updateSize(pb, pos);
 316 }
 317
 318 static int gxf_write_track_description_section(ByteIOContext *pb, GXFContext *ctx)
 319 {
 320     int64_t pos;
 321     int i;
 322
 323     pos = url_ftell(pb);
 324     put_be16(pb, 0); /* size */
 325     for (i = 0; i < ctx->fc->nb_streams; ++i)
 326         gxf_write_track_description(pb, ctx->fc->streams[i]->priv_data);
 327     return updateSize(pb, pos);
 328 }
 329
 330 static int gxf_write_map_packet(ByteIOContext *pb, GXFContext *ctx)
 331 {
 332     int64_t pos = url_ftell(pb);
 333
 334     gxf_write_packet_header(pb, PKT_MAP);
 335
 336     /* preamble */
 337     put_byte(pb, 0xE0); /* version */
 338     put_byte(pb, 0xFF); /* reserved */
 339
 340     gxf_write_material_data_section(pb, ctx);
 341     gxf_write_track_description_section(pb, ctx);
 342
 343     return updatePacketSize(pb, pos);
 344 }
 345
 346 #if 0
 347 static int gxf_write_flt_packet(ByteIOContext *pb, GXFContext *ctx)
 348 {
 349     int64_t pos = url_ftell(pb);
 350     int i;
 351
 352     gxf_write_packet_header(pb, PKT_FLT);
 353
 354     put_le32(pb, 1000); /* number of fields */
 355     put_le32(pb, 0); /* number of active flt entries */
 356
 357     for (i = 0; i < 1000; ++i) {
 358         put_le32(pb, 0);
 359     }
 360     return updatePacketSize(pb, pos);
 361 }
 362 #endif
 363
 364 static int gxf_write_umf_material_description(ByteIOContext *pb, GXFContext *ctx)
 365 {
 366     // XXX drop frame
 367     uint32_t timecode =
 368         ctx->nb_fields / (ctx->sample_rate * 3600) % 24 << 24 | // hours
 369         ctx->nb_fields / (ctx->sample_rate * 60) % 60   << 16 | // minutes
 370         ctx->nb_fields / ctx->sample_rate % 60          <<  8 | // seconds
 371         ctx->nb_fields % ctx->sample_rate;                    // fields
 372
 373     put_le32(pb, ctx->flags);
 374     put_le32(pb, ctx->nb_fields); /* length of the longest track */
 375     put_le32(pb, ctx->nb_fields); /* length of the shortest track */
 376     put_le32(pb, 0); /* mark in */
 377     put_le32(pb, ctx->nb_fields); /* mark out */
 378     put_le32(pb, 0); /* timecode mark in */
 379     put_le32(pb, timecode); /* timecode mark out */
 380     put_le64(pb, ctx->fc->timestamp); /* modification time */
 381     put_le64(pb, ctx->fc->timestamp); /* creation time */
 382     put_le16(pb, 0); /* reserved */
 383     put_le16(pb, 0); /* reserved */
 384     put_le16(pb, ctx->audio_tracks);
 385     put_le16(pb, 0); /* timecode track count */
 386     put_le16(pb, 0); /* reserved */
 387     put_le16(pb, ctx->mpeg_tracks);
 388     return 48;
 389 }
 390
 391 static int gxf_write_umf_payload(ByteIOContext *pb, GXFContext *ctx)
 392 {
 393     put_le32(pb, ctx->umf_length); /* total length of the umf data */
 394     put_le32(pb, 3); /* version */
 395     put_le32(pb, ctx->fc->nb_streams);
 396     put_le32(pb, ctx->umf_track_offset); /* umf track section offset */
 397     put_le32(pb, ctx->umf_track_size);
 398     put_le32(pb, ctx->fc->nb_streams);
 399     put_le32(pb, ctx->umf_media_offset);
 400     put_le32(pb, ctx->umf_media_size);
 401     put_le32(pb, ctx->umf_user_data_offset); /* user data offset */
 402     put_le32(pb, ctx->umf_user_data_size); /* user data size */
 403     put_le32(pb, 0); /* reserved */
 404     put_le32(pb, 0); /* reserved */
 405     return 48;
 406 }
 407
 408 static int gxf_write_umf_track_description(ByteIOContext *pb, GXFContext *ctx)
 409 {
 410     int64_t pos = url_ftell(pb);
 411     int tracks[255]={0};
 412     int i;
 413
 414     ctx->umf_track_offset = pos - ctx->umf_start_offset;
 415     for (i = 0; i < ctx->fc->nb_streams; ++i) {
 416         AVStream *st = ctx->fc->streams[i];
 417         GXFStreamContext *sc = st->priv_data;
 418         int id = 0;
 419
 420         switch (st->codec->codec_id) {
 421         case CODEC_ID_MPEG1VIDEO: id= 'L'; break;
 422         case CODEC_ID_MPEG2VIDEO: id= 'M'; break;
 423         case CODEC_ID_PCM_S16LE:  id= 'A'; break;
 424         case CODEC_ID_DVVIDEO:    id= sc->track_type == 6 ? 'E' : 'D'; break;
 425         case CODEC_ID_MJPEG:      id= 'V'; break;
 426         default:                  break;
 427         }
 428         sc->media_info= id << 8;
 429         /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
 430         sc->media_info |= '0' + (tracks[id]++);
 431         put_le16(pb, sc->media_info);
 432         put_le16(pb, 1);
 433     }
 434     return url_ftell(pb) - pos;
 435 }
 436
 437 static int gxf_write_umf_media_mpeg(ByteIOContext *pb, GXFStreamContext *stream)
 438 {
 439     if (stream->codec->pix_fmt == PIX_FMT_YUV422P)
 440         put_le32(pb, 2);
 441     else
 442         put_le32(pb, 1); /* default to 420 */
 443     put_le32(pb, stream->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
 444     put_le32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
 445     put_le32(pb, 1); /* I picture per GOP */
 446     put_le32(pb, stream->p_per_gop);
 447     put_le32(pb, stream->b_per_i_or_p);
 448     if (stream->codec->codec_id == CODEC_ID_MPEG2VIDEO)
 449         put_le32(pb, 2);
 450     else if (stream->codec->codec_id == CODEC_ID_MPEG1VIDEO)
 451         put_le32(pb, 1);
 452     else
 453         put_le32(pb, 0);
 454     put_le32(pb, 0); /* reserved */
 455     return 32;
 456 }
 457
 458 static int gxf_write_umf_media_timecode(ByteIOContext *pb, GXFStreamContext *track)
 459 {
 460     /* FIXME implement */
 461     put_be32(pb, 0); /* drop frame flag */
 462     put_be32(pb, 0); /* reserved */
 463     put_be32(pb, 0); /* reserved */
 464     put_be32(pb, 0); /* reserved */
 465     put_be32(pb, 0); /* reserved */
 466     put_be32(pb, 0); /* reserved */
 467     put_be32(pb, 0); /* reserved */
 468     put_be32(pb, 0); /* reserved */
 469     return 32;
 470 }
 471
 472 static int gxf_write_umf_media_dv(ByteIOContext *pb, GXFStreamContext *track)
 473 {
 474     int i;
 475
 476     for (i = 0; i < 8; i++) {
 477         put_be32(pb, 0);
 478     }
 479     return 32;
 480 }
 481
 482 static int gxf_write_umf_media_audio(ByteIOContext *pb, GXFStreamContext *track)
 483 {
 484     put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
 485     put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
 486     put_le32(pb, 0); /* number of fields over which to ramp up sound level */
 487     put_le32(pb, 0); /* number of fields over which to ramp down sound level */
 488     put_le32(pb, 0); /* reserved */
 489     put_le32(pb, 0); /* reserved */
 490     return 32;
 491 }
 492
 493 #if 0
 494 static int gxf_write_umf_media_mjpeg(ByteIOContext *pb, GXFStreamContext *track)
 495 {
 496     put_be64(pb, 0); /* FIXME FLOAT max chroma quant level */
 497     put_be64(pb, 0); /* FIXME FLOAT max luma quant level */
 498     put_be64(pb, 0); /* FIXME FLOAT min chroma quant level */
 499     put_be64(pb, 0); /* FIXME FLOAT min luma quant level */
 500     return 32;
 501 }
 502 #endif
 503
 504 static int gxf_write_umf_media_description(ByteIOContext *pb, GXFContext *ctx)
 505 {
 506     int64_t pos;
 507     int i;
 508
 509     pos = url_ftell(pb);
 510     ctx->umf_media_offset = pos - ctx->umf_start_offset;
 511     for (i = 0; i < ctx->fc->nb_streams; ++i) {
 512         GXFStreamContext *sc = ctx->fc->streams[i]->priv_data;
 513         char buffer[88];
 514         int64_t startpos, curpos;
 515         int path_size = strlen(ES_NAME_PATTERN);
 516
 517         memset(buffer, 0, 88);
 518         startpos = url_ftell(pb);
 519         put_le16(pb, 0); /* length */
 520         put_le16(pb, sc->media_info);
 521         put_le16(pb, 0); /* reserved */
 522         put_le16(pb, 0); /* reserved */
 523         put_le32(pb, ctx->nb_fields);
 524         put_le32(pb, 0); /* attributes rw, ro */
 525         put_le32(pb, 0); /* mark in */
 526         put_le32(pb, ctx->nb_fields); /* mark out */
 527         strncpy(buffer, ES_NAME_PATTERN, path_size);
 528         put_buffer(pb, (uint8_t *)buffer, path_size);
 529         put_be16(pb, sc->media_info);
 530         put_buffer(pb, (uint8_t *)buffer + path_size + 2, 88 - path_size - 2);
 531         put_le32(pb, sc->track_type);
 532         put_le32(pb, sc->sample_rate);
 533         put_le32(pb, sc->sample_size);
 534         put_le32(pb, 0); /* reserved */
 535         switch (sc->codec->codec_id) {
 536         case CODEC_ID_MPEG2VIDEO:
 537             gxf_write_umf_media_mpeg(pb, sc);
 538             break;
 539         case CODEC_ID_PCM_S16LE:
 540             gxf_write_umf_media_audio(pb, sc);
 541             break;
 542         case CODEC_ID_DVVIDEO:
 543             gxf_write_umf_media_dv(pb, sc);
 544             break;
 545         default:
 546             gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
 547         }
 548         curpos = url_ftell(pb);
 549         url_fseek(pb, startpos, SEEK_SET);
 550         put_le16(pb, curpos - startpos);
 551         url_fseek(pb, curpos, SEEK_SET);
 552     }
 553     return url_ftell(pb) - pos;
 554 }
 555
 556 static int gxf_write_umf_user_data(ByteIOContext *pb, GXFContext *ctx)
 557 {
 558     int64_t pos = url_ftell(pb);
 559     ctx->umf_user_data_offset = pos - ctx->umf_start_offset;
 560     put_le32(pb, 20);
 561     put_le32(pb,  0);
 562     put_le16(pb,  0);
 563     put_le16(pb,  0);
 564     put_le32(pb,  0);
 565     put_byte(pb,  0);
 566     put_byte(pb,  0);
 567     put_byte(pb,  0);
 568     put_byte(pb,  0);
 569     return 20;
 570 }
 571
 572 static int gxf_write_umf_packet(ByteIOContext *pb, GXFContext *ctx)
 573 {
 574     int64_t pos = url_ftell(pb);
 575
 576     gxf_write_packet_header(pb, PKT_UMF);
 577
 578     /* preamble */
 579     put_byte(pb, 3); /* first and last (only) packet */
 580     put_be32(pb, ctx->umf_length); /* data length */
 581
 582     ctx->umf_start_offset = url_ftell(pb);
 583     gxf_write_umf_payload(pb, ctx);
 584     gxf_write_umf_material_description(pb, ctx);
 585     ctx->umf_track_size = gxf_write_umf_track_description(pb, ctx);
 586     ctx->umf_media_size = gxf_write_umf_media_description(pb, ctx);
 587     ctx->umf_user_data_size = gxf_write_umf_user_data(pb, ctx);
 588     ctx->umf_length = url_ftell(pb) - ctx->umf_start_offset;
 589     return updatePacketSize(pb, pos);
 590 }
 591
 592 #define GXF_NODELAY -5000
 593
 594 static const int GXF_samples_per_frame[] = { 32768, 0 };
 595
 596 static int gxf_write_header(AVFormatContext *s)
 597 {
 598     ByteIOContext *pb = s->pb;
 599     GXFContext *gxf = s->priv_data;
 600     int i;
 601
 602     gxf->fc = s;
 603     gxf->flags |= 0x00080000; /* material is simple clip */
 604     for (i = 0; i < s->nb_streams; ++i) {
 605         AVStream *st = s->streams[i];
 606         GXFStreamContext *sc = av_mallocz(sizeof(*sc));
 607         if (!sc)
 608             return AVERROR(ENOMEM);
 609         st->priv_data = sc;
 610
 611         sc->codec = st->codec;
 612         sc->index = i;
 613         sc->media_type = codec_get_tag(gxf_media_types, sc->codec->codec_id);
 614         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 615             if (st->codec->codec_id != CODEC_ID_PCM_S16LE) {
 616                 av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
 617                 return -1;
 618             }
 619             if (st->codec->sample_rate != 48000) {
 620                 av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
 621                 return -1;
 622             }
 623             if (st->codec->channels != 1) {
 624                 av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
 625                 return -1;
 626             }
 627             sc->track_type = 2;
 628             sc->sample_rate = st->codec->sample_rate;
 629             av_set_pts_info(st, 64, 1, sc->sample_rate);
 630             sc->sample_size = 16;
 631             sc->frame_rate_index = -2;
 632             sc->lines_index = -2;
 633             sc->fields = -2;
 634             gxf->audio_tracks++;
 635             gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
 636         } else if (sc->codec->codec_type == CODEC_TYPE_VIDEO) {
 637             /* FIXME check from time_base ? */
 638             if (sc->codec->height == 480 || sc->codec->height == 512) { /* NTSC or NTSC+VBI */
 639                 sc->frame_rate_index = 5;
 640                 sc->sample_rate = 60;
 641                 gxf->flags |= 0x00000080;
 642             } else { /* assume PAL */
 643                 sc->frame_rate_index = 6;
 644                 sc->media_type++;
 645                 sc->sample_rate = 50;
 646                 gxf->flags |= 0x00000040;
 647             }
 648             gxf->sample_rate = sc->sample_rate;
 649             av_set_pts_info(st, 64, 1, st->codec->time_base.den);
 650             sc->dts_delay = GXF_NODELAY;
 651             if (gxf_find_lines_index(sc) < 0)
 652                 sc->lines_index = -1;
 653             sc->sample_size = st->codec->bit_rate;
 654             sc->fields = 2; /* interlaced */
 655             switch (sc->codec->codec_id) {
 656             case CODEC_ID_MPEG2VIDEO:
 657                 sc->first_gop_closed = -1;
 658                 sc->track_type = 4;
 659                 gxf->mpeg_tracks++;
 660                 gxf->flags |= 0x00008000;
 661                 break;
 662             case CODEC_ID_DVVIDEO:
 663                 if (sc->codec->pix_fmt == PIX_FMT_YUV422P) {
 664                     sc->media_type += 2;
 665                     sc->track_type = 6;
 666                     gxf->flags |= 0x00002000;
 667                 } else {
 668                     sc->track_type = 5;
 669                     gxf->flags |= 0x00001000;
 670                 }
 671                 break;
 672             default:
 673                 av_log(s, AV_LOG_ERROR, "video codec not supported\n");
 674                 return -1;
 675             }
 676         }
 677     }
 678
 679     if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0)
 680         return -1;
 681
 682     gxf_write_map_packet(pb, gxf);
 683     //gxf_write_flt_packet(pb, gxf);
 684     gxf_write_umf_packet(pb, gxf);
 685     put_flush_packet(pb);
 686     return 0;
 687 }
 688
 689 static int gxf_write_eos_packet(ByteIOContext *pb, GXFContext *ctx)
 690 {
 691     int64_t pos = url_ftell(pb);
 692
 693     gxf_write_packet_header(pb, PKT_EOS);
 694     return updatePacketSize(pb, pos);
 695 }
 696
 697 static int gxf_write_trailer(AVFormatContext *s)
 698 {
 699     ByteIOContext *pb = s->pb;
 700     GXFContext *gxf = s->priv_data;
 701     int64_t end;
 702
 703     ff_audio_interleave_close(s);
 704
 705     gxf_write_eos_packet(pb, gxf);
 706     end = url_ftell(pb);
 707     url_fseek(pb, 0, SEEK_SET);
 708     /* overwrite map and umf packets with new values */
 709     gxf_write_map_packet(pb, gxf);
 710     //gxf_write_flt_packet(pb, gxf);
 711     gxf_write_umf_packet(pb, gxf);
 712     url_fseek(pb, end, SEEK_SET);
 713     return 0;
 714 }
 715
 716 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
 717 {
 718     uint32_t c=-1;
 719     int i;
 720     for(i=0; i<size-4 && c!=0x100; i++){
 721         c = (c<<8) + buf[i];
 722         if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
 723             sc->first_gop_closed= (buf[i+4]>>6)&1;
 724     }
 725     return (buf[i+1]>>3)&7;
 726 }
 727
 728 static int gxf_write_media_preamble(ByteIOContext *pb, GXFContext *ctx, AVPacket *pkt, int size)
 729 {
 730     GXFStreamContext *sc = ctx->fc->streams[pkt->stream_index]->priv_data;
 731     unsigned field_nb;
 732     /* If the video is frame-encoded, the frame numbers shall be represented by
 733      * even field numbers.
 734      * see SMPTE360M-2004  6.4.2.1.3 Media field number */
 735     if (sc->codec->codec_type == CODEC_TYPE_VIDEO) {
 736         field_nb = ctx->nb_fields;
 737     } else {
 738         field_nb = av_rescale_rnd(pkt->dts, ctx->sample_rate, sc->codec->time_base.den, AV_ROUND_UP);
 739     }
 740
 741     put_byte(pb, sc->media_type);
 742     put_byte(pb, sc->index);
 743     put_be32(pb, field_nb);
 744     if (sc->codec->codec_type == CODEC_TYPE_AUDIO) {
 745         put_be16(pb, 0);
 746         put_be16(pb, size / 2);
 747     } else if (sc->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
 748         int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
 749         if (frame_type == FF_I_TYPE) {
 750             put_byte(pb, 0x0d);
 751             sc->iframes++;
 752         } else if (frame_type == FF_B_TYPE) {
 753             put_byte(pb, 0x0f);
 754             sc->bframes++;
 755         } else {
 756             put_byte(pb, 0x0e);
 757             sc->pframes++;
 758         }
 759         put_be24(pb, size);
 760     } else if (sc->codec->codec_id == CODEC_ID_DVVIDEO) {
 761         put_byte(pb, size / 4096);
 762         put_be24(pb, 0);
 763     } else
 764         put_be32(pb, size);
 765     put_be32(pb, field_nb);
 766     put_byte(pb, 1); /* flags */
 767     put_byte(pb, 0); /* reserved */
 768     return 16;
 769 }
 770
 771 static int gxf_write_media_packet(ByteIOContext *pb, GXFContext *ctx, AVPacket *pkt)
 772 {
 773     GXFStreamContext *sc = ctx->fc->streams[pkt->stream_index]->priv_data;
 774     int64_t pos = url_ftell(pb);
 775     int padding = 0;
 776
 777     gxf_write_packet_header(pb, PKT_MEDIA);
 778     if (sc->codec->codec_id == CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
 779         padding = 4 - pkt->size % 4;
 780     else if (sc->codec->codec_type == CODEC_TYPE_AUDIO)
 781         padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
 782     gxf_write_media_preamble(pb, ctx, pkt, pkt->size + padding);
 783     put_buffer(pb, pkt->data, pkt->size);
 784     gxf_write_padding(pb, padding);
 785
 786     if (sc->codec->codec_type == CODEC_TYPE_VIDEO)
 787         ctx->nb_fields += 2; // count fields
 788
 789     return updatePacketSize(pb, pos);
 790 }
 791
 792 static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
 793 {
 794     GXFContext *gxf = s->priv_data;
 795
 796     gxf_write_media_packet(s->pb, gxf, pkt);
 797     put_flush_packet(s->pb);
 798     return 0;
 799 }
 800
 801 static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
 802 {
 803     return ff_audio_rechunk_interleave(s, out, pkt, flush,
 804                                av_interleave_packet_per_dts, ff_interleave_compare_dts);
 805 }
 806
 807 AVOutputFormat gxf_muxer = {
 808     "gxf",
 809     NULL_IF_CONFIG_SMALL("GXF format"),
 810     NULL,
 811     "gxf",
 812     sizeof(GXFContext),
 813     CODEC_ID_PCM_S16LE,
 814     CODEC_ID_MPEG2VIDEO,
 815     gxf_write_header,
 816     gxf_write_packet,
 817     gxf_write_trailer,
 818     0,
 819     NULL,
 820     gxf_interleave_packet,
 821 };