gxfenc.c
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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 "riff.h"
28 #include "audiointerleave.h"
29 
30 #define GXF_AUDIO_PACKET_SIZE 65536
31 
32 typedef struct GXFStreamContext {
34  uint32_t track_type;
35  uint32_t sample_size;
36  uint32_t sample_rate;
37  uint16_t media_type;
38  uint16_t media_info;
41  int fields;
42  int iframes;
43  int pframes;
44  int bframes;
45  int p_per_gop;
48  unsigned order;
50 
51 typedef struct GXFContext {
52  uint32_t nb_fields;
53  uint16_t audio_tracks;
54  uint16_t mpeg_tracks;
55  int64_t creation_time;
56  uint32_t umf_start_offset;
57  uint32_t umf_track_offset;
58  uint32_t umf_media_offset;
59  uint32_t umf_length;
60  uint16_t umf_track_size;
61  uint16_t umf_media_size;
63  int flags;
65  unsigned *flt_entries;
66  unsigned flt_entries_nb;
67  uint64_t *map_offsets;
68  unsigned map_offsets_nb;
69  unsigned packet_count;
70 } GXFContext;
71 
72 static const struct {
73  int height, index;
74 } gxf_lines_tab[] = {
75  { 480, 1 }, /* NTSC */
76  { 512, 1 }, /* NTSC + VBI */
77  { 576, 2 }, /* PAL */
78  { 608, 2 }, /* PAL + VBI */
79  { 1080, 4 },
80  { 720, 6 },
81 };
82 
83 static const AVCodecTag gxf_media_types[] = {
84  { CODEC_ID_MJPEG , 3 }, /* NTSC */
85  { CODEC_ID_MJPEG , 4 }, /* PAL */
86  { CODEC_ID_PCM_S24LE , 9 },
87  { CODEC_ID_PCM_S16LE , 10 },
88  { CODEC_ID_MPEG2VIDEO, 11 }, /* NTSC */
89  { CODEC_ID_MPEG2VIDEO, 12 }, /* PAL */
90  { CODEC_ID_DVVIDEO , 13 }, /* NTSC */
91  { CODEC_ID_DVVIDEO , 14 }, /* PAL */
92  { CODEC_ID_DVVIDEO , 15 }, /* 50M NTSC */
93  { CODEC_ID_DVVIDEO , 16 }, /* 50M PAL */
94  { CODEC_ID_AC3 , 17 },
95  //{ CODEC_ID_NONE, , 18 }, /* Non compressed 24 bit audio */
96  { CODEC_ID_MPEG2VIDEO, 20 }, /* MPEG HD */
97  { CODEC_ID_MPEG1VIDEO, 22 }, /* NTSC */
98  { CODEC_ID_MPEG1VIDEO, 23 }, /* PAL */
99  { CODEC_ID_NONE, 0 },
100 };
101 
102 #define SERVER_PATH "EXT:/PDR/default/"
103 #define ES_NAME_PATTERN "EXT:/PDR/default/ES."
104 
106 {
107  GXFStreamContext *sc = st->priv_data;
108  int i;
109 
110  for (i = 0; i < 6; ++i) {
111  if (st->codec->height == gxf_lines_tab[i].height) {
112  sc->lines_index = gxf_lines_tab[i].index;
113  return 0;
114  }
115  }
116  return -1;
117 }
118 
119 static void gxf_write_padding(AVIOContext *pb, int64_t to_pad)
120 {
121  for (; to_pad > 0; to_pad--) {
122  avio_w8(pb, 0);
123  }
124 }
125 
126 static int64_t updatePacketSize(AVIOContext *pb, int64_t pos)
127 {
128  int64_t curpos;
129  int size;
130 
131  size = avio_tell(pb) - pos;
132  if (size % 4) {
133  gxf_write_padding(pb, 4 - size % 4);
134  size = avio_tell(pb) - pos;
135  }
136  curpos = avio_tell(pb);
137  avio_seek(pb, pos + 6, SEEK_SET);
138  avio_wb32(pb, size);
139  avio_seek(pb, curpos, SEEK_SET);
140  return curpos - pos;
141 }
142 
143 static int64_t updateSize(AVIOContext *pb, int64_t pos)
144 {
145  int64_t curpos;
146 
147  curpos = avio_tell(pb);
148  avio_seek(pb, pos, SEEK_SET);
149  avio_wb16(pb, curpos - pos - 2);
150  avio_seek(pb, curpos, SEEK_SET);
151  return curpos - pos;
152 }
153 
155 {
156  avio_wb32(pb, 0); /* packet leader for synchro */
157  avio_w8(pb, 1);
158  avio_w8(pb, type); /* map packet */
159  avio_wb32(pb, 0); /* size */
160  avio_wb32(pb, 0); /* reserved */
161  avio_w8(pb, 0xE1); /* trailer 1 */
162  avio_w8(pb, 0xE2); /* trailer 2 */
163 }
164 
166 {
167  GXFStreamContext *sc = st->priv_data;
168  char buffer[1024];
169  int size, starting_line;
170 
171  if (sc->iframes) {
172  sc->p_per_gop = sc->pframes / sc->iframes;
173  if (sc->pframes % sc->iframes)
174  sc->p_per_gop++;
175  if (sc->pframes) {
176  sc->b_per_i_or_p = sc->bframes / sc->pframes;
177  if (sc->bframes % sc->pframes)
178  sc->b_per_i_or_p++;
179  }
180  if (sc->p_per_gop > 9)
181  sc->p_per_gop = 9; /* ensure value won't take more than one char */
182  if (sc->b_per_i_or_p > 9)
183  sc->b_per_i_or_p = 9; /* ensure value won't take more than one char */
184  }
185  if (st->codec->height == 512 || st->codec->height == 608)
186  starting_line = 7; // VBI
187  else if (st->codec->height == 480)
188  starting_line = 20;
189  else
190  starting_line = 23; // default PAL
191 
192  size = snprintf(buffer, 1024, "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n"
193  "Pix 0\nCf %d\nCg %d\nSl %d\nnl16 %d\nVi 1\nf1 1\n",
194  (float)st->codec->bit_rate, sc->p_per_gop, sc->b_per_i_or_p,
195  st->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1, sc->first_gop_closed == 1,
196  starting_line, (st->codec->height + 15) / 16);
197  avio_w8(pb, TRACK_MPG_AUX);
198  avio_w8(pb, size + 1);
199  avio_write(pb, (uint8_t *)buffer, size + 1);
200  return size + 3;
201 }
202 
204 {
205  avio_w8(pb, 0); /* fields */
206  avio_w8(pb, 0); /* seconds */
207  avio_w8(pb, 0); /* minutes */
208  avio_w8(pb, 0); /* flags + hours */
209  /* reserved */
210  avio_wb32(pb, 0);
211  return 8;
212 }
213 
215 {
216  AVIOContext *pb = s->pb;
217  int64_t pos;
218  int mpeg = sc->track_type == 4 || sc->track_type == 9;
219 
220  /* track description section */
221  avio_w8(pb, sc->media_type + 0x80);
222  avio_w8(pb, index + 0xC0);
223 
224  pos = avio_tell(pb);
225  avio_wb16(pb, 0); /* size */
226 
227  /* media file name */
228  avio_w8(pb, TRACK_NAME);
229  avio_w8(pb, strlen(ES_NAME_PATTERN) + 3);
230  avio_write(pb, ES_NAME_PATTERN, sizeof(ES_NAME_PATTERN) - 1);
231  avio_wb16(pb, sc->media_info);
232  avio_w8(pb, 0);
233 
234  if (!mpeg) {
235  /* auxiliary information */
236  avio_w8(pb, TRACK_AUX);
237  avio_w8(pb, 8);
238  if (sc->track_type == 3)
240  else
241  avio_wl64(pb, 0);
242  }
243 
244  /* file system version */
245  avio_w8(pb, TRACK_VER);
246  avio_w8(pb, 4);
247  avio_wb32(pb, 0);
248 
249  if (mpeg)
250  gxf_write_mpeg_auxiliary(pb, s->streams[index]);
251 
252  /* frame rate */
253  avio_w8(pb, TRACK_FPS);
254  avio_w8(pb, 4);
255  avio_wb32(pb, sc->frame_rate_index);
256 
257  /* lines per frame */
258  avio_w8(pb, TRACK_LINES);
259  avio_w8(pb, 4);
260  avio_wb32(pb, sc->lines_index);
261 
262  /* fields per frame */
263  avio_w8(pb, TRACK_FPF);
264  avio_w8(pb, 4);
265  avio_wb32(pb, sc->fields);
266 
267  return updateSize(pb, pos);
268 }
269 
271 {
272  GXFContext *gxf = s->priv_data;
273  AVIOContext *pb = s->pb;
274  int64_t pos;
275  int len;
276  const char *filename = strrchr(s->filename, '/');
277 
278  pos = avio_tell(pb);
279  avio_wb16(pb, 0); /* size */
280 
281  /* name */
282  if (filename)
283  filename++;
284  else
285  filename = s->filename;
286  len = strlen(filename);
287 
288  avio_w8(pb, MAT_NAME);
289  avio_w8(pb, strlen(SERVER_PATH) + len + 1);
290  avio_write(pb, SERVER_PATH, sizeof(SERVER_PATH) - 1);
291  avio_write(pb, filename, len);
292  avio_w8(pb, 0);
293 
294  /* first field */
296  avio_w8(pb, 4);
297  avio_wb32(pb, 0);
298 
299  /* last field */
300  avio_w8(pb, MAT_LAST_FIELD);
301  avio_w8(pb, 4);
302  avio_wb32(pb, gxf->nb_fields);
303 
304  /* reserved */
305  avio_w8(pb, MAT_MARK_IN);
306  avio_w8(pb, 4);
307  avio_wb32(pb, 0);
308 
309  avio_w8(pb, MAT_MARK_OUT);
310  avio_w8(pb, 4);
311  avio_wb32(pb, gxf->nb_fields);
312 
313  /* estimated size */
314  avio_w8(pb, MAT_SIZE);
315  avio_w8(pb, 4);
316  avio_wb32(pb, avio_size(pb) / 1024);
317 
318  return updateSize(pb, pos);
319 }
320 
322 {
323  GXFContext *gxf = s->priv_data;
324  AVIOContext *pb = s->pb;
325  int64_t pos;
326  int i;
327 
328  pos = avio_tell(pb);
329  avio_wb16(pb, 0); /* size */
330  for (i = 0; i < s->nb_streams; ++i)
332 
334 
335  return updateSize(pb, pos);
336 }
337 
338 static int gxf_write_map_packet(AVFormatContext *s, int rewrite)
339 {
340  GXFContext *gxf = s->priv_data;
341  AVIOContext *pb = s->pb;
342  int64_t pos = avio_tell(pb);
343 
344  if (!rewrite) {
345  if (!(gxf->map_offsets_nb % 30)) {
346  gxf->map_offsets = av_realloc(gxf->map_offsets,
347  (gxf->map_offsets_nb+30)*sizeof(*gxf->map_offsets));
348  if (!gxf->map_offsets) {
349  av_log(s, AV_LOG_ERROR, "could not realloc map offsets\n");
350  return -1;
351  }
352  }
353  gxf->map_offsets[gxf->map_offsets_nb++] = pos; // do not increment here
354  }
355 
357 
358  /* preamble */
359  avio_w8(pb, 0xE0); /* version */
360  avio_w8(pb, 0xFF); /* reserved */
361 
364 
365  return updatePacketSize(pb, pos);
366 }
367 
369 {
370  GXFContext *gxf = s->priv_data;
371  AVIOContext *pb = s->pb;
372  int64_t pos = avio_tell(pb);
373  int fields_per_flt = (gxf->nb_fields+1) / 1000 + 1;
374  int flt_entries = gxf->nb_fields / fields_per_flt;
375  int i = 0;
376 
378 
379  avio_wl32(pb, fields_per_flt); /* number of fields */
380  avio_wl32(pb, flt_entries); /* number of active flt entries */
381 
382  if (gxf->flt_entries) {
383  for (i = 0; i < flt_entries; i++)
384  avio_wl32(pb, gxf->flt_entries[(i*fields_per_flt)>>1]);
385  }
386 
387  for (; i < 1000; i++)
388  avio_wl32(pb, 0);
389 
390  return updatePacketSize(pb, pos);
391 }
392 
394 {
395  GXFContext *gxf = s->priv_data;
396  AVIOContext *pb = s->pb;
397  int timecode_base = gxf->time_base.den == 60000 ? 60 : 50;
398  int64_t timestamp = 0;
400  uint32_t timecode;
401 
402 #if FF_API_TIMESTAMP
403  if (s->timestamp)
404  timestamp = s->timestamp;
405  else
406 #endif
407  if (t = av_dict_get(s->metadata, "creation_time", NULL, 0))
408  timestamp = ff_iso8601_to_unix_time(t->value);
409 
410  // XXX drop frame
411  timecode =
412  gxf->nb_fields / (timecode_base * 3600) % 24 << 24 | // hours
413  gxf->nb_fields / (timecode_base * 60) % 60 << 16 | // minutes
414  gxf->nb_fields / timecode_base % 60 << 8 | // seconds
415  gxf->nb_fields % timecode_base; // fields
416 
417  avio_wl32(pb, gxf->flags);
418  avio_wl32(pb, gxf->nb_fields); /* length of the longest track */
419  avio_wl32(pb, gxf->nb_fields); /* length of the shortest track */
420  avio_wl32(pb, 0); /* mark in */
421  avio_wl32(pb, gxf->nb_fields); /* mark out */
422  avio_wl32(pb, 0); /* timecode mark in */
423  avio_wl32(pb, timecode); /* timecode mark out */
424  avio_wl64(pb, timestamp); /* modification time */
425  avio_wl64(pb, timestamp); /* creation time */
426  avio_wl16(pb, 0); /* reserved */
427  avio_wl16(pb, 0); /* reserved */
428  avio_wl16(pb, gxf->audio_tracks);
429  avio_wl16(pb, 1); /* timecode track count */
430  avio_wl16(pb, 0); /* reserved */
431  avio_wl16(pb, gxf->mpeg_tracks);
432  return 48;
433 }
434 
436 {
437  GXFContext *gxf = s->priv_data;
438  AVIOContext *pb = s->pb;
439 
440  avio_wl32(pb, gxf->umf_length); /* total length of the umf data */
441  avio_wl32(pb, 3); /* version */
442  avio_wl32(pb, s->nb_streams+1);
443  avio_wl32(pb, gxf->umf_track_offset); /* umf track section offset */
444  avio_wl32(pb, gxf->umf_track_size);
445  avio_wl32(pb, s->nb_streams+1);
446  avio_wl32(pb, gxf->umf_media_offset);
447  avio_wl32(pb, gxf->umf_media_size);
448  avio_wl32(pb, gxf->umf_length); /* user data offset */
449  avio_wl32(pb, 0); /* user data size */
450  avio_wl32(pb, 0); /* reserved */
451  avio_wl32(pb, 0); /* reserved */
452  return 48;
453 }
454 
456 {
457  AVIOContext *pb = s->pb;
458  GXFContext *gxf = s->priv_data;
459  int64_t pos = avio_tell(pb);
460  int i;
461 
462  gxf->umf_track_offset = pos - gxf->umf_start_offset;
463  for (i = 0; i < s->nb_streams; ++i) {
464  GXFStreamContext *sc = s->streams[i]->priv_data;
465  avio_wl16(pb, sc->media_info);
466  avio_wl16(pb, 1);
467  }
468 
470  avio_wl16(pb, 1);
471 
472  return avio_tell(pb) - pos;
473 }
474 
476 {
477  GXFStreamContext *sc = st->priv_data;
478 
479  if (st->codec->pix_fmt == PIX_FMT_YUV422P)
480  avio_wl32(pb, 2);
481  else
482  avio_wl32(pb, 1); /* default to 420 */
483  avio_wl32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
484  avio_wl32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
485  avio_wl32(pb, 1); /* I picture per GOP */
486  avio_wl32(pb, sc->p_per_gop);
487  avio_wl32(pb, sc->b_per_i_or_p);
488  if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO)
489  avio_wl32(pb, 2);
490  else if (st->codec->codec_id == CODEC_ID_MPEG1VIDEO)
491  avio_wl32(pb, 1);
492  else
493  avio_wl32(pb, 0);
494  avio_wl32(pb, 0); /* reserved */
495  return 32;
496 }
497 
499 {
500  avio_wl32(pb, 1); /* non drop frame */
501  avio_wl32(pb, 0); /* reserved */
502  avio_wl32(pb, 0); /* reserved */
503  avio_wl32(pb, 0); /* reserved */
504  avio_wl32(pb, 0); /* reserved */
505  avio_wl32(pb, 0); /* reserved */
506  avio_wl32(pb, 0); /* reserved */
507  avio_wl32(pb, 0); /* reserved */
508  return 32;
509 }
510 
512 {
513  int i;
514 
515  for (i = 0; i < 8; i++) {
516  avio_wb32(pb, 0);
517  }
518  return 32;
519 }
520 
522 {
523  avio_wl64(pb, av_double2int(1)); /* sound level to begin to */
524  avio_wl64(pb, av_double2int(1)); /* sound level to begin to */
525  avio_wl32(pb, 0); /* number of fields over which to ramp up sound level */
526  avio_wl32(pb, 0); /* number of fields over which to ramp down sound level */
527  avio_wl32(pb, 0); /* reserved */
528  avio_wl32(pb, 0); /* reserved */
529  return 32;
530 }
531 
532 #if 0
533 static int gxf_write_umf_media_mjpeg(AVIOContext *pb, GXFStreamContext *sc)
534 {
535  avio_wb64(pb, 0); /* FIXME FLOAT max chroma quant level */
536  avio_wb64(pb, 0); /* FIXME FLOAT max luma quant level */
537  avio_wb64(pb, 0); /* FIXME FLOAT min chroma quant level */
538  avio_wb64(pb, 0); /* FIXME FLOAT min luma quant level */
539  return 32;
540 }
541 #endif
542 
544 {
545  GXFContext *gxf = s->priv_data;
546  AVIOContext *pb = s->pb;
547  int64_t pos;
548  int i, j;
549 
550  pos = avio_tell(pb);
551  gxf->umf_media_offset = pos - gxf->umf_start_offset;
552  for (i = 0; i <= s->nb_streams; ++i) {
553  GXFStreamContext *sc;
554  int64_t startpos, curpos;
555 
556  if (i == s->nb_streams)
557  sc = &gxf->timecode_track;
558  else
559  sc = s->streams[i]->priv_data;
560 
561  startpos = avio_tell(pb);
562  avio_wl16(pb, 0); /* length */
563  avio_wl16(pb, sc->media_info);
564  avio_wl16(pb, 0); /* reserved */
565  avio_wl16(pb, 0); /* reserved */
566  avio_wl32(pb, gxf->nb_fields);
567  avio_wl32(pb, 0); /* attributes rw, ro */
568  avio_wl32(pb, 0); /* mark in */
569  avio_wl32(pb, gxf->nb_fields); /* mark out */
571  avio_wb16(pb, sc->media_info);
572  for (j = strlen(ES_NAME_PATTERN)+2; j < 88; j++)
573  avio_w8(pb, 0);
574  avio_wl32(pb, sc->track_type);
575  avio_wl32(pb, sc->sample_rate);
576  avio_wl32(pb, sc->sample_size);
577  avio_wl32(pb, 0); /* reserved */
578 
579  if (sc == &gxf->timecode_track)
580  gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
581  else {
582  AVStream *st = s->streams[i];
583  switch (st->codec->codec_id) {
584  case CODEC_ID_MPEG1VIDEO:
585  case CODEC_ID_MPEG2VIDEO:
586  gxf_write_umf_media_mpeg(pb, st);
587  break;
588  case CODEC_ID_PCM_S16LE:
590  break;
591  case CODEC_ID_DVVIDEO:
592  gxf_write_umf_media_dv(pb, sc);
593  break;
594  }
595  }
596 
597  curpos = avio_tell(pb);
598  avio_seek(pb, startpos, SEEK_SET);
599  avio_wl16(pb, curpos - startpos);
600  avio_seek(pb, curpos, SEEK_SET);
601  }
602  return avio_tell(pb) - pos;
603 }
604 
606 {
607  GXFContext *gxf = s->priv_data;
608  AVIOContext *pb = s->pb;
609  int64_t pos = avio_tell(pb);
610 
612 
613  /* preamble */
614  avio_w8(pb, 3); /* first and last (only) packet */
615  avio_wb32(pb, gxf->umf_length); /* data length */
616 
617  gxf->umf_start_offset = avio_tell(pb);
622  gxf->umf_length = avio_tell(pb) - gxf->umf_start_offset;
623  return updatePacketSize(pb, pos);
624 }
625 
626 static const int GXF_samples_per_frame[] = { 32768, 0 };
627 
629 {
630  if (!vsc)
631  return;
632 
633  sc->media_type = vsc->sample_rate == 60 ? 7 : 8;
634  sc->sample_rate = vsc->sample_rate;
635  sc->media_info = ('T'<<8) | '0';
636  sc->track_type = 3;
638  sc->lines_index = vsc->lines_index;
639  sc->sample_size = 16;
640  sc->fields = vsc->fields;
641 }
642 
644 {
645  AVIOContext *pb = s->pb;
646  GXFContext *gxf = s->priv_data;
647  GXFStreamContext *vsc = NULL;
648  uint8_t tracks[255] = {0};
649  int i, media_info = 0;
650 
651  if (!pb->seekable) {
652  av_log(s, AV_LOG_ERROR, "gxf muxer does not support streamed output, patch welcome");
653  return -1;
654  }
655 
656  gxf->flags |= 0x00080000; /* material is simple clip */
657  for (i = 0; i < s->nb_streams; ++i) {
658  AVStream *st = s->streams[i];
659  GXFStreamContext *sc = av_mallocz(sizeof(*sc));
660  if (!sc)
661  return AVERROR(ENOMEM);
662  st->priv_data = sc;
663 
664  sc->media_type = ff_codec_get_tag(gxf_media_types, st->codec->codec_id);
665  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
666  if (st->codec->codec_id != CODEC_ID_PCM_S16LE) {
667  av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
668  return -1;
669  }
670  if (st->codec->sample_rate != 48000) {
671  av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
672  return -1;
673  }
674  if (st->codec->channels != 1) {
675  av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
676  return -1;
677  }
678  sc->track_type = 2;
679  sc->sample_rate = st->codec->sample_rate;
680  avpriv_set_pts_info(st, 64, 1, sc->sample_rate);
681  sc->sample_size = 16;
682  sc->frame_rate_index = -2;
683  sc->lines_index = -2;
684  sc->fields = -2;
685  gxf->audio_tracks++;
686  gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
687  media_info = 'A';
688  } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
689  if (i != 0) {
690  av_log(s, AV_LOG_ERROR, "video stream must be the first track\n");
691  return -1;
692  }
693  /* FIXME check from time_base ? */
694  if (st->codec->height == 480 || st->codec->height == 512) { /* NTSC or NTSC+VBI */
695  sc->frame_rate_index = 5;
696  sc->sample_rate = 60;
697  gxf->flags |= 0x00000080;
698  gxf->time_base = (AVRational){ 1001, 60000 };
699  } else if (st->codec->height == 576 || st->codec->height == 608) { /* PAL or PAL+VBI */
700  sc->frame_rate_index = 6;
701  sc->media_type++;
702  sc->sample_rate = 50;
703  gxf->flags |= 0x00000040;
704  gxf->time_base = (AVRational){ 1, 50 };
705  } else {
706  av_log(s, AV_LOG_ERROR, "unsupported video resolution, "
707  "gxf muxer only accepts PAL or NTSC resolutions currently\n");
708  return -1;
709  }
710  avpriv_set_pts_info(st, 64, gxf->time_base.num, gxf->time_base.den);
711  if (gxf_find_lines_index(st) < 0)
712  sc->lines_index = -1;
713  sc->sample_size = st->codec->bit_rate;
714  sc->fields = 2; /* interlaced */
715 
716  vsc = sc;
717 
718  switch (st->codec->codec_id) {
719  case CODEC_ID_MJPEG:
720  sc->track_type = 1;
721  gxf->flags |= 0x00004000;
722  media_info = 'J';
723  break;
724  case CODEC_ID_MPEG1VIDEO:
725  sc->track_type = 9;
726  gxf->mpeg_tracks++;
727  media_info = 'L';
728  break;
729  case CODEC_ID_MPEG2VIDEO:
730  sc->first_gop_closed = -1;
731  sc->track_type = 4;
732  gxf->mpeg_tracks++;
733  gxf->flags |= 0x00008000;
734  media_info = 'M';
735  break;
736  case CODEC_ID_DVVIDEO:
737  if (st->codec->pix_fmt == PIX_FMT_YUV422P) {
738  sc->media_type += 2;
739  sc->track_type = 6;
740  gxf->flags |= 0x00002000;
741  media_info = 'E';
742  } else {
743  sc->track_type = 5;
744  gxf->flags |= 0x00001000;
745  media_info = 'D';
746  }
747  break;
748  default:
749  av_log(s, AV_LOG_ERROR, "video codec not supported\n");
750  return -1;
751  }
752  }
753  /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
754  sc->media_info = media_info<<8 | ('0'+tracks[media_info]++);
755  sc->order = s->nb_streams - st->index;
756  }
757 
758  if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0)
759  return -1;
760 
762  gxf->flags |= 0x200000; // time code track is non-drop frame
763 
764  gxf_write_map_packet(s, 0);
767 
768  gxf->packet_count = 3;
769 
770  avio_flush(pb);
771  return 0;
772 }
773 
775 {
776  int64_t pos = avio_tell(pb);
777 
779  return updatePacketSize(pb, pos);
780 }
781 
783 {
784  GXFContext *gxf = s->priv_data;
785  AVIOContext *pb = s->pb;
786  int64_t end;
787  int i;
788 
790 
792  end = avio_tell(pb);
793  avio_seek(pb, 0, SEEK_SET);
794  /* overwrite map, flt and umf packets with new values */
795  gxf_write_map_packet(s, 1);
798  avio_flush(pb);
799  /* update duration in all map packets */
800  for (i = 1; i < gxf->map_offsets_nb; i++) {
801  avio_seek(pb, gxf->map_offsets[i], SEEK_SET);
802  gxf_write_map_packet(s, 1);
803  avio_flush(pb);
804  }
805 
806  avio_seek(pb, end, SEEK_SET);
807 
808  av_freep(&gxf->flt_entries);
809  av_freep(&gxf->map_offsets);
810 
811  return 0;
812 }
813 
814 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
815 {
816  uint32_t c=-1;
817  int i;
818  for(i=0; i<size-4 && c!=0x100; i++){
819  c = (c<<8) + buf[i];
820  if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
821  sc->first_gop_closed= (buf[i+4]>>6)&1;
822  }
823  return (buf[i+1]>>3)&7;
824 }
825 
827 {
828  GXFContext *gxf = s->priv_data;
829  AVIOContext *pb = s->pb;
830  AVStream *st = s->streams[pkt->stream_index];
831  GXFStreamContext *sc = st->priv_data;
832  unsigned field_nb;
833  /* If the video is frame-encoded, the frame numbers shall be represented by
834  * even field numbers.
835  * see SMPTE360M-2004 6.4.2.1.3 Media field number */
836  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
837  field_nb = gxf->nb_fields;
838  } else {
839  field_nb = av_rescale_rnd(pkt->dts, gxf->time_base.den,
840  (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
841  }
842 
843  avio_w8(pb, sc->media_type);
844  avio_w8(pb, st->index);
845  avio_wb32(pb, field_nb);
846  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
847  avio_wb16(pb, 0);
848  avio_wb16(pb, size / 2);
849  } else if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
850  int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
851  if (frame_type == AV_PICTURE_TYPE_I) {
852  avio_w8(pb, 0x0d);
853  sc->iframes++;
854  } else if (frame_type == AV_PICTURE_TYPE_B) {
855  avio_w8(pb, 0x0f);
856  sc->bframes++;
857  } else {
858  avio_w8(pb, 0x0e);
859  sc->pframes++;
860  }
861  avio_wb24(pb, size);
862  } else if (st->codec->codec_id == CODEC_ID_DVVIDEO) {
863  avio_w8(pb, size / 4096);
864  avio_wb24(pb, 0);
865  } else
866  avio_wb32(pb, size);
867  avio_wb32(pb, field_nb);
868  avio_w8(pb, 1); /* flags */
869  avio_w8(pb, 0); /* reserved */
870  return 16;
871 }
872 
874 {
875  GXFContext *gxf = s->priv_data;
876  AVIOContext *pb = s->pb;
877  AVStream *st = s->streams[pkt->stream_index];
878  int64_t pos = avio_tell(pb);
879  int padding = 0;
880  int packet_start_offset = avio_tell(pb) / 1024;
881 
883  if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
884  padding = 4 - pkt->size % 4;
885  else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
886  padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
887  gxf_write_media_preamble(s, pkt, pkt->size + padding);
888  avio_write(pb, pkt->data, pkt->size);
889  gxf_write_padding(pb, padding);
890 
891  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
892  if (!(gxf->flt_entries_nb % 500)) {
893  gxf->flt_entries = av_realloc(gxf->flt_entries,
894  (gxf->flt_entries_nb+500)*sizeof(*gxf->flt_entries));
895  if (!gxf->flt_entries) {
896  av_log(s, AV_LOG_ERROR, "could not reallocate flt entries\n");
897  return -1;
898  }
899  }
900  gxf->flt_entries[gxf->flt_entries_nb++] = packet_start_offset;
901  gxf->nb_fields += 2; // count fields
902  }
903 
904  updatePacketSize(pb, pos);
905 
906  gxf->packet_count++;
907  if (gxf->packet_count == 100) {
908  gxf_write_map_packet(s, 0);
909  gxf->packet_count = 0;
910  }
911 
912  avio_flush(pb);
913 
914  return 0;
915 }
916 
918 {
919  GXFContext *gxf = s->priv_data;
920  AVPacket *pkt[2] = { cur, next };
921  int i, field_nb[2];
922  GXFStreamContext *sc[2];
923 
924  for (i = 0; i < 2; i++) {
925  AVStream *st = s->streams[pkt[i]->stream_index];
926  sc[i] = st->priv_data;
927  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
928  field_nb[i] = av_rescale_rnd(pkt[i]->dts, gxf->time_base.den,
929  (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
930  field_nb[i] &= ~1; // compare against even field number because audio must be before video
931  } else
932  field_nb[i] = pkt[i]->dts; // dts are field based
933  }
934 
935  return field_nb[1] > field_nb[0] ||
936  (field_nb[1] == field_nb[0] && sc[1]->order > sc[0]->order);
937 }
938 
940 {
941  if (pkt && s->streams[pkt->stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
942  pkt->duration = 2; // enforce 2 fields
943  return ff_audio_rechunk_interleave(s, out, pkt, flush,
945 }
946 
948  .name = "gxf",
949  .long_name = NULL_IF_CONFIG_SMALL("GXF format"),
950  .extensions = "gxf",
951  .priv_data_size = sizeof(GXFContext),
952  .audio_codec = CODEC_ID_PCM_S16LE,
953  .video_codec = CODEC_ID_MPEG2VIDEO,
958 };