3 * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
5 * This file is part of Libav.
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.
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.
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
22 #include "libavutil/intfloat.h"
23 #include "libavutil/mathematics.h"
28 #include "audiointerleave.h"
30 #define GXF_AUDIO_PACKET_SIZE 65536
32 typedef struct GXFStreamContext {
33 AudioInterleaveContext aic;
46 int b_per_i_or_p; ///< number of B frames per I frame or P frame
48 unsigned order; ///< interleaving order
51 typedef struct GXFContext {
53 uint16_t audio_tracks;
55 int64_t creation_time;
56 uint32_t umf_start_offset;
57 uint32_t umf_track_offset;
58 uint32_t umf_media_offset;
60 uint16_t umf_track_size;
61 uint16_t umf_media_size;
64 GXFStreamContext timecode_track;
65 unsigned *flt_entries; ///< offsets of packets /1024, starts after 2nd video field
66 unsigned flt_entries_nb;
67 uint64_t *map_offsets; ///< offset of map packets
68 unsigned map_offsets_nb;
69 unsigned packet_count;
75 { 480, 1 }, /* NTSC */
76 { 512, 1 }, /* NTSC + VBI */
78 { 608, 2 }, /* PAL + VBI */
83 static const AVCodecTag gxf_media_types[] = {
84 { AV_CODEC_ID_MJPEG , 3 }, /* NTSC */
85 { AV_CODEC_ID_MJPEG , 4 }, /* PAL */
86 { AV_CODEC_ID_PCM_S24LE , 9 },
87 { AV_CODEC_ID_PCM_S16LE , 10 },
88 { AV_CODEC_ID_MPEG2VIDEO, 11 }, /* NTSC */
89 { AV_CODEC_ID_MPEG2VIDEO, 12 }, /* PAL */
90 { AV_CODEC_ID_DVVIDEO , 13 }, /* NTSC */
91 { AV_CODEC_ID_DVVIDEO , 14 }, /* PAL */
92 { AV_CODEC_ID_DVVIDEO , 15 }, /* 50M NTSC */
93 { AV_CODEC_ID_DVVIDEO , 16 }, /* 50M PAL */
94 { AV_CODEC_ID_AC3 , 17 },
95 //{ AV_CODEC_ID_NONE, , 18 }, /* Non compressed 24 bit audio */
96 { AV_CODEC_ID_MPEG2VIDEO, 20 }, /* MPEG HD */
97 { AV_CODEC_ID_MPEG1VIDEO, 22 }, /* NTSC */
98 { AV_CODEC_ID_MPEG1VIDEO, 23 }, /* PAL */
99 { AV_CODEC_ID_NONE, 0 },
102 #define SERVER_PATH "EXT:/PDR/default/"
103 #define ES_NAME_PATTERN "EXT:/PDR/default/ES."
105 static int gxf_find_lines_index(AVStream *st)
107 GXFStreamContext *sc = st->priv_data;
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;
119 static void gxf_write_padding(AVIOContext *pb, int64_t to_pad)
121 for (; to_pad > 0; to_pad--) {
126 static int64_t updatePacketSize(AVIOContext *pb, int64_t pos)
131 size = avio_tell(pb) - pos;
133 gxf_write_padding(pb, 4 - size % 4);
134 size = avio_tell(pb) - pos;
136 curpos = avio_tell(pb);
137 avio_seek(pb, pos + 6, SEEK_SET);
139 avio_seek(pb, curpos, SEEK_SET);
143 static int64_t updateSize(AVIOContext *pb, int64_t pos)
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);
154 static void gxf_write_packet_header(AVIOContext *pb, GXFPktType type)
156 avio_wb32(pb, 0); /* packet leader for synchro */
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 */
165 static int gxf_write_mpeg_auxiliary(AVIOContext *pb, AVStream *st)
167 GXFStreamContext *sc = st->priv_data;
169 int size, starting_line;
172 sc->p_per_gop = sc->pframes / sc->iframes;
173 if (sc->pframes % sc->iframes)
176 sc->b_per_i_or_p = sc->bframes / sc->pframes;
177 if (sc->bframes % sc->pframes)
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 */
185 if (st->codec->height == 512 || st->codec->height == 608)
186 starting_line = 7; // VBI
187 else if (st->codec->height == 480)
190 starting_line = 23; // default PAL
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);
203 static int gxf_write_timecode_auxiliary(AVIOContext *pb, GXFStreamContext *sc)
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 */
214 static int gxf_write_track_description(AVFormatContext *s, GXFStreamContext *sc, int index)
216 AVIOContext *pb = s->pb;
218 int mpeg = sc->track_type == 4 || sc->track_type == 9;
220 /* track description section */
221 avio_w8(pb, sc->media_type + 0x80);
222 avio_w8(pb, index + 0xC0);
225 avio_wb16(pb, 0); /* size */
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);
235 /* auxiliary information */
236 avio_w8(pb, TRACK_AUX);
238 if (sc->track_type == 3)
239 gxf_write_timecode_auxiliary(pb, sc);
244 /* file system version */
245 avio_w8(pb, TRACK_VER);
250 gxf_write_mpeg_auxiliary(pb, s->streams[index]);
253 avio_w8(pb, TRACK_FPS);
255 avio_wb32(pb, sc->frame_rate_index);
257 /* lines per frame */
258 avio_w8(pb, TRACK_LINES);
260 avio_wb32(pb, sc->lines_index);
262 /* fields per frame */
263 avio_w8(pb, TRACK_FPF);
265 avio_wb32(pb, sc->fields);
267 return updateSize(pb, pos);
270 static int gxf_write_material_data_section(AVFormatContext *s)
272 GXFContext *gxf = s->priv_data;
273 AVIOContext *pb = s->pb;
276 const char *filename = strrchr(s->filename, '/');
279 avio_wb16(pb, 0); /* size */
285 filename = s->filename;
286 len = strlen(filename);
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);
295 avio_w8(pb, MAT_FIRST_FIELD);
300 avio_w8(pb, MAT_LAST_FIELD);
302 avio_wb32(pb, gxf->nb_fields);
305 avio_w8(pb, MAT_MARK_IN);
309 avio_w8(pb, MAT_MARK_OUT);
311 avio_wb32(pb, gxf->nb_fields);
314 avio_w8(pb, MAT_SIZE);
316 avio_wb32(pb, avio_size(pb) / 1024);
318 return updateSize(pb, pos);
321 static int gxf_write_track_description_section(AVFormatContext *s)
323 GXFContext *gxf = s->priv_data;
324 AVIOContext *pb = s->pb;
329 avio_wb16(pb, 0); /* size */
330 for (i = 0; i < s->nb_streams; ++i)
331 gxf_write_track_description(s, s->streams[i]->priv_data, i);
333 gxf_write_track_description(s, &gxf->timecode_track, s->nb_streams);
335 return updateSize(pb, pos);
338 static int gxf_write_map_packet(AVFormatContext *s, int rewrite)
340 GXFContext *gxf = s->priv_data;
341 AVIOContext *pb = s->pb;
342 int64_t pos = avio_tell(pb);
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");
353 gxf->map_offsets[gxf->map_offsets_nb++] = pos; // do not increment here
356 gxf_write_packet_header(pb, PKT_MAP);
359 avio_w8(pb, 0xE0); /* version */
360 avio_w8(pb, 0xFF); /* reserved */
362 gxf_write_material_data_section(s);
363 gxf_write_track_description_section(s);
365 return updatePacketSize(pb, pos);
368 static int gxf_write_flt_packet(AVFormatContext *s)
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;
377 gxf_write_packet_header(pb, PKT_FLT);
379 avio_wl32(pb, fields_per_flt); /* number of fields */
380 avio_wl32(pb, flt_entries); /* number of active flt entries */
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]);
387 for (; i < 1000; i++)
390 return updatePacketSize(pb, pos);
393 static int gxf_write_umf_material_description(AVFormatContext *s)
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;
399 AVDictionaryEntry *t;
402 if (t = av_dict_get(s->metadata, "creation_time", NULL, 0))
403 timestamp = ff_iso8601_to_unix_time(t->value);
407 gxf->nb_fields / (timecode_base * 3600) % 24 << 24 | // hours
408 gxf->nb_fields / (timecode_base * 60) % 60 << 16 | // minutes
409 gxf->nb_fields / timecode_base % 60 << 8 | // seconds
410 gxf->nb_fields % timecode_base; // fields
412 avio_wl32(pb, gxf->flags);
413 avio_wl32(pb, gxf->nb_fields); /* length of the longest track */
414 avio_wl32(pb, gxf->nb_fields); /* length of the shortest track */
415 avio_wl32(pb, 0); /* mark in */
416 avio_wl32(pb, gxf->nb_fields); /* mark out */
417 avio_wl32(pb, 0); /* timecode mark in */
418 avio_wl32(pb, timecode); /* timecode mark out */
419 avio_wl64(pb, timestamp); /* modification time */
420 avio_wl64(pb, timestamp); /* creation time */
421 avio_wl16(pb, 0); /* reserved */
422 avio_wl16(pb, 0); /* reserved */
423 avio_wl16(pb, gxf->audio_tracks);
424 avio_wl16(pb, 1); /* timecode track count */
425 avio_wl16(pb, 0); /* reserved */
426 avio_wl16(pb, gxf->mpeg_tracks);
430 static int gxf_write_umf_payload(AVFormatContext *s)
432 GXFContext *gxf = s->priv_data;
433 AVIOContext *pb = s->pb;
435 avio_wl32(pb, gxf->umf_length); /* total length of the umf data */
436 avio_wl32(pb, 3); /* version */
437 avio_wl32(pb, s->nb_streams+1);
438 avio_wl32(pb, gxf->umf_track_offset); /* umf track section offset */
439 avio_wl32(pb, gxf->umf_track_size);
440 avio_wl32(pb, s->nb_streams+1);
441 avio_wl32(pb, gxf->umf_media_offset);
442 avio_wl32(pb, gxf->umf_media_size);
443 avio_wl32(pb, gxf->umf_length); /* user data offset */
444 avio_wl32(pb, 0); /* user data size */
445 avio_wl32(pb, 0); /* reserved */
446 avio_wl32(pb, 0); /* reserved */
450 static int gxf_write_umf_track_description(AVFormatContext *s)
452 AVIOContext *pb = s->pb;
453 GXFContext *gxf = s->priv_data;
454 int64_t pos = avio_tell(pb);
457 gxf->umf_track_offset = pos - gxf->umf_start_offset;
458 for (i = 0; i < s->nb_streams; ++i) {
459 GXFStreamContext *sc = s->streams[i]->priv_data;
460 avio_wl16(pb, sc->media_info);
464 avio_wl16(pb, gxf->timecode_track.media_info);
467 return avio_tell(pb) - pos;
470 static int gxf_write_umf_media_mpeg(AVIOContext *pb, AVStream *st)
472 GXFStreamContext *sc = st->priv_data;
474 if (st->codec->pix_fmt == PIX_FMT_YUV422P)
477 avio_wl32(pb, 1); /* default to 420 */
478 avio_wl32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
479 avio_wl32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
480 avio_wl32(pb, 1); /* I picture per GOP */
481 avio_wl32(pb, sc->p_per_gop);
482 avio_wl32(pb, sc->b_per_i_or_p);
483 if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
485 else if (st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO)
489 avio_wl32(pb, 0); /* reserved */
493 static int gxf_write_umf_media_timecode(AVIOContext *pb, GXFStreamContext *sc)
495 avio_wl32(pb, 1); /* non drop frame */
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 avio_wl32(pb, 0); /* reserved */
506 static int gxf_write_umf_media_dv(AVIOContext *pb, GXFStreamContext *sc)
510 for (i = 0; i < 8; i++) {
516 static int gxf_write_umf_media_audio(AVIOContext *pb, GXFStreamContext *sc)
518 avio_wl64(pb, av_double2int(1)); /* sound level to begin to */
519 avio_wl64(pb, av_double2int(1)); /* sound level to begin to */
520 avio_wl32(pb, 0); /* number of fields over which to ramp up sound level */
521 avio_wl32(pb, 0); /* number of fields over which to ramp down sound level */
522 avio_wl32(pb, 0); /* reserved */
523 avio_wl32(pb, 0); /* reserved */
527 static int gxf_write_umf_media_description(AVFormatContext *s)
529 GXFContext *gxf = s->priv_data;
530 AVIOContext *pb = s->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;
540 if (i == s->nb_streams)
541 sc = &gxf->timecode_track;
543 sc = s->streams[i]->priv_data;
545 startpos = avio_tell(pb);
546 avio_wl16(pb, 0); /* length */
547 avio_wl16(pb, sc->media_info);
548 avio_wl16(pb, 0); /* reserved */
549 avio_wl16(pb, 0); /* reserved */
550 avio_wl32(pb, gxf->nb_fields);
551 avio_wl32(pb, 0); /* attributes rw, ro */
552 avio_wl32(pb, 0); /* mark in */
553 avio_wl32(pb, gxf->nb_fields); /* mark out */
554 avio_write(pb, ES_NAME_PATTERN, strlen(ES_NAME_PATTERN));
555 avio_wb16(pb, sc->media_info);
556 for (j = strlen(ES_NAME_PATTERN)+2; j < 88; j++)
558 avio_wl32(pb, sc->track_type);
559 avio_wl32(pb, sc->sample_rate);
560 avio_wl32(pb, sc->sample_size);
561 avio_wl32(pb, 0); /* reserved */
563 if (sc == &gxf->timecode_track)
564 gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
566 AVStream *st = s->streams[i];
567 switch (st->codec->codec_id) {
568 case AV_CODEC_ID_MPEG1VIDEO:
569 case AV_CODEC_ID_MPEG2VIDEO:
570 gxf_write_umf_media_mpeg(pb, st);
572 case AV_CODEC_ID_PCM_S16LE:
573 gxf_write_umf_media_audio(pb, sc);
575 case AV_CODEC_ID_DVVIDEO:
576 gxf_write_umf_media_dv(pb, sc);
581 curpos = avio_tell(pb);
582 avio_seek(pb, startpos, SEEK_SET);
583 avio_wl16(pb, curpos - startpos);
584 avio_seek(pb, curpos, SEEK_SET);
586 return avio_tell(pb) - pos;
589 static int gxf_write_umf_packet(AVFormatContext *s)
591 GXFContext *gxf = s->priv_data;
592 AVIOContext *pb = s->pb;
593 int64_t pos = avio_tell(pb);
595 gxf_write_packet_header(pb, PKT_UMF);
598 avio_w8(pb, 3); /* first and last (only) packet */
599 avio_wb32(pb, gxf->umf_length); /* data length */
601 gxf->umf_start_offset = avio_tell(pb);
602 gxf_write_umf_payload(s);
603 gxf_write_umf_material_description(s);
604 gxf->umf_track_size = gxf_write_umf_track_description(s);
605 gxf->umf_media_size = gxf_write_umf_media_description(s);
606 gxf->umf_length = avio_tell(pb) - gxf->umf_start_offset;
607 return updatePacketSize(pb, pos);
610 static const int GXF_samples_per_frame[] = { 32768, 0 };
612 static void gxf_init_timecode_track(GXFStreamContext *sc, GXFStreamContext *vsc)
617 sc->media_type = vsc->sample_rate == 60 ? 7 : 8;
618 sc->sample_rate = vsc->sample_rate;
619 sc->media_info = ('T'<<8) | '0';
621 sc->frame_rate_index = vsc->frame_rate_index;
622 sc->lines_index = vsc->lines_index;
623 sc->sample_size = 16;
624 sc->fields = vsc->fields;
627 static int gxf_write_header(AVFormatContext *s)
629 AVIOContext *pb = s->pb;
630 GXFContext *gxf = s->priv_data;
631 GXFStreamContext *vsc = NULL;
632 uint8_t tracks[255] = {0};
633 int i, media_info = 0;
636 av_log(s, AV_LOG_ERROR, "gxf muxer does not support streamed output, patch welcome");
640 gxf->flags |= 0x00080000; /* material is simple clip */
641 for (i = 0; i < s->nb_streams; ++i) {
642 AVStream *st = s->streams[i];
643 GXFStreamContext *sc = av_mallocz(sizeof(*sc));
645 return AVERROR(ENOMEM);
648 sc->media_type = ff_codec_get_tag(gxf_media_types, st->codec->codec_id);
649 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
650 if (st->codec->codec_id != AV_CODEC_ID_PCM_S16LE) {
651 av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
654 if (st->codec->sample_rate != 48000) {
655 av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
658 if (st->codec->channels != 1) {
659 av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
663 sc->sample_rate = st->codec->sample_rate;
664 avpriv_set_pts_info(st, 64, 1, sc->sample_rate);
665 sc->sample_size = 16;
666 sc->frame_rate_index = -2;
667 sc->lines_index = -2;
670 gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
672 } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
674 av_log(s, AV_LOG_ERROR, "video stream must be the first track\n");
677 /* FIXME check from time_base ? */
678 if (st->codec->height == 480 || st->codec->height == 512) { /* NTSC or NTSC+VBI */
679 sc->frame_rate_index = 5;
680 sc->sample_rate = 60;
681 gxf->flags |= 0x00000080;
682 gxf->time_base = (AVRational){ 1001, 60000 };
683 } else if (st->codec->height == 576 || st->codec->height == 608) { /* PAL or PAL+VBI */
684 sc->frame_rate_index = 6;
686 sc->sample_rate = 50;
687 gxf->flags |= 0x00000040;
688 gxf->time_base = (AVRational){ 1, 50 };
690 av_log(s, AV_LOG_ERROR, "unsupported video resolution, "
691 "gxf muxer only accepts PAL or NTSC resolutions currently\n");
694 avpriv_set_pts_info(st, 64, gxf->time_base.num, gxf->time_base.den);
695 if (gxf_find_lines_index(st) < 0)
696 sc->lines_index = -1;
697 sc->sample_size = st->codec->bit_rate;
698 sc->fields = 2; /* interlaced */
702 switch (st->codec->codec_id) {
703 case AV_CODEC_ID_MJPEG:
705 gxf->flags |= 0x00004000;
708 case AV_CODEC_ID_MPEG1VIDEO:
713 case AV_CODEC_ID_MPEG2VIDEO:
714 sc->first_gop_closed = -1;
717 gxf->flags |= 0x00008000;
720 case AV_CODEC_ID_DVVIDEO:
721 if (st->codec->pix_fmt == PIX_FMT_YUV422P) {
724 gxf->flags |= 0x00002000;
728 gxf->flags |= 0x00001000;
733 av_log(s, AV_LOG_ERROR, "video codec not supported\n");
737 /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
738 sc->media_info = media_info<<8 | ('0'+tracks[media_info]++);
739 sc->order = s->nb_streams - st->index;
742 if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0)
745 gxf_init_timecode_track(&gxf->timecode_track, vsc);
746 gxf->flags |= 0x200000; // time code track is non-drop frame
748 gxf_write_map_packet(s, 0);
749 gxf_write_flt_packet(s);
750 gxf_write_umf_packet(s);
752 gxf->packet_count = 3;
758 static int gxf_write_eos_packet(AVIOContext *pb)
760 int64_t pos = avio_tell(pb);
762 gxf_write_packet_header(pb, PKT_EOS);
763 return updatePacketSize(pb, pos);
766 static int gxf_write_trailer(AVFormatContext *s)
768 GXFContext *gxf = s->priv_data;
769 AVIOContext *pb = s->pb;
773 ff_audio_interleave_close(s);
775 gxf_write_eos_packet(pb);
777 avio_seek(pb, 0, SEEK_SET);
778 /* overwrite map, flt and umf packets with new values */
779 gxf_write_map_packet(s, 1);
780 gxf_write_flt_packet(s);
781 gxf_write_umf_packet(s);
783 /* update duration in all map packets */
784 for (i = 1; i < gxf->map_offsets_nb; i++) {
785 avio_seek(pb, gxf->map_offsets[i], SEEK_SET);
786 gxf_write_map_packet(s, 1);
790 avio_seek(pb, end, SEEK_SET);
792 av_freep(&gxf->flt_entries);
793 av_freep(&gxf->map_offsets);
798 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
802 for(i=0; i<size-4 && c!=0x100; i++){
804 if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
805 sc->first_gop_closed= (buf[i+4]>>6)&1;
807 return (buf[i+1]>>3)&7;
810 static int gxf_write_media_preamble(AVFormatContext *s, AVPacket *pkt, int size)
812 GXFContext *gxf = s->priv_data;
813 AVIOContext *pb = s->pb;
814 AVStream *st = s->streams[pkt->stream_index];
815 GXFStreamContext *sc = st->priv_data;
817 /* If the video is frame-encoded, the frame numbers shall be represented by
818 * even field numbers.
819 * see SMPTE360M-2004 6.4.2.1.3 Media field number */
820 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
821 field_nb = gxf->nb_fields;
823 field_nb = av_rescale_rnd(pkt->dts, gxf->time_base.den,
824 (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
827 avio_w8(pb, sc->media_type);
828 avio_w8(pb, st->index);
829 avio_wb32(pb, field_nb);
830 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
832 avio_wb16(pb, size / 2);
833 } else if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
834 int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
835 if (frame_type == AV_PICTURE_TYPE_I) {
838 } else if (frame_type == AV_PICTURE_TYPE_B) {
846 } else if (st->codec->codec_id == AV_CODEC_ID_DVVIDEO) {
847 avio_w8(pb, size / 4096);
851 avio_wb32(pb, field_nb);
852 avio_w8(pb, 1); /* flags */
853 avio_w8(pb, 0); /* reserved */
857 static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
859 GXFContext *gxf = s->priv_data;
860 AVIOContext *pb = s->pb;
861 AVStream *st = s->streams[pkt->stream_index];
862 int64_t pos = avio_tell(pb);
864 int packet_start_offset = avio_tell(pb) / 1024;
866 gxf_write_packet_header(pb, PKT_MEDIA);
867 if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
868 padding = 4 - pkt->size % 4;
869 else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
870 padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
871 gxf_write_media_preamble(s, pkt, pkt->size + padding);
872 avio_write(pb, pkt->data, pkt->size);
873 gxf_write_padding(pb, padding);
875 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
876 if (!(gxf->flt_entries_nb % 500)) {
877 gxf->flt_entries = av_realloc(gxf->flt_entries,
878 (gxf->flt_entries_nb+500)*sizeof(*gxf->flt_entries));
879 if (!gxf->flt_entries) {
880 av_log(s, AV_LOG_ERROR, "could not reallocate flt entries\n");
884 gxf->flt_entries[gxf->flt_entries_nb++] = packet_start_offset;
885 gxf->nb_fields += 2; // count fields
888 updatePacketSize(pb, pos);
891 if (gxf->packet_count == 100) {
892 gxf_write_map_packet(s, 0);
893 gxf->packet_count = 0;
901 static int gxf_compare_field_nb(AVFormatContext *s, AVPacket *next, AVPacket *cur)
903 GXFContext *gxf = s->priv_data;
904 AVPacket *pkt[2] = { cur, next };
906 GXFStreamContext *sc[2];
908 for (i = 0; i < 2; i++) {
909 AVStream *st = s->streams[pkt[i]->stream_index];
910 sc[i] = st->priv_data;
911 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
912 field_nb[i] = av_rescale_rnd(pkt[i]->dts, gxf->time_base.den,
913 (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
914 field_nb[i] &= ~1; // compare against even field number because audio must be before video
916 field_nb[i] = pkt[i]->dts; // dts are field based
919 return field_nb[1] > field_nb[0] ||
920 (field_nb[1] == field_nb[0] && sc[1]->order > sc[0]->order);
923 static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
925 if (pkt && s->streams[pkt->stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
926 pkt->duration = 2; // enforce 2 fields
927 return ff_audio_rechunk_interleave(s, out, pkt, flush,
928 ff_interleave_packet_per_dts, gxf_compare_field_nb);
931 AVOutputFormat ff_gxf_muxer = {
933 .long_name = NULL_IF_CONFIG_SMALL("GXF (General eXchange Format)"),
935 .priv_data_size = sizeof(GXFContext),
936 .audio_codec = AV_CODEC_ID_PCM_S16LE,
937 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
938 .write_header = gxf_write_header,
939 .write_packet = gxf_write_packet,
940 .write_trailer = gxf_write_trailer,
941 .interleave_packet = gxf_interleave_packet,