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"
27 #include "audiointerleave.h"
29 #define GXF_AUDIO_PACKET_SIZE 65536
31 typedef struct GXFStreamContext {
32 AudioInterleaveContext aic;
45 int b_per_i_or_p; ///< number of B frames per I frame or P frame
47 unsigned order; ///< interleaving order
50 typedef struct GXFContext {
52 uint16_t audio_tracks;
54 int64_t creation_time;
55 uint32_t umf_start_offset;
56 uint32_t umf_track_offset;
57 uint32_t umf_media_offset;
59 uint16_t umf_track_size;
60 uint16_t umf_media_size;
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;
74 { 480, 1 }, /* NTSC */
75 { 512, 1 }, /* NTSC + VBI */
77 { 608, 2 }, /* PAL + VBI */
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 },
101 #define SERVER_PATH "EXT:/PDR/default/"
102 #define ES_NAME_PATTERN "EXT:/PDR/default/ES."
104 static int gxf_find_lines_index(AVStream *st)
106 GXFStreamContext *sc = st->priv_data;
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;
118 static void gxf_write_padding(AVIOContext *pb, int64_t to_pad)
120 for (; to_pad > 0; to_pad--) {
125 static int64_t updatePacketSize(AVIOContext *pb, int64_t pos)
130 size = avio_tell(pb) - pos;
132 gxf_write_padding(pb, 4 - size % 4);
133 size = avio_tell(pb) - pos;
135 curpos = avio_tell(pb);
136 avio_seek(pb, pos + 6, SEEK_SET);
138 avio_seek(pb, curpos, SEEK_SET);
142 static int64_t updateSize(AVIOContext *pb, int64_t pos)
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);
153 static void gxf_write_packet_header(AVIOContext *pb, GXFPktType type)
155 avio_wb32(pb, 0); /* packet leader for synchro */
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 */
164 static int gxf_write_mpeg_auxiliary(AVIOContext *pb, AVStream *st)
166 GXFStreamContext *sc = st->priv_data;
168 int size, starting_line;
171 sc->p_per_gop = sc->pframes / sc->iframes;
172 if (sc->pframes % sc->iframes)
175 sc->b_per_i_or_p = sc->bframes / sc->pframes;
176 if (sc->bframes % sc->pframes)
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 */
184 if (st->codec->height == 512 || st->codec->height == 608)
185 starting_line = 7; // VBI
186 else if (st->codec->height == 480)
189 starting_line = 23; // default PAL
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);
202 static int gxf_write_timecode_auxiliary(AVIOContext *pb, GXFStreamContext *sc)
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 */
213 static int gxf_write_track_description(AVFormatContext *s, GXFStreamContext *sc, int index)
215 AVIOContext *pb = s->pb;
217 int mpeg = sc->track_type == 4 || sc->track_type == 9;
219 /* track description section */
220 avio_w8(pb, sc->media_type + 0x80);
221 avio_w8(pb, index + 0xC0);
224 avio_wb16(pb, 0); /* size */
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);
234 /* auxiliary information */
235 avio_w8(pb, TRACK_AUX);
237 if (sc->track_type == 3)
238 gxf_write_timecode_auxiliary(pb, sc);
243 /* file system version */
244 avio_w8(pb, TRACK_VER);
249 gxf_write_mpeg_auxiliary(pb, s->streams[index]);
252 avio_w8(pb, TRACK_FPS);
254 avio_wb32(pb, sc->frame_rate_index);
256 /* lines per frame */
257 avio_w8(pb, TRACK_LINES);
259 avio_wb32(pb, sc->lines_index);
261 /* fields per frame */
262 avio_w8(pb, TRACK_FPF);
264 avio_wb32(pb, sc->fields);
266 return updateSize(pb, pos);
269 static int gxf_write_material_data_section(AVFormatContext *s)
271 GXFContext *gxf = s->priv_data;
272 AVIOContext *pb = s->pb;
275 const char *filename = strrchr(s->filename, '/');
278 avio_wb16(pb, 0); /* size */
284 filename = s->filename;
285 len = strlen(filename);
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);
294 avio_w8(pb, MAT_FIRST_FIELD);
299 avio_w8(pb, MAT_LAST_FIELD);
301 avio_wb32(pb, gxf->nb_fields);
304 avio_w8(pb, MAT_MARK_IN);
308 avio_w8(pb, MAT_MARK_OUT);
310 avio_wb32(pb, gxf->nb_fields);
313 avio_w8(pb, MAT_SIZE);
315 avio_wb32(pb, avio_size(pb) / 1024);
317 return updateSize(pb, pos);
320 static int gxf_write_track_description_section(AVFormatContext *s)
322 GXFContext *gxf = s->priv_data;
323 AVIOContext *pb = s->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);
332 gxf_write_track_description(s, &gxf->timecode_track, s->nb_streams);
334 return updateSize(pb, pos);
337 static int gxf_write_map_packet(AVFormatContext *s, int rewrite)
339 GXFContext *gxf = s->priv_data;
340 AVIOContext *pb = s->pb;
341 int64_t pos = avio_tell(pb);
344 if (!(gxf->map_offsets_nb % 30)) {
346 if ((err = av_reallocp_array(&gxf->map_offsets,
347 gxf->map_offsets_nb + 30,
348 sizeof(*gxf->map_offsets))) < 0) {
349 gxf->map_offsets_nb = 0;
350 av_log(s, AV_LOG_ERROR, "could not realloc map offsets\n");
354 gxf->map_offsets[gxf->map_offsets_nb++] = pos; // do not increment here
357 gxf_write_packet_header(pb, PKT_MAP);
360 avio_w8(pb, 0xE0); /* version */
361 avio_w8(pb, 0xFF); /* reserved */
363 gxf_write_material_data_section(s);
364 gxf_write_track_description_section(s);
366 return updatePacketSize(pb, pos);
369 static int gxf_write_flt_packet(AVFormatContext *s)
371 GXFContext *gxf = s->priv_data;
372 AVIOContext *pb = s->pb;
373 int64_t pos = avio_tell(pb);
374 int fields_per_flt = (gxf->nb_fields+1) / 1000 + 1;
375 int flt_entries = gxf->nb_fields / fields_per_flt;
378 gxf_write_packet_header(pb, PKT_FLT);
380 avio_wl32(pb, fields_per_flt); /* number of fields */
381 avio_wl32(pb, flt_entries); /* number of active flt entries */
383 if (gxf->flt_entries) {
384 for (i = 0; i < flt_entries; i++)
385 avio_wl32(pb, gxf->flt_entries[(i*fields_per_flt)>>1]);
388 for (; i < 1000; i++)
391 return updatePacketSize(pb, pos);
394 static int gxf_write_umf_material_description(AVFormatContext *s)
396 GXFContext *gxf = s->priv_data;
397 AVIOContext *pb = s->pb;
398 int timecode_base = gxf->time_base.den == 60000 ? 60 : 50;
399 int64_t timestamp = 0;
400 AVDictionaryEntry *t;
403 if (t = av_dict_get(s->metadata, "creation_time", NULL, 0))
404 timestamp = ff_iso8601_to_unix_time(t->value);
408 gxf->nb_fields / (timecode_base * 3600) % 24 << 24 | // hours
409 gxf->nb_fields / (timecode_base * 60) % 60 << 16 | // minutes
410 gxf->nb_fields / timecode_base % 60 << 8 | // seconds
411 gxf->nb_fields % timecode_base; // fields
413 avio_wl32(pb, gxf->flags);
414 avio_wl32(pb, gxf->nb_fields); /* length of the longest track */
415 avio_wl32(pb, gxf->nb_fields); /* length of the shortest track */
416 avio_wl32(pb, 0); /* mark in */
417 avio_wl32(pb, gxf->nb_fields); /* mark out */
418 avio_wl32(pb, 0); /* timecode mark in */
419 avio_wl32(pb, timecode); /* timecode mark out */
420 avio_wl64(pb, timestamp); /* modification time */
421 avio_wl64(pb, timestamp); /* creation time */
422 avio_wl16(pb, 0); /* reserved */
423 avio_wl16(pb, 0); /* reserved */
424 avio_wl16(pb, gxf->audio_tracks);
425 avio_wl16(pb, 1); /* timecode track count */
426 avio_wl16(pb, 0); /* reserved */
427 avio_wl16(pb, gxf->mpeg_tracks);
431 static int gxf_write_umf_payload(AVFormatContext *s)
433 GXFContext *gxf = s->priv_data;
434 AVIOContext *pb = s->pb;
436 avio_wl32(pb, gxf->umf_length); /* total length of the umf data */
437 avio_wl32(pb, 3); /* version */
438 avio_wl32(pb, s->nb_streams+1);
439 avio_wl32(pb, gxf->umf_track_offset); /* umf track section offset */
440 avio_wl32(pb, gxf->umf_track_size);
441 avio_wl32(pb, s->nb_streams+1);
442 avio_wl32(pb, gxf->umf_media_offset);
443 avio_wl32(pb, gxf->umf_media_size);
444 avio_wl32(pb, gxf->umf_length); /* user data offset */
445 avio_wl32(pb, 0); /* user data size */
446 avio_wl32(pb, 0); /* reserved */
447 avio_wl32(pb, 0); /* reserved */
451 static int gxf_write_umf_track_description(AVFormatContext *s)
453 AVIOContext *pb = s->pb;
454 GXFContext *gxf = s->priv_data;
455 int64_t pos = avio_tell(pb);
458 gxf->umf_track_offset = pos - gxf->umf_start_offset;
459 for (i = 0; i < s->nb_streams; ++i) {
460 GXFStreamContext *sc = s->streams[i]->priv_data;
461 avio_wl16(pb, sc->media_info);
465 avio_wl16(pb, gxf->timecode_track.media_info);
468 return avio_tell(pb) - pos;
471 static int gxf_write_umf_media_mpeg(AVIOContext *pb, AVStream *st)
473 GXFStreamContext *sc = st->priv_data;
475 if (st->codec->pix_fmt == AV_PIX_FMT_YUV422P)
478 avio_wl32(pb, 1); /* default to 420 */
479 avio_wl32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
480 avio_wl32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
481 avio_wl32(pb, 1); /* I picture per GOP */
482 avio_wl32(pb, sc->p_per_gop);
483 avio_wl32(pb, sc->b_per_i_or_p);
484 if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
486 else if (st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO)
490 avio_wl32(pb, 0); /* reserved */
494 static int gxf_write_umf_media_timecode(AVIOContext *pb, GXFStreamContext *sc)
496 avio_wl32(pb, 1); /* non drop frame */
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 */
503 avio_wl32(pb, 0); /* reserved */
507 static int gxf_write_umf_media_dv(AVIOContext *pb, GXFStreamContext *sc)
511 for (i = 0; i < 8; i++) {
517 static int gxf_write_umf_media_audio(AVIOContext *pb, GXFStreamContext *sc)
519 avio_wl64(pb, av_double2int(1)); /* sound level to begin to */
520 avio_wl64(pb, av_double2int(1)); /* sound level to begin to */
521 avio_wl32(pb, 0); /* number of fields over which to ramp up sound level */
522 avio_wl32(pb, 0); /* number of fields over which to ramp down sound level */
523 avio_wl32(pb, 0); /* reserved */
524 avio_wl32(pb, 0); /* reserved */
528 static int gxf_write_umf_media_description(AVFormatContext *s)
530 GXFContext *gxf = s->priv_data;
531 AVIOContext *pb = s->pb;
536 gxf->umf_media_offset = pos - gxf->umf_start_offset;
537 for (i = 0; i <= s->nb_streams; ++i) {
538 GXFStreamContext *sc;
539 int64_t startpos, curpos;
541 if (i == s->nb_streams)
542 sc = &gxf->timecode_track;
544 sc = s->streams[i]->priv_data;
546 startpos = avio_tell(pb);
547 avio_wl16(pb, 0); /* length */
548 avio_wl16(pb, sc->media_info);
549 avio_wl16(pb, 0); /* reserved */
550 avio_wl16(pb, 0); /* reserved */
551 avio_wl32(pb, gxf->nb_fields);
552 avio_wl32(pb, 0); /* attributes rw, ro */
553 avio_wl32(pb, 0); /* mark in */
554 avio_wl32(pb, gxf->nb_fields); /* mark out */
555 avio_write(pb, ES_NAME_PATTERN, strlen(ES_NAME_PATTERN));
556 avio_wb16(pb, sc->media_info);
557 for (j = strlen(ES_NAME_PATTERN)+2; j < 88; j++)
559 avio_wl32(pb, sc->track_type);
560 avio_wl32(pb, sc->sample_rate);
561 avio_wl32(pb, sc->sample_size);
562 avio_wl32(pb, 0); /* reserved */
564 if (sc == &gxf->timecode_track)
565 gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
567 AVStream *st = s->streams[i];
568 switch (st->codec->codec_id) {
569 case AV_CODEC_ID_MPEG1VIDEO:
570 case AV_CODEC_ID_MPEG2VIDEO:
571 gxf_write_umf_media_mpeg(pb, st);
573 case AV_CODEC_ID_PCM_S16LE:
574 gxf_write_umf_media_audio(pb, sc);
576 case AV_CODEC_ID_DVVIDEO:
577 gxf_write_umf_media_dv(pb, sc);
582 curpos = avio_tell(pb);
583 avio_seek(pb, startpos, SEEK_SET);
584 avio_wl16(pb, curpos - startpos);
585 avio_seek(pb, curpos, SEEK_SET);
587 return avio_tell(pb) - pos;
590 static int gxf_write_umf_packet(AVFormatContext *s)
592 GXFContext *gxf = s->priv_data;
593 AVIOContext *pb = s->pb;
594 int64_t pos = avio_tell(pb);
596 gxf_write_packet_header(pb, PKT_UMF);
599 avio_w8(pb, 3); /* first and last (only) packet */
600 avio_wb32(pb, gxf->umf_length); /* data length */
602 gxf->umf_start_offset = avio_tell(pb);
603 gxf_write_umf_payload(s);
604 gxf_write_umf_material_description(s);
605 gxf->umf_track_size = gxf_write_umf_track_description(s);
606 gxf->umf_media_size = gxf_write_umf_media_description(s);
607 gxf->umf_length = avio_tell(pb) - gxf->umf_start_offset;
608 return updatePacketSize(pb, pos);
611 static const int GXF_samples_per_frame[] = { 32768, 0 };
613 static void gxf_init_timecode_track(GXFStreamContext *sc, GXFStreamContext *vsc)
618 sc->media_type = vsc->sample_rate == 60 ? 7 : 8;
619 sc->sample_rate = vsc->sample_rate;
620 sc->media_info = ('T'<<8) | '0';
622 sc->frame_rate_index = vsc->frame_rate_index;
623 sc->lines_index = vsc->lines_index;
624 sc->sample_size = 16;
625 sc->fields = vsc->fields;
628 static int gxf_write_header(AVFormatContext *s)
630 AVIOContext *pb = s->pb;
631 GXFContext *gxf = s->priv_data;
632 GXFStreamContext *vsc = NULL;
633 uint8_t tracks[255] = {0};
634 int i, media_info = 0;
637 av_log(s, AV_LOG_ERROR, "gxf muxer does not support streamed output, patch welcome");
641 gxf->flags |= 0x00080000; /* material is simple clip */
642 for (i = 0; i < s->nb_streams; ++i) {
643 AVStream *st = s->streams[i];
644 GXFStreamContext *sc = av_mallocz(sizeof(*sc));
646 return AVERROR(ENOMEM);
649 sc->media_type = ff_codec_get_tag(gxf_media_types, st->codec->codec_id);
650 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
651 if (st->codec->codec_id != AV_CODEC_ID_PCM_S16LE) {
652 av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
655 if (st->codec->sample_rate != 48000) {
656 av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
659 if (st->codec->channels != 1) {
660 av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
664 sc->sample_rate = st->codec->sample_rate;
665 avpriv_set_pts_info(st, 64, 1, sc->sample_rate);
666 sc->sample_size = 16;
667 sc->frame_rate_index = -2;
668 sc->lines_index = -2;
671 gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
673 } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
675 av_log(s, AV_LOG_ERROR, "video stream must be the first track\n");
678 /* FIXME check from time_base ? */
679 if (st->codec->height == 480 || st->codec->height == 512) { /* NTSC or NTSC+VBI */
680 sc->frame_rate_index = 5;
681 sc->sample_rate = 60;
682 gxf->flags |= 0x00000080;
683 gxf->time_base = (AVRational){ 1001, 60000 };
684 } else if (st->codec->height == 576 || st->codec->height == 608) { /* PAL or PAL+VBI */
685 sc->frame_rate_index = 6;
687 sc->sample_rate = 50;
688 gxf->flags |= 0x00000040;
689 gxf->time_base = (AVRational){ 1, 50 };
691 av_log(s, AV_LOG_ERROR, "unsupported video resolution, "
692 "gxf muxer only accepts PAL or NTSC resolutions currently\n");
695 avpriv_set_pts_info(st, 64, gxf->time_base.num, gxf->time_base.den);
696 if (gxf_find_lines_index(st) < 0)
697 sc->lines_index = -1;
698 sc->sample_size = st->codec->bit_rate;
699 sc->fields = 2; /* interlaced */
703 switch (st->codec->codec_id) {
704 case AV_CODEC_ID_MJPEG:
706 gxf->flags |= 0x00004000;
709 case AV_CODEC_ID_MPEG1VIDEO:
714 case AV_CODEC_ID_MPEG2VIDEO:
715 sc->first_gop_closed = -1;
718 gxf->flags |= 0x00008000;
721 case AV_CODEC_ID_DVVIDEO:
722 if (st->codec->pix_fmt == AV_PIX_FMT_YUV422P) {
725 gxf->flags |= 0x00002000;
729 gxf->flags |= 0x00001000;
734 av_log(s, AV_LOG_ERROR, "video codec not supported\n");
738 /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
739 sc->media_info = media_info<<8 | ('0'+tracks[media_info]++);
740 sc->order = s->nb_streams - st->index;
743 if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0)
746 gxf_init_timecode_track(&gxf->timecode_track, vsc);
747 gxf->flags |= 0x200000; // time code track is non-drop frame
749 gxf_write_map_packet(s, 0);
750 gxf_write_flt_packet(s);
751 gxf_write_umf_packet(s);
753 gxf->packet_count = 3;
759 static int gxf_write_eos_packet(AVIOContext *pb)
761 int64_t pos = avio_tell(pb);
763 gxf_write_packet_header(pb, PKT_EOS);
764 return updatePacketSize(pb, pos);
767 static int gxf_write_trailer(AVFormatContext *s)
769 GXFContext *gxf = s->priv_data;
770 AVIOContext *pb = s->pb;
774 ff_audio_interleave_close(s);
776 gxf_write_eos_packet(pb);
778 avio_seek(pb, 0, SEEK_SET);
779 /* overwrite map, flt and umf packets with new values */
780 gxf_write_map_packet(s, 1);
781 gxf_write_flt_packet(s);
782 gxf_write_umf_packet(s);
784 /* update duration in all map packets */
785 for (i = 1; i < gxf->map_offsets_nb; i++) {
786 avio_seek(pb, gxf->map_offsets[i], SEEK_SET);
787 gxf_write_map_packet(s, 1);
791 avio_seek(pb, end, SEEK_SET);
793 av_freep(&gxf->flt_entries);
794 av_freep(&gxf->map_offsets);
799 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
803 for(i=0; i<size-4 && c!=0x100; i++){
805 if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
806 sc->first_gop_closed= (buf[i+4]>>6)&1;
808 return (buf[i+1]>>3)&7;
811 static int gxf_write_media_preamble(AVFormatContext *s, AVPacket *pkt, int size)
813 GXFContext *gxf = s->priv_data;
814 AVIOContext *pb = s->pb;
815 AVStream *st = s->streams[pkt->stream_index];
816 GXFStreamContext *sc = st->priv_data;
818 /* If the video is frame-encoded, the frame numbers shall be represented by
819 * even field numbers.
820 * see SMPTE360M-2004 6.4.2.1.3 Media field number */
821 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
822 field_nb = gxf->nb_fields;
824 field_nb = av_rescale_rnd(pkt->dts, gxf->time_base.den,
825 (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
828 avio_w8(pb, sc->media_type);
829 avio_w8(pb, st->index);
830 avio_wb32(pb, field_nb);
831 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
833 avio_wb16(pb, size / 2);
834 } else if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
835 int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
836 if (frame_type == AV_PICTURE_TYPE_I) {
839 } else if (frame_type == AV_PICTURE_TYPE_B) {
847 } else if (st->codec->codec_id == AV_CODEC_ID_DVVIDEO) {
848 avio_w8(pb, size / 4096);
852 avio_wb32(pb, field_nb);
853 avio_w8(pb, 1); /* flags */
854 avio_w8(pb, 0); /* reserved */
858 static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
860 GXFContext *gxf = s->priv_data;
861 AVIOContext *pb = s->pb;
862 AVStream *st = s->streams[pkt->stream_index];
863 int64_t pos = avio_tell(pb);
865 int packet_start_offset = avio_tell(pb) / 1024;
867 gxf_write_packet_header(pb, PKT_MEDIA);
868 if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
869 padding = 4 - pkt->size % 4;
870 else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
871 padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
872 gxf_write_media_preamble(s, pkt, pkt->size + padding);
873 avio_write(pb, pkt->data, pkt->size);
874 gxf_write_padding(pb, padding);
876 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
877 if (!(gxf->flt_entries_nb % 500)) {
879 if ((err = av_reallocp_array(&gxf->flt_entries,
880 gxf->flt_entries_nb + 500,
881 sizeof(*gxf->flt_entries))) < 0) {
882 gxf->flt_entries_nb = 0;
883 av_log(s, AV_LOG_ERROR, "could not reallocate flt entries\n");
887 gxf->flt_entries[gxf->flt_entries_nb++] = packet_start_offset;
888 gxf->nb_fields += 2; // count fields
891 updatePacketSize(pb, pos);
894 if (gxf->packet_count == 100) {
895 gxf_write_map_packet(s, 0);
896 gxf->packet_count = 0;
902 static int gxf_compare_field_nb(AVFormatContext *s, AVPacket *next, AVPacket *cur)
904 GXFContext *gxf = s->priv_data;
905 AVPacket *pkt[2] = { cur, next };
907 GXFStreamContext *sc[2];
909 for (i = 0; i < 2; i++) {
910 AVStream *st = s->streams[pkt[i]->stream_index];
911 sc[i] = st->priv_data;
912 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
913 field_nb[i] = av_rescale_rnd(pkt[i]->dts, gxf->time_base.den,
914 (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
915 field_nb[i] &= ~1; // compare against even field number because audio must be before video
917 field_nb[i] = pkt[i]->dts; // dts are field based
920 return field_nb[1] > field_nb[0] ||
921 (field_nb[1] == field_nb[0] && sc[1]->order > sc[0]->order);
924 static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
926 if (pkt && s->streams[pkt->stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
927 pkt->duration = 2; // enforce 2 fields
928 return ff_audio_rechunk_interleave(s, out, pkt, flush,
929 ff_interleave_packet_per_dts, gxf_compare_field_nb);
932 AVOutputFormat ff_gxf_muxer = {
934 .long_name = NULL_IF_CONFIG_SMALL("GXF (General eXchange Format)"),
936 .priv_data_size = sizeof(GXFContext),
937 .audio_codec = AV_CODEC_ID_PCM_S16LE,
938 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
939 .write_header = gxf_write_header,
940 .write_packet = gxf_write_packet,
941 .write_trailer = gxf_write_trailer,
942 .interleave_packet = gxf_interleave_packet,