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)) {
345 gxf->map_offsets = av_realloc(gxf->map_offsets,
346 (gxf->map_offsets_nb+30)*sizeof(*gxf->map_offsets));
347 if (!gxf->map_offsets) {
348 av_log(s, AV_LOG_ERROR, "could not realloc map offsets\n");
352 gxf->map_offsets[gxf->map_offsets_nb++] = pos; // do not increment here
355 gxf_write_packet_header(pb, PKT_MAP);
358 avio_w8(pb, 0xE0); /* version */
359 avio_w8(pb, 0xFF); /* reserved */
361 gxf_write_material_data_section(s);
362 gxf_write_track_description_section(s);
364 return updatePacketSize(pb, pos);
367 static int gxf_write_flt_packet(AVFormatContext *s)
369 GXFContext *gxf = s->priv_data;
370 AVIOContext *pb = s->pb;
371 int64_t pos = avio_tell(pb);
372 int fields_per_flt = (gxf->nb_fields+1) / 1000 + 1;
373 int flt_entries = gxf->nb_fields / fields_per_flt;
376 gxf_write_packet_header(pb, PKT_FLT);
378 avio_wl32(pb, fields_per_flt); /* number of fields */
379 avio_wl32(pb, flt_entries); /* number of active flt entries */
381 if (gxf->flt_entries) {
382 for (i = 0; i < flt_entries; i++)
383 avio_wl32(pb, gxf->flt_entries[(i*fields_per_flt)>>1]);
386 for (; i < 1000; i++)
389 return updatePacketSize(pb, pos);
392 static int gxf_write_umf_material_description(AVFormatContext *s)
394 GXFContext *gxf = s->priv_data;
395 AVIOContext *pb = s->pb;
396 int timecode_base = gxf->time_base.den == 60000 ? 60 : 50;
397 int64_t timestamp = 0;
398 AVDictionaryEntry *t;
401 if (t = av_dict_get(s->metadata, "creation_time", NULL, 0))
402 timestamp = ff_iso8601_to_unix_time(t->value);
406 gxf->nb_fields / (timecode_base * 3600) % 24 << 24 | // hours
407 gxf->nb_fields / (timecode_base * 60) % 60 << 16 | // minutes
408 gxf->nb_fields / timecode_base % 60 << 8 | // seconds
409 gxf->nb_fields % timecode_base; // fields
411 avio_wl32(pb, gxf->flags);
412 avio_wl32(pb, gxf->nb_fields); /* length of the longest track */
413 avio_wl32(pb, gxf->nb_fields); /* length of the shortest track */
414 avio_wl32(pb, 0); /* mark in */
415 avio_wl32(pb, gxf->nb_fields); /* mark out */
416 avio_wl32(pb, 0); /* timecode mark in */
417 avio_wl32(pb, timecode); /* timecode mark out */
418 avio_wl64(pb, timestamp); /* modification time */
419 avio_wl64(pb, timestamp); /* creation time */
420 avio_wl16(pb, 0); /* reserved */
421 avio_wl16(pb, 0); /* reserved */
422 avio_wl16(pb, gxf->audio_tracks);
423 avio_wl16(pb, 1); /* timecode track count */
424 avio_wl16(pb, 0); /* reserved */
425 avio_wl16(pb, gxf->mpeg_tracks);
429 static int gxf_write_umf_payload(AVFormatContext *s)
431 GXFContext *gxf = s->priv_data;
432 AVIOContext *pb = s->pb;
434 avio_wl32(pb, gxf->umf_length); /* total length of the umf data */
435 avio_wl32(pb, 3); /* version */
436 avio_wl32(pb, s->nb_streams+1);
437 avio_wl32(pb, gxf->umf_track_offset); /* umf track section offset */
438 avio_wl32(pb, gxf->umf_track_size);
439 avio_wl32(pb, s->nb_streams+1);
440 avio_wl32(pb, gxf->umf_media_offset);
441 avio_wl32(pb, gxf->umf_media_size);
442 avio_wl32(pb, gxf->umf_length); /* user data offset */
443 avio_wl32(pb, 0); /* user data size */
444 avio_wl32(pb, 0); /* reserved */
445 avio_wl32(pb, 0); /* reserved */
449 static int gxf_write_umf_track_description(AVFormatContext *s)
451 AVIOContext *pb = s->pb;
452 GXFContext *gxf = s->priv_data;
453 int64_t pos = avio_tell(pb);
456 gxf->umf_track_offset = pos - gxf->umf_start_offset;
457 for (i = 0; i < s->nb_streams; ++i) {
458 GXFStreamContext *sc = s->streams[i]->priv_data;
459 avio_wl16(pb, sc->media_info);
463 avio_wl16(pb, gxf->timecode_track.media_info);
466 return avio_tell(pb) - pos;
469 static int gxf_write_umf_media_mpeg(AVIOContext *pb, AVStream *st)
471 GXFStreamContext *sc = st->priv_data;
473 if (st->codec->pix_fmt == AV_PIX_FMT_YUV422P)
476 avio_wl32(pb, 1); /* default to 420 */
477 avio_wl32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
478 avio_wl32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
479 avio_wl32(pb, 1); /* I picture per GOP */
480 avio_wl32(pb, sc->p_per_gop);
481 avio_wl32(pb, sc->b_per_i_or_p);
482 if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
484 else if (st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO)
488 avio_wl32(pb, 0); /* reserved */
492 static int gxf_write_umf_media_timecode(AVIOContext *pb, GXFStreamContext *sc)
494 avio_wl32(pb, 1); /* non drop frame */
495 avio_wl32(pb, 0); /* reserved */
496 avio_wl32(pb, 0); /* reserved */
497 avio_wl32(pb, 0); /* reserved */
498 avio_wl32(pb, 0); /* reserved */
499 avio_wl32(pb, 0); /* reserved */
500 avio_wl32(pb, 0); /* reserved */
501 avio_wl32(pb, 0); /* reserved */
505 static int gxf_write_umf_media_dv(AVIOContext *pb, GXFStreamContext *sc)
509 for (i = 0; i < 8; i++) {
515 static int gxf_write_umf_media_audio(AVIOContext *pb, GXFStreamContext *sc)
517 avio_wl64(pb, av_double2int(1)); /* sound level to begin to */
518 avio_wl64(pb, av_double2int(1)); /* sound level to begin to */
519 avio_wl32(pb, 0); /* number of fields over which to ramp up sound level */
520 avio_wl32(pb, 0); /* number of fields over which to ramp down sound level */
521 avio_wl32(pb, 0); /* reserved */
522 avio_wl32(pb, 0); /* reserved */
526 static int gxf_write_umf_media_description(AVFormatContext *s)
528 GXFContext *gxf = s->priv_data;
529 AVIOContext *pb = s->pb;
534 gxf->umf_media_offset = pos - gxf->umf_start_offset;
535 for (i = 0; i <= s->nb_streams; ++i) {
536 GXFStreamContext *sc;
537 int64_t startpos, curpos;
539 if (i == s->nb_streams)
540 sc = &gxf->timecode_track;
542 sc = s->streams[i]->priv_data;
544 startpos = avio_tell(pb);
545 avio_wl16(pb, 0); /* length */
546 avio_wl16(pb, sc->media_info);
547 avio_wl16(pb, 0); /* reserved */
548 avio_wl16(pb, 0); /* reserved */
549 avio_wl32(pb, gxf->nb_fields);
550 avio_wl32(pb, 0); /* attributes rw, ro */
551 avio_wl32(pb, 0); /* mark in */
552 avio_wl32(pb, gxf->nb_fields); /* mark out */
553 avio_write(pb, ES_NAME_PATTERN, strlen(ES_NAME_PATTERN));
554 avio_wb16(pb, sc->media_info);
555 for (j = strlen(ES_NAME_PATTERN)+2; j < 88; j++)
557 avio_wl32(pb, sc->track_type);
558 avio_wl32(pb, sc->sample_rate);
559 avio_wl32(pb, sc->sample_size);
560 avio_wl32(pb, 0); /* reserved */
562 if (sc == &gxf->timecode_track)
563 gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
565 AVStream *st = s->streams[i];
566 switch (st->codec->codec_id) {
567 case AV_CODEC_ID_MPEG1VIDEO:
568 case AV_CODEC_ID_MPEG2VIDEO:
569 gxf_write_umf_media_mpeg(pb, st);
571 case AV_CODEC_ID_PCM_S16LE:
572 gxf_write_umf_media_audio(pb, sc);
574 case AV_CODEC_ID_DVVIDEO:
575 gxf_write_umf_media_dv(pb, sc);
580 curpos = avio_tell(pb);
581 avio_seek(pb, startpos, SEEK_SET);
582 avio_wl16(pb, curpos - startpos);
583 avio_seek(pb, curpos, SEEK_SET);
585 return avio_tell(pb) - pos;
588 static int gxf_write_umf_packet(AVFormatContext *s)
590 GXFContext *gxf = s->priv_data;
591 AVIOContext *pb = s->pb;
592 int64_t pos = avio_tell(pb);
594 gxf_write_packet_header(pb, PKT_UMF);
597 avio_w8(pb, 3); /* first and last (only) packet */
598 avio_wb32(pb, gxf->umf_length); /* data length */
600 gxf->umf_start_offset = avio_tell(pb);
601 gxf_write_umf_payload(s);
602 gxf_write_umf_material_description(s);
603 gxf->umf_track_size = gxf_write_umf_track_description(s);
604 gxf->umf_media_size = gxf_write_umf_media_description(s);
605 gxf->umf_length = avio_tell(pb) - gxf->umf_start_offset;
606 return updatePacketSize(pb, pos);
609 static const int GXF_samples_per_frame[] = { 32768, 0 };
611 static void gxf_init_timecode_track(GXFStreamContext *sc, GXFStreamContext *vsc)
616 sc->media_type = vsc->sample_rate == 60 ? 7 : 8;
617 sc->sample_rate = vsc->sample_rate;
618 sc->media_info = ('T'<<8) | '0';
620 sc->frame_rate_index = vsc->frame_rate_index;
621 sc->lines_index = vsc->lines_index;
622 sc->sample_size = 16;
623 sc->fields = vsc->fields;
626 static int gxf_write_header(AVFormatContext *s)
628 AVIOContext *pb = s->pb;
629 GXFContext *gxf = s->priv_data;
630 GXFStreamContext *vsc = NULL;
631 uint8_t tracks[255] = {0};
632 int i, media_info = 0;
635 av_log(s, AV_LOG_ERROR, "gxf muxer does not support streamed output, patch welcome");
639 gxf->flags |= 0x00080000; /* material is simple clip */
640 for (i = 0; i < s->nb_streams; ++i) {
641 AVStream *st = s->streams[i];
642 GXFStreamContext *sc = av_mallocz(sizeof(*sc));
644 return AVERROR(ENOMEM);
647 sc->media_type = ff_codec_get_tag(gxf_media_types, st->codec->codec_id);
648 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
649 if (st->codec->codec_id != AV_CODEC_ID_PCM_S16LE) {
650 av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
653 if (st->codec->sample_rate != 48000) {
654 av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
657 if (st->codec->channels != 1) {
658 av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
662 sc->sample_rate = st->codec->sample_rate;
663 avpriv_set_pts_info(st, 64, 1, sc->sample_rate);
664 sc->sample_size = 16;
665 sc->frame_rate_index = -2;
666 sc->lines_index = -2;
669 gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
671 } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
673 av_log(s, AV_LOG_ERROR, "video stream must be the first track\n");
676 /* FIXME check from time_base ? */
677 if (st->codec->height == 480 || st->codec->height == 512) { /* NTSC or NTSC+VBI */
678 sc->frame_rate_index = 5;
679 sc->sample_rate = 60;
680 gxf->flags |= 0x00000080;
681 gxf->time_base = (AVRational){ 1001, 60000 };
682 } else if (st->codec->height == 576 || st->codec->height == 608) { /* PAL or PAL+VBI */
683 sc->frame_rate_index = 6;
685 sc->sample_rate = 50;
686 gxf->flags |= 0x00000040;
687 gxf->time_base = (AVRational){ 1, 50 };
689 av_log(s, AV_LOG_ERROR, "unsupported video resolution, "
690 "gxf muxer only accepts PAL or NTSC resolutions currently\n");
693 avpriv_set_pts_info(st, 64, gxf->time_base.num, gxf->time_base.den);
694 if (gxf_find_lines_index(st) < 0)
695 sc->lines_index = -1;
696 sc->sample_size = st->codec->bit_rate;
697 sc->fields = 2; /* interlaced */
701 switch (st->codec->codec_id) {
702 case AV_CODEC_ID_MJPEG:
704 gxf->flags |= 0x00004000;
707 case AV_CODEC_ID_MPEG1VIDEO:
712 case AV_CODEC_ID_MPEG2VIDEO:
713 sc->first_gop_closed = -1;
716 gxf->flags |= 0x00008000;
719 case AV_CODEC_ID_DVVIDEO:
720 if (st->codec->pix_fmt == AV_PIX_FMT_YUV422P) {
723 gxf->flags |= 0x00002000;
727 gxf->flags |= 0x00001000;
732 av_log(s, AV_LOG_ERROR, "video codec not supported\n");
736 /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
737 sc->media_info = media_info<<8 | ('0'+tracks[media_info]++);
738 sc->order = s->nb_streams - st->index;
741 if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0)
744 gxf_init_timecode_track(&gxf->timecode_track, vsc);
745 gxf->flags |= 0x200000; // time code track is non-drop frame
747 gxf_write_map_packet(s, 0);
748 gxf_write_flt_packet(s);
749 gxf_write_umf_packet(s);
751 gxf->packet_count = 3;
757 static int gxf_write_eos_packet(AVIOContext *pb)
759 int64_t pos = avio_tell(pb);
761 gxf_write_packet_header(pb, PKT_EOS);
762 return updatePacketSize(pb, pos);
765 static int gxf_write_trailer(AVFormatContext *s)
767 GXFContext *gxf = s->priv_data;
768 AVIOContext *pb = s->pb;
772 ff_audio_interleave_close(s);
774 gxf_write_eos_packet(pb);
776 avio_seek(pb, 0, SEEK_SET);
777 /* overwrite map, flt and umf packets with new values */
778 gxf_write_map_packet(s, 1);
779 gxf_write_flt_packet(s);
780 gxf_write_umf_packet(s);
782 /* update duration in all map packets */
783 for (i = 1; i < gxf->map_offsets_nb; i++) {
784 avio_seek(pb, gxf->map_offsets[i], SEEK_SET);
785 gxf_write_map_packet(s, 1);
789 avio_seek(pb, end, SEEK_SET);
791 av_freep(&gxf->flt_entries);
792 av_freep(&gxf->map_offsets);
797 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
801 for(i=0; i<size-4 && c!=0x100; i++){
803 if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
804 sc->first_gop_closed= (buf[i+4]>>6)&1;
806 return (buf[i+1]>>3)&7;
809 static int gxf_write_media_preamble(AVFormatContext *s, AVPacket *pkt, int size)
811 GXFContext *gxf = s->priv_data;
812 AVIOContext *pb = s->pb;
813 AVStream *st = s->streams[pkt->stream_index];
814 GXFStreamContext *sc = st->priv_data;
816 /* If the video is frame-encoded, the frame numbers shall be represented by
817 * even field numbers.
818 * see SMPTE360M-2004 6.4.2.1.3 Media field number */
819 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
820 field_nb = gxf->nb_fields;
822 field_nb = av_rescale_rnd(pkt->dts, gxf->time_base.den,
823 (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
826 avio_w8(pb, sc->media_type);
827 avio_w8(pb, st->index);
828 avio_wb32(pb, field_nb);
829 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
831 avio_wb16(pb, size / 2);
832 } else if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
833 int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
834 if (frame_type == AV_PICTURE_TYPE_I) {
837 } else if (frame_type == AV_PICTURE_TYPE_B) {
845 } else if (st->codec->codec_id == AV_CODEC_ID_DVVIDEO) {
846 avio_w8(pb, size / 4096);
850 avio_wb32(pb, field_nb);
851 avio_w8(pb, 1); /* flags */
852 avio_w8(pb, 0); /* reserved */
856 static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
858 GXFContext *gxf = s->priv_data;
859 AVIOContext *pb = s->pb;
860 AVStream *st = s->streams[pkt->stream_index];
861 int64_t pos = avio_tell(pb);
863 int packet_start_offset = avio_tell(pb) / 1024;
865 gxf_write_packet_header(pb, PKT_MEDIA);
866 if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
867 padding = 4 - pkt->size % 4;
868 else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
869 padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
870 gxf_write_media_preamble(s, pkt, pkt->size + padding);
871 avio_write(pb, pkt->data, pkt->size);
872 gxf_write_padding(pb, padding);
874 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
875 if (!(gxf->flt_entries_nb % 500)) {
876 gxf->flt_entries = av_realloc(gxf->flt_entries,
877 (gxf->flt_entries_nb+500)*sizeof(*gxf->flt_entries));
878 if (!gxf->flt_entries) {
879 av_log(s, AV_LOG_ERROR, "could not reallocate flt entries\n");
883 gxf->flt_entries[gxf->flt_entries_nb++] = packet_start_offset;
884 gxf->nb_fields += 2; // count fields
887 updatePacketSize(pb, pos);
890 if (gxf->packet_count == 100) {
891 gxf_write_map_packet(s, 0);
892 gxf->packet_count = 0;
900 static int gxf_compare_field_nb(AVFormatContext *s, AVPacket *next, AVPacket *cur)
902 GXFContext *gxf = s->priv_data;
903 AVPacket *pkt[2] = { cur, next };
905 GXFStreamContext *sc[2];
907 for (i = 0; i < 2; i++) {
908 AVStream *st = s->streams[pkt[i]->stream_index];
909 sc[i] = st->priv_data;
910 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
911 field_nb[i] = av_rescale_rnd(pkt[i]->dts, gxf->time_base.den,
912 (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
913 field_nb[i] &= ~1; // compare against even field number because audio must be before video
915 field_nb[i] = pkt[i]->dts; // dts are field based
918 return field_nb[1] > field_nb[0] ||
919 (field_nb[1] == field_nb[0] && sc[1]->order > sc[0]->order);
922 static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
924 if (pkt && s->streams[pkt->stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
925 pkt->duration = 2; // enforce 2 fields
926 return ff_audio_rechunk_interleave(s, out, pkt, flush,
927 ff_interleave_packet_per_dts, gxf_compare_field_nb);
930 AVOutputFormat ff_gxf_muxer = {
932 .long_name = NULL_IF_CONFIG_SMALL("GXF (General eXchange Format)"),
934 .priv_data_size = sizeof(GXFContext),
935 .audio_codec = AV_CODEC_ID_PCM_S16LE,
936 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
937 .write_header = gxf_write_header,
938 .write_packet = gxf_write_packet,
939 .write_trailer = gxf_write_trailer,
940 .interleave_packet = gxf_interleave_packet,