3 * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/intfloat_readwrite.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 { 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 */
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_f(gxf->map_offsets,
347 sizeof(*gxf->map_offsets),
348 gxf->map_offsets_nb+30);
349 if (!gxf->map_offsets) {
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;
405 timestamp = s->timestamp;
408 if (t = av_dict_get(s->metadata, "creation_time", NULL, 0))
409 timestamp = ff_iso8601_to_unix_time(t->value);
413 gxf->nb_fields / (timecode_base * 3600) % 24 << 24 | // hours
414 gxf->nb_fields / (timecode_base * 60) % 60 << 16 | // minutes
415 gxf->nb_fields / timecode_base % 60 << 8 | // seconds
416 gxf->nb_fields % timecode_base; // fields
418 avio_wl32(pb, gxf->flags);
419 avio_wl32(pb, gxf->nb_fields); /* length of the longest track */
420 avio_wl32(pb, gxf->nb_fields); /* length of the shortest track */
421 avio_wl32(pb, 0); /* mark in */
422 avio_wl32(pb, gxf->nb_fields); /* mark out */
423 avio_wl32(pb, 0); /* timecode mark in */
424 avio_wl32(pb, timecode); /* timecode mark out */
425 avio_wl64(pb, timestamp); /* modification time */
426 avio_wl64(pb, timestamp); /* creation time */
427 avio_wl16(pb, 0); /* reserved */
428 avio_wl16(pb, 0); /* reserved */
429 avio_wl16(pb, gxf->audio_tracks);
430 avio_wl16(pb, 1); /* timecode track count */
431 avio_wl16(pb, 0); /* reserved */
432 avio_wl16(pb, gxf->mpeg_tracks);
436 static int gxf_write_umf_payload(AVFormatContext *s)
438 GXFContext *gxf = s->priv_data;
439 AVIOContext *pb = s->pb;
441 avio_wl32(pb, gxf->umf_length); /* total length of the umf data */
442 avio_wl32(pb, 3); /* version */
443 avio_wl32(pb, s->nb_streams+1);
444 avio_wl32(pb, gxf->umf_track_offset); /* umf track section offset */
445 avio_wl32(pb, gxf->umf_track_size);
446 avio_wl32(pb, s->nb_streams+1);
447 avio_wl32(pb, gxf->umf_media_offset);
448 avio_wl32(pb, gxf->umf_media_size);
449 avio_wl32(pb, gxf->umf_length); /* user data offset */
450 avio_wl32(pb, 0); /* user data size */
451 avio_wl32(pb, 0); /* reserved */
452 avio_wl32(pb, 0); /* reserved */
456 static int gxf_write_umf_track_description(AVFormatContext *s)
458 AVIOContext *pb = s->pb;
459 GXFContext *gxf = s->priv_data;
460 int64_t pos = avio_tell(pb);
463 gxf->umf_track_offset = pos - gxf->umf_start_offset;
464 for (i = 0; i < s->nb_streams; ++i) {
465 GXFStreamContext *sc = s->streams[i]->priv_data;
466 avio_wl16(pb, sc->media_info);
470 avio_wl16(pb, gxf->timecode_track.media_info);
473 return avio_tell(pb) - pos;
476 static int gxf_write_umf_media_mpeg(AVIOContext *pb, AVStream *st)
478 GXFStreamContext *sc = st->priv_data;
480 if (st->codec->pix_fmt == PIX_FMT_YUV422P)
483 avio_wl32(pb, 1); /* default to 420 */
484 avio_wl32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
485 avio_wl32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
486 avio_wl32(pb, 1); /* I picture per GOP */
487 avio_wl32(pb, sc->p_per_gop);
488 avio_wl32(pb, sc->b_per_i_or_p);
489 if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO)
491 else if (st->codec->codec_id == CODEC_ID_MPEG1VIDEO)
495 avio_wl32(pb, 0); /* reserved */
499 static int gxf_write_umf_media_timecode(AVIOContext *pb, GXFStreamContext *sc)
501 avio_wl32(pb, 1); /* non drop frame */
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 avio_wl32(pb, 0); /* reserved */
512 static int gxf_write_umf_media_dv(AVIOContext *pb, GXFStreamContext *sc)
516 for (i = 0; i < 8; i++) {
522 static int gxf_write_umf_media_audio(AVIOContext *pb, GXFStreamContext *sc)
524 avio_wl64(pb, av_dbl2int(1)); /* sound level to begin to */
525 avio_wl64(pb, av_dbl2int(1)); /* sound level to begin to */
526 avio_wl32(pb, 0); /* number of fields over which to ramp up sound level */
527 avio_wl32(pb, 0); /* number of fields over which to ramp down sound level */
528 avio_wl32(pb, 0); /* reserved */
529 avio_wl32(pb, 0); /* reserved */
534 static int gxf_write_umf_media_mjpeg(AVIOContext *pb, GXFStreamContext *sc)
536 avio_wb64(pb, 0); /* FIXME FLOAT max chroma quant level */
537 avio_wb64(pb, 0); /* FIXME FLOAT max luma quant level */
538 avio_wb64(pb, 0); /* FIXME FLOAT min chroma quant level */
539 avio_wb64(pb, 0); /* FIXME FLOAT min luma quant level */
544 static int gxf_write_umf_media_description(AVFormatContext *s)
546 GXFContext *gxf = s->priv_data;
547 AVIOContext *pb = s->pb;
552 gxf->umf_media_offset = pos - gxf->umf_start_offset;
553 for (i = 0; i <= s->nb_streams; ++i) {
554 GXFStreamContext *sc;
555 int64_t startpos, curpos;
557 if (i == s->nb_streams)
558 sc = &gxf->timecode_track;
560 sc = s->streams[i]->priv_data;
562 startpos = avio_tell(pb);
563 avio_wl16(pb, 0); /* length */
564 avio_wl16(pb, sc->media_info);
565 avio_wl16(pb, 0); /* reserved */
566 avio_wl16(pb, 0); /* reserved */
567 avio_wl32(pb, gxf->nb_fields);
568 avio_wl32(pb, 0); /* attributes rw, ro */
569 avio_wl32(pb, 0); /* mark in */
570 avio_wl32(pb, gxf->nb_fields); /* mark out */
571 avio_write(pb, ES_NAME_PATTERN, strlen(ES_NAME_PATTERN));
572 avio_wb16(pb, sc->media_info);
573 for (j = strlen(ES_NAME_PATTERN)+2; j < 88; j++)
575 avio_wl32(pb, sc->track_type);
576 avio_wl32(pb, sc->sample_rate);
577 avio_wl32(pb, sc->sample_size);
578 avio_wl32(pb, 0); /* reserved */
580 if (sc == &gxf->timecode_track)
581 gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
583 AVStream *st = s->streams[i];
584 switch (st->codec->codec_id) {
585 case CODEC_ID_MPEG1VIDEO:
586 case CODEC_ID_MPEG2VIDEO:
587 gxf_write_umf_media_mpeg(pb, st);
589 case CODEC_ID_PCM_S16LE:
590 gxf_write_umf_media_audio(pb, sc);
592 case CODEC_ID_DVVIDEO:
593 gxf_write_umf_media_dv(pb, sc);
598 curpos = avio_tell(pb);
599 avio_seek(pb, startpos, SEEK_SET);
600 avio_wl16(pb, curpos - startpos);
601 avio_seek(pb, curpos, SEEK_SET);
603 return avio_tell(pb) - pos;
606 static int gxf_write_umf_packet(AVFormatContext *s)
608 GXFContext *gxf = s->priv_data;
609 AVIOContext *pb = s->pb;
610 int64_t pos = avio_tell(pb);
612 gxf_write_packet_header(pb, PKT_UMF);
615 avio_w8(pb, 3); /* first and last (only) packet */
616 avio_wb32(pb, gxf->umf_length); /* data length */
618 gxf->umf_start_offset = avio_tell(pb);
619 gxf_write_umf_payload(s);
620 gxf_write_umf_material_description(s);
621 gxf->umf_track_size = gxf_write_umf_track_description(s);
622 gxf->umf_media_size = gxf_write_umf_media_description(s);
623 gxf->umf_length = avio_tell(pb) - gxf->umf_start_offset;
624 return updatePacketSize(pb, pos);
627 static const int GXF_samples_per_frame[] = { 32768, 0 };
629 static void gxf_init_timecode_track(GXFStreamContext *sc, GXFStreamContext *vsc)
634 sc->media_type = vsc->sample_rate == 60 ? 7 : 8;
635 sc->sample_rate = vsc->sample_rate;
636 sc->media_info = ('T'<<8) | '0';
638 sc->frame_rate_index = vsc->frame_rate_index;
639 sc->lines_index = vsc->lines_index;
640 sc->sample_size = 16;
641 sc->fields = vsc->fields;
644 static int gxf_write_header(AVFormatContext *s)
646 AVIOContext *pb = s->pb;
647 GXFContext *gxf = s->priv_data;
648 GXFStreamContext *vsc = NULL;
649 uint8_t tracks[255] = {0};
650 int i, media_info = 0;
653 av_log(s, AV_LOG_ERROR, "gxf muxer does not support streamed output, patch welcome");
657 gxf->flags |= 0x00080000; /* material is simple clip */
658 for (i = 0; i < s->nb_streams; ++i) {
659 AVStream *st = s->streams[i];
660 GXFStreamContext *sc = av_mallocz(sizeof(*sc));
662 return AVERROR(ENOMEM);
665 sc->media_type = ff_codec_get_tag(gxf_media_types, st->codec->codec_id);
666 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
667 if (st->codec->codec_id != CODEC_ID_PCM_S16LE) {
668 av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
671 if (st->codec->sample_rate != 48000) {
672 av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
675 if (st->codec->channels != 1) {
676 av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
680 sc->sample_rate = st->codec->sample_rate;
681 avpriv_set_pts_info(st, 64, 1, sc->sample_rate);
682 sc->sample_size = 16;
683 sc->frame_rate_index = -2;
684 sc->lines_index = -2;
687 gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
689 } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
691 av_log(s, AV_LOG_ERROR, "video stream must be the first track\n");
694 /* FIXME check from time_base ? */
695 if (st->codec->height == 480 || st->codec->height == 512) { /* NTSC or NTSC+VBI */
696 sc->frame_rate_index = 5;
697 sc->sample_rate = 60;
698 gxf->flags |= 0x00000080;
699 gxf->time_base = (AVRational){ 1001, 60000 };
700 } else if (st->codec->height == 576 || st->codec->height == 608) { /* PAL or PAL+VBI */
701 sc->frame_rate_index = 6;
703 sc->sample_rate = 50;
704 gxf->flags |= 0x00000040;
705 gxf->time_base = (AVRational){ 1, 50 };
707 av_log(s, AV_LOG_ERROR, "unsupported video resolution, "
708 "gxf muxer only accepts PAL or NTSC resolutions currently\n");
711 avpriv_set_pts_info(st, 64, gxf->time_base.num, gxf->time_base.den);
712 if (gxf_find_lines_index(st) < 0)
713 sc->lines_index = -1;
714 sc->sample_size = st->codec->bit_rate;
715 sc->fields = 2; /* interlaced */
719 switch (st->codec->codec_id) {
722 gxf->flags |= 0x00004000;
725 case CODEC_ID_MPEG1VIDEO:
730 case CODEC_ID_MPEG2VIDEO:
731 sc->first_gop_closed = -1;
734 gxf->flags |= 0x00008000;
737 case CODEC_ID_DVVIDEO:
738 if (st->codec->pix_fmt == PIX_FMT_YUV422P) {
741 gxf->flags |= 0x00002000;
745 gxf->flags |= 0x00001000;
750 av_log(s, AV_LOG_ERROR, "video codec not supported\n");
754 /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
755 sc->media_info = media_info<<8 | ('0'+tracks[media_info]++);
756 sc->order = s->nb_streams - st->index;
759 if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0)
762 gxf_init_timecode_track(&gxf->timecode_track, vsc);
763 gxf->flags |= 0x200000; // time code track is non-drop frame
765 gxf_write_map_packet(s, 0);
766 gxf_write_flt_packet(s);
767 gxf_write_umf_packet(s);
769 gxf->packet_count = 3;
775 static int gxf_write_eos_packet(AVIOContext *pb)
777 int64_t pos = avio_tell(pb);
779 gxf_write_packet_header(pb, PKT_EOS);
780 return updatePacketSize(pb, pos);
783 static int gxf_write_trailer(AVFormatContext *s)
785 GXFContext *gxf = s->priv_data;
786 AVIOContext *pb = s->pb;
790 ff_audio_interleave_close(s);
792 gxf_write_eos_packet(pb);
794 avio_seek(pb, 0, SEEK_SET);
795 /* overwrite map, flt and umf packets with new values */
796 gxf_write_map_packet(s, 1);
797 gxf_write_flt_packet(s);
798 gxf_write_umf_packet(s);
800 /* update duration in all map packets */
801 for (i = 1; i < gxf->map_offsets_nb; i++) {
802 avio_seek(pb, gxf->map_offsets[i], SEEK_SET);
803 gxf_write_map_packet(s, 1);
807 avio_seek(pb, end, SEEK_SET);
809 av_freep(&gxf->flt_entries);
810 av_freep(&gxf->map_offsets);
815 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
819 for(i=0; i<size-4 && c!=0x100; i++){
821 if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
822 sc->first_gop_closed= (buf[i+4]>>6)&1;
824 return (buf[i+1]>>3)&7;
827 static int gxf_write_media_preamble(AVFormatContext *s, AVPacket *pkt, int size)
829 GXFContext *gxf = s->priv_data;
830 AVIOContext *pb = s->pb;
831 AVStream *st = s->streams[pkt->stream_index];
832 GXFStreamContext *sc = st->priv_data;
834 /* If the video is frame-encoded, the frame numbers shall be represented by
835 * even field numbers.
836 * see SMPTE360M-2004 6.4.2.1.3 Media field number */
837 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
838 field_nb = gxf->nb_fields;
840 field_nb = av_rescale_rnd(pkt->dts, gxf->time_base.den,
841 (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
844 avio_w8(pb, sc->media_type);
845 avio_w8(pb, st->index);
846 avio_wb32(pb, field_nb);
847 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
849 avio_wb16(pb, size / 2);
850 } else if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
851 int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
852 if (frame_type == AV_PICTURE_TYPE_I) {
855 } else if (frame_type == AV_PICTURE_TYPE_B) {
863 } else if (st->codec->codec_id == CODEC_ID_DVVIDEO) {
864 avio_w8(pb, size / 4096);
868 avio_wb32(pb, field_nb);
869 avio_w8(pb, 1); /* flags */
870 avio_w8(pb, 0); /* reserved */
874 static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
876 GXFContext *gxf = s->priv_data;
877 AVIOContext *pb = s->pb;
878 AVStream *st = s->streams[pkt->stream_index];
879 int64_t pos = avio_tell(pb);
881 int packet_start_offset = avio_tell(pb) / 1024;
883 gxf_write_packet_header(pb, PKT_MEDIA);
884 if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
885 padding = 4 - pkt->size % 4;
886 else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
887 padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
888 gxf_write_media_preamble(s, pkt, pkt->size + padding);
889 avio_write(pb, pkt->data, pkt->size);
890 gxf_write_padding(pb, padding);
892 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
893 if (!(gxf->flt_entries_nb % 500)) {
894 gxf->flt_entries = av_realloc_f(gxf->flt_entries,
895 sizeof(*gxf->flt_entries),
896 gxf->flt_entries_nb+500);
897 if (!gxf->flt_entries) {
898 av_log(s, AV_LOG_ERROR, "could not reallocate flt entries\n");
902 gxf->flt_entries[gxf->flt_entries_nb++] = packet_start_offset;
903 gxf->nb_fields += 2; // count fields
906 updatePacketSize(pb, pos);
909 if (gxf->packet_count == 100) {
910 gxf_write_map_packet(s, 0);
911 gxf->packet_count = 0;
919 static int gxf_compare_field_nb(AVFormatContext *s, AVPacket *next, AVPacket *cur)
921 GXFContext *gxf = s->priv_data;
922 AVPacket *pkt[2] = { cur, next };
924 GXFStreamContext *sc[2];
926 for (i = 0; i < 2; i++) {
927 AVStream *st = s->streams[pkt[i]->stream_index];
928 sc[i] = st->priv_data;
929 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
930 field_nb[i] = av_rescale_rnd(pkt[i]->dts, gxf->time_base.den,
931 (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
932 field_nb[i] &= ~1; // compare against even field number because audio must be before video
934 field_nb[i] = pkt[i]->dts; // dts are field based
937 return field_nb[1] > field_nb[0] ||
938 (field_nb[1] == field_nb[0] && sc[1]->order > sc[0]->order);
941 static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
943 if (pkt && s->streams[pkt->stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
944 pkt->duration = 2; // enforce 2 fields
945 return ff_audio_rechunk_interleave(s, out, pkt, flush,
946 av_interleave_packet_per_dts, gxf_compare_field_nb);
949 AVOutputFormat ff_gxf_muxer = {
951 .long_name = NULL_IF_CONFIG_SMALL("GXF format"),
953 .priv_data_size = sizeof(GXFContext),
954 .audio_codec = CODEC_ID_PCM_S16LE,
955 .video_codec = CODEC_ID_MPEG2VIDEO,
956 .write_header = gxf_write_header,
957 .write_packet = gxf_write_packet,
958 .write_trailer = gxf_write_trailer,
959 .interleave_packet = gxf_interleave_packet,