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"
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 { CODEC_ID_MJPEG , 3 }, /* NTSC */
84 { CODEC_ID_MJPEG , 4 }, /* PAL */
85 { CODEC_ID_PCM_S24LE , 9 },
86 { CODEC_ID_PCM_S16LE , 10 },
87 { CODEC_ID_MPEG2VIDEO, 11 }, /* NTSC */
88 { CODEC_ID_MPEG2VIDEO, 12 }, /* PAL */
89 { CODEC_ID_DVVIDEO , 13 }, /* NTSC */
90 { CODEC_ID_DVVIDEO , 14 }, /* PAL */
91 { CODEC_ID_DVVIDEO , 15 }, /* 50M NTSC */
92 { CODEC_ID_DVVIDEO , 16 }, /* 50M PAL */
93 { CODEC_ID_AC3 , 17 },
94 //{ CODEC_ID_NONE, , 18 }, /* Non compressed 24 bit audio */
95 { CODEC_ID_MPEG2VIDEO, 20 }, /* MPEG HD */
96 { CODEC_ID_MPEG1VIDEO, 22 }, /* NTSC */
97 { CODEC_ID_MPEG1VIDEO, 23 }, /* PAL */
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 == 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_f(gxf->map_offsets,
346 sizeof(*gxf->map_offsets),
347 gxf->map_offsets_nb+30);
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;
404 timestamp = s->timestamp;
407 if (t = av_dict_get(s->metadata, "creation_time", NULL, 0))
408 timestamp = ff_iso8601_to_unix_time(t->value);
412 gxf->nb_fields / (timecode_base * 3600) % 24 << 24 | // hours
413 gxf->nb_fields / (timecode_base * 60) % 60 << 16 | // minutes
414 gxf->nb_fields / timecode_base % 60 << 8 | // seconds
415 gxf->nb_fields % timecode_base; // fields
417 avio_wl32(pb, gxf->flags);
418 avio_wl32(pb, gxf->nb_fields); /* length of the longest track */
419 avio_wl32(pb, gxf->nb_fields); /* length of the shortest track */
420 avio_wl32(pb, 0); /* mark in */
421 avio_wl32(pb, gxf->nb_fields); /* mark out */
422 avio_wl32(pb, 0); /* timecode mark in */
423 avio_wl32(pb, timecode); /* timecode mark out */
424 avio_wl64(pb, timestamp); /* modification time */
425 avio_wl64(pb, timestamp); /* creation time */
426 avio_wl16(pb, 0); /* reserved */
427 avio_wl16(pb, 0); /* reserved */
428 avio_wl16(pb, gxf->audio_tracks);
429 avio_wl16(pb, 1); /* timecode track count */
430 avio_wl16(pb, 0); /* reserved */
431 avio_wl16(pb, gxf->mpeg_tracks);
435 static int gxf_write_umf_payload(AVFormatContext *s)
437 GXFContext *gxf = s->priv_data;
438 AVIOContext *pb = s->pb;
440 avio_wl32(pb, gxf->umf_length); /* total length of the umf data */
441 avio_wl32(pb, 3); /* version */
442 avio_wl32(pb, s->nb_streams+1);
443 avio_wl32(pb, gxf->umf_track_offset); /* umf track section offset */
444 avio_wl32(pb, gxf->umf_track_size);
445 avio_wl32(pb, s->nb_streams+1);
446 avio_wl32(pb, gxf->umf_media_offset);
447 avio_wl32(pb, gxf->umf_media_size);
448 avio_wl32(pb, gxf->umf_length); /* user data offset */
449 avio_wl32(pb, 0); /* user data size */
450 avio_wl32(pb, 0); /* reserved */
451 avio_wl32(pb, 0); /* reserved */
455 static int gxf_write_umf_track_description(AVFormatContext *s)
457 AVIOContext *pb = s->pb;
458 GXFContext *gxf = s->priv_data;
459 int64_t pos = avio_tell(pb);
462 gxf->umf_track_offset = pos - gxf->umf_start_offset;
463 for (i = 0; i < s->nb_streams; ++i) {
464 GXFStreamContext *sc = s->streams[i]->priv_data;
465 avio_wl16(pb, sc->media_info);
469 avio_wl16(pb, gxf->timecode_track.media_info);
472 return avio_tell(pb) - pos;
475 static int gxf_write_umf_media_mpeg(AVIOContext *pb, AVStream *st)
477 GXFStreamContext *sc = st->priv_data;
479 if (st->codec->pix_fmt == PIX_FMT_YUV422P)
482 avio_wl32(pb, 1); /* default to 420 */
483 avio_wl32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
484 avio_wl32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
485 avio_wl32(pb, 1); /* I picture per GOP */
486 avio_wl32(pb, sc->p_per_gop);
487 avio_wl32(pb, sc->b_per_i_or_p);
488 if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO)
490 else if (st->codec->codec_id == CODEC_ID_MPEG1VIDEO)
494 avio_wl32(pb, 0); /* reserved */
498 static int gxf_write_umf_media_timecode(AVIOContext *pb, GXFStreamContext *sc)
500 avio_wl32(pb, 1); /* non drop frame */
501 avio_wl32(pb, 0); /* reserved */
502 avio_wl32(pb, 0); /* reserved */
503 avio_wl32(pb, 0); /* reserved */
504 avio_wl32(pb, 0); /* reserved */
505 avio_wl32(pb, 0); /* reserved */
506 avio_wl32(pb, 0); /* reserved */
507 avio_wl32(pb, 0); /* reserved */
511 static int gxf_write_umf_media_dv(AVIOContext *pb, GXFStreamContext *sc)
515 for (i = 0; i < 8; i++) {
521 static int gxf_write_umf_media_audio(AVIOContext *pb, GXFStreamContext *sc)
523 avio_wl64(pb, av_dbl2int(1)); /* sound level to begin to */
524 avio_wl64(pb, av_dbl2int(1)); /* sound level to begin to */
525 avio_wl32(pb, 0); /* number of fields over which to ramp up sound level */
526 avio_wl32(pb, 0); /* number of fields over which to ramp down sound level */
527 avio_wl32(pb, 0); /* reserved */
528 avio_wl32(pb, 0); /* reserved */
533 static int gxf_write_umf_media_mjpeg(AVIOContext *pb, GXFStreamContext *sc)
535 avio_wb64(pb, 0); /* FIXME FLOAT max chroma quant level */
536 avio_wb64(pb, 0); /* FIXME FLOAT max luma quant level */
537 avio_wb64(pb, 0); /* FIXME FLOAT min chroma quant level */
538 avio_wb64(pb, 0); /* FIXME FLOAT min luma quant level */
543 static int gxf_write_umf_media_description(AVFormatContext *s)
545 GXFContext *gxf = s->priv_data;
546 AVIOContext *pb = s->pb;
551 gxf->umf_media_offset = pos - gxf->umf_start_offset;
552 for (i = 0; i <= s->nb_streams; ++i) {
553 GXFStreamContext *sc;
554 int64_t startpos, curpos;
556 if (i == s->nb_streams)
557 sc = &gxf->timecode_track;
559 sc = s->streams[i]->priv_data;
561 startpos = avio_tell(pb);
562 avio_wl16(pb, 0); /* length */
563 avio_wl16(pb, sc->media_info);
564 avio_wl16(pb, 0); /* reserved */
565 avio_wl16(pb, 0); /* reserved */
566 avio_wl32(pb, gxf->nb_fields);
567 avio_wl32(pb, 0); /* attributes rw, ro */
568 avio_wl32(pb, 0); /* mark in */
569 avio_wl32(pb, gxf->nb_fields); /* mark out */
570 avio_write(pb, ES_NAME_PATTERN, strlen(ES_NAME_PATTERN));
571 avio_wb16(pb, sc->media_info);
572 for (j = strlen(ES_NAME_PATTERN)+2; j < 88; j++)
574 avio_wl32(pb, sc->track_type);
575 avio_wl32(pb, sc->sample_rate);
576 avio_wl32(pb, sc->sample_size);
577 avio_wl32(pb, 0); /* reserved */
579 if (sc == &gxf->timecode_track)
580 gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
582 AVStream *st = s->streams[i];
583 switch (st->codec->codec_id) {
584 case CODEC_ID_MPEG1VIDEO:
585 case CODEC_ID_MPEG2VIDEO:
586 gxf_write_umf_media_mpeg(pb, st);
588 case CODEC_ID_PCM_S16LE:
589 gxf_write_umf_media_audio(pb, sc);
591 case CODEC_ID_DVVIDEO:
592 gxf_write_umf_media_dv(pb, sc);
597 curpos = avio_tell(pb);
598 avio_seek(pb, startpos, SEEK_SET);
599 avio_wl16(pb, curpos - startpos);
600 avio_seek(pb, curpos, SEEK_SET);
602 return avio_tell(pb) - pos;
605 static int gxf_write_umf_packet(AVFormatContext *s)
607 GXFContext *gxf = s->priv_data;
608 AVIOContext *pb = s->pb;
609 int64_t pos = avio_tell(pb);
611 gxf_write_packet_header(pb, PKT_UMF);
614 avio_w8(pb, 3); /* first and last (only) packet */
615 avio_wb32(pb, gxf->umf_length); /* data length */
617 gxf->umf_start_offset = avio_tell(pb);
618 gxf_write_umf_payload(s);
619 gxf_write_umf_material_description(s);
620 gxf->umf_track_size = gxf_write_umf_track_description(s);
621 gxf->umf_media_size = gxf_write_umf_media_description(s);
622 gxf->umf_length = avio_tell(pb) - gxf->umf_start_offset;
623 return updatePacketSize(pb, pos);
626 static const int GXF_samples_per_frame[] = { 32768, 0 };
628 static void gxf_init_timecode_track(GXFStreamContext *sc, GXFStreamContext *vsc)
633 sc->media_type = vsc->sample_rate == 60 ? 7 : 8;
634 sc->sample_rate = vsc->sample_rate;
635 sc->media_info = ('T'<<8) | '0';
637 sc->frame_rate_index = vsc->frame_rate_index;
638 sc->lines_index = vsc->lines_index;
639 sc->sample_size = 16;
640 sc->fields = vsc->fields;
643 static int gxf_write_header(AVFormatContext *s)
645 AVIOContext *pb = s->pb;
646 GXFContext *gxf = s->priv_data;
647 GXFStreamContext *vsc = NULL;
648 uint8_t tracks[255] = {0};
649 int i, media_info = 0;
652 av_log(s, AV_LOG_ERROR, "gxf muxer does not support streamed output, patch welcome");
656 gxf->flags |= 0x00080000; /* material is simple clip */
657 for (i = 0; i < s->nb_streams; ++i) {
658 AVStream *st = s->streams[i];
659 GXFStreamContext *sc = av_mallocz(sizeof(*sc));
661 return AVERROR(ENOMEM);
664 sc->media_type = ff_codec_get_tag(gxf_media_types, st->codec->codec_id);
665 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
666 if (st->codec->codec_id != CODEC_ID_PCM_S16LE) {
667 av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
670 if (st->codec->sample_rate != 48000) {
671 av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
674 if (st->codec->channels != 1) {
675 av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
679 sc->sample_rate = st->codec->sample_rate;
680 av_set_pts_info(st, 64, 1, sc->sample_rate);
681 sc->sample_size = 16;
682 sc->frame_rate_index = -2;
683 sc->lines_index = -2;
686 gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
688 } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
690 av_log(s, AV_LOG_ERROR, "video stream must be the first track\n");
693 /* FIXME check from time_base ? */
694 if (st->codec->height == 480 || st->codec->height == 512) { /* NTSC or NTSC+VBI */
695 sc->frame_rate_index = 5;
696 sc->sample_rate = 60;
697 gxf->flags |= 0x00000080;
698 gxf->time_base = (AVRational){ 1001, 60000 };
699 } else if (st->codec->height == 576 || st->codec->height == 608) { /* PAL or PAL+VBI */
700 sc->frame_rate_index = 6;
702 sc->sample_rate = 50;
703 gxf->flags |= 0x00000040;
704 gxf->time_base = (AVRational){ 1, 50 };
706 av_log(s, AV_LOG_ERROR, "unsupported video resolution, "
707 "gxf muxer only accepts PAL or NTSC resolutions currently\n");
710 av_set_pts_info(st, 64, gxf->time_base.num, gxf->time_base.den);
711 if (gxf_find_lines_index(st) < 0)
712 sc->lines_index = -1;
713 sc->sample_size = st->codec->bit_rate;
714 sc->fields = 2; /* interlaced */
718 switch (st->codec->codec_id) {
721 gxf->flags |= 0x00004000;
724 case CODEC_ID_MPEG1VIDEO:
729 case CODEC_ID_MPEG2VIDEO:
730 sc->first_gop_closed = -1;
733 gxf->flags |= 0x00008000;
736 case CODEC_ID_DVVIDEO:
737 if (st->codec->pix_fmt == PIX_FMT_YUV422P) {
740 gxf->flags |= 0x00002000;
744 gxf->flags |= 0x00001000;
749 av_log(s, AV_LOG_ERROR, "video codec not supported\n");
753 /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
754 sc->media_info = media_info<<8 | ('0'+tracks[media_info]++);
755 sc->order = s->nb_streams - st->index;
758 if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0)
761 gxf_init_timecode_track(&gxf->timecode_track, vsc);
762 gxf->flags |= 0x200000; // time code track is non-drop frame
764 gxf_write_map_packet(s, 0);
765 gxf_write_flt_packet(s);
766 gxf_write_umf_packet(s);
768 gxf->packet_count = 3;
774 static int gxf_write_eos_packet(AVIOContext *pb)
776 int64_t pos = avio_tell(pb);
778 gxf_write_packet_header(pb, PKT_EOS);
779 return updatePacketSize(pb, pos);
782 static int gxf_write_trailer(AVFormatContext *s)
784 GXFContext *gxf = s->priv_data;
785 AVIOContext *pb = s->pb;
789 ff_audio_interleave_close(s);
791 gxf_write_eos_packet(pb);
793 avio_seek(pb, 0, SEEK_SET);
794 /* overwrite map, flt and umf packets with new values */
795 gxf_write_map_packet(s, 1);
796 gxf_write_flt_packet(s);
797 gxf_write_umf_packet(s);
799 /* update duration in all map packets */
800 for (i = 1; i < gxf->map_offsets_nb; i++) {
801 avio_seek(pb, gxf->map_offsets[i], SEEK_SET);
802 gxf_write_map_packet(s, 1);
806 avio_seek(pb, end, SEEK_SET);
808 av_freep(&gxf->flt_entries);
809 av_freep(&gxf->map_offsets);
814 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
818 for(i=0; i<size-4 && c!=0x100; i++){
820 if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
821 sc->first_gop_closed= (buf[i+4]>>6)&1;
823 return (buf[i+1]>>3)&7;
826 static int gxf_write_media_preamble(AVFormatContext *s, AVPacket *pkt, int size)
828 GXFContext *gxf = s->priv_data;
829 AVIOContext *pb = s->pb;
830 AVStream *st = s->streams[pkt->stream_index];
831 GXFStreamContext *sc = st->priv_data;
833 /* If the video is frame-encoded, the frame numbers shall be represented by
834 * even field numbers.
835 * see SMPTE360M-2004 6.4.2.1.3 Media field number */
836 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
837 field_nb = gxf->nb_fields;
839 field_nb = av_rescale_rnd(pkt->dts, gxf->time_base.den,
840 (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
843 avio_w8(pb, sc->media_type);
844 avio_w8(pb, st->index);
845 avio_wb32(pb, field_nb);
846 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
848 avio_wb16(pb, size / 2);
849 } else if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
850 int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
851 if (frame_type == AV_PICTURE_TYPE_I) {
854 } else if (frame_type == AV_PICTURE_TYPE_B) {
862 } else if (st->codec->codec_id == CODEC_ID_DVVIDEO) {
863 avio_w8(pb, size / 4096);
867 avio_wb32(pb, field_nb);
868 avio_w8(pb, 1); /* flags */
869 avio_w8(pb, 0); /* reserved */
873 static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
875 GXFContext *gxf = s->priv_data;
876 AVIOContext *pb = s->pb;
877 AVStream *st = s->streams[pkt->stream_index];
878 int64_t pos = avio_tell(pb);
880 int packet_start_offset = avio_tell(pb) / 1024;
882 gxf_write_packet_header(pb, PKT_MEDIA);
883 if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
884 padding = 4 - pkt->size % 4;
885 else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
886 padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
887 gxf_write_media_preamble(s, pkt, pkt->size + padding);
888 avio_write(pb, pkt->data, pkt->size);
889 gxf_write_padding(pb, padding);
891 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
892 if (!(gxf->flt_entries_nb % 500)) {
893 gxf->flt_entries = av_realloc_f(gxf->flt_entries,
894 sizeof(*gxf->flt_entries),
895 gxf->flt_entries_nb+500);
896 if (!gxf->flt_entries) {
897 av_log(s, AV_LOG_ERROR, "could not reallocate flt entries\n");
901 gxf->flt_entries[gxf->flt_entries_nb++] = packet_start_offset;
902 gxf->nb_fields += 2; // count fields
905 updatePacketSize(pb, pos);
908 if (gxf->packet_count == 100) {
909 gxf_write_map_packet(s, 0);
910 gxf->packet_count = 0;
918 static int gxf_compare_field_nb(AVFormatContext *s, AVPacket *next, AVPacket *cur)
920 GXFContext *gxf = s->priv_data;
921 AVPacket *pkt[2] = { cur, next };
923 GXFStreamContext *sc[2];
925 for (i = 0; i < 2; i++) {
926 AVStream *st = s->streams[pkt[i]->stream_index];
927 sc[i] = st->priv_data;
928 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
929 field_nb[i] = av_rescale_rnd(pkt[i]->dts, gxf->time_base.den,
930 (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
931 field_nb[i] &= ~1; // compare against even field number because audio must be before video
933 field_nb[i] = pkt[i]->dts; // dts are field based
936 return field_nb[1] > field_nb[0] ||
937 (field_nb[1] == field_nb[0] && sc[1]->order > sc[0]->order);
940 static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
942 if (pkt && s->streams[pkt->stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
943 pkt->duration = 2; // enforce 2 fields
944 return ff_audio_rechunk_interleave(s, out, pkt, flush,
945 av_interleave_packet_per_dts, gxf_compare_field_nb);
948 AVOutputFormat ff_gxf_muxer = {
950 .long_name = NULL_IF_CONFIG_SMALL("GXF format"),
952 .priv_data_size = sizeof(GXFContext),
953 .audio_codec = CODEC_ID_PCM_S16LE,
954 .video_codec = CODEC_ID_MPEG2VIDEO,
955 .write_header = gxf_write_header,
956 .write_packet = gxf_write_packet,
957 .write_trailer = gxf_write_trailer,
958 .interleave_packet = gxf_interleave_packet,