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/fifo.h"
26 #include "audiointerleave.h"
28 #define GXF_AUDIO_PACKET_SIZE 65536
30 typedef struct GXFStreamContext {
31 AudioInterleaveContext aic;
44 int b_per_i_or_p; ///< number of B frames per I frame or P frame
48 typedef struct GXFContext {
50 uint16_t audio_tracks;
52 int64_t creation_time;
53 uint32_t umf_start_offset;
54 uint32_t umf_track_offset;
55 uint32_t umf_media_offset;
57 uint16_t umf_track_size;
58 uint16_t umf_media_size;
61 GXFStreamContext timecode_track;
64 typedef struct GXF_Lines {
70 /* FIXME check if it is relevant */
71 static const GXF_Lines gxf_lines_tab[] = {
72 { 480, 1 }, /* NTSC */
73 { 512, 1 }, /* NTSC + VBI */
75 { 608, 2 }, /* PAL + VBI */
80 static const AVCodecTag gxf_media_types[] = {
81 { CODEC_ID_MJPEG , 3 }, /* NTSC */
82 { CODEC_ID_MJPEG , 4 }, /* PAL */
83 { CODEC_ID_PCM_S24LE , 9 },
84 { CODEC_ID_PCM_S16LE , 10 },
85 { CODEC_ID_MPEG2VIDEO, 11 }, /* NTSC */
86 { CODEC_ID_MPEG2VIDEO, 12 }, /* PAL */
87 { CODEC_ID_DVVIDEO , 13 }, /* NTSC */
88 { CODEC_ID_DVVIDEO , 14 }, /* PAL */
89 { CODEC_ID_DVVIDEO , 15 }, /* 50M NTSC */
90 { CODEC_ID_DVVIDEO , 16 }, /* 50M PAL */
91 { CODEC_ID_AC3 , 17 },
92 //{ CODEC_ID_NONE, , 18 }, /* Non compressed 24 bit audio */
93 { CODEC_ID_MPEG2VIDEO, 20 }, /* MPEG HD */
94 { CODEC_ID_MPEG1VIDEO, 22 }, /* NTSC */
95 { CODEC_ID_MPEG1VIDEO, 23 }, /* PAL */
99 #define SERVER_PATH "/space/"
100 #define ES_NAME_PATTERN "ES."
102 static int gxf_find_lines_index(AVStream *st)
104 GXFStreamContext *sc = st->priv_data;
107 for (i = 0; i < 6; ++i) {
108 if (st->codec->height == gxf_lines_tab[i].height) {
109 sc->lines_index = gxf_lines_tab[i].index;
116 static void gxf_write_padding(ByteIOContext *pb, int64_t to_pad)
118 for (; to_pad > 0; to_pad--) {
123 static int64_t updatePacketSize(ByteIOContext *pb, int64_t pos)
128 size = url_ftell(pb) - pos;
130 gxf_write_padding(pb, 4 - size % 4);
131 size = url_ftell(pb) - pos;
133 curpos = url_ftell(pb);
134 url_fseek(pb, pos + 6, SEEK_SET);
136 url_fseek(pb, curpos, SEEK_SET);
140 static int64_t updateSize(ByteIOContext *pb, int64_t pos)
144 curpos = url_ftell(pb);
145 url_fseek(pb, pos, SEEK_SET);
146 put_be16(pb, curpos - pos - 2);
147 url_fseek(pb, curpos, SEEK_SET);
151 static void gxf_write_packet_header(ByteIOContext *pb, GXFPktType type)
153 put_be32(pb, 0); /* packet leader for synchro */
155 put_byte(pb, type); /* map packet */
156 put_be32(pb, 0); /* size */
157 put_be32(pb, 0); /* reserved */
158 put_byte(pb, 0xE1); /* trailer 1 */
159 put_byte(pb, 0xE2); /* trailer 2 */
162 static int gxf_write_mpeg_auxiliary(ByteIOContext *pb, AVStream *st)
164 GXFStreamContext *sc = st->priv_data;
166 int size, starting_line;
169 sc->p_per_gop = sc->pframes / sc->iframes;
170 if (sc->pframes % sc->iframes)
173 sc->b_per_i_or_p = sc->bframes / sc->pframes;
174 if (sc->bframes % sc->pframes)
177 if (sc->p_per_gop > 9)
178 sc->p_per_gop = 9; /* ensure value won't take more than one char */
179 if (sc->b_per_i_or_p > 9)
180 sc->b_per_i_or_p = 9; /* ensure value won't take more than one char */
182 if (st->codec->height == 512 || st->codec->height == 608)
183 starting_line = 7; // VBI
184 else if (st->codec->height == 480)
187 starting_line = 23; // default PAL
189 size = snprintf(buffer, 1024, "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n"
190 "Pix 0\nCf %d\nCg %d\nSl %d\nnl16 %d\nVi 1\nf1 1\n",
191 (float)st->codec->bit_rate, sc->p_per_gop, sc->b_per_i_or_p,
192 st->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1, sc->first_gop_closed == 1,
193 starting_line, st->codec->height / 16);
194 put_byte(pb, TRACK_MPG_AUX);
195 put_byte(pb, size + 1);
196 put_buffer(pb, (uint8_t *)buffer, size + 1);
200 static int gxf_write_timecode_auxiliary(ByteIOContext *pb, GXFStreamContext *sc)
202 put_byte(pb, 0); /* fields */
203 put_byte(pb, 0); /* seconds */
204 put_byte(pb, 0); /* minutes */
205 put_byte(pb, 0); /* flags + hours */
211 static int gxf_write_track_description(AVFormatContext *s, GXFStreamContext *sc, int index)
213 ByteIOContext *pb = s->pb;
215 int mpeg = sc->track_type == 4 || sc->track_type == 9;
217 /* track description section */
218 put_byte(pb, sc->media_type + 0x80);
219 put_byte(pb, index + 0xC0);
222 put_be16(pb, 0); /* size */
224 /* media file name */
225 put_byte(pb, TRACK_NAME);
226 put_byte(pb, strlen(ES_NAME_PATTERN) + 3);
227 put_tag(pb, ES_NAME_PATTERN);
228 put_be16(pb, sc->media_info);
232 /* auxiliary information */
233 put_byte(pb, TRACK_AUX);
235 if (sc->track_type == 3)
236 gxf_write_timecode_auxiliary(pb, sc);
241 /* file system version */
242 put_byte(pb, TRACK_VER);
247 gxf_write_mpeg_auxiliary(pb, s->streams[index]);
250 put_byte(pb, TRACK_FPS);
252 put_be32(pb, sc->frame_rate_index);
254 /* lines per frame */
255 put_byte(pb, TRACK_LINES);
257 put_be32(pb, sc->lines_index);
259 /* fields per frame */
260 put_byte(pb, TRACK_FPF);
262 put_be32(pb, sc->fields);
264 return updateSize(pb, pos);
267 static int gxf_write_material_data_section(AVFormatContext *s)
269 GXFContext *gxf = s->priv_data;
270 ByteIOContext *pb = s->pb;
272 const char *filename = strrchr(s->filename, '/');
275 put_be16(pb, 0); /* size */
281 filename = s->filename;
282 put_byte(pb, MAT_NAME);
283 put_byte(pb, strlen(SERVER_PATH) + strlen(filename) + 1);
284 put_tag(pb, SERVER_PATH);
285 put_tag(pb, filename);
289 put_byte(pb, MAT_FIRST_FIELD);
294 put_byte(pb, MAT_LAST_FIELD);
296 put_be32(pb, gxf->nb_fields);
299 put_byte(pb, MAT_MARK_IN);
303 put_byte(pb, MAT_MARK_OUT);
305 put_be32(pb, gxf->nb_fields);
308 put_byte(pb, MAT_SIZE);
310 put_be32(pb, url_fsize(pb) / 1024);
312 return updateSize(pb, pos);
315 static int gxf_write_track_description_section(AVFormatContext *s)
317 GXFContext *gxf = s->priv_data;
318 ByteIOContext *pb = s->pb;
323 put_be16(pb, 0); /* size */
324 for (i = 0; i < s->nb_streams; ++i)
325 gxf_write_track_description(s, s->streams[i]->priv_data, i);
327 gxf_write_track_description(s, &gxf->timecode_track, s->nb_streams);
329 return updateSize(pb, pos);
332 static int gxf_write_map_packet(AVFormatContext *s)
334 ByteIOContext *pb = s->pb;
335 int64_t pos = url_ftell(pb);
337 gxf_write_packet_header(pb, PKT_MAP);
340 put_byte(pb, 0xE0); /* version */
341 put_byte(pb, 0xFF); /* reserved */
343 gxf_write_material_data_section(s);
344 gxf_write_track_description_section(s);
346 return updatePacketSize(pb, pos);
350 static int gxf_write_flt_packet(AVFormatContext *s)
352 GXFContext *gxf = s->priv_data;
353 ByteIOContext *pb = s->pb;
354 int64_t pos = url_ftell(pb);
357 gxf_write_packet_header(pb, PKT_FLT);
359 put_le32(pb, 1000); /* number of fields */
360 put_le32(pb, 0); /* number of active flt entries */
362 for (i = 0; i < 1000; ++i) {
365 return updatePacketSize(pb, pos);
369 static int gxf_write_umf_material_description(AVFormatContext *s)
371 GXFContext *gxf = s->priv_data;
372 ByteIOContext *pb = s->pb;
376 gxf->nb_fields / (gxf->sample_rate * 3600) % 24 << 24 | // hours
377 gxf->nb_fields / (gxf->sample_rate * 60) % 60 << 16 | // minutes
378 gxf->nb_fields / gxf->sample_rate % 60 << 8 | // seconds
379 gxf->nb_fields % gxf->sample_rate; // fields
381 put_le32(pb, gxf->flags);
382 put_le32(pb, gxf->nb_fields); /* length of the longest track */
383 put_le32(pb, gxf->nb_fields); /* length of the shortest track */
384 put_le32(pb, 0); /* mark in */
385 put_le32(pb, gxf->nb_fields); /* mark out */
386 put_le32(pb, 0); /* timecode mark in */
387 put_le32(pb, timecode); /* timecode mark out */
388 put_le64(pb, s->timestamp); /* modification time */
389 put_le64(pb, s->timestamp); /* creation time */
390 put_le16(pb, 0); /* reserved */
391 put_le16(pb, 0); /* reserved */
392 put_le16(pb, gxf->audio_tracks);
393 put_le16(pb, 1); /* timecode track count */
394 put_le16(pb, 0); /* reserved */
395 put_le16(pb, gxf->mpeg_tracks);
399 static int gxf_write_umf_payload(AVFormatContext *s)
401 GXFContext *gxf = s->priv_data;
402 ByteIOContext *pb = s->pb;
404 put_le32(pb, gxf->umf_length); /* total length of the umf data */
405 put_le32(pb, 3); /* version */
406 put_le32(pb, s->nb_streams+1);
407 put_le32(pb, gxf->umf_track_offset); /* umf track section offset */
408 put_le32(pb, gxf->umf_track_size);
409 put_le32(pb, s->nb_streams+1);
410 put_le32(pb, gxf->umf_media_offset);
411 put_le32(pb, gxf->umf_media_size);
412 put_le32(pb, gxf->umf_length); /* user data offset */
413 put_le32(pb, 0); /* user data size */
414 put_le32(pb, 0); /* reserved */
415 put_le32(pb, 0); /* reserved */
419 static int gxf_write_umf_track_description(AVFormatContext *s)
421 ByteIOContext *pb = s->pb;
422 GXFContext *gxf = s->priv_data;
423 int64_t pos = url_ftell(pb);
426 gxf->umf_track_offset = pos - gxf->umf_start_offset;
427 for (i = 0; i < s->nb_streams; ++i) {
428 GXFStreamContext *sc = s->streams[i]->priv_data;
429 put_le16(pb, sc->media_info);
433 put_le16(pb, gxf->timecode_track.media_info);
436 return url_ftell(pb) - pos;
439 static int gxf_write_umf_media_mpeg(ByteIOContext *pb, AVStream *st)
441 GXFStreamContext *sc = st->priv_data;
443 if (st->codec->pix_fmt == PIX_FMT_YUV422P)
446 put_le32(pb, 1); /* default to 420 */
447 put_le32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
448 put_le32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
449 put_le32(pb, 1); /* I picture per GOP */
450 put_le32(pb, sc->p_per_gop);
451 put_le32(pb, sc->b_per_i_or_p);
452 if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO)
454 else if (st->codec->codec_id == CODEC_ID_MPEG1VIDEO)
458 put_le32(pb, 0); /* reserved */
462 static int gxf_write_umf_media_timecode(ByteIOContext *pb, GXFStreamContext *sc)
464 put_le32(pb, 1); /* non drop frame */
465 put_le32(pb, 0); /* reserved */
466 put_le32(pb, 0); /* reserved */
467 put_le32(pb, 0); /* reserved */
468 put_le32(pb, 0); /* reserved */
469 put_le32(pb, 0); /* reserved */
470 put_le32(pb, 0); /* reserved */
471 put_le32(pb, 0); /* reserved */
475 static int gxf_write_umf_media_dv(ByteIOContext *pb, GXFStreamContext *sc)
479 for (i = 0; i < 8; i++) {
485 static int gxf_write_umf_media_audio(ByteIOContext *pb, GXFStreamContext *sc)
487 put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
488 put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
489 put_le32(pb, 0); /* number of fields over which to ramp up sound level */
490 put_le32(pb, 0); /* number of fields over which to ramp down sound level */
491 put_le32(pb, 0); /* reserved */
492 put_le32(pb, 0); /* reserved */
497 static int gxf_write_umf_media_mjpeg(ByteIOContext *pb, GXFStreamContext *sc)
499 put_be64(pb, 0); /* FIXME FLOAT max chroma quant level */
500 put_be64(pb, 0); /* FIXME FLOAT max luma quant level */
501 put_be64(pb, 0); /* FIXME FLOAT min chroma quant level */
502 put_be64(pb, 0); /* FIXME FLOAT min luma quant level */
507 static int gxf_write_umf_media_description(AVFormatContext *s)
509 GXFContext *gxf = s->priv_data;
510 ByteIOContext *pb = s->pb;
515 gxf->umf_media_offset = pos - gxf->umf_start_offset;
516 for (i = 0; i <= s->nb_streams; ++i) {
517 GXFStreamContext *sc;
519 int64_t startpos, curpos;
520 int path_size = strlen(ES_NAME_PATTERN);
522 if (i == s->nb_streams)
523 sc = &gxf->timecode_track;
525 sc = s->streams[i]->priv_data;
527 memset(buffer, 0, 88);
528 startpos = url_ftell(pb);
529 put_le16(pb, 0); /* length */
530 put_le16(pb, sc->media_info);
531 put_le16(pb, 0); /* reserved */
532 put_le16(pb, 0); /* reserved */
533 put_le32(pb, gxf->nb_fields);
534 put_le32(pb, 0); /* attributes rw, ro */
535 put_le32(pb, 0); /* mark in */
536 put_le32(pb, gxf->nb_fields); /* mark out */
537 strncpy(buffer, ES_NAME_PATTERN, path_size);
538 put_buffer(pb, (uint8_t *)buffer, path_size);
539 put_be16(pb, sc->media_info);
540 put_buffer(pb, (uint8_t *)buffer + path_size + 2, 88 - path_size - 2);
541 put_le32(pb, sc->track_type);
542 put_le32(pb, sc->sample_rate);
543 put_le32(pb, sc->sample_size);
544 put_le32(pb, 0); /* reserved */
546 if (sc == &gxf->timecode_track)
547 gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
549 AVStream *st = s->streams[i];
550 switch (st->codec->codec_id) {
551 case CODEC_ID_MPEG2VIDEO:
552 gxf_write_umf_media_mpeg(pb, st);
554 case CODEC_ID_PCM_S16LE:
555 gxf_write_umf_media_audio(pb, sc);
557 case CODEC_ID_DVVIDEO:
558 gxf_write_umf_media_dv(pb, sc);
563 curpos = url_ftell(pb);
564 url_fseek(pb, startpos, SEEK_SET);
565 put_le16(pb, curpos - startpos);
566 url_fseek(pb, curpos, SEEK_SET);
568 return url_ftell(pb) - pos;
571 static int gxf_write_umf_packet(AVFormatContext *s)
573 GXFContext *gxf = s->priv_data;
574 ByteIOContext *pb = s->pb;
575 int64_t pos = url_ftell(pb);
577 gxf_write_packet_header(pb, PKT_UMF);
580 put_byte(pb, 3); /* first and last (only) packet */
581 put_be32(pb, gxf->umf_length); /* data length */
583 gxf->umf_start_offset = url_ftell(pb);
584 gxf_write_umf_payload(s);
585 gxf_write_umf_material_description(s);
586 gxf->umf_track_size = gxf_write_umf_track_description(s);
587 gxf->umf_media_size = gxf_write_umf_media_description(s);
588 gxf->umf_length = url_ftell(pb) - gxf->umf_start_offset;
589 return updatePacketSize(pb, pos);
592 static const int GXF_samples_per_frame[] = { 32768, 0 };
594 static void gxf_init_timecode_track(GXFStreamContext *sc, GXFStreamContext *vsc)
599 sc->media_type = vsc->sample_rate == 60 ? 7 : 8;
600 sc->sample_rate = vsc->sample_rate;
601 sc->media_info = ('T'<<8) | '0';
603 sc->frame_rate_index = vsc->frame_rate_index;
604 sc->lines_index = vsc->lines_index;
605 sc->sample_size = 16;
606 sc->fields = vsc->fields;
609 static int gxf_write_header(AVFormatContext *s)
611 ByteIOContext *pb = s->pb;
612 GXFContext *gxf = s->priv_data;
613 GXFStreamContext *vsc = NULL;
614 uint8_t tracks[255] = {0};
615 int i, media_info = 0;
617 gxf->flags |= 0x00080000; /* material is simple clip */
618 for (i = 0; i < s->nb_streams; ++i) {
619 AVStream *st = s->streams[i];
620 GXFStreamContext *sc = av_mallocz(sizeof(*sc));
622 return AVERROR(ENOMEM);
625 sc->media_type = codec_get_tag(gxf_media_types, st->codec->codec_id);
626 if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
627 if (st->codec->codec_id != CODEC_ID_PCM_S16LE) {
628 av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
631 if (st->codec->sample_rate != 48000) {
632 av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
635 if (st->codec->channels != 1) {
636 av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
640 sc->sample_rate = st->codec->sample_rate;
641 av_set_pts_info(st, 64, 1, sc->sample_rate);
642 sc->sample_size = 16;
643 sc->frame_rate_index = -2;
644 sc->lines_index = -2;
647 gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
649 } else if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
650 /* FIXME check from time_base ? */
651 if (st->codec->height == 480 || st->codec->height == 512) { /* NTSC or NTSC+VBI */
652 sc->frame_rate_index = 5;
653 sc->sample_rate = 60;
654 gxf->flags |= 0x00000080;
655 } else { /* assume PAL */
656 sc->frame_rate_index = 6;
658 sc->sample_rate = 50;
659 gxf->flags |= 0x00000040;
661 gxf->sample_rate = sc->sample_rate;
662 av_set_pts_info(st, 64, 1, st->codec->time_base.den);
663 if (gxf_find_lines_index(st) < 0)
664 sc->lines_index = -1;
665 sc->sample_size = st->codec->bit_rate;
666 sc->fields = 2; /* interlaced */
670 switch (st->codec->codec_id) {
673 gxf->flags |= 0x00004000;
676 case CODEC_ID_MPEG1VIDEO:
681 case CODEC_ID_MPEG2VIDEO:
682 sc->first_gop_closed = -1;
685 gxf->flags |= 0x00008000;
688 case CODEC_ID_DVVIDEO:
689 if (st->codec->pix_fmt == PIX_FMT_YUV422P) {
692 gxf->flags |= 0x00002000;
696 gxf->flags |= 0x00001000;
701 av_log(s, AV_LOG_ERROR, "video codec not supported\n");
705 /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
706 sc->media_info = media_info<<8 | ('0'+tracks[media_info]++);
709 if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0)
712 gxf_init_timecode_track(&gxf->timecode_track, vsc);
713 gxf->flags |= 0x200000; // time code track is non-drop frame
715 gxf_write_map_packet(s);
716 //gxf_write_flt_packet(s);
717 gxf_write_umf_packet(s);
718 put_flush_packet(pb);
722 static int gxf_write_eos_packet(ByteIOContext *pb)
724 int64_t pos = url_ftell(pb);
726 gxf_write_packet_header(pb, PKT_EOS);
727 return updatePacketSize(pb, pos);
730 static int gxf_write_trailer(AVFormatContext *s)
732 ByteIOContext *pb = s->pb;
735 ff_audio_interleave_close(s);
737 gxf_write_eos_packet(pb);
739 url_fseek(pb, 0, SEEK_SET);
740 /* overwrite map and umf packets with new values */
741 gxf_write_map_packet(s);
742 //gxf_write_flt_packet(s);
743 gxf_write_umf_packet(s);
744 url_fseek(pb, end, SEEK_SET);
748 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
752 for(i=0; i<size-4 && c!=0x100; i++){
754 if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
755 sc->first_gop_closed= (buf[i+4]>>6)&1;
757 return (buf[i+1]>>3)&7;
760 static int gxf_write_media_preamble(AVFormatContext *s, AVPacket *pkt, int size)
762 GXFContext *gxf = s->priv_data;
763 ByteIOContext *pb = s->pb;
764 AVStream *st = s->streams[pkt->stream_index];
765 GXFStreamContext *sc = st->priv_data;
767 /* If the video is frame-encoded, the frame numbers shall be represented by
768 * even field numbers.
769 * see SMPTE360M-2004 6.4.2.1.3 Media field number */
770 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
771 field_nb = gxf->nb_fields;
773 field_nb = av_rescale_rnd(pkt->dts, gxf->sample_rate, st->codec->time_base.den, AV_ROUND_UP);
776 put_byte(pb, sc->media_type);
777 put_byte(pb, st->index);
778 put_be32(pb, field_nb);
779 if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
781 put_be16(pb, size / 2);
782 } else if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
783 int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
784 if (frame_type == FF_I_TYPE) {
787 } else if (frame_type == FF_B_TYPE) {
795 } else if (st->codec->codec_id == CODEC_ID_DVVIDEO) {
796 put_byte(pb, size / 4096);
800 put_be32(pb, field_nb);
801 put_byte(pb, 1); /* flags */
802 put_byte(pb, 0); /* reserved */
806 static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
808 GXFContext *gxf = s->priv_data;
809 ByteIOContext *pb = s->pb;
810 AVStream *st = s->streams[pkt->stream_index];
811 int64_t pos = url_ftell(pb);
814 gxf_write_packet_header(pb, PKT_MEDIA);
815 if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
816 padding = 4 - pkt->size % 4;
817 else if (st->codec->codec_type == CODEC_TYPE_AUDIO)
818 padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
819 gxf_write_media_preamble(s, pkt, pkt->size + padding);
820 put_buffer(pb, pkt->data, pkt->size);
821 gxf_write_padding(pb, padding);
823 if (st->codec->codec_type == CODEC_TYPE_VIDEO)
824 gxf->nb_fields += 2; // count fields
826 put_flush_packet(pb);
828 return updatePacketSize(pb, pos);
831 static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
833 return ff_audio_rechunk_interleave(s, out, pkt, flush,
834 av_interleave_packet_per_dts, ff_interleave_compare_dts);
837 AVOutputFormat gxf_muxer = {
839 NULL_IF_CONFIG_SMALL("GXF format"),
850 gxf_interleave_packet,