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;
63 typedef struct GXF_Lines {
69 /* FIXME check if it is relevant */
70 static const GXF_Lines gxf_lines_tab[] = {
71 { 480, 1 }, /* NTSC */
72 { 512, 1 }, /* NTSC + VBI */
74 { 608, 2 }, /* PAL + VBI */
79 static const AVCodecTag gxf_media_types[] = {
80 { CODEC_ID_MJPEG , 3 }, /* NTSC */
81 { CODEC_ID_MJPEG , 4 }, /* PAL */
82 { CODEC_ID_PCM_S24LE , 9 },
83 { CODEC_ID_PCM_S16LE , 10 },
84 { CODEC_ID_MPEG2VIDEO, 11 }, /* NTSC */
85 { CODEC_ID_MPEG2VIDEO, 12 }, /* PAL */
86 { CODEC_ID_DVVIDEO , 13 }, /* NTSC */
87 { CODEC_ID_DVVIDEO , 14 }, /* PAL */
88 { CODEC_ID_DVVIDEO , 15 }, /* 50M NTSC */
89 { CODEC_ID_DVVIDEO , 16 }, /* 50M PAL */
90 { CODEC_ID_AC3 , 17 },
91 //{ CODEC_ID_NONE, , 18 }, /* Non compressed 24 bit audio */
92 { CODEC_ID_MPEG2VIDEO, 20 }, /* MPEG HD */
93 { CODEC_ID_MPEG1VIDEO, 22 }, /* NTSC */
94 { CODEC_ID_MPEG1VIDEO, 23 }, /* PAL */
98 #define SERVER_PATH "/space/"
99 #define ES_NAME_PATTERN "ES."
101 static int gxf_find_lines_index(AVStream *st)
103 GXFStreamContext *sc = st->priv_data;
106 for (i = 0; i < 6; ++i) {
107 if (st->codec->height == gxf_lines_tab[i].height) {
108 sc->lines_index = gxf_lines_tab[i].index;
115 static void gxf_write_padding(ByteIOContext *pb, int64_t to_pad)
117 for (; to_pad > 0; to_pad--) {
122 static int64_t updatePacketSize(ByteIOContext *pb, int64_t pos)
127 size = url_ftell(pb) - pos;
129 gxf_write_padding(pb, 4 - size % 4);
130 size = url_ftell(pb) - pos;
132 curpos = url_ftell(pb);
133 url_fseek(pb, pos + 6, SEEK_SET);
135 url_fseek(pb, curpos, SEEK_SET);
139 static int64_t updateSize(ByteIOContext *pb, int64_t pos)
143 curpos = url_ftell(pb);
144 url_fseek(pb, pos, SEEK_SET);
145 put_be16(pb, curpos - pos - 2);
146 url_fseek(pb, curpos, SEEK_SET);
150 static void gxf_write_packet_header(ByteIOContext *pb, GXFPktType type)
152 put_be32(pb, 0); /* packet leader for synchro */
154 put_byte(pb, type); /* map packet */
155 put_be32(pb, 0); /* size */
156 put_be32(pb, 0); /* reserved */
157 put_byte(pb, 0xE1); /* trailer 1 */
158 put_byte(pb, 0xE2); /* trailer 2 */
161 static int gxf_write_mpeg_auxiliary(ByteIOContext *pb, AVStream *st)
163 GXFStreamContext *sc = st->priv_data;
165 int size, starting_line;
168 sc->p_per_gop = sc->pframes / sc->iframes;
169 if (sc->pframes % sc->iframes)
172 sc->b_per_i_or_p = sc->bframes / sc->pframes;
173 if (sc->bframes % sc->pframes)
176 if (sc->p_per_gop > 9)
177 sc->p_per_gop = 9; /* ensure value won't take more than one char */
178 if (sc->b_per_i_or_p > 9)
179 sc->b_per_i_or_p = 9; /* ensure value won't take more than one char */
181 if (st->codec->height == 512 || st->codec->height == 608)
182 starting_line = 7; // VBI
183 else if (st->codec->height == 480)
186 starting_line = 23; // default PAL
188 size = snprintf(buffer, 1024, "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n"
189 "Pix 0\nCf %d\nCg %d\nSl %d\nnl16 %d\nVi 1\nf1 1\n",
190 (float)st->codec->bit_rate, sc->p_per_gop, sc->b_per_i_or_p,
191 st->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1, sc->first_gop_closed == 1,
192 starting_line, st->codec->height / 16);
193 put_byte(pb, TRACK_MPG_AUX);
194 put_byte(pb, size + 1);
195 put_buffer(pb, (uint8_t *)buffer, size + 1);
199 static int gxf_write_timecode_auxiliary(ByteIOContext *pb, GXFStreamContext *sc)
201 /* FIXME implement that */
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(ByteIOContext *pb, AVStream *st)
213 GXFStreamContext *sc = st->priv_data;
216 /* track description section */
217 put_byte(pb, sc->media_type + 0x80);
218 put_byte(pb, st->index + 0xC0);
221 put_be16(pb, 0); /* size */
223 /* media file name */
224 put_byte(pb, TRACK_NAME);
225 put_byte(pb, strlen(ES_NAME_PATTERN) + 3);
226 put_tag(pb, ES_NAME_PATTERN);
227 put_be16(pb, sc->media_info);
230 if (st->codec->codec_id != CODEC_ID_MPEG2VIDEO) {
231 /* auxiliary information */
232 put_byte(pb, TRACK_AUX);
234 if (st->codec->codec_id == CODEC_ID_NONE)
235 gxf_write_timecode_auxiliary(pb, sc);
240 /* file system version */
241 put_byte(pb, TRACK_VER);
245 if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO)
246 gxf_write_mpeg_auxiliary(pb, st);
249 put_byte(pb, TRACK_FPS);
251 put_be32(pb, sc->frame_rate_index);
253 /* lines per frame */
254 put_byte(pb, TRACK_LINES);
256 put_be32(pb, sc->lines_index);
258 /* fields per frame */
259 put_byte(pb, TRACK_FPF);
261 put_be32(pb, sc->fields);
263 return updateSize(pb, pos);
266 static int gxf_write_material_data_section(AVFormatContext *s)
268 GXFContext *gxf = s->priv_data;
269 ByteIOContext *pb = s->pb;
271 const char *filename = strrchr(s->filename, '/');
274 put_be16(pb, 0); /* size */
280 filename = s->filename;
281 put_byte(pb, MAT_NAME);
282 put_byte(pb, strlen(SERVER_PATH) + strlen(filename) + 1);
283 put_tag(pb, SERVER_PATH);
284 put_tag(pb, filename);
288 put_byte(pb, MAT_FIRST_FIELD);
293 put_byte(pb, MAT_LAST_FIELD);
295 put_be32(pb, gxf->nb_fields);
298 put_byte(pb, MAT_MARK_IN);
302 put_byte(pb, MAT_MARK_OUT);
304 put_be32(pb, gxf->nb_fields);
307 put_byte(pb, MAT_SIZE);
309 put_be32(pb, url_fsize(pb) / 1024);
311 return updateSize(pb, pos);
314 static int gxf_write_track_description_section(AVFormatContext *s)
316 ByteIOContext *pb = s->pb;
321 put_be16(pb, 0); /* size */
322 for (i = 0; i < s->nb_streams; ++i)
323 gxf_write_track_description(pb, s->streams[i]);
324 return updateSize(pb, pos);
327 static int gxf_write_map_packet(AVFormatContext *s)
329 ByteIOContext *pb = s->pb;
330 int64_t pos = url_ftell(pb);
332 gxf_write_packet_header(pb, PKT_MAP);
335 put_byte(pb, 0xE0); /* version */
336 put_byte(pb, 0xFF); /* reserved */
338 gxf_write_material_data_section(s);
339 gxf_write_track_description_section(s);
341 return updatePacketSize(pb, pos);
345 static int gxf_write_flt_packet(AVFormatContext *s)
347 GXFContext *gxf = s->priv_data;
348 ByteIOContext *pb = s->pb;
349 int64_t pos = url_ftell(pb);
352 gxf_write_packet_header(pb, PKT_FLT);
354 put_le32(pb, 1000); /* number of fields */
355 put_le32(pb, 0); /* number of active flt entries */
357 for (i = 0; i < 1000; ++i) {
360 return updatePacketSize(pb, pos);
364 static int gxf_write_umf_material_description(AVFormatContext *s)
366 GXFContext *gxf = s->priv_data;
367 ByteIOContext *pb = s->pb;
371 gxf->nb_fields / (gxf->sample_rate * 3600) % 24 << 24 | // hours
372 gxf->nb_fields / (gxf->sample_rate * 60) % 60 << 16 | // minutes
373 gxf->nb_fields / gxf->sample_rate % 60 << 8 | // seconds
374 gxf->nb_fields % gxf->sample_rate; // fields
376 put_le32(pb, gxf->flags);
377 put_le32(pb, gxf->nb_fields); /* length of the longest track */
378 put_le32(pb, gxf->nb_fields); /* length of the shortest track */
379 put_le32(pb, 0); /* mark in */
380 put_le32(pb, gxf->nb_fields); /* mark out */
381 put_le32(pb, 0); /* timecode mark in */
382 put_le32(pb, timecode); /* timecode mark out */
383 put_le64(pb, s->timestamp); /* modification time */
384 put_le64(pb, s->timestamp); /* creation time */
385 put_le16(pb, 0); /* reserved */
386 put_le16(pb, 0); /* reserved */
387 put_le16(pb, gxf->audio_tracks);
388 put_le16(pb, 0); /* timecode track count */
389 put_le16(pb, 0); /* reserved */
390 put_le16(pb, gxf->mpeg_tracks);
394 static int gxf_write_umf_payload(AVFormatContext *s)
396 GXFContext *gxf = s->priv_data;
397 ByteIOContext *pb = s->pb;
399 put_le32(pb, gxf->umf_length); /* total length of the umf data */
400 put_le32(pb, 3); /* version */
401 put_le32(pb, s->nb_streams);
402 put_le32(pb, gxf->umf_track_offset); /* umf track section offset */
403 put_le32(pb, gxf->umf_track_size);
404 put_le32(pb, s->nb_streams);
405 put_le32(pb, gxf->umf_media_offset);
406 put_le32(pb, gxf->umf_media_size);
407 put_le32(pb, gxf->umf_length); /* user data offset */
408 put_le32(pb, 0); /* user data size */
409 put_le32(pb, 0); /* reserved */
410 put_le32(pb, 0); /* reserved */
414 static int gxf_write_umf_track_description(AVFormatContext *s)
416 ByteIOContext *pb = s->pb;
417 GXFContext *gxf = s->priv_data;
418 int64_t pos = url_ftell(pb);
422 gxf->umf_track_offset = pos - gxf->umf_start_offset;
423 for (i = 0; i < s->nb_streams; ++i) {
424 AVStream *st = s->streams[i];
425 GXFStreamContext *sc = st->priv_data;
428 switch (st->codec->codec_id) {
429 case CODEC_ID_MPEG1VIDEO: id= 'L'; break;
430 case CODEC_ID_MPEG2VIDEO: id= 'M'; break;
431 case CODEC_ID_PCM_S16LE: id= 'A'; break;
432 case CODEC_ID_DVVIDEO: id= sc->track_type == 6 ? 'E' : 'D'; break;
433 case CODEC_ID_MJPEG: id= 'V'; break;
436 sc->media_info= id << 8;
437 /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
438 sc->media_info |= '0' + (tracks[id]++);
439 put_le16(pb, sc->media_info);
442 return url_ftell(pb) - pos;
445 static int gxf_write_umf_media_mpeg(ByteIOContext *pb, AVStream *st)
447 GXFStreamContext *sc = st->priv_data;
449 if (st->codec->pix_fmt == PIX_FMT_YUV422P)
452 put_le32(pb, 1); /* default to 420 */
453 put_le32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
454 put_le32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
455 put_le32(pb, 1); /* I picture per GOP */
456 put_le32(pb, sc->p_per_gop);
457 put_le32(pb, sc->b_per_i_or_p);
458 if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO)
460 else if (st->codec->codec_id == CODEC_ID_MPEG1VIDEO)
464 put_le32(pb, 0); /* reserved */
468 static int gxf_write_umf_media_timecode(ByteIOContext *pb, GXFStreamContext *sc)
470 /* FIXME implement */
471 put_be32(pb, 0); /* drop frame flag */
472 put_be32(pb, 0); /* reserved */
473 put_be32(pb, 0); /* reserved */
474 put_be32(pb, 0); /* reserved */
475 put_be32(pb, 0); /* reserved */
476 put_be32(pb, 0); /* reserved */
477 put_be32(pb, 0); /* reserved */
478 put_be32(pb, 0); /* reserved */
482 static int gxf_write_umf_media_dv(ByteIOContext *pb, GXFStreamContext *sc)
486 for (i = 0; i < 8; i++) {
492 static int gxf_write_umf_media_audio(ByteIOContext *pb, GXFStreamContext *sc)
494 put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
495 put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
496 put_le32(pb, 0); /* number of fields over which to ramp up sound level */
497 put_le32(pb, 0); /* number of fields over which to ramp down sound level */
498 put_le32(pb, 0); /* reserved */
499 put_le32(pb, 0); /* reserved */
504 static int gxf_write_umf_media_mjpeg(ByteIOContext *pb, GXFStreamContext *sc)
506 put_be64(pb, 0); /* FIXME FLOAT max chroma quant level */
507 put_be64(pb, 0); /* FIXME FLOAT max luma quant level */
508 put_be64(pb, 0); /* FIXME FLOAT min chroma quant level */
509 put_be64(pb, 0); /* FIXME FLOAT min luma quant level */
514 static int gxf_write_umf_media_description(AVFormatContext *s)
516 GXFContext *gxf = s->priv_data;
517 ByteIOContext *pb = s->pb;
522 gxf->umf_media_offset = pos - gxf->umf_start_offset;
523 for (i = 0; i < s->nb_streams; ++i) {
524 AVStream *st = s->streams[i];
525 GXFStreamContext *sc = st->priv_data;
527 int64_t startpos, curpos;
528 int path_size = strlen(ES_NAME_PATTERN);
530 memset(buffer, 0, 88);
531 startpos = url_ftell(pb);
532 put_le16(pb, 0); /* length */
533 put_le16(pb, sc->media_info);
534 put_le16(pb, 0); /* reserved */
535 put_le16(pb, 0); /* reserved */
536 put_le32(pb, gxf->nb_fields);
537 put_le32(pb, 0); /* attributes rw, ro */
538 put_le32(pb, 0); /* mark in */
539 put_le32(pb, gxf->nb_fields); /* mark out */
540 strncpy(buffer, ES_NAME_PATTERN, path_size);
541 put_buffer(pb, (uint8_t *)buffer, path_size);
542 put_be16(pb, sc->media_info);
543 put_buffer(pb, (uint8_t *)buffer + path_size + 2, 88 - path_size - 2);
544 put_le32(pb, sc->track_type);
545 put_le32(pb, sc->sample_rate);
546 put_le32(pb, sc->sample_size);
547 put_le32(pb, 0); /* reserved */
548 switch (st->codec->codec_id) {
549 case CODEC_ID_MPEG2VIDEO:
550 gxf_write_umf_media_mpeg(pb, st);
552 case CODEC_ID_PCM_S16LE:
553 gxf_write_umf_media_audio(pb, sc);
555 case CODEC_ID_DVVIDEO:
556 gxf_write_umf_media_dv(pb, sc);
559 gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
561 curpos = url_ftell(pb);
562 url_fseek(pb, startpos, SEEK_SET);
563 put_le16(pb, curpos - startpos);
564 url_fseek(pb, curpos, SEEK_SET);
566 return url_ftell(pb) - pos;
569 static int gxf_write_umf_packet(AVFormatContext *s)
571 GXFContext *gxf = s->priv_data;
572 ByteIOContext *pb = s->pb;
573 int64_t pos = url_ftell(pb);
575 gxf_write_packet_header(pb, PKT_UMF);
578 put_byte(pb, 3); /* first and last (only) packet */
579 put_be32(pb, gxf->umf_length); /* data length */
581 gxf->umf_start_offset = url_ftell(pb);
582 gxf_write_umf_payload(s);
583 gxf_write_umf_material_description(s);
584 gxf->umf_track_size = gxf_write_umf_track_description(s);
585 gxf->umf_media_size = gxf_write_umf_media_description(s);
586 gxf->umf_length = url_ftell(pb) - gxf->umf_start_offset;
587 return updatePacketSize(pb, pos);
590 static const int GXF_samples_per_frame[] = { 32768, 0 };
592 static int gxf_write_header(AVFormatContext *s)
594 ByteIOContext *pb = s->pb;
595 GXFContext *gxf = s->priv_data;
598 gxf->flags |= 0x00080000; /* material is simple clip */
599 for (i = 0; i < s->nb_streams; ++i) {
600 AVStream *st = s->streams[i];
601 GXFStreamContext *sc = av_mallocz(sizeof(*sc));
603 return AVERROR(ENOMEM);
606 sc->media_type = codec_get_tag(gxf_media_types, st->codec->codec_id);
607 if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
608 if (st->codec->codec_id != CODEC_ID_PCM_S16LE) {
609 av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
612 if (st->codec->sample_rate != 48000) {
613 av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
616 if (st->codec->channels != 1) {
617 av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
621 sc->sample_rate = st->codec->sample_rate;
622 av_set_pts_info(st, 64, 1, sc->sample_rate);
623 sc->sample_size = 16;
624 sc->frame_rate_index = -2;
625 sc->lines_index = -2;
628 gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
629 } else if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
630 /* FIXME check from time_base ? */
631 if (st->codec->height == 480 || st->codec->height == 512) { /* NTSC or NTSC+VBI */
632 sc->frame_rate_index = 5;
633 sc->sample_rate = 60;
634 gxf->flags |= 0x00000080;
635 } else { /* assume PAL */
636 sc->frame_rate_index = 6;
638 sc->sample_rate = 50;
639 gxf->flags |= 0x00000040;
641 gxf->sample_rate = sc->sample_rate;
642 av_set_pts_info(st, 64, 1, st->codec->time_base.den);
643 if (gxf_find_lines_index(st) < 0)
644 sc->lines_index = -1;
645 sc->sample_size = st->codec->bit_rate;
646 sc->fields = 2; /* interlaced */
647 switch (st->codec->codec_id) {
648 case CODEC_ID_MPEG2VIDEO:
649 sc->first_gop_closed = -1;
652 gxf->flags |= 0x00008000;
654 case CODEC_ID_DVVIDEO:
655 if (st->codec->pix_fmt == PIX_FMT_YUV422P) {
658 gxf->flags |= 0x00002000;
661 gxf->flags |= 0x00001000;
665 av_log(s, AV_LOG_ERROR, "video codec not supported\n");
671 if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0)
674 gxf_write_map_packet(s);
675 //gxf_write_flt_packet(s);
676 gxf_write_umf_packet(s);
677 put_flush_packet(pb);
681 static int gxf_write_eos_packet(ByteIOContext *pb)
683 int64_t pos = url_ftell(pb);
685 gxf_write_packet_header(pb, PKT_EOS);
686 return updatePacketSize(pb, pos);
689 static int gxf_write_trailer(AVFormatContext *s)
691 ByteIOContext *pb = s->pb;
694 ff_audio_interleave_close(s);
696 gxf_write_eos_packet(pb);
698 url_fseek(pb, 0, SEEK_SET);
699 /* overwrite map and umf packets with new values */
700 gxf_write_map_packet(s);
701 //gxf_write_flt_packet(s);
702 gxf_write_umf_packet(s);
703 url_fseek(pb, end, SEEK_SET);
707 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
711 for(i=0; i<size-4 && c!=0x100; i++){
713 if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
714 sc->first_gop_closed= (buf[i+4]>>6)&1;
716 return (buf[i+1]>>3)&7;
719 static int gxf_write_media_preamble(AVFormatContext *s, AVPacket *pkt, int size)
721 GXFContext *gxf = s->priv_data;
722 ByteIOContext *pb = s->pb;
723 AVStream *st = s->streams[pkt->stream_index];
724 GXFStreamContext *sc = st->priv_data;
726 /* If the video is frame-encoded, the frame numbers shall be represented by
727 * even field numbers.
728 * see SMPTE360M-2004 6.4.2.1.3 Media field number */
729 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
730 field_nb = gxf->nb_fields;
732 field_nb = av_rescale_rnd(pkt->dts, gxf->sample_rate, st->codec->time_base.den, AV_ROUND_UP);
735 put_byte(pb, sc->media_type);
736 put_byte(pb, st->index);
737 put_be32(pb, field_nb);
738 if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
740 put_be16(pb, size / 2);
741 } else if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
742 int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
743 if (frame_type == FF_I_TYPE) {
746 } else if (frame_type == FF_B_TYPE) {
754 } else if (st->codec->codec_id == CODEC_ID_DVVIDEO) {
755 put_byte(pb, size / 4096);
759 put_be32(pb, field_nb);
760 put_byte(pb, 1); /* flags */
761 put_byte(pb, 0); /* reserved */
765 static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
767 GXFContext *gxf = s->priv_data;
768 ByteIOContext *pb = s->pb;
769 AVStream *st = s->streams[pkt->stream_index];
770 int64_t pos = url_ftell(pb);
773 gxf_write_packet_header(pb, PKT_MEDIA);
774 if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
775 padding = 4 - pkt->size % 4;
776 else if (st->codec->codec_type == CODEC_TYPE_AUDIO)
777 padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
778 gxf_write_media_preamble(s, pkt, pkt->size + padding);
779 put_buffer(pb, pkt->data, pkt->size);
780 gxf_write_padding(pb, padding);
782 if (st->codec->codec_type == CODEC_TYPE_VIDEO)
783 gxf->nb_fields += 2; // count fields
785 put_flush_packet(pb);
787 return updatePacketSize(pb, pos);
790 static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
792 return ff_audio_rechunk_interleave(s, out, pkt, flush,
793 av_interleave_packet_per_dts, ff_interleave_compare_dts);
796 AVOutputFormat gxf_muxer = {
798 NULL_IF_CONFIG_SMALL("GXF format"),
809 gxf_interleave_packet,