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;
56 uint32_t umf_user_data_offset;
57 uint32_t umf_user_data_size;
59 uint16_t umf_track_size;
60 uint16_t umf_media_size;
65 typedef struct GXF_Lines {
71 /* FIXME check if it is relevant */
72 static const GXF_Lines gxf_lines_tab[] = {
73 { 480, 1 }, /* NTSC */
74 { 512, 1 }, /* NTSC + VBI */
76 { 608, 2 }, /* PAL + VBI */
81 static const AVCodecTag gxf_media_types[] = {
82 { CODEC_ID_MJPEG , 3 }, /* NTSC */
83 { CODEC_ID_MJPEG , 4 }, /* PAL */
84 { CODEC_ID_PCM_S24LE , 9 },
85 { CODEC_ID_PCM_S16LE , 10 },
86 { CODEC_ID_MPEG2VIDEO, 11 }, /* NTSC */
87 { CODEC_ID_MPEG2VIDEO, 12 }, /* PAL */
88 { CODEC_ID_DVVIDEO , 13 }, /* NTSC */
89 { CODEC_ID_DVVIDEO , 14 }, /* PAL */
90 { CODEC_ID_DVVIDEO , 15 }, /* 50M NTSC */
91 { CODEC_ID_DVVIDEO , 16 }, /* 50M PAL */
92 { CODEC_ID_AC3 , 17 },
93 //{ CODEC_ID_NONE, , 18 }, /* Non compressed 24 bit audio */
94 { CODEC_ID_MPEG2VIDEO, 20 }, /* MPEG HD */
95 { CODEC_ID_MPEG1VIDEO, 22 }, /* NTSC */
96 { CODEC_ID_MPEG1VIDEO, 23 }, /* PAL */
100 #define SERVER_PATH "/space/"
101 #define ES_NAME_PATTERN "ES."
103 static int gxf_find_lines_index(AVStream *st)
105 GXFStreamContext *sc = st->priv_data;
108 for (i = 0; i < 6; ++i) {
109 if (st->codec->height == gxf_lines_tab[i].height) {
110 sc->lines_index = gxf_lines_tab[i].index;
117 static void gxf_write_padding(ByteIOContext *pb, int64_t to_pad)
119 for (; to_pad > 0; to_pad--) {
124 static int64_t updatePacketSize(ByteIOContext *pb, int64_t pos)
129 size = url_ftell(pb) - pos;
131 gxf_write_padding(pb, 4 - size % 4);
132 size = url_ftell(pb) - pos;
134 curpos = url_ftell(pb);
135 url_fseek(pb, pos + 6, SEEK_SET);
137 url_fseek(pb, curpos, SEEK_SET);
141 static int64_t updateSize(ByteIOContext *pb, int64_t pos)
145 curpos = url_ftell(pb);
146 url_fseek(pb, pos, SEEK_SET);
147 put_be16(pb, curpos - pos - 2);
148 url_fseek(pb, curpos, SEEK_SET);
152 static void gxf_write_packet_header(ByteIOContext *pb, GXFPktType type)
154 put_be32(pb, 0); /* packet leader for synchro */
156 put_byte(pb, type); /* map packet */
157 put_be32(pb, 0); /* size */
158 put_be32(pb, 0); /* reserved */
159 put_byte(pb, 0xE1); /* trailer 1 */
160 put_byte(pb, 0xE2); /* trailer 2 */
163 static int gxf_write_mpeg_auxiliary(ByteIOContext *pb, AVStream *st)
165 GXFStreamContext *sc = st->priv_data;
167 int size, starting_line;
170 sc->p_per_gop = sc->pframes / sc->iframes;
171 if (sc->pframes % sc->iframes)
174 sc->b_per_i_or_p = sc->bframes / sc->pframes;
175 if (sc->bframes % sc->pframes)
178 if (sc->p_per_gop > 9)
179 sc->p_per_gop = 9; /* ensure value won't take more than one char */
180 if (sc->b_per_i_or_p > 9)
181 sc->b_per_i_or_p = 9; /* ensure value won't take more than one char */
183 if (st->codec->height == 512 || st->codec->height == 608)
184 starting_line = 7; // VBI
185 else if (st->codec->height == 480)
188 starting_line = 23; // default PAL
190 size = snprintf(buffer, 1024, "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n"
191 "Pix 0\nCf %d\nCg %d\nSl %d\nnl16 %d\nVi 1\nf1 1\n",
192 (float)st->codec->bit_rate, sc->p_per_gop, sc->b_per_i_or_p,
193 st->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1, sc->first_gop_closed == 1,
194 starting_line, st->codec->height / 16);
195 put_byte(pb, TRACK_MPG_AUX);
196 put_byte(pb, size + 1);
197 put_buffer(pb, (uint8_t *)buffer, size + 1);
201 static int gxf_write_timecode_auxiliary(ByteIOContext *pb, GXFStreamContext *sc)
203 /* FIXME implement that */
204 put_byte(pb, 0); /* fields */
205 put_byte(pb, 0); /* seconds */
206 put_byte(pb, 0); /* minutes */
207 put_byte(pb, 0); /* flags + hours */
213 static int gxf_write_track_description(ByteIOContext *pb, AVStream *st)
215 GXFStreamContext *sc = st->priv_data;
218 /* track description section */
219 put_byte(pb, sc->media_type + 0x80);
220 put_byte(pb, st->index + 0xC0);
223 put_be16(pb, 0); /* size */
225 /* media file name */
226 put_byte(pb, TRACK_NAME);
227 put_byte(pb, strlen(ES_NAME_PATTERN) + 3);
228 put_tag(pb, ES_NAME_PATTERN);
229 put_be16(pb, sc->media_info);
232 if (st->codec->codec_id != CODEC_ID_MPEG2VIDEO) {
233 /* auxiliary information */
234 put_byte(pb, TRACK_AUX);
236 if (st->codec->codec_id == CODEC_ID_NONE)
237 gxf_write_timecode_auxiliary(pb, sc);
242 /* file system version */
243 put_byte(pb, TRACK_VER);
247 if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO)
248 gxf_write_mpeg_auxiliary(pb, st);
251 put_byte(pb, TRACK_FPS);
253 put_be32(pb, sc->frame_rate_index);
255 /* lines per frame */
256 put_byte(pb, TRACK_LINES);
258 put_be32(pb, sc->lines_index);
260 /* fields per frame */
261 put_byte(pb, TRACK_FPF);
263 put_be32(pb, sc->fields);
265 return updateSize(pb, pos);
268 static int gxf_write_material_data_section(AVFormatContext *s)
270 GXFContext *gxf = s->priv_data;
271 ByteIOContext *pb = s->pb;
273 const char *filename = strrchr(s->filename, '/');
276 put_be16(pb, 0); /* size */
282 filename = s->filename;
283 put_byte(pb, MAT_NAME);
284 put_byte(pb, strlen(SERVER_PATH) + strlen(filename) + 1);
285 put_tag(pb, SERVER_PATH);
286 put_tag(pb, filename);
290 put_byte(pb, MAT_FIRST_FIELD);
295 put_byte(pb, MAT_LAST_FIELD);
297 put_be32(pb, gxf->nb_fields);
300 put_byte(pb, MAT_MARK_IN);
304 put_byte(pb, MAT_MARK_OUT);
306 put_be32(pb, gxf->nb_fields);
309 put_byte(pb, MAT_SIZE);
311 put_be32(pb, url_fsize(pb) / 1024);
313 return updateSize(pb, pos);
316 static int gxf_write_track_description_section(AVFormatContext *s)
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(pb, s->streams[i]);
326 return updateSize(pb, pos);
329 static int gxf_write_map_packet(AVFormatContext *s)
331 ByteIOContext *pb = s->pb;
332 int64_t pos = url_ftell(pb);
334 gxf_write_packet_header(pb, PKT_MAP);
337 put_byte(pb, 0xE0); /* version */
338 put_byte(pb, 0xFF); /* reserved */
340 gxf_write_material_data_section(s);
341 gxf_write_track_description_section(s);
343 return updatePacketSize(pb, pos);
347 static int gxf_write_flt_packet(AVFormatContext *s)
349 GXFContext *gxf = s->priv_data;
350 ByteIOContext *pb = s->pb;
351 int64_t pos = url_ftell(pb);
354 gxf_write_packet_header(pb, PKT_FLT);
356 put_le32(pb, 1000); /* number of fields */
357 put_le32(pb, 0); /* number of active flt entries */
359 for (i = 0; i < 1000; ++i) {
362 return updatePacketSize(pb, pos);
366 static int gxf_write_umf_material_description(AVFormatContext *s)
368 GXFContext *gxf = s->priv_data;
369 ByteIOContext *pb = s->pb;
373 gxf->nb_fields / (gxf->sample_rate * 3600) % 24 << 24 | // hours
374 gxf->nb_fields / (gxf->sample_rate * 60) % 60 << 16 | // minutes
375 gxf->nb_fields / gxf->sample_rate % 60 << 8 | // seconds
376 gxf->nb_fields % gxf->sample_rate; // fields
378 put_le32(pb, gxf->flags);
379 put_le32(pb, gxf->nb_fields); /* length of the longest track */
380 put_le32(pb, gxf->nb_fields); /* length of the shortest track */
381 put_le32(pb, 0); /* mark in */
382 put_le32(pb, gxf->nb_fields); /* mark out */
383 put_le32(pb, 0); /* timecode mark in */
384 put_le32(pb, timecode); /* timecode mark out */
385 put_le64(pb, s->timestamp); /* modification time */
386 put_le64(pb, s->timestamp); /* creation time */
387 put_le16(pb, 0); /* reserved */
388 put_le16(pb, 0); /* reserved */
389 put_le16(pb, gxf->audio_tracks);
390 put_le16(pb, 0); /* timecode track count */
391 put_le16(pb, 0); /* reserved */
392 put_le16(pb, gxf->mpeg_tracks);
396 static int gxf_write_umf_payload(AVFormatContext *s)
398 GXFContext *gxf = s->priv_data;
399 ByteIOContext *pb = s->pb;
401 put_le32(pb, gxf->umf_length); /* total length of the umf data */
402 put_le32(pb, 3); /* version */
403 put_le32(pb, s->nb_streams);
404 put_le32(pb, gxf->umf_track_offset); /* umf track section offset */
405 put_le32(pb, gxf->umf_track_size);
406 put_le32(pb, s->nb_streams);
407 put_le32(pb, gxf->umf_media_offset);
408 put_le32(pb, gxf->umf_media_size);
409 put_le32(pb, gxf->umf_user_data_offset); /* user data offset */
410 put_le32(pb, gxf->umf_user_data_size); /* user data size */
411 put_le32(pb, 0); /* reserved */
412 put_le32(pb, 0); /* reserved */
416 static int gxf_write_umf_track_description(AVFormatContext *s)
418 ByteIOContext *pb = s->pb;
419 GXFContext *gxf = s->priv_data;
420 int64_t pos = url_ftell(pb);
424 gxf->umf_track_offset = pos - gxf->umf_start_offset;
425 for (i = 0; i < s->nb_streams; ++i) {
426 AVStream *st = s->streams[i];
427 GXFStreamContext *sc = st->priv_data;
430 switch (st->codec->codec_id) {
431 case CODEC_ID_MPEG1VIDEO: id= 'L'; break;
432 case CODEC_ID_MPEG2VIDEO: id= 'M'; break;
433 case CODEC_ID_PCM_S16LE: id= 'A'; break;
434 case CODEC_ID_DVVIDEO: id= sc->track_type == 6 ? 'E' : 'D'; break;
435 case CODEC_ID_MJPEG: id= 'V'; break;
438 sc->media_info= id << 8;
439 /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
440 sc->media_info |= '0' + (tracks[id]++);
441 put_le16(pb, sc->media_info);
444 return url_ftell(pb) - pos;
447 static int gxf_write_umf_media_mpeg(ByteIOContext *pb, AVStream *st)
449 GXFStreamContext *sc = st->priv_data;
451 if (st->codec->pix_fmt == PIX_FMT_YUV422P)
454 put_le32(pb, 1); /* default to 420 */
455 put_le32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
456 put_le32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
457 put_le32(pb, 1); /* I picture per GOP */
458 put_le32(pb, sc->p_per_gop);
459 put_le32(pb, sc->b_per_i_or_p);
460 if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO)
462 else if (st->codec->codec_id == CODEC_ID_MPEG1VIDEO)
466 put_le32(pb, 0); /* reserved */
470 static int gxf_write_umf_media_timecode(ByteIOContext *pb, GXFStreamContext *sc)
472 /* FIXME implement */
473 put_be32(pb, 0); /* drop frame flag */
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 */
479 put_be32(pb, 0); /* reserved */
480 put_be32(pb, 0); /* reserved */
484 static int gxf_write_umf_media_dv(ByteIOContext *pb, GXFStreamContext *sc)
488 for (i = 0; i < 8; i++) {
494 static int gxf_write_umf_media_audio(ByteIOContext *pb, GXFStreamContext *sc)
496 put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
497 put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
498 put_le32(pb, 0); /* number of fields over which to ramp up sound level */
499 put_le32(pb, 0); /* number of fields over which to ramp down sound level */
500 put_le32(pb, 0); /* reserved */
501 put_le32(pb, 0); /* reserved */
506 static int gxf_write_umf_media_mjpeg(ByteIOContext *pb, GXFStreamContext *sc)
508 put_be64(pb, 0); /* FIXME FLOAT max chroma quant level */
509 put_be64(pb, 0); /* FIXME FLOAT max luma quant level */
510 put_be64(pb, 0); /* FIXME FLOAT min chroma quant level */
511 put_be64(pb, 0); /* FIXME FLOAT min luma quant level */
516 static int gxf_write_umf_media_description(AVFormatContext *s)
518 GXFContext *gxf = s->priv_data;
519 ByteIOContext *pb = s->pb;
524 gxf->umf_media_offset = pos - gxf->umf_start_offset;
525 for (i = 0; i < s->nb_streams; ++i) {
526 AVStream *st = s->streams[i];
527 GXFStreamContext *sc = st->priv_data;
529 int64_t startpos, curpos;
530 int path_size = strlen(ES_NAME_PATTERN);
532 memset(buffer, 0, 88);
533 startpos = url_ftell(pb);
534 put_le16(pb, 0); /* length */
535 put_le16(pb, sc->media_info);
536 put_le16(pb, 0); /* reserved */
537 put_le16(pb, 0); /* reserved */
538 put_le32(pb, gxf->nb_fields);
539 put_le32(pb, 0); /* attributes rw, ro */
540 put_le32(pb, 0); /* mark in */
541 put_le32(pb, gxf->nb_fields); /* mark out */
542 strncpy(buffer, ES_NAME_PATTERN, path_size);
543 put_buffer(pb, (uint8_t *)buffer, path_size);
544 put_be16(pb, sc->media_info);
545 put_buffer(pb, (uint8_t *)buffer + path_size + 2, 88 - path_size - 2);
546 put_le32(pb, sc->track_type);
547 put_le32(pb, sc->sample_rate);
548 put_le32(pb, sc->sample_size);
549 put_le32(pb, 0); /* reserved */
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);
561 gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
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_user_data(AVFormatContext *s)
573 GXFContext *gxf = s->priv_data;
574 ByteIOContext *pb = s->pb;
575 int64_t pos = url_ftell(pb);
576 gxf->umf_user_data_offset = pos - gxf->umf_start_offset;
589 static int gxf_write_umf_packet(AVFormatContext *s)
591 GXFContext *gxf = s->priv_data;
592 ByteIOContext *pb = s->pb;
593 int64_t pos = url_ftell(pb);
595 gxf_write_packet_header(pb, PKT_UMF);
598 put_byte(pb, 3); /* first and last (only) packet */
599 put_be32(pb, gxf->umf_length); /* data length */
601 gxf->umf_start_offset = url_ftell(pb);
602 gxf_write_umf_payload(s);
603 gxf_write_umf_material_description(s);
604 gxf->umf_track_size = gxf_write_umf_track_description(s);
605 gxf->umf_media_size = gxf_write_umf_media_description(s);
606 gxf->umf_user_data_size = gxf_write_umf_user_data(s);
607 gxf->umf_length = url_ftell(pb) - gxf->umf_start_offset;
608 return updatePacketSize(pb, pos);
611 static const int GXF_samples_per_frame[] = { 32768, 0 };
613 static int gxf_write_header(AVFormatContext *s)
615 ByteIOContext *pb = s->pb;
616 GXFContext *gxf = s->priv_data;
619 gxf->flags |= 0x00080000; /* material is simple clip */
620 for (i = 0; i < s->nb_streams; ++i) {
621 AVStream *st = s->streams[i];
622 GXFStreamContext *sc = av_mallocz(sizeof(*sc));
624 return AVERROR(ENOMEM);
627 sc->media_type = codec_get_tag(gxf_media_types, st->codec->codec_id);
628 if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
629 if (st->codec->codec_id != CODEC_ID_PCM_S16LE) {
630 av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
633 if (st->codec->sample_rate != 48000) {
634 av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
637 if (st->codec->channels != 1) {
638 av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
642 sc->sample_rate = st->codec->sample_rate;
643 av_set_pts_info(st, 64, 1, sc->sample_rate);
644 sc->sample_size = 16;
645 sc->frame_rate_index = -2;
646 sc->lines_index = -2;
649 gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
650 } else if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
651 /* FIXME check from time_base ? */
652 if (st->codec->height == 480 || st->codec->height == 512) { /* NTSC or NTSC+VBI */
653 sc->frame_rate_index = 5;
654 sc->sample_rate = 60;
655 gxf->flags |= 0x00000080;
656 } else { /* assume PAL */
657 sc->frame_rate_index = 6;
659 sc->sample_rate = 50;
660 gxf->flags |= 0x00000040;
662 gxf->sample_rate = sc->sample_rate;
663 av_set_pts_info(st, 64, 1, st->codec->time_base.den);
664 if (gxf_find_lines_index(st) < 0)
665 sc->lines_index = -1;
666 sc->sample_size = st->codec->bit_rate;
667 sc->fields = 2; /* interlaced */
668 switch (st->codec->codec_id) {
669 case CODEC_ID_MPEG2VIDEO:
670 sc->first_gop_closed = -1;
673 gxf->flags |= 0x00008000;
675 case CODEC_ID_DVVIDEO:
676 if (st->codec->pix_fmt == PIX_FMT_YUV422P) {
679 gxf->flags |= 0x00002000;
682 gxf->flags |= 0x00001000;
686 av_log(s, AV_LOG_ERROR, "video codec not supported\n");
692 if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0)
695 gxf_write_map_packet(s);
696 //gxf_write_flt_packet(s);
697 gxf_write_umf_packet(s);
698 put_flush_packet(pb);
702 static int gxf_write_eos_packet(ByteIOContext *pb)
704 int64_t pos = url_ftell(pb);
706 gxf_write_packet_header(pb, PKT_EOS);
707 return updatePacketSize(pb, pos);
710 static int gxf_write_trailer(AVFormatContext *s)
712 ByteIOContext *pb = s->pb;
715 ff_audio_interleave_close(s);
717 gxf_write_eos_packet(pb);
719 url_fseek(pb, 0, SEEK_SET);
720 /* overwrite map and umf packets with new values */
721 gxf_write_map_packet(s);
722 //gxf_write_flt_packet(s);
723 gxf_write_umf_packet(s);
724 url_fseek(pb, end, SEEK_SET);
728 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
732 for(i=0; i<size-4 && c!=0x100; i++){
734 if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
735 sc->first_gop_closed= (buf[i+4]>>6)&1;
737 return (buf[i+1]>>3)&7;
740 static int gxf_write_media_preamble(AVFormatContext *s, AVPacket *pkt, int size)
742 GXFContext *gxf = s->priv_data;
743 ByteIOContext *pb = s->pb;
744 AVStream *st = s->streams[pkt->stream_index];
745 GXFStreamContext *sc = st->priv_data;
747 /* If the video is frame-encoded, the frame numbers shall be represented by
748 * even field numbers.
749 * see SMPTE360M-2004 6.4.2.1.3 Media field number */
750 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
751 field_nb = gxf->nb_fields;
753 field_nb = av_rescale_rnd(pkt->dts, gxf->sample_rate, st->codec->time_base.den, AV_ROUND_UP);
756 put_byte(pb, sc->media_type);
757 put_byte(pb, st->index);
758 put_be32(pb, field_nb);
759 if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
761 put_be16(pb, size / 2);
762 } else if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
763 int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
764 if (frame_type == FF_I_TYPE) {
767 } else if (frame_type == FF_B_TYPE) {
775 } else if (st->codec->codec_id == CODEC_ID_DVVIDEO) {
776 put_byte(pb, size / 4096);
780 put_be32(pb, field_nb);
781 put_byte(pb, 1); /* flags */
782 put_byte(pb, 0); /* reserved */
786 static int gxf_write_media_packet(AVFormatContext *s, AVPacket *pkt)
788 GXFContext *gxf = s->priv_data;
789 ByteIOContext *pb = s->pb;
790 AVStream *st = s->streams[pkt->stream_index];
791 int64_t pos = url_ftell(pb);
794 gxf_write_packet_header(pb, PKT_MEDIA);
795 if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
796 padding = 4 - pkt->size % 4;
797 else if (st->codec->codec_type == CODEC_TYPE_AUDIO)
798 padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
799 gxf_write_media_preamble(s, pkt, pkt->size + padding);
800 put_buffer(pb, pkt->data, pkt->size);
801 gxf_write_padding(pb, padding);
803 if (st->codec->codec_type == CODEC_TYPE_VIDEO)
804 gxf->nb_fields += 2; // count fields
806 return updatePacketSize(pb, pos);
809 static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
811 gxf_write_media_packet(s, pkt);
812 put_flush_packet(s->pb);
816 static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
818 return ff_audio_rechunk_interleave(s, out, pkt, flush,
819 av_interleave_packet_per_dts, ff_interleave_compare_dts);
822 AVOutputFormat gxf_muxer = {
824 NULL_IF_CONFIG_SMALL("GXF format"),
835 gxf_interleave_packet,