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
46 unsigned order; ///< interleaving order
49 typedef struct GXFContext {
51 uint16_t audio_tracks;
53 int64_t creation_time;
54 uint32_t umf_start_offset;
55 uint32_t umf_track_offset;
56 uint32_t umf_media_offset;
58 uint16_t umf_track_size;
59 uint16_t umf_media_size;
62 GXFStreamContext timecode_track;
63 unsigned *flt_entries; ///< offsets of packets /1024, starts after 2nd video field
64 unsigned flt_entries_nb;
65 uint64_t *map_offsets; ///< offset of map packets
66 unsigned map_offsets_nb;
67 unsigned packet_count;
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 "EXT:/PDR/default/"
101 #define ES_NAME_PATTERN "EXT:/PDR/default/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 put_byte(pb, 0); /* fields */
204 put_byte(pb, 0); /* seconds */
205 put_byte(pb, 0); /* minutes */
206 put_byte(pb, 0); /* flags + hours */
212 static int gxf_write_track_description(AVFormatContext *s, GXFStreamContext *sc, int index)
214 ByteIOContext *pb = s->pb;
216 int mpeg = sc->track_type == 4 || sc->track_type == 9;
218 /* track description section */
219 put_byte(pb, sc->media_type + 0x80);
220 put_byte(pb, 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);
233 /* auxiliary information */
234 put_byte(pb, TRACK_AUX);
236 if (sc->track_type == 3)
237 gxf_write_timecode_auxiliary(pb, sc);
242 /* file system version */
243 put_byte(pb, TRACK_VER);
248 gxf_write_mpeg_auxiliary(pb, s->streams[index]);
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 GXFContext *gxf = s->priv_data;
319 ByteIOContext *pb = s->pb;
324 put_be16(pb, 0); /* size */
325 for (i = 0; i < s->nb_streams; ++i)
326 gxf_write_track_description(s, s->streams[i]->priv_data, i);
328 gxf_write_track_description(s, &gxf->timecode_track, s->nb_streams);
330 return updateSize(pb, pos);
333 static int gxf_write_map_packet(AVFormatContext *s, int rewrite)
335 GXFContext *gxf = s->priv_data;
336 ByteIOContext *pb = s->pb;
337 int64_t pos = url_ftell(pb);
340 if (!(gxf->map_offsets_nb % 30)) {
341 gxf->map_offsets = av_realloc(gxf->map_offsets,
342 (gxf->map_offsets_nb+30)*sizeof(*gxf->map_offsets));
343 if (!gxf->map_offsets) {
344 av_log(s, AV_LOG_ERROR, "could not realloc map offsets\n");
348 gxf->map_offsets[gxf->map_offsets_nb++] = pos; // do not increment here
351 gxf_write_packet_header(pb, PKT_MAP);
354 put_byte(pb, 0xE0); /* version */
355 put_byte(pb, 0xFF); /* reserved */
357 gxf_write_material_data_section(s);
358 gxf_write_track_description_section(s);
360 return updatePacketSize(pb, pos);
363 static int gxf_write_flt_packet(AVFormatContext *s)
365 GXFContext *gxf = s->priv_data;
366 ByteIOContext *pb = s->pb;
367 int64_t pos = url_ftell(pb);
368 int fields_per_flt = (gxf->nb_fields+1) / 1000 + 1;
369 int flt_entries = gxf->nb_fields / fields_per_flt - 1;
372 gxf_write_packet_header(pb, PKT_FLT);
374 put_le32(pb, fields_per_flt); /* number of fields */
375 put_le32(pb, flt_entries); /* number of active flt entries */
377 if (gxf->flt_entries) {
378 for (i = 0; i < flt_entries; i++)
379 put_le32(pb, gxf->flt_entries[(i*fields_per_flt)>>1]);
382 for (; i < 1000; i++)
385 return updatePacketSize(pb, pos);
388 static int gxf_write_umf_material_description(AVFormatContext *s)
390 GXFContext *gxf = s->priv_data;
391 ByteIOContext *pb = s->pb;
392 int timecode_base = gxf->time_base.den == 60000 ? 60 : 50;
396 gxf->nb_fields / (timecode_base * 3600) % 24 << 24 | // hours
397 gxf->nb_fields / (timecode_base * 60) % 60 << 16 | // minutes
398 gxf->nb_fields / timecode_base % 60 << 8 | // seconds
399 gxf->nb_fields % timecode_base; // fields
401 put_le32(pb, gxf->flags);
402 put_le32(pb, gxf->nb_fields); /* length of the longest track */
403 put_le32(pb, gxf->nb_fields); /* length of the shortest track */
404 put_le32(pb, 0); /* mark in */
405 put_le32(pb, gxf->nb_fields); /* mark out */
406 put_le32(pb, 0); /* timecode mark in */
407 put_le32(pb, timecode); /* timecode mark out */
408 put_le64(pb, s->timestamp); /* modification time */
409 put_le64(pb, s->timestamp); /* creation time */
410 put_le16(pb, 0); /* reserved */
411 put_le16(pb, 0); /* reserved */
412 put_le16(pb, gxf->audio_tracks);
413 put_le16(pb, 1); /* timecode track count */
414 put_le16(pb, 0); /* reserved */
415 put_le16(pb, gxf->mpeg_tracks);
419 static int gxf_write_umf_payload(AVFormatContext *s)
421 GXFContext *gxf = s->priv_data;
422 ByteIOContext *pb = s->pb;
424 put_le32(pb, gxf->umf_length); /* total length of the umf data */
425 put_le32(pb, 3); /* version */
426 put_le32(pb, s->nb_streams+1);
427 put_le32(pb, gxf->umf_track_offset); /* umf track section offset */
428 put_le32(pb, gxf->umf_track_size);
429 put_le32(pb, s->nb_streams+1);
430 put_le32(pb, gxf->umf_media_offset);
431 put_le32(pb, gxf->umf_media_size);
432 put_le32(pb, gxf->umf_length); /* user data offset */
433 put_le32(pb, 0); /* user data size */
434 put_le32(pb, 0); /* reserved */
435 put_le32(pb, 0); /* reserved */
439 static int gxf_write_umf_track_description(AVFormatContext *s)
441 ByteIOContext *pb = s->pb;
442 GXFContext *gxf = s->priv_data;
443 int64_t pos = url_ftell(pb);
446 gxf->umf_track_offset = pos - gxf->umf_start_offset;
447 for (i = 0; i < s->nb_streams; ++i) {
448 GXFStreamContext *sc = s->streams[i]->priv_data;
449 put_le16(pb, sc->media_info);
453 put_le16(pb, gxf->timecode_track.media_info);
456 return url_ftell(pb) - pos;
459 static int gxf_write_umf_media_mpeg(ByteIOContext *pb, AVStream *st)
461 GXFStreamContext *sc = st->priv_data;
463 if (st->codec->pix_fmt == PIX_FMT_YUV422P)
466 put_le32(pb, 1); /* default to 420 */
467 put_le32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
468 put_le32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
469 put_le32(pb, 1); /* I picture per GOP */
470 put_le32(pb, sc->p_per_gop);
471 put_le32(pb, sc->b_per_i_or_p);
472 if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO)
474 else if (st->codec->codec_id == CODEC_ID_MPEG1VIDEO)
478 put_le32(pb, 0); /* reserved */
482 static int gxf_write_umf_media_timecode(ByteIOContext *pb, GXFStreamContext *sc)
484 put_le32(pb, 1); /* non drop frame */
485 put_le32(pb, 0); /* reserved */
486 put_le32(pb, 0); /* reserved */
487 put_le32(pb, 0); /* reserved */
488 put_le32(pb, 0); /* reserved */
489 put_le32(pb, 0); /* reserved */
490 put_le32(pb, 0); /* reserved */
491 put_le32(pb, 0); /* reserved */
495 static int gxf_write_umf_media_dv(ByteIOContext *pb, GXFStreamContext *sc)
499 for (i = 0; i < 8; i++) {
505 static int gxf_write_umf_media_audio(ByteIOContext *pb, GXFStreamContext *sc)
507 put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
508 put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
509 put_le32(pb, 0); /* number of fields over which to ramp up sound level */
510 put_le32(pb, 0); /* number of fields over which to ramp down sound level */
511 put_le32(pb, 0); /* reserved */
512 put_le32(pb, 0); /* reserved */
517 static int gxf_write_umf_media_mjpeg(ByteIOContext *pb, GXFStreamContext *sc)
519 put_be64(pb, 0); /* FIXME FLOAT max chroma quant level */
520 put_be64(pb, 0); /* FIXME FLOAT max luma quant level */
521 put_be64(pb, 0); /* FIXME FLOAT min chroma quant level */
522 put_be64(pb, 0); /* FIXME FLOAT min luma quant level */
527 static int gxf_write_umf_media_description(AVFormatContext *s)
529 GXFContext *gxf = s->priv_data;
530 ByteIOContext *pb = s->pb;
535 gxf->umf_media_offset = pos - gxf->umf_start_offset;
536 for (i = 0; i <= s->nb_streams; ++i) {
537 GXFStreamContext *sc;
538 int64_t startpos, curpos;
540 if (i == s->nb_streams)
541 sc = &gxf->timecode_track;
543 sc = s->streams[i]->priv_data;
545 startpos = url_ftell(pb);
546 put_le16(pb, 0); /* length */
547 put_le16(pb, sc->media_info);
548 put_le16(pb, 0); /* reserved */
549 put_le16(pb, 0); /* reserved */
550 put_le32(pb, gxf->nb_fields);
551 put_le32(pb, 0); /* attributes rw, ro */
552 put_le32(pb, 0); /* mark in */
553 put_le32(pb, gxf->nb_fields); /* mark out */
554 put_buffer(pb, ES_NAME_PATTERN, sizeof(ES_NAME_PATTERN));
555 put_be16(pb, sc->media_info);
556 for (j = sizeof(ES_NAME_PATTERN)+2; j < 88; j++)
558 put_le32(pb, sc->track_type);
559 put_le32(pb, sc->sample_rate);
560 put_le32(pb, sc->sample_size);
561 put_le32(pb, 0); /* reserved */
563 if (sc == &gxf->timecode_track)
564 gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
566 AVStream *st = s->streams[i];
567 switch (st->codec->codec_id) {
568 case CODEC_ID_MPEG2VIDEO:
569 gxf_write_umf_media_mpeg(pb, st);
571 case CODEC_ID_PCM_S16LE:
572 gxf_write_umf_media_audio(pb, sc);
574 case CODEC_ID_DVVIDEO:
575 gxf_write_umf_media_dv(pb, sc);
580 curpos = url_ftell(pb);
581 url_fseek(pb, startpos, SEEK_SET);
582 put_le16(pb, curpos - startpos);
583 url_fseek(pb, curpos, SEEK_SET);
585 return url_ftell(pb) - pos;
588 static int gxf_write_umf_packet(AVFormatContext *s)
590 GXFContext *gxf = s->priv_data;
591 ByteIOContext *pb = s->pb;
592 int64_t pos = url_ftell(pb);
594 gxf_write_packet_header(pb, PKT_UMF);
597 put_byte(pb, 3); /* first and last (only) packet */
598 put_be32(pb, gxf->umf_length); /* data length */
600 gxf->umf_start_offset = url_ftell(pb);
601 gxf_write_umf_payload(s);
602 gxf_write_umf_material_description(s);
603 gxf->umf_track_size = gxf_write_umf_track_description(s);
604 gxf->umf_media_size = gxf_write_umf_media_description(s);
605 gxf->umf_length = url_ftell(pb) - gxf->umf_start_offset;
606 return updatePacketSize(pb, pos);
609 static const int GXF_samples_per_frame[] = { 32768, 0 };
611 static void gxf_init_timecode_track(GXFStreamContext *sc, GXFStreamContext *vsc)
616 sc->media_type = vsc->sample_rate == 60 ? 7 : 8;
617 sc->sample_rate = vsc->sample_rate;
618 sc->media_info = ('T'<<8) | '0';
620 sc->frame_rate_index = vsc->frame_rate_index;
621 sc->lines_index = vsc->lines_index;
622 sc->sample_size = 16;
623 sc->fields = vsc->fields;
626 static int gxf_write_header(AVFormatContext *s)
628 ByteIOContext *pb = s->pb;
629 GXFContext *gxf = s->priv_data;
630 GXFStreamContext *vsc = NULL;
631 uint8_t tracks[255] = {0};
632 int i, media_info = 0;
634 if (url_is_streamed(pb)) {
635 av_log(s, AV_LOG_ERROR, "gxf muxer does not support streamed output, patch welcome");
639 gxf->flags |= 0x00080000; /* material is simple clip */
640 for (i = 0; i < s->nb_streams; ++i) {
641 AVStream *st = s->streams[i];
642 GXFStreamContext *sc = av_mallocz(sizeof(*sc));
644 return AVERROR(ENOMEM);
647 sc->media_type = codec_get_tag(gxf_media_types, st->codec->codec_id);
648 if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
649 if (st->codec->codec_id != CODEC_ID_PCM_S16LE) {
650 av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
653 if (st->codec->sample_rate != 48000) {
654 av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
657 if (st->codec->channels != 1) {
658 av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
662 sc->sample_rate = st->codec->sample_rate;
663 av_set_pts_info(st, 64, 1, sc->sample_rate);
664 sc->sample_size = 16;
665 sc->frame_rate_index = -2;
666 sc->lines_index = -2;
669 gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
671 } else if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
673 av_log(s, AV_LOG_ERROR, "video stream must be the first track\n");
676 /* FIXME check from time_base ? */
677 if (st->codec->height == 480 || st->codec->height == 512) { /* NTSC or NTSC+VBI */
678 sc->frame_rate_index = 5;
679 sc->sample_rate = 60;
680 gxf->flags |= 0x00000080;
681 gxf->time_base = (AVRational){ 1001, 60000 };
682 } else { /* assume PAL */
683 sc->frame_rate_index = 6;
685 sc->sample_rate = 50;
686 gxf->flags |= 0x00000040;
687 gxf->time_base = (AVRational){ 1, 50 };
689 av_set_pts_info(st, 64, gxf->time_base.num, gxf->time_base.den);
690 if (gxf_find_lines_index(st) < 0)
691 sc->lines_index = -1;
692 sc->sample_size = st->codec->bit_rate;
693 sc->fields = 2; /* interlaced */
697 switch (st->codec->codec_id) {
700 gxf->flags |= 0x00004000;
703 case CODEC_ID_MPEG1VIDEO:
708 case CODEC_ID_MPEG2VIDEO:
709 sc->first_gop_closed = -1;
712 gxf->flags |= 0x00008000;
715 case CODEC_ID_DVVIDEO:
716 if (st->codec->pix_fmt == PIX_FMT_YUV422P) {
719 gxf->flags |= 0x00002000;
723 gxf->flags |= 0x00001000;
728 av_log(s, AV_LOG_ERROR, "video codec not supported\n");
732 /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
733 sc->media_info = media_info<<8 | ('0'+tracks[media_info]++);
734 sc->order = s->nb_streams - st->index;
737 if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0)
740 gxf_init_timecode_track(&gxf->timecode_track, vsc);
741 gxf->flags |= 0x200000; // time code track is non-drop frame
743 gxf_write_map_packet(s, 0);
744 gxf_write_flt_packet(s);
745 gxf_write_umf_packet(s);
747 gxf->packet_count = 3;
749 put_flush_packet(pb);
753 static int gxf_write_eos_packet(ByteIOContext *pb)
755 int64_t pos = url_ftell(pb);
757 gxf_write_packet_header(pb, PKT_EOS);
758 return updatePacketSize(pb, pos);
761 static int gxf_write_trailer(AVFormatContext *s)
763 GXFContext *gxf = s->priv_data;
764 ByteIOContext *pb = s->pb;
768 ff_audio_interleave_close(s);
770 gxf_write_eos_packet(pb);
772 url_fseek(pb, 0, SEEK_SET);
773 /* overwrite map, flt and umf packets with new values */
774 gxf_write_map_packet(s, 1);
775 gxf_write_flt_packet(s);
776 gxf_write_umf_packet(s);
777 put_flush_packet(pb);
778 /* update duration in all map packets */
779 for (i = 1; i < gxf->map_offsets_nb; i++) {
780 url_fseek(pb, gxf->map_offsets[i], SEEK_SET);
781 gxf_write_map_packet(s, 1);
782 put_flush_packet(pb);
785 url_fseek(pb, end, SEEK_SET);
787 av_freep(&gxf->flt_entries);
788 av_freep(&gxf->map_offsets);
793 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
797 for(i=0; i<size-4 && c!=0x100; i++){
799 if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
800 sc->first_gop_closed= (buf[i+4]>>6)&1;
802 return (buf[i+1]>>3)&7;
805 static int gxf_write_media_preamble(AVFormatContext *s, AVPacket *pkt, int size)
807 GXFContext *gxf = s->priv_data;
808 ByteIOContext *pb = s->pb;
809 AVStream *st = s->streams[pkt->stream_index];
810 GXFStreamContext *sc = st->priv_data;
812 /* If the video is frame-encoded, the frame numbers shall be represented by
813 * even field numbers.
814 * see SMPTE360M-2004 6.4.2.1.3 Media field number */
815 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
816 field_nb = gxf->nb_fields;
818 field_nb = av_rescale_rnd(pkt->dts, gxf->time_base.den,
819 (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
822 put_byte(pb, sc->media_type);
823 put_byte(pb, st->index);
824 put_be32(pb, field_nb);
825 if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
827 put_be16(pb, size / 2);
828 } else if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
829 int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
830 if (frame_type == FF_I_TYPE) {
833 } else if (frame_type == FF_B_TYPE) {
841 } else if (st->codec->codec_id == CODEC_ID_DVVIDEO) {
842 put_byte(pb, size / 4096);
846 put_be32(pb, field_nb);
847 put_byte(pb, 1); /* flags */
848 put_byte(pb, 0); /* reserved */
852 static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
854 GXFContext *gxf = s->priv_data;
855 ByteIOContext *pb = s->pb;
856 AVStream *st = s->streams[pkt->stream_index];
857 int64_t pos = url_ftell(pb);
860 gxf_write_packet_header(pb, PKT_MEDIA);
861 if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
862 padding = 4 - pkt->size % 4;
863 else if (st->codec->codec_type == CODEC_TYPE_AUDIO)
864 padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
865 gxf_write_media_preamble(s, pkt, pkt->size + padding);
866 put_buffer(pb, pkt->data, pkt->size);
867 gxf_write_padding(pb, padding);
869 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
870 if (!(gxf->flt_entries_nb % 500)) {
871 gxf->flt_entries = av_realloc(gxf->flt_entries,
872 (gxf->flt_entries_nb+500)*sizeof(*gxf->flt_entries));
873 if (!gxf->flt_entries) {
874 av_log(s, AV_LOG_ERROR, "could not reallocate flt entries\n");
878 gxf->flt_entries[gxf->flt_entries_nb++] = url_ftell(pb) / 1024;
879 gxf->nb_fields += 2; // count fields
882 updatePacketSize(pb, pos);
885 if (gxf->packet_count == 100) {
886 gxf_write_map_packet(s, 0);
887 gxf->packet_count = 0;
890 put_flush_packet(pb);
895 static int gxf_compare_field_nb(AVFormatContext *s, AVPacket *next, AVPacket *cur)
897 GXFContext *gxf = s->priv_data;
898 AVPacket *pkt[2] = { cur, next };
900 GXFStreamContext *sc[2];
902 for (i = 0; i < 2; i++) {
903 AVStream *st = s->streams[pkt[i]->stream_index];
904 sc[i] = st->priv_data;
905 if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
906 field_nb[i] = av_rescale_rnd(pkt[i]->dts, gxf->time_base.den,
907 (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
908 field_nb[i] &= ~1; // compare against even field number because audio must be before video
910 field_nb[i] = pkt[i]->dts; // dts are field based
913 return field_nb[1] > field_nb[0] ||
914 (field_nb[1] == field_nb[0] && sc[1]->order > sc[0]->order);
917 static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
919 if (pkt && s->streams[pkt->stream_index]->codec->codec_type == CODEC_TYPE_VIDEO)
920 pkt->duration = 2; // enforce 2 fields
921 return ff_audio_rechunk_interleave(s, out, pkt, flush,
922 av_interleave_packet_per_dts, gxf_compare_field_nb);
925 AVOutputFormat gxf_muxer = {
927 NULL_IF_CONFIG_SMALL("GXF format"),
938 gxf_interleave_packet,