3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/attributes.h"
25 #include "libavutil/fifo.h"
26 #include "libavutil/log.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/opt.h"
29 #include "libavcodec/put_bits.h"
34 #define MAX_PAYLOAD_SIZE 4096
39 typedef struct PacketDesc {
45 struct PacketDesc *next;
51 int max_buffer_size; /* in bytes */
53 PacketDesc *predecode_packet;
54 PacketDesc *premux_packet;
55 PacketDesc **next_packet;
57 uint8_t lpcm_header[3];
61 int64_t vobu_start_pts;
66 int packet_size; /* required packet size */
68 int pack_header_freq; /* frequency (in packets^-1) at which we send pack headers */
69 int system_header_freq;
70 int system_header_size;
71 int mux_rate; /* bitrate in units of 50 bytes/s */
79 int64_t last_scr; /* current system clock */
81 double vcd_padding_bitrate; //FIXME floats
82 int64_t vcd_padding_bytes_written;
87 extern AVOutputFormat ff_mpeg1vcd_muxer;
88 extern AVOutputFormat ff_mpeg2dvd_muxer;
89 extern AVOutputFormat ff_mpeg2svcd_muxer;
90 extern AVOutputFormat ff_mpeg2vob_muxer;
92 static int put_pack_header(AVFormatContext *ctx,
93 uint8_t *buf, int64_t timestamp)
95 MpegMuxContext *s = ctx->priv_data;
98 init_put_bits(&pb, buf, 128);
100 put_bits32(&pb, PACK_START_CODE);
102 put_bits(&pb, 2, 0x1);
104 put_bits(&pb, 4, 0x2);
106 put_bits(&pb, 3, (uint32_t)((timestamp >> 30) & 0x07));
108 put_bits(&pb, 15, (uint32_t)((timestamp >> 15) & 0x7fff));
110 put_bits(&pb, 15, (uint32_t)((timestamp ) & 0x7fff));
113 /* clock extension */
117 put_bits(&pb, 22, s->mux_rate);
121 put_bits(&pb, 5, 0x1f); /* reserved */
122 put_bits(&pb, 3, 0); /* stuffing length */
125 return put_bits_ptr(&pb) - pb.buf;
128 static int put_system_header(AVFormatContext *ctx, uint8_t *buf,int only_for_stream_id)
130 MpegMuxContext *s = ctx->priv_data;
131 int size, i, private_stream_coded, id;
134 init_put_bits(&pb, buf, 128);
136 put_bits32(&pb, SYSTEM_HEADER_START_CODE);
137 put_bits(&pb, 16, 0);
140 put_bits(&pb, 22, s->mux_rate); /* maximum bit rate of the multiplexed stream */
141 put_bits(&pb, 1, 1); /* marker */
142 if (s->is_vcd && only_for_stream_id==VIDEO_ID) {
143 /* This header applies only to the video stream (see VCD standard p. IV-7)*/
146 put_bits(&pb, 6, s->audio_bound);
149 /* see VCD standard, p. IV-7*/
153 put_bits(&pb, 1, 0); /* variable bitrate*/
154 put_bits(&pb, 1, 0); /* non constrainted bit stream */
157 if (s->is_vcd || s->is_dvd) {
158 /* see VCD standard p IV-7 */
159 put_bits(&pb, 1, 1); /* audio locked */
160 put_bits(&pb, 1, 1); /* video locked */
162 put_bits(&pb, 1, 0); /* audio locked */
163 put_bits(&pb, 1, 0); /* video locked */
166 put_bits(&pb, 1, 1); /* marker */
168 if (s->is_vcd && (only_for_stream_id & 0xe0) == AUDIO_ID) {
169 /* This header applies only to the audio stream (see VCD standard p. IV-7)*/
172 put_bits(&pb, 5, s->video_bound);
175 put_bits(&pb, 1, 0); /* packet_rate_restriction_flag */
176 put_bits(&pb, 7, 0x7f); /* reserved byte */
178 put_bits(&pb, 8, 0xff); /* reserved byte */
180 /* DVD-Video Stream_bound entries
181 id (0xB9) video, maximum P-STD for stream 0xE0. (P-STD_buffer_bound_scale = 1)
182 id (0xB8) audio, maximum P-STD for any MPEG audio (0xC0 to 0xC7) streams. If there are none set to 4096 (32x128). (P-STD_buffer_bound_scale = 0)
183 id (0xBD) private stream 1 (audio other than MPEG and subpictures). (P-STD_buffer_bound_scale = 1)
184 id (0xBF) private stream 2, NAV packs, set to 2x1024. */
187 int P_STD_max_video = 0;
188 int P_STD_max_mpeg_audio = 0;
189 int P_STD_max_mpeg_PS1 = 0;
191 for(i=0;i<ctx->nb_streams;i++) {
192 StreamInfo *stream = ctx->streams[i]->priv_data;
195 if (id == 0xbd && stream->max_buffer_size > P_STD_max_mpeg_PS1) {
196 P_STD_max_mpeg_PS1 = stream->max_buffer_size;
197 } else if (id >= 0xc0 && id <= 0xc7 && stream->max_buffer_size > P_STD_max_mpeg_audio) {
198 P_STD_max_mpeg_audio = stream->max_buffer_size;
199 } else if (id == 0xe0 && stream->max_buffer_size > P_STD_max_video) {
200 P_STD_max_video = stream->max_buffer_size;
205 put_bits(&pb, 8, 0xb9); /* stream ID */
208 put_bits(&pb, 13, P_STD_max_video / 1024);
211 if (P_STD_max_mpeg_audio == 0)
212 P_STD_max_mpeg_audio = 4096;
213 put_bits(&pb, 8, 0xb8); /* stream ID */
216 put_bits(&pb, 13, P_STD_max_mpeg_audio / 128);
218 /* private stream 1 */
219 put_bits(&pb, 8, 0xbd); /* stream ID */
222 put_bits(&pb, 13, P_STD_max_mpeg_PS1 / 128);
224 /* private stream 2 */
225 put_bits(&pb, 8, 0xbf); /* stream ID */
228 put_bits(&pb, 13, 2);
231 /* audio stream info */
232 private_stream_coded = 0;
233 for(i=0;i<ctx->nb_streams;i++) {
234 StreamInfo *stream = ctx->streams[i]->priv_data;
237 /* For VCDs, only include the stream info for the stream
238 that the pack which contains this system belongs to.
239 (see VCD standard p. IV-7) */
240 if ( !s->is_vcd || stream->id==only_for_stream_id
241 || only_for_stream_id==0) {
245 /* special case for private streams (AC-3 uses that) */
246 if (private_stream_coded)
248 private_stream_coded = 1;
251 put_bits(&pb, 8, id); /* stream ID */
256 put_bits(&pb, 13, stream->max_buffer_size / 128);
260 put_bits(&pb, 13, stream->max_buffer_size / 1024);
267 size = put_bits_ptr(&pb) - pb.buf;
268 /* patch packet size */
269 buf[4] = (size - 6) >> 8;
270 buf[5] = (size - 6) & 0xff;
275 static int get_system_header_size(AVFormatContext *ctx)
277 int buf_index, i, private_stream_coded;
279 MpegMuxContext *s = ctx->priv_data;
282 return 18; // DVD-Video system headers are 18 bytes fixed length.
285 private_stream_coded = 0;
286 for(i=0;i<ctx->nb_streams;i++) {
287 stream = ctx->streams[i]->priv_data;
288 if (stream->id < 0xc0) {
289 if (private_stream_coded)
291 private_stream_coded = 1;
298 static av_cold int mpeg_mux_init(AVFormatContext *ctx)
300 MpegMuxContext *s = ctx->priv_data;
301 int bitrate, i, mpa_id, mpv_id, mps_id, ac3_id, dts_id, lpcm_id, j;
307 s->packet_number = 0;
308 s->is_vcd = (CONFIG_MPEG1VCD_MUXER && ctx->oformat == &ff_mpeg1vcd_muxer);
309 s->is_svcd = (CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &ff_mpeg2svcd_muxer);
310 s->is_mpeg2 = ((CONFIG_MPEG2VOB_MUXER && ctx->oformat == &ff_mpeg2vob_muxer) ||
311 (CONFIG_MPEG2DVD_MUXER && ctx->oformat == &ff_mpeg2dvd_muxer) ||
312 (CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &ff_mpeg2svcd_muxer));
313 s->is_dvd = (CONFIG_MPEG2DVD_MUXER && ctx->oformat == &ff_mpeg2dvd_muxer);
315 if(ctx->packet_size) {
316 if (ctx->packet_size < 20 || ctx->packet_size > (1 << 23) + 10) {
317 av_log(ctx, AV_LOG_ERROR, "Invalid packet size %d\n",
321 s->packet_size = ctx->packet_size;
323 s->packet_size = 2048;
324 if (ctx->max_delay < 0) /* Not set by the caller */
327 s->vcd_padding_bytes_written = 0;
328 s->vcd_padding_bitrate=0;
338 for(i=0;i<ctx->nb_streams;i++) {
339 st = ctx->streams[i];
340 stream = av_mallocz(sizeof(StreamInfo));
343 st->priv_data = stream;
345 avpriv_set_pts_info(st, 64, 1, 90000);
347 switch(st->codec->codec_type) {
348 case AVMEDIA_TYPE_AUDIO:
349 if (st->codec->codec_id == AV_CODEC_ID_AC3) {
350 stream->id = ac3_id++;
351 } else if (st->codec->codec_id == AV_CODEC_ID_DTS) {
352 stream->id = dts_id++;
353 } else if (st->codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
354 stream->id = lpcm_id++;
355 for(j = 0; j < 4; j++) {
356 if (lpcm_freq_tab[j] == st->codec->sample_rate)
361 if (st->codec->channels > 8)
363 stream->lpcm_header[0] = 0x0c;
364 stream->lpcm_header[1] = (st->codec->channels - 1) | (j << 4);
365 stream->lpcm_header[2] = 0x80;
366 stream->lpcm_align = st->codec->channels * 2;
368 stream->id = mpa_id++;
371 /* This value HAS to be used for VCD (see VCD standard, p. IV-7).
372 Right now it is also used for everything else.*/
373 stream->max_buffer_size = 4 * 1024;
376 case AVMEDIA_TYPE_VIDEO:
377 stream->id = mpv_id++;
378 if (st->codec->rc_buffer_size)
379 stream->max_buffer_size = 6*1024 + st->codec->rc_buffer_size/8;
381 av_log(ctx, AV_LOG_WARNING, "VBV buffer size not set, muxing may fail\n");
382 stream->max_buffer_size = 230*1024; //FIXME this is probably too small as default
386 case AVMEDIA_TYPE_SUBTITLE:
387 stream->id = mps_id++;
388 stream->max_buffer_size = 16 * 1024;
393 stream->fifo= av_fifo_alloc(16);
400 for(i=0;i<ctx->nb_streams;i++) {
402 st = ctx->streams[i];
403 stream = (StreamInfo*) st->priv_data;
405 if(st->codec->rc_max_rate || stream->id==VIDEO_ID)
406 codec_rate= st->codec->rc_max_rate;
408 codec_rate= st->codec->bit_rate;
411 codec_rate= (1<<21)*8*50/ctx->nb_streams;
413 bitrate += codec_rate;
415 if ((stream->id & 0xe0) == AUDIO_ID)
416 audio_bitrate += codec_rate;
417 else if (stream->id==VIDEO_ID)
418 video_bitrate += codec_rate;
422 /* we increase slightly the bitrate to take into account the
423 headers. XXX: compute it exactly */
424 bitrate += bitrate / 20;
426 s->mux_rate = (bitrate + (8 * 50) - 1) / (8 * 50);
430 double overhead_rate;
432 /* The VCD standard mandates that the mux_rate field is 3528
433 (see standard p. IV-6).
434 The value is actually "wrong", i.e. if you calculate
435 it using the normal formula and the 75 sectors per second transfer
436 rate you get a different value because the real pack size is 2324,
437 not 2352. But the standard explicitly specifies that the mux_rate
438 field in the header must have this value.*/
439 // s->mux_rate=2352 * 75 / 50; /* = 3528*/
441 /* The VCD standard states that the muxed stream must be
442 exactly 75 packs / second (the data rate of a single speed cdrom).
443 Since the video bitrate (probably 1150000 bits/sec) will be below
444 the theoretical maximum we have to add some padding packets
445 to make up for the lower data rate.
446 (cf. VCD standard p. IV-6 )*/
448 /* Add the header overhead to the data rate.
449 2279 data bytes per audio pack, 2294 data bytes per video pack*/
450 overhead_rate = ((audio_bitrate / 8.0) / 2279) * (2324 - 2279);
451 overhead_rate += ((video_bitrate / 8.0) / 2294) * (2324 - 2294);
454 /* Add padding so that the full bitrate is 2324*75 bytes/sec */
455 s->vcd_padding_bitrate = 2324 * 75 * 8 - (bitrate + overhead_rate);
458 if (s->is_vcd || s->is_mpeg2)
460 s->pack_header_freq = 1;
462 /* every 2 seconds */
463 s->pack_header_freq = 2 * bitrate / s->packet_size / 8;
465 /* the above seems to make pack_header_freq zero sometimes */
466 if (s->pack_header_freq == 0)
467 s->pack_header_freq = 1;
470 /* every 200 packets. Need to look at the spec. */
471 s->system_header_freq = s->pack_header_freq * 40;
473 /* the standard mandates that there are only two system headers
474 in the whole file: one in the first packet of each stream.
475 (see standard p. IV-7 and IV-8) */
476 s->system_header_freq = 0x7fffffff;
478 s->system_header_freq = s->pack_header_freq * 5;
480 for(i=0;i<ctx->nb_streams;i++) {
481 stream = ctx->streams[i]->priv_data;
482 stream->packet_number = 0;
484 s->system_header_size = get_system_header_size(ctx);
488 for(i=0;i<ctx->nb_streams;i++) {
489 av_free(ctx->streams[i]->priv_data);
491 return AVERROR(ENOMEM);
494 static inline void put_timestamp(AVIOContext *pb, int id, int64_t timestamp)
498 (((timestamp >> 30) & 0x07) << 1) |
500 avio_wb16(pb, (uint16_t)((((timestamp >> 15) & 0x7fff) << 1) | 1));
501 avio_wb16(pb, (uint16_t)((((timestamp ) & 0x7fff) << 1) | 1));
505 /* return the number of padding bytes that should be inserted into
506 the multiplexed stream.*/
507 static int get_vcd_padding_size(AVFormatContext *ctx, int64_t pts)
509 MpegMuxContext *s = ctx->priv_data;
512 if (s->vcd_padding_bitrate > 0 && pts!=AV_NOPTS_VALUE)
514 int64_t full_pad_bytes;
516 full_pad_bytes = (int64_t)((s->vcd_padding_bitrate * (pts / 90000.0)) / 8.0); //FIXME this is wrong
517 pad_bytes = (int) (full_pad_bytes - s->vcd_padding_bytes_written);
520 /* might happen if we have already padded to a later timestamp. This
521 can occur if another stream has already advanced further.*/
529 /* Write an MPEG padding packet header. */
530 static void put_padding_packet(AVFormatContext *ctx, AVIOContext *pb,int packet_bytes)
532 MpegMuxContext *s = ctx->priv_data;
535 avio_wb32(pb, PADDING_STREAM);
536 avio_wb16(pb, packet_bytes - 6);
543 for(i=0;i<packet_bytes;i++)
547 static int get_nb_frames(AVFormatContext *ctx, StreamInfo *stream, int len){
549 PacketDesc *pkt_desc= stream->premux_packet;
552 if(pkt_desc->size == pkt_desc->unwritten_size)
554 len -= pkt_desc->unwritten_size;
555 pkt_desc= pkt_desc->next;
561 /* flush the packet on stream stream_index */
562 static int flush_packet(AVFormatContext *ctx, int stream_index,
563 int64_t pts, int64_t dts, int64_t scr, int trailer_size)
565 MpegMuxContext *s = ctx->priv_data;
566 StreamInfo *stream = ctx->streams[stream_index]->priv_data;
568 int size, payload_size, startcode, id, stuffing_size, i, header_len;
571 int zero_trail_bytes = 0;
572 int pad_packet_bytes = 0;
574 int general_pack = 0; /*"general" pack without data specific to one stream?*/
579 av_dlog(ctx, "packet ID=%2x PTS=%0.3f\n", id, pts / 90000.0);
583 if ((s->packet_number % s->pack_header_freq) == 0 || s->last_scr != scr) {
584 /* output pack and systems header if needed */
585 size = put_pack_header(ctx, buf_ptr, scr);
590 /* there is exactly one system header for each stream in a VCD MPEG,
591 One in the very first video packet and one in the very first
592 audio packet (see VCD standard p. IV-7 and IV-8).*/
594 if (stream->packet_number==0) {
595 size = put_system_header(ctx, buf_ptr, id);
598 } else if (s->is_dvd) {
599 if (stream->align_iframe || s->packet_number == 0){
600 int PES_bytes_to_fill = s->packet_size - size - 10;
602 if (pts != AV_NOPTS_VALUE) {
604 PES_bytes_to_fill -= 5 + 5;
606 PES_bytes_to_fill -= 5;
609 if (stream->bytes_to_iframe == 0 || s->packet_number == 0) {
610 size = put_system_header(ctx, buf_ptr, 0);
612 size = buf_ptr - buffer;
613 avio_write(ctx->pb, buffer, size);
615 avio_wb32(ctx->pb, PRIVATE_STREAM_2);
616 avio_wb16(ctx->pb, 0x03d4); // length
617 avio_w8(ctx->pb, 0x00); // substream ID, 00=PCI
618 for (i = 0; i < 979; i++)
619 avio_w8(ctx->pb, 0x00);
621 avio_wb32(ctx->pb, PRIVATE_STREAM_2);
622 avio_wb16(ctx->pb, 0x03fa); // length
623 avio_w8(ctx->pb, 0x01); // substream ID, 01=DSI
624 for (i = 0; i < 1017; i++)
625 avio_w8(ctx->pb, 0x00);
627 memset(buffer, 0, 128);
630 stream->align_iframe = 0;
631 scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
632 size = put_pack_header(ctx, buf_ptr, scr);
636 } else if (stream->bytes_to_iframe < PES_bytes_to_fill) {
637 pad_packet_bytes = PES_bytes_to_fill - stream->bytes_to_iframe;
641 if ((s->packet_number % s->system_header_freq) == 0) {
642 size = put_system_header(ctx, buf_ptr, 0);
647 size = buf_ptr - buffer;
648 avio_write(ctx->pb, buffer, size);
650 packet_size = s->packet_size - size;
652 if (s->is_vcd && (id & 0xe0) == AUDIO_ID)
653 /* The VCD standard demands that 20 zero bytes follow
654 each audio pack (see standard p. IV-8).*/
655 zero_trail_bytes += 20;
657 if ((s->is_vcd && stream->packet_number==0)
658 || (s->is_svcd && s->packet_number==0)) {
659 /* for VCD the first pack of each stream contains only the pack header,
660 the system header and lots of padding (see VCD standard p. IV-6).
661 In the case of an audio pack, 20 zero bytes are also added at
663 /* For SVCD we fill the very first pack to increase compatibility with
664 some DVD players. Not mandated by the standard.*/
666 general_pack = 1; /* the system header refers to both streams and no stream data*/
667 pad_packet_bytes = packet_size - zero_trail_bytes;
670 packet_size -= pad_packet_bytes + zero_trail_bytes;
672 if (packet_size > 0) {
674 /* packet header size */
680 if (stream->packet_number==0)
681 header_len += 3; /* PES extension */
682 header_len += 1; /* obligatory stuffing byte */
686 if (pts != AV_NOPTS_VALUE) {
696 payload_size = packet_size - header_len;
698 startcode = PRIVATE_STREAM_1;
706 startcode = 0x100 + id;
709 stuffing_size = payload_size - av_fifo_size(stream->fifo);
711 // first byte does not fit -> reset pts/dts + stuffing
712 if(payload_size <= trailer_size && pts != AV_NOPTS_VALUE){
716 if(pts != AV_NOPTS_VALUE)
717 timestamp_len += s->is_mpeg2 ? 5 : 4;
718 pts=dts= AV_NOPTS_VALUE;
719 header_len -= timestamp_len;
720 if (s->is_dvd && stream->align_iframe) {
721 pad_packet_bytes += timestamp_len;
722 packet_size -= timestamp_len;
724 payload_size += timestamp_len;
726 stuffing_size += timestamp_len;
727 if(payload_size > trailer_size)
728 stuffing_size += payload_size - trailer_size;
731 if (pad_packet_bytes > 0 && pad_packet_bytes <= 7) { // can't use padding, so use stuffing
732 packet_size += pad_packet_bytes;
733 payload_size += pad_packet_bytes; // undo the previous adjustment
734 if (stuffing_size < 0) {
735 stuffing_size = pad_packet_bytes;
737 stuffing_size += pad_packet_bytes;
739 pad_packet_bytes = 0;
742 if (stuffing_size < 0)
745 if (startcode == PRIVATE_STREAM_1 && id >= 0xa0) {
746 if (payload_size < av_fifo_size(stream->fifo))
747 stuffing_size += payload_size % stream->lpcm_align;
750 if (stuffing_size > 16) { /*<=16 for MPEG-1, <=32 for MPEG-2*/
751 pad_packet_bytes += stuffing_size;
752 packet_size -= stuffing_size;
753 payload_size -= stuffing_size;
757 nb_frames= get_nb_frames(ctx, stream, payload_size - stuffing_size);
759 avio_wb32(ctx->pb, startcode);
761 avio_wb16(ctx->pb, packet_size);
764 for(i=0;i<stuffing_size;i++)
765 avio_w8(ctx->pb, 0xff);
768 avio_w8(ctx->pb, 0x80); /* mpeg2 id */
772 if (pts != AV_NOPTS_VALUE) {
778 /* Both the MPEG-2 and the SVCD standards demand that the
779 P-STD_buffer_size field be included in the first packet of
780 every stream. (see SVCD standard p. 26 V.2.3.1 and V.2.3.2
781 and MPEG-2 standard 2.7.7) */
782 if (stream->packet_number == 0)
785 avio_w8(ctx->pb, pes_flags); /* flags */
786 avio_w8(ctx->pb, header_len - 3 + stuffing_size);
788 if (pes_flags & 0x80) /*write pts*/
789 put_timestamp(ctx->pb, (pes_flags & 0x40) ? 0x03 : 0x02, pts);
790 if (pes_flags & 0x40) /*write dts*/
791 put_timestamp(ctx->pb, 0x01, dts);
793 if (pes_flags & 0x01) { /*write pes extension*/
794 avio_w8(ctx->pb, 0x10); /* flags */
796 /* P-STD buffer info */
797 if ((id & 0xe0) == AUDIO_ID)
798 avio_wb16(ctx->pb, 0x4000 | stream->max_buffer_size/ 128);
800 avio_wb16(ctx->pb, 0x6000 | stream->max_buffer_size/1024);
804 if (pts != AV_NOPTS_VALUE) {
806 put_timestamp(ctx->pb, 0x03, pts);
807 put_timestamp(ctx->pb, 0x01, dts);
809 put_timestamp(ctx->pb, 0x02, pts);
812 avio_w8(ctx->pb, 0x0f);
817 /* special stuffing byte that is always written
818 to prevent accidental generation of start codes. */
819 avio_w8(ctx->pb, 0xff);
821 for(i=0;i<stuffing_size;i++)
822 avio_w8(ctx->pb, 0xff);
825 if (startcode == PRIVATE_STREAM_1) {
826 avio_w8(ctx->pb, id);
828 /* LPCM (XXX: check nb_frames) */
830 avio_wb16(ctx->pb, 4); /* skip 3 header bytes */
831 avio_w8(ctx->pb, stream->lpcm_header[0]);
832 avio_w8(ctx->pb, stream->lpcm_header[1]);
833 avio_w8(ctx->pb, stream->lpcm_header[2]);
834 } else if (id >= 0x40) {
836 avio_w8(ctx->pb, nb_frames);
837 avio_wb16(ctx->pb, trailer_size+1);
842 assert(payload_size - stuffing_size <= av_fifo_size(stream->fifo));
843 av_fifo_generic_read(stream->fifo, ctx->pb, payload_size - stuffing_size, &avio_write);
844 stream->bytes_to_iframe -= payload_size - stuffing_size;
850 if (pad_packet_bytes > 0)
851 put_padding_packet(ctx,ctx->pb, pad_packet_bytes);
853 for(i=0;i<zero_trail_bytes;i++)
854 avio_w8(ctx->pb, 0x00);
860 /* only increase the stream packet number if this pack actually contains
861 something that is specific to this stream! I.e. a dedicated header
864 stream->packet_number++;
866 return payload_size - stuffing_size;
869 static void put_vcd_padding_sector(AVFormatContext *ctx)
871 /* There are two ways to do this padding: writing a sector/pack
872 of 0 values, or writing an MPEG padding pack. Both seem to
873 work with most decoders, BUT the VCD standard only allows a 0-sector
874 (see standard p. IV-4, IV-5).
875 So a 0-sector it is...*/
877 MpegMuxContext *s = ctx->priv_data;
880 for(i=0;i<s->packet_size;i++)
883 s->vcd_padding_bytes_written += s->packet_size;
887 /* increasing the packet number is correct. The SCR of the following packs
888 is calculated from the packet_number and it has to include the padding
889 sector (it represents the sector index, not the MPEG pack index)
890 (see VCD standard p. IV-6)*/
894 static int remove_decoded_packets(AVFormatContext *ctx, int64_t scr){
895 // MpegMuxContext *s = ctx->priv_data;
898 for(i=0; i<ctx->nb_streams; i++){
899 AVStream *st = ctx->streams[i];
900 StreamInfo *stream = st->priv_data;
901 PacketDesc *pkt_desc;
903 while((pkt_desc= stream->predecode_packet)
904 && scr > pkt_desc->dts){ //FIXME > vs >=
905 if(stream->buffer_index < pkt_desc->size ||
906 stream->predecode_packet == stream->premux_packet){
907 av_log(ctx, AV_LOG_ERROR,
908 "buffer underflow i=%d bufi=%d size=%d\n",
909 i, stream->buffer_index, pkt_desc->size);
912 stream->buffer_index -= pkt_desc->size;
914 stream->predecode_packet= pkt_desc->next;
922 static int output_packet(AVFormatContext *ctx, int flush){
923 MpegMuxContext *s = ctx->priv_data;
926 int i, avail_space=0, es_size, trailer_size;
928 int best_score= INT_MIN;
929 int ignore_constraints=0;
930 int64_t scr= s->last_scr;
931 PacketDesc *timestamp_packet;
932 const int64_t max_delay= av_rescale(ctx->max_delay, 90000, AV_TIME_BASE);
935 for(i=0; i<ctx->nb_streams; i++){
936 AVStream *st = ctx->streams[i];
937 StreamInfo *stream = st->priv_data;
938 const int avail_data= av_fifo_size(stream->fifo);
939 const int space= stream->max_buffer_size - stream->buffer_index;
940 int rel_space= 1024*space / stream->max_buffer_size;
941 PacketDesc *next_pkt= stream->premux_packet;
943 /* for subtitle, a single PES packet must be generated,
944 so we flush after every single subtitle packet */
945 if(s->packet_size > avail_data && !flush
946 && st->codec->codec_type != AVMEDIA_TYPE_SUBTITLE)
950 assert(avail_data>0);
952 if(space < s->packet_size && !ignore_constraints)
955 if(next_pkt && next_pkt->dts - scr > max_delay)
958 if(rel_space > best_score){
959 best_score= rel_space;
966 int64_t best_dts= INT64_MAX;
968 for(i=0; i<ctx->nb_streams; i++){
969 AVStream *st = ctx->streams[i];
970 StreamInfo *stream = st->priv_data;
971 PacketDesc *pkt_desc= stream->predecode_packet;
972 if(pkt_desc && pkt_desc->dts < best_dts)
973 best_dts= pkt_desc->dts;
976 av_dlog(ctx, "bumping scr, scr:%f, dts:%f\n",
977 scr / 90000.0, best_dts / 90000.0);
978 if(best_dts == INT64_MAX)
981 if(scr >= best_dts+1 && !ignore_constraints){
982 av_log(ctx, AV_LOG_ERROR, "packet too large, ignoring buffer limits to mux it\n");
983 ignore_constraints= 1;
985 scr= FFMAX(best_dts+1, scr);
986 if(remove_decoded_packets(ctx, scr) < 0)
993 st = ctx->streams[best_i];
994 stream = st->priv_data;
996 assert(av_fifo_size(stream->fifo) > 0);
998 assert(avail_space >= s->packet_size || ignore_constraints);
1000 timestamp_packet= stream->premux_packet;
1001 if(timestamp_packet->unwritten_size == timestamp_packet->size){
1004 trailer_size= timestamp_packet->unwritten_size;
1005 timestamp_packet= timestamp_packet->next;
1008 if(timestamp_packet){
1009 av_dlog(ctx, "dts:%f pts:%f scr:%f stream:%d\n",
1010 timestamp_packet->dts / 90000.0,
1011 timestamp_packet->pts / 90000.0,
1012 scr / 90000.0, best_i);
1013 es_size= flush_packet(ctx, best_i, timestamp_packet->pts, timestamp_packet->dts, scr, trailer_size);
1015 assert(av_fifo_size(stream->fifo) == trailer_size);
1016 es_size= flush_packet(ctx, best_i, AV_NOPTS_VALUE, AV_NOPTS_VALUE, scr, trailer_size);
1020 /* Write one or more padding sectors, if necessary, to reach
1021 the constant overall bitrate.*/
1024 while((vcd_pad_bytes = get_vcd_padding_size(ctx,stream->premux_packet->pts) ) >= s->packet_size){ //FIXME pts cannot be correct here
1025 put_vcd_padding_sector(ctx);
1026 s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
1030 stream->buffer_index += es_size;
1031 s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
1033 while(stream->premux_packet && stream->premux_packet->unwritten_size <= es_size){
1034 es_size -= stream->premux_packet->unwritten_size;
1035 stream->premux_packet= stream->premux_packet->next;
1038 stream->premux_packet->unwritten_size -= es_size;
1040 if(remove_decoded_packets(ctx, s->last_scr) < 0)
1046 static int mpeg_mux_write_packet(AVFormatContext *ctx, AVPacket *pkt)
1048 MpegMuxContext *s = ctx->priv_data;
1049 int stream_index= pkt->stream_index;
1050 int size= pkt->size;
1051 uint8_t *buf= pkt->data;
1052 AVStream *st = ctx->streams[stream_index];
1053 StreamInfo *stream = st->priv_data;
1055 PacketDesc *pkt_desc;
1057 const int is_iframe = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && (pkt->flags & AV_PKT_FLAG_KEY);
1059 preload = av_rescale(s->preload, 90000, AV_TIME_BASE);
1064 if(pts != AV_NOPTS_VALUE) pts += 2*preload;
1065 if(dts != AV_NOPTS_VALUE){
1067 s->last_scr= dts + preload;
1071 av_dlog(ctx, "dts:%f pts:%f flags:%d stream:%d nopts:%d\n",
1072 dts / 90000.0, pts / 90000.0, pkt->flags,
1073 pkt->stream_index, pts != AV_NOPTS_VALUE);
1074 if (!stream->premux_packet)
1075 stream->next_packet = &stream->premux_packet;
1076 *stream->next_packet=
1077 pkt_desc= av_mallocz(sizeof(PacketDesc));
1080 pkt_desc->unwritten_size=
1081 pkt_desc->size= size;
1082 if(!stream->predecode_packet)
1083 stream->predecode_packet= pkt_desc;
1084 stream->next_packet= &pkt_desc->next;
1086 if (av_fifo_realloc2(stream->fifo, av_fifo_size(stream->fifo) + size) < 0)
1090 if (is_iframe && (s->packet_number == 0 || (pts - stream->vobu_start_pts >= 36000))) { // min VOBU length 0.4 seconds (mpucoder)
1091 stream->bytes_to_iframe = av_fifo_size(stream->fifo);
1092 stream->align_iframe = 1;
1093 stream->vobu_start_pts = pts;
1097 av_fifo_generic_write(stream->fifo, buf, size, NULL);
1100 int ret= output_packet(ctx, 0);
1106 static int mpeg_mux_end(AVFormatContext *ctx)
1108 // MpegMuxContext *s = ctx->priv_data;
1113 int ret= output_packet(ctx, 1);
1120 /* End header according to MPEG1 systems standard. We do not write
1121 it as it is usually not needed by decoders and because it
1122 complicates MPEG stream concatenation. */
1123 //avio_wb32(ctx->pb, ISO_11172_END_CODE);
1124 //avio_flush(ctx->pb);
1126 for(i=0;i<ctx->nb_streams;i++) {
1127 stream = ctx->streams[i]->priv_data;
1129 assert(av_fifo_size(stream->fifo) == 0);
1130 av_fifo_free(stream->fifo);
1135 #define OFFSET(x) offsetof(MpegMuxContext, x)
1136 #define E AV_OPT_FLAG_ENCODING_PARAM
1137 static const AVOption options[] = {
1138 { "muxrate", NULL, OFFSET(mux_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1139 { "preload", "Initial demux-decode delay in microseconds.", OFFSET(preload), AV_OPT_TYPE_INT, {.i64 = 500000}, 0, INT_MAX, E},
1143 #define MPEGENC_CLASS(flavor)\
1144 static const AVClass flavor ## _class = {\
1145 .class_name = #flavor " muxer",\
1146 .item_name = av_default_item_name,\
1147 .version = LIBAVUTIL_VERSION_INT,\
1151 #if CONFIG_MPEG1SYSTEM_MUXER
1153 AVOutputFormat ff_mpeg1system_muxer = {
1155 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 Systems / MPEG program stream"),
1156 .mime_type = "video/mpeg",
1157 .extensions = "mpg,mpeg",
1158 .priv_data_size = sizeof(MpegMuxContext),
1159 .audio_codec = AV_CODEC_ID_MP2,
1160 .video_codec = AV_CODEC_ID_MPEG1VIDEO,
1161 .write_header = mpeg_mux_init,
1162 .write_packet = mpeg_mux_write_packet,
1163 .write_trailer = mpeg_mux_end,
1164 .priv_class = &mpeg_class,
1167 #if CONFIG_MPEG1VCD_MUXER
1169 AVOutputFormat ff_mpeg1vcd_muxer = {
1171 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 Systems / MPEG program stream (VCD)"),
1172 .mime_type = "video/mpeg",
1173 .priv_data_size = sizeof(MpegMuxContext),
1174 .audio_codec = AV_CODEC_ID_MP2,
1175 .video_codec = AV_CODEC_ID_MPEG1VIDEO,
1176 .write_header = mpeg_mux_init,
1177 .write_packet = mpeg_mux_write_packet,
1178 .write_trailer = mpeg_mux_end,
1179 .priv_class = &vcd_class,
1182 #if CONFIG_MPEG2VOB_MUXER
1184 AVOutputFormat ff_mpeg2vob_muxer = {
1186 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (VOB)"),
1187 .mime_type = "video/mpeg",
1188 .extensions = "vob",
1189 .priv_data_size = sizeof(MpegMuxContext),
1190 .audio_codec = AV_CODEC_ID_MP2,
1191 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1192 .write_header = mpeg_mux_init,
1193 .write_packet = mpeg_mux_write_packet,
1194 .write_trailer = mpeg_mux_end,
1195 .priv_class = &vob_class,
1199 /* Same as mpeg2vob_mux except that the pack size is 2324 */
1200 #if CONFIG_MPEG2SVCD_MUXER
1202 AVOutputFormat ff_mpeg2svcd_muxer = {
1204 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (SVCD)"),
1205 .mime_type = "video/mpeg",
1206 .extensions = "vob",
1207 .priv_data_size = sizeof(MpegMuxContext),
1208 .audio_codec = AV_CODEC_ID_MP2,
1209 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1210 .write_header = mpeg_mux_init,
1211 .write_packet = mpeg_mux_write_packet,
1212 .write_trailer = mpeg_mux_end,
1213 .priv_class = &svcd_class,
1217 /* Same as mpeg2vob_mux except the 'is_dvd' flag is set to produce NAV pkts */
1218 #if CONFIG_MPEG2DVD_MUXER
1220 AVOutputFormat ff_mpeg2dvd_muxer = {
1222 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (DVD VOB)"),
1223 .mime_type = "video/mpeg",
1224 .extensions = "dvd",
1225 .priv_data_size = sizeof(MpegMuxContext),
1226 .audio_codec = AV_CODEC_ID_MP2,
1227 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1228 .write_header = mpeg_mux_init,
1229 .write_packet = mpeg_mux_write_packet,
1230 .write_trailer = mpeg_mux_end,
1231 .priv_class = &dvd_class,