3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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/attributes.h"
23 #include "libavutil/fifo.h"
24 #include "libavutil/log.h"
25 #include "libavutil/mathematics.h"
26 #include "libavutil/opt.h"
27 #include "libavcodec/put_bits.h"
32 #define MAX_PAYLOAD_SIZE 4096
37 typedef struct PacketDesc {
43 struct PacketDesc *next;
49 int max_buffer_size; /* in bytes */
51 PacketDesc *predecode_packet;
52 PacketDesc *premux_packet;
53 PacketDesc **next_packet;
55 uint8_t lpcm_header[3];
59 int64_t vobu_start_pts;
64 int packet_size; /* required packet size */
66 int pack_header_freq; /* frequency (in packets^-1) at which we send pack headers */
67 int system_header_freq;
68 int system_header_size;
69 int user_mux_rate; /* bitrate in units of bits/s */
70 int mux_rate; /* bitrate in units of 50 bytes/s */
78 int64_t last_scr; /* current system clock */
80 double vcd_padding_bitrate; //FIXME floats
81 int64_t vcd_padding_bytes_written;
86 extern AVOutputFormat ff_mpeg1vcd_muxer;
87 extern AVOutputFormat ff_mpeg2dvd_muxer;
88 extern AVOutputFormat ff_mpeg2svcd_muxer;
89 extern AVOutputFormat ff_mpeg2vob_muxer;
91 static int put_pack_header(AVFormatContext *ctx,
92 uint8_t *buf, int64_t timestamp)
94 MpegMuxContext *s = ctx->priv_data;
97 init_put_bits(&pb, buf, 128);
99 put_bits32(&pb, PACK_START_CODE);
101 put_bits(&pb, 2, 0x1);
103 put_bits(&pb, 4, 0x2);
105 put_bits(&pb, 3, (uint32_t)((timestamp >> 30) & 0x07));
107 put_bits(&pb, 15, (uint32_t)((timestamp >> 15) & 0x7fff));
109 put_bits(&pb, 15, (uint32_t)((timestamp ) & 0x7fff));
112 /* clock extension */
116 put_bits(&pb, 22, s->mux_rate);
120 put_bits(&pb, 5, 0x1f); /* reserved */
121 put_bits(&pb, 3, 0); /* stuffing length */
124 return put_bits_ptr(&pb) - pb.buf;
127 static int put_system_header(AVFormatContext *ctx, uint8_t *buf,int only_for_stream_id)
129 MpegMuxContext *s = ctx->priv_data;
130 int size, i, private_stream_coded, id;
133 init_put_bits(&pb, buf, 128);
135 put_bits32(&pb, SYSTEM_HEADER_START_CODE);
136 put_bits(&pb, 16, 0);
139 put_bits(&pb, 22, s->mux_rate); /* maximum bit rate of the multiplexed stream */
140 put_bits(&pb, 1, 1); /* marker */
141 if (s->is_vcd && only_for_stream_id==VIDEO_ID) {
142 /* This header applies only to the video stream (see VCD standard p. IV-7)*/
145 put_bits(&pb, 6, s->audio_bound);
148 /* see VCD standard, p. IV-7*/
152 put_bits(&pb, 1, 0); /* variable bitrate*/
153 put_bits(&pb, 1, 0); /* non constrainted bit stream */
156 if (s->is_vcd || s->is_dvd) {
157 /* see VCD standard p IV-7 */
158 put_bits(&pb, 1, 1); /* audio locked */
159 put_bits(&pb, 1, 1); /* video locked */
161 put_bits(&pb, 1, 0); /* audio locked */
162 put_bits(&pb, 1, 0); /* video locked */
165 put_bits(&pb, 1, 1); /* marker */
167 if (s->is_vcd && (only_for_stream_id & 0xe0) == AUDIO_ID) {
168 /* This header applies only to the audio stream (see VCD standard p. IV-7)*/
171 put_bits(&pb, 5, s->video_bound);
174 put_bits(&pb, 1, 0); /* packet_rate_restriction_flag */
175 put_bits(&pb, 7, 0x7f); /* reserved byte */
177 put_bits(&pb, 8, 0xff); /* reserved byte */
179 /* DVD-Video Stream_bound entries
180 id (0xB9) video, maximum P-STD for stream 0xE0. (P-STD_buffer_bound_scale = 1)
181 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)
182 id (0xBD) private stream 1 (audio other than MPEG and subpictures). (P-STD_buffer_bound_scale = 1)
183 id (0xBF) private stream 2, NAV packs, set to 2x1024. */
186 int P_STD_max_video = 0;
187 int P_STD_max_mpeg_audio = 0;
188 int P_STD_max_mpeg_PS1 = 0;
190 for(i=0;i<ctx->nb_streams;i++) {
191 StreamInfo *stream = ctx->streams[i]->priv_data;
194 if (id == 0xbd && stream->max_buffer_size > P_STD_max_mpeg_PS1) {
195 P_STD_max_mpeg_PS1 = stream->max_buffer_size;
196 } else if (id >= 0xc0 && id <= 0xc7 && stream->max_buffer_size > P_STD_max_mpeg_audio) {
197 P_STD_max_mpeg_audio = stream->max_buffer_size;
198 } else if (id == 0xe0 && stream->max_buffer_size > P_STD_max_video) {
199 P_STD_max_video = stream->max_buffer_size;
204 put_bits(&pb, 8, 0xb9); /* stream ID */
207 put_bits(&pb, 13, P_STD_max_video / 1024);
210 if (P_STD_max_mpeg_audio == 0)
211 P_STD_max_mpeg_audio = 4096;
212 put_bits(&pb, 8, 0xb8); /* stream ID */
215 put_bits(&pb, 13, P_STD_max_mpeg_audio / 128);
217 /* private stream 1 */
218 put_bits(&pb, 8, 0xbd); /* stream ID */
221 put_bits(&pb, 13, P_STD_max_mpeg_PS1 / 128);
223 /* private stream 2 */
224 put_bits(&pb, 8, 0xbf); /* stream ID */
227 put_bits(&pb, 13, 2);
230 /* audio stream info */
231 private_stream_coded = 0;
232 for(i=0;i<ctx->nb_streams;i++) {
233 StreamInfo *stream = ctx->streams[i]->priv_data;
236 /* For VCDs, only include the stream info for the stream
237 that the pack which contains this system belongs to.
238 (see VCD standard p. IV-7) */
239 if ( !s->is_vcd || stream->id==only_for_stream_id
240 || only_for_stream_id==0) {
244 /* special case for private streams (AC-3 uses that) */
245 if (private_stream_coded)
247 private_stream_coded = 1;
250 put_bits(&pb, 8, id); /* stream ID */
255 put_bits(&pb, 13, stream->max_buffer_size / 128);
259 put_bits(&pb, 13, stream->max_buffer_size / 1024);
266 size = put_bits_ptr(&pb) - pb.buf;
267 /* patch packet size */
268 AV_WB16(buf + 4, size - 6);
273 static int get_system_header_size(AVFormatContext *ctx)
275 int buf_index, i, private_stream_coded;
277 MpegMuxContext *s = ctx->priv_data;
280 return 18; // DVD-Video system headers are 18 bytes fixed length.
283 private_stream_coded = 0;
284 for(i=0;i<ctx->nb_streams;i++) {
285 stream = ctx->streams[i]->priv_data;
286 if (stream->id < 0xc0) {
287 if (private_stream_coded)
289 private_stream_coded = 1;
296 static av_cold int mpeg_mux_init(AVFormatContext *ctx)
298 MpegMuxContext *s = ctx->priv_data;
299 int bitrate, i, mpa_id, mpv_id, mps_id, ac3_id, dts_id, lpcm_id, j;
305 s->packet_number = 0;
306 s->is_vcd = (CONFIG_MPEG1VCD_MUXER && ctx->oformat == &ff_mpeg1vcd_muxer);
307 s->is_svcd = (CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &ff_mpeg2svcd_muxer);
308 s->is_mpeg2 = ((CONFIG_MPEG2VOB_MUXER && ctx->oformat == &ff_mpeg2vob_muxer) ||
309 (CONFIG_MPEG2DVD_MUXER && ctx->oformat == &ff_mpeg2dvd_muxer) ||
310 (CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &ff_mpeg2svcd_muxer));
311 s->is_dvd = (CONFIG_MPEG2DVD_MUXER && ctx->oformat == &ff_mpeg2dvd_muxer);
313 if(ctx->packet_size) {
314 if (ctx->packet_size < 20 || ctx->packet_size > (1 << 23) + 10) {
315 av_log(ctx, AV_LOG_ERROR, "Invalid packet size %d\n",
319 s->packet_size = ctx->packet_size;
321 s->packet_size = 2048;
322 if (ctx->max_delay < 0) /* Not set by the caller */
323 ctx->max_delay = 0.7*AV_TIME_BASE;
325 s->vcd_padding_bytes_written = 0;
326 s->vcd_padding_bitrate=0;
336 for(i=0;i<ctx->nb_streams;i++) {
337 st = ctx->streams[i];
338 stream = av_mallocz(sizeof(StreamInfo));
341 st->priv_data = stream;
343 avpriv_set_pts_info(st, 64, 1, 90000);
345 switch(st->codec->codec_type) {
346 case AVMEDIA_TYPE_AUDIO:
347 if (st->codec->codec_id == AV_CODEC_ID_AC3) {
348 stream->id = ac3_id++;
349 } else if (st->codec->codec_id == AV_CODEC_ID_DTS) {
350 stream->id = dts_id++;
351 } else if (st->codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
352 stream->id = lpcm_id++;
353 for(j = 0; j < 4; j++) {
354 if (lpcm_freq_tab[j] == st->codec->sample_rate)
359 if (st->codec->channels > 8)
361 stream->lpcm_header[0] = 0x0c;
362 stream->lpcm_header[1] = (st->codec->channels - 1) | (j << 4);
363 stream->lpcm_header[2] = 0x80;
364 stream->lpcm_align = st->codec->channels * 2;
366 stream->id = mpa_id++;
369 /* This value HAS to be used for VCD (see VCD standard, p. IV-7).
370 Right now it is also used for everything else.*/
371 stream->max_buffer_size = 4 * 1024;
374 case AVMEDIA_TYPE_VIDEO:
375 stream->id = mpv_id++;
376 if (st->codec->rc_buffer_size)
377 stream->max_buffer_size = 6*1024 + st->codec->rc_buffer_size/8;
379 av_log(ctx, AV_LOG_WARNING, "VBV buffer size not set, muxing may fail\n");
380 stream->max_buffer_size = 230*1024; //FIXME this is probably too small as default
382 if (stream->max_buffer_size > 1024 * 8191) {
383 av_log(ctx, AV_LOG_WARNING, "buffer size %d, too large\n", stream->max_buffer_size);
384 stream->max_buffer_size = 1024 * 8191;
388 case AVMEDIA_TYPE_SUBTITLE:
389 stream->id = mps_id++;
390 stream->max_buffer_size = 16 * 1024;
395 stream->fifo= av_fifo_alloc(16);
402 for(i=0;i<ctx->nb_streams;i++) {
404 st = ctx->streams[i];
405 stream = (StreamInfo*) st->priv_data;
407 if(st->codec->rc_max_rate || stream->id==VIDEO_ID)
408 codec_rate= st->codec->rc_max_rate;
410 codec_rate= st->codec->bit_rate;
413 codec_rate= (1<<21)*8*50/ctx->nb_streams;
415 bitrate += codec_rate;
417 if ((stream->id & 0xe0) == AUDIO_ID)
418 audio_bitrate += codec_rate;
419 else if (stream->id==VIDEO_ID)
420 video_bitrate += codec_rate;
423 if (s->user_mux_rate) {
424 s->mux_rate = (s->user_mux_rate + (8 * 50) - 1) / (8 * 50);
426 /* we increase slightly the bitrate to take into account the
427 headers. XXX: compute it exactly */
428 bitrate += bitrate / 20;
430 s->mux_rate = (bitrate + (8 * 50) - 1) / (8 * 50);
431 if (s->mux_rate >= (1<<22)) {
432 av_log(ctx, AV_LOG_WARNING, "mux rate %d is too large\n", s->mux_rate);
433 s->mux_rate = (1<<22) - 1;
438 double overhead_rate;
440 /* The VCD standard mandates that the mux_rate field is 3528
441 (see standard p. IV-6).
442 The value is actually "wrong", i.e. if you calculate
443 it using the normal formula and the 75 sectors per second transfer
444 rate you get a different value because the real pack size is 2324,
445 not 2352. But the standard explicitly specifies that the mux_rate
446 field in the header must have this value.*/
447 // s->mux_rate=2352 * 75 / 50; /* = 3528*/
449 /* The VCD standard states that the muxed stream must be
450 exactly 75 packs / second (the data rate of a single speed cdrom).
451 Since the video bitrate (probably 1150000 bits/sec) will be below
452 the theoretical maximum we have to add some padding packets
453 to make up for the lower data rate.
454 (cf. VCD standard p. IV-6 )*/
456 /* Add the header overhead to the data rate.
457 2279 data bytes per audio pack, 2294 data bytes per video pack*/
458 overhead_rate = ((audio_bitrate / 8.0) / 2279) * (2324 - 2279);
459 overhead_rate += ((video_bitrate / 8.0) / 2294) * (2324 - 2294);
462 /* Add padding so that the full bitrate is 2324*75 bytes/sec */
463 s->vcd_padding_bitrate = 2324 * 75 * 8 - (bitrate + overhead_rate);
466 if (s->is_vcd || s->is_mpeg2)
468 s->pack_header_freq = 1;
470 /* every 2 seconds */
471 s->pack_header_freq = 2 * bitrate / s->packet_size / 8;
473 /* the above seems to make pack_header_freq zero sometimes */
474 if (s->pack_header_freq == 0)
475 s->pack_header_freq = 1;
478 /* every 200 packets. Need to look at the spec. */
479 s->system_header_freq = s->pack_header_freq * 40;
481 /* the standard mandates that there are only two system headers
482 in the whole file: one in the first packet of each stream.
483 (see standard p. IV-7 and IV-8) */
484 s->system_header_freq = 0x7fffffff;
486 s->system_header_freq = s->pack_header_freq * 5;
488 for(i=0;i<ctx->nb_streams;i++) {
489 stream = ctx->streams[i]->priv_data;
490 stream->packet_number = 0;
492 s->system_header_size = get_system_header_size(ctx);
493 s->last_scr = AV_NOPTS_VALUE;
496 for(i=0;i<ctx->nb_streams;i++) {
497 av_free(ctx->streams[i]->priv_data);
499 return AVERROR(ENOMEM);
502 static inline void put_timestamp(AVIOContext *pb, int id, int64_t timestamp)
506 (((timestamp >> 30) & 0x07) << 1) |
508 avio_wb16(pb, (uint16_t)((((timestamp >> 15) & 0x7fff) << 1) | 1));
509 avio_wb16(pb, (uint16_t)((((timestamp ) & 0x7fff) << 1) | 1));
513 /* return the number of padding bytes that should be inserted into
514 the multiplexed stream.*/
515 static int get_vcd_padding_size(AVFormatContext *ctx, int64_t pts)
517 MpegMuxContext *s = ctx->priv_data;
520 if (s->vcd_padding_bitrate > 0 && pts!=AV_NOPTS_VALUE)
522 int64_t full_pad_bytes;
524 full_pad_bytes = (int64_t)((s->vcd_padding_bitrate * (pts / 90000.0)) / 8.0); //FIXME this is wrong
525 pad_bytes = (int) (full_pad_bytes - s->vcd_padding_bytes_written);
528 /* might happen if we have already padded to a later timestamp. This
529 can occur if another stream has already advanced further.*/
537 /* Write an MPEG padding packet header. */
538 static void put_padding_packet(AVFormatContext *ctx, AVIOContext *pb,int packet_bytes)
540 MpegMuxContext *s = ctx->priv_data;
543 avio_wb32(pb, PADDING_STREAM);
544 avio_wb16(pb, packet_bytes - 6);
551 for(i=0;i<packet_bytes;i++)
555 static int get_nb_frames(AVFormatContext *ctx, StreamInfo *stream, int len){
557 PacketDesc *pkt_desc= stream->premux_packet;
560 if(pkt_desc->size == pkt_desc->unwritten_size)
562 len -= pkt_desc->unwritten_size;
563 pkt_desc= pkt_desc->next;
569 /* flush the packet on stream stream_index */
570 static int flush_packet(AVFormatContext *ctx, int stream_index,
571 int64_t pts, int64_t dts, int64_t scr, int trailer_size)
573 MpegMuxContext *s = ctx->priv_data;
574 StreamInfo *stream = ctx->streams[stream_index]->priv_data;
576 int size, payload_size, startcode, id, stuffing_size, i, header_len;
579 int zero_trail_bytes = 0;
580 int pad_packet_bytes = 0;
582 int general_pack = 0; /*"general" pack without data specific to one stream?*/
587 av_dlog(ctx, "packet ID=%2x PTS=%0.3f\n", id, pts / 90000.0);
591 if ((s->packet_number % s->pack_header_freq) == 0 || s->last_scr != scr) {
592 /* output pack and systems header if needed */
593 size = put_pack_header(ctx, buf_ptr, scr);
598 /* there is exactly one system header for each stream in a VCD MPEG,
599 One in the very first video packet and one in the very first
600 audio packet (see VCD standard p. IV-7 and IV-8).*/
602 if (stream->packet_number==0) {
603 size = put_system_header(ctx, buf_ptr, id);
606 } else if (s->is_dvd) {
607 if (stream->align_iframe || s->packet_number == 0){
608 int PES_bytes_to_fill = s->packet_size - size - 10;
610 if (pts != AV_NOPTS_VALUE) {
612 PES_bytes_to_fill -= 5 + 5;
614 PES_bytes_to_fill -= 5;
617 if (stream->bytes_to_iframe == 0 || s->packet_number == 0) {
618 size = put_system_header(ctx, buf_ptr, 0);
620 size = buf_ptr - buffer;
621 avio_write(ctx->pb, buffer, size);
623 avio_wb32(ctx->pb, PRIVATE_STREAM_2);
624 avio_wb16(ctx->pb, 0x03d4); // length
625 avio_w8(ctx->pb, 0x00); // substream ID, 00=PCI
626 for (i = 0; i < 979; i++)
627 avio_w8(ctx->pb, 0x00);
629 avio_wb32(ctx->pb, PRIVATE_STREAM_2);
630 avio_wb16(ctx->pb, 0x03fa); // length
631 avio_w8(ctx->pb, 0x01); // substream ID, 01=DSI
632 for (i = 0; i < 1017; i++)
633 avio_w8(ctx->pb, 0x00);
635 memset(buffer, 0, 128);
638 stream->align_iframe = 0;
639 scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
640 size = put_pack_header(ctx, buf_ptr, scr);
644 } else if (stream->bytes_to_iframe < PES_bytes_to_fill) {
645 pad_packet_bytes = PES_bytes_to_fill - stream->bytes_to_iframe;
649 if ((s->packet_number % s->system_header_freq) == 0) {
650 size = put_system_header(ctx, buf_ptr, 0);
655 size = buf_ptr - buffer;
656 avio_write(ctx->pb, buffer, size);
658 packet_size = s->packet_size - size;
660 if (s->is_vcd && (id & 0xe0) == AUDIO_ID)
661 /* The VCD standard demands that 20 zero bytes follow
662 each audio pack (see standard p. IV-8).*/
663 zero_trail_bytes += 20;
665 if ((s->is_vcd && stream->packet_number==0)
666 || (s->is_svcd && s->packet_number==0)) {
667 /* for VCD the first pack of each stream contains only the pack header,
668 the system header and lots of padding (see VCD standard p. IV-6).
669 In the case of an audio pack, 20 zero bytes are also added at
671 /* For SVCD we fill the very first pack to increase compatibility with
672 some DVD players. Not mandated by the standard.*/
674 general_pack = 1; /* the system header refers to both streams and no stream data*/
675 pad_packet_bytes = packet_size - zero_trail_bytes;
678 packet_size -= pad_packet_bytes + zero_trail_bytes;
680 if (packet_size > 0) {
682 /* packet header size */
688 if (stream->packet_number==0)
689 header_len += 3; /* PES extension */
690 header_len += 1; /* obligatory stuffing byte */
694 if (pts != AV_NOPTS_VALUE) {
704 payload_size = packet_size - header_len;
706 startcode = PRIVATE_STREAM_1;
714 startcode = 0x100 + id;
717 stuffing_size = payload_size - av_fifo_size(stream->fifo);
719 // first byte does not fit -> reset pts/dts + stuffing
720 if(payload_size <= trailer_size && pts != AV_NOPTS_VALUE){
724 if(pts != AV_NOPTS_VALUE)
725 timestamp_len += s->is_mpeg2 ? 5 : 4;
726 pts=dts= AV_NOPTS_VALUE;
727 header_len -= timestamp_len;
728 if (s->is_dvd && stream->align_iframe) {
729 pad_packet_bytes += timestamp_len;
730 packet_size -= timestamp_len;
732 payload_size += timestamp_len;
734 stuffing_size += timestamp_len;
735 if(payload_size > trailer_size)
736 stuffing_size += payload_size - trailer_size;
739 if (pad_packet_bytes > 0 && pad_packet_bytes <= 7) { // can't use padding, so use stuffing
740 packet_size += pad_packet_bytes;
741 payload_size += pad_packet_bytes; // undo the previous adjustment
742 if (stuffing_size < 0) {
743 stuffing_size = pad_packet_bytes;
745 stuffing_size += pad_packet_bytes;
747 pad_packet_bytes = 0;
750 if (stuffing_size < 0)
753 if (startcode == PRIVATE_STREAM_1 && id >= 0xa0) {
754 if (payload_size < av_fifo_size(stream->fifo))
755 stuffing_size += payload_size % stream->lpcm_align;
758 if (stuffing_size > 16) { /*<=16 for MPEG-1, <=32 for MPEG-2*/
759 pad_packet_bytes += stuffing_size;
760 packet_size -= stuffing_size;
761 payload_size -= stuffing_size;
765 nb_frames= get_nb_frames(ctx, stream, payload_size - stuffing_size);
767 avio_wb32(ctx->pb, startcode);
769 avio_wb16(ctx->pb, packet_size);
772 for(i=0;i<stuffing_size;i++)
773 avio_w8(ctx->pb, 0xff);
776 avio_w8(ctx->pb, 0x80); /* mpeg2 id */
780 if (pts != AV_NOPTS_VALUE) {
786 /* Both the MPEG-2 and the SVCD standards demand that the
787 P-STD_buffer_size field be included in the first packet of
788 every stream. (see SVCD standard p. 26 V.2.3.1 and V.2.3.2
789 and MPEG-2 standard 2.7.7) */
790 if (stream->packet_number == 0)
793 avio_w8(ctx->pb, pes_flags); /* flags */
794 avio_w8(ctx->pb, header_len - 3 + stuffing_size);
796 if (pes_flags & 0x80) /*write pts*/
797 put_timestamp(ctx->pb, (pes_flags & 0x40) ? 0x03 : 0x02, pts);
798 if (pes_flags & 0x40) /*write dts*/
799 put_timestamp(ctx->pb, 0x01, dts);
801 if (pes_flags & 0x01) { /*write pes extension*/
802 avio_w8(ctx->pb, 0x10); /* flags */
804 /* P-STD buffer info */
805 if ((id & 0xe0) == AUDIO_ID)
806 avio_wb16(ctx->pb, 0x4000 | stream->max_buffer_size/ 128);
808 avio_wb16(ctx->pb, 0x6000 | stream->max_buffer_size/1024);
812 if (pts != AV_NOPTS_VALUE) {
814 put_timestamp(ctx->pb, 0x03, pts);
815 put_timestamp(ctx->pb, 0x01, dts);
817 put_timestamp(ctx->pb, 0x02, pts);
820 avio_w8(ctx->pb, 0x0f);
825 /* special stuffing byte that is always written
826 to prevent accidental generation of start codes. */
827 avio_w8(ctx->pb, 0xff);
829 for(i=0;i<stuffing_size;i++)
830 avio_w8(ctx->pb, 0xff);
833 if (startcode == PRIVATE_STREAM_1) {
834 avio_w8(ctx->pb, id);
836 /* LPCM (XXX: check nb_frames) */
838 avio_wb16(ctx->pb, 4); /* skip 3 header bytes */
839 avio_w8(ctx->pb, stream->lpcm_header[0]);
840 avio_w8(ctx->pb, stream->lpcm_header[1]);
841 avio_w8(ctx->pb, stream->lpcm_header[2]);
842 } else if (id >= 0x40) {
844 avio_w8(ctx->pb, nb_frames);
845 avio_wb16(ctx->pb, trailer_size+1);
850 assert(payload_size - stuffing_size <= av_fifo_size(stream->fifo));
851 av_fifo_generic_read(stream->fifo, ctx->pb, payload_size - stuffing_size, (void*)avio_write);
852 stream->bytes_to_iframe -= payload_size - stuffing_size;
858 if (pad_packet_bytes > 0)
859 put_padding_packet(ctx,ctx->pb, pad_packet_bytes);
861 for(i=0;i<zero_trail_bytes;i++)
862 avio_w8(ctx->pb, 0x00);
868 /* only increase the stream packet number if this pack actually contains
869 something that is specific to this stream! I.e. a dedicated header
872 stream->packet_number++;
874 return payload_size - stuffing_size;
877 static void put_vcd_padding_sector(AVFormatContext *ctx)
879 /* There are two ways to do this padding: writing a sector/pack
880 of 0 values, or writing an MPEG padding pack. Both seem to
881 work with most decoders, BUT the VCD standard only allows a 0-sector
882 (see standard p. IV-4, IV-5).
883 So a 0-sector it is...*/
885 MpegMuxContext *s = ctx->priv_data;
888 for(i=0;i<s->packet_size;i++)
891 s->vcd_padding_bytes_written += s->packet_size;
895 /* increasing the packet number is correct. The SCR of the following packs
896 is calculated from the packet_number and it has to include the padding
897 sector (it represents the sector index, not the MPEG pack index)
898 (see VCD standard p. IV-6)*/
902 static int remove_decoded_packets(AVFormatContext *ctx, int64_t scr){
903 // MpegMuxContext *s = ctx->priv_data;
906 for(i=0; i<ctx->nb_streams; i++){
907 AVStream *st = ctx->streams[i];
908 StreamInfo *stream = st->priv_data;
909 PacketDesc *pkt_desc;
911 while((pkt_desc= stream->predecode_packet)
912 && scr > pkt_desc->dts){ //FIXME > vs >=
913 if(stream->buffer_index < pkt_desc->size ||
914 stream->predecode_packet == stream->premux_packet){
915 av_log(ctx, AV_LOG_ERROR,
916 "buffer underflow st=%d bufi=%d size=%d\n",
917 i, stream->buffer_index, pkt_desc->size);
920 stream->buffer_index -= pkt_desc->size;
922 stream->predecode_packet= pkt_desc->next;
930 static int output_packet(AVFormatContext *ctx, int flush){
931 MpegMuxContext *s = ctx->priv_data;
934 int i, avail_space=0, es_size, trailer_size;
936 int best_score= INT_MIN;
937 int ignore_constraints=0;
938 int64_t scr= s->last_scr;
939 PacketDesc *timestamp_packet;
940 const int64_t max_delay= av_rescale(ctx->max_delay, 90000, AV_TIME_BASE);
943 for(i=0; i<ctx->nb_streams; i++){
944 AVStream *st = ctx->streams[i];
945 StreamInfo *stream = st->priv_data;
946 const int avail_data= av_fifo_size(stream->fifo);
947 const int space= stream->max_buffer_size - stream->buffer_index;
948 int rel_space= 1024LL*space / stream->max_buffer_size;
949 PacketDesc *next_pkt= stream->premux_packet;
951 /* for subtitle, a single PES packet must be generated,
952 so we flush after every single subtitle packet */
953 if(s->packet_size > avail_data && !flush
954 && st->codec->codec_type != AVMEDIA_TYPE_SUBTITLE)
958 av_assert0(avail_data>0);
960 if(space < s->packet_size && !ignore_constraints)
963 if(next_pkt && next_pkt->dts - scr > max_delay)
965 if ( stream->predecode_packet
966 && stream->predecode_packet->size > stream->buffer_index)
968 if(rel_space > best_score){
969 best_score= rel_space;
976 int64_t best_dts= INT64_MAX;
978 for(i=0; i<ctx->nb_streams; i++){
979 AVStream *st = ctx->streams[i];
980 StreamInfo *stream = st->priv_data;
981 PacketDesc *pkt_desc= stream->predecode_packet;
982 if(pkt_desc && pkt_desc->dts < best_dts)
983 best_dts= pkt_desc->dts;
986 av_dlog(ctx, "bumping scr, scr:%f, dts:%f\n",
987 scr / 90000.0, best_dts / 90000.0);
988 if(best_dts == INT64_MAX)
991 if(scr >= best_dts+1 && !ignore_constraints){
992 av_log(ctx, AV_LOG_ERROR, "packet too large, ignoring buffer limits to mux it\n");
993 ignore_constraints= 1;
995 scr= FFMAX(best_dts+1, scr);
996 if(remove_decoded_packets(ctx, scr) < 0)
1001 assert(best_i >= 0);
1003 st = ctx->streams[best_i];
1004 stream = st->priv_data;
1006 assert(av_fifo_size(stream->fifo) > 0);
1008 assert(avail_space >= s->packet_size || ignore_constraints);
1010 timestamp_packet= stream->premux_packet;
1011 if(timestamp_packet->unwritten_size == timestamp_packet->size){
1014 trailer_size= timestamp_packet->unwritten_size;
1015 timestamp_packet= timestamp_packet->next;
1018 if(timestamp_packet){
1019 av_dlog(ctx, "dts:%f pts:%f scr:%f stream:%d\n",
1020 timestamp_packet->dts / 90000.0,
1021 timestamp_packet->pts / 90000.0,
1022 scr / 90000.0, best_i);
1023 es_size= flush_packet(ctx, best_i, timestamp_packet->pts, timestamp_packet->dts, scr, trailer_size);
1025 assert(av_fifo_size(stream->fifo) == trailer_size);
1026 es_size= flush_packet(ctx, best_i, AV_NOPTS_VALUE, AV_NOPTS_VALUE, scr, trailer_size);
1030 /* Write one or more padding sectors, if necessary, to reach
1031 the constant overall bitrate.*/
1034 while((vcd_pad_bytes = get_vcd_padding_size(ctx,stream->premux_packet->pts) ) >= s->packet_size){ //FIXME pts cannot be correct here
1035 put_vcd_padding_sector(ctx);
1036 s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
1040 stream->buffer_index += es_size;
1041 s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
1043 while(stream->premux_packet && stream->premux_packet->unwritten_size <= es_size){
1044 es_size -= stream->premux_packet->unwritten_size;
1045 stream->premux_packet= stream->premux_packet->next;
1048 stream->premux_packet->unwritten_size -= es_size;
1050 if(remove_decoded_packets(ctx, s->last_scr) < 0)
1056 static int mpeg_mux_write_packet(AVFormatContext *ctx, AVPacket *pkt)
1058 MpegMuxContext *s = ctx->priv_data;
1059 int stream_index= pkt->stream_index;
1060 int size= pkt->size;
1061 uint8_t *buf= pkt->data;
1062 AVStream *st = ctx->streams[stream_index];
1063 StreamInfo *stream = st->priv_data;
1065 PacketDesc *pkt_desc;
1067 const int is_iframe = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && (pkt->flags & AV_PKT_FLAG_KEY);
1069 preload = av_rescale(s->preload, 90000, AV_TIME_BASE);
1074 if (s->last_scr == AV_NOPTS_VALUE) {
1075 if (dts == AV_NOPTS_VALUE || (dts < preload && ctx->avoid_negative_ts) || s->is_dvd) {
1076 if (dts != AV_NOPTS_VALUE)
1077 s->preload += av_rescale(-dts, AV_TIME_BASE, 90000);
1080 s->last_scr = dts - preload;
1083 preload = av_rescale(s->preload, 90000, AV_TIME_BASE);
1084 av_log(ctx, AV_LOG_DEBUG, "First SCR: %"PRId64" First DTS: %"PRId64"\n", s->last_scr, dts + preload);
1087 if (dts != AV_NOPTS_VALUE) dts += preload;
1088 if (pts != AV_NOPTS_VALUE) pts += preload;
1090 av_dlog(ctx, "dts:%f pts:%f flags:%d stream:%d nopts:%d\n",
1091 dts / 90000.0, pts / 90000.0, pkt->flags,
1092 pkt->stream_index, pts != AV_NOPTS_VALUE);
1093 if (!stream->premux_packet)
1094 stream->next_packet = &stream->premux_packet;
1095 *stream->next_packet=
1096 pkt_desc= av_mallocz(sizeof(PacketDesc));
1099 pkt_desc->unwritten_size=
1100 pkt_desc->size= size;
1101 if(!stream->predecode_packet)
1102 stream->predecode_packet= pkt_desc;
1103 stream->next_packet= &pkt_desc->next;
1105 if (av_fifo_realloc2(stream->fifo, av_fifo_size(stream->fifo) + size) < 0)
1109 if (is_iframe && (s->packet_number == 0 || (pts - stream->vobu_start_pts >= 36000))) { // min VOBU length 0.4 seconds (mpucoder)
1110 stream->bytes_to_iframe = av_fifo_size(stream->fifo);
1111 stream->align_iframe = 1;
1112 stream->vobu_start_pts = pts;
1116 av_fifo_generic_write(stream->fifo, buf, size, NULL);
1119 int ret= output_packet(ctx, 0);
1125 static int mpeg_mux_end(AVFormatContext *ctx)
1127 // MpegMuxContext *s = ctx->priv_data;
1132 int ret= output_packet(ctx, 1);
1139 /* End header according to MPEG1 systems standard. We do not write
1140 it as it is usually not needed by decoders and because it
1141 complicates MPEG stream concatenation. */
1142 //avio_wb32(ctx->pb, ISO_11172_END_CODE);
1143 //avio_flush(ctx->pb);
1145 for(i=0;i<ctx->nb_streams;i++) {
1146 stream = ctx->streams[i]->priv_data;
1148 assert(av_fifo_size(stream->fifo) == 0);
1149 av_fifo_free(stream->fifo);
1154 #define OFFSET(x) offsetof(MpegMuxContext, x)
1155 #define E AV_OPT_FLAG_ENCODING_PARAM
1156 static const AVOption options[] = {
1157 { "muxrate", NULL, OFFSET(user_mux_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, ((1<<22) - 1) * (8 * 50), E },
1158 { "preload", "Initial demux-decode delay in microseconds.", OFFSET(preload), AV_OPT_TYPE_INT, {.i64 = 500000}, 0, INT_MAX, E},
1162 #define MPEGENC_CLASS(flavor)\
1163 static const AVClass flavor ## _class = {\
1164 .class_name = #flavor " muxer",\
1165 .item_name = av_default_item_name,\
1166 .version = LIBAVUTIL_VERSION_INT,\
1170 #if CONFIG_MPEG1SYSTEM_MUXER
1172 AVOutputFormat ff_mpeg1system_muxer = {
1174 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 Systems / MPEG program stream"),
1175 .mime_type = "video/mpeg",
1176 .extensions = "mpg,mpeg",
1177 .priv_data_size = sizeof(MpegMuxContext),
1178 .audio_codec = AV_CODEC_ID_MP2,
1179 .video_codec = AV_CODEC_ID_MPEG1VIDEO,
1180 .write_header = mpeg_mux_init,
1181 .write_packet = mpeg_mux_write_packet,
1182 .write_trailer = mpeg_mux_end,
1183 .priv_class = &mpeg_class,
1186 #if CONFIG_MPEG1VCD_MUXER
1188 AVOutputFormat ff_mpeg1vcd_muxer = {
1190 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 Systems / MPEG program stream (VCD)"),
1191 .mime_type = "video/mpeg",
1192 .priv_data_size = sizeof(MpegMuxContext),
1193 .audio_codec = AV_CODEC_ID_MP2,
1194 .video_codec = AV_CODEC_ID_MPEG1VIDEO,
1195 .write_header = mpeg_mux_init,
1196 .write_packet = mpeg_mux_write_packet,
1197 .write_trailer = mpeg_mux_end,
1198 .priv_class = &vcd_class,
1201 #if CONFIG_MPEG2VOB_MUXER
1203 AVOutputFormat ff_mpeg2vob_muxer = {
1205 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (VOB)"),
1206 .mime_type = "video/mpeg",
1207 .extensions = "vob",
1208 .priv_data_size = sizeof(MpegMuxContext),
1209 .audio_codec = AV_CODEC_ID_MP2,
1210 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1211 .write_header = mpeg_mux_init,
1212 .write_packet = mpeg_mux_write_packet,
1213 .write_trailer = mpeg_mux_end,
1214 .priv_class = &vob_class,
1218 /* Same as mpeg2vob_mux except that the pack size is 2324 */
1219 #if CONFIG_MPEG2SVCD_MUXER
1221 AVOutputFormat ff_mpeg2svcd_muxer = {
1223 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (SVCD)"),
1224 .mime_type = "video/mpeg",
1225 .extensions = "vob",
1226 .priv_data_size = sizeof(MpegMuxContext),
1227 .audio_codec = AV_CODEC_ID_MP2,
1228 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1229 .write_header = mpeg_mux_init,
1230 .write_packet = mpeg_mux_write_packet,
1231 .write_trailer = mpeg_mux_end,
1232 .priv_class = &svcd_class,
1236 /* Same as mpeg2vob_mux except the 'is_dvd' flag is set to produce NAV pkts */
1237 #if CONFIG_MPEG2DVD_MUXER
1239 AVOutputFormat ff_mpeg2dvd_muxer = {
1241 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (DVD VOB)"),
1242 .mime_type = "video/mpeg",
1243 .extensions = "dvd",
1244 .priv_data_size = sizeof(MpegMuxContext),
1245 .audio_codec = AV_CODEC_ID_MP2,
1246 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1247 .write_header = mpeg_mux_init,
1248 .write_packet = mpeg_mux_write_packet,
1249 .write_trailer = mpeg_mux_end,
1250 .priv_class = &dvd_class,