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 buf[4] = (size - 6) >> 8;
269 buf[5] = (size - 6) & 0xff;
274 static int get_system_header_size(AVFormatContext *ctx)
276 int buf_index, i, private_stream_coded;
278 MpegMuxContext *s = ctx->priv_data;
281 return 18; // DVD-Video system headers are 18 bytes fixed length.
284 private_stream_coded = 0;
285 for(i=0;i<ctx->nb_streams;i++) {
286 stream = ctx->streams[i]->priv_data;
287 if (stream->id < 0xc0) {
288 if (private_stream_coded)
290 private_stream_coded = 1;
297 static av_cold int mpeg_mux_init(AVFormatContext *ctx)
299 MpegMuxContext *s = ctx->priv_data;
300 int bitrate, i, mpa_id, mpv_id, mps_id, ac3_id, dts_id, lpcm_id, j;
306 s->packet_number = 0;
307 s->is_vcd = (CONFIG_MPEG1VCD_MUXER && ctx->oformat == &ff_mpeg1vcd_muxer);
308 s->is_svcd = (CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &ff_mpeg2svcd_muxer);
309 s->is_mpeg2 = ((CONFIG_MPEG2VOB_MUXER && ctx->oformat == &ff_mpeg2vob_muxer) ||
310 (CONFIG_MPEG2DVD_MUXER && ctx->oformat == &ff_mpeg2dvd_muxer) ||
311 (CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &ff_mpeg2svcd_muxer));
312 s->is_dvd = (CONFIG_MPEG2DVD_MUXER && ctx->oformat == &ff_mpeg2dvd_muxer);
314 if(ctx->packet_size) {
315 if (ctx->packet_size < 20 || ctx->packet_size > (1 << 23) + 10) {
316 av_log(ctx, AV_LOG_ERROR, "Invalid packet size %d\n",
320 s->packet_size = ctx->packet_size;
322 s->packet_size = 2048;
323 if (ctx->max_delay < 0) /* Not set by the caller */
326 s->vcd_padding_bytes_written = 0;
327 s->vcd_padding_bitrate=0;
337 for(i=0;i<ctx->nb_streams;i++) {
338 st = ctx->streams[i];
339 stream = av_mallocz(sizeof(StreamInfo));
342 st->priv_data = stream;
344 avpriv_set_pts_info(st, 64, 1, 90000);
346 switch(st->codec->codec_type) {
347 case AVMEDIA_TYPE_AUDIO:
348 if (st->codec->codec_id == AV_CODEC_ID_AC3) {
349 stream->id = ac3_id++;
350 } else if (st->codec->codec_id == AV_CODEC_ID_DTS) {
351 stream->id = dts_id++;
352 } else if (st->codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
353 stream->id = lpcm_id++;
354 for(j = 0; j < 4; j++) {
355 if (lpcm_freq_tab[j] == st->codec->sample_rate)
360 if (st->codec->channels > 8)
362 stream->lpcm_header[0] = 0x0c;
363 stream->lpcm_header[1] = (st->codec->channels - 1) | (j << 4);
364 stream->lpcm_header[2] = 0x80;
365 stream->lpcm_align = st->codec->channels * 2;
367 stream->id = mpa_id++;
370 /* This value HAS to be used for VCD (see VCD standard, p. IV-7).
371 Right now it is also used for everything else.*/
372 stream->max_buffer_size = 4 * 1024;
375 case AVMEDIA_TYPE_VIDEO:
376 stream->id = mpv_id++;
377 if (st->codec->rc_buffer_size)
378 stream->max_buffer_size = 6*1024 + st->codec->rc_buffer_size/8;
380 av_log(ctx, AV_LOG_WARNING, "VBV buffer size not set, muxing may fail\n");
381 stream->max_buffer_size = 230*1024; //FIXME this is probably too small as default
385 case AVMEDIA_TYPE_SUBTITLE:
386 stream->id = mps_id++;
387 stream->max_buffer_size = 16 * 1024;
392 stream->fifo= av_fifo_alloc(16);
399 for(i=0;i<ctx->nb_streams;i++) {
401 st = ctx->streams[i];
402 stream = (StreamInfo*) st->priv_data;
404 if(st->codec->rc_max_rate || stream->id==VIDEO_ID)
405 codec_rate= st->codec->rc_max_rate;
407 codec_rate= st->codec->bit_rate;
410 codec_rate= (1<<21)*8*50/ctx->nb_streams;
412 bitrate += codec_rate;
414 if ((stream->id & 0xe0) == AUDIO_ID)
415 audio_bitrate += codec_rate;
416 else if (stream->id==VIDEO_ID)
417 video_bitrate += codec_rate;
420 if (s->user_mux_rate) {
421 s->mux_rate = (s->user_mux_rate + (8 * 50) - 1) / (8 * 50);
423 /* we increase slightly the bitrate to take into account the
424 headers. XXX: compute it exactly */
425 bitrate += bitrate / 20;
427 s->mux_rate = (bitrate + (8 * 50) - 1) / (8 * 50);
431 double overhead_rate;
433 /* The VCD standard mandates that the mux_rate field is 3528
434 (see standard p. IV-6).
435 The value is actually "wrong", i.e. if you calculate
436 it using the normal formula and the 75 sectors per second transfer
437 rate you get a different value because the real pack size is 2324,
438 not 2352. But the standard explicitly specifies that the mux_rate
439 field in the header must have this value.*/
440 // s->mux_rate=2352 * 75 / 50; /* = 3528*/
442 /* The VCD standard states that the muxed stream must be
443 exactly 75 packs / second (the data rate of a single speed cdrom).
444 Since the video bitrate (probably 1150000 bits/sec) will be below
445 the theoretical maximum we have to add some padding packets
446 to make up for the lower data rate.
447 (cf. VCD standard p. IV-6 )*/
449 /* Add the header overhead to the data rate.
450 2279 data bytes per audio pack, 2294 data bytes per video pack*/
451 overhead_rate = ((audio_bitrate / 8.0) / 2279) * (2324 - 2279);
452 overhead_rate += ((video_bitrate / 8.0) / 2294) * (2324 - 2294);
455 /* Add padding so that the full bitrate is 2324*75 bytes/sec */
456 s->vcd_padding_bitrate = 2324 * 75 * 8 - (bitrate + overhead_rate);
459 if (s->is_vcd || s->is_mpeg2)
461 s->pack_header_freq = 1;
463 /* every 2 seconds */
464 s->pack_header_freq = 2 * bitrate / s->packet_size / 8;
466 /* the above seems to make pack_header_freq zero sometimes */
467 if (s->pack_header_freq == 0)
468 s->pack_header_freq = 1;
471 /* every 200 packets. Need to look at the spec. */
472 s->system_header_freq = s->pack_header_freq * 40;
474 /* the standard mandates that there are only two system headers
475 in the whole file: one in the first packet of each stream.
476 (see standard p. IV-7 and IV-8) */
477 s->system_header_freq = 0x7fffffff;
479 s->system_header_freq = s->pack_header_freq * 5;
481 for(i=0;i<ctx->nb_streams;i++) {
482 stream = ctx->streams[i]->priv_data;
483 stream->packet_number = 0;
485 s->system_header_size = get_system_header_size(ctx);
486 s->last_scr = AV_NOPTS_VALUE;
489 for(i=0;i<ctx->nb_streams;i++) {
490 av_free(ctx->streams[i]->priv_data);
492 return AVERROR(ENOMEM);
495 static inline void put_timestamp(AVIOContext *pb, int id, int64_t timestamp)
499 (((timestamp >> 30) & 0x07) << 1) |
501 avio_wb16(pb, (uint16_t)((((timestamp >> 15) & 0x7fff) << 1) | 1));
502 avio_wb16(pb, (uint16_t)((((timestamp ) & 0x7fff) << 1) | 1));
506 /* return the number of padding bytes that should be inserted into
507 the multiplexed stream.*/
508 static int get_vcd_padding_size(AVFormatContext *ctx, int64_t pts)
510 MpegMuxContext *s = ctx->priv_data;
513 if (s->vcd_padding_bitrate > 0 && pts!=AV_NOPTS_VALUE)
515 int64_t full_pad_bytes;
517 full_pad_bytes = (int64_t)((s->vcd_padding_bitrate * (pts / 90000.0)) / 8.0); //FIXME this is wrong
518 pad_bytes = (int) (full_pad_bytes - s->vcd_padding_bytes_written);
521 /* might happen if we have already padded to a later timestamp. This
522 can occur if another stream has already advanced further.*/
530 /* Write an MPEG padding packet header. */
531 static void put_padding_packet(AVFormatContext *ctx, AVIOContext *pb,int packet_bytes)
533 MpegMuxContext *s = ctx->priv_data;
536 avio_wb32(pb, PADDING_STREAM);
537 avio_wb16(pb, packet_bytes - 6);
544 for(i=0;i<packet_bytes;i++)
548 static int get_nb_frames(AVFormatContext *ctx, StreamInfo *stream, int len){
550 PacketDesc *pkt_desc= stream->premux_packet;
553 if(pkt_desc->size == pkt_desc->unwritten_size)
555 len -= pkt_desc->unwritten_size;
556 pkt_desc= pkt_desc->next;
562 /* flush the packet on stream stream_index */
563 static int flush_packet(AVFormatContext *ctx, int stream_index,
564 int64_t pts, int64_t dts, int64_t scr, int trailer_size)
566 MpegMuxContext *s = ctx->priv_data;
567 StreamInfo *stream = ctx->streams[stream_index]->priv_data;
569 int size, payload_size, startcode, id, stuffing_size, i, header_len;
572 int zero_trail_bytes = 0;
573 int pad_packet_bytes = 0;
575 int general_pack = 0; /*"general" pack without data specific to one stream?*/
580 av_dlog(ctx, "packet ID=%2x PTS=%0.3f\n", id, pts / 90000.0);
584 if ((s->packet_number % s->pack_header_freq) == 0 || s->last_scr != scr) {
585 /* output pack and systems header if needed */
586 size = put_pack_header(ctx, buf_ptr, scr);
591 /* there is exactly one system header for each stream in a VCD MPEG,
592 One in the very first video packet and one in the very first
593 audio packet (see VCD standard p. IV-7 and IV-8).*/
595 if (stream->packet_number==0) {
596 size = put_system_header(ctx, buf_ptr, id);
599 } else if (s->is_dvd) {
600 if (stream->align_iframe || s->packet_number == 0){
601 int PES_bytes_to_fill = s->packet_size - size - 10;
603 if (pts != AV_NOPTS_VALUE) {
605 PES_bytes_to_fill -= 5 + 5;
607 PES_bytes_to_fill -= 5;
610 if (stream->bytes_to_iframe == 0 || s->packet_number == 0) {
611 size = put_system_header(ctx, buf_ptr, 0);
613 size = buf_ptr - buffer;
614 avio_write(ctx->pb, buffer, size);
616 avio_wb32(ctx->pb, PRIVATE_STREAM_2);
617 avio_wb16(ctx->pb, 0x03d4); // length
618 avio_w8(ctx->pb, 0x00); // substream ID, 00=PCI
619 for (i = 0; i < 979; i++)
620 avio_w8(ctx->pb, 0x00);
622 avio_wb32(ctx->pb, PRIVATE_STREAM_2);
623 avio_wb16(ctx->pb, 0x03fa); // length
624 avio_w8(ctx->pb, 0x01); // substream ID, 01=DSI
625 for (i = 0; i < 1017; i++)
626 avio_w8(ctx->pb, 0x00);
628 memset(buffer, 0, 128);
631 stream->align_iframe = 0;
632 scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
633 size = put_pack_header(ctx, buf_ptr, scr);
637 } else if (stream->bytes_to_iframe < PES_bytes_to_fill) {
638 pad_packet_bytes = PES_bytes_to_fill - stream->bytes_to_iframe;
642 if ((s->packet_number % s->system_header_freq) == 0) {
643 size = put_system_header(ctx, buf_ptr, 0);
648 size = buf_ptr - buffer;
649 avio_write(ctx->pb, buffer, size);
651 packet_size = s->packet_size - size;
653 if (s->is_vcd && (id & 0xe0) == AUDIO_ID)
654 /* The VCD standard demands that 20 zero bytes follow
655 each audio pack (see standard p. IV-8).*/
656 zero_trail_bytes += 20;
658 if ((s->is_vcd && stream->packet_number==0)
659 || (s->is_svcd && s->packet_number==0)) {
660 /* for VCD the first pack of each stream contains only the pack header,
661 the system header and lots of padding (see VCD standard p. IV-6).
662 In the case of an audio pack, 20 zero bytes are also added at
664 /* For SVCD we fill the very first pack to increase compatibility with
665 some DVD players. Not mandated by the standard.*/
667 general_pack = 1; /* the system header refers to both streams and no stream data*/
668 pad_packet_bytes = packet_size - zero_trail_bytes;
671 packet_size -= pad_packet_bytes + zero_trail_bytes;
673 if (packet_size > 0) {
675 /* packet header size */
681 if (stream->packet_number==0)
682 header_len += 3; /* PES extension */
683 header_len += 1; /* obligatory stuffing byte */
687 if (pts != AV_NOPTS_VALUE) {
697 payload_size = packet_size - header_len;
699 startcode = PRIVATE_STREAM_1;
707 startcode = 0x100 + id;
710 stuffing_size = payload_size - av_fifo_size(stream->fifo);
712 // first byte does not fit -> reset pts/dts + stuffing
713 if(payload_size <= trailer_size && pts != AV_NOPTS_VALUE){
717 if(pts != AV_NOPTS_VALUE)
718 timestamp_len += s->is_mpeg2 ? 5 : 4;
719 pts=dts= AV_NOPTS_VALUE;
720 header_len -= timestamp_len;
721 if (s->is_dvd && stream->align_iframe) {
722 pad_packet_bytes += timestamp_len;
723 packet_size -= timestamp_len;
725 payload_size += timestamp_len;
727 stuffing_size += timestamp_len;
728 if(payload_size > trailer_size)
729 stuffing_size += payload_size - trailer_size;
732 if (pad_packet_bytes > 0 && pad_packet_bytes <= 7) { // can't use padding, so use stuffing
733 packet_size += pad_packet_bytes;
734 payload_size += pad_packet_bytes; // undo the previous adjustment
735 if (stuffing_size < 0) {
736 stuffing_size = pad_packet_bytes;
738 stuffing_size += pad_packet_bytes;
740 pad_packet_bytes = 0;
743 if (stuffing_size < 0)
746 if (startcode == PRIVATE_STREAM_1 && id >= 0xa0) {
747 if (payload_size < av_fifo_size(stream->fifo))
748 stuffing_size += payload_size % stream->lpcm_align;
751 if (stuffing_size > 16) { /*<=16 for MPEG-1, <=32 for MPEG-2*/
752 pad_packet_bytes += stuffing_size;
753 packet_size -= stuffing_size;
754 payload_size -= stuffing_size;
758 nb_frames= get_nb_frames(ctx, stream, payload_size - stuffing_size);
760 avio_wb32(ctx->pb, startcode);
762 avio_wb16(ctx->pb, packet_size);
765 for(i=0;i<stuffing_size;i++)
766 avio_w8(ctx->pb, 0xff);
769 avio_w8(ctx->pb, 0x80); /* mpeg2 id */
773 if (pts != AV_NOPTS_VALUE) {
779 /* Both the MPEG-2 and the SVCD standards demand that the
780 P-STD_buffer_size field be included in the first packet of
781 every stream. (see SVCD standard p. 26 V.2.3.1 and V.2.3.2
782 and MPEG-2 standard 2.7.7) */
783 if (stream->packet_number == 0)
786 avio_w8(ctx->pb, pes_flags); /* flags */
787 avio_w8(ctx->pb, header_len - 3 + stuffing_size);
789 if (pes_flags & 0x80) /*write pts*/
790 put_timestamp(ctx->pb, (pes_flags & 0x40) ? 0x03 : 0x02, pts);
791 if (pes_flags & 0x40) /*write dts*/
792 put_timestamp(ctx->pb, 0x01, dts);
794 if (pes_flags & 0x01) { /*write pes extension*/
795 avio_w8(ctx->pb, 0x10); /* flags */
797 /* P-STD buffer info */
798 if ((id & 0xe0) == AUDIO_ID)
799 avio_wb16(ctx->pb, 0x4000 | stream->max_buffer_size/ 128);
801 avio_wb16(ctx->pb, 0x6000 | stream->max_buffer_size/1024);
805 if (pts != AV_NOPTS_VALUE) {
807 put_timestamp(ctx->pb, 0x03, pts);
808 put_timestamp(ctx->pb, 0x01, dts);
810 put_timestamp(ctx->pb, 0x02, pts);
813 avio_w8(ctx->pb, 0x0f);
818 /* special stuffing byte that is always written
819 to prevent accidental generation of start codes. */
820 avio_w8(ctx->pb, 0xff);
822 for(i=0;i<stuffing_size;i++)
823 avio_w8(ctx->pb, 0xff);
826 if (startcode == PRIVATE_STREAM_1) {
827 avio_w8(ctx->pb, id);
829 /* LPCM (XXX: check nb_frames) */
831 avio_wb16(ctx->pb, 4); /* skip 3 header bytes */
832 avio_w8(ctx->pb, stream->lpcm_header[0]);
833 avio_w8(ctx->pb, stream->lpcm_header[1]);
834 avio_w8(ctx->pb, stream->lpcm_header[2]);
835 } else if (id >= 0x40) {
837 avio_w8(ctx->pb, nb_frames);
838 avio_wb16(ctx->pb, trailer_size+1);
843 assert(payload_size - stuffing_size <= av_fifo_size(stream->fifo));
844 av_fifo_generic_read(stream->fifo, ctx->pb, payload_size - stuffing_size, (void*)avio_write);
845 stream->bytes_to_iframe -= payload_size - stuffing_size;
851 if (pad_packet_bytes > 0)
852 put_padding_packet(ctx,ctx->pb, pad_packet_bytes);
854 for(i=0;i<zero_trail_bytes;i++)
855 avio_w8(ctx->pb, 0x00);
861 /* only increase the stream packet number if this pack actually contains
862 something that is specific to this stream! I.e. a dedicated header
865 stream->packet_number++;
867 return payload_size - stuffing_size;
870 static void put_vcd_padding_sector(AVFormatContext *ctx)
872 /* There are two ways to do this padding: writing a sector/pack
873 of 0 values, or writing an MPEG padding pack. Both seem to
874 work with most decoders, BUT the VCD standard only allows a 0-sector
875 (see standard p. IV-4, IV-5).
876 So a 0-sector it is...*/
878 MpegMuxContext *s = ctx->priv_data;
881 for(i=0;i<s->packet_size;i++)
884 s->vcd_padding_bytes_written += s->packet_size;
888 /* increasing the packet number is correct. The SCR of the following packs
889 is calculated from the packet_number and it has to include the padding
890 sector (it represents the sector index, not the MPEG pack index)
891 (see VCD standard p. IV-6)*/
895 static int remove_decoded_packets(AVFormatContext *ctx, int64_t scr){
896 // MpegMuxContext *s = ctx->priv_data;
899 for(i=0; i<ctx->nb_streams; i++){
900 AVStream *st = ctx->streams[i];
901 StreamInfo *stream = st->priv_data;
902 PacketDesc *pkt_desc;
904 while((pkt_desc= stream->predecode_packet)
905 && scr > pkt_desc->dts){ //FIXME > vs >=
906 if(stream->buffer_index < pkt_desc->size ||
907 stream->predecode_packet == stream->premux_packet){
908 av_log(ctx, AV_LOG_ERROR,
909 "buffer underflow i=%d bufi=%d size=%d\n",
910 i, stream->buffer_index, pkt_desc->size);
913 stream->buffer_index -= pkt_desc->size;
915 stream->predecode_packet= pkt_desc->next;
923 static int output_packet(AVFormatContext *ctx, int flush){
924 MpegMuxContext *s = ctx->priv_data;
927 int i, avail_space=0, es_size, trailer_size;
929 int best_score= INT_MIN;
930 int ignore_constraints=0;
931 int64_t scr= s->last_scr;
932 PacketDesc *timestamp_packet;
933 const int64_t max_delay= av_rescale(ctx->max_delay, 90000, AV_TIME_BASE);
936 for(i=0; i<ctx->nb_streams; i++){
937 AVStream *st = ctx->streams[i];
938 StreamInfo *stream = st->priv_data;
939 const int avail_data= av_fifo_size(stream->fifo);
940 const int space= stream->max_buffer_size - stream->buffer_index;
941 int rel_space= 1024LL*space / stream->max_buffer_size;
942 PacketDesc *next_pkt= stream->premux_packet;
944 /* for subtitle, a single PES packet must be generated,
945 so we flush after every single subtitle packet */
946 if(s->packet_size > avail_data && !flush
947 && st->codec->codec_type != AVMEDIA_TYPE_SUBTITLE)
951 assert(avail_data>0);
953 if(space < s->packet_size && !ignore_constraints)
956 if(next_pkt && next_pkt->dts - scr > max_delay)
959 if(rel_space > best_score){
960 best_score= rel_space;
967 int64_t best_dts= INT64_MAX;
969 for(i=0; i<ctx->nb_streams; i++){
970 AVStream *st = ctx->streams[i];
971 StreamInfo *stream = st->priv_data;
972 PacketDesc *pkt_desc= stream->predecode_packet;
973 if(pkt_desc && pkt_desc->dts < best_dts)
974 best_dts= pkt_desc->dts;
977 av_dlog(ctx, "bumping scr, scr:%f, dts:%f\n",
978 scr / 90000.0, best_dts / 90000.0);
979 if(best_dts == INT64_MAX)
982 if(scr >= best_dts+1 && !ignore_constraints){
983 av_log(ctx, AV_LOG_ERROR, "packet too large, ignoring buffer limits to mux it\n");
984 ignore_constraints= 1;
986 scr= FFMAX(best_dts+1, scr);
987 if(remove_decoded_packets(ctx, scr) < 0)
994 st = ctx->streams[best_i];
995 stream = st->priv_data;
997 assert(av_fifo_size(stream->fifo) > 0);
999 assert(avail_space >= s->packet_size || ignore_constraints);
1001 timestamp_packet= stream->premux_packet;
1002 if(timestamp_packet->unwritten_size == timestamp_packet->size){
1005 trailer_size= timestamp_packet->unwritten_size;
1006 timestamp_packet= timestamp_packet->next;
1009 if(timestamp_packet){
1010 av_dlog(ctx, "dts:%f pts:%f scr:%f stream:%d\n",
1011 timestamp_packet->dts / 90000.0,
1012 timestamp_packet->pts / 90000.0,
1013 scr / 90000.0, best_i);
1014 es_size= flush_packet(ctx, best_i, timestamp_packet->pts, timestamp_packet->dts, scr, trailer_size);
1016 assert(av_fifo_size(stream->fifo) == trailer_size);
1017 es_size= flush_packet(ctx, best_i, AV_NOPTS_VALUE, AV_NOPTS_VALUE, scr, trailer_size);
1021 /* Write one or more padding sectors, if necessary, to reach
1022 the constant overall bitrate.*/
1025 while((vcd_pad_bytes = get_vcd_padding_size(ctx,stream->premux_packet->pts) ) >= s->packet_size){ //FIXME pts cannot be correct here
1026 put_vcd_padding_sector(ctx);
1027 s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
1031 stream->buffer_index += es_size;
1032 s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
1034 while(stream->premux_packet && stream->premux_packet->unwritten_size <= es_size){
1035 es_size -= stream->premux_packet->unwritten_size;
1036 stream->premux_packet= stream->premux_packet->next;
1039 stream->premux_packet->unwritten_size -= es_size;
1041 if(remove_decoded_packets(ctx, s->last_scr) < 0)
1047 static int mpeg_mux_write_packet(AVFormatContext *ctx, AVPacket *pkt)
1049 MpegMuxContext *s = ctx->priv_data;
1050 int stream_index= pkt->stream_index;
1051 int size= pkt->size;
1052 uint8_t *buf= pkt->data;
1053 AVStream *st = ctx->streams[stream_index];
1054 StreamInfo *stream = st->priv_data;
1056 PacketDesc *pkt_desc;
1058 const int is_iframe = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && (pkt->flags & AV_PKT_FLAG_KEY);
1060 preload = av_rescale(s->preload, 90000, AV_TIME_BASE);
1065 if (s->last_scr == AV_NOPTS_VALUE) {
1066 if (dts == AV_NOPTS_VALUE || (dts < preload && ctx->avoid_negative_ts) || s->is_dvd) {
1067 if (dts != AV_NOPTS_VALUE)
1068 s->preload += av_rescale(-dts, AV_TIME_BASE, 90000);
1071 s->last_scr = dts - preload;
1074 preload = av_rescale(s->preload, 90000, AV_TIME_BASE);
1075 av_log(ctx, AV_LOG_DEBUG, "First SCR: %"PRId64" First DTS: %"PRId64"\n", s->last_scr, dts + preload);
1078 if (dts != AV_NOPTS_VALUE) dts += preload;
1079 if (pts != AV_NOPTS_VALUE) pts += preload;
1081 av_dlog(ctx, "dts:%f pts:%f flags:%d stream:%d nopts:%d\n",
1082 dts / 90000.0, pts / 90000.0, pkt->flags,
1083 pkt->stream_index, pts != AV_NOPTS_VALUE);
1084 if (!stream->premux_packet)
1085 stream->next_packet = &stream->premux_packet;
1086 *stream->next_packet=
1087 pkt_desc= av_mallocz(sizeof(PacketDesc));
1090 pkt_desc->unwritten_size=
1091 pkt_desc->size= size;
1092 if(!stream->predecode_packet)
1093 stream->predecode_packet= pkt_desc;
1094 stream->next_packet= &pkt_desc->next;
1096 if (av_fifo_realloc2(stream->fifo, av_fifo_size(stream->fifo) + size) < 0)
1100 if (is_iframe && (s->packet_number == 0 || (pts - stream->vobu_start_pts >= 36000))) { // min VOBU length 0.4 seconds (mpucoder)
1101 stream->bytes_to_iframe = av_fifo_size(stream->fifo);
1102 stream->align_iframe = 1;
1103 stream->vobu_start_pts = pts;
1107 av_fifo_generic_write(stream->fifo, buf, size, NULL);
1110 int ret= output_packet(ctx, 0);
1116 static int mpeg_mux_end(AVFormatContext *ctx)
1118 // MpegMuxContext *s = ctx->priv_data;
1123 int ret= output_packet(ctx, 1);
1130 /* End header according to MPEG1 systems standard. We do not write
1131 it as it is usually not needed by decoders and because it
1132 complicates MPEG stream concatenation. */
1133 //avio_wb32(ctx->pb, ISO_11172_END_CODE);
1134 //avio_flush(ctx->pb);
1136 for(i=0;i<ctx->nb_streams;i++) {
1137 stream = ctx->streams[i]->priv_data;
1139 assert(av_fifo_size(stream->fifo) == 0);
1140 av_fifo_free(stream->fifo);
1145 #define OFFSET(x) offsetof(MpegMuxContext, x)
1146 #define E AV_OPT_FLAG_ENCODING_PARAM
1147 static const AVOption options[] = {
1148 { "muxrate", NULL, OFFSET(user_mux_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1149 { "preload", "Initial demux-decode delay in microseconds.", OFFSET(preload), AV_OPT_TYPE_INT, {.i64 = 500000}, 0, INT_MAX, E},
1153 #define MPEGENC_CLASS(flavor)\
1154 static const AVClass flavor ## _class = {\
1155 .class_name = #flavor " muxer",\
1156 .item_name = av_default_item_name,\
1157 .version = LIBAVUTIL_VERSION_INT,\
1161 #if CONFIG_MPEG1SYSTEM_MUXER
1163 AVOutputFormat ff_mpeg1system_muxer = {
1165 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 Systems / MPEG program stream"),
1166 .mime_type = "video/mpeg",
1167 .extensions = "mpg,mpeg",
1168 .priv_data_size = sizeof(MpegMuxContext),
1169 .audio_codec = AV_CODEC_ID_MP2,
1170 .video_codec = AV_CODEC_ID_MPEG1VIDEO,
1171 .write_header = mpeg_mux_init,
1172 .write_packet = mpeg_mux_write_packet,
1173 .write_trailer = mpeg_mux_end,
1174 .priv_class = &mpeg_class,
1177 #if CONFIG_MPEG1VCD_MUXER
1179 AVOutputFormat ff_mpeg1vcd_muxer = {
1181 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 Systems / MPEG program stream (VCD)"),
1182 .mime_type = "video/mpeg",
1183 .priv_data_size = sizeof(MpegMuxContext),
1184 .audio_codec = AV_CODEC_ID_MP2,
1185 .video_codec = AV_CODEC_ID_MPEG1VIDEO,
1186 .write_header = mpeg_mux_init,
1187 .write_packet = mpeg_mux_write_packet,
1188 .write_trailer = mpeg_mux_end,
1189 .priv_class = &vcd_class,
1192 #if CONFIG_MPEG2VOB_MUXER
1194 AVOutputFormat ff_mpeg2vob_muxer = {
1196 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (VOB)"),
1197 .mime_type = "video/mpeg",
1198 .extensions = "vob",
1199 .priv_data_size = sizeof(MpegMuxContext),
1200 .audio_codec = AV_CODEC_ID_MP2,
1201 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1202 .write_header = mpeg_mux_init,
1203 .write_packet = mpeg_mux_write_packet,
1204 .write_trailer = mpeg_mux_end,
1205 .priv_class = &vob_class,
1209 /* Same as mpeg2vob_mux except that the pack size is 2324 */
1210 #if CONFIG_MPEG2SVCD_MUXER
1212 AVOutputFormat ff_mpeg2svcd_muxer = {
1214 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (SVCD)"),
1215 .mime_type = "video/mpeg",
1216 .extensions = "vob",
1217 .priv_data_size = sizeof(MpegMuxContext),
1218 .audio_codec = AV_CODEC_ID_MP2,
1219 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1220 .write_header = mpeg_mux_init,
1221 .write_packet = mpeg_mux_write_packet,
1222 .write_trailer = mpeg_mux_end,
1223 .priv_class = &svcd_class,
1227 /* Same as mpeg2vob_mux except the 'is_dvd' flag is set to produce NAV pkts */
1228 #if CONFIG_MPEG2DVD_MUXER
1230 AVOutputFormat ff_mpeg2dvd_muxer = {
1232 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (DVD VOB)"),
1233 .mime_type = "video/mpeg",
1234 .extensions = "dvd",
1235 .priv_data_size = sizeof(MpegMuxContext),
1236 .audio_codec = AV_CODEC_ID_MP2,
1237 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1238 .write_header = mpeg_mux_init,
1239 .write_packet = mpeg_mux_write_packet,
1240 .write_trailer = mpeg_mux_end,
1241 .priv_class = &dvd_class,