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
22 #include "libavutil/fifo.h"
23 #include "libavutil/log.h"
24 #include "libavutil/mathematics.h"
25 #include "libavutil/opt.h"
26 #include "libavcodec/put_bits.h"
31 #define MAX_PAYLOAD_SIZE 4096
36 typedef struct PacketDesc {
42 struct PacketDesc *next;
48 int max_buffer_size; /* in bytes */
50 PacketDesc *predecode_packet;
51 PacketDesc *premux_packet;
52 PacketDesc **next_packet;
54 uint8_t lpcm_header[3];
58 int64_t vobu_start_pts;
63 int packet_size; /* required packet size */
65 int pack_header_freq; /* frequency (in packets^-1) at which we send pack headers */
66 int system_header_freq;
67 int system_header_size;
68 int mux_rate; /* bitrate in units of 50 bytes/s */
76 int64_t last_scr; /* current system clock */
78 double vcd_padding_bitrate; //FIXME floats
79 int64_t vcd_padding_bytes_written;
84 extern AVOutputFormat ff_mpeg1vcd_muxer;
85 extern AVOutputFormat ff_mpeg2dvd_muxer;
86 extern AVOutputFormat ff_mpeg2svcd_muxer;
87 extern AVOutputFormat ff_mpeg2vob_muxer;
89 static int put_pack_header(AVFormatContext *ctx,
90 uint8_t *buf, int64_t timestamp)
92 MpegMuxContext *s = ctx->priv_data;
95 init_put_bits(&pb, buf, 128);
97 put_bits32(&pb, PACK_START_CODE);
99 put_bits(&pb, 2, 0x1);
101 put_bits(&pb, 4, 0x2);
103 put_bits(&pb, 3, (uint32_t)((timestamp >> 30) & 0x07));
105 put_bits(&pb, 15, (uint32_t)((timestamp >> 15) & 0x7fff));
107 put_bits(&pb, 15, (uint32_t)((timestamp ) & 0x7fff));
110 /* clock extension */
114 put_bits(&pb, 22, s->mux_rate);
118 put_bits(&pb, 5, 0x1f); /* reserved */
119 put_bits(&pb, 3, 0); /* stuffing length */
122 return put_bits_ptr(&pb) - pb.buf;
125 static int put_system_header(AVFormatContext *ctx, uint8_t *buf,int only_for_stream_id)
127 MpegMuxContext *s = ctx->priv_data;
128 int size, i, private_stream_coded, id;
131 init_put_bits(&pb, buf, 128);
133 put_bits32(&pb, SYSTEM_HEADER_START_CODE);
134 put_bits(&pb, 16, 0);
137 put_bits(&pb, 22, s->mux_rate); /* maximum bit rate of the multiplexed stream */
138 put_bits(&pb, 1, 1); /* marker */
139 if (s->is_vcd && only_for_stream_id==VIDEO_ID) {
140 /* This header applies only to the video stream (see VCD standard p. IV-7)*/
143 put_bits(&pb, 6, s->audio_bound);
146 /* see VCD standard, p. IV-7*/
150 put_bits(&pb, 1, 0); /* variable bitrate*/
151 put_bits(&pb, 1, 0); /* non constrainted bit stream */
154 if (s->is_vcd || s->is_dvd) {
155 /* see VCD standard p IV-7 */
156 put_bits(&pb, 1, 1); /* audio locked */
157 put_bits(&pb, 1, 1); /* video locked */
159 put_bits(&pb, 1, 0); /* audio locked */
160 put_bits(&pb, 1, 0); /* video locked */
163 put_bits(&pb, 1, 1); /* marker */
165 if (s->is_vcd && (only_for_stream_id & 0xe0) == AUDIO_ID) {
166 /* This header applies only to the audio stream (see VCD standard p. IV-7)*/
169 put_bits(&pb, 5, s->video_bound);
172 put_bits(&pb, 1, 0); /* packet_rate_restriction_flag */
173 put_bits(&pb, 7, 0x7f); /* reserved byte */
175 put_bits(&pb, 8, 0xff); /* reserved byte */
177 /* DVD-Video Stream_bound entries
178 id (0xB9) video, maximum P-STD for stream 0xE0. (P-STD_buffer_bound_scale = 1)
179 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)
180 id (0xBD) private stream 1 (audio other than MPEG and subpictures). (P-STD_buffer_bound_scale = 1)
181 id (0xBF) private stream 2, NAV packs, set to 2x1024. */
184 int P_STD_max_video = 0;
185 int P_STD_max_mpeg_audio = 0;
186 int P_STD_max_mpeg_PS1 = 0;
188 for(i=0;i<ctx->nb_streams;i++) {
189 StreamInfo *stream = ctx->streams[i]->priv_data;
192 if (id == 0xbd && stream->max_buffer_size > P_STD_max_mpeg_PS1) {
193 P_STD_max_mpeg_PS1 = stream->max_buffer_size;
194 } else if (id >= 0xc0 && id <= 0xc7 && stream->max_buffer_size > P_STD_max_mpeg_audio) {
195 P_STD_max_mpeg_audio = stream->max_buffer_size;
196 } else if (id == 0xe0 && stream->max_buffer_size > P_STD_max_video) {
197 P_STD_max_video = stream->max_buffer_size;
202 put_bits(&pb, 8, 0xb9); /* stream ID */
205 put_bits(&pb, 13, P_STD_max_video / 1024);
208 if (P_STD_max_mpeg_audio == 0)
209 P_STD_max_mpeg_audio = 4096;
210 put_bits(&pb, 8, 0xb8); /* stream ID */
213 put_bits(&pb, 13, P_STD_max_mpeg_audio / 128);
215 /* private stream 1 */
216 put_bits(&pb, 8, 0xbd); /* stream ID */
219 put_bits(&pb, 13, P_STD_max_mpeg_PS1 / 128);
221 /* private stream 2 */
222 put_bits(&pb, 8, 0xbf); /* stream ID */
225 put_bits(&pb, 13, 2);
228 /* audio stream info */
229 private_stream_coded = 0;
230 for(i=0;i<ctx->nb_streams;i++) {
231 StreamInfo *stream = ctx->streams[i]->priv_data;
234 /* For VCDs, only include the stream info for the stream
235 that the pack which contains this system belongs to.
236 (see VCD standard p. IV-7) */
237 if ( !s->is_vcd || stream->id==only_for_stream_id
238 || only_for_stream_id==0) {
242 /* special case for private streams (AC-3 uses that) */
243 if (private_stream_coded)
245 private_stream_coded = 1;
248 put_bits(&pb, 8, id); /* stream ID */
253 put_bits(&pb, 13, stream->max_buffer_size / 128);
257 put_bits(&pb, 13, stream->max_buffer_size / 1024);
264 size = put_bits_ptr(&pb) - pb.buf;
265 /* patch packet size */
266 buf[4] = (size - 6) >> 8;
267 buf[5] = (size - 6) & 0xff;
272 static int get_system_header_size(AVFormatContext *ctx)
274 int buf_index, i, private_stream_coded;
276 MpegMuxContext *s = ctx->priv_data;
279 return 18; // DVD-Video system headers are 18 bytes fixed length.
282 private_stream_coded = 0;
283 for(i=0;i<ctx->nb_streams;i++) {
284 stream = ctx->streams[i]->priv_data;
285 if (stream->id < 0xc0) {
286 if (private_stream_coded)
288 private_stream_coded = 1;
295 static int mpeg_mux_init(AVFormatContext *ctx)
297 MpegMuxContext *s = ctx->priv_data;
298 int bitrate, i, mpa_id, mpv_id, mps_id, ac3_id, dts_id, lpcm_id, j;
304 s->packet_number = 0;
305 s->is_vcd = (CONFIG_MPEG1VCD_MUXER && ctx->oformat == &ff_mpeg1vcd_muxer);
306 s->is_svcd = (CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &ff_mpeg2svcd_muxer);
307 s->is_mpeg2 = ((CONFIG_MPEG2VOB_MUXER && ctx->oformat == &ff_mpeg2vob_muxer) ||
308 (CONFIG_MPEG2DVD_MUXER && ctx->oformat == &ff_mpeg2dvd_muxer) ||
309 (CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &ff_mpeg2svcd_muxer));
310 s->is_dvd = (CONFIG_MPEG2DVD_MUXER && ctx->oformat == &ff_mpeg2dvd_muxer);
312 if(ctx->packet_size) {
313 if (ctx->packet_size < 20 || ctx->packet_size > (1 << 23) + 10) {
314 av_log(ctx, AV_LOG_ERROR, "Invalid packet size %d\n",
318 s->packet_size = ctx->packet_size;
320 s->packet_size = 2048;
321 if (ctx->max_delay < 0) /* Not set by the caller */
324 s->vcd_padding_bytes_written = 0;
325 s->vcd_padding_bitrate=0;
335 for(i=0;i<ctx->nb_streams;i++) {
336 st = ctx->streams[i];
337 stream = av_mallocz(sizeof(StreamInfo));
340 st->priv_data = stream;
342 avpriv_set_pts_info(st, 64, 1, 90000);
344 switch(st->codec->codec_type) {
345 case AVMEDIA_TYPE_AUDIO:
346 if (st->codec->codec_id == AV_CODEC_ID_AC3) {
347 stream->id = ac3_id++;
348 } else if (st->codec->codec_id == AV_CODEC_ID_DTS) {
349 stream->id = dts_id++;
350 } else if (st->codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
351 stream->id = lpcm_id++;
352 for(j = 0; j < 4; j++) {
353 if (lpcm_freq_tab[j] == st->codec->sample_rate)
358 if (st->codec->channels > 8)
360 stream->lpcm_header[0] = 0x0c;
361 stream->lpcm_header[1] = (st->codec->channels - 1) | (j << 4);
362 stream->lpcm_header[2] = 0x80;
363 stream->lpcm_align = st->codec->channels * 2;
365 stream->id = mpa_id++;
368 /* This value HAS to be used for VCD (see VCD standard, p. IV-7).
369 Right now it is also used for everything else.*/
370 stream->max_buffer_size = 4 * 1024;
373 case AVMEDIA_TYPE_VIDEO:
374 stream->id = mpv_id++;
375 if (st->codec->rc_buffer_size)
376 stream->max_buffer_size = 6*1024 + st->codec->rc_buffer_size/8;
378 av_log(ctx, AV_LOG_WARNING, "VBV buffer size not set, muxing may fail\n");
379 stream->max_buffer_size = 230*1024; //FIXME this is probably too small as default
383 case AVMEDIA_TYPE_SUBTITLE:
384 stream->id = mps_id++;
385 stream->max_buffer_size = 16 * 1024;
390 stream->fifo= av_fifo_alloc(16);
397 for(i=0;i<ctx->nb_streams;i++) {
399 st = ctx->streams[i];
400 stream = (StreamInfo*) st->priv_data;
402 if(st->codec->rc_max_rate || stream->id==VIDEO_ID)
403 codec_rate= st->codec->rc_max_rate;
405 codec_rate= st->codec->bit_rate;
408 codec_rate= (1<<21)*8*50/ctx->nb_streams;
410 bitrate += codec_rate;
412 if ((stream->id & 0xe0) == AUDIO_ID)
413 audio_bitrate += codec_rate;
414 else if (stream->id==VIDEO_ID)
415 video_bitrate += codec_rate;
419 /* we increase slightly the bitrate to take into account the
420 headers. XXX: compute it exactly */
421 bitrate += bitrate / 20;
423 s->mux_rate = (bitrate + (8 * 50) - 1) / (8 * 50);
427 double overhead_rate;
429 /* The VCD standard mandates that the mux_rate field is 3528
430 (see standard p. IV-6).
431 The value is actually "wrong", i.e. if you calculate
432 it using the normal formula and the 75 sectors per second transfer
433 rate you get a different value because the real pack size is 2324,
434 not 2352. But the standard explicitly specifies that the mux_rate
435 field in the header must have this value.*/
436 // s->mux_rate=2352 * 75 / 50; /* = 3528*/
438 /* The VCD standard states that the muxed stream must be
439 exactly 75 packs / second (the data rate of a single speed cdrom).
440 Since the video bitrate (probably 1150000 bits/sec) will be below
441 the theoretical maximum we have to add some padding packets
442 to make up for the lower data rate.
443 (cf. VCD standard p. IV-6 )*/
445 /* Add the header overhead to the data rate.
446 2279 data bytes per audio pack, 2294 data bytes per video pack*/
447 overhead_rate = ((audio_bitrate / 8.0) / 2279) * (2324 - 2279);
448 overhead_rate += ((video_bitrate / 8.0) / 2294) * (2324 - 2294);
451 /* Add padding so that the full bitrate is 2324*75 bytes/sec */
452 s->vcd_padding_bitrate = 2324 * 75 * 8 - (bitrate + overhead_rate);
455 if (s->is_vcd || s->is_mpeg2)
457 s->pack_header_freq = 1;
459 /* every 2 seconds */
460 s->pack_header_freq = 2 * bitrate / s->packet_size / 8;
462 /* the above seems to make pack_header_freq zero sometimes */
463 if (s->pack_header_freq == 0)
464 s->pack_header_freq = 1;
467 /* every 200 packets. Need to look at the spec. */
468 s->system_header_freq = s->pack_header_freq * 40;
470 /* the standard mandates that there are only two system headers
471 in the whole file: one in the first packet of each stream.
472 (see standard p. IV-7 and IV-8) */
473 s->system_header_freq = 0x7fffffff;
475 s->system_header_freq = s->pack_header_freq * 5;
477 for(i=0;i<ctx->nb_streams;i++) {
478 stream = ctx->streams[i]->priv_data;
479 stream->packet_number = 0;
481 s->system_header_size = get_system_header_size(ctx);
485 for(i=0;i<ctx->nb_streams;i++) {
486 av_free(ctx->streams[i]->priv_data);
488 return AVERROR(ENOMEM);
491 static inline void put_timestamp(AVIOContext *pb, int id, int64_t timestamp)
495 (((timestamp >> 30) & 0x07) << 1) |
497 avio_wb16(pb, (uint16_t)((((timestamp >> 15) & 0x7fff) << 1) | 1));
498 avio_wb16(pb, (uint16_t)((((timestamp ) & 0x7fff) << 1) | 1));
502 /* return the number of padding bytes that should be inserted into
503 the multiplexed stream.*/
504 static int get_vcd_padding_size(AVFormatContext *ctx, int64_t pts)
506 MpegMuxContext *s = ctx->priv_data;
509 if (s->vcd_padding_bitrate > 0 && pts!=AV_NOPTS_VALUE)
511 int64_t full_pad_bytes;
513 full_pad_bytes = (int64_t)((s->vcd_padding_bitrate * (pts / 90000.0)) / 8.0); //FIXME this is wrong
514 pad_bytes = (int) (full_pad_bytes - s->vcd_padding_bytes_written);
517 /* might happen if we have already padded to a later timestamp. This
518 can occur if another stream has already advanced further.*/
526 /* Write an MPEG padding packet header. */
527 static void put_padding_packet(AVFormatContext *ctx, AVIOContext *pb,int packet_bytes)
529 MpegMuxContext *s = ctx->priv_data;
532 avio_wb32(pb, PADDING_STREAM);
533 avio_wb16(pb, packet_bytes - 6);
540 for(i=0;i<packet_bytes;i++)
544 static int get_nb_frames(AVFormatContext *ctx, StreamInfo *stream, int len){
546 PacketDesc *pkt_desc= stream->premux_packet;
549 if(pkt_desc->size == pkt_desc->unwritten_size)
551 len -= pkt_desc->unwritten_size;
552 pkt_desc= pkt_desc->next;
558 /* flush the packet on stream stream_index */
559 static int flush_packet(AVFormatContext *ctx, int stream_index,
560 int64_t pts, int64_t dts, int64_t scr, int trailer_size)
562 MpegMuxContext *s = ctx->priv_data;
563 StreamInfo *stream = ctx->streams[stream_index]->priv_data;
565 int size, payload_size, startcode, id, stuffing_size, i, header_len;
568 int zero_trail_bytes = 0;
569 int pad_packet_bytes = 0;
571 int general_pack = 0; /*"general" pack without data specific to one stream?*/
576 av_dlog(ctx, "packet ID=%2x PTS=%0.3f\n", id, pts / 90000.0);
580 if ((s->packet_number % s->pack_header_freq) == 0 || s->last_scr != scr) {
581 /* output pack and systems header if needed */
582 size = put_pack_header(ctx, buf_ptr, scr);
587 /* there is exactly one system header for each stream in a VCD MPEG,
588 One in the very first video packet and one in the very first
589 audio packet (see VCD standard p. IV-7 and IV-8).*/
591 if (stream->packet_number==0) {
592 size = put_system_header(ctx, buf_ptr, id);
595 } else if (s->is_dvd) {
596 if (stream->align_iframe || s->packet_number == 0){
597 int PES_bytes_to_fill = s->packet_size - size - 10;
599 if (pts != AV_NOPTS_VALUE) {
601 PES_bytes_to_fill -= 5 + 5;
603 PES_bytes_to_fill -= 5;
606 if (stream->bytes_to_iframe == 0 || s->packet_number == 0) {
607 size = put_system_header(ctx, buf_ptr, 0);
609 size = buf_ptr - buffer;
610 avio_write(ctx->pb, buffer, size);
612 avio_wb32(ctx->pb, PRIVATE_STREAM_2);
613 avio_wb16(ctx->pb, 0x03d4); // length
614 avio_w8(ctx->pb, 0x00); // substream ID, 00=PCI
615 for (i = 0; i < 979; i++)
616 avio_w8(ctx->pb, 0x00);
618 avio_wb32(ctx->pb, PRIVATE_STREAM_2);
619 avio_wb16(ctx->pb, 0x03fa); // length
620 avio_w8(ctx->pb, 0x01); // substream ID, 01=DSI
621 for (i = 0; i < 1017; i++)
622 avio_w8(ctx->pb, 0x00);
624 memset(buffer, 0, 128);
627 stream->align_iframe = 0;
628 scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
629 size = put_pack_header(ctx, buf_ptr, scr);
633 } else if (stream->bytes_to_iframe < PES_bytes_to_fill) {
634 pad_packet_bytes = PES_bytes_to_fill - stream->bytes_to_iframe;
638 if ((s->packet_number % s->system_header_freq) == 0) {
639 size = put_system_header(ctx, buf_ptr, 0);
644 size = buf_ptr - buffer;
645 avio_write(ctx->pb, buffer, size);
647 packet_size = s->packet_size - size;
649 if (s->is_vcd && (id & 0xe0) == AUDIO_ID)
650 /* The VCD standard demands that 20 zero bytes follow
651 each audio pack (see standard p. IV-8).*/
652 zero_trail_bytes += 20;
654 if ((s->is_vcd && stream->packet_number==0)
655 || (s->is_svcd && s->packet_number==0)) {
656 /* for VCD the first pack of each stream contains only the pack header,
657 the system header and lots of padding (see VCD standard p. IV-6).
658 In the case of an audio pack, 20 zero bytes are also added at
660 /* For SVCD we fill the very first pack to increase compatibility with
661 some DVD players. Not mandated by the standard.*/
663 general_pack = 1; /* the system header refers to both streams and no stream data*/
664 pad_packet_bytes = packet_size - zero_trail_bytes;
667 packet_size -= pad_packet_bytes + zero_trail_bytes;
669 if (packet_size > 0) {
671 /* packet header size */
677 if (stream->packet_number==0)
678 header_len += 3; /* PES extension */
679 header_len += 1; /* obligatory stuffing byte */
683 if (pts != AV_NOPTS_VALUE) {
693 payload_size = packet_size - header_len;
695 startcode = PRIVATE_STREAM_1;
703 startcode = 0x100 + id;
706 stuffing_size = payload_size - av_fifo_size(stream->fifo);
708 // first byte does not fit -> reset pts/dts + stuffing
709 if(payload_size <= trailer_size && pts != AV_NOPTS_VALUE){
713 if(pts != AV_NOPTS_VALUE)
714 timestamp_len += s->is_mpeg2 ? 5 : 4;
715 pts=dts= AV_NOPTS_VALUE;
716 header_len -= timestamp_len;
717 if (s->is_dvd && stream->align_iframe) {
718 pad_packet_bytes += timestamp_len;
719 packet_size -= timestamp_len;
721 payload_size += timestamp_len;
723 stuffing_size += timestamp_len;
724 if(payload_size > trailer_size)
725 stuffing_size += payload_size - trailer_size;
728 if (pad_packet_bytes > 0 && pad_packet_bytes <= 7) { // can't use padding, so use stuffing
729 packet_size += pad_packet_bytes;
730 payload_size += pad_packet_bytes; // undo the previous adjustment
731 if (stuffing_size < 0) {
732 stuffing_size = pad_packet_bytes;
734 stuffing_size += pad_packet_bytes;
736 pad_packet_bytes = 0;
739 if (stuffing_size < 0)
742 if (startcode == PRIVATE_STREAM_1 && id >= 0xa0) {
743 if (payload_size < av_fifo_size(stream->fifo))
744 stuffing_size += payload_size % stream->lpcm_align;
747 if (stuffing_size > 16) { /*<=16 for MPEG-1, <=32 for MPEG-2*/
748 pad_packet_bytes += stuffing_size;
749 packet_size -= stuffing_size;
750 payload_size -= stuffing_size;
754 nb_frames= get_nb_frames(ctx, stream, payload_size - stuffing_size);
756 avio_wb32(ctx->pb, startcode);
758 avio_wb16(ctx->pb, packet_size);
761 for(i=0;i<stuffing_size;i++)
762 avio_w8(ctx->pb, 0xff);
765 avio_w8(ctx->pb, 0x80); /* mpeg2 id */
769 if (pts != AV_NOPTS_VALUE) {
775 /* Both the MPEG-2 and the SVCD standards demand that the
776 P-STD_buffer_size field be included in the first packet of
777 every stream. (see SVCD standard p. 26 V.2.3.1 and V.2.3.2
778 and MPEG-2 standard 2.7.7) */
779 if (stream->packet_number == 0)
782 avio_w8(ctx->pb, pes_flags); /* flags */
783 avio_w8(ctx->pb, header_len - 3 + stuffing_size);
785 if (pes_flags & 0x80) /*write pts*/
786 put_timestamp(ctx->pb, (pes_flags & 0x40) ? 0x03 : 0x02, pts);
787 if (pes_flags & 0x40) /*write dts*/
788 put_timestamp(ctx->pb, 0x01, dts);
790 if (pes_flags & 0x01) { /*write pes extension*/
791 avio_w8(ctx->pb, 0x10); /* flags */
793 /* P-STD buffer info */
794 if ((id & 0xe0) == AUDIO_ID)
795 avio_wb16(ctx->pb, 0x4000 | stream->max_buffer_size/ 128);
797 avio_wb16(ctx->pb, 0x6000 | stream->max_buffer_size/1024);
801 if (pts != AV_NOPTS_VALUE) {
803 put_timestamp(ctx->pb, 0x03, pts);
804 put_timestamp(ctx->pb, 0x01, dts);
806 put_timestamp(ctx->pb, 0x02, pts);
809 avio_w8(ctx->pb, 0x0f);
814 /* special stuffing byte that is always written
815 to prevent accidental generation of start codes. */
816 avio_w8(ctx->pb, 0xff);
818 for(i=0;i<stuffing_size;i++)
819 avio_w8(ctx->pb, 0xff);
822 if (startcode == PRIVATE_STREAM_1) {
823 avio_w8(ctx->pb, id);
825 /* LPCM (XXX: check nb_frames) */
827 avio_wb16(ctx->pb, 4); /* skip 3 header bytes */
828 avio_w8(ctx->pb, stream->lpcm_header[0]);
829 avio_w8(ctx->pb, stream->lpcm_header[1]);
830 avio_w8(ctx->pb, stream->lpcm_header[2]);
831 } else if (id >= 0x40) {
833 avio_w8(ctx->pb, nb_frames);
834 avio_wb16(ctx->pb, trailer_size+1);
839 assert(payload_size - stuffing_size <= av_fifo_size(stream->fifo));
840 av_fifo_generic_read(stream->fifo, ctx->pb, payload_size - stuffing_size, &avio_write);
841 stream->bytes_to_iframe -= payload_size - stuffing_size;
847 if (pad_packet_bytes > 0)
848 put_padding_packet(ctx,ctx->pb, pad_packet_bytes);
850 for(i=0;i<zero_trail_bytes;i++)
851 avio_w8(ctx->pb, 0x00);
857 /* only increase the stream packet number if this pack actually contains
858 something that is specific to this stream! I.e. a dedicated header
861 stream->packet_number++;
863 return payload_size - stuffing_size;
866 static void put_vcd_padding_sector(AVFormatContext *ctx)
868 /* There are two ways to do this padding: writing a sector/pack
869 of 0 values, or writing an MPEG padding pack. Both seem to
870 work with most decoders, BUT the VCD standard only allows a 0-sector
871 (see standard p. IV-4, IV-5).
872 So a 0-sector it is...*/
874 MpegMuxContext *s = ctx->priv_data;
877 for(i=0;i<s->packet_size;i++)
880 s->vcd_padding_bytes_written += s->packet_size;
884 /* increasing the packet number is correct. The SCR of the following packs
885 is calculated from the packet_number and it has to include the padding
886 sector (it represents the sector index, not the MPEG pack index)
887 (see VCD standard p. IV-6)*/
891 static int remove_decoded_packets(AVFormatContext *ctx, int64_t scr){
892 // MpegMuxContext *s = ctx->priv_data;
895 for(i=0; i<ctx->nb_streams; i++){
896 AVStream *st = ctx->streams[i];
897 StreamInfo *stream = st->priv_data;
898 PacketDesc *pkt_desc;
900 while((pkt_desc= stream->predecode_packet)
901 && scr > pkt_desc->dts){ //FIXME > vs >=
902 if(stream->buffer_index < pkt_desc->size ||
903 stream->predecode_packet == stream->premux_packet){
904 av_log(ctx, AV_LOG_ERROR,
905 "buffer underflow i=%d bufi=%d size=%d\n",
906 i, stream->buffer_index, pkt_desc->size);
909 stream->buffer_index -= pkt_desc->size;
911 stream->predecode_packet= pkt_desc->next;
919 static int output_packet(AVFormatContext *ctx, int flush){
920 MpegMuxContext *s = ctx->priv_data;
923 int i, avail_space=0, es_size, trailer_size;
925 int best_score= INT_MIN;
926 int ignore_constraints=0;
927 int64_t scr= s->last_scr;
928 PacketDesc *timestamp_packet;
929 const int64_t max_delay= av_rescale(ctx->max_delay, 90000, AV_TIME_BASE);
932 for(i=0; i<ctx->nb_streams; i++){
933 AVStream *st = ctx->streams[i];
934 StreamInfo *stream = st->priv_data;
935 const int avail_data= av_fifo_size(stream->fifo);
936 const int space= stream->max_buffer_size - stream->buffer_index;
937 int rel_space= 1024*space / stream->max_buffer_size;
938 PacketDesc *next_pkt= stream->premux_packet;
940 /* for subtitle, a single PES packet must be generated,
941 so we flush after every single subtitle packet */
942 if(s->packet_size > avail_data && !flush
943 && st->codec->codec_type != AVMEDIA_TYPE_SUBTITLE)
947 assert(avail_data>0);
949 if(space < s->packet_size && !ignore_constraints)
952 if(next_pkt && next_pkt->dts - scr > max_delay)
955 if(rel_space > best_score){
956 best_score= rel_space;
963 int64_t best_dts= INT64_MAX;
965 for(i=0; i<ctx->nb_streams; i++){
966 AVStream *st = ctx->streams[i];
967 StreamInfo *stream = st->priv_data;
968 PacketDesc *pkt_desc= stream->predecode_packet;
969 if(pkt_desc && pkt_desc->dts < best_dts)
970 best_dts= pkt_desc->dts;
973 av_dlog(ctx, "bumping scr, scr:%f, dts:%f\n",
974 scr / 90000.0, best_dts / 90000.0);
975 if(best_dts == INT64_MAX)
978 if(scr >= best_dts+1 && !ignore_constraints){
979 av_log(ctx, AV_LOG_ERROR, "packet too large, ignoring buffer limits to mux it\n");
980 ignore_constraints= 1;
982 scr= FFMAX(best_dts+1, scr);
983 if(remove_decoded_packets(ctx, scr) < 0)
990 st = ctx->streams[best_i];
991 stream = st->priv_data;
993 assert(av_fifo_size(stream->fifo) > 0);
995 assert(avail_space >= s->packet_size || ignore_constraints);
997 timestamp_packet= stream->premux_packet;
998 if(timestamp_packet->unwritten_size == timestamp_packet->size){
1001 trailer_size= timestamp_packet->unwritten_size;
1002 timestamp_packet= timestamp_packet->next;
1005 if(timestamp_packet){
1006 //av_log(ctx, AV_LOG_DEBUG, "dts:%f pts:%f scr:%f stream:%d\n", timestamp_packet->dts/90000.0, timestamp_packet->pts/90000.0, scr/90000.0, best_i);
1007 es_size= flush_packet(ctx, best_i, timestamp_packet->pts, timestamp_packet->dts, scr, trailer_size);
1009 assert(av_fifo_size(stream->fifo) == trailer_size);
1010 es_size= flush_packet(ctx, best_i, AV_NOPTS_VALUE, AV_NOPTS_VALUE, scr, trailer_size);
1014 /* Write one or more padding sectors, if necessary, to reach
1015 the constant overall bitrate.*/
1018 while((vcd_pad_bytes = get_vcd_padding_size(ctx,stream->premux_packet->pts) ) >= s->packet_size){ //FIXME pts cannot be correct here
1019 put_vcd_padding_sector(ctx);
1020 s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
1024 stream->buffer_index += es_size;
1025 s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
1027 while(stream->premux_packet && stream->premux_packet->unwritten_size <= es_size){
1028 es_size -= stream->premux_packet->unwritten_size;
1029 stream->premux_packet= stream->premux_packet->next;
1032 stream->premux_packet->unwritten_size -= es_size;
1034 if(remove_decoded_packets(ctx, s->last_scr) < 0)
1040 static int mpeg_mux_write_packet(AVFormatContext *ctx, AVPacket *pkt)
1042 MpegMuxContext *s = ctx->priv_data;
1043 int stream_index= pkt->stream_index;
1044 int size= pkt->size;
1045 uint8_t *buf= pkt->data;
1046 AVStream *st = ctx->streams[stream_index];
1047 StreamInfo *stream = st->priv_data;
1049 PacketDesc *pkt_desc;
1051 const int is_iframe = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && (pkt->flags & AV_PKT_FLAG_KEY);
1053 preload = av_rescale(s->preload, 90000, AV_TIME_BASE);
1058 if(pts != AV_NOPTS_VALUE) pts += 2*preload;
1059 if(dts != AV_NOPTS_VALUE){
1061 s->last_scr= dts + preload;
1065 //av_log(ctx, AV_LOG_DEBUG, "dts:%f pts:%f flags:%d stream:%d nopts:%d\n", dts/90000.0, pts/90000.0, pkt->flags, pkt->stream_index, pts != AV_NOPTS_VALUE);
1066 if (!stream->premux_packet)
1067 stream->next_packet = &stream->premux_packet;
1068 *stream->next_packet=
1069 pkt_desc= av_mallocz(sizeof(PacketDesc));
1072 pkt_desc->unwritten_size=
1073 pkt_desc->size= size;
1074 if(!stream->predecode_packet)
1075 stream->predecode_packet= pkt_desc;
1076 stream->next_packet= &pkt_desc->next;
1078 if (av_fifo_realloc2(stream->fifo, av_fifo_size(stream->fifo) + size) < 0)
1082 if (is_iframe && (s->packet_number == 0 || (pts - stream->vobu_start_pts >= 36000))) { // min VOBU length 0.4 seconds (mpucoder)
1083 stream->bytes_to_iframe = av_fifo_size(stream->fifo);
1084 stream->align_iframe = 1;
1085 stream->vobu_start_pts = pts;
1089 av_fifo_generic_write(stream->fifo, buf, size, NULL);
1092 int ret= output_packet(ctx, 0);
1098 static int mpeg_mux_end(AVFormatContext *ctx)
1100 // MpegMuxContext *s = ctx->priv_data;
1105 int ret= output_packet(ctx, 1);
1112 /* End header according to MPEG1 systems standard. We do not write
1113 it as it is usually not needed by decoders and because it
1114 complicates MPEG stream concatenation. */
1115 //avio_wb32(ctx->pb, ISO_11172_END_CODE);
1116 //avio_flush(ctx->pb);
1118 for(i=0;i<ctx->nb_streams;i++) {
1119 stream = ctx->streams[i]->priv_data;
1121 assert(av_fifo_size(stream->fifo) == 0);
1122 av_fifo_free(stream->fifo);
1127 #define OFFSET(x) offsetof(MpegMuxContext, x)
1128 #define E AV_OPT_FLAG_ENCODING_PARAM
1129 static const AVOption options[] = {
1130 { "muxrate", NULL, OFFSET(mux_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1131 { "preload", "Initial demux-decode delay in microseconds.", OFFSET(preload), AV_OPT_TYPE_INT, {.i64 = 500000}, 0, INT_MAX, E},
1135 #define MPEGENC_CLASS(flavor)\
1136 static const AVClass flavor ## _class = {\
1137 .class_name = #flavor " muxer",\
1138 .item_name = av_default_item_name,\
1139 .version = LIBAVUTIL_VERSION_INT,\
1143 #if CONFIG_MPEG1SYSTEM_MUXER
1145 AVOutputFormat ff_mpeg1system_muxer = {
1147 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 Systems / MPEG program stream"),
1148 .mime_type = "video/mpeg",
1149 .extensions = "mpg,mpeg",
1150 .priv_data_size = sizeof(MpegMuxContext),
1151 .audio_codec = AV_CODEC_ID_MP2,
1152 .video_codec = AV_CODEC_ID_MPEG1VIDEO,
1153 .write_header = mpeg_mux_init,
1154 .write_packet = mpeg_mux_write_packet,
1155 .write_trailer = mpeg_mux_end,
1156 .priv_class = &mpeg_class,
1159 #if CONFIG_MPEG1VCD_MUXER
1161 AVOutputFormat ff_mpeg1vcd_muxer = {
1163 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 Systems / MPEG program stream (VCD)"),
1164 .mime_type = "video/mpeg",
1165 .priv_data_size = sizeof(MpegMuxContext),
1166 .audio_codec = AV_CODEC_ID_MP2,
1167 .video_codec = AV_CODEC_ID_MPEG1VIDEO,
1168 .write_header = mpeg_mux_init,
1169 .write_packet = mpeg_mux_write_packet,
1170 .write_trailer = mpeg_mux_end,
1171 .priv_class = &vcd_class,
1174 #if CONFIG_MPEG2VOB_MUXER
1176 AVOutputFormat ff_mpeg2vob_muxer = {
1178 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (VOB)"),
1179 .mime_type = "video/mpeg",
1180 .extensions = "vob",
1181 .priv_data_size = sizeof(MpegMuxContext),
1182 .audio_codec = AV_CODEC_ID_MP2,
1183 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1184 .write_header = mpeg_mux_init,
1185 .write_packet = mpeg_mux_write_packet,
1186 .write_trailer = mpeg_mux_end,
1187 .priv_class = &vob_class,
1191 /* Same as mpeg2vob_mux except that the pack size is 2324 */
1192 #if CONFIG_MPEG2SVCD_MUXER
1194 AVOutputFormat ff_mpeg2svcd_muxer = {
1196 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (SVCD)"),
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 = &svcd_class,
1209 /* Same as mpeg2vob_mux except the 'is_dvd' flag is set to produce NAV pkts */
1210 #if CONFIG_MPEG2DVD_MUXER
1212 AVOutputFormat ff_mpeg2dvd_muxer = {
1214 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (DVD VOB)"),
1215 .mime_type = "video/mpeg",
1216 .extensions = "dvd",
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 = &dvd_class,