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/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 mux_rate; /* bitrate in units of 50 bytes/s */
77 int64_t last_scr; /* current system clock */
79 double vcd_padding_bitrate; //FIXME floats
80 int64_t vcd_padding_bytes_written;
85 extern AVOutputFormat ff_mpeg1vcd_muxer;
86 extern AVOutputFormat ff_mpeg2dvd_muxer;
87 extern AVOutputFormat ff_mpeg2svcd_muxer;
88 extern AVOutputFormat ff_mpeg2vob_muxer;
90 static int put_pack_header(AVFormatContext *ctx,
91 uint8_t *buf, int64_t timestamp)
93 MpegMuxContext *s = ctx->priv_data;
96 init_put_bits(&pb, buf, 128);
98 put_bits32(&pb, PACK_START_CODE);
100 put_bits(&pb, 2, 0x1);
102 put_bits(&pb, 4, 0x2);
104 put_bits(&pb, 3, (uint32_t)((timestamp >> 30) & 0x07));
106 put_bits(&pb, 15, (uint32_t)((timestamp >> 15) & 0x7fff));
108 put_bits(&pb, 15, (uint32_t)((timestamp ) & 0x7fff));
111 /* clock extension */
115 put_bits(&pb, 22, s->mux_rate);
119 put_bits(&pb, 5, 0x1f); /* reserved */
120 put_bits(&pb, 3, 0); /* stuffing length */
123 return put_bits_ptr(&pb) - pb.buf;
126 static int put_system_header(AVFormatContext *ctx, uint8_t *buf,int only_for_stream_id)
128 MpegMuxContext *s = ctx->priv_data;
129 int size, i, private_stream_coded, id;
132 init_put_bits(&pb, buf, 128);
134 put_bits32(&pb, SYSTEM_HEADER_START_CODE);
135 put_bits(&pb, 16, 0);
138 put_bits(&pb, 22, s->mux_rate); /* maximum bit rate of the multiplexed stream */
139 put_bits(&pb, 1, 1); /* marker */
140 if (s->is_vcd && only_for_stream_id==VIDEO_ID) {
141 /* This header applies only to the video stream (see VCD standard p. IV-7)*/
144 put_bits(&pb, 6, s->audio_bound);
147 /* see VCD standard, p. IV-7*/
151 put_bits(&pb, 1, 0); /* variable bitrate*/
152 put_bits(&pb, 1, 0); /* non constrainted bit stream */
155 if (s->is_vcd || s->is_dvd) {
156 /* see VCD standard p IV-7 */
157 put_bits(&pb, 1, 1); /* audio locked */
158 put_bits(&pb, 1, 1); /* video locked */
160 put_bits(&pb, 1, 0); /* audio locked */
161 put_bits(&pb, 1, 0); /* video locked */
164 put_bits(&pb, 1, 1); /* marker */
166 if (s->is_vcd && (only_for_stream_id & 0xe0) == AUDIO_ID) {
167 /* This header applies only to the audio stream (see VCD standard p. IV-7)*/
170 put_bits(&pb, 5, s->video_bound);
173 put_bits(&pb, 1, 0); /* packet_rate_restriction_flag */
174 put_bits(&pb, 7, 0x7f); /* reserved byte */
176 put_bits(&pb, 8, 0xff); /* reserved byte */
178 /* DVD-Video Stream_bound entries
179 id (0xB9) video, maximum P-STD for stream 0xE0. (P-STD_buffer_bound_scale = 1)
180 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)
181 id (0xBD) private stream 1 (audio other than MPEG and subpictures). (P-STD_buffer_bound_scale = 1)
182 id (0xBF) private stream 2, NAV packs, set to 2x1024. */
185 int P_STD_max_video = 0;
186 int P_STD_max_mpeg_audio = 0;
187 int P_STD_max_mpeg_PS1 = 0;
189 for(i=0;i<ctx->nb_streams;i++) {
190 StreamInfo *stream = ctx->streams[i]->priv_data;
193 if (id == 0xbd && stream->max_buffer_size > P_STD_max_mpeg_PS1) {
194 P_STD_max_mpeg_PS1 = stream->max_buffer_size;
195 } else if (id >= 0xc0 && id <= 0xc7 && stream->max_buffer_size > P_STD_max_mpeg_audio) {
196 P_STD_max_mpeg_audio = stream->max_buffer_size;
197 } else if (id == 0xe0 && stream->max_buffer_size > P_STD_max_video) {
198 P_STD_max_video = stream->max_buffer_size;
203 put_bits(&pb, 8, 0xb9); /* stream ID */
206 put_bits(&pb, 13, P_STD_max_video / 1024);
209 if (P_STD_max_mpeg_audio == 0)
210 P_STD_max_mpeg_audio = 4096;
211 put_bits(&pb, 8, 0xb8); /* stream ID */
214 put_bits(&pb, 13, P_STD_max_mpeg_audio / 128);
216 /* private stream 1 */
217 put_bits(&pb, 8, 0xbd); /* stream ID */
220 put_bits(&pb, 13, P_STD_max_mpeg_PS1 / 128);
222 /* private stream 2 */
223 put_bits(&pb, 8, 0xbf); /* stream ID */
226 put_bits(&pb, 13, 2);
229 /* audio stream info */
230 private_stream_coded = 0;
231 for(i=0;i<ctx->nb_streams;i++) {
232 StreamInfo *stream = ctx->streams[i]->priv_data;
235 /* For VCDs, only include the stream info for the stream
236 that the pack which contains this system belongs to.
237 (see VCD standard p. IV-7) */
238 if ( !s->is_vcd || stream->id==only_for_stream_id
239 || only_for_stream_id==0) {
243 /* special case for private streams (AC-3 uses that) */
244 if (private_stream_coded)
246 private_stream_coded = 1;
249 put_bits(&pb, 8, id); /* stream ID */
254 put_bits(&pb, 13, stream->max_buffer_size / 128);
258 put_bits(&pb, 13, stream->max_buffer_size / 1024);
265 size = put_bits_ptr(&pb) - pb.buf;
266 /* patch packet size */
267 buf[4] = (size - 6) >> 8;
268 buf[5] = (size - 6) & 0xff;
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 */
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
384 case AVMEDIA_TYPE_SUBTITLE:
385 stream->id = mps_id++;
386 stream->max_buffer_size = 16 * 1024;
391 stream->fifo= av_fifo_alloc(16);
398 for(i=0;i<ctx->nb_streams;i++) {
400 st = ctx->streams[i];
401 stream = (StreamInfo*) st->priv_data;
403 if(st->codec->rc_max_rate || stream->id==VIDEO_ID)
404 codec_rate= st->codec->rc_max_rate;
406 codec_rate= st->codec->bit_rate;
409 codec_rate= (1<<21)*8*50/ctx->nb_streams;
411 bitrate += codec_rate;
413 if ((stream->id & 0xe0) == AUDIO_ID)
414 audio_bitrate += codec_rate;
415 else if (stream->id==VIDEO_ID)
416 video_bitrate += codec_rate;
420 /* we increase slightly the bitrate to take into account the
421 headers. XXX: compute it exactly */
422 bitrate += bitrate / 20;
424 s->mux_rate = (bitrate + (8 * 50) - 1) / (8 * 50);
428 double overhead_rate;
430 /* The VCD standard mandates that the mux_rate field is 3528
431 (see standard p. IV-6).
432 The value is actually "wrong", i.e. if you calculate
433 it using the normal formula and the 75 sectors per second transfer
434 rate you get a different value because the real pack size is 2324,
435 not 2352. But the standard explicitly specifies that the mux_rate
436 field in the header must have this value.*/
437 // s->mux_rate=2352 * 75 / 50; /* = 3528*/
439 /* The VCD standard states that the muxed stream must be
440 exactly 75 packs / second (the data rate of a single speed cdrom).
441 Since the video bitrate (probably 1150000 bits/sec) will be below
442 the theoretical maximum we have to add some padding packets
443 to make up for the lower data rate.
444 (cf. VCD standard p. IV-6 )*/
446 /* Add the header overhead to the data rate.
447 2279 data bytes per audio pack, 2294 data bytes per video pack*/
448 overhead_rate = ((audio_bitrate / 8.0) / 2279) * (2324 - 2279);
449 overhead_rate += ((video_bitrate / 8.0) / 2294) * (2324 - 2294);
452 /* Add padding so that the full bitrate is 2324*75 bytes/sec */
453 s->vcd_padding_bitrate = 2324 * 75 * 8 - (bitrate + overhead_rate);
456 if (s->is_vcd || s->is_mpeg2)
458 s->pack_header_freq = 1;
460 /* every 2 seconds */
461 s->pack_header_freq = 2 * bitrate / s->packet_size / 8;
463 /* the above seems to make pack_header_freq zero sometimes */
464 if (s->pack_header_freq == 0)
465 s->pack_header_freq = 1;
468 /* every 200 packets. Need to look at the spec. */
469 s->system_header_freq = s->pack_header_freq * 40;
471 /* the standard mandates that there are only two system headers
472 in the whole file: one in the first packet of each stream.
473 (see standard p. IV-7 and IV-8) */
474 s->system_header_freq = 0x7fffffff;
476 s->system_header_freq = s->pack_header_freq * 5;
478 for(i=0;i<ctx->nb_streams;i++) {
479 stream = ctx->streams[i]->priv_data;
480 stream->packet_number = 0;
482 s->system_header_size = get_system_header_size(ctx);
486 for(i=0;i<ctx->nb_streams;i++) {
487 av_free(ctx->streams[i]->priv_data);
489 return AVERROR(ENOMEM);
492 static inline void put_timestamp(AVIOContext *pb, int id, int64_t timestamp)
496 (((timestamp >> 30) & 0x07) << 1) |
498 avio_wb16(pb, (uint16_t)((((timestamp >> 15) & 0x7fff) << 1) | 1));
499 avio_wb16(pb, (uint16_t)((((timestamp ) & 0x7fff) << 1) | 1));
503 /* return the number of padding bytes that should be inserted into
504 the multiplexed stream.*/
505 static int get_vcd_padding_size(AVFormatContext *ctx, int64_t pts)
507 MpegMuxContext *s = ctx->priv_data;
510 if (s->vcd_padding_bitrate > 0 && pts!=AV_NOPTS_VALUE)
512 int64_t full_pad_bytes;
514 full_pad_bytes = (int64_t)((s->vcd_padding_bitrate * (pts / 90000.0)) / 8.0); //FIXME this is wrong
515 pad_bytes = (int) (full_pad_bytes - s->vcd_padding_bytes_written);
518 /* might happen if we have already padded to a later timestamp. This
519 can occur if another stream has already advanced further.*/
527 /* Write an MPEG padding packet header. */
528 static void put_padding_packet(AVFormatContext *ctx, AVIOContext *pb,int packet_bytes)
530 MpegMuxContext *s = ctx->priv_data;
533 avio_wb32(pb, PADDING_STREAM);
534 avio_wb16(pb, packet_bytes - 6);
541 for(i=0;i<packet_bytes;i++)
545 static int get_nb_frames(AVFormatContext *ctx, StreamInfo *stream, int len){
547 PacketDesc *pkt_desc= stream->premux_packet;
550 if(pkt_desc->size == pkt_desc->unwritten_size)
552 len -= pkt_desc->unwritten_size;
553 pkt_desc= pkt_desc->next;
559 /* flush the packet on stream stream_index */
560 static int flush_packet(AVFormatContext *ctx, int stream_index,
561 int64_t pts, int64_t dts, int64_t scr, int trailer_size)
563 MpegMuxContext *s = ctx->priv_data;
564 StreamInfo *stream = ctx->streams[stream_index]->priv_data;
566 int size, payload_size, startcode, id, stuffing_size, i, header_len;
569 int zero_trail_bytes = 0;
570 int pad_packet_bytes = 0;
572 int general_pack = 0; /*"general" pack without data specific to one stream?*/
577 av_dlog(ctx, "packet ID=%2x PTS=%0.3f\n", id, pts / 90000.0);
581 if ((s->packet_number % s->pack_header_freq) == 0 || s->last_scr != scr) {
582 /* output pack and systems header if needed */
583 size = put_pack_header(ctx, buf_ptr, scr);
588 /* there is exactly one system header for each stream in a VCD MPEG,
589 One in the very first video packet and one in the very first
590 audio packet (see VCD standard p. IV-7 and IV-8).*/
592 if (stream->packet_number==0) {
593 size = put_system_header(ctx, buf_ptr, id);
596 } else if (s->is_dvd) {
597 if (stream->align_iframe || s->packet_number == 0){
598 int PES_bytes_to_fill = s->packet_size - size - 10;
600 if (pts != AV_NOPTS_VALUE) {
602 PES_bytes_to_fill -= 5 + 5;
604 PES_bytes_to_fill -= 5;
607 if (stream->bytes_to_iframe == 0 || s->packet_number == 0) {
608 size = put_system_header(ctx, buf_ptr, 0);
610 size = buf_ptr - buffer;
611 avio_write(ctx->pb, buffer, size);
613 avio_wb32(ctx->pb, PRIVATE_STREAM_2);
614 avio_wb16(ctx->pb, 0x03d4); // length
615 avio_w8(ctx->pb, 0x00); // substream ID, 00=PCI
616 for (i = 0; i < 979; i++)
617 avio_w8(ctx->pb, 0x00);
619 avio_wb32(ctx->pb, PRIVATE_STREAM_2);
620 avio_wb16(ctx->pb, 0x03fa); // length
621 avio_w8(ctx->pb, 0x01); // substream ID, 01=DSI
622 for (i = 0; i < 1017; i++)
623 avio_w8(ctx->pb, 0x00);
625 memset(buffer, 0, 128);
628 stream->align_iframe = 0;
629 scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
630 size = put_pack_header(ctx, buf_ptr, scr);
634 } else if (stream->bytes_to_iframe < PES_bytes_to_fill) {
635 pad_packet_bytes = PES_bytes_to_fill - stream->bytes_to_iframe;
639 if ((s->packet_number % s->system_header_freq) == 0) {
640 size = put_system_header(ctx, buf_ptr, 0);
645 size = buf_ptr - buffer;
646 avio_write(ctx->pb, buffer, size);
648 packet_size = s->packet_size - size;
650 if (s->is_vcd && (id & 0xe0) == AUDIO_ID)
651 /* The VCD standard demands that 20 zero bytes follow
652 each audio pack (see standard p. IV-8).*/
653 zero_trail_bytes += 20;
655 if ((s->is_vcd && stream->packet_number==0)
656 || (s->is_svcd && s->packet_number==0)) {
657 /* for VCD the first pack of each stream contains only the pack header,
658 the system header and lots of padding (see VCD standard p. IV-6).
659 In the case of an audio pack, 20 zero bytes are also added at
661 /* For SVCD we fill the very first pack to increase compatibility with
662 some DVD players. Not mandated by the standard.*/
664 general_pack = 1; /* the system header refers to both streams and no stream data*/
665 pad_packet_bytes = packet_size - zero_trail_bytes;
668 packet_size -= pad_packet_bytes + zero_trail_bytes;
670 if (packet_size > 0) {
672 /* packet header size */
678 if (stream->packet_number==0)
679 header_len += 3; /* PES extension */
680 header_len += 1; /* obligatory stuffing byte */
684 if (pts != AV_NOPTS_VALUE) {
694 payload_size = packet_size - header_len;
696 startcode = PRIVATE_STREAM_1;
704 startcode = 0x100 + id;
707 stuffing_size = payload_size - av_fifo_size(stream->fifo);
709 // first byte does not fit -> reset pts/dts + stuffing
710 if(payload_size <= trailer_size && pts != AV_NOPTS_VALUE){
714 if(pts != AV_NOPTS_VALUE)
715 timestamp_len += s->is_mpeg2 ? 5 : 4;
716 pts=dts= AV_NOPTS_VALUE;
717 header_len -= timestamp_len;
718 if (s->is_dvd && stream->align_iframe) {
719 pad_packet_bytes += timestamp_len;
720 packet_size -= timestamp_len;
722 payload_size += timestamp_len;
724 stuffing_size += timestamp_len;
725 if(payload_size > trailer_size)
726 stuffing_size += payload_size - trailer_size;
729 if (pad_packet_bytes > 0 && pad_packet_bytes <= 7) { // can't use padding, so use stuffing
730 packet_size += pad_packet_bytes;
731 payload_size += pad_packet_bytes; // undo the previous adjustment
732 if (stuffing_size < 0) {
733 stuffing_size = pad_packet_bytes;
735 stuffing_size += pad_packet_bytes;
737 pad_packet_bytes = 0;
740 if (stuffing_size < 0)
743 if (startcode == PRIVATE_STREAM_1 && id >= 0xa0) {
744 if (payload_size < av_fifo_size(stream->fifo))
745 stuffing_size += payload_size % stream->lpcm_align;
748 if (stuffing_size > 16) { /*<=16 for MPEG-1, <=32 for MPEG-2*/
749 pad_packet_bytes += stuffing_size;
750 packet_size -= stuffing_size;
751 payload_size -= stuffing_size;
755 nb_frames= get_nb_frames(ctx, stream, payload_size - stuffing_size);
757 avio_wb32(ctx->pb, startcode);
759 avio_wb16(ctx->pb, packet_size);
762 for(i=0;i<stuffing_size;i++)
763 avio_w8(ctx->pb, 0xff);
766 avio_w8(ctx->pb, 0x80); /* mpeg2 id */
770 if (pts != AV_NOPTS_VALUE) {
776 /* Both the MPEG-2 and the SVCD standards demand that the
777 P-STD_buffer_size field be included in the first packet of
778 every stream. (see SVCD standard p. 26 V.2.3.1 and V.2.3.2
779 and MPEG-2 standard 2.7.7) */
780 if (stream->packet_number == 0)
783 avio_w8(ctx->pb, pes_flags); /* flags */
784 avio_w8(ctx->pb, header_len - 3 + stuffing_size);
786 if (pes_flags & 0x80) /*write pts*/
787 put_timestamp(ctx->pb, (pes_flags & 0x40) ? 0x03 : 0x02, pts);
788 if (pes_flags & 0x40) /*write dts*/
789 put_timestamp(ctx->pb, 0x01, dts);
791 if (pes_flags & 0x01) { /*write pes extension*/
792 avio_w8(ctx->pb, 0x10); /* flags */
794 /* P-STD buffer info */
795 if ((id & 0xe0) == AUDIO_ID)
796 avio_wb16(ctx->pb, 0x4000 | stream->max_buffer_size/ 128);
798 avio_wb16(ctx->pb, 0x6000 | stream->max_buffer_size/1024);
802 if (pts != AV_NOPTS_VALUE) {
804 put_timestamp(ctx->pb, 0x03, pts);
805 put_timestamp(ctx->pb, 0x01, dts);
807 put_timestamp(ctx->pb, 0x02, pts);
810 avio_w8(ctx->pb, 0x0f);
815 /* special stuffing byte that is always written
816 to prevent accidental generation of start codes. */
817 avio_w8(ctx->pb, 0xff);
819 for(i=0;i<stuffing_size;i++)
820 avio_w8(ctx->pb, 0xff);
823 if (startcode == PRIVATE_STREAM_1) {
824 avio_w8(ctx->pb, id);
826 /* LPCM (XXX: check nb_frames) */
828 avio_wb16(ctx->pb, 4); /* skip 3 header bytes */
829 avio_w8(ctx->pb, stream->lpcm_header[0]);
830 avio_w8(ctx->pb, stream->lpcm_header[1]);
831 avio_w8(ctx->pb, stream->lpcm_header[2]);
832 } else if (id >= 0x40) {
834 avio_w8(ctx->pb, nb_frames);
835 avio_wb16(ctx->pb, trailer_size+1);
840 assert(payload_size - stuffing_size <= av_fifo_size(stream->fifo));
841 av_fifo_generic_read(stream->fifo, ctx->pb, payload_size - stuffing_size, &avio_write);
842 stream->bytes_to_iframe -= payload_size - stuffing_size;
848 if (pad_packet_bytes > 0)
849 put_padding_packet(ctx,ctx->pb, pad_packet_bytes);
851 for(i=0;i<zero_trail_bytes;i++)
852 avio_w8(ctx->pb, 0x00);
858 /* only increase the stream packet number if this pack actually contains
859 something that is specific to this stream! I.e. a dedicated header
862 stream->packet_number++;
864 return payload_size - stuffing_size;
867 static void put_vcd_padding_sector(AVFormatContext *ctx)
869 /* There are two ways to do this padding: writing a sector/pack
870 of 0 values, or writing an MPEG padding pack. Both seem to
871 work with most decoders, BUT the VCD standard only allows a 0-sector
872 (see standard p. IV-4, IV-5).
873 So a 0-sector it is...*/
875 MpegMuxContext *s = ctx->priv_data;
878 for(i=0;i<s->packet_size;i++)
881 s->vcd_padding_bytes_written += s->packet_size;
885 /* increasing the packet number is correct. The SCR of the following packs
886 is calculated from the packet_number and it has to include the padding
887 sector (it represents the sector index, not the MPEG pack index)
888 (see VCD standard p. IV-6)*/
892 static int remove_decoded_packets(AVFormatContext *ctx, int64_t scr){
893 // MpegMuxContext *s = ctx->priv_data;
896 for(i=0; i<ctx->nb_streams; i++){
897 AVStream *st = ctx->streams[i];
898 StreamInfo *stream = st->priv_data;
899 PacketDesc *pkt_desc;
901 while((pkt_desc= stream->predecode_packet)
902 && scr > pkt_desc->dts){ //FIXME > vs >=
903 if(stream->buffer_index < pkt_desc->size ||
904 stream->predecode_packet == stream->premux_packet){
905 av_log(ctx, AV_LOG_ERROR,
906 "buffer underflow i=%d bufi=%d size=%d\n",
907 i, stream->buffer_index, pkt_desc->size);
910 stream->buffer_index -= pkt_desc->size;
912 stream->predecode_packet= pkt_desc->next;
920 static int output_packet(AVFormatContext *ctx, int flush){
921 MpegMuxContext *s = ctx->priv_data;
924 int i, avail_space=0, es_size, trailer_size;
926 int best_score= INT_MIN;
927 int ignore_constraints=0;
928 int64_t scr= s->last_scr;
929 PacketDesc *timestamp_packet;
930 const int64_t max_delay= av_rescale(ctx->max_delay, 90000, AV_TIME_BASE);
933 for(i=0; i<ctx->nb_streams; i++){
934 AVStream *st = ctx->streams[i];
935 StreamInfo *stream = st->priv_data;
936 const int avail_data= av_fifo_size(stream->fifo);
937 const int space= stream->max_buffer_size - stream->buffer_index;
938 int rel_space= 1024*space / stream->max_buffer_size;
939 PacketDesc *next_pkt= stream->premux_packet;
941 /* for subtitle, a single PES packet must be generated,
942 so we flush after every single subtitle packet */
943 if(s->packet_size > avail_data && !flush
944 && st->codec->codec_type != AVMEDIA_TYPE_SUBTITLE)
948 assert(avail_data>0);
950 if(space < s->packet_size && !ignore_constraints)
953 if(next_pkt && next_pkt->dts - scr > max_delay)
956 if(rel_space > best_score){
957 best_score= rel_space;
964 int64_t best_dts= INT64_MAX;
966 for(i=0; i<ctx->nb_streams; i++){
967 AVStream *st = ctx->streams[i];
968 StreamInfo *stream = st->priv_data;
969 PacketDesc *pkt_desc= stream->predecode_packet;
970 if(pkt_desc && pkt_desc->dts < best_dts)
971 best_dts= pkt_desc->dts;
974 av_dlog(ctx, "bumping scr, scr:%f, dts:%f\n",
975 scr / 90000.0, best_dts / 90000.0);
976 if(best_dts == INT64_MAX)
979 if(scr >= best_dts+1 && !ignore_constraints){
980 av_log(ctx, AV_LOG_ERROR, "packet too large, ignoring buffer limits to mux it\n");
981 ignore_constraints= 1;
983 scr= FFMAX(best_dts+1, scr);
984 if(remove_decoded_packets(ctx, scr) < 0)
991 st = ctx->streams[best_i];
992 stream = st->priv_data;
994 assert(av_fifo_size(stream->fifo) > 0);
996 assert(avail_space >= s->packet_size || ignore_constraints);
998 timestamp_packet= stream->premux_packet;
999 if(timestamp_packet->unwritten_size == timestamp_packet->size){
1002 trailer_size= timestamp_packet->unwritten_size;
1003 timestamp_packet= timestamp_packet->next;
1006 if(timestamp_packet){
1007 av_dlog(ctx, "dts:%f pts:%f scr:%f stream:%d\n",
1008 timestamp_packet->dts / 90000.0,
1009 timestamp_packet->pts / 90000.0,
1010 scr / 90000.0, best_i);
1011 es_size= flush_packet(ctx, best_i, timestamp_packet->pts, timestamp_packet->dts, scr, trailer_size);
1013 assert(av_fifo_size(stream->fifo) == trailer_size);
1014 es_size= flush_packet(ctx, best_i, AV_NOPTS_VALUE, AV_NOPTS_VALUE, scr, trailer_size);
1018 /* Write one or more padding sectors, if necessary, to reach
1019 the constant overall bitrate.*/
1022 while((vcd_pad_bytes = get_vcd_padding_size(ctx,stream->premux_packet->pts) ) >= s->packet_size){ //FIXME pts cannot be correct here
1023 put_vcd_padding_sector(ctx);
1024 s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
1028 stream->buffer_index += es_size;
1029 s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
1031 while(stream->premux_packet && stream->premux_packet->unwritten_size <= es_size){
1032 es_size -= stream->premux_packet->unwritten_size;
1033 stream->premux_packet= stream->premux_packet->next;
1036 stream->premux_packet->unwritten_size -= es_size;
1038 if(remove_decoded_packets(ctx, s->last_scr) < 0)
1044 static int mpeg_mux_write_packet(AVFormatContext *ctx, AVPacket *pkt)
1046 MpegMuxContext *s = ctx->priv_data;
1047 int stream_index= pkt->stream_index;
1048 int size= pkt->size;
1049 uint8_t *buf= pkt->data;
1050 AVStream *st = ctx->streams[stream_index];
1051 StreamInfo *stream = st->priv_data;
1053 PacketDesc *pkt_desc;
1055 const int is_iframe = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && (pkt->flags & AV_PKT_FLAG_KEY);
1057 preload = av_rescale(s->preload, 90000, AV_TIME_BASE);
1062 if(pts != AV_NOPTS_VALUE) pts += 2*preload;
1063 if(dts != AV_NOPTS_VALUE){
1065 s->last_scr= dts + preload;
1069 av_dlog(ctx, "dts:%f pts:%f flags:%d stream:%d nopts:%d\n",
1070 dts / 90000.0, pts / 90000.0, pkt->flags,
1071 pkt->stream_index, pts != AV_NOPTS_VALUE);
1072 if (!stream->premux_packet)
1073 stream->next_packet = &stream->premux_packet;
1074 *stream->next_packet=
1075 pkt_desc= av_mallocz(sizeof(PacketDesc));
1078 pkt_desc->unwritten_size=
1079 pkt_desc->size= size;
1080 if(!stream->predecode_packet)
1081 stream->predecode_packet= pkt_desc;
1082 stream->next_packet= &pkt_desc->next;
1084 if (av_fifo_realloc2(stream->fifo, av_fifo_size(stream->fifo) + size) < 0)
1088 if (is_iframe && (s->packet_number == 0 || (pts - stream->vobu_start_pts >= 36000))) { // min VOBU length 0.4 seconds (mpucoder)
1089 stream->bytes_to_iframe = av_fifo_size(stream->fifo);
1090 stream->align_iframe = 1;
1091 stream->vobu_start_pts = pts;
1095 av_fifo_generic_write(stream->fifo, buf, size, NULL);
1098 int ret= output_packet(ctx, 0);
1104 static int mpeg_mux_end(AVFormatContext *ctx)
1106 // MpegMuxContext *s = ctx->priv_data;
1111 int ret= output_packet(ctx, 1);
1118 /* End header according to MPEG1 systems standard. We do not write
1119 it as it is usually not needed by decoders and because it
1120 complicates MPEG stream concatenation. */
1121 //avio_wb32(ctx->pb, ISO_11172_END_CODE);
1122 //avio_flush(ctx->pb);
1124 for(i=0;i<ctx->nb_streams;i++) {
1125 stream = ctx->streams[i]->priv_data;
1127 assert(av_fifo_size(stream->fifo) == 0);
1128 av_fifo_free(stream->fifo);
1133 #define OFFSET(x) offsetof(MpegMuxContext, x)
1134 #define E AV_OPT_FLAG_ENCODING_PARAM
1135 static const AVOption options[] = {
1136 { "muxrate", NULL, OFFSET(mux_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1137 { "preload", "Initial demux-decode delay in microseconds.", OFFSET(preload), AV_OPT_TYPE_INT, {.i64 = 500000}, 0, INT_MAX, E},
1141 #define MPEGENC_CLASS(flavor)\
1142 static const AVClass flavor ## _class = {\
1143 .class_name = #flavor " muxer",\
1144 .item_name = av_default_item_name,\
1145 .version = LIBAVUTIL_VERSION_INT,\
1149 #if CONFIG_MPEG1SYSTEM_MUXER
1151 AVOutputFormat ff_mpeg1system_muxer = {
1153 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 Systems / MPEG program stream"),
1154 .mime_type = "video/mpeg",
1155 .extensions = "mpg,mpeg",
1156 .priv_data_size = sizeof(MpegMuxContext),
1157 .audio_codec = AV_CODEC_ID_MP2,
1158 .video_codec = AV_CODEC_ID_MPEG1VIDEO,
1159 .write_header = mpeg_mux_init,
1160 .write_packet = mpeg_mux_write_packet,
1161 .write_trailer = mpeg_mux_end,
1162 .priv_class = &mpeg_class,
1165 #if CONFIG_MPEG1VCD_MUXER
1167 AVOutputFormat ff_mpeg1vcd_muxer = {
1169 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 Systems / MPEG program stream (VCD)"),
1170 .mime_type = "video/mpeg",
1171 .priv_data_size = sizeof(MpegMuxContext),
1172 .audio_codec = AV_CODEC_ID_MP2,
1173 .video_codec = AV_CODEC_ID_MPEG1VIDEO,
1174 .write_header = mpeg_mux_init,
1175 .write_packet = mpeg_mux_write_packet,
1176 .write_trailer = mpeg_mux_end,
1177 .priv_class = &vcd_class,
1180 #if CONFIG_MPEG2VOB_MUXER
1182 AVOutputFormat ff_mpeg2vob_muxer = {
1184 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (VOB)"),
1185 .mime_type = "video/mpeg",
1186 .extensions = "vob",
1187 .priv_data_size = sizeof(MpegMuxContext),
1188 .audio_codec = AV_CODEC_ID_MP2,
1189 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1190 .write_header = mpeg_mux_init,
1191 .write_packet = mpeg_mux_write_packet,
1192 .write_trailer = mpeg_mux_end,
1193 .priv_class = &vob_class,
1197 /* Same as mpeg2vob_mux except that the pack size is 2324 */
1198 #if CONFIG_MPEG2SVCD_MUXER
1200 AVOutputFormat ff_mpeg2svcd_muxer = {
1202 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (SVCD)"),
1203 .mime_type = "video/mpeg",
1204 .extensions = "vob",
1205 .priv_data_size = sizeof(MpegMuxContext),
1206 .audio_codec = AV_CODEC_ID_MP2,
1207 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1208 .write_header = mpeg_mux_init,
1209 .write_packet = mpeg_mux_write_packet,
1210 .write_trailer = mpeg_mux_end,
1211 .priv_class = &svcd_class,
1215 /* Same as mpeg2vob_mux except the 'is_dvd' flag is set to produce NAV pkts */
1216 #if CONFIG_MPEG2DVD_MUXER
1218 AVOutputFormat ff_mpeg2dvd_muxer = {
1220 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (DVD VOB)"),
1221 .mime_type = "video/mpeg",
1222 .extensions = "dvd",
1223 .priv_data_size = sizeof(MpegMuxContext),
1224 .audio_codec = AV_CODEC_ID_MP2,
1225 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1226 .write_header = mpeg_mux_init,
1227 .write_packet = mpeg_mux_write_packet,
1228 .write_trailer = mpeg_mux_end,
1229 .priv_class = &dvd_class,