2 * muxing functions for use within Libav
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
23 #include "avio_internal.h"
25 #include "libavcodec/internal.h"
26 #include "libavcodec/bytestream.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/dict.h"
29 #include "libavutil/pixdesc.h"
32 #include "libavutil/avassert.h"
33 #include "libavutil/avstring.h"
34 #include "libavutil/internal.h"
35 #include "libavutil/mathematics.h"
36 #include "libavutil/parseutils.h"
37 #include "libavutil/time.h"
39 #include "audiointerleave.h"
51 * muxing functions for use within Libav
54 /* fraction handling */
57 * f = val + (num / den) + 0.5.
59 * 'num' is normalized so that it is such as 0 <= num < den.
61 * @param f fractional number
62 * @param val integer value
63 * @param num must be >= 0
64 * @param den must be >= 1
66 static void frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den)
79 * Fractional addition to f: f = f + (incr / f->den).
81 * @param f fractional number
82 * @param incr increment, can be positive or negative
84 static void frac_add(AVFrac *f, int64_t incr)
97 } else if (num >= den) {
104 static int validate_codec_tag(AVFormatContext *s, AVStream *st)
106 const AVCodecTag *avctag;
108 enum AVCodecID id = AV_CODEC_ID_NONE;
109 unsigned int tag = 0;
112 * Check that tag + id is in the table
113 * If neither is in the table -> OK
114 * If tag is in the table with another id -> FAIL
115 * If id is in the table with another tag -> FAIL unless strict < normal
117 for (n = 0; s->oformat->codec_tag[n]; n++) {
118 avctag = s->oformat->codec_tag[n];
119 while (avctag->id != AV_CODEC_ID_NONE) {
120 if (avpriv_toupper4(avctag->tag) == avpriv_toupper4(st->codec->codec_tag)) {
122 if (id == st->codec->codec_id)
125 if (avctag->id == st->codec->codec_id)
130 if (id != AV_CODEC_ID_NONE)
132 if (tag && (st->codec->strict_std_compliance >= FF_COMPLIANCE_NORMAL))
138 static int init_muxer(AVFormatContext *s, AVDictionary **options)
142 AVDictionary *tmp = NULL;
143 AVCodecContext *codec = NULL;
144 AVOutputFormat *of = s->oformat;
147 av_dict_copy(&tmp, *options, 0);
149 if ((ret = av_opt_set_dict(s, &tmp)) < 0)
152 // some sanity checks
153 if (s->nb_streams == 0 && !(of->flags & AVFMT_NOSTREAMS)) {
154 av_log(s, AV_LOG_ERROR, "no streams\n");
155 ret = AVERROR(EINVAL);
159 for (i = 0; i < s->nb_streams; i++) {
163 switch (codec->codec_type) {
164 case AVMEDIA_TYPE_AUDIO:
165 if (codec->sample_rate <= 0) {
166 av_log(s, AV_LOG_ERROR, "sample rate not set\n");
167 ret = AVERROR(EINVAL);
170 if (!codec->block_align)
171 codec->block_align = codec->channels *
172 av_get_bits_per_sample(codec->codec_id) >> 3;
174 case AVMEDIA_TYPE_VIDEO:
175 if (codec->time_base.num <= 0 ||
176 codec->time_base.den <= 0) { //FIXME audio too?
177 av_log(s, AV_LOG_ERROR, "time base not set\n");
178 ret = AVERROR(EINVAL);
182 if ((codec->width <= 0 || codec->height <= 0) &&
183 !(of->flags & AVFMT_NODIMENSIONS)) {
184 av_log(s, AV_LOG_ERROR, "dimensions not set\n");
185 ret = AVERROR(EINVAL);
189 if (av_cmp_q(st->sample_aspect_ratio,
190 codec->sample_aspect_ratio)) {
191 if (st->sample_aspect_ratio.num != 0 &&
192 st->sample_aspect_ratio.den != 0 &&
193 codec->sample_aspect_ratio.den != 0 &&
194 codec->sample_aspect_ratio.den != 0) {
195 av_log(s, AV_LOG_ERROR, "Aspect ratio mismatch between muxer "
196 "(%d/%d) and encoder layer (%d/%d)\n",
197 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
198 codec->sample_aspect_ratio.num,
199 codec->sample_aspect_ratio.den);
200 ret = AVERROR(EINVAL);
208 if (codec->codec_tag &&
209 codec->codec_id == AV_CODEC_ID_RAWVIDEO &&
210 !av_codec_get_tag(of->codec_tag, codec->codec_id) &&
211 !validate_codec_tag(s, st)) {
212 // the current rawvideo encoding system ends up setting
213 // the wrong codec_tag for avi, we override it here
214 codec->codec_tag = 0;
216 if (codec->codec_tag) {
217 if (!validate_codec_tag(s, st)) {
219 av_get_codec_tag_string(tagbuf, sizeof(tagbuf), codec->codec_tag);
220 av_log(s, AV_LOG_ERROR,
221 "Tag %s/0x%08x incompatible with output codec id '%d'\n",
222 tagbuf, codec->codec_tag, codec->codec_id);
223 ret = AVERROR_INVALIDDATA;
227 codec->codec_tag = av_codec_get_tag(of->codec_tag, codec->codec_id);
230 if (of->flags & AVFMT_GLOBALHEADER &&
231 !(codec->flags & CODEC_FLAG_GLOBAL_HEADER))
232 av_log(s, AV_LOG_WARNING,
233 "Codec for stream %d does not use global headers "
234 "but container format requires global headers\n", i);
237 if (!s->priv_data && of->priv_data_size > 0) {
238 s->priv_data = av_mallocz(of->priv_data_size);
240 ret = AVERROR(ENOMEM);
243 if (of->priv_class) {
244 *(const AVClass **)s->priv_data = of->priv_class;
245 av_opt_set_defaults(s->priv_data);
246 if ((ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)
251 /* set muxer identification string */
252 if (s->nb_streams && !(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
253 av_dict_set(&s->metadata, "encoder", LIBAVFORMAT_IDENT, 0);
257 av_dict_free(options);
268 static int init_pts(AVFormatContext *s)
273 /* init PTS generation */
274 for (i = 0; i < s->nb_streams; i++) {
275 int64_t den = AV_NOPTS_VALUE;
278 switch (st->codec->codec_type) {
279 case AVMEDIA_TYPE_AUDIO:
280 den = (int64_t)st->time_base.num * st->codec->sample_rate;
282 case AVMEDIA_TYPE_VIDEO:
283 den = (int64_t)st->time_base.num * st->codec->time_base.den;
288 if (den != AV_NOPTS_VALUE) {
290 return AVERROR_INVALIDDATA;
292 frac_init(&st->pts, 0, 0, den);
299 int avformat_write_header(AVFormatContext *s, AVDictionary **options)
303 if (ret = init_muxer(s, options))
306 if (s->oformat->write_header) {
307 ret = s->oformat->write_header(s);
312 if ((ret = init_pts(s)) < 0)
318 //FIXME merge with compute_pkt_fields
319 static int compute_pkt_fields2(AVFormatContext *s, AVStream *st, AVPacket *pkt)
321 int delay = FFMAX(st->codec->has_b_frames, !!st->codec->max_b_frames);
322 int num, den, frame_size, i;
324 av_dlog(s, "compute_pkt_fields2: pts:%" PRId64 " dts:%" PRId64 " cur_dts:%" PRId64 " b:%d size:%d st:%d\n",
325 pkt->pts, pkt->dts, st->cur_dts, delay, pkt->size, pkt->stream_index);
327 /* if(pkt->pts == AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE)
328 * return AVERROR(EINVAL);*/
331 if (pkt->duration == 0) {
332 ff_compute_frame_duration(&num, &den, st, NULL, pkt);
334 pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den * st->codec->ticks_per_frame, den * (int64_t)st->time_base.num);
338 if (pkt->pts == AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE && delay == 0)
341 //XXX/FIXME this is a temporary hack until all encoders output pts
342 if ((pkt->pts == 0 || pkt->pts == AV_NOPTS_VALUE) && pkt->dts == AV_NOPTS_VALUE && !delay) {
344 // pkt->pts= st->cur_dts;
345 pkt->pts = st->pts.val;
348 //calculate dts from pts
349 if (pkt->pts != AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {
350 st->pts_buffer[0] = pkt->pts;
351 for (i = 1; i < delay + 1 && st->pts_buffer[i] == AV_NOPTS_VALUE; i++)
352 st->pts_buffer[i] = pkt->pts + (i - delay - 1) * pkt->duration;
353 for (i = 0; i<delay && st->pts_buffer[i] > st->pts_buffer[i + 1]; i++)
354 FFSWAP(int64_t, st->pts_buffer[i], st->pts_buffer[i + 1]);
356 pkt->dts = st->pts_buffer[0];
359 if (st->cur_dts && st->cur_dts != AV_NOPTS_VALUE &&
360 ((!(s->oformat->flags & AVFMT_TS_NONSTRICT) &&
361 st->cur_dts >= pkt->dts) || st->cur_dts > pkt->dts)) {
362 av_log(s, AV_LOG_ERROR,
363 "Application provided invalid, non monotonically increasing dts to muxer in stream %d: %" PRId64 " >= %" PRId64 "\n",
364 st->index, st->cur_dts, pkt->dts);
365 return AVERROR(EINVAL);
367 if (pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts < pkt->dts) {
368 av_log(s, AV_LOG_ERROR, "pts < dts in stream %d\n", st->index);
369 return AVERROR(EINVAL);
372 av_dlog(s, "av_write_frame: pts2:%"PRId64" dts2:%"PRId64"\n",
374 st->cur_dts = pkt->dts;
375 st->pts.val = pkt->dts;
378 switch (st->codec->codec_type) {
379 case AVMEDIA_TYPE_AUDIO:
380 frame_size = ff_get_audio_frame_size(st->codec, pkt->size, 1);
382 /* HACK/FIXME, we skip the initial 0 size packets as they are most
383 * likely equal to the encoder delay, but it would be better if we
384 * had the real timestamps from the encoder */
385 if (frame_size >= 0 && (pkt->size || st->pts.num != st->pts.den >> 1 || st->pts.val)) {
386 frac_add(&st->pts, (int64_t)st->time_base.den * frame_size);
389 case AVMEDIA_TYPE_VIDEO:
390 frac_add(&st->pts, (int64_t)st->time_base.den * st->codec->time_base.num);
399 * FIXME: this function should NEVER get undefined pts/dts beside when the
400 * AVFMT_NOTIMESTAMPS is set.
401 * Those additional safety checks should be dropped once the correct checks
402 * are set in the callers.
405 static int write_packet(AVFormatContext *s, AVPacket *pkt)
408 if (!(s->oformat->flags & (AVFMT_TS_NEGATIVE | AVFMT_NOTIMESTAMPS))) {
409 AVRational time_base = s->streams[pkt->stream_index]->time_base;
412 if (!s->offset && pkt->dts != AV_NOPTS_VALUE && pkt->dts < 0) {
413 s->offset = -pkt->dts;
414 s->offset_timebase = time_base;
417 offset = av_rescale_q(s->offset, s->offset_timebase, time_base);
419 if (pkt->dts != AV_NOPTS_VALUE)
421 if (pkt->pts != AV_NOPTS_VALUE)
424 ret = s->oformat->write_packet(s, pkt);
426 if (s->pb && ret >= 0 && s->flags & AVFMT_FLAG_FLUSH_PACKETS)
432 int av_write_frame(AVFormatContext *s, AVPacket *pkt)
437 if (s->oformat->flags & AVFMT_ALLOW_FLUSH)
438 return s->oformat->write_packet(s, pkt);
442 ret = compute_pkt_fields2(s, s->streams[pkt->stream_index], pkt);
444 if (ret < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
447 ret = write_packet(s, pkt);
450 s->streams[pkt->stream_index]->nb_frames++;
454 void ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
455 int (*compare)(AVFormatContext *, AVPacket *, AVPacket *))
457 AVPacketList **next_point, *this_pktl;
459 this_pktl = av_mallocz(sizeof(AVPacketList));
460 this_pktl->pkt = *pkt;
461 #if FF_API_DESTRUCT_PACKET
462 FF_DISABLE_DEPRECATION_WARNINGS
463 pkt->destruct = NULL; // do not free original but only the copy
464 FF_ENABLE_DEPRECATION_WARNINGS
467 av_dup_packet(&this_pktl->pkt); // duplicate the packet if it uses non-alloced memory
469 if (s->streams[pkt->stream_index]->last_in_packet_buffer) {
470 next_point = &(s->streams[pkt->stream_index]->last_in_packet_buffer->next);
472 next_point = &s->packet_buffer;
475 if (compare(s, &s->packet_buffer_end->pkt, pkt)) {
476 while (!compare(s, &(*next_point)->pkt, pkt))
477 next_point = &(*next_point)->next;
480 next_point = &(s->packet_buffer_end->next);
483 assert(!*next_point);
485 s->packet_buffer_end = this_pktl;
488 this_pktl->next = *next_point;
490 s->streams[pkt->stream_index]->last_in_packet_buffer =
491 *next_point = this_pktl;
494 static int interleave_compare_dts(AVFormatContext *s, AVPacket *next,
497 AVStream *st = s->streams[pkt->stream_index];
498 AVStream *st2 = s->streams[next->stream_index];
499 int comp = av_compare_ts(next->dts, st2->time_base, pkt->dts,
503 return pkt->stream_index < next->stream_index;
507 int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
508 AVPacket *pkt, int flush)
511 int stream_count = 0;
515 ff_interleave_add_packet(s, pkt, interleave_compare_dts);
518 for (i = 0; i < s->nb_streams; i++)
519 stream_count += !!s->streams[i]->last_in_packet_buffer;
521 if (stream_count && (s->nb_streams == stream_count || flush)) {
522 pktl = s->packet_buffer;
525 s->packet_buffer = pktl->next;
526 if (!s->packet_buffer)
527 s->packet_buffer_end = NULL;
529 if (s->streams[out->stream_index]->last_in_packet_buffer == pktl)
530 s->streams[out->stream_index]->last_in_packet_buffer = NULL;
540 * Interleave an AVPacket correctly so it can be muxed.
541 * @param out the interleaved packet will be output here
542 * @param in the input packet
543 * @param flush 1 if no further packets are available as input and all
544 * remaining packets should be output
545 * @return 1 if a packet was output, 0 if no packet could be output,
546 * < 0 if an error occurred
548 static int interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *in, int flush)
550 if (s->oformat->interleave_packet) {
551 int ret = s->oformat->interleave_packet(s, out, in, flush);
556 return ff_interleave_packet_per_dts(s, out, in, flush);
559 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt)
564 AVStream *st = s->streams[pkt->stream_index];
566 //FIXME/XXX/HACK drop zero sized packets
567 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && pkt->size == 0)
570 av_dlog(s, "av_interleaved_write_frame size:%d dts:%" PRId64 " pts:%" PRId64 "\n",
571 pkt->size, pkt->dts, pkt->pts);
572 if ((ret = compute_pkt_fields2(s, st, pkt)) < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
575 if (pkt->dts == AV_NOPTS_VALUE && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
576 return AVERROR(EINVAL);
578 av_dlog(s, "av_interleaved_write_frame FLUSH\n");
584 int ret = interleave_packet(s, &opkt, pkt, flush);
585 if (ret <= 0) //FIXME cleanup needed for ret<0 ?
588 ret = write_packet(s, &opkt);
590 s->streams[opkt.stream_index]->nb_frames++;
592 av_free_packet(&opkt);
600 int av_write_trailer(AVFormatContext *s)
606 ret = interleave_packet(s, &pkt, NULL, 1);
607 if (ret < 0) //FIXME cleanup needed for ret<0 ?
612 ret = write_packet(s, &pkt);
614 s->streams[pkt.stream_index]->nb_frames++;
616 av_free_packet(&pkt);
622 if (s->oformat->write_trailer)
623 ret = s->oformat->write_trailer(s);
625 if (!(s->oformat->flags & AVFMT_NOFILE))
629 for (i = 0; i < s->nb_streams; i++) {
630 av_freep(&s->streams[i]->priv_data);
631 av_freep(&s->streams[i]->index_entries);
633 if (s->oformat->priv_class)
634 av_opt_free(s->priv_data);
635 av_freep(&s->priv_data);
639 int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
640 AVFormatContext *src)
645 local_pkt.stream_index = dst_stream;
646 if (pkt->pts != AV_NOPTS_VALUE)
647 local_pkt.pts = av_rescale_q(pkt->pts,
648 src->streams[pkt->stream_index]->time_base,
649 dst->streams[dst_stream]->time_base);
650 if (pkt->dts != AV_NOPTS_VALUE)
651 local_pkt.dts = av_rescale_q(pkt->dts,
652 src->streams[pkt->stream_index]->time_base,
653 dst->streams[dst_stream]->time_base);
654 return av_write_frame(dst, &local_pkt);