FFmpeg: libavformat/mux.c Source File

00001 /*
00002  * muxing functions for use within FFmpeg
00003  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 /* #define DEBUG */
00023 
00024 #include "avformat.h"
00025 #include "avio_internal.h"
00026 #include "internal.h"
00027 #include "libavcodec/internal.h"
00028 #include "libavcodec/bytestream.h"
00029 #include "libavutil/opt.h"
00030 #include "libavutil/dict.h"
00031 #include "libavutil/pixdesc.h"
00032 #include "libavutil/timestamp.h"
00033 #include "metadata.h"
00034 #include "id3v2.h"
00035 #include "libavutil/avassert.h"
00036 #include "libavutil/avstring.h"
00037 #include "libavutil/mathematics.h"
00038 #include "libavutil/parseutils.h"
00039 #include "libavutil/time.h"
00040 #include "riff.h"
00041 #include "audiointerleave.h"
00042 #include "url.h"
00043 #include <stdarg.h>
00044 #if CONFIG_NETWORK
00045 #include "network.h"
00046 #endif
00047 
00048 #undef NDEBUG
00049 #include <assert.h>
00050 
00056 /* fraction handling */
00057 
00068 static void frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den)
00069 {
00070     num += (den >> 1);
00071     if (num >= den) {
00072         val += num / den;
00073         num  = num % den;
00074     }
00075     f->val = val;
00076     f->num = num;
00077     f->den = den;
00078 }
00079 
00086 static void frac_add(AVFrac *f, int64_t incr)
00087 {
00088     int64_t num, den;
00089 
00090     num = f->num + incr;
00091     den = f->den;
00092     if (num < 0) {
00093         f->val += num / den;
00094         num     = num % den;
00095         if (num < 0) {
00096             num += den;
00097             f->val--;
00098         }
00099     } else if (num >= den) {
00100         f->val += num / den;
00101         num     = num % den;
00102     }
00103     f->num = num;
00104 }
00105 
00106 AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precission)
00107 {
00108     AVRational q;
00109     int j;
00110 
00111     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
00112         q = (AVRational){1, st->codec->sample_rate};
00113     } else {
00114         q = st->codec->time_base;
00115     }
00116     for (j=2; j<14; j+= 1+(j>2))
00117         while (q.den / q.num < min_precission && q.num % j == 0)
00118             q.num /= j;
00119     while (q.den / q.num < min_precission && q.den < (1<<24))
00120         q.den <<= 1;
00121 
00122     return q;
00123 }
00124 
00125 int avformat_alloc_output_context2(AVFormatContext **avctx, AVOutputFormat *oformat,
00126                                    const char *format, const char *filename)
00127 {
00128     AVFormatContext *s = avformat_alloc_context();
00129     int ret = 0;
00130 
00131     *avctx = NULL;
00132     if (!s)
00133         goto nomem;
00134 
00135     if (!oformat) {
00136         if (format) {
00137             oformat = av_guess_format(format, NULL, NULL);
00138             if (!oformat) {
00139                 av_log(s, AV_LOG_ERROR, "Requested output format '%s' is not a suitable output format\n", format);
00140                 ret = AVERROR(EINVAL);
00141                 goto error;
00142             }
00143         } else {
00144             oformat = av_guess_format(NULL, filename, NULL);
00145             if (!oformat) {
00146                 ret = AVERROR(EINVAL);
00147                 av_log(s, AV_LOG_ERROR, "Unable to find a suitable output format for '%s'\n",
00148                        filename);
00149                 goto error;
00150             }
00151         }
00152     }
00153 
00154     s->oformat = oformat;
00155     if (s->oformat->priv_data_size > 0) {
00156         s->priv_data = av_mallocz(s->oformat->priv_data_size);
00157         if (!s->priv_data)
00158             goto nomem;
00159         if (s->oformat->priv_class) {
00160             *(const AVClass**)s->priv_data= s->oformat->priv_class;
00161             av_opt_set_defaults(s->priv_data);
00162         }
00163     } else
00164         s->priv_data = NULL;
00165 
00166     if (filename)
00167         av_strlcpy(s->filename, filename, sizeof(s->filename));
00168     *avctx = s;
00169     return 0;
00170 nomem:
00171     av_log(s, AV_LOG_ERROR, "Out of memory\n");
00172     ret = AVERROR(ENOMEM);
00173 error:
00174     avformat_free_context(s);
00175     return ret;
00176 }
00177 
00178 #if FF_API_ALLOC_OUTPUT_CONTEXT
00179 AVFormatContext *avformat_alloc_output_context(const char *format,
00180                                                AVOutputFormat *oformat, const char *filename)
00181 {
00182     AVFormatContext *avctx;
00183     int ret = avformat_alloc_output_context2(&avctx, oformat, format, filename);
00184     return ret < 0 ? NULL : avctx;
00185 }
00186 #endif
00187 
00188 static int validate_codec_tag(AVFormatContext *s, AVStream *st)
00189 {
00190     const AVCodecTag *avctag;
00191     int n;
00192     enum AVCodecID id = AV_CODEC_ID_NONE;
00193     unsigned int tag  = 0;
00194 
00201     for (n = 0; s->oformat->codec_tag[n]; n++) {
00202         avctag = s->oformat->codec_tag[n];
00203         while (avctag->id != AV_CODEC_ID_NONE) {
00204             if (avpriv_toupper4(avctag->tag) == avpriv_toupper4(st->codec->codec_tag)) {
00205                 id = avctag->id;
00206                 if (id == st->codec->codec_id)
00207                     return 1;
00208             }
00209             if (avctag->id == st->codec->codec_id)
00210                 tag = avctag->tag;
00211             avctag++;
00212         }
00213     }
00214     if (id != AV_CODEC_ID_NONE)
00215         return 0;
00216     if (tag && (st->codec->strict_std_compliance >= FF_COMPLIANCE_NORMAL))
00217         return 0;
00218     return 1;
00219 }
00220 
00221 
00222 static int init_muxer(AVFormatContext *s, AVDictionary **options)
00223 {
00224     int ret = 0, i;
00225     AVStream *st;
00226     AVDictionary *tmp = NULL;
00227     AVCodecContext *codec = NULL;
00228     AVOutputFormat *of = s->oformat;
00229 
00230     if (options)
00231         av_dict_copy(&tmp, *options, 0);
00232 
00233     if ((ret = av_opt_set_dict(s, &tmp)) < 0)
00234         goto fail;
00235     if (s->priv_data && s->oformat->priv_class && *(const AVClass**)s->priv_data==s->oformat->priv_class &&
00236         (ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)
00237         goto fail;
00238 
00239     // some sanity checks
00240     if (s->nb_streams == 0 && !(of->flags & AVFMT_NOSTREAMS)) {
00241         av_log(s, AV_LOG_ERROR, "no streams\n");
00242         ret = AVERROR(EINVAL);
00243         goto fail;
00244     }
00245 
00246     for (i = 0; i < s->nb_streams; i++) {
00247         st    = s->streams[i];
00248         codec = st->codec;
00249 
00250         switch (codec->codec_type) {
00251         case AVMEDIA_TYPE_AUDIO:
00252             if (codec->sample_rate <= 0) {
00253                 av_log(s, AV_LOG_ERROR, "sample rate not set\n");
00254                 ret = AVERROR(EINVAL);
00255                 goto fail;
00256             }
00257             if (!codec->block_align)
00258                 codec->block_align = codec->channels *
00259                                      av_get_bits_per_sample(codec->codec_id) >> 3;
00260             break;
00261         case AVMEDIA_TYPE_VIDEO:
00262             if (codec->time_base.num <= 0 ||
00263                 codec->time_base.den <= 0) { //FIXME audio too?
00264                 av_log(s, AV_LOG_ERROR, "time base not set\n");
00265                 ret = AVERROR(EINVAL);
00266                 goto fail;
00267             }
00268 
00269             if ((codec->width <= 0 || codec->height <= 0) &&
00270                 !(of->flags & AVFMT_NODIMENSIONS)) {
00271                 av_log(s, AV_LOG_ERROR, "dimensions not set\n");
00272                 ret = AVERROR(EINVAL);
00273                 goto fail;
00274             }
00275             if (av_cmp_q(st->sample_aspect_ratio, codec->sample_aspect_ratio)
00276                 && FFABS(av_q2d(st->sample_aspect_ratio) - av_q2d(codec->sample_aspect_ratio)) > 0.004*av_q2d(st->sample_aspect_ratio)
00277             ) {
00278                 av_log(s, AV_LOG_ERROR, "Aspect ratio mismatch between muxer "
00279                                         "(%d/%d) and encoder layer (%d/%d)\n",
00280                        st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
00281                        codec->sample_aspect_ratio.num,
00282                        codec->sample_aspect_ratio.den);
00283                 ret = AVERROR(EINVAL);
00284                 goto fail;
00285             }
00286             break;
00287         }
00288 
00289         if (of->codec_tag) {
00290             if (   codec->codec_tag
00291                 && codec->codec_id == AV_CODEC_ID_RAWVIDEO
00292                 && (   av_codec_get_tag(of->codec_tag, codec->codec_id) == 0
00293                     || av_codec_get_tag(of->codec_tag, codec->codec_id) == MKTAG('r', 'a', 'w', ' '))
00294                 && !validate_codec_tag(s, st)) {
00295                 // the current rawvideo encoding system ends up setting
00296                 // the wrong codec_tag for avi/mov, we override it here
00297                 codec->codec_tag = 0;
00298             }
00299             if (codec->codec_tag) {
00300                 if (!validate_codec_tag(s, st)) {
00301                     char tagbuf[32], cortag[32];
00302                     av_get_codec_tag_string(tagbuf, sizeof(tagbuf), codec->codec_tag);
00303                     av_get_codec_tag_string(cortag, sizeof(cortag), av_codec_get_tag(s->oformat->codec_tag, codec->codec_id));
00304                     av_log(s, AV_LOG_ERROR,
00305                            "Tag %s/0x%08x incompatible with output codec id '%d' (%s)\n",
00306                            tagbuf, codec->codec_tag, codec->codec_id, cortag);
00307                     ret = AVERROR_INVALIDDATA;
00308                     goto fail;
00309                 }
00310             } else
00311                 codec->codec_tag = av_codec_get_tag(of->codec_tag, codec->codec_id);
00312         }
00313 
00314         if (of->flags & AVFMT_GLOBALHEADER &&
00315             !(codec->flags & CODEC_FLAG_GLOBAL_HEADER))
00316             av_log(s, AV_LOG_WARNING,
00317                    "Codec for stream %d does not use global headers "
00318                    "but container format requires global headers\n", i);
00319     }
00320 
00321     if (!s->priv_data && of->priv_data_size > 0) {
00322         s->priv_data = av_mallocz(of->priv_data_size);
00323         if (!s->priv_data) {
00324             ret = AVERROR(ENOMEM);
00325             goto fail;
00326         }
00327         if (of->priv_class) {
00328             *(const AVClass **)s->priv_data = of->priv_class;
00329             av_opt_set_defaults(s->priv_data);
00330             if ((ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)
00331                 goto fail;
00332         }
00333     }
00334 
00335     /* set muxer identification string */
00336     if (s->nb_streams && !(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
00337         av_dict_set(&s->metadata, "encoder", LIBAVFORMAT_IDENT, 0);
00338     }
00339 
00340     if (options) {
00341          av_dict_free(options);
00342          *options = tmp;
00343     }
00344 
00345     return 0;
00346 
00347 fail:
00348     av_dict_free(&tmp);
00349     return ret;
00350 }
00351 
00352 static int init_pts(AVFormatContext *s)
00353 {
00354     int i;
00355     AVStream *st;
00356 
00357     /* init PTS generation */
00358     for (i = 0; i < s->nb_streams; i++) {
00359         int64_t den = AV_NOPTS_VALUE;
00360         st = s->streams[i];
00361 
00362         switch (st->codec->codec_type) {
00363         case AVMEDIA_TYPE_AUDIO:
00364             den = (int64_t)st->time_base.num * st->codec->sample_rate;
00365             break;
00366         case AVMEDIA_TYPE_VIDEO:
00367             den = (int64_t)st->time_base.num * st->codec->time_base.den;
00368             break;
00369         default:
00370             break;
00371         }
00372         if (den != AV_NOPTS_VALUE) {
00373             if (den <= 0)
00374                 return AVERROR_INVALIDDATA;
00375 
00376             frac_init(&st->pts, 0, 0, den);
00377         }
00378     }
00379 
00380     return 0;
00381 }
00382 
00383 int avformat_write_header(AVFormatContext *s, AVDictionary **options)
00384 {
00385     int ret = 0;
00386 
00387     if (ret = init_muxer(s, options))
00388         return ret;
00389 
00390     if (s->oformat->write_header) {
00391         ret = s->oformat->write_header(s);
00392         if (ret >= 0 && s->pb && s->pb->error < 0)
00393             ret = s->pb->error;
00394         if (ret < 0)
00395             return ret;
00396     }
00397 
00398     if ((ret = init_pts(s) < 0))
00399         return ret;
00400 
00401     return 0;
00402 }
00403 
00404 //FIXME merge with compute_pkt_fields
00405 static int compute_pkt_fields2(AVFormatContext *s, AVStream *st, AVPacket *pkt)
00406 {
00407     int delay = FFMAX(st->codec->has_b_frames, st->codec->max_b_frames > 0);
00408     int num, den, frame_size, i;
00409 
00410     av_dlog(s, "compute_pkt_fields2: pts:%s dts:%s cur_dts:%s b:%d size:%d st:%d\n",
00411             av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts), delay, pkt->size, pkt->stream_index);
00412 
00413     /* duration field */
00414     if (pkt->duration == 0) {
00415         ff_compute_frame_duration(&num, &den, st, NULL, pkt);
00416         if (den && num) {
00417             pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den * st->codec->ticks_per_frame, den * (int64_t)st->time_base.num);
00418         }
00419     }
00420 
00421     if (pkt->pts == AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE && delay == 0)
00422         pkt->pts = pkt->dts;
00423 
00424     //XXX/FIXME this is a temporary hack until all encoders output pts
00425     if ((pkt->pts == 0 || pkt->pts == AV_NOPTS_VALUE) && pkt->dts == AV_NOPTS_VALUE && !delay) {
00426         static int warned;
00427         if (!warned) {
00428             av_log(s, AV_LOG_WARNING, "Encoder did not produce proper pts, making some up.\n");
00429             warned = 1;
00430         }
00431         pkt->dts =
00432 //        pkt->pts= st->cur_dts;
00433             pkt->pts = st->pts.val;
00434     }
00435 
00436     //calculate dts from pts
00437     if (pkt->pts != AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {
00438         st->pts_buffer[0] = pkt->pts;
00439         for (i = 1; i < delay + 1 && st->pts_buffer[i] == AV_NOPTS_VALUE; i++)
00440             st->pts_buffer[i] = pkt->pts + (i - delay - 1) * pkt->duration;
00441         for (i = 0; i<delay && st->pts_buffer[i] > st->pts_buffer[i + 1]; i++)
00442             FFSWAP(int64_t, st->pts_buffer[i], st->pts_buffer[i + 1]);
00443 
00444         pkt->dts = st->pts_buffer[0];
00445     }
00446 
00447     if (st->cur_dts && st->cur_dts != AV_NOPTS_VALUE &&
00448         ((!(s->oformat->flags & AVFMT_TS_NONSTRICT) &&
00449           st->cur_dts >= pkt->dts) || st->cur_dts > pkt->dts)) {
00450         av_log(s, AV_LOG_ERROR,
00451                "Application provided invalid, non monotonically increasing dts to muxer in stream %d: %s >= %s\n",
00452                st->index, av_ts2str(st->cur_dts), av_ts2str(pkt->dts));
00453         return AVERROR(EINVAL);
00454     }
00455     if (pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts < pkt->dts) {
00456         av_log(s, AV_LOG_ERROR, "pts (%s) < dts (%s) in stream %d\n",
00457                av_ts2str(pkt->pts), av_ts2str(pkt->dts), st->index);
00458         return AVERROR(EINVAL);
00459     }
00460 
00461     av_dlog(s, "av_write_frame: pts2:%s dts2:%s\n",
00462             av_ts2str(pkt->pts), av_ts2str(pkt->dts));
00463     st->cur_dts = pkt->dts;
00464     st->pts.val = pkt->dts;
00465 
00466     /* update pts */
00467     switch (st->codec->codec_type) {
00468     case AVMEDIA_TYPE_AUDIO:
00469         frame_size = ff_get_audio_frame_size(st->codec, pkt->size, 1);
00470 
00471         /* HACK/FIXME, we skip the initial 0 size packets as they are most
00472          * likely equal to the encoder delay, but it would be better if we
00473          * had the real timestamps from the encoder */
00474         if (frame_size >= 0 && (pkt->size || st->pts.num != st->pts.den >> 1 || st->pts.val)) {
00475             frac_add(&st->pts, (int64_t)st->time_base.den * frame_size);
00476         }
00477         break;
00478     case AVMEDIA_TYPE_VIDEO:
00479         frac_add(&st->pts, (int64_t)st->time_base.den * st->codec->time_base.num);
00480         break;
00481     default:
00482         break;
00483     }
00484     return 0;
00485 }
00486 
00487 int av_write_frame(AVFormatContext *s, AVPacket *pkt)
00488 {
00489     int ret;
00490 
00491     if (!pkt) {
00492         if (s->oformat->flags & AVFMT_ALLOW_FLUSH) {
00493             ret = s->oformat->write_packet(s, pkt);
00494             if (ret >= 0 && s->pb && s->pb->error < 0)
00495                 ret = s->pb->error;
00496             return ret;
00497         }
00498         return 1;
00499     }
00500 
00501     ret = compute_pkt_fields2(s, s->streams[pkt->stream_index], pkt);
00502 
00503     if (ret < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
00504         return ret;
00505 
00506     ret = s->oformat->write_packet(s, pkt);
00507     if (ret >= 0 && s->pb && s->pb->error < 0)
00508         ret = s->pb->error;
00509 
00510     if (ret >= 0)
00511         s->streams[pkt->stream_index]->nb_frames++;
00512     return ret;
00513 }
00514 
00515 #define CHUNK_START 0x1000
00516 
00517 int ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
00518                               int (*compare)(AVFormatContext *, AVPacket *, AVPacket *))
00519 {
00520     AVPacketList **next_point, *this_pktl;
00521     AVStream *st   = s->streams[pkt->stream_index];
00522     int chunked    = s->max_chunk_size || s->max_chunk_duration;
00523 
00524     this_pktl      = av_mallocz(sizeof(AVPacketList));
00525     if (!this_pktl)
00526         return AVERROR(ENOMEM);
00527     this_pktl->pkt = *pkt;
00528     pkt->destruct  = NULL;           // do not free original but only the copy
00529     av_dup_packet(&this_pktl->pkt);  // duplicate the packet if it uses non-allocated memory
00530 
00531     if (s->streams[pkt->stream_index]->last_in_packet_buffer) {
00532         next_point = &(st->last_in_packet_buffer->next);
00533     } else {
00534         next_point = &s->packet_buffer;
00535     }
00536 
00537     if (*next_point) {
00538         if (chunked) {
00539             uint64_t max= av_rescale_q(s->max_chunk_duration, AV_TIME_BASE_Q, st->time_base);
00540             if (   st->interleaver_chunk_size     + pkt->size     <= s->max_chunk_size-1U
00541                 && st->interleaver_chunk_duration + pkt->duration <= max-1U) {
00542                 st->interleaver_chunk_size     += pkt->size;
00543                 st->interleaver_chunk_duration += pkt->duration;
00544                 goto next_non_null;
00545             } else {
00546                 st->interleaver_chunk_size     =
00547                 st->interleaver_chunk_duration = 0;
00548                 this_pktl->pkt.flags |= CHUNK_START;
00549             }
00550         }
00551 
00552         if (compare(s, &s->packet_buffer_end->pkt, pkt)) {
00553             while (   *next_point
00554                    && ((chunked && !((*next_point)->pkt.flags&CHUNK_START))
00555                        || !compare(s, &(*next_point)->pkt, pkt)))
00556                 next_point = &(*next_point)->next;
00557             if (*next_point)
00558                 goto next_non_null;
00559         } else {
00560             next_point = &(s->packet_buffer_end->next);
00561         }
00562     }
00563     av_assert1(!*next_point);
00564 
00565     s->packet_buffer_end = this_pktl;
00566 next_non_null:
00567 
00568     this_pktl->next = *next_point;
00569 
00570     s->streams[pkt->stream_index]->last_in_packet_buffer =
00571         *next_point                                      = this_pktl;
00572     return 0;
00573 }
00574 
00575 static int ff_interleave_compare_dts(AVFormatContext *s, AVPacket *next, AVPacket *pkt)
00576 {
00577     AVStream *st  = s->streams[pkt->stream_index];
00578     AVStream *st2 = s->streams[next->stream_index];
00579     int comp      = av_compare_ts(next->dts, st2->time_base, pkt->dts,
00580                                   st->time_base);
00581     if (s->audio_preload && ((st->codec->codec_type == AVMEDIA_TYPE_AUDIO) != (st2->codec->codec_type == AVMEDIA_TYPE_AUDIO))) {
00582         int64_t ts = av_rescale_q(pkt ->dts, st ->time_base, AV_TIME_BASE_Q) - s->audio_preload*(st ->codec->codec_type == AVMEDIA_TYPE_AUDIO);
00583         int64_t ts2= av_rescale_q(next->dts, st2->time_base, AV_TIME_BASE_Q) - s->audio_preload*(st2->codec->codec_type == AVMEDIA_TYPE_AUDIO);
00584         if (ts == ts2) {
00585             ts= ( pkt ->dts* st->time_base.num*AV_TIME_BASE - s->audio_preload*(int64_t)(st ->codec->codec_type == AVMEDIA_TYPE_AUDIO)* st->time_base.den)*st2->time_base.den
00586                -( next->dts*st2->time_base.num*AV_TIME_BASE - s->audio_preload*(int64_t)(st2->codec->codec_type == AVMEDIA_TYPE_AUDIO)*st2->time_base.den)* st->time_base.den;
00587             ts2=0;
00588         }
00589         comp= (ts>ts2) - (ts<ts2);
00590     }
00591 
00592     if (comp == 0)
00593         return pkt->stream_index < next->stream_index;
00594     return comp > 0;
00595 }
00596 
00597 int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
00598                                  AVPacket *pkt, int flush)
00599 {
00600     AVPacketList *pktl;
00601     int stream_count = 0, noninterleaved_count = 0;
00602     int64_t delta_dts_max = 0;
00603     int i, ret;
00604 
00605     if (pkt) {
00606         ret = ff_interleave_add_packet(s, pkt, ff_interleave_compare_dts);
00607         if (ret < 0)
00608             return ret;
00609     }
00610 
00611     for (i = 0; i < s->nb_streams; i++) {
00612         if (s->streams[i]->last_in_packet_buffer) {
00613             ++stream_count;
00614         } else if (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
00615             ++noninterleaved_count;
00616         }
00617     }
00618 
00619     if (s->nb_streams == stream_count) {
00620         flush = 1;
00621     } else if (!flush) {
00622         for (i=0; i < s->nb_streams; i++) {
00623             if (s->streams[i]->last_in_packet_buffer) {
00624                 int64_t delta_dts =
00625                     av_rescale_q(s->streams[i]->last_in_packet_buffer->pkt.dts,
00626                                 s->streams[i]->time_base,
00627                                 AV_TIME_BASE_Q) -
00628                     av_rescale_q(s->packet_buffer->pkt.dts,
00629                                 s->streams[s->packet_buffer->pkt.stream_index]->time_base,
00630                                 AV_TIME_BASE_Q);
00631                 delta_dts_max= FFMAX(delta_dts_max, delta_dts);
00632             }
00633         }
00634         if (s->nb_streams == stream_count+noninterleaved_count &&
00635            delta_dts_max > 20*AV_TIME_BASE) {
00636             av_log(s, AV_LOG_DEBUG, "flushing with %d noninterleaved\n", noninterleaved_count);
00637             flush = 1;
00638         }
00639     }
00640     if (stream_count && flush) {
00641         AVStream *st;
00642         pktl = s->packet_buffer;
00643         *out = pktl->pkt;
00644         st   = s->streams[out->stream_index];
00645 
00646         s->packet_buffer = pktl->next;
00647         if (!s->packet_buffer)
00648             s->packet_buffer_end = NULL;
00649 
00650         if (st->last_in_packet_buffer == pktl)
00651             st->last_in_packet_buffer = NULL;
00652         av_freep(&pktl);
00653 
00654         if (s->avoid_negative_ts > 0) {
00655             if (out->dts != AV_NOPTS_VALUE) {
00656                 if (!st->mux_ts_offset && out->dts < 0) {
00657                     for (i = 0; i < s->nb_streams; i++) {
00658                         s->streams[i]->mux_ts_offset =
00659                             av_rescale_q_rnd(-out->dts,
00660                                              st->time_base,
00661                                              s->streams[i]->time_base,
00662                                              AV_ROUND_UP);
00663                     }
00664                 }
00665                 out->dts += st->mux_ts_offset;
00666             }
00667             if (out->pts != AV_NOPTS_VALUE)
00668                 out->pts += st->mux_ts_offset;
00669         }
00670 
00671         return 1;
00672     } else {
00673         av_init_packet(out);
00674         return 0;
00675     }
00676 }
00677 
00678 #if FF_API_INTERLEAVE_PACKET
00679 int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
00680                                  AVPacket *pkt, int flush)
00681 {
00682     return ff_interleave_packet_per_dts(s, out, pkt, flush);
00683 }
00684 
00685 #endif
00686 
00696 static int interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *in, int flush)
00697 {
00698     if (s->oformat->interleave_packet) {
00699         int ret = s->oformat->interleave_packet(s, out, in, flush);
00700         if (in)
00701             av_free_packet(in);
00702         return ret;
00703     } else
00704         return ff_interleave_packet_per_dts(s, out, in, flush);
00705 }
00706 
00707 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt)
00708 {
00709     int ret, flush = 0;
00710 
00711     if (pkt) {
00712         AVStream *st = s->streams[pkt->stream_index];
00713 
00714         //FIXME/XXX/HACK drop zero sized packets
00715         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && pkt->size == 0)
00716             return 0;
00717 
00718         av_dlog(s, "av_interleaved_write_frame size:%d dts:%s pts:%s\n",
00719                 pkt->size, av_ts2str(pkt->dts), av_ts2str(pkt->pts));
00720         if ((ret = compute_pkt_fields2(s, st, pkt)) < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
00721             return ret;
00722 
00723         if (pkt->dts == AV_NOPTS_VALUE && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
00724             return AVERROR(EINVAL);
00725     } else {
00726         av_dlog(s, "av_interleaved_write_frame FLUSH\n");
00727         flush = 1;
00728     }
00729 
00730     for (;; ) {
00731         AVPacket opkt;
00732         int ret = interleave_packet(s, &opkt, pkt, flush);
00733         if (ret <= 0) //FIXME cleanup needed for ret<0 ?
00734             return ret;
00735 
00736         ret = s->oformat->write_packet(s, &opkt);
00737         if (ret >= 0)
00738             s->streams[opkt.stream_index]->nb_frames++;
00739 
00740         av_free_packet(&opkt);
00741         pkt = NULL;
00742 
00743         if (ret < 0)
00744             return ret;
00745         if(s->pb && s->pb->error)
00746             return s->pb->error;
00747     }
00748 }
00749 
00750 int av_write_trailer(AVFormatContext *s)
00751 {
00752     int ret, i;
00753 
00754     for (;; ) {
00755         AVPacket pkt;
00756         ret = interleave_packet(s, &pkt, NULL, 1);
00757         if (ret < 0) //FIXME cleanup needed for ret<0 ?
00758             goto fail;
00759         if (!ret)
00760             break;
00761 
00762         ret = s->oformat->write_packet(s, &pkt);
00763         if (ret >= 0)
00764             s->streams[pkt.stream_index]->nb_frames++;
00765 
00766         av_free_packet(&pkt);
00767 
00768         if (ret < 0)
00769             goto fail;
00770         if(s->pb && s->pb->error)
00771             goto fail;
00772     }
00773 
00774     if (s->oformat->write_trailer)
00775         ret = s->oformat->write_trailer(s);
00776 
00777 fail:
00778     if (s->pb)
00779        avio_flush(s->pb);
00780     if (ret == 0)
00781        ret = s->pb ? s->pb->error : 0;
00782     for (i = 0; i < s->nb_streams; i++) {
00783         av_freep(&s->streams[i]->priv_data);
00784         av_freep(&s->streams[i]->index_entries);
00785     }
00786     if (s->oformat->priv_class)
00787         av_opt_free(s->priv_data);
00788     av_freep(&s->priv_data);
00789     return ret;
00790 }
00791 
00792 int av_get_output_timestamp(struct AVFormatContext *s, int stream,
00793                             int64_t *dts, int64_t *wall)
00794 {
00795     if (!s->oformat || !s->oformat->get_output_timestamp)
00796         return AVERROR(ENOSYS);
00797     s->oformat->get_output_timestamp(s, stream, dts, wall);
00798     return 0;
00799 }