FFmpeg: libavformat/avienc.c Source File

00001 /*
00002  * AVI muxer
00003  * Copyright (c) 2000 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 "internal.h"
00026 #include "avi.h"
00027 #include "avio_internal.h"
00028 #include "riff.h"
00029 #include "libavutil/intreadwrite.h"
00030 #include "libavutil/dict.h"
00031 #include "libavutil/avassert.h"
00032 #include "libavutil/timestamp.h"
00033 
00034 /*
00035  * TODO:
00036  *  - fill all fields if non streamed (nb_frames for example)
00037  */
00038 
00039 typedef struct AVIIentry {
00040     unsigned int flags, pos, len;
00041 } AVIIentry;
00042 
00043 #define AVI_INDEX_CLUSTER_SIZE 16384
00044 
00045 typedef struct AVIIndex {
00046     int64_t     indx_start;
00047     int         entry;
00048     int         ents_allocated;
00049     AVIIentry** cluster;
00050 } AVIIndex;
00051 
00052 typedef struct {
00053     int64_t riff_start, movi_list, odml_list;
00054     int64_t frames_hdr_all;
00055     int riff_id;
00056 } AVIContext;
00057 
00058 typedef struct  {
00059     int64_t frames_hdr_strm;
00060     int audio_strm_length;
00061     int packet_count;
00062     int entry;
00063 
00064     AVIIndex indexes;
00065 } AVIStream ;
00066 
00067 static inline AVIIentry* avi_get_ientry(AVIIndex* idx, int ent_id)
00068 {
00069     int cl = ent_id / AVI_INDEX_CLUSTER_SIZE;
00070     int id = ent_id % AVI_INDEX_CLUSTER_SIZE;
00071     return &idx->cluster[cl][id];
00072 }
00073 
00074 static int64_t avi_start_new_riff(AVFormatContext *s, AVIOContext *pb,
00075                                   const char* riff_tag, const char* list_tag)
00076 {
00077     AVIContext *avi= s->priv_data;
00078     int64_t loff;
00079     int i;
00080 
00081     avi->riff_id++;
00082     for (i=0; i<s->nb_streams; i++){
00083         AVIStream *avist= s->streams[i]->priv_data;
00084         avist->indexes.entry = 0;
00085     }
00086 
00087     avi->riff_start = ff_start_tag(pb, "RIFF");
00088     ffio_wfourcc(pb, riff_tag);
00089     loff = ff_start_tag(pb, "LIST");
00090     ffio_wfourcc(pb, list_tag);
00091     return loff;
00092 }
00093 
00094 static char* avi_stream2fourcc(char* tag, int index, enum AVMediaType type)
00095 {
00096     tag[0] = '0' + index/10;
00097     tag[1] = '0' + index%10;
00098     if (type == AVMEDIA_TYPE_VIDEO) {
00099         tag[2] = 'd';
00100         tag[3] = 'c';
00101     } else if (type == AVMEDIA_TYPE_SUBTITLE) {
00102         // note: this is not an official code
00103         tag[2] = 's';
00104         tag[3] = 'b';
00105     } else {
00106         tag[2] = 'w';
00107         tag[3] = 'b';
00108     }
00109     tag[4] = '\0';
00110     return tag;
00111 }
00112 
00113 static int avi_write_counters(AVFormatContext* s, int riff_id)
00114 {
00115     AVIOContext *pb = s->pb;
00116     AVIContext *avi = s->priv_data;
00117     int n, au_byterate, au_ssize, au_scale, nb_frames = 0;
00118     int64_t file_size;
00119     AVCodecContext* stream;
00120 
00121     file_size = avio_tell(pb);
00122     for(n = 0; n < s->nb_streams; n++) {
00123         AVIStream *avist= s->streams[n]->priv_data;
00124 
00125         av_assert0(avist->frames_hdr_strm);
00126         stream = s->streams[n]->codec;
00127         avio_seek(pb, avist->frames_hdr_strm, SEEK_SET);
00128         ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
00129         if(au_ssize == 0) {
00130             avio_wl32(pb, avist->packet_count);
00131         } else {
00132             avio_wl32(pb, avist->audio_strm_length / au_ssize);
00133         }
00134         if(stream->codec_type == AVMEDIA_TYPE_VIDEO)
00135             nb_frames = FFMAX(nb_frames, avist->packet_count);
00136     }
00137     if(riff_id == 1) {
00138         av_assert0(avi->frames_hdr_all);
00139         avio_seek(pb, avi->frames_hdr_all, SEEK_SET);
00140         avio_wl32(pb, nb_frames);
00141     }
00142     avio_seek(pb, file_size, SEEK_SET);
00143 
00144     return 0;
00145 }
00146 
00147 static int avi_write_header(AVFormatContext *s)
00148 {
00149     AVIContext *avi = s->priv_data;
00150     AVIOContext *pb = s->pb;
00151     int bitrate, n, i, nb_frames, au_byterate, au_ssize, au_scale;
00152     AVCodecContext *stream, *video_enc;
00153     int64_t list1, list2, strh, strf;
00154     AVDictionaryEntry *t = NULL;
00155 
00156     if (s->nb_streams > AVI_MAX_STREAM_COUNT) {
00157         av_log(s, AV_LOG_ERROR, "AVI does not support >%d streams\n",
00158                AVI_MAX_STREAM_COUNT);
00159         return AVERROR(EINVAL);
00160     }
00161 
00162     for(n=0;n<s->nb_streams;n++) {
00163         s->streams[n]->priv_data= av_mallocz(sizeof(AVIStream));
00164         if(!s->streams[n]->priv_data)
00165             return AVERROR(ENOMEM);
00166     }
00167 
00168     /* header list */
00169     avi->riff_id = 0;
00170     list1 = avi_start_new_riff(s, pb, "AVI ", "hdrl");
00171 
00172     /* avi header */
00173     ffio_wfourcc(pb, "avih");
00174     avio_wl32(pb, 14 * 4);
00175     bitrate = 0;
00176 
00177     video_enc = NULL;
00178     for(n=0;n<s->nb_streams;n++) {
00179         stream = s->streams[n]->codec;
00180         bitrate += stream->bit_rate;
00181         if (stream->codec_type == AVMEDIA_TYPE_VIDEO)
00182             video_enc = stream;
00183     }
00184 
00185     nb_frames = 0;
00186 
00187     if(video_enc){
00188         avio_wl32(pb, (uint32_t)(INT64_C(1000000) * video_enc->time_base.num / video_enc->time_base.den));
00189     } else {
00190         avio_wl32(pb, 0);
00191     }
00192     avio_wl32(pb, bitrate / 8); /* XXX: not quite exact */
00193     avio_wl32(pb, 0); /* padding */
00194     if (!pb->seekable)
00195         avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_ISINTERLEAVED); /* flags */
00196     else
00197         avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_HASINDEX | AVIF_ISINTERLEAVED); /* flags */
00198     avi->frames_hdr_all = avio_tell(pb); /* remember this offset to fill later */
00199     avio_wl32(pb, nb_frames); /* nb frames, filled later */
00200     avio_wl32(pb, 0); /* initial frame */
00201     avio_wl32(pb, s->nb_streams); /* nb streams */
00202     avio_wl32(pb, 1024 * 1024); /* suggested buffer size */
00203     if(video_enc){
00204         avio_wl32(pb, video_enc->width);
00205         avio_wl32(pb, video_enc->height);
00206     } else {
00207         avio_wl32(pb, 0);
00208         avio_wl32(pb, 0);
00209     }
00210     avio_wl32(pb, 0); /* reserved */
00211     avio_wl32(pb, 0); /* reserved */
00212     avio_wl32(pb, 0); /* reserved */
00213     avio_wl32(pb, 0); /* reserved */
00214 
00215     /* stream list */
00216     for(i=0;i<n;i++) {
00217         AVIStream *avist= s->streams[i]->priv_data;
00218         list2 = ff_start_tag(pb, "LIST");
00219         ffio_wfourcc(pb, "strl");
00220 
00221         stream = s->streams[i]->codec;
00222 
00223         /* stream generic header */
00224         strh = ff_start_tag(pb, "strh");
00225         switch(stream->codec_type) {
00226         case AVMEDIA_TYPE_SUBTITLE:
00227             // XSUB subtitles behave like video tracks, other subtitles
00228             // are not (yet) supported.
00229             if (stream->codec_id != AV_CODEC_ID_XSUB) {
00230                 av_log(s, AV_LOG_ERROR, "Subtitle streams other than DivX XSUB are not supported by the AVI muxer.\n");
00231                 return AVERROR_PATCHWELCOME;
00232             }
00233         case AVMEDIA_TYPE_VIDEO: ffio_wfourcc(pb, "vids"); break;
00234         case AVMEDIA_TYPE_AUDIO: ffio_wfourcc(pb, "auds"); break;
00235 //      case AVMEDIA_TYPE_TEXT : ffio_wfourcc(pb, "txts"); break;
00236         case AVMEDIA_TYPE_DATA : ffio_wfourcc(pb, "dats"); break;
00237         }
00238         if(stream->codec_type == AVMEDIA_TYPE_VIDEO ||
00239            stream->codec_id == AV_CODEC_ID_XSUB)
00240             avio_wl32(pb, stream->codec_tag);
00241         else
00242             avio_wl32(pb, 1);
00243         avio_wl32(pb, 0); /* flags */
00244         avio_wl16(pb, 0); /* priority */
00245         avio_wl16(pb, 0); /* language */
00246         avio_wl32(pb, 0); /* initial frame */
00247 
00248         ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
00249 
00250         if (   stream->codec_type == AVMEDIA_TYPE_VIDEO
00251             && stream->codec_id != AV_CODEC_ID_XSUB
00252             && au_byterate > 1000LL*au_scale) {
00253             au_byterate = 600;
00254             au_scale    = 1;
00255         }
00256         avpriv_set_pts_info(s->streams[i], 64, au_scale, au_byterate);
00257         if(stream->codec_id == AV_CODEC_ID_XSUB)
00258             au_scale = au_byterate = 0;
00259 
00260         avio_wl32(pb, au_scale); /* scale */
00261         avio_wl32(pb, au_byterate); /* rate */
00262 
00263         avio_wl32(pb, 0); /* start */
00264         avist->frames_hdr_strm = avio_tell(pb); /* remember this offset to fill later */
00265         if (!pb->seekable)
00266             avio_wl32(pb, AVI_MAX_RIFF_SIZE); /* FIXME: this may be broken, but who cares */
00267         else
00268             avio_wl32(pb, 0); /* length, XXX: filled later */
00269 
00270         /* suggested buffer size */ //FIXME set at the end to largest chunk
00271         if(stream->codec_type == AVMEDIA_TYPE_VIDEO)
00272             avio_wl32(pb, 1024 * 1024);
00273         else if(stream->codec_type == AVMEDIA_TYPE_AUDIO)
00274             avio_wl32(pb, 12 * 1024);
00275         else
00276             avio_wl32(pb, 0);
00277         avio_wl32(pb, -1); /* quality */
00278         avio_wl32(pb, au_ssize); /* sample size */
00279         avio_wl32(pb, 0);
00280         avio_wl16(pb, stream->width);
00281         avio_wl16(pb, stream->height);
00282         ff_end_tag(pb, strh);
00283 
00284       if(stream->codec_type != AVMEDIA_TYPE_DATA){
00285           int ret;
00286 
00287         strf = ff_start_tag(pb, "strf");
00288         switch(stream->codec_type) {
00289         case AVMEDIA_TYPE_SUBTITLE:
00290             // XSUB subtitles behave like video tracks, other subtitles
00291             // are not (yet) supported.
00292             if (stream->codec_id != AV_CODEC_ID_XSUB) break;
00293         case AVMEDIA_TYPE_VIDEO:
00294             ff_put_bmp_header(pb, stream, ff_codec_bmp_tags, 0);
00295             break;
00296         case AVMEDIA_TYPE_AUDIO:
00297             if ((ret = ff_put_wav_header(pb, stream)) < 0) {
00298                 return ret;
00299             }
00300             break;
00301         default:
00302             av_log(s, AV_LOG_ERROR,
00303                    "Invalid or not supported codec type '%s' found in the input\n",
00304                    (char *)av_x_if_null(av_get_media_type_string(stream->codec_type), "?"));
00305             return AVERROR(EINVAL);
00306         }
00307         ff_end_tag(pb, strf);
00308         if ((t = av_dict_get(s->streams[i]->metadata, "title", NULL, 0))) {
00309             ff_riff_write_info_tag(s->pb, "strn", t->value);
00310             t = NULL;
00311         }
00312       }
00313 
00314         if (pb->seekable) {
00315             unsigned char tag[5];
00316             int j;
00317 
00318             /* Starting to lay out AVI OpenDML master index.
00319              * We want to make it JUNK entry for now, since we'd
00320              * like to get away without making AVI an OpenDML one
00321              * for compatibility reasons.
00322              */
00323             avist->indexes.entry = avist->indexes.ents_allocated = 0;
00324             avist->indexes.indx_start = ff_start_tag(pb, "JUNK");
00325             avio_wl16(pb, 4);        /* wLongsPerEntry */
00326             avio_w8(pb, 0);          /* bIndexSubType (0 == frame index) */
00327             avio_w8(pb, 0);          /* bIndexType (0 == AVI_INDEX_OF_INDEXES) */
00328             avio_wl32(pb, 0);        /* nEntriesInUse (will fill out later on) */
00329             ffio_wfourcc(pb, avi_stream2fourcc(tag, i, stream->codec_type));
00330                                     /* dwChunkId */
00331             avio_wl64(pb, 0);        /* dwReserved[3]
00332             avio_wl32(pb, 0);           Must be 0.    */
00333             for (j=0; j < AVI_MASTER_INDEX_SIZE * 2; j++)
00334                  avio_wl64(pb, 0);
00335             ff_end_tag(pb, avist->indexes.indx_start);
00336         }
00337 
00338         if(   stream->codec_type == AVMEDIA_TYPE_VIDEO
00339            && s->streams[i]->sample_aspect_ratio.num>0
00340            && s->streams[i]->sample_aspect_ratio.den>0){
00341             int vprp= ff_start_tag(pb, "vprp");
00342             AVRational dar = av_mul_q(s->streams[i]->sample_aspect_ratio,
00343                                       (AVRational){stream->width, stream->height});
00344             int num, den;
00345             av_reduce(&num, &den, dar.num, dar.den, 0xFFFF);
00346 
00347             avio_wl32(pb, 0); //video format  = unknown
00348             avio_wl32(pb, 0); //video standard= unknown
00349             avio_wl32(pb, lrintf(1.0/av_q2d(stream->time_base)));
00350             avio_wl32(pb, stream->width );
00351             avio_wl32(pb, stream->height);
00352             avio_wl16(pb, den);
00353             avio_wl16(pb, num);
00354             avio_wl32(pb, stream->width );
00355             avio_wl32(pb, stream->height);
00356             avio_wl32(pb, 1); //progressive FIXME
00357 
00358             avio_wl32(pb, stream->height);
00359             avio_wl32(pb, stream->width );
00360             avio_wl32(pb, stream->height);
00361             avio_wl32(pb, stream->width );
00362             avio_wl32(pb, 0);
00363             avio_wl32(pb, 0);
00364 
00365             avio_wl32(pb, 0);
00366             avio_wl32(pb, 0);
00367             ff_end_tag(pb, vprp);
00368         }
00369 
00370         ff_end_tag(pb, list2);
00371     }
00372 
00373     if (pb->seekable) {
00374         /* AVI could become an OpenDML one, if it grows beyond 2Gb range */
00375         avi->odml_list = ff_start_tag(pb, "JUNK");
00376         ffio_wfourcc(pb, "odml");
00377         ffio_wfourcc(pb, "dmlh");
00378         avio_wl32(pb, 248);
00379         for (i = 0; i < 248; i+= 4)
00380              avio_wl32(pb, 0);
00381         ff_end_tag(pb, avi->odml_list);
00382     }
00383 
00384     ff_end_tag(pb, list1);
00385 
00386     ff_riff_write_info(s);
00387 
00388     /* some padding for easier tag editing */
00389     list2 = ff_start_tag(pb, "JUNK");
00390     for (i = 0; i < 1016; i += 4)
00391         avio_wl32(pb, 0);
00392     ff_end_tag(pb, list2);
00393 
00394     avi->movi_list = ff_start_tag(pb, "LIST");
00395     ffio_wfourcc(pb, "movi");
00396 
00397     avio_flush(pb);
00398 
00399     return 0;
00400 }
00401 
00402 static int avi_write_ix(AVFormatContext *s)
00403 {
00404     AVIOContext *pb = s->pb;
00405     AVIContext *avi = s->priv_data;
00406     char tag[5];
00407     char ix_tag[] = "ix00";
00408     int i, j;
00409 
00410     av_assert0(pb->seekable);
00411 
00412     if (avi->riff_id > AVI_MASTER_INDEX_SIZE) {
00413         av_log(s, AV_LOG_ERROR, "Invalid riff index %d > %d\n",
00414                avi->riff_id, AVI_MASTER_INDEX_SIZE);
00415         return AVERROR(EINVAL);
00416     }
00417 
00418     for (i=0;i<s->nb_streams;i++) {
00419         AVIStream *avist= s->streams[i]->priv_data;
00420          int64_t ix, pos;
00421 
00422          avi_stream2fourcc(tag, i, s->streams[i]->codec->codec_type);
00423          ix_tag[3] = '0' + i;
00424 
00425          /* Writing AVI OpenDML leaf index chunk */
00426          ix = avio_tell(pb);
00427          ffio_wfourcc(pb, ix_tag);     /* ix?? */
00428          avio_wl32(pb, avist->indexes.entry * 8 + 24);
00429                                       /* chunk size */
00430          avio_wl16(pb, 2);             /* wLongsPerEntry */
00431          avio_w8(pb, 0);             /* bIndexSubType (0 == frame index) */
00432          avio_w8(pb, 1);             /* bIndexType (1 == AVI_INDEX_OF_CHUNKS) */
00433          avio_wl32(pb, avist->indexes.entry);
00434                                       /* nEntriesInUse */
00435          ffio_wfourcc(pb, tag);        /* dwChunkId */
00436          avio_wl64(pb, avi->movi_list);/* qwBaseOffset */
00437          avio_wl32(pb, 0);             /* dwReserved_3 (must be 0) */
00438 
00439          for (j=0; j<avist->indexes.entry; j++) {
00440              AVIIentry* ie = avi_get_ientry(&avist->indexes, j);
00441              avio_wl32(pb, ie->pos + 8);
00442              avio_wl32(pb, ((uint32_t)ie->len & ~0x80000000) |
00443                           (ie->flags & 0x10 ? 0 : 0x80000000));
00444          }
00445          avio_flush(pb);
00446          pos = avio_tell(pb);
00447 
00448          /* Updating one entry in the AVI OpenDML master index */
00449          avio_seek(pb, avist->indexes.indx_start - 8, SEEK_SET);
00450          ffio_wfourcc(pb, "indx");            /* enabling this entry */
00451          avio_skip(pb, 8);
00452          avio_wl32(pb, avi->riff_id);         /* nEntriesInUse */
00453          avio_skip(pb, 16*avi->riff_id);
00454          avio_wl64(pb, ix);                   /* qwOffset */
00455          avio_wl32(pb, pos - ix);             /* dwSize */
00456          avio_wl32(pb, avist->indexes.entry); /* dwDuration */
00457 
00458          avio_seek(pb, pos, SEEK_SET);
00459     }
00460     return 0;
00461 }
00462 
00463 static int avi_write_idx1(AVFormatContext *s)
00464 {
00465     AVIOContext *pb = s->pb;
00466     AVIContext *avi = s->priv_data;
00467     int64_t idx_chunk;
00468     int i;
00469     char tag[5];
00470 
00471     if (pb->seekable) {
00472         AVIStream *avist;
00473         AVIIentry* ie = 0, *tie;
00474         int empty, stream_id = -1;
00475 
00476         idx_chunk = ff_start_tag(pb, "idx1");
00477         for(i=0; i<s->nb_streams; i++){
00478             avist= s->streams[i]->priv_data;
00479             avist->entry=0;
00480         }
00481 
00482         do {
00483             empty = 1;
00484             for (i=0; i<s->nb_streams; i++) {
00485                 avist= s->streams[i]->priv_data;
00486                  if (avist->indexes.entry <= avist->entry)
00487                      continue;
00488 
00489                  tie = avi_get_ientry(&avist->indexes, avist->entry);
00490                  if (empty || tie->pos < ie->pos) {
00491                      ie = tie;
00492                      stream_id = i;
00493                  }
00494                  empty = 0;
00495             }
00496             if (!empty) {
00497                 avist= s->streams[stream_id]->priv_data;
00498                 avi_stream2fourcc(tag, stream_id,
00499                                   s->streams[stream_id]->codec->codec_type);
00500                 ffio_wfourcc(pb, tag);
00501                 avio_wl32(pb, ie->flags);
00502                 avio_wl32(pb, ie->pos);
00503                 avio_wl32(pb, ie->len);
00504                 avist->entry++;
00505             }
00506         } while (!empty);
00507         ff_end_tag(pb, idx_chunk);
00508 
00509         avi_write_counters(s, avi->riff_id);
00510     }
00511     return 0;
00512 }
00513 
00514 static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
00515 {
00516     AVIContext *avi = s->priv_data;
00517     AVIOContext *pb = s->pb;
00518     unsigned char tag[5];
00519     unsigned int flags=0;
00520     const int stream_index= pkt->stream_index;
00521     AVIStream *avist= s->streams[stream_index]->priv_data;
00522     AVCodecContext *enc= s->streams[stream_index]->codec;
00523     int size= pkt->size;
00524 
00525     av_dlog(s, "dts:%s packet_count:%d stream_index:%d\n", av_ts2str(pkt->dts), avist->packet_count, stream_index);
00526     while(enc->block_align==0 && pkt->dts != AV_NOPTS_VALUE && pkt->dts > avist->packet_count && enc->codec_id != AV_CODEC_ID_XSUB){
00527         AVPacket empty_packet;
00528 
00529         if(pkt->dts - avist->packet_count > 60000){
00530             av_log(s, AV_LOG_ERROR, "Too large number of skipped frames %"PRId64" > 60000\n", pkt->dts - avist->packet_count);
00531             return AVERROR(EINVAL);
00532         }
00533 
00534         av_init_packet(&empty_packet);
00535         empty_packet.size= 0;
00536         empty_packet.data= NULL;
00537         empty_packet.stream_index= stream_index;
00538         avi_write_packet(s, &empty_packet);
00539         av_dlog(s, "dup dts:%s packet_count:%d\n", av_ts2str(pkt->dts), avist->packet_count);
00540     }
00541     avist->packet_count++;
00542 
00543     // Make sure to put an OpenDML chunk when the file size exceeds the limits
00544     if (pb->seekable &&
00545         (avio_tell(pb) - avi->riff_start > AVI_MAX_RIFF_SIZE)) {
00546 
00547         avi_write_ix(s);
00548         ff_end_tag(pb, avi->movi_list);
00549 
00550         if (avi->riff_id == 1)
00551             avi_write_idx1(s);
00552 
00553         ff_end_tag(pb, avi->riff_start);
00554         avi->movi_list = avi_start_new_riff(s, pb, "AVIX", "movi");
00555     }
00556 
00557     avi_stream2fourcc(tag, stream_index, enc->codec_type);
00558     if(pkt->flags&AV_PKT_FLAG_KEY)
00559         flags = 0x10;
00560     if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
00561        avist->audio_strm_length += size;
00562     }
00563 
00564     if (s->pb->seekable) {
00565         AVIIndex* idx = &avist->indexes;
00566         int cl = idx->entry / AVI_INDEX_CLUSTER_SIZE;
00567         int id = idx->entry % AVI_INDEX_CLUSTER_SIZE;
00568         if (idx->ents_allocated <= idx->entry) {
00569             idx->cluster = av_realloc_f(idx->cluster, sizeof(void*), cl+1);
00570             if (!idx->cluster)
00571                 return AVERROR(ENOMEM);
00572             idx->cluster[cl] = av_malloc(AVI_INDEX_CLUSTER_SIZE*sizeof(AVIIentry));
00573             if (!idx->cluster[cl])
00574                 return AVERROR(ENOMEM);
00575             idx->ents_allocated += AVI_INDEX_CLUSTER_SIZE;
00576         }
00577 
00578         idx->cluster[cl][id].flags = flags;
00579         idx->cluster[cl][id].pos = avio_tell(pb) - avi->movi_list;
00580         idx->cluster[cl][id].len = size;
00581         idx->entry++;
00582     }
00583 
00584     avio_write(pb, tag, 4);
00585     avio_wl32(pb, size);
00586     avio_write(pb, pkt->data, size);
00587     if (size & 1)
00588         avio_w8(pb, 0);
00589 
00590     avio_flush(pb);
00591     return 0;
00592 }
00593 
00594 static int avi_write_trailer(AVFormatContext *s)
00595 {
00596     AVIContext *avi = s->priv_data;
00597     AVIOContext *pb = s->pb;
00598     int res = 0;
00599     int i, j, n, nb_frames;
00600     int64_t file_size;
00601 
00602     if (pb->seekable){
00603         if (avi->riff_id == 1) {
00604             ff_end_tag(pb, avi->movi_list);
00605             res = avi_write_idx1(s);
00606             ff_end_tag(pb, avi->riff_start);
00607         } else {
00608             avi_write_ix(s);
00609             ff_end_tag(pb, avi->movi_list);
00610             ff_end_tag(pb, avi->riff_start);
00611 
00612             file_size = avio_tell(pb);
00613             avio_seek(pb, avi->odml_list - 8, SEEK_SET);
00614             ffio_wfourcc(pb, "LIST"); /* Making this AVI OpenDML one */
00615             avio_skip(pb, 16);
00616 
00617             for (n=nb_frames=0;n<s->nb_streams;n++) {
00618                 AVCodecContext *stream = s->streams[n]->codec;
00619                 AVIStream *avist= s->streams[n]->priv_data;
00620 
00621                 if (stream->codec_type == AVMEDIA_TYPE_VIDEO) {
00622                     if (nb_frames < avist->packet_count)
00623                         nb_frames = avist->packet_count;
00624                 } else {
00625                     if (stream->codec_id == AV_CODEC_ID_MP2 || stream->codec_id == AV_CODEC_ID_MP3) {
00626                         nb_frames += avist->packet_count;
00627                     }
00628                 }
00629             }
00630             avio_wl32(pb, nb_frames);
00631             avio_seek(pb, file_size, SEEK_SET);
00632 
00633             avi_write_counters(s, avi->riff_id);
00634         }
00635     }
00636 
00637     for (i=0; i<s->nb_streams; i++) {
00638          AVIStream *avist= s->streams[i]->priv_data;
00639          for (j=0; j<avist->indexes.ents_allocated/AVI_INDEX_CLUSTER_SIZE; j++)
00640               av_free(avist->indexes.cluster[j]);
00641          av_freep(&avist->indexes.cluster);
00642          avist->indexes.ents_allocated = avist->indexes.entry = 0;
00643     }
00644 
00645     return res;
00646 }
00647 
00648 AVOutputFormat ff_avi_muxer = {
00649     .name              = "avi",
00650     .long_name         = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
00651     .mime_type         = "video/x-msvideo",
00652     .extensions        = "avi",
00653     .priv_data_size    = sizeof(AVIContext),
00654     .audio_codec       = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_AC3,
00655     .video_codec       = AV_CODEC_ID_MPEG4,
00656     .write_header      = avi_write_header,
00657     .write_packet      = avi_write_packet,
00658     .write_trailer     = avi_write_trailer,
00659     .codec_tag         = (const AVCodecTag* const []){
00660         ff_codec_bmp_tags, ff_codec_wav_tags, 0
00661     },
00662     .flags             = AVFMT_VARIABLE_FPS,
00663 };