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 #include "avformat.h"
00022 #include "internal.h"
00023 #include "avi.h"
00024 #include "avio_internal.h"
00025 #include "riff.h"
00026 #include "libavutil/intreadwrite.h"
00027 #include "libavutil/dict.h"
00028 #include "libavutil/avassert.h"
00029 
00030 /*
00031  * TODO:
00032  *  - fill all fields if non streamed (nb_frames for example)
00033  */
00034 
00035 typedef struct AVIIentry {
00036     unsigned int flags, pos, len;
00037 } AVIIentry;
00038 
00039 #define AVI_INDEX_CLUSTER_SIZE 16384
00040 
00041 typedef struct AVIIndex {
00042     int64_t     indx_start;
00043     int         entry;
00044     int         ents_allocated;
00045     AVIIentry** cluster;
00046 } AVIIndex;
00047 
00048 typedef struct {
00049     int64_t riff_start, movi_list, odml_list;
00050     int64_t frames_hdr_all;
00051     int riff_id;
00052 } AVIContext;
00053 
00054 typedef struct  {
00055     int64_t frames_hdr_strm;
00056     int audio_strm_length;
00057     int packet_count;
00058     int entry;
00059 
00060     AVIIndex indexes;
00061 } AVIStream ;
00062 
00063 static inline AVIIentry* avi_get_ientry(AVIIndex* idx, int ent_id)
00064 {
00065     int cl = ent_id / AVI_INDEX_CLUSTER_SIZE;
00066     int id = ent_id % AVI_INDEX_CLUSTER_SIZE;
00067     return &idx->cluster[cl][id];
00068 }
00069 
00070 static int64_t avi_start_new_riff(AVFormatContext *s, AVIOContext *pb,
00071                                   const char* riff_tag, const char* list_tag)
00072 {
00073     AVIContext *avi= s->priv_data;
00074     int64_t loff;
00075     int i;
00076 
00077     avi->riff_id++;
00078     for (i=0; i<s->nb_streams; i++){
00079         AVIStream *avist= s->streams[i]->priv_data;
00080         avist->indexes.entry = 0;
00081     }
00082 
00083     avi->riff_start = ff_start_tag(pb, "RIFF");
00084     ffio_wfourcc(pb, riff_tag);
00085     loff = ff_start_tag(pb, "LIST");
00086     ffio_wfourcc(pb, list_tag);
00087     return loff;
00088 }
00089 
00090 static char* avi_stream2fourcc(char* tag, int index, enum AVMediaType type)
00091 {
00092     tag[0] = '0' + index/10;
00093     tag[1] = '0' + index%10;
00094     if (type == AVMEDIA_TYPE_VIDEO) {
00095         tag[2] = 'd';
00096         tag[3] = 'c';
00097     } else if (type == AVMEDIA_TYPE_SUBTITLE) {
00098         // note: this is not an official code
00099         tag[2] = 's';
00100         tag[3] = 'b';
00101     } else {
00102         tag[2] = 'w';
00103         tag[3] = 'b';
00104     }
00105     tag[4] = '\0';
00106     return tag;
00107 }
00108 
00109 static void avi_write_info_tag(AVIOContext *pb, const char *tag, const char *str)
00110 {
00111     int len = strlen(str);
00112     if (len > 0) {
00113         len++;
00114         ffio_wfourcc(pb, tag);
00115         avio_wl32(pb, len);
00116         avio_put_str(pb, str);
00117         if (len & 1)
00118             avio_w8(pb, 0);
00119     }
00120 }
00121 
00122 static int avi_write_counters(AVFormatContext* s, int riff_id)
00123 {
00124     AVIOContext *pb = s->pb;
00125     AVIContext *avi = s->priv_data;
00126     int n, au_byterate, au_ssize, au_scale, nb_frames = 0;
00127     int64_t file_size;
00128     AVCodecContext* stream;
00129 
00130     file_size = avio_tell(pb);
00131     for(n = 0; n < s->nb_streams; n++) {
00132         AVIStream *avist= s->streams[n]->priv_data;
00133 
00134         av_assert0(avist->frames_hdr_strm);
00135         stream = s->streams[n]->codec;
00136         avio_seek(pb, avist->frames_hdr_strm, SEEK_SET);
00137         ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
00138         if(au_ssize == 0) {
00139             avio_wl32(pb, avist->packet_count);
00140         } else {
00141             avio_wl32(pb, avist->audio_strm_length / au_ssize);
00142         }
00143         if(stream->codec_type == AVMEDIA_TYPE_VIDEO)
00144             nb_frames = FFMAX(nb_frames, avist->packet_count);
00145     }
00146     if(riff_id == 1) {
00147         av_assert0(avi->frames_hdr_all);
00148         avio_seek(pb, avi->frames_hdr_all, SEEK_SET);
00149         avio_wl32(pb, nb_frames);
00150     }
00151     avio_seek(pb, file_size, SEEK_SET);
00152 
00153     return 0;
00154 }
00155 
00156 static int avi_write_header(AVFormatContext *s)
00157 {
00158     AVIContext *avi = s->priv_data;
00159     AVIOContext *pb = s->pb;
00160     int bitrate, n, i, nb_frames, au_byterate, au_ssize, au_scale;
00161     AVCodecContext *stream, *video_enc;
00162     int64_t list1, list2, strh, strf;
00163     AVDictionaryEntry *t = NULL;
00164 
00165     if (s->nb_streams > AVI_MAX_STREAM_COUNT) {
00166         av_log(s, AV_LOG_ERROR, "AVI does not support >%d streams\n",
00167                AVI_MAX_STREAM_COUNT);
00168         return -1;
00169     }
00170 
00171     for(n=0;n<s->nb_streams;n++) {
00172         s->streams[n]->priv_data= av_mallocz(sizeof(AVIStream));
00173         if(!s->streams[n]->priv_data)
00174             return AVERROR(ENOMEM);
00175     }
00176 
00177     /* header list */
00178     avi->riff_id = 0;
00179     list1 = avi_start_new_riff(s, pb, "AVI ", "hdrl");
00180 
00181     /* avi header */
00182     ffio_wfourcc(pb, "avih");
00183     avio_wl32(pb, 14 * 4);
00184     bitrate = 0;
00185 
00186     video_enc = NULL;
00187     for(n=0;n<s->nb_streams;n++) {
00188         stream = s->streams[n]->codec;
00189         bitrate += stream->bit_rate;
00190         if (stream->codec_type == AVMEDIA_TYPE_VIDEO)
00191             video_enc = stream;
00192     }
00193 
00194     nb_frames = 0;
00195 
00196     if(video_enc){
00197         avio_wl32(pb, (uint32_t)(INT64_C(1000000) * video_enc->time_base.num / video_enc->time_base.den));
00198     } else {
00199         avio_wl32(pb, 0);
00200     }
00201     avio_wl32(pb, bitrate / 8); /* XXX: not quite exact */
00202     avio_wl32(pb, 0); /* padding */
00203     if (!pb->seekable)
00204         avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_ISINTERLEAVED); /* flags */
00205     else
00206         avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_HASINDEX | AVIF_ISINTERLEAVED); /* flags */
00207     avi->frames_hdr_all = avio_tell(pb); /* remember this offset to fill later */
00208     avio_wl32(pb, nb_frames); /* nb frames, filled later */
00209     avio_wl32(pb, 0); /* initial frame */
00210     avio_wl32(pb, s->nb_streams); /* nb streams */
00211     avio_wl32(pb, 1024 * 1024); /* suggested buffer size */
00212     if(video_enc){
00213         avio_wl32(pb, video_enc->width);
00214         avio_wl32(pb, video_enc->height);
00215     } else {
00216         avio_wl32(pb, 0);
00217         avio_wl32(pb, 0);
00218     }
00219     avio_wl32(pb, 0); /* reserved */
00220     avio_wl32(pb, 0); /* reserved */
00221     avio_wl32(pb, 0); /* reserved */
00222     avio_wl32(pb, 0); /* reserved */
00223 
00224     /* stream list */
00225     for(i=0;i<n;i++) {
00226         AVIStream *avist= s->streams[i]->priv_data;
00227         list2 = ff_start_tag(pb, "LIST");
00228         ffio_wfourcc(pb, "strl");
00229 
00230         stream = s->streams[i]->codec;
00231 
00232         /* stream generic header */
00233         strh = ff_start_tag(pb, "strh");
00234         switch(stream->codec_type) {
00235         case AVMEDIA_TYPE_SUBTITLE:
00236             // XSUB subtitles behave like video tracks, other subtitles
00237             // are not (yet) supported.
00238             if (stream->codec_id != AV_CODEC_ID_XSUB) {
00239                 av_log(s, AV_LOG_ERROR, "Subtitle streams other than DivX XSUB are not supported by the AVI muxer.\n");
00240                 return AVERROR_PATCHWELCOME;
00241             }
00242         case AVMEDIA_TYPE_VIDEO: ffio_wfourcc(pb, "vids"); break;
00243         case AVMEDIA_TYPE_AUDIO: ffio_wfourcc(pb, "auds"); break;
00244 //      case AVMEDIA_TYPE_TEXT : ffio_wfourcc(pb, "txts"); break;
00245         case AVMEDIA_TYPE_DATA : ffio_wfourcc(pb, "dats"); break;
00246         }
00247         if(stream->codec_type == AVMEDIA_TYPE_VIDEO ||
00248            stream->codec_id == AV_CODEC_ID_XSUB)
00249             avio_wl32(pb, stream->codec_tag);
00250         else
00251             avio_wl32(pb, 1);
00252         avio_wl32(pb, 0); /* flags */
00253         avio_wl16(pb, 0); /* priority */
00254         avio_wl16(pb, 0); /* language */
00255         avio_wl32(pb, 0); /* initial frame */
00256 
00257         ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
00258 
00259         avpriv_set_pts_info(s->streams[i], 64, au_scale, au_byterate);
00260         if(stream->codec_id == AV_CODEC_ID_XSUB)
00261             au_scale = au_byterate = 0;
00262 
00263         avio_wl32(pb, au_scale); /* scale */
00264         avio_wl32(pb, au_byterate); /* rate */
00265 
00266         avio_wl32(pb, 0); /* start */
00267         avist->frames_hdr_strm = avio_tell(pb); /* remember this offset to fill later */
00268         if (!pb->seekable)
00269             avio_wl32(pb, AVI_MAX_RIFF_SIZE); /* FIXME: this may be broken, but who cares */
00270         else
00271             avio_wl32(pb, 0); /* length, XXX: filled later */
00272 
00273         /* suggested buffer size */ //FIXME set at the end to largest chunk
00274         if(stream->codec_type == AVMEDIA_TYPE_VIDEO)
00275             avio_wl32(pb, 1024 * 1024);
00276         else if(stream->codec_type == AVMEDIA_TYPE_AUDIO)
00277             avio_wl32(pb, 12 * 1024);
00278         else
00279             avio_wl32(pb, 0);
00280         avio_wl32(pb, -1); /* quality */
00281         avio_wl32(pb, au_ssize); /* sample size */
00282         avio_wl32(pb, 0);
00283         avio_wl16(pb, stream->width);
00284         avio_wl16(pb, stream->height);
00285         ff_end_tag(pb, strh);
00286 
00287       if(stream->codec_type != AVMEDIA_TYPE_DATA){
00288         strf = ff_start_tag(pb, "strf");
00289         switch(stream->codec_type) {
00290         case AVMEDIA_TYPE_SUBTITLE:
00291             // XSUB subtitles behave like video tracks, other subtitles
00292             // are not (yet) supported.
00293             if (stream->codec_id != AV_CODEC_ID_XSUB) break;
00294         case AVMEDIA_TYPE_VIDEO:
00295             ff_put_bmp_header(pb, stream, ff_codec_bmp_tags, 0);
00296             break;
00297         case AVMEDIA_TYPE_AUDIO:
00298             if (ff_put_wav_header(pb, stream) < 0) {
00299                 return -1;
00300             }
00301             break;
00302         default:
00303             return -1;
00304         }
00305         ff_end_tag(pb, strf);
00306         if ((t = av_dict_get(s->streams[i]->metadata, "title", NULL, 0))) {
00307             avi_write_info_tag(s->pb, "strn", t->value);
00308             t = NULL;
00309         }
00310       }
00311 
00312         if (pb->seekable) {
00313             unsigned char tag[5];
00314             int j;
00315 
00316             /* Starting to lay out AVI OpenDML master index.
00317              * We want to make it JUNK entry for now, since we'd
00318              * like to get away without making AVI an OpenDML one
00319              * for compatibility reasons.
00320              */
00321             avist->indexes.entry = avist->indexes.ents_allocated = 0;
00322             avist->indexes.indx_start = ff_start_tag(pb, "JUNK");
00323             avio_wl16(pb, 4);        /* wLongsPerEntry */
00324             avio_w8(pb, 0);          /* bIndexSubType (0 == frame index) */
00325             avio_w8(pb, 0);          /* bIndexType (0 == AVI_INDEX_OF_INDEXES) */
00326             avio_wl32(pb, 0);        /* nEntriesInUse (will fill out later on) */
00327             ffio_wfourcc(pb, avi_stream2fourcc(tag, i, stream->codec_type));
00328                                     /* dwChunkId */
00329             avio_wl64(pb, 0);        /* dwReserved[3]
00330             avio_wl32(pb, 0);           Must be 0.    */
00331             for (j=0; j < AVI_MASTER_INDEX_SIZE * 2; j++)
00332                  avio_wl64(pb, 0);
00333             ff_end_tag(pb, avist->indexes.indx_start);
00334         }
00335 
00336         if(   stream->codec_type == AVMEDIA_TYPE_VIDEO
00337            && s->streams[i]->sample_aspect_ratio.num>0
00338            && s->streams[i]->sample_aspect_ratio.den>0){
00339             int vprp= ff_start_tag(pb, "vprp");
00340             AVRational dar = av_mul_q(s->streams[i]->sample_aspect_ratio,
00341                                       (AVRational){stream->width, stream->height});
00342             int num, den;
00343             av_reduce(&num, &den, dar.num, dar.den, 0xFFFF);
00344 
00345             avio_wl32(pb, 0); //video format  = unknown
00346             avio_wl32(pb, 0); //video standard= unknown
00347             avio_wl32(pb, lrintf(1.0/av_q2d(stream->time_base)));
00348             avio_wl32(pb, stream->width );
00349             avio_wl32(pb, stream->height);
00350             avio_wl16(pb, den);
00351             avio_wl16(pb, num);
00352             avio_wl32(pb, stream->width );
00353             avio_wl32(pb, stream->height);
00354             avio_wl32(pb, 1); //progressive FIXME
00355 
00356             avio_wl32(pb, stream->height);
00357             avio_wl32(pb, stream->width );
00358             avio_wl32(pb, stream->height);
00359             avio_wl32(pb, stream->width );
00360             avio_wl32(pb, 0);
00361             avio_wl32(pb, 0);
00362 
00363             avio_wl32(pb, 0);
00364             avio_wl32(pb, 0);
00365             ff_end_tag(pb, vprp);
00366         }
00367 
00368         ff_end_tag(pb, list2);
00369     }
00370 
00371     if (pb->seekable) {
00372         /* AVI could become an OpenDML one, if it grows beyond 2Gb range */
00373         avi->odml_list = ff_start_tag(pb, "JUNK");
00374         ffio_wfourcc(pb, "odml");
00375         ffio_wfourcc(pb, "dmlh");
00376         avio_wl32(pb, 248);
00377         for (i = 0; i < 248; i+= 4)
00378              avio_wl32(pb, 0);
00379         ff_end_tag(pb, avi->odml_list);
00380     }
00381 
00382     ff_end_tag(pb, list1);
00383 
00384     list2 = ff_start_tag(pb, "LIST");
00385     ffio_wfourcc(pb, "INFO");
00386     ff_metadata_conv(&s->metadata, ff_riff_info_conv, NULL);
00387     for (i = 0; *ff_riff_tags[i]; i++) {
00388         if ((t = av_dict_get(s->metadata, ff_riff_tags[i], NULL, AV_DICT_MATCH_CASE)))
00389             avi_write_info_tag(s->pb, t->key, t->value);
00390     }
00391     ff_end_tag(pb, list2);
00392 
00393     /* some padding for easier tag editing */
00394     list2 = ff_start_tag(pb, "JUNK");
00395     for (i = 0; i < 1016; i += 4)
00396         avio_wl32(pb, 0);
00397     ff_end_tag(pb, list2);
00398 
00399     avi->movi_list = ff_start_tag(pb, "LIST");
00400     ffio_wfourcc(pb, "movi");
00401 
00402     avio_flush(pb);
00403 
00404     return 0;
00405 }
00406 
00407 static int avi_write_ix(AVFormatContext *s)
00408 {
00409     AVIOContext *pb = s->pb;
00410     AVIContext *avi = s->priv_data;
00411     char tag[5];
00412     char ix_tag[] = "ix00";
00413     int i, j;
00414 
00415     av_assert0(pb->seekable);
00416 
00417     if (avi->riff_id > AVI_MASTER_INDEX_SIZE)
00418         return -1;
00419 
00420     for (i=0;i<s->nb_streams;i++) {
00421         AVIStream *avist= s->streams[i]->priv_data;
00422          int64_t ix, pos;
00423 
00424          avi_stream2fourcc(tag, i, s->streams[i]->codec->codec_type);
00425          ix_tag[3] = '0' + i;
00426 
00427          /* Writing AVI OpenDML leaf index chunk */
00428          ix = avio_tell(pb);
00429          ffio_wfourcc(pb, ix_tag);     /* ix?? */
00430          avio_wl32(pb, avist->indexes.entry * 8 + 24);
00431                                       /* chunk size */
00432          avio_wl16(pb, 2);             /* wLongsPerEntry */
00433          avio_w8(pb, 0);             /* bIndexSubType (0 == frame index) */
00434          avio_w8(pb, 1);             /* bIndexType (1 == AVI_INDEX_OF_CHUNKS) */
00435          avio_wl32(pb, avist->indexes.entry);
00436                                       /* nEntriesInUse */
00437          ffio_wfourcc(pb, tag);        /* dwChunkId */
00438          avio_wl64(pb, avi->movi_list);/* qwBaseOffset */
00439          avio_wl32(pb, 0);             /* dwReserved_3 (must be 0) */
00440 
00441          for (j=0; j<avist->indexes.entry; j++) {
00442              AVIIentry* ie = avi_get_ientry(&avist->indexes, j);
00443              avio_wl32(pb, ie->pos + 8);
00444              avio_wl32(pb, ((uint32_t)ie->len & ~0x80000000) |
00445                           (ie->flags & 0x10 ? 0 : 0x80000000));
00446          }
00447          avio_flush(pb);
00448          pos = avio_tell(pb);
00449 
00450          /* Updating one entry in the AVI OpenDML master index */
00451          avio_seek(pb, avist->indexes.indx_start - 8, SEEK_SET);
00452          ffio_wfourcc(pb, "indx");            /* enabling this entry */
00453          avio_skip(pb, 8);
00454          avio_wl32(pb, avi->riff_id);         /* nEntriesInUse */
00455          avio_skip(pb, 16*avi->riff_id);
00456          avio_wl64(pb, ix);                   /* qwOffset */
00457          avio_wl32(pb, pos - ix);             /* dwSize */
00458          avio_wl32(pb, avist->indexes.entry); /* dwDuration */
00459 
00460          avio_seek(pb, pos, SEEK_SET);
00461     }
00462     return 0;
00463 }
00464 
00465 static int avi_write_idx1(AVFormatContext *s)
00466 {
00467     AVIOContext *pb = s->pb;
00468     AVIContext *avi = s->priv_data;
00469     int64_t idx_chunk;
00470     int i;
00471     char tag[5];
00472 
00473     if (pb->seekable) {
00474         AVIStream *avist;
00475         AVIIentry* ie = 0, *tie;
00476         int empty, stream_id = -1;
00477 
00478         idx_chunk = ff_start_tag(pb, "idx1");
00479         for(i=0; i<s->nb_streams; i++){
00480             avist= s->streams[i]->priv_data;
00481             avist->entry=0;
00482         }
00483 
00484         do {
00485             empty = 1;
00486             for (i=0; i<s->nb_streams; i++) {
00487                 avist= s->streams[i]->priv_data;
00488                  if (avist->indexes.entry <= avist->entry)
00489                      continue;
00490 
00491                  tie = avi_get_ientry(&avist->indexes, avist->entry);
00492                  if (empty || tie->pos < ie->pos) {
00493                      ie = tie;
00494                      stream_id = i;
00495                  }
00496                  empty = 0;
00497             }
00498             if (!empty) {
00499                 avist= s->streams[stream_id]->priv_data;
00500                 avi_stream2fourcc(tag, stream_id,
00501                                   s->streams[stream_id]->codec->codec_type);
00502                 ffio_wfourcc(pb, tag);
00503                 avio_wl32(pb, ie->flags);
00504                 avio_wl32(pb, ie->pos);
00505                 avio_wl32(pb, ie->len);
00506                 avist->entry++;
00507             }
00508         } while (!empty);
00509         ff_end_tag(pb, idx_chunk);
00510 
00511         avi_write_counters(s, avi->riff_id);
00512     }
00513     return 0;
00514 }
00515 
00516 static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
00517 {
00518     AVIContext *avi = s->priv_data;
00519     AVIOContext *pb = s->pb;
00520     unsigned char tag[5];
00521     unsigned int flags=0;
00522     const int stream_index= pkt->stream_index;
00523     AVIStream *avist= s->streams[stream_index]->priv_data;
00524     AVCodecContext *enc= s->streams[stream_index]->codec;
00525     int size= pkt->size;
00526 
00527 //    av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %d\n", pkt->dts, avist->packet_count, stream_index);
00528     while(enc->block_align==0 && pkt->dts != AV_NOPTS_VALUE && pkt->dts > avist->packet_count && enc->codec_id != AV_CODEC_ID_XSUB){
00529         AVPacket empty_packet;
00530 
00531         if(pkt->dts - avist->packet_count > 60000){
00532             av_log(s, AV_LOG_ERROR, "Too large number of skiped frames %"PRId64"\n", pkt->dts - avist->packet_count);
00533             return AVERROR(EINVAL);
00534         }
00535 
00536         av_init_packet(&empty_packet);
00537         empty_packet.size= 0;
00538         empty_packet.data= NULL;
00539         empty_packet.stream_index= stream_index;
00540         avi_write_packet(s, &empty_packet);
00541 //        av_log(s, AV_LOG_DEBUG, "dup %"PRId64" %d\n", pkt->dts, avist->packet_count);
00542     }
00543     avist->packet_count++;
00544 
00545     // Make sure to put an OpenDML chunk when the file size exceeds the limits
00546     if (pb->seekable &&
00547         (avio_tell(pb) - avi->riff_start > AVI_MAX_RIFF_SIZE)) {
00548 
00549         avi_write_ix(s);
00550         ff_end_tag(pb, avi->movi_list);
00551 
00552         if (avi->riff_id == 1)
00553             avi_write_idx1(s);
00554 
00555         ff_end_tag(pb, avi->riff_start);
00556         avi->movi_list = avi_start_new_riff(s, pb, "AVIX", "movi");
00557     }
00558 
00559     avi_stream2fourcc(tag, stream_index, enc->codec_type);
00560     if(pkt->flags&AV_PKT_FLAG_KEY)
00561         flags = 0x10;
00562     if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
00563        avist->audio_strm_length += size;
00564     }
00565 
00566     if (s->pb->seekable) {
00567         AVIIndex* idx = &avist->indexes;
00568         int cl = idx->entry / AVI_INDEX_CLUSTER_SIZE;
00569         int id = idx->entry % AVI_INDEX_CLUSTER_SIZE;
00570         if (idx->ents_allocated <= idx->entry) {
00571             idx->cluster = av_realloc_f(idx->cluster, sizeof(void*), cl+1);
00572             if (!idx->cluster)
00573                 return -1;
00574             idx->cluster[cl] = av_malloc(AVI_INDEX_CLUSTER_SIZE*sizeof(AVIIentry));
00575             if (!idx->cluster[cl])
00576                 return -1;
00577             idx->ents_allocated += AVI_INDEX_CLUSTER_SIZE;
00578         }
00579 
00580         idx->cluster[cl][id].flags = flags;
00581         idx->cluster[cl][id].pos = avio_tell(pb) - avi->movi_list;
00582         idx->cluster[cl][id].len = size;
00583         idx->entry++;
00584     }
00585 
00586     avio_write(pb, tag, 4);
00587     avio_wl32(pb, size);
00588     avio_write(pb, pkt->data, size);
00589     if (size & 1)
00590         avio_w8(pb, 0);
00591 
00592     avio_flush(pb);
00593     return 0;
00594 }
00595 
00596 static int avi_write_trailer(AVFormatContext *s)
00597 {
00598     AVIContext *avi = s->priv_data;
00599     AVIOContext *pb = s->pb;
00600     int res = 0;
00601     int i, j, n, nb_frames;
00602     int64_t file_size;
00603 
00604     if (pb->seekable){
00605         if (avi->riff_id == 1) {
00606             ff_end_tag(pb, avi->movi_list);
00607             res = avi_write_idx1(s);
00608             ff_end_tag(pb, avi->riff_start);
00609         } else {
00610             avi_write_ix(s);
00611             ff_end_tag(pb, avi->movi_list);
00612             ff_end_tag(pb, avi->riff_start);
00613 
00614             file_size = avio_tell(pb);
00615             avio_seek(pb, avi->odml_list - 8, SEEK_SET);
00616             ffio_wfourcc(pb, "LIST"); /* Making this AVI OpenDML one */
00617             avio_skip(pb, 16);
00618 
00619             for (n=nb_frames=0;n<s->nb_streams;n++) {
00620                 AVCodecContext *stream = s->streams[n]->codec;
00621                 AVIStream *avist= s->streams[n]->priv_data;
00622 
00623                 if (stream->codec_type == AVMEDIA_TYPE_VIDEO) {
00624                     if (nb_frames < avist->packet_count)
00625                         nb_frames = avist->packet_count;
00626                 } else {
00627                     if (stream->codec_id == AV_CODEC_ID_MP2 || stream->codec_id == AV_CODEC_ID_MP3) {
00628                         nb_frames += avist->packet_count;
00629                     }
00630                 }
00631             }
00632             avio_wl32(pb, nb_frames);
00633             avio_seek(pb, file_size, SEEK_SET);
00634 
00635             avi_write_counters(s, avi->riff_id);
00636         }
00637     }
00638 
00639     for (i=0; i<s->nb_streams; i++) {
00640          AVIStream *avist= s->streams[i]->priv_data;
00641          for (j=0; j<avist->indexes.ents_allocated/AVI_INDEX_CLUSTER_SIZE; j++)
00642               av_free(avist->indexes.cluster[j]);
00643          av_freep(&avist->indexes.cluster);
00644          avist->indexes.ents_allocated = avist->indexes.entry = 0;
00645     }
00646 
00647     return res;
00648 }
00649 
00650 AVOutputFormat ff_avi_muxer = {
00651     .name              = "avi",
00652     .long_name         = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
00653     .mime_type         = "video/x-msvideo",
00654     .extensions        = "avi",
00655     .priv_data_size    = sizeof(AVIContext),
00656     .audio_codec       = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_AC3,
00657     .video_codec       = AV_CODEC_ID_MPEG4,
00658     .write_header      = avi_write_header,
00659     .write_packet      = avi_write_packet,
00660     .write_trailer     = avi_write_trailer,
00661     .codec_tag         = (const AVCodecTag* const []){
00662         ff_codec_bmp_tags, ff_codec_wav_tags, 0
00663     },
00664     .flags             = AVFMT_VARIABLE_FPS,
00665 };