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 
00029 /*
00030  * TODO:
00031  *  - fill all fields if non streamed (nb_frames for example)
00032  */
00033 
00034 typedef struct AVIIentry {
00035     unsigned int flags, pos, len;
00036 } AVIIentry;
00037 
00038 #define AVI_INDEX_CLUSTER_SIZE 16384
00039 
00040 typedef struct AVIIndex {
00041     int64_t     indx_start;
00042     int         entry;
00043     int         ents_allocated;
00044     AVIIentry** cluster;
00045 } AVIIndex;
00046 
00047 typedef struct {
00048     int64_t riff_start, movi_list, odml_list;
00049     int64_t frames_hdr_all;
00050     int riff_id;
00051 } AVIContext;
00052 
00053 typedef struct  {
00054     int64_t frames_hdr_strm;
00055     int audio_strm_length;
00056     int packet_count;
00057     int entry;
00058 
00059     AVIIndex indexes;
00060 } AVIStream ;
00061 
00062 static inline AVIIentry* avi_get_ientry(AVIIndex* idx, int ent_id)
00063 {
00064     int cl = ent_id / AVI_INDEX_CLUSTER_SIZE;
00065     int id = ent_id % AVI_INDEX_CLUSTER_SIZE;
00066     return &idx->cluster[cl][id];
00067 }
00068 
00069 static int64_t avi_start_new_riff(AVFormatContext *s, AVIOContext *pb,
00070                                   const char* riff_tag, const char* list_tag)
00071 {
00072     AVIContext *avi= s->priv_data;
00073     int64_t loff;
00074     int i;
00075 
00076     avi->riff_id++;
00077     for (i=0; i<s->nb_streams; i++){
00078         AVIStream *avist= s->streams[i]->priv_data;
00079         avist->indexes.entry = 0;
00080     }
00081 
00082     avi->riff_start = ff_start_tag(pb, "RIFF");
00083     ffio_wfourcc(pb, riff_tag);
00084     loff = ff_start_tag(pb, "LIST");
00085     ffio_wfourcc(pb, list_tag);
00086     return loff;
00087 }
00088 
00089 static char* avi_stream2fourcc(char* tag, int index, enum AVMediaType type)
00090 {
00091     tag[0] = '0' + index/10;
00092     tag[1] = '0' + index%10;
00093     if (type == AVMEDIA_TYPE_VIDEO) {
00094         tag[2] = 'd';
00095         tag[3] = 'c';
00096     } else if (type == AVMEDIA_TYPE_SUBTITLE) {
00097         // note: this is not an official code
00098         tag[2] = 's';
00099         tag[3] = 'b';
00100     } else {
00101         tag[2] = 'w';
00102         tag[3] = 'b';
00103     }
00104     tag[4] = '\0';
00105     return tag;
00106 }
00107 
00108 static void avi_write_info_tag(AVIOContext *pb, const char *tag, const char *str)
00109 {
00110     int len = strlen(str);
00111     if (len > 0) {
00112         len++;
00113         ffio_wfourcc(pb, tag);
00114         avio_wl32(pb, len);
00115         avio_put_str(pb, str);
00116         if (len & 1)
00117             avio_w8(pb, 0);
00118     }
00119 }
00120 
00121 static int avi_write_counters(AVFormatContext* s, int riff_id)
00122 {
00123     AVIOContext *pb = s->pb;
00124     AVIContext *avi = s->priv_data;
00125     int n, au_byterate, au_ssize, au_scale, nb_frames = 0;
00126     int64_t file_size;
00127     AVCodecContext* stream;
00128 
00129     file_size = avio_tell(pb);
00130     for(n = 0; n < s->nb_streams; n++) {
00131         AVIStream *avist= s->streams[n]->priv_data;
00132 
00133         assert(avist->frames_hdr_strm);
00134         stream = s->streams[n]->codec;
00135         avio_seek(pb, avist->frames_hdr_strm, SEEK_SET);
00136         ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
00137         if(au_ssize == 0) {
00138             avio_wl32(pb, avist->packet_count);
00139         } else {
00140             avio_wl32(pb, avist->audio_strm_length / au_ssize);
00141         }
00142         if(stream->codec_type == AVMEDIA_TYPE_VIDEO)
00143             nb_frames = FFMAX(nb_frames, avist->packet_count);
00144     }
00145     if(riff_id == 1) {
00146         assert(avi->frames_hdr_all);
00147         avio_seek(pb, avi->frames_hdr_all, SEEK_SET);
00148         avio_wl32(pb, nb_frames);
00149     }
00150     avio_seek(pb, file_size, SEEK_SET);
00151 
00152     return 0;
00153 }
00154 
00155 static int avi_write_header(AVFormatContext *s)
00156 {
00157     AVIContext *avi = s->priv_data;
00158     AVIOContext *pb = s->pb;
00159     int bitrate, n, i, nb_frames, au_byterate, au_ssize, au_scale;
00160     AVCodecContext *stream, *video_enc;
00161     int64_t list1, list2, strh, strf;
00162     AVDictionaryEntry *t = NULL;
00163 
00164     if (s->nb_streams > AVI_MAX_STREAM_COUNT) {
00165         av_log(s, AV_LOG_ERROR, "AVI does not support >%d streams\n",
00166                AVI_MAX_STREAM_COUNT);
00167         return -1;
00168     }
00169 
00170     for(n=0;n<s->nb_streams;n++) {
00171         s->streams[n]->priv_data= av_mallocz(sizeof(AVIStream));
00172         if(!s->streams[n]->priv_data)
00173             return AVERROR(ENOMEM);
00174     }
00175 
00176     /* header list */
00177     avi->riff_id = 0;
00178     list1 = avi_start_new_riff(s, pb, "AVI ", "hdrl");
00179 
00180     /* avi header */
00181     ffio_wfourcc(pb, "avih");
00182     avio_wl32(pb, 14 * 4);
00183     bitrate = 0;
00184 
00185     video_enc = NULL;
00186     for(n=0;n<s->nb_streams;n++) {
00187         stream = s->streams[n]->codec;
00188         bitrate += stream->bit_rate;
00189         if (stream->codec_type == AVMEDIA_TYPE_VIDEO)
00190             video_enc = stream;
00191     }
00192 
00193     nb_frames = 0;
00194 
00195     if(video_enc){
00196         avio_wl32(pb, (uint32_t)(INT64_C(1000000) * video_enc->time_base.num / video_enc->time_base.den));
00197     } else {
00198         avio_wl32(pb, 0);
00199     }
00200     avio_wl32(pb, bitrate / 8); /* XXX: not quite exact */
00201     avio_wl32(pb, 0); /* padding */
00202     if (!pb->seekable)
00203         avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_ISINTERLEAVED); /* flags */
00204     else
00205         avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_HASINDEX | AVIF_ISINTERLEAVED); /* flags */
00206     avi->frames_hdr_all = avio_tell(pb); /* remember this offset to fill later */
00207     avio_wl32(pb, nb_frames); /* nb frames, filled later */
00208     avio_wl32(pb, 0); /* initial frame */
00209     avio_wl32(pb, s->nb_streams); /* nb streams */
00210     avio_wl32(pb, 1024 * 1024); /* suggested buffer size */
00211     if(video_enc){
00212         avio_wl32(pb, video_enc->width);
00213         avio_wl32(pb, video_enc->height);
00214     } else {
00215         avio_wl32(pb, 0);
00216         avio_wl32(pb, 0);
00217     }
00218     avio_wl32(pb, 0); /* reserved */
00219     avio_wl32(pb, 0); /* reserved */
00220     avio_wl32(pb, 0); /* reserved */
00221     avio_wl32(pb, 0); /* reserved */
00222 
00223     /* stream list */
00224     for(i=0;i<n;i++) {
00225         AVIStream *avist= s->streams[i]->priv_data;
00226         list2 = ff_start_tag(pb, "LIST");
00227         ffio_wfourcc(pb, "strl");
00228 
00229         stream = s->streams[i]->codec;
00230 
00231         /* stream generic header */
00232         strh = ff_start_tag(pb, "strh");
00233         switch(stream->codec_type) {
00234         case AVMEDIA_TYPE_SUBTITLE:
00235             // XSUB subtitles behave like video tracks, other subtitles
00236             // are not (yet) supported.
00237             if (stream->codec_id != CODEC_ID_XSUB) {
00238                 av_log(s, AV_LOG_ERROR, "Subtitle streams other than DivX XSUB are not supported by the AVI muxer.\n");
00239                 return AVERROR_PATCHWELCOME;
00240             }
00241         case AVMEDIA_TYPE_VIDEO: ffio_wfourcc(pb, "vids"); break;
00242         case AVMEDIA_TYPE_AUDIO: ffio_wfourcc(pb, "auds"); break;
00243 //      case AVMEDIA_TYPE_TEXT : ffio_wfourcc(pb, "txts"); break;
00244         case AVMEDIA_TYPE_DATA : ffio_wfourcc(pb, "dats"); break;
00245         }
00246         if(stream->codec_type == AVMEDIA_TYPE_VIDEO ||
00247            stream->codec_id == CODEC_ID_XSUB)
00248             avio_wl32(pb, stream->codec_tag);
00249         else
00250             avio_wl32(pb, 1);
00251         avio_wl32(pb, 0); /* flags */
00252         avio_wl16(pb, 0); /* priority */
00253         avio_wl16(pb, 0); /* language */
00254         avio_wl32(pb, 0); /* initial frame */
00255 
00256         ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
00257 
00258         avpriv_set_pts_info(s->streams[i], 64, au_scale, au_byterate);
00259         if(stream->codec_id == CODEC_ID_XSUB)
00260             au_scale = au_byterate = 0;
00261 
00262         avio_wl32(pb, au_scale); /* scale */
00263         avio_wl32(pb, au_byterate); /* rate */
00264 
00265         avio_wl32(pb, 0); /* start */
00266         avist->frames_hdr_strm = avio_tell(pb); /* remember this offset to fill later */
00267         if (!pb->seekable)
00268             avio_wl32(pb, AVI_MAX_RIFF_SIZE); /* FIXME: this may be broken, but who cares */
00269         else
00270             avio_wl32(pb, 0); /* length, XXX: filled later */
00271 
00272         /* suggested buffer size */ //FIXME set at the end to largest chunk
00273         if(stream->codec_type == AVMEDIA_TYPE_VIDEO)
00274             avio_wl32(pb, 1024 * 1024);
00275         else if(stream->codec_type == AVMEDIA_TYPE_AUDIO)
00276             avio_wl32(pb, 12 * 1024);
00277         else
00278             avio_wl32(pb, 0);
00279         avio_wl32(pb, -1); /* quality */
00280         avio_wl32(pb, au_ssize); /* sample size */
00281         avio_wl32(pb, 0);
00282         avio_wl16(pb, stream->width);
00283         avio_wl16(pb, stream->height);
00284         ff_end_tag(pb, strh);
00285 
00286       if(stream->codec_type != AVMEDIA_TYPE_DATA){
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 != 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 (ff_put_wav_header(pb, stream) < 0) {
00298                 return -1;
00299             }
00300             break;
00301         default:
00302             return -1;
00303         }
00304         ff_end_tag(pb, strf);
00305         if ((t = av_dict_get(s->streams[i]->metadata, "title", NULL, 0))) {
00306             avi_write_info_tag(s->pb, "strn", t->value);
00307             t = NULL;
00308         }
00309       }
00310 
00311         if (pb->seekable) {
00312             unsigned char tag[5];
00313             int j;
00314 
00315             /* Starting to lay out AVI OpenDML master index.
00316              * We want to make it JUNK entry for now, since we'd
00317              * like to get away without making AVI an OpenDML one
00318              * for compatibility reasons.
00319              */
00320             avist->indexes.entry = avist->indexes.ents_allocated = 0;
00321             avist->indexes.indx_start = ff_start_tag(pb, "JUNK");
00322             avio_wl16(pb, 4);        /* wLongsPerEntry */
00323             avio_w8(pb, 0);          /* bIndexSubType (0 == frame index) */
00324             avio_w8(pb, 0);          /* bIndexType (0 == AVI_INDEX_OF_INDEXES) */
00325             avio_wl32(pb, 0);        /* nEntriesInUse (will fill out later on) */
00326             ffio_wfourcc(pb, avi_stream2fourcc(tag, i, stream->codec_type));
00327                                     /* dwChunkId */
00328             avio_wl64(pb, 0);        /* dwReserved[3]
00329             avio_wl32(pb, 0);           Must be 0.    */
00330             for (j=0; j < AVI_MASTER_INDEX_SIZE * 2; j++)
00331                  avio_wl64(pb, 0);
00332             ff_end_tag(pb, avist->indexes.indx_start);
00333         }
00334 
00335         if(   stream->codec_type == AVMEDIA_TYPE_VIDEO
00336            && s->streams[i]->sample_aspect_ratio.num>0
00337            && s->streams[i]->sample_aspect_ratio.den>0){
00338             int vprp= ff_start_tag(pb, "vprp");
00339             AVRational dar = av_mul_q(s->streams[i]->sample_aspect_ratio,
00340                                       (AVRational){stream->width, stream->height});
00341             int num, den;
00342             av_reduce(&num, &den, dar.num, dar.den, 0xFFFF);
00343 
00344             avio_wl32(pb, 0); //video format  = unknown
00345             avio_wl32(pb, 0); //video standard= unknown
00346             avio_wl32(pb, lrintf(1.0/av_q2d(stream->time_base)));
00347             avio_wl32(pb, stream->width );
00348             avio_wl32(pb, stream->height);
00349             avio_wl16(pb, den);
00350             avio_wl16(pb, num);
00351             avio_wl32(pb, stream->width );
00352             avio_wl32(pb, stream->height);
00353             avio_wl32(pb, 1); //progressive FIXME
00354 
00355             avio_wl32(pb, stream->height);
00356             avio_wl32(pb, stream->width );
00357             avio_wl32(pb, stream->height);
00358             avio_wl32(pb, stream->width );
00359             avio_wl32(pb, 0);
00360             avio_wl32(pb, 0);
00361 
00362             avio_wl32(pb, 0);
00363             avio_wl32(pb, 0);
00364             ff_end_tag(pb, vprp);
00365         }
00366 
00367         ff_end_tag(pb, list2);
00368     }
00369 
00370     if (pb->seekable) {
00371         /* AVI could become an OpenDML one, if it grows beyond 2Gb range */
00372         avi->odml_list = ff_start_tag(pb, "JUNK");
00373         ffio_wfourcc(pb, "odml");
00374         ffio_wfourcc(pb, "dmlh");
00375         avio_wl32(pb, 248);
00376         for (i = 0; i < 248; i+= 4)
00377              avio_wl32(pb, 0);
00378         ff_end_tag(pb, avi->odml_list);
00379     }
00380 
00381     ff_end_tag(pb, list1);
00382 
00383     list2 = ff_start_tag(pb, "LIST");
00384     ffio_wfourcc(pb, "INFO");
00385     ff_metadata_conv(&s->metadata, ff_riff_info_conv, NULL);
00386     for (i = 0; *ff_riff_tags[i]; i++) {
00387         if ((t = av_dict_get(s->metadata, ff_riff_tags[i], NULL, AV_DICT_MATCH_CASE)))
00388             avi_write_info_tag(s->pb, t->key, t->value);
00389     }
00390     ff_end_tag(pb, list2);
00391 
00392     /* some padding for easier tag editing */
00393     list2 = ff_start_tag(pb, "JUNK");
00394     for (i = 0; i < 1016; i += 4)
00395         avio_wl32(pb, 0);
00396     ff_end_tag(pb, list2);
00397 
00398     avi->movi_list = ff_start_tag(pb, "LIST");
00399     ffio_wfourcc(pb, "movi");
00400 
00401     avio_flush(pb);
00402 
00403     return 0;
00404 }
00405 
00406 static int avi_write_ix(AVFormatContext *s)
00407 {
00408     AVIOContext *pb = s->pb;
00409     AVIContext *avi = s->priv_data;
00410     char tag[5];
00411     char ix_tag[] = "ix00";
00412     int i, j;
00413 
00414     assert(pb->seekable);
00415 
00416     if (avi->riff_id > AVI_MASTER_INDEX_SIZE)
00417         return -1;
00418 
00419     for (i=0;i<s->nb_streams;i++) {
00420         AVIStream *avist= s->streams[i]->priv_data;
00421          int64_t ix, pos;
00422 
00423          avi_stream2fourcc(tag, i, s->streams[i]->codec->codec_type);
00424          ix_tag[3] = '0' + i;
00425 
00426          /* Writing AVI OpenDML leaf index chunk */
00427          ix = avio_tell(pb);
00428          ffio_wfourcc(pb, ix_tag);     /* ix?? */
00429          avio_wl32(pb, avist->indexes.entry * 8 + 24);
00430                                       /* chunk size */
00431          avio_wl16(pb, 2);             /* wLongsPerEntry */
00432          avio_w8(pb, 0);             /* bIndexSubType (0 == frame index) */
00433          avio_w8(pb, 1);             /* bIndexType (1 == AVI_INDEX_OF_CHUNKS) */
00434          avio_wl32(pb, avist->indexes.entry);
00435                                       /* nEntriesInUse */
00436          ffio_wfourcc(pb, tag);        /* dwChunkId */
00437          avio_wl64(pb, avi->movi_list);/* qwBaseOffset */
00438          avio_wl32(pb, 0);             /* dwReserved_3 (must be 0) */
00439 
00440          for (j=0; j<avist->indexes.entry; j++) {
00441              AVIIentry* ie = avi_get_ientry(&avist->indexes, j);
00442              avio_wl32(pb, ie->pos + 8);
00443              avio_wl32(pb, ((uint32_t)ie->len & ~0x80000000) |
00444                           (ie->flags & 0x10 ? 0 : 0x80000000));
00445          }
00446          avio_flush(pb);
00447          pos = avio_tell(pb);
00448 
00449          /* Updating one entry in the AVI OpenDML master index */
00450          avio_seek(pb, avist->indexes.indx_start - 8, SEEK_SET);
00451          ffio_wfourcc(pb, "indx");            /* enabling this entry */
00452          avio_skip(pb, 8);
00453          avio_wl32(pb, avi->riff_id);         /* nEntriesInUse */
00454          avio_skip(pb, 16*avi->riff_id);
00455          avio_wl64(pb, ix);                   /* qwOffset */
00456          avio_wl32(pb, pos - ix);             /* dwSize */
00457          avio_wl32(pb, avist->indexes.entry); /* dwDuration */
00458 
00459          avio_seek(pb, pos, SEEK_SET);
00460     }
00461     return 0;
00462 }
00463 
00464 static int avi_write_idx1(AVFormatContext *s)
00465 {
00466     AVIOContext *pb = s->pb;
00467     AVIContext *avi = s->priv_data;
00468     int64_t idx_chunk;
00469     int i;
00470     char tag[5];
00471 
00472     if (pb->seekable) {
00473         AVIStream *avist;
00474         AVIIentry* ie = 0, *tie;
00475         int empty, stream_id = -1;
00476 
00477         idx_chunk = ff_start_tag(pb, "idx1");
00478         for(i=0; i<s->nb_streams; i++){
00479             avist= s->streams[i]->priv_data;
00480             avist->entry=0;
00481         }
00482 
00483         do {
00484             empty = 1;
00485             for (i=0; i<s->nb_streams; i++) {
00486                 avist= s->streams[i]->priv_data;
00487                  if (avist->indexes.entry <= avist->entry)
00488                      continue;
00489 
00490                  tie = avi_get_ientry(&avist->indexes, avist->entry);
00491                  if (empty || tie->pos < ie->pos) {
00492                      ie = tie;
00493                      stream_id = i;
00494                  }
00495                  empty = 0;
00496             }
00497             if (!empty) {
00498                 avist= s->streams[stream_id]->priv_data;
00499                 avi_stream2fourcc(tag, stream_id,
00500                                   s->streams[stream_id]->codec->codec_type);
00501                 ffio_wfourcc(pb, tag);
00502                 avio_wl32(pb, ie->flags);
00503                 avio_wl32(pb, ie->pos);
00504                 avio_wl32(pb, ie->len);
00505                 avist->entry++;
00506             }
00507         } while (!empty);
00508         ff_end_tag(pb, idx_chunk);
00509 
00510         avi_write_counters(s, avi->riff_id);
00511     }
00512     return 0;
00513 }
00514 
00515 static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
00516 {
00517     AVIContext *avi = s->priv_data;
00518     AVIOContext *pb = s->pb;
00519     unsigned char tag[5];
00520     unsigned int flags=0;
00521     const int stream_index= pkt->stream_index;
00522     AVIStream *avist= s->streams[stream_index]->priv_data;
00523     AVCodecContext *enc= s->streams[stream_index]->codec;
00524     int size= pkt->size;
00525 
00526 //    av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %d\n", pkt->dts, avist->packet_count, stream_index);
00527     while(enc->block_align==0 && pkt->dts != AV_NOPTS_VALUE && pkt->dts > avist->packet_count && enc->codec_id != CODEC_ID_XSUB){
00528         AVPacket empty_packet;
00529 
00530         if(pkt->dts - avist->packet_count > 60000){
00531             av_log(s, AV_LOG_ERROR, "Too large number of skiped frames %"PRId64"\n", pkt->dts - avist->packet_count);
00532             return AVERROR(EINVAL);
00533         }
00534 
00535         av_init_packet(&empty_packet);
00536         empty_packet.size= 0;
00537         empty_packet.data= NULL;
00538         empty_packet.stream_index= stream_index;
00539         avi_write_packet(s, &empty_packet);
00540 //        av_log(s, AV_LOG_DEBUG, "dup %"PRId64" %d\n", pkt->dts, avist->packet_count);
00541     }
00542     avist->packet_count++;
00543 
00544     // Make sure to put an OpenDML chunk when the file size exceeds the limits
00545     if (pb->seekable &&
00546         (avio_tell(pb) - avi->riff_start > AVI_MAX_RIFF_SIZE)) {
00547 
00548         avi_write_ix(s);
00549         ff_end_tag(pb, avi->movi_list);
00550 
00551         if (avi->riff_id == 1)
00552             avi_write_idx1(s);
00553 
00554         ff_end_tag(pb, avi->riff_start);
00555         avi->movi_list = avi_start_new_riff(s, pb, "AVIX", "movi");
00556     }
00557 
00558     avi_stream2fourcc(tag, stream_index, enc->codec_type);
00559     if(pkt->flags&AV_PKT_FLAG_KEY)
00560         flags = 0x10;
00561     if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
00562        avist->audio_strm_length += size;
00563     }
00564 
00565     if (s->pb->seekable) {
00566         AVIIndex* idx = &avist->indexes;
00567         int cl = idx->entry / AVI_INDEX_CLUSTER_SIZE;
00568         int id = idx->entry % AVI_INDEX_CLUSTER_SIZE;
00569         if (idx->ents_allocated <= idx->entry) {
00570             idx->cluster = av_realloc_f(idx->cluster, sizeof(void*), cl+1);
00571             if (!idx->cluster)
00572                 return -1;
00573             idx->cluster[cl] = av_malloc(AVI_INDEX_CLUSTER_SIZE*sizeof(AVIIentry));
00574             if (!idx->cluster[cl])
00575                 return -1;
00576             idx->ents_allocated += AVI_INDEX_CLUSTER_SIZE;
00577         }
00578 
00579         idx->cluster[cl][id].flags = flags;
00580         idx->cluster[cl][id].pos = avio_tell(pb) - avi->movi_list;
00581         idx->cluster[cl][id].len = size;
00582         idx->entry++;
00583     }
00584 
00585     avio_write(pb, tag, 4);
00586     avio_wl32(pb, size);
00587     avio_write(pb, pkt->data, size);
00588     if (size & 1)
00589         avio_w8(pb, 0);
00590 
00591     avio_flush(pb);
00592     return 0;
00593 }
00594 
00595 static int avi_write_trailer(AVFormatContext *s)
00596 {
00597     AVIContext *avi = s->priv_data;
00598     AVIOContext *pb = s->pb;
00599     int res = 0;
00600     int i, j, n, nb_frames;
00601     int64_t file_size;
00602 
00603     if (pb->seekable){
00604         if (avi->riff_id == 1) {
00605             ff_end_tag(pb, avi->movi_list);
00606             res = avi_write_idx1(s);
00607             ff_end_tag(pb, avi->riff_start);
00608         } else {
00609             avi_write_ix(s);
00610             ff_end_tag(pb, avi->movi_list);
00611             ff_end_tag(pb, avi->riff_start);
00612 
00613             file_size = avio_tell(pb);
00614             avio_seek(pb, avi->odml_list - 8, SEEK_SET);
00615             ffio_wfourcc(pb, "LIST"); /* Making this AVI OpenDML one */
00616             avio_skip(pb, 16);
00617 
00618             for (n=nb_frames=0;n<s->nb_streams;n++) {
00619                 AVCodecContext *stream = s->streams[n]->codec;
00620                 AVIStream *avist= s->streams[n]->priv_data;
00621 
00622                 if (stream->codec_type == AVMEDIA_TYPE_VIDEO) {
00623                     if (nb_frames < avist->packet_count)
00624                         nb_frames = avist->packet_count;
00625                 } else {
00626                     if (stream->codec_id == CODEC_ID_MP2 || stream->codec_id == CODEC_ID_MP3) {
00627                         nb_frames += avist->packet_count;
00628                     }
00629                 }
00630             }
00631             avio_wl32(pb, nb_frames);
00632             avio_seek(pb, file_size, SEEK_SET);
00633 
00634             avi_write_counters(s, avi->riff_id);
00635         }
00636     }
00637     avio_flush(pb);
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 format"),
00653     .mime_type         = "video/x-msvideo",
00654     .extensions        = "avi",
00655     .priv_data_size    = sizeof(AVIContext),
00656 #if CONFIG_LIBMP3LAME_ENCODER
00657     .audio_codec       = CODEC_ID_MP3,
00658 #else
00659     .audio_codec       = CODEC_ID_AC3,
00660 #endif
00661     .video_codec       = CODEC_ID_MPEG4,
00662     .write_header      = avi_write_header,
00663     .write_packet      = avi_write_packet,
00664     .write_trailer     = avi_write_trailer,
00665     .codec_tag         = (const AVCodecTag* const []){
00666         ff_codec_bmp_tags, ff_codec_wav_tags, 0
00667     },
00668     .flags             = AVFMT_VARIABLE_FPS,
00669 };