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 "avi.h"
00023 #include "riff.h"
00024 
00025 /*
00026  * TODO:
00027  *  - fill all fields if non streamed (nb_frames for example)
00028  */
00029 
00030 typedef struct AVIIentry {
00031     unsigned int flags, pos, len;
00032 } AVIIentry;
00033 
00034 #define AVI_INDEX_CLUSTER_SIZE 16384
00035 
00036 typedef struct AVIIndex {
00037     int64_t     indx_start;
00038     int         entry;
00039     int         ents_allocated;
00040     AVIIentry** cluster;
00041 } AVIIndex;
00042 
00043 typedef struct {
00044     int64_t riff_start, movi_list, odml_list;
00045     int64_t frames_hdr_all, frames_hdr_strm[MAX_STREAMS];
00046     int audio_strm_length[MAX_STREAMS];
00047     int riff_id;
00048     int packet_count[MAX_STREAMS];
00049 
00050     AVIIndex indexes[MAX_STREAMS];
00051 } AVIContext;
00052 
00053 static inline AVIIentry* avi_get_ientry(AVIIndex* idx, int ent_id)
00054 {
00055     int cl = ent_id / AVI_INDEX_CLUSTER_SIZE;
00056     int id = ent_id % AVI_INDEX_CLUSTER_SIZE;
00057     return &idx->cluster[cl][id];
00058 }
00059 
00060 static int64_t avi_start_new_riff(AVIContext *avi, ByteIOContext *pb,
00061                                   const char* riff_tag, const char* list_tag)
00062 {
00063     int64_t loff;
00064     int i;
00065 
00066     avi->riff_id++;
00067     for (i=0; i<MAX_STREAMS; i++)
00068          avi->indexes[i].entry = 0;
00069 
00070     avi->riff_start = start_tag(pb, "RIFF");
00071     put_tag(pb, riff_tag);
00072     loff = start_tag(pb, "LIST");
00073     put_tag(pb, list_tag);
00074     return loff;
00075 }
00076 
00077 static char* avi_stream2fourcc(char* tag, int index, enum CodecType type)
00078 {
00079     tag[0] = '0';
00080     tag[1] = '0' + index;
00081     if (type == CODEC_TYPE_VIDEO) {
00082         tag[2] = 'd';
00083         tag[3] = 'c';
00084     } else {
00085         tag[2] = 'w';
00086         tag[3] = 'b';
00087     }
00088     tag[4] = '\0';
00089     return tag;
00090 }
00091 
00092 static void avi_write_info_tag(ByteIOContext *pb, const char *tag, const char *str)
00093 {
00094     int len = strlen(str);
00095     if (len > 0) {
00096         len++;
00097         put_tag(pb, tag);
00098         put_le32(pb, len);
00099         put_strz(pb, str);
00100         if (len & 1)
00101             put_byte(pb, 0);
00102     }
00103 }
00104 
00105 static void avi_write_info_tag2(AVFormatContext *s, const char *fourcc, const char *key1, const char *key2)
00106 {
00107     AVMetadataTag *tag= av_metadata_get(s->metadata, key1, NULL, 0);
00108     if(!tag && key2)
00109         tag= av_metadata_get(s->metadata, key2, NULL, 0);
00110     if(tag)
00111         avi_write_info_tag(s->pb, fourcc, tag->value);
00112 }
00113 
00114 static int avi_write_counters(AVFormatContext* s, int riff_id)
00115 {
00116     ByteIOContext *pb = s->pb;
00117     AVIContext *avi = s->priv_data;
00118     int n, au_byterate, au_ssize, au_scale, nb_frames = 0;
00119     int64_t file_size;
00120     AVCodecContext* stream;
00121 
00122     file_size = url_ftell(pb);
00123     for(n = 0; n < s->nb_streams; n++) {
00124         assert(avi->frames_hdr_strm[n]);
00125         stream = s->streams[n]->codec;
00126         url_fseek(pb, avi->frames_hdr_strm[n], SEEK_SET);
00127         ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
00128         if(au_ssize == 0) {
00129             put_le32(pb, avi->packet_count[n]);
00130         } else {
00131             put_le32(pb, avi->audio_strm_length[n] / au_ssize);
00132         }
00133         if(stream->codec_type == CODEC_TYPE_VIDEO)
00134             nb_frames = FFMAX(nb_frames, avi->packet_count[n]);
00135     }
00136     if(riff_id == 1) {
00137         assert(avi->frames_hdr_all);
00138         url_fseek(pb, avi->frames_hdr_all, SEEK_SET);
00139         put_le32(pb, nb_frames);
00140     }
00141     url_fseek(pb, file_size, SEEK_SET);
00142 
00143     return 0;
00144 }
00145 
00146 static int avi_write_header(AVFormatContext *s)
00147 {
00148     AVIContext *avi = s->priv_data;
00149     ByteIOContext *pb = s->pb;
00150     int bitrate, n, i, nb_frames, au_byterate, au_ssize, au_scale;
00151     AVCodecContext *stream, *video_enc;
00152     int64_t list1, list2, strh, strf;
00153 
00154     /* header list */
00155     avi->riff_id = 0;
00156     list1 = avi_start_new_riff(avi, pb, "AVI ", "hdrl");
00157 
00158     /* avi header */
00159     put_tag(pb, "avih");
00160     put_le32(pb, 14 * 4);
00161     bitrate = 0;
00162 
00163     video_enc = NULL;
00164     for(n=0;n<s->nb_streams;n++) {
00165         stream = s->streams[n]->codec;
00166         bitrate += stream->bit_rate;
00167         if (stream->codec_type == CODEC_TYPE_VIDEO)
00168             video_enc = stream;
00169     }
00170 
00171     nb_frames = 0;
00172 
00173     if(video_enc){
00174         put_le32(pb, (uint32_t)(INT64_C(1000000) * video_enc->time_base.num / video_enc->time_base.den));
00175     } else {
00176         put_le32(pb, 0);
00177     }
00178     put_le32(pb, bitrate / 8); /* XXX: not quite exact */
00179     put_le32(pb, 0); /* padding */
00180     if (url_is_streamed(pb))
00181         put_le32(pb, AVIF_TRUSTCKTYPE | AVIF_ISINTERLEAVED); /* flags */
00182     else
00183         put_le32(pb, AVIF_TRUSTCKTYPE | AVIF_HASINDEX | AVIF_ISINTERLEAVED); /* flags */
00184     avi->frames_hdr_all = url_ftell(pb); /* remember this offset to fill later */
00185     put_le32(pb, nb_frames); /* nb frames, filled later */
00186     put_le32(pb, 0); /* initial frame */
00187     put_le32(pb, s->nb_streams); /* nb streams */
00188     put_le32(pb, 1024 * 1024); /* suggested buffer size */
00189     if(video_enc){
00190         put_le32(pb, video_enc->width);
00191         put_le32(pb, video_enc->height);
00192     } else {
00193         put_le32(pb, 0);
00194         put_le32(pb, 0);
00195     }
00196     put_le32(pb, 0); /* reserved */
00197     put_le32(pb, 0); /* reserved */
00198     put_le32(pb, 0); /* reserved */
00199     put_le32(pb, 0); /* reserved */
00200 
00201     /* stream list */
00202     for(i=0;i<n;i++) {
00203         list2 = start_tag(pb, "LIST");
00204         put_tag(pb, "strl");
00205 
00206         stream = s->streams[i]->codec;
00207 
00208         /* stream generic header */
00209         strh = start_tag(pb, "strh");
00210         switch(stream->codec_type) {
00211         case CODEC_TYPE_VIDEO: put_tag(pb, "vids"); break;
00212         case CODEC_TYPE_AUDIO: put_tag(pb, "auds"); break;
00213 //        case CODEC_TYPE_TEXT : put_tag(pb, "txts"); break;
00214         case CODEC_TYPE_DATA : put_tag(pb, "dats"); break;
00215         }
00216         if(stream->codec_type == CODEC_TYPE_VIDEO)
00217             put_le32(pb, stream->codec_tag);
00218         else
00219             put_le32(pb, 1);
00220         put_le32(pb, 0); /* flags */
00221         put_le16(pb, 0); /* priority */
00222         put_le16(pb, 0); /* language */
00223         put_le32(pb, 0); /* initial frame */
00224 
00225         ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
00226 
00227         put_le32(pb, au_scale); /* scale */
00228         put_le32(pb, au_byterate); /* rate */
00229         av_set_pts_info(s->streams[i], 64, au_scale, au_byterate);
00230 
00231         put_le32(pb, 0); /* start */
00232         avi->frames_hdr_strm[i] = url_ftell(pb); /* remember this offset to fill later */
00233         if (url_is_streamed(pb))
00234             put_le32(pb, AVI_MAX_RIFF_SIZE); /* FIXME: this may be broken, but who cares */
00235         else
00236             put_le32(pb, 0); /* length, XXX: filled later */
00237 
00238         /* suggested buffer size */ //FIXME set at the end to largest chunk
00239         if(stream->codec_type == CODEC_TYPE_VIDEO)
00240             put_le32(pb, 1024 * 1024);
00241         else if(stream->codec_type == CODEC_TYPE_AUDIO)
00242             put_le32(pb, 12 * 1024);
00243         else
00244             put_le32(pb, 0);
00245         put_le32(pb, -1); /* quality */
00246         put_le32(pb, au_ssize); /* sample size */
00247         put_le32(pb, 0);
00248         put_le16(pb, stream->width);
00249         put_le16(pb, stream->height);
00250         end_tag(pb, strh);
00251 
00252       if(stream->codec_type != CODEC_TYPE_DATA){
00253         strf = start_tag(pb, "strf");
00254         switch(stream->codec_type) {
00255         case CODEC_TYPE_VIDEO:
00256             put_bmp_header(pb, stream, codec_bmp_tags, 0);
00257             break;
00258         case CODEC_TYPE_AUDIO:
00259             if (put_wav_header(pb, stream) < 0) {
00260                 return -1;
00261             }
00262             break;
00263         default:
00264             return -1;
00265         }
00266         end_tag(pb, strf);
00267       }
00268 
00269         if (!url_is_streamed(pb)) {
00270             unsigned char tag[5];
00271             int j;
00272 
00273             /* Starting to lay out AVI OpenDML master index.
00274              * We want to make it JUNK entry for now, since we'd
00275              * like to get away without making AVI an OpenDML one
00276              * for compatibility reasons.
00277              */
00278             avi->indexes[i].entry = avi->indexes[i].ents_allocated = 0;
00279             avi->indexes[i].indx_start = start_tag(pb, "JUNK");
00280             put_le16(pb, 4);        /* wLongsPerEntry */
00281             put_byte(pb, 0);        /* bIndexSubType (0 == frame index) */
00282             put_byte(pb, 0);        /* bIndexType (0 == AVI_INDEX_OF_INDEXES) */
00283             put_le32(pb, 0);        /* nEntriesInUse (will fill out later on) */
00284             put_tag(pb, avi_stream2fourcc(&tag[0], i, stream->codec_type));
00285                                     /* dwChunkId */
00286             put_le64(pb, 0);        /* dwReserved[3]
00287             put_le32(pb, 0);           Must be 0.    */
00288             for (j=0; j < AVI_MASTER_INDEX_SIZE * 2; j++)
00289                  put_le64(pb, 0);
00290             end_tag(pb, avi->indexes[i].indx_start);
00291         }
00292 
00293         if(   stream->codec_type == CODEC_TYPE_VIDEO
00294            && s->streams[i]->sample_aspect_ratio.num>0
00295            && s->streams[i]->sample_aspect_ratio.den>0){
00296             int vprp= start_tag(pb, "vprp");
00297             AVRational dar = av_mul_q(s->streams[i]->sample_aspect_ratio,
00298                                       (AVRational){stream->width, stream->height});
00299             int num, den;
00300             av_reduce(&num, &den, dar.num, dar.den, 0xFFFF);
00301 
00302             put_le32(pb, 0); //video format  = unknown
00303             put_le32(pb, 0); //video standard= unknown
00304             put_le32(pb, lrintf(1.0/av_q2d(stream->time_base)));
00305             put_le32(pb, stream->width );
00306             put_le32(pb, stream->height);
00307             put_le16(pb, den);
00308             put_le16(pb, num);
00309             put_le32(pb, stream->width );
00310             put_le32(pb, stream->height);
00311             put_le32(pb, 1); //progressive FIXME
00312 
00313             put_le32(pb, stream->height);
00314             put_le32(pb, stream->width );
00315             put_le32(pb, stream->height);
00316             put_le32(pb, stream->width );
00317             put_le32(pb, 0);
00318             put_le32(pb, 0);
00319 
00320             put_le32(pb, 0);
00321             put_le32(pb, 0);
00322             end_tag(pb, vprp);
00323         }
00324 
00325         end_tag(pb, list2);
00326     }
00327 
00328     if (!url_is_streamed(pb)) {
00329         /* AVI could become an OpenDML one, if it grows beyond 2Gb range */
00330         avi->odml_list = start_tag(pb, "JUNK");
00331         put_tag(pb, "odml");
00332         put_tag(pb, "dmlh");
00333         put_le32(pb, 248);
00334         for (i = 0; i < 248; i+= 4)
00335              put_le32(pb, 0);
00336         end_tag(pb, avi->odml_list);
00337     }
00338 
00339     end_tag(pb, list1);
00340 
00341     list2 = start_tag(pb, "LIST");
00342     put_tag(pb, "INFO");
00343     avi_write_info_tag2(s, "INAM", "Title", NULL);
00344     avi_write_info_tag2(s, "IART", "Artist", "Author");
00345     avi_write_info_tag2(s, "ICOP", "Copyright", NULL);
00346     avi_write_info_tag2(s, "ICMT", "Comment", NULL);
00347     avi_write_info_tag2(s, "IPRD", "Album", NULL);
00348     avi_write_info_tag2(s, "IGNR", "Genre", NULL);
00349     avi_write_info_tag2(s, "IPRT", "Track", NULL);
00350     if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
00351         avi_write_info_tag(pb, "ISFT", LIBAVFORMAT_IDENT);
00352     end_tag(pb, list2);
00353 
00354     /* some padding for easier tag editing */
00355     list2 = start_tag(pb, "JUNK");
00356     for (i = 0; i < 1016; i += 4)
00357         put_le32(pb, 0);
00358     end_tag(pb, list2);
00359 
00360     avi->movi_list = start_tag(pb, "LIST");
00361     put_tag(pb, "movi");
00362 
00363     put_flush_packet(pb);
00364 
00365     return 0;
00366 }
00367 
00368 static int avi_write_ix(AVFormatContext *s)
00369 {
00370     ByteIOContext *pb = s->pb;
00371     AVIContext *avi = s->priv_data;
00372     char tag[5];
00373     char ix_tag[] = "ix00";
00374     int i, j;
00375 
00376     assert(!url_is_streamed(pb));
00377 
00378     if (avi->riff_id > AVI_MASTER_INDEX_SIZE)
00379         return -1;
00380 
00381     for (i=0;i<s->nb_streams;i++) {
00382          int64_t ix, pos;
00383 
00384          avi_stream2fourcc(&tag[0], i, s->streams[i]->codec->codec_type);
00385          ix_tag[3] = '0' + i;
00386 
00387          /* Writing AVI OpenDML leaf index chunk */
00388          ix = url_ftell(pb);
00389          put_tag(pb, &ix_tag[0]);     /* ix?? */
00390          put_le32(pb, avi->indexes[i].entry * 8 + 24);
00391                                       /* chunk size */
00392          put_le16(pb, 2);             /* wLongsPerEntry */
00393          put_byte(pb, 0);             /* bIndexSubType (0 == frame index) */
00394          put_byte(pb, 1);             /* bIndexType (1 == AVI_INDEX_OF_CHUNKS) */
00395          put_le32(pb, avi->indexes[i].entry);
00396                                       /* nEntriesInUse */
00397          put_tag(pb, &tag[0]);        /* dwChunkId */
00398          put_le64(pb, avi->movi_list);/* qwBaseOffset */
00399          put_le32(pb, 0);             /* dwReserved_3 (must be 0) */
00400 
00401          for (j=0; j<avi->indexes[i].entry; j++) {
00402              AVIIentry* ie = avi_get_ientry(&avi->indexes[i], j);
00403              put_le32(pb, ie->pos + 8);
00404              put_le32(pb, ((uint32_t)ie->len & ~0x80000000) |
00405                           (ie->flags & 0x10 ? 0 : 0x80000000));
00406          }
00407          put_flush_packet(pb);
00408          pos = url_ftell(pb);
00409 
00410          /* Updating one entry in the AVI OpenDML master index */
00411          url_fseek(pb, avi->indexes[i].indx_start - 8, SEEK_SET);
00412          put_tag(pb, "indx");                 /* enabling this entry */
00413          url_fskip(pb, 8);
00414          put_le32(pb, avi->riff_id);          /* nEntriesInUse */
00415          url_fskip(pb, 16*avi->riff_id);
00416          put_le64(pb, ix);                    /* qwOffset */
00417          put_le32(pb, pos - ix);              /* dwSize */
00418          put_le32(pb, avi->indexes[i].entry); /* dwDuration */
00419 
00420          url_fseek(pb, pos, SEEK_SET);
00421     }
00422     return 0;
00423 }
00424 
00425 static int avi_write_idx1(AVFormatContext *s)
00426 {
00427     ByteIOContext *pb = s->pb;
00428     AVIContext *avi = s->priv_data;
00429     int64_t idx_chunk;
00430     int i;
00431     char tag[5];
00432 
00433     if (!url_is_streamed(pb)) {
00434         AVIIentry* ie = 0, *tie;
00435         int entry[MAX_STREAMS];
00436         int empty, stream_id = -1;
00437 
00438         idx_chunk = start_tag(pb, "idx1");
00439         memset(&entry[0], 0, sizeof(entry));
00440         do {
00441             empty = 1;
00442             for (i=0; i<s->nb_streams; i++) {
00443                  if (avi->indexes[i].entry <= entry[i])
00444                      continue;
00445 
00446                  tie = avi_get_ientry(&avi->indexes[i], entry[i]);
00447                  if (empty || tie->pos < ie->pos) {
00448                      ie = tie;
00449                      stream_id = i;
00450                  }
00451                  empty = 0;
00452             }
00453             if (!empty) {
00454                 avi_stream2fourcc(&tag[0], stream_id,
00455                                   s->streams[stream_id]->codec->codec_type);
00456                 put_tag(pb, &tag[0]);
00457                 put_le32(pb, ie->flags);
00458                 put_le32(pb, ie->pos);
00459                 put_le32(pb, ie->len);
00460                 entry[stream_id]++;
00461             }
00462         } while (!empty);
00463         end_tag(pb, idx_chunk);
00464 
00465         avi_write_counters(s, avi->riff_id);
00466     }
00467     return 0;
00468 }
00469 
00470 static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
00471 {
00472     AVIContext *avi = s->priv_data;
00473     ByteIOContext *pb = s->pb;
00474     unsigned char tag[5];
00475     unsigned int flags=0;
00476     const int stream_index= pkt->stream_index;
00477     AVCodecContext *enc= s->streams[stream_index]->codec;
00478     int size= pkt->size;
00479 
00480 //    av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %d\n", pkt->dts, avi->packet_count[stream_index], stream_index);
00481     while(enc->block_align==0 && pkt->dts != AV_NOPTS_VALUE && pkt->dts > avi->packet_count[stream_index]){
00482         AVPacket empty_packet;
00483 
00484         av_init_packet(&empty_packet);
00485         empty_packet.size= 0;
00486         empty_packet.data= NULL;
00487         empty_packet.stream_index= stream_index;
00488         avi_write_packet(s, &empty_packet);
00489 //        av_log(s, AV_LOG_DEBUG, "dup %"PRId64" %d\n", pkt->dts, avi->packet_count[stream_index]);
00490     }
00491     avi->packet_count[stream_index]++;
00492 
00493     // Make sure to put an OpenDML chunk when the file size exceeds the limits
00494     if (!url_is_streamed(pb) &&
00495         (url_ftell(pb) - avi->riff_start > AVI_MAX_RIFF_SIZE)) {
00496 
00497         avi_write_ix(s);
00498         end_tag(pb, avi->movi_list);
00499 
00500         if (avi->riff_id == 1)
00501             avi_write_idx1(s);
00502 
00503         end_tag(pb, avi->riff_start);
00504         avi->movi_list = avi_start_new_riff(avi, pb, "AVIX", "movi");
00505     }
00506 
00507     avi_stream2fourcc(&tag[0], stream_index, enc->codec_type);
00508     if(pkt->flags&PKT_FLAG_KEY)
00509         flags = 0x10;
00510     if (enc->codec_type == CODEC_TYPE_AUDIO) {
00511        avi->audio_strm_length[stream_index] += size;
00512     }
00513 
00514     if (!url_is_streamed(s->pb)) {
00515         AVIIndex* idx = &avi->indexes[stream_index];
00516         int cl = idx->entry / AVI_INDEX_CLUSTER_SIZE;
00517         int id = idx->entry % AVI_INDEX_CLUSTER_SIZE;
00518         if (idx->ents_allocated <= idx->entry) {
00519             idx->cluster = av_realloc(idx->cluster, (cl+1)*sizeof(void*));
00520             if (!idx->cluster)
00521                 return -1;
00522             idx->cluster[cl] = av_malloc(AVI_INDEX_CLUSTER_SIZE*sizeof(AVIIentry));
00523             if (!idx->cluster[cl])
00524                 return -1;
00525             idx->ents_allocated += AVI_INDEX_CLUSTER_SIZE;
00526         }
00527 
00528         idx->cluster[cl][id].flags = flags;
00529         idx->cluster[cl][id].pos = url_ftell(pb) - avi->movi_list;
00530         idx->cluster[cl][id].len = size;
00531         idx->entry++;
00532     }
00533 
00534     put_buffer(pb, tag, 4);
00535     put_le32(pb, size);
00536     put_buffer(pb, pkt->data, size);
00537     if (size & 1)
00538         put_byte(pb, 0);
00539 
00540     put_flush_packet(pb);
00541     return 0;
00542 }
00543 
00544 static int avi_write_trailer(AVFormatContext *s)
00545 {
00546     AVIContext *avi = s->priv_data;
00547     ByteIOContext *pb = s->pb;
00548     int res = 0;
00549     int i, j, n, nb_frames;
00550     int64_t file_size;
00551 
00552     if (!url_is_streamed(pb)){
00553         if (avi->riff_id == 1) {
00554             end_tag(pb, avi->movi_list);
00555             res = avi_write_idx1(s);
00556             end_tag(pb, avi->riff_start);
00557         } else {
00558             avi_write_ix(s);
00559             end_tag(pb, avi->movi_list);
00560             end_tag(pb, avi->riff_start);
00561 
00562             file_size = url_ftell(pb);
00563             url_fseek(pb, avi->odml_list - 8, SEEK_SET);
00564             put_tag(pb, "LIST"); /* Making this AVI OpenDML one */
00565             url_fskip(pb, 16);
00566 
00567             for (n=nb_frames=0;n<s->nb_streams;n++) {
00568                 AVCodecContext *stream = s->streams[n]->codec;
00569                 if (stream->codec_type == CODEC_TYPE_VIDEO) {
00570                     if (nb_frames < avi->packet_count[n])
00571                         nb_frames = avi->packet_count[n];
00572                 } else {
00573                     if (stream->codec_id == CODEC_ID_MP2 || stream->codec_id == CODEC_ID_MP3) {
00574                         nb_frames += avi->packet_count[n];
00575                     }
00576                 }
00577             }
00578             put_le32(pb, nb_frames);
00579             url_fseek(pb, file_size, SEEK_SET);
00580 
00581             avi_write_counters(s, avi->riff_id);
00582         }
00583     }
00584     put_flush_packet(pb);
00585 
00586     for (i=0; i<MAX_STREAMS; i++) {
00587          for (j=0; j<avi->indexes[i].ents_allocated/AVI_INDEX_CLUSTER_SIZE; j++)
00588               av_free(avi->indexes[i].cluster[j]);
00589          av_free(avi->indexes[i].cluster);
00590          avi->indexes[i].cluster = NULL;
00591          avi->indexes[i].ents_allocated = avi->indexes[i].entry = 0;
00592     }
00593 
00594     return res;
00595 }
00596 
00597 AVOutputFormat avi_muxer = {
00598     "avi",
00599     NULL_IF_CONFIG_SMALL("AVI format"),
00600     "video/x-msvideo",
00601     "avi",
00602     sizeof(AVIContext),
00603     CODEC_ID_MP2,
00604     CODEC_ID_MPEG4,
00605     avi_write_header,
00606     avi_write_packet,
00607     avi_write_trailer,
00608     .codec_tag= (const AVCodecTag* const []){codec_bmp_tags, codec_wav_tags, 0},
00609     .flags= AVFMT_VARIABLE_FPS,
00610 };