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 #include "libavutil/intreadwrite.h"
00025 
00026 /*
00027  * TODO:
00028  *  - fill all fields if non streamed (nb_frames for example)
00029  */
00030 
00031 typedef struct AVIIentry {
00032     unsigned int flags, pos, len;
00033 } AVIIentry;
00034 
00035 #define AVI_INDEX_CLUSTER_SIZE 16384
00036 
00037 typedef struct AVIIndex {
00038     int64_t     indx_start;
00039     int         entry;
00040     int         ents_allocated;
00041     AVIIentry** cluster;
00042 } AVIIndex;
00043 
00044 typedef struct {
00045     int64_t riff_start, movi_list, odml_list;
00046     int64_t frames_hdr_all;
00047     int riff_id;
00048 } AVIContext;
00049 
00050 typedef struct  {
00051     int64_t frames_hdr_strm;
00052     int audio_strm_length;
00053     int packet_count;
00054     int entry;
00055 
00056     AVIIndex indexes;
00057 } AVIStream ;
00058 
00059 static inline AVIIentry* avi_get_ientry(AVIIndex* idx, int ent_id)
00060 {
00061     int cl = ent_id / AVI_INDEX_CLUSTER_SIZE;
00062     int id = ent_id % AVI_INDEX_CLUSTER_SIZE;
00063     return &idx->cluster[cl][id];
00064 }
00065 
00066 static int64_t avi_start_new_riff(AVFormatContext *s, ByteIOContext *pb,
00067                                   const char* riff_tag, const char* list_tag)
00068 {
00069     AVIContext *avi= s->priv_data;
00070     int64_t loff;
00071     int i;
00072 
00073     avi->riff_id++;
00074     for (i=0; i<s->nb_streams; i++){
00075         AVIStream *avist= s->streams[i]->priv_data;
00076         avist->indexes.entry = 0;
00077     }
00078 
00079     avi->riff_start = ff_start_tag(pb, "RIFF");
00080     put_tag(pb, riff_tag);
00081     loff = ff_start_tag(pb, "LIST");
00082     put_tag(pb, list_tag);
00083     return loff;
00084 }
00085 
00086 static char* avi_stream2fourcc(char* tag, int index, enum AVMediaType type)
00087 {
00088     tag[0] = '0';
00089     tag[1] = '0' + index;
00090     if (type == AVMEDIA_TYPE_VIDEO) {
00091         tag[2] = 'd';
00092         tag[3] = 'c';
00093     } else if (type == AVMEDIA_TYPE_SUBTITLE) {
00094         // note: this is not an official code
00095         tag[2] = 's';
00096         tag[3] = 'b';
00097     } else {
00098         tag[2] = 'w';
00099         tag[3] = 'b';
00100     }
00101     tag[4] = '\0';
00102     return tag;
00103 }
00104 
00105 static void avi_write_info_tag(ByteIOContext *pb, const char *tag, const char *str)
00106 {
00107     int len = strlen(str);
00108     if (len > 0) {
00109         len++;
00110         put_tag(pb, tag);
00111         put_le32(pb, len);
00112         put_strz(pb, str);
00113         if (len & 1)
00114             put_byte(pb, 0);
00115     }
00116 }
00117 
00118 static int avi_write_counters(AVFormatContext* s, int riff_id)
00119 {
00120     ByteIOContext *pb = s->pb;
00121     AVIContext *avi = s->priv_data;
00122     int n, au_byterate, au_ssize, au_scale, nb_frames = 0;
00123     int64_t file_size;
00124     AVCodecContext* stream;
00125 
00126     file_size = url_ftell(pb);
00127     for(n = 0; n < s->nb_streams; n++) {
00128         AVIStream *avist= s->streams[n]->priv_data;
00129 
00130         assert(avist->frames_hdr_strm);
00131         stream = s->streams[n]->codec;
00132         url_fseek(pb, avist->frames_hdr_strm, SEEK_SET);
00133         ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
00134         if(au_ssize == 0) {
00135             put_le32(pb, avist->packet_count);
00136         } else {
00137             put_le32(pb, avist->audio_strm_length / au_ssize);
00138         }
00139         if(stream->codec_type == AVMEDIA_TYPE_VIDEO)
00140             nb_frames = FFMAX(nb_frames, avist->packet_count);
00141     }
00142     if(riff_id == 1) {
00143         assert(avi->frames_hdr_all);
00144         url_fseek(pb, avi->frames_hdr_all, SEEK_SET);
00145         put_le32(pb, nb_frames);
00146     }
00147     url_fseek(pb, file_size, SEEK_SET);
00148 
00149     return 0;
00150 }
00151 
00152 static int avi_write_header(AVFormatContext *s)
00153 {
00154     AVIContext *avi = s->priv_data;
00155     ByteIOContext *pb = s->pb;
00156     int bitrate, n, i, nb_frames, au_byterate, au_ssize, au_scale;
00157     AVCodecContext *stream, *video_enc;
00158     int64_t list1, list2, strh, strf;
00159     AVMetadataTag *t = NULL;
00160 
00161     for(n=0;n<s->nb_streams;n++) {
00162         s->streams[n]->priv_data= av_mallocz(sizeof(AVIStream));
00163         if(!s->streams[n]->priv_data)
00164             return AVERROR(ENOMEM);
00165     }
00166 
00167     /* header list */
00168     avi->riff_id = 0;
00169     list1 = avi_start_new_riff(s, pb, "AVI ", "hdrl");
00170 
00171     /* avi header */
00172     put_tag(pb, "avih");
00173     put_le32(pb, 14 * 4);
00174     bitrate = 0;
00175 
00176     video_enc = NULL;
00177     for(n=0;n<s->nb_streams;n++) {
00178         stream = s->streams[n]->codec;
00179         bitrate += stream->bit_rate;
00180         if (stream->codec_type == AVMEDIA_TYPE_VIDEO)
00181             video_enc = stream;
00182     }
00183 
00184     nb_frames = 0;
00185 
00186     if(video_enc){
00187         put_le32(pb, (uint32_t)(INT64_C(1000000) * video_enc->time_base.num / video_enc->time_base.den));
00188     } else {
00189         put_le32(pb, 0);
00190     }
00191     put_le32(pb, bitrate / 8); /* XXX: not quite exact */
00192     put_le32(pb, 0); /* padding */
00193     if (url_is_streamed(pb))
00194         put_le32(pb, AVIF_TRUSTCKTYPE | AVIF_ISINTERLEAVED); /* flags */
00195     else
00196         put_le32(pb, AVIF_TRUSTCKTYPE | AVIF_HASINDEX | AVIF_ISINTERLEAVED); /* flags */
00197     avi->frames_hdr_all = url_ftell(pb); /* remember this offset to fill later */
00198     put_le32(pb, nb_frames); /* nb frames, filled later */
00199     put_le32(pb, 0); /* initial frame */
00200     put_le32(pb, s->nb_streams); /* nb streams */
00201     put_le32(pb, 1024 * 1024); /* suggested buffer size */
00202     if(video_enc){
00203         put_le32(pb, video_enc->width);
00204         put_le32(pb, video_enc->height);
00205     } else {
00206         put_le32(pb, 0);
00207         put_le32(pb, 0);
00208     }
00209     put_le32(pb, 0); /* reserved */
00210     put_le32(pb, 0); /* reserved */
00211     put_le32(pb, 0); /* reserved */
00212     put_le32(pb, 0); /* reserved */
00213 
00214     /* stream list */
00215     for(i=0;i<n;i++) {
00216         AVIStream *avist= s->streams[i]->priv_data;
00217         list2 = ff_start_tag(pb, "LIST");
00218         put_tag(pb, "strl");
00219 
00220         stream = s->streams[i]->codec;
00221 
00222         /* stream generic header */
00223         strh = ff_start_tag(pb, "strh");
00224         switch(stream->codec_type) {
00225         case AVMEDIA_TYPE_SUBTITLE:
00226             // XSUB subtitles behave like video tracks, other subtitles
00227             // are not (yet) supported.
00228             if (stream->codec_id != CODEC_ID_XSUB) {
00229                 av_log(s, AV_LOG_ERROR, "Subtitle streams other than DivX XSUB are not supported by the AVI muxer.\n");
00230                 return AVERROR_PATCHWELCOME;
00231             }
00232         case AVMEDIA_TYPE_VIDEO: put_tag(pb, "vids"); break;
00233         case AVMEDIA_TYPE_AUDIO: put_tag(pb, "auds"); break;
00234 //        case AVMEDIA_TYPE_TEXT : put_tag(pb, "txts"); break;
00235         case AVMEDIA_TYPE_DATA : put_tag(pb, "dats"); break;
00236         }
00237         if(stream->codec_type == AVMEDIA_TYPE_VIDEO ||
00238            stream->codec_id == CODEC_ID_XSUB)
00239             put_le32(pb, stream->codec_tag);
00240         else
00241             put_le32(pb, 1);
00242         put_le32(pb, 0); /* flags */
00243         put_le16(pb, 0); /* priority */
00244         put_le16(pb, 0); /* language */
00245         put_le32(pb, 0); /* initial frame */
00246 
00247         ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
00248 
00249         put_le32(pb, au_scale); /* scale */
00250         put_le32(pb, au_byterate); /* rate */
00251         av_set_pts_info(s->streams[i], 64, au_scale, au_byterate);
00252 
00253         put_le32(pb, 0); /* start */
00254         avist->frames_hdr_strm = url_ftell(pb); /* remember this offset to fill later */
00255         if (url_is_streamed(pb))
00256             put_le32(pb, AVI_MAX_RIFF_SIZE); /* FIXME: this may be broken, but who cares */
00257         else
00258             put_le32(pb, 0); /* length, XXX: filled later */
00259 
00260         /* suggested buffer size */ //FIXME set at the end to largest chunk
00261         if(stream->codec_type == AVMEDIA_TYPE_VIDEO)
00262             put_le32(pb, 1024 * 1024);
00263         else if(stream->codec_type == AVMEDIA_TYPE_AUDIO)
00264             put_le32(pb, 12 * 1024);
00265         else
00266             put_le32(pb, 0);
00267         put_le32(pb, -1); /* quality */
00268         put_le32(pb, au_ssize); /* sample size */
00269         put_le32(pb, 0);
00270         put_le16(pb, stream->width);
00271         put_le16(pb, stream->height);
00272         ff_end_tag(pb, strh);
00273 
00274       if(stream->codec_type != AVMEDIA_TYPE_DATA){
00275         strf = ff_start_tag(pb, "strf");
00276         switch(stream->codec_type) {
00277         case AVMEDIA_TYPE_SUBTITLE:
00278             // XSUB subtitles behave like video tracks, other subtitles
00279             // are not (yet) supported.
00280             if (stream->codec_id != CODEC_ID_XSUB) break;
00281         case AVMEDIA_TYPE_VIDEO:
00282             ff_put_bmp_header(pb, stream, ff_codec_bmp_tags, 0);
00283             break;
00284         case AVMEDIA_TYPE_AUDIO:
00285             if (ff_put_wav_header(pb, stream) < 0) {
00286                 return -1;
00287             }
00288             break;
00289         default:
00290             return -1;
00291         }
00292         ff_end_tag(pb, strf);
00293         if ((t = av_metadata_get(s->streams[i]->metadata, "title", NULL, 0))) {
00294             avi_write_info_tag(s->pb, "strn", t->value);
00295             t = NULL;
00296         }
00297       }
00298 
00299         if (!url_is_streamed(pb)) {
00300             unsigned char tag[5];
00301             int j;
00302 
00303             /* Starting to lay out AVI OpenDML master index.
00304              * We want to make it JUNK entry for now, since we'd
00305              * like to get away without making AVI an OpenDML one
00306              * for compatibility reasons.
00307              */
00308             avist->indexes.entry = avist->indexes.ents_allocated = 0;
00309             avist->indexes.indx_start = ff_start_tag(pb, "JUNK");
00310             put_le16(pb, 4);        /* wLongsPerEntry */
00311             put_byte(pb, 0);        /* bIndexSubType (0 == frame index) */
00312             put_byte(pb, 0);        /* bIndexType (0 == AVI_INDEX_OF_INDEXES) */
00313             put_le32(pb, 0);        /* nEntriesInUse (will fill out later on) */
00314             put_tag(pb, avi_stream2fourcc(&tag[0], i, stream->codec_type));
00315                                     /* dwChunkId */
00316             put_le64(pb, 0);        /* dwReserved[3]
00317             put_le32(pb, 0);           Must be 0.    */
00318             for (j=0; j < AVI_MASTER_INDEX_SIZE * 2; j++)
00319                  put_le64(pb, 0);
00320             ff_end_tag(pb, avist->indexes.indx_start);
00321         }
00322 
00323         if(   stream->codec_type == AVMEDIA_TYPE_VIDEO
00324            && s->streams[i]->sample_aspect_ratio.num>0
00325            && s->streams[i]->sample_aspect_ratio.den>0){
00326             int vprp= ff_start_tag(pb, "vprp");
00327             AVRational dar = av_mul_q(s->streams[i]->sample_aspect_ratio,
00328                                       (AVRational){stream->width, stream->height});
00329             int num, den;
00330             av_reduce(&num, &den, dar.num, dar.den, 0xFFFF);
00331 
00332             put_le32(pb, 0); //video format  = unknown
00333             put_le32(pb, 0); //video standard= unknown
00334             put_le32(pb, lrintf(1.0/av_q2d(stream->time_base)));
00335             put_le32(pb, stream->width );
00336             put_le32(pb, stream->height);
00337             put_le16(pb, den);
00338             put_le16(pb, num);
00339             put_le32(pb, stream->width );
00340             put_le32(pb, stream->height);
00341             put_le32(pb, 1); //progressive FIXME
00342 
00343             put_le32(pb, stream->height);
00344             put_le32(pb, stream->width );
00345             put_le32(pb, stream->height);
00346             put_le32(pb, stream->width );
00347             put_le32(pb, 0);
00348             put_le32(pb, 0);
00349 
00350             put_le32(pb, 0);
00351             put_le32(pb, 0);
00352             ff_end_tag(pb, vprp);
00353         }
00354 
00355         ff_end_tag(pb, list2);
00356     }
00357 
00358     if (!url_is_streamed(pb)) {
00359         /* AVI could become an OpenDML one, if it grows beyond 2Gb range */
00360         avi->odml_list = ff_start_tag(pb, "JUNK");
00361         put_tag(pb, "odml");
00362         put_tag(pb, "dmlh");
00363         put_le32(pb, 248);
00364         for (i = 0; i < 248; i+= 4)
00365              put_le32(pb, 0);
00366         ff_end_tag(pb, avi->odml_list);
00367     }
00368 
00369     ff_end_tag(pb, list1);
00370 
00371     list2 = ff_start_tag(pb, "LIST");
00372     put_tag(pb, "INFO");
00373     ff_metadata_conv(&s->metadata, ff_avi_metadata_conv, NULL);
00374     for (i = 0; *ff_avi_tags[i]; i++) {
00375         if ((t = av_metadata_get(s->metadata, ff_avi_tags[i], NULL, AV_METADATA_MATCH_CASE)))
00376             avi_write_info_tag(s->pb, t->key, t->value);
00377     }
00378     ff_end_tag(pb, list2);
00379 
00380     /* some padding for easier tag editing */
00381     list2 = ff_start_tag(pb, "JUNK");
00382     for (i = 0; i < 1016; i += 4)
00383         put_le32(pb, 0);
00384     ff_end_tag(pb, list2);
00385 
00386     avi->movi_list = ff_start_tag(pb, "LIST");
00387     put_tag(pb, "movi");
00388 
00389     put_flush_packet(pb);
00390 
00391     return 0;
00392 }
00393 
00394 static int avi_write_ix(AVFormatContext *s)
00395 {
00396     ByteIOContext *pb = s->pb;
00397     AVIContext *avi = s->priv_data;
00398     char tag[5];
00399     char ix_tag[] = "ix00";
00400     int i, j;
00401 
00402     assert(!url_is_streamed(pb));
00403 
00404     if (avi->riff_id > AVI_MASTER_INDEX_SIZE)
00405         return -1;
00406 
00407     for (i=0;i<s->nb_streams;i++) {
00408         AVIStream *avist= s->streams[i]->priv_data;
00409          int64_t ix, pos;
00410 
00411          avi_stream2fourcc(&tag[0], i, s->streams[i]->codec->codec_type);
00412          ix_tag[3] = '0' + i;
00413 
00414          /* Writing AVI OpenDML leaf index chunk */
00415          ix = url_ftell(pb);
00416          put_tag(pb, &ix_tag[0]);     /* ix?? */
00417          put_le32(pb, avist->indexes.entry * 8 + 24);
00418                                       /* chunk size */
00419          put_le16(pb, 2);             /* wLongsPerEntry */
00420          put_byte(pb, 0);             /* bIndexSubType (0 == frame index) */
00421          put_byte(pb, 1);             /* bIndexType (1 == AVI_INDEX_OF_CHUNKS) */
00422          put_le32(pb, avist->indexes.entry);
00423                                       /* nEntriesInUse */
00424          put_tag(pb, &tag[0]);        /* dwChunkId */
00425          put_le64(pb, avi->movi_list);/* qwBaseOffset */
00426          put_le32(pb, 0);             /* dwReserved_3 (must be 0) */
00427 
00428          for (j=0; j<avist->indexes.entry; j++) {
00429              AVIIentry* ie = avi_get_ientry(&avist->indexes, j);
00430              put_le32(pb, ie->pos + 8);
00431              put_le32(pb, ((uint32_t)ie->len & ~0x80000000) |
00432                           (ie->flags & 0x10 ? 0 : 0x80000000));
00433          }
00434          put_flush_packet(pb);
00435          pos = url_ftell(pb);
00436 
00437          /* Updating one entry in the AVI OpenDML master index */
00438          url_fseek(pb, avist->indexes.indx_start - 8, SEEK_SET);
00439          put_tag(pb, "indx");                 /* enabling this entry */
00440          url_fskip(pb, 8);
00441          put_le32(pb, avi->riff_id);          /* nEntriesInUse */
00442          url_fskip(pb, 16*avi->riff_id);
00443          put_le64(pb, ix);                    /* qwOffset */
00444          put_le32(pb, pos - ix);              /* dwSize */
00445          put_le32(pb, avist->indexes.entry); /* dwDuration */
00446 
00447          url_fseek(pb, pos, SEEK_SET);
00448     }
00449     return 0;
00450 }
00451 
00452 static int avi_write_idx1(AVFormatContext *s)
00453 {
00454     ByteIOContext *pb = s->pb;
00455     AVIContext *avi = s->priv_data;
00456     int64_t idx_chunk;
00457     int i;
00458     char tag[5];
00459 
00460     if (!url_is_streamed(pb)) {
00461         AVIStream *avist;
00462         AVIIentry* ie = 0, *tie;
00463         int empty, stream_id = -1;
00464 
00465         idx_chunk = ff_start_tag(pb, "idx1");
00466         for(i=0; i<s->nb_streams; i++){
00467             avist= s->streams[i]->priv_data;
00468             avist->entry=0;
00469         }
00470 
00471         do {
00472             empty = 1;
00473             for (i=0; i<s->nb_streams; i++) {
00474                 avist= s->streams[i]->priv_data;
00475                  if (avist->indexes.entry <= avist->entry)
00476                      continue;
00477 
00478                  tie = avi_get_ientry(&avist->indexes, avist->entry);
00479                  if (empty || tie->pos < ie->pos) {
00480                      ie = tie;
00481                      stream_id = i;
00482                  }
00483                  empty = 0;
00484             }
00485             if (!empty) {
00486                 avist= s->streams[stream_id]->priv_data;
00487                 avi_stream2fourcc(&tag[0], stream_id,
00488                                   s->streams[stream_id]->codec->codec_type);
00489                 put_tag(pb, &tag[0]);
00490                 put_le32(pb, ie->flags);
00491                 put_le32(pb, ie->pos);
00492                 put_le32(pb, ie->len);
00493                 avist->entry++;
00494             }
00495         } while (!empty);
00496         ff_end_tag(pb, idx_chunk);
00497 
00498         avi_write_counters(s, avi->riff_id);
00499     }
00500     return 0;
00501 }
00502 
00503 static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
00504 {
00505     AVIContext *avi = s->priv_data;
00506     ByteIOContext *pb = s->pb;
00507     unsigned char tag[5];
00508     unsigned int flags=0;
00509     const int stream_index= pkt->stream_index;
00510     AVIStream *avist= s->streams[stream_index]->priv_data;
00511     AVCodecContext *enc= s->streams[stream_index]->codec;
00512     int size= pkt->size;
00513 
00514 //    av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %d\n", pkt->dts, avi->packet_count[stream_index], stream_index);
00515     while(enc->block_align==0 && pkt->dts != AV_NOPTS_VALUE && pkt->dts > avist->packet_count){
00516         AVPacket empty_packet;
00517 
00518         av_init_packet(&empty_packet);
00519         empty_packet.size= 0;
00520         empty_packet.data= NULL;
00521         empty_packet.stream_index= stream_index;
00522         avi_write_packet(s, &empty_packet);
00523 //        av_log(s, AV_LOG_DEBUG, "dup %"PRId64" %d\n", pkt->dts, avi->packet_count[stream_index]);
00524     }
00525     avist->packet_count++;
00526 
00527     // Make sure to put an OpenDML chunk when the file size exceeds the limits
00528     if (!url_is_streamed(pb) &&
00529         (url_ftell(pb) - avi->riff_start > AVI_MAX_RIFF_SIZE)) {
00530 
00531         avi_write_ix(s);
00532         ff_end_tag(pb, avi->movi_list);
00533 
00534         if (avi->riff_id == 1)
00535             avi_write_idx1(s);
00536 
00537         ff_end_tag(pb, avi->riff_start);
00538         avi->movi_list = avi_start_new_riff(s, pb, "AVIX", "movi");
00539     }
00540 
00541     avi_stream2fourcc(&tag[0], stream_index, enc->codec_type);
00542     if(pkt->flags&AV_PKT_FLAG_KEY)
00543         flags = 0x10;
00544     if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
00545        avist->audio_strm_length += size;
00546     }
00547 
00548     if (!url_is_streamed(s->pb)) {
00549         AVIIndex* idx = &avist->indexes;
00550         int cl = idx->entry / AVI_INDEX_CLUSTER_SIZE;
00551         int id = idx->entry % AVI_INDEX_CLUSTER_SIZE;
00552         if (idx->ents_allocated <= idx->entry) {
00553             idx->cluster = av_realloc(idx->cluster, (cl+1)*sizeof(void*));
00554             if (!idx->cluster)
00555                 return -1;
00556             idx->cluster[cl] = av_malloc(AVI_INDEX_CLUSTER_SIZE*sizeof(AVIIentry));
00557             if (!idx->cluster[cl])
00558                 return -1;
00559             idx->ents_allocated += AVI_INDEX_CLUSTER_SIZE;
00560         }
00561 
00562         idx->cluster[cl][id].flags = flags;
00563         idx->cluster[cl][id].pos = url_ftell(pb) - avi->movi_list;
00564         idx->cluster[cl][id].len = size;
00565         idx->entry++;
00566     }
00567 
00568     put_buffer(pb, tag, 4);
00569     put_le32(pb, size);
00570     put_buffer(pb, pkt->data, size);
00571     if (size & 1)
00572         put_byte(pb, 0);
00573 
00574     put_flush_packet(pb);
00575     return 0;
00576 }
00577 
00578 static int avi_write_trailer(AVFormatContext *s)
00579 {
00580     AVIContext *avi = s->priv_data;
00581     ByteIOContext *pb = s->pb;
00582     int res = 0;
00583     int i, j, n, nb_frames;
00584     int64_t file_size;
00585 
00586     if (!url_is_streamed(pb)){
00587         if (avi->riff_id == 1) {
00588             ff_end_tag(pb, avi->movi_list);
00589             res = avi_write_idx1(s);
00590             ff_end_tag(pb, avi->riff_start);
00591         } else {
00592             avi_write_ix(s);
00593             ff_end_tag(pb, avi->movi_list);
00594             ff_end_tag(pb, avi->riff_start);
00595 
00596             file_size = url_ftell(pb);
00597             url_fseek(pb, avi->odml_list - 8, SEEK_SET);
00598             put_tag(pb, "LIST"); /* Making this AVI OpenDML one */
00599             url_fskip(pb, 16);
00600 
00601             for (n=nb_frames=0;n<s->nb_streams;n++) {
00602                 AVCodecContext *stream = s->streams[n]->codec;
00603                 AVIStream *avist= s->streams[n]->priv_data;
00604 
00605                 if (stream->codec_type == AVMEDIA_TYPE_VIDEO) {
00606                     if (nb_frames < avist->packet_count)
00607                         nb_frames = avist->packet_count;
00608                 } else {
00609                     if (stream->codec_id == CODEC_ID_MP2 || stream->codec_id == CODEC_ID_MP3) {
00610                         nb_frames += avist->packet_count;
00611                     }
00612                 }
00613             }
00614             put_le32(pb, nb_frames);
00615             url_fseek(pb, file_size, SEEK_SET);
00616 
00617             avi_write_counters(s, avi->riff_id);
00618         }
00619     }
00620     put_flush_packet(pb);
00621 
00622     for (i=0; i<s->nb_streams; i++) {
00623          AVIStream *avist= s->streams[i]->priv_data;
00624          for (j=0; j<avist->indexes.ents_allocated/AVI_INDEX_CLUSTER_SIZE; j++)
00625               av_free(avist->indexes.cluster[j]);
00626          av_freep(&avist->indexes.cluster);
00627          avist->indexes.ents_allocated = avist->indexes.entry = 0;
00628     }
00629 
00630     return res;
00631 }
00632 
00633 AVOutputFormat avi_muxer = {
00634     "avi",
00635     NULL_IF_CONFIG_SMALL("AVI format"),
00636     "video/x-msvideo",
00637     "avi",
00638     sizeof(AVIContext),
00639     CODEC_ID_MP2,
00640     CODEC_ID_MPEG4,
00641     avi_write_header,
00642     avi_write_packet,
00643     avi_write_trailer,
00644     .codec_tag= (const AVCodecTag* const []){ff_codec_bmp_tags, ff_codec_wav_tags, 0},
00645     .flags= AVFMT_VARIABLE_FPS,
00646 };