libavformat/avienc.c

   1 /*
   2  * AVI muxer
   3  * Copyright (c) 2000 Fabrice Bellard.
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21 #include "avformat.h"
  22 #include "avi.h"
  23 #include "riff.h"
  24
  25 /*
  26  * TODO:
  27  *  - fill all fields if non streamed (nb_frames for example)
  28  */
  29
  30 #ifdef CONFIG_AVI_MUXER
  31 typedef struct AVIIentry {
  32     unsigned int flags, pos, len;
  33 } AVIIentry;
  34
  35 #define AVI_INDEX_CLUSTER_SIZE 16384
  36
  37 typedef struct AVIIndex {
  38     int64_t     indx_start;
  39     int         entry;
  40     int         ents_allocated;
  41     AVIIentry** cluster;
  42 } AVIIndex;
  43
  44 typedef struct {
  45     int64_t riff_start, movi_list, odml_list;
  46     int64_t frames_hdr_all, frames_hdr_strm[MAX_STREAMS];
  47     int audio_strm_length[MAX_STREAMS];
  48     int riff_id;
  49     int packet_count[MAX_STREAMS];
  50
  51     AVIIndex indexes[MAX_STREAMS];
  52 } AVIContext;
  53
  54 static inline AVIIentry* avi_get_ientry(AVIIndex* idx, int ent_id)
  55 {
  56     int cl = ent_id / AVI_INDEX_CLUSTER_SIZE;
  57     int id = ent_id % AVI_INDEX_CLUSTER_SIZE;
  58     return &idx->cluster[cl][id];
  59 }
  60
  61 static int64_t avi_start_new_riff(AVIContext *avi, ByteIOContext *pb,
  62                                   const char* riff_tag, const char* list_tag)
  63 {
  64     int64_t loff;
  65     int i;
  66
  67     avi->riff_id++;
  68     for (i=0; i<MAX_STREAMS; i++)
  69          avi->indexes[i].entry = 0;
  70
  71     avi->riff_start = start_tag(pb, "RIFF");
  72     put_tag(pb, riff_tag);
  73     loff = start_tag(pb, "LIST");
  74     put_tag(pb, list_tag);
  75     return loff;
  76 }
  77
  78 static char* avi_stream2fourcc(char* tag, int index, enum CodecType type)
  79 {
  80     tag[0] = '0';
  81     tag[1] = '0' + index;
  82     if (type == CODEC_TYPE_VIDEO) {
  83         tag[2] = 'd';
  84         tag[3] = 'c';
  85     } else {
  86         tag[2] = 'w';
  87         tag[3] = 'b';
  88     }
  89     tag[4] = '\0';
  90     return tag;
  91 }
  92
  93 static void avi_write_info_tag(ByteIOContext *pb, const char *tag, const char *str)
  94 {
  95     int len = strlen(str);
  96     if (len > 0) {
  97         len++;
  98         put_tag(pb, tag);
  99         put_le32(pb, len);
 100         put_strz(pb, str);
 101         if (len & 1)
 102             put_byte(pb, 0);
 103     }
 104 }
 105
 106 static void avi_write_info_tag2(AVFormatContext *s, const char *fourcc, const char *key1, const char *key2)
 107 {
 108     AVMetadataTag *tag= av_metadata_get(s->metadata, key1, NULL, AV_METADATA_IGNORE_CASE);
 109     if(!tag && key2)
 110         tag= av_metadata_get(s->metadata, key2, NULL, AV_METADATA_IGNORE_CASE);
 111     if(tag)
 112         avi_write_info_tag(s->pb, fourcc, tag->value);
 113 }
 114
 115 static int avi_write_counters(AVFormatContext* s, int riff_id)
 116 {
 117     ByteIOContext *pb = s->pb;
 118     AVIContext *avi = s->priv_data;
 119     int n, au_byterate, au_ssize, au_scale, nb_frames = 0;
 120     int64_t file_size;
 121     AVCodecContext* stream;
 122
 123     file_size = url_ftell(pb);
 124     for(n = 0; n < s->nb_streams; n++) {
 125         assert(avi->frames_hdr_strm[n]);
 126         stream = s->streams[n]->codec;
 127         url_fseek(pb, avi->frames_hdr_strm[n], SEEK_SET);
 128         ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
 129         if(au_ssize == 0) {
 130             put_le32(pb, avi->packet_count[n]);
 131         } else {
 132             put_le32(pb, avi->audio_strm_length[n] / au_ssize);
 133         }
 134         if(stream->codec_type == CODEC_TYPE_VIDEO)
 135             nb_frames = FFMAX(nb_frames, avi->packet_count[n]);
 136     }
 137     if(riff_id == 1) {
 138         assert(avi->frames_hdr_all);
 139         url_fseek(pb, avi->frames_hdr_all, SEEK_SET);
 140         put_le32(pb, nb_frames);
 141     }
 142     url_fseek(pb, file_size, SEEK_SET);
 143
 144     return 0;
 145 }
 146
 147 static int avi_write_header(AVFormatContext *s)
 148 {
 149     AVIContext *avi = s->priv_data;
 150     ByteIOContext *pb = s->pb;
 151     int bitrate, n, i, nb_frames, au_byterate, au_ssize, au_scale;
 152     AVCodecContext *stream, *video_enc;
 153     int64_t list1, list2, strh, strf;
 154
 155     /* header list */
 156     avi->riff_id = 0;
 157     list1 = avi_start_new_riff(avi, pb, "AVI ", "hdrl");
 158
 159     /* avi header */
 160     put_tag(pb, "avih");
 161     put_le32(pb, 14 * 4);
 162     bitrate = 0;
 163
 164     video_enc = NULL;
 165     for(n=0;n<s->nb_streams;n++) {
 166         stream = s->streams[n]->codec;
 167         bitrate += stream->bit_rate;
 168         if (stream->codec_type == CODEC_TYPE_VIDEO)
 169             video_enc = stream;
 170     }
 171
 172     nb_frames = 0;
 173
 174     if(video_enc){
 175         put_le32(pb, (uint32_t)(INT64_C(1000000) * video_enc->time_base.num / video_enc->time_base.den));
 176     } else {
 177         put_le32(pb, 0);
 178     }
 179     put_le32(pb, bitrate / 8); /* XXX: not quite exact */
 180     put_le32(pb, 0); /* padding */
 181     if (url_is_streamed(pb))
 182         put_le32(pb, AVIF_TRUSTCKTYPE | AVIF_ISINTERLEAVED); /* flags */
 183     else
 184         put_le32(pb, AVIF_TRUSTCKTYPE | AVIF_HASINDEX | AVIF_ISINTERLEAVED); /* flags */
 185     avi->frames_hdr_all = url_ftell(pb); /* remember this offset to fill later */
 186     put_le32(pb, nb_frames); /* nb frames, filled later */
 187     put_le32(pb, 0); /* initial frame */
 188     put_le32(pb, s->nb_streams); /* nb streams */
 189     put_le32(pb, 1024 * 1024); /* suggested buffer size */
 190     if(video_enc){
 191         put_le32(pb, video_enc->width);
 192         put_le32(pb, video_enc->height);
 193     } else {
 194         put_le32(pb, 0);
 195         put_le32(pb, 0);
 196     }
 197     put_le32(pb, 0); /* reserved */
 198     put_le32(pb, 0); /* reserved */
 199     put_le32(pb, 0); /* reserved */
 200     put_le32(pb, 0); /* reserved */
 201
 202     /* stream list */
 203     for(i=0;i<n;i++) {
 204         list2 = start_tag(pb, "LIST");
 205         put_tag(pb, "strl");
 206
 207         stream = s->streams[i]->codec;
 208
 209         /* stream generic header */
 210         strh = start_tag(pb, "strh");
 211         switch(stream->codec_type) {
 212         case CODEC_TYPE_VIDEO: put_tag(pb, "vids"); break;
 213         case CODEC_TYPE_AUDIO: put_tag(pb, "auds"); break;
 214 //        case CODEC_TYPE_TEXT : put_tag(pb, "txts"); break;
 215         case CODEC_TYPE_DATA : put_tag(pb, "dats"); break;
 216         }
 217         if(stream->codec_type == CODEC_TYPE_VIDEO)
 218             put_le32(pb, stream->codec_tag);
 219         else
 220             put_le32(pb, 1);
 221         put_le32(pb, 0); /* flags */
 222         put_le16(pb, 0); /* priority */
 223         put_le16(pb, 0); /* language */
 224         put_le32(pb, 0); /* initial frame */
 225
 226         ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
 227
 228         put_le32(pb, au_scale); /* scale */
 229         put_le32(pb, au_byterate); /* rate */
 230         av_set_pts_info(s->streams[i], 64, au_scale, au_byterate);
 231
 232         put_le32(pb, 0); /* start */
 233         avi->frames_hdr_strm[i] = url_ftell(pb); /* remember this offset to fill later */
 234         if (url_is_streamed(pb))
 235             put_le32(pb, AVI_MAX_RIFF_SIZE); /* FIXME: this may be broken, but who cares */
 236         else
 237             put_le32(pb, 0); /* length, XXX: filled later */
 238
 239         /* suggested buffer size */ //FIXME set at the end to largest chunk
 240         if(stream->codec_type == CODEC_TYPE_VIDEO)
 241             put_le32(pb, 1024 * 1024);
 242         else if(stream->codec_type == CODEC_TYPE_AUDIO)
 243             put_le32(pb, 12 * 1024);
 244         else
 245             put_le32(pb, 0);
 246         put_le32(pb, -1); /* quality */
 247         put_le32(pb, au_ssize); /* sample size */
 248         put_le32(pb, 0);
 249         put_le16(pb, stream->width);
 250         put_le16(pb, stream->height);
 251         end_tag(pb, strh);
 252
 253       if(stream->codec_type != CODEC_TYPE_DATA){
 254         strf = start_tag(pb, "strf");
 255         switch(stream->codec_type) {
 256         case CODEC_TYPE_VIDEO:
 257             put_bmp_header(pb, stream, codec_bmp_tags, 0);
 258             break;
 259         case CODEC_TYPE_AUDIO:
 260             if (put_wav_header(pb, stream) < 0) {
 261                 return -1;
 262             }
 263             break;
 264         default:
 265             return -1;
 266         }
 267         end_tag(pb, strf);
 268       }
 269
 270         if (!url_is_streamed(pb)) {
 271             unsigned char tag[5];
 272             int j;
 273
 274             /* Starting to lay out AVI OpenDML master index.
 275              * We want to make it JUNK entry for now, since we'd
 276              * like to get away without making AVI an OpenDML one
 277              * for compatibility reasons.
 278              */
 279             avi->indexes[i].entry = avi->indexes[i].ents_allocated = 0;
 280             avi->indexes[i].indx_start = start_tag(pb, "JUNK");
 281             put_le16(pb, 4);        /* wLongsPerEntry */
 282             put_byte(pb, 0);        /* bIndexSubType (0 == frame index) */
 283             put_byte(pb, 0);        /* bIndexType (0 == AVI_INDEX_OF_INDEXES) */
 284             put_le32(pb, 0);        /* nEntriesInUse (will fill out later on) */
 285             put_tag(pb, avi_stream2fourcc(&tag[0], i, stream->codec_type));
 286                                     /* dwChunkId */
 287             put_le64(pb, 0);        /* dwReserved[3]
 288             put_le32(pb, 0);           Must be 0.    */
 289             for (j=0; j < AVI_MASTER_INDEX_SIZE * 2; j++)
 290                  put_le64(pb, 0);
 291             end_tag(pb, avi->indexes[i].indx_start);
 292         }
 293
 294         if(   stream->codec_type == CODEC_TYPE_VIDEO
 295            && s->streams[i]->sample_aspect_ratio.num>0
 296            && s->streams[i]->sample_aspect_ratio.den>0){
 297             int vprp= start_tag(pb, "vprp");
 298             AVRational dar = av_mul_q(s->streams[i]->sample_aspect_ratio,
 299                                       (AVRational){stream->width, stream->height});
 300             int num, den;
 301             av_reduce(&num, &den, dar.num, dar.den, 0xFFFF);
 302
 303             put_le32(pb, 0); //video format  = unknown
 304             put_le32(pb, 0); //video standard= unknown
 305             put_le32(pb, lrintf(1.0/av_q2d(stream->time_base)));
 306             put_le32(pb, stream->width );
 307             put_le32(pb, stream->height);
 308             put_le16(pb, den);
 309             put_le16(pb, num);
 310             put_le32(pb, stream->width );
 311             put_le32(pb, stream->height);
 312             put_le32(pb, 1); //progressive FIXME
 313
 314             put_le32(pb, stream->height);
 315             put_le32(pb, stream->width );
 316             put_le32(pb, stream->height);
 317             put_le32(pb, stream->width );
 318             put_le32(pb, 0);
 319             put_le32(pb, 0);
 320
 321             put_le32(pb, 0);
 322             put_le32(pb, 0);
 323             end_tag(pb, vprp);
 324         }
 325
 326         end_tag(pb, list2);
 327     }
 328
 329     if (!url_is_streamed(pb)) {
 330         /* AVI could become an OpenDML one, if it grows beyond 2Gb range */
 331         avi->odml_list = start_tag(pb, "JUNK");
 332         put_tag(pb, "odml");
 333         put_tag(pb, "dmlh");
 334         put_le32(pb, 248);
 335         for (i = 0; i < 248; i+= 4)
 336              put_le32(pb, 0);
 337         end_tag(pb, avi->odml_list);
 338     }
 339
 340     end_tag(pb, list1);
 341
 342     list2 = start_tag(pb, "LIST");
 343     put_tag(pb, "INFO");
 344     avi_write_info_tag2(s, "INAM", "Title", NULL);
 345     avi_write_info_tag2(s, "IART", "Artist", "Author");
 346     avi_write_info_tag2(s, "ICOP", "Copyright", NULL);
 347     avi_write_info_tag2(s, "ICMT", "Comment", NULL);
 348     avi_write_info_tag2(s, "IPRD", "Album", NULL);
 349     avi_write_info_tag2(s, "IGNR", "Genre", NULL);
 350     avi_write_info_tag2(s, "IPRT", "Track", NULL);
 351     if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
 352         avi_write_info_tag(pb, "ISFT", LIBAVFORMAT_IDENT);
 353     end_tag(pb, list2);
 354
 355     /* some padding for easier tag editing */
 356     list2 = start_tag(pb, "JUNK");
 357     for (i = 0; i < 1016; i += 4)
 358         put_le32(pb, 0);
 359     end_tag(pb, list2);
 360
 361     avi->movi_list = start_tag(pb, "LIST");
 362     put_tag(pb, "movi");
 363
 364     put_flush_packet(pb);
 365
 366     return 0;
 367 }
 368
 369 static int avi_write_ix(AVFormatContext *s)
 370 {
 371     ByteIOContext *pb = s->pb;
 372     AVIContext *avi = s->priv_data;
 373     char tag[5];
 374     char ix_tag[] = "ix00";
 375     int i, j;
 376
 377     assert(!url_is_streamed(pb));
 378
 379     if (avi->riff_id > AVI_MASTER_INDEX_SIZE)
 380         return -1;
 381
 382     for (i=0;i<s->nb_streams;i++) {
 383          int64_t ix, pos;
 384
 385          avi_stream2fourcc(&tag[0], i, s->streams[i]->codec->codec_type);
 386          ix_tag[3] = '0' + i;
 387
 388          /* Writing AVI OpenDML leaf index chunk */
 389          ix = url_ftell(pb);
 390          put_tag(pb, &ix_tag[0]);     /* ix?? */
 391          put_le32(pb, avi->indexes[i].entry * 8 + 24);
 392                                       /* chunk size */
 393          put_le16(pb, 2);             /* wLongsPerEntry */
 394          put_byte(pb, 0);             /* bIndexSubType (0 == frame index) */
 395          put_byte(pb, 1);             /* bIndexType (1 == AVI_INDEX_OF_CHUNKS) */
 396          put_le32(pb, avi->indexes[i].entry);
 397                                       /* nEntriesInUse */
 398          put_tag(pb, &tag[0]);        /* dwChunkId */
 399          put_le64(pb, avi->movi_list);/* qwBaseOffset */
 400          put_le32(pb, 0);             /* dwReserved_3 (must be 0) */
 401
 402          for (j=0; j<avi->indexes[i].entry; j++) {
 403              AVIIentry* ie = avi_get_ientry(&avi->indexes[i], j);
 404              put_le32(pb, ie->pos + 8);
 405              put_le32(pb, ((uint32_t)ie->len & ~0x80000000) |
 406                           (ie->flags & 0x10 ? 0 : 0x80000000));
 407          }
 408          put_flush_packet(pb);
 409          pos = url_ftell(pb);
 410
 411          /* Updating one entry in the AVI OpenDML master index */
 412          url_fseek(pb, avi->indexes[i].indx_start - 8, SEEK_SET);
 413          put_tag(pb, "indx");                 /* enabling this entry */
 414          url_fskip(pb, 8);
 415          put_le32(pb, avi->riff_id);          /* nEntriesInUse */
 416          url_fskip(pb, 16*avi->riff_id);
 417          put_le64(pb, ix);                    /* qwOffset */
 418          put_le32(pb, pos - ix);              /* dwSize */
 419          put_le32(pb, avi->indexes[i].entry); /* dwDuration */
 420
 421          url_fseek(pb, pos, SEEK_SET);
 422     }
 423     return 0;
 424 }
 425
 426 static int avi_write_idx1(AVFormatContext *s)
 427 {
 428     ByteIOContext *pb = s->pb;
 429     AVIContext *avi = s->priv_data;
 430     int64_t idx_chunk;
 431     int i;
 432     char tag[5];
 433
 434     if (!url_is_streamed(pb)) {
 435         AVIIentry* ie = 0, *tie;
 436         int entry[MAX_STREAMS];
 437         int empty, stream_id = -1;
 438
 439         idx_chunk = start_tag(pb, "idx1");
 440         memset(&entry[0], 0, sizeof(entry));
 441         do {
 442             empty = 1;
 443             for (i=0; i<s->nb_streams; i++) {
 444                  if (avi->indexes[i].entry <= entry[i])
 445                      continue;
 446
 447                  tie = avi_get_ientry(&avi->indexes[i], entry[i]);
 448                  if (empty || tie->pos < ie->pos) {
 449                      ie = tie;
 450                      stream_id = i;
 451                  }
 452                  empty = 0;
 453             }
 454             if (!empty) {
 455                 avi_stream2fourcc(&tag[0], stream_id,
 456                                   s->streams[stream_id]->codec->codec_type);
 457                 put_tag(pb, &tag[0]);
 458                 put_le32(pb, ie->flags);
 459                 put_le32(pb, ie->pos);
 460                 put_le32(pb, ie->len);
 461                 entry[stream_id]++;
 462             }
 463         } while (!empty);
 464         end_tag(pb, idx_chunk);
 465
 466         avi_write_counters(s, avi->riff_id);
 467     }
 468     return 0;
 469 }
 470
 471 static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
 472 {
 473     AVIContext *avi = s->priv_data;
 474     ByteIOContext *pb = s->pb;
 475     unsigned char tag[5];
 476     unsigned int flags=0;
 477     const int stream_index= pkt->stream_index;
 478     AVCodecContext *enc= s->streams[stream_index]->codec;
 479     int size= pkt->size;
 480
 481 //    av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %d\n", pkt->dts, avi->packet_count[stream_index], stream_index);
 482     while(enc->block_align==0 && pkt->dts != AV_NOPTS_VALUE && pkt->dts > avi->packet_count[stream_index]){
 483         AVPacket empty_packet;
 484
 485         av_init_packet(&empty_packet);
 486         empty_packet.size= 0;
 487         empty_packet.data= NULL;
 488         empty_packet.stream_index= stream_index;
 489         avi_write_packet(s, &empty_packet);
 490 //        av_log(s, AV_LOG_DEBUG, "dup %"PRId64" %d\n", pkt->dts, avi->packet_count[stream_index]);
 491     }
 492     avi->packet_count[stream_index]++;
 493
 494     // Make sure to put an OpenDML chunk when the file size exceeds the limits
 495     if (!url_is_streamed(pb) &&
 496         (url_ftell(pb) - avi->riff_start > AVI_MAX_RIFF_SIZE)) {
 497
 498         avi_write_ix(s);
 499         end_tag(pb, avi->movi_list);
 500
 501         if (avi->riff_id == 1)
 502             avi_write_idx1(s);
 503
 504         end_tag(pb, avi->riff_start);
 505         avi->movi_list = avi_start_new_riff(avi, pb, "AVIX", "movi");
 506     }
 507
 508     avi_stream2fourcc(&tag[0], stream_index, enc->codec_type);
 509     if(pkt->flags&PKT_FLAG_KEY)
 510         flags = 0x10;
 511     if (enc->codec_type == CODEC_TYPE_AUDIO) {
 512        avi->audio_strm_length[stream_index] += size;
 513     }
 514
 515     if (!url_is_streamed(s->pb)) {
 516         AVIIndex* idx = &avi->indexes[stream_index];
 517         int cl = idx->entry / AVI_INDEX_CLUSTER_SIZE;
 518         int id = idx->entry % AVI_INDEX_CLUSTER_SIZE;
 519         if (idx->ents_allocated <= idx->entry) {
 520             idx->cluster = av_realloc(idx->cluster, (cl+1)*sizeof(void*));
 521             if (!idx->cluster)
 522                 return -1;
 523             idx->cluster[cl] = av_malloc(AVI_INDEX_CLUSTER_SIZE*sizeof(AVIIentry));
 524             if (!idx->cluster[cl])
 525                 return -1;
 526             idx->ents_allocated += AVI_INDEX_CLUSTER_SIZE;
 527         }
 528
 529         idx->cluster[cl][id].flags = flags;
 530         idx->cluster[cl][id].pos = url_ftell(pb) - avi->movi_list;
 531         idx->cluster[cl][id].len = size;
 532         idx->entry++;
 533     }
 534
 535     put_buffer(pb, tag, 4);
 536     put_le32(pb, size);
 537     put_buffer(pb, pkt->data, size);
 538     if (size & 1)
 539         put_byte(pb, 0);
 540
 541     put_flush_packet(pb);
 542     return 0;
 543 }
 544
 545 static int avi_write_trailer(AVFormatContext *s)
 546 {
 547     AVIContext *avi = s->priv_data;
 548     ByteIOContext *pb = s->pb;
 549     int res = 0;
 550     int i, j, n, nb_frames;
 551     int64_t file_size;
 552
 553     if (!url_is_streamed(pb)){
 554         if (avi->riff_id == 1) {
 555             end_tag(pb, avi->movi_list);
 556             res = avi_write_idx1(s);
 557             end_tag(pb, avi->riff_start);
 558         } else {
 559             avi_write_ix(s);
 560             end_tag(pb, avi->movi_list);
 561             end_tag(pb, avi->riff_start);
 562
 563             file_size = url_ftell(pb);
 564             url_fseek(pb, avi->odml_list - 8, SEEK_SET);
 565             put_tag(pb, "LIST"); /* Making this AVI OpenDML one */
 566             url_fskip(pb, 16);
 567
 568             for (n=nb_frames=0;n<s->nb_streams;n++) {
 569                 AVCodecContext *stream = s->streams[n]->codec;
 570                 if (stream->codec_type == CODEC_TYPE_VIDEO) {
 571                     if (nb_frames < avi->packet_count[n])
 572                         nb_frames = avi->packet_count[n];
 573                 } else {
 574                     if (stream->codec_id == CODEC_ID_MP2 || stream->codec_id == CODEC_ID_MP3) {
 575                         nb_frames += avi->packet_count[n];
 576                     }
 577                 }
 578             }
 579             put_le32(pb, nb_frames);
 580             url_fseek(pb, file_size, SEEK_SET);
 581
 582             avi_write_counters(s, avi->riff_id);
 583         }
 584     }
 585     put_flush_packet(pb);
 586
 587     for (i=0; i<MAX_STREAMS; i++) {
 588          for (j=0; j<avi->indexes[i].ents_allocated/AVI_INDEX_CLUSTER_SIZE; j++)
 589               av_free(avi->indexes[i].cluster[j]);
 590          av_free(avi->indexes[i].cluster);
 591          avi->indexes[i].cluster = NULL;
 592          avi->indexes[i].ents_allocated = avi->indexes[i].entry = 0;
 593     }
 594
 595     return res;
 596 }
 597
 598 AVOutputFormat avi_muxer = {
 599     "avi",
 600     NULL_IF_CONFIG_SMALL("AVI format"),
 601     "video/x-msvideo",
 602     "avi",
 603     sizeof(AVIContext),
 604     CODEC_ID_MP2,
 605     CODEC_ID_MPEG4,
 606     avi_write_header,
 607     avi_write_packet,
 608     avi_write_trailer,
 609     .codec_tag= (const AVCodecTag* const []){codec_bmp_tags, codec_wav_tags, 0},
 610 };
 611 #endif //CONFIG_AVI_MUXER