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     offset_t    indx_start;
  39     int         entry;
  40     int         ents_allocated;
  41     AVIIentry** cluster;
  42 } AVIIndex;
  43
  44 typedef struct {
  45     offset_t riff_start, movi_list, odml_list;
  46     offset_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 offset_t avi_start_new_riff(AVIContext *avi, ByteIOContext *pb,
  62                                    const char* riff_tag, const char* list_tag)
  63 {
  64     offset_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 int avi_write_counters(AVFormatContext* s, int riff_id)
 107 {
 108     ByteIOContext *pb = s->pb;
 109     AVIContext *avi = s->priv_data;
 110     int n, au_byterate, au_ssize, au_scale, nb_frames = 0;
 111     offset_t file_size;
 112     AVCodecContext* stream;
 113
 114     file_size = url_ftell(pb);
 115     for(n = 0; n < s->nb_streams; n++) {
 116         assert(avi->frames_hdr_strm[n]);
 117         stream = s->streams[n]->codec;
 118         url_fseek(pb, avi->frames_hdr_strm[n], SEEK_SET);
 119         ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
 120         if(au_ssize == 0) {
 121             put_le32(pb, avi->packet_count[n]);
 122         } else {
 123             put_le32(pb, avi->audio_strm_length[n] / au_ssize);
 124         }
 125         if(stream->codec_type == CODEC_TYPE_VIDEO)
 126             nb_frames = FFMAX(nb_frames, avi->packet_count[n]);
 127     }
 128     if(riff_id == 1) {
 129         assert(avi->frames_hdr_all);
 130         url_fseek(pb, avi->frames_hdr_all, SEEK_SET);
 131         put_le32(pb, nb_frames);
 132     }
 133     url_fseek(pb, file_size, SEEK_SET);
 134
 135     return 0;
 136 }
 137
 138 static int avi_write_header(AVFormatContext *s)
 139 {
 140     AVIContext *avi = s->priv_data;
 141     ByteIOContext *pb = s->pb;
 142     int bitrate, n, i, nb_frames, au_byterate, au_ssize, au_scale;
 143     AVCodecContext *stream, *video_enc;
 144     offset_t list1, list2, strh, strf;
 145
 146     /* header list */
 147     avi->riff_id = 0;
 148     list1 = avi_start_new_riff(avi, pb, "AVI ", "hdrl");
 149
 150     /* avi header */
 151     put_tag(pb, "avih");
 152     put_le32(pb, 14 * 4);
 153     bitrate = 0;
 154
 155     video_enc = NULL;
 156     for(n=0;n<s->nb_streams;n++) {
 157         stream = s->streams[n]->codec;
 158         bitrate += stream->bit_rate;
 159         if (stream->codec_type == CODEC_TYPE_VIDEO)
 160             video_enc = stream;
 161     }
 162
 163     nb_frames = 0;
 164
 165     if(video_enc){
 166         put_le32(pb, (uint32_t)(INT64_C(1000000) * video_enc->time_base.num / video_enc->time_base.den));
 167     } else {
 168         put_le32(pb, 0);
 169     }
 170     put_le32(pb, bitrate / 8); /* XXX: not quite exact */
 171     put_le32(pb, 0); /* padding */
 172     if (url_is_streamed(pb))
 173         put_le32(pb, AVIF_TRUSTCKTYPE | AVIF_ISINTERLEAVED); /* flags */
 174     else
 175         put_le32(pb, AVIF_TRUSTCKTYPE | AVIF_HASINDEX | AVIF_ISINTERLEAVED); /* flags */
 176     avi->frames_hdr_all = url_ftell(pb); /* remember this offset to fill later */
 177     put_le32(pb, nb_frames); /* nb frames, filled later */
 178     put_le32(pb, 0); /* initial frame */
 179     put_le32(pb, s->nb_streams); /* nb streams */
 180     put_le32(pb, 1024 * 1024); /* suggested buffer size */
 181     if(video_enc){
 182         put_le32(pb, video_enc->width);
 183         put_le32(pb, video_enc->height);
 184     } else {
 185         put_le32(pb, 0);
 186         put_le32(pb, 0);
 187     }
 188     put_le32(pb, 0); /* reserved */
 189     put_le32(pb, 0); /* reserved */
 190     put_le32(pb, 0); /* reserved */
 191     put_le32(pb, 0); /* reserved */
 192
 193     /* stream list */
 194     for(i=0;i<n;i++) {
 195         list2 = start_tag(pb, "LIST");
 196         put_tag(pb, "strl");
 197
 198         stream = s->streams[i]->codec;
 199
 200         /* stream generic header */
 201         strh = start_tag(pb, "strh");
 202         switch(stream->codec_type) {
 203         case CODEC_TYPE_VIDEO: put_tag(pb, "vids"); break;
 204         case CODEC_TYPE_AUDIO: put_tag(pb, "auds"); break;
 205 //        case CODEC_TYPE_TEXT : put_tag(pb, "txts"); break;
 206         case CODEC_TYPE_DATA : put_tag(pb, "dats"); break;
 207         }
 208         if(stream->codec_type == CODEC_TYPE_VIDEO)
 209             put_le32(pb, stream->codec_tag);
 210         else
 211             put_le32(pb, 1);
 212         put_le32(pb, 0); /* flags */
 213         put_le16(pb, 0); /* priority */
 214         put_le16(pb, 0); /* language */
 215         put_le32(pb, 0); /* initial frame */
 216
 217         ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
 218
 219         put_le32(pb, au_scale); /* scale */
 220         put_le32(pb, au_byterate); /* rate */
 221         av_set_pts_info(s->streams[i], 64, au_scale, au_byterate);
 222
 223         put_le32(pb, 0); /* start */
 224         avi->frames_hdr_strm[i] = url_ftell(pb); /* remember this offset to fill later */
 225         if (url_is_streamed(pb))
 226             put_le32(pb, AVI_MAX_RIFF_SIZE); /* FIXME: this may be broken, but who cares */
 227         else
 228             put_le32(pb, 0); /* length, XXX: filled later */
 229
 230         /* suggested buffer size */ //FIXME set at the end to largest chunk
 231         if(stream->codec_type == CODEC_TYPE_VIDEO)
 232             put_le32(pb, 1024 * 1024);
 233         else if(stream->codec_type == CODEC_TYPE_AUDIO)
 234             put_le32(pb, 12 * 1024);
 235         else
 236             put_le32(pb, 0);
 237         put_le32(pb, -1); /* quality */
 238         put_le32(pb, au_ssize); /* sample size */
 239         put_le32(pb, 0);
 240         put_le16(pb, stream->width);
 241         put_le16(pb, stream->height);
 242         end_tag(pb, strh);
 243
 244       if(stream->codec_type != CODEC_TYPE_DATA){
 245         strf = start_tag(pb, "strf");
 246         switch(stream->codec_type) {
 247         case CODEC_TYPE_VIDEO:
 248             put_bmp_header(pb, stream, codec_bmp_tags, 0);
 249             break;
 250         case CODEC_TYPE_AUDIO:
 251             if (put_wav_header(pb, stream) < 0) {
 252                 av_free(avi);
 253                 return -1;
 254             }
 255             break;
 256         default:
 257             return -1;
 258         }
 259         end_tag(pb, strf);
 260       }
 261
 262         if (!url_is_streamed(pb)) {
 263             unsigned char tag[5];
 264             int j;
 265
 266             /* Starting to lay out AVI OpenDML master index.
 267              * We want to make it JUNK entry for now, since we'd
 268              * like to get away without making AVI an OpenDML one
 269              * for compatibility reasons.
 270              */
 271             avi->indexes[i].entry = avi->indexes[i].ents_allocated = 0;
 272             avi->indexes[i].indx_start = start_tag(pb, "JUNK");
 273             put_le16(pb, 4);        /* wLongsPerEntry */
 274             put_byte(pb, 0);        /* bIndexSubType (0 == frame index) */
 275             put_byte(pb, 0);        /* bIndexType (0 == AVI_INDEX_OF_INDEXES) */
 276             put_le32(pb, 0);        /* nEntriesInUse (will fill out later on) */
 277             put_tag(pb, avi_stream2fourcc(&tag[0], i, stream->codec_type));
 278                                     /* dwChunkId */
 279             put_le64(pb, 0);        /* dwReserved[3]
 280             put_le32(pb, 0);           Must be 0.    */
 281             for (j=0; j < AVI_MASTER_INDEX_SIZE * 2; j++)
 282                  put_le64(pb, 0);
 283             end_tag(pb, avi->indexes[i].indx_start);
 284         }
 285
 286         if(   stream->codec_type == CODEC_TYPE_VIDEO
 287            && stream->sample_aspect_ratio.num>0
 288            && stream->sample_aspect_ratio.den>0){
 289             int vprp= start_tag(pb, "vprp");
 290             AVRational dar = av_mul_q(stream->sample_aspect_ratio,
 291                                       (AVRational){stream->width, stream->height});
 292             int num, den;
 293             av_reduce(&num, &den, dar.num, dar.den, 0xFFFF);
 294
 295             put_le32(pb, 0); //video format  = unknown
 296             put_le32(pb, 0); //video standard= unknown
 297             put_le32(pb, lrintf(1.0/av_q2d(stream->time_base)));
 298             put_le32(pb, stream->width );
 299             put_le32(pb, stream->height);
 300             put_le16(pb, den);
 301             put_le16(pb, num);
 302             put_le32(pb, stream->width );
 303             put_le32(pb, stream->height);
 304             put_le32(pb, 1); //progressive FIXME
 305
 306             put_le32(pb, stream->height);
 307             put_le32(pb, stream->width );
 308             put_le32(pb, stream->height);
 309             put_le32(pb, stream->width );
 310             put_le32(pb, 0);
 311             put_le32(pb, 0);
 312
 313             put_le32(pb, 0);
 314             put_le32(pb, 0);
 315             end_tag(pb, vprp);
 316         }
 317
 318         end_tag(pb, list2);
 319     }
 320
 321     if (!url_is_streamed(pb)) {
 322         /* AVI could become an OpenDML one, if it grows beyond 2Gb range */
 323         avi->odml_list = start_tag(pb, "JUNK");
 324         put_tag(pb, "odml");
 325         put_tag(pb, "dmlh");
 326         put_le32(pb, 248);
 327         for (i = 0; i < 248; i+= 4)
 328              put_le32(pb, 0);
 329         end_tag(pb, avi->odml_list);
 330     }
 331
 332     end_tag(pb, list1);
 333
 334     list2 = start_tag(pb, "LIST");
 335     put_tag(pb, "INFO");
 336     avi_write_info_tag(pb, "INAM", s->title);
 337     avi_write_info_tag(pb, "IART", s->author);
 338     avi_write_info_tag(pb, "ICOP", s->copyright);
 339     avi_write_info_tag(pb, "ICMT", s->comment);
 340     avi_write_info_tag(pb, "IPRD", s->album);
 341     avi_write_info_tag(pb, "IGNR", s->genre);
 342     if (s->track) {
 343         char str_track[4];
 344         snprintf(str_track, 4, "%d", s->track);
 345         avi_write_info_tag(pb, "IPRT", str_track);
 346     }
 347     if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
 348         avi_write_info_tag(pb, "ISFT", LIBAVFORMAT_IDENT);
 349     end_tag(pb, list2);
 350
 351     /* some padding for easier tag editing */
 352     list2 = start_tag(pb, "JUNK");
 353     for (i = 0; i < 1016; i += 4)
 354         put_le32(pb, 0);
 355     end_tag(pb, list2);
 356
 357     avi->movi_list = start_tag(pb, "LIST");
 358     put_tag(pb, "movi");
 359
 360     put_flush_packet(pb);
 361
 362     return 0;
 363 }
 364
 365 static int avi_write_ix(AVFormatContext *s)
 366 {
 367     ByteIOContext *pb = s->pb;
 368     AVIContext *avi = s->priv_data;
 369     char tag[5];
 370     char ix_tag[] = "ix00";
 371     int i, j;
 372
 373     assert(!url_is_streamed(pb));
 374
 375     if (avi->riff_id > AVI_MASTER_INDEX_SIZE)
 376         return -1;
 377
 378     for (i=0;i<s->nb_streams;i++) {
 379          offset_t ix, pos;
 380
 381          avi_stream2fourcc(&tag[0], i, s->streams[i]->codec->codec_type);
 382          ix_tag[3] = '0' + i;
 383
 384          /* Writing AVI OpenDML leaf index chunk */
 385          ix = url_ftell(pb);
 386          put_tag(pb, &ix_tag[0]);     /* ix?? */
 387          put_le32(pb, avi->indexes[i].entry * 8 + 24);
 388                                       /* chunk size */
 389          put_le16(pb, 2);             /* wLongsPerEntry */
 390          put_byte(pb, 0);             /* bIndexSubType (0 == frame index) */
 391          put_byte(pb, 1);             /* bIndexType (1 == AVI_INDEX_OF_CHUNKS) */
 392          put_le32(pb, avi->indexes[i].entry);
 393                                       /* nEntriesInUse */
 394          put_tag(pb, &tag[0]);        /* dwChunkId */
 395          put_le64(pb, avi->movi_list);/* qwBaseOffset */
 396          put_le32(pb, 0);             /* dwReserved_3 (must be 0) */
 397
 398          for (j=0; j<avi->indexes[i].entry; j++) {
 399              AVIIentry* ie = avi_get_ientry(&avi->indexes[i], j);
 400              put_le32(pb, ie->pos + 8);
 401              put_le32(pb, ((uint32_t)ie->len & ~0x80000000) |
 402                           (ie->flags & 0x10 ? 0 : 0x80000000));
 403          }
 404          put_flush_packet(pb);
 405          pos = url_ftell(pb);
 406
 407          /* Updating one entry in the AVI OpenDML master index */
 408          url_fseek(pb, avi->indexes[i].indx_start - 8, SEEK_SET);
 409          put_tag(pb, "indx");                 /* enabling this entry */
 410          url_fskip(pb, 8);
 411          put_le32(pb, avi->riff_id);          /* nEntriesInUse */
 412          url_fskip(pb, 16*avi->riff_id);
 413          put_le64(pb, ix);                    /* qwOffset */
 414          put_le32(pb, pos - ix);              /* dwSize */
 415          put_le32(pb, avi->indexes[i].entry); /* dwDuration */
 416
 417          url_fseek(pb, pos, SEEK_SET);
 418     }
 419     return 0;
 420 }
 421
 422 static int avi_write_idx1(AVFormatContext *s)
 423 {
 424     ByteIOContext *pb = s->pb;
 425     AVIContext *avi = s->priv_data;
 426     offset_t idx_chunk;
 427     int i;
 428     char tag[5];
 429
 430     if (!url_is_streamed(pb)) {
 431         AVIIentry* ie = 0, *tie;
 432         int entry[MAX_STREAMS];
 433         int empty, stream_id = -1;
 434
 435         idx_chunk = start_tag(pb, "idx1");
 436         memset(&entry[0], 0, sizeof(entry));
 437         do {
 438             empty = 1;
 439             for (i=0; i<s->nb_streams; i++) {
 440                  if (avi->indexes[i].entry <= entry[i])
 441                      continue;
 442
 443                  tie = avi_get_ientry(&avi->indexes[i], entry[i]);
 444                  if (empty || tie->pos < ie->pos) {
 445                      ie = tie;
 446                      stream_id = i;
 447                  }
 448                  empty = 0;
 449             }
 450             if (!empty) {
 451                 avi_stream2fourcc(&tag[0], stream_id,
 452                                   s->streams[stream_id]->codec->codec_type);
 453                 put_tag(pb, &tag[0]);
 454                 put_le32(pb, ie->flags);
 455                 put_le32(pb, ie->pos);
 456                 put_le32(pb, ie->len);
 457                 entry[stream_id]++;
 458             }
 459         } while (!empty);
 460         end_tag(pb, idx_chunk);
 461
 462         avi_write_counters(s, avi->riff_id);
 463     }
 464     return 0;
 465 }
 466
 467 static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
 468 {
 469     AVIContext *avi = s->priv_data;
 470     ByteIOContext *pb = s->pb;
 471     unsigned char tag[5];
 472     unsigned int flags=0;
 473     const int stream_index= pkt->stream_index;
 474     AVCodecContext *enc= s->streams[stream_index]->codec;
 475     int size= pkt->size;
 476
 477 //    av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %d\n", pkt->dts, avi->packet_count[stream_index], stream_index);
 478     while(enc->block_align==0 && pkt->dts != AV_NOPTS_VALUE && pkt->dts > avi->packet_count[stream_index]){
 479         AVPacket empty_packet;
 480
 481         av_init_packet(&empty_packet);
 482         empty_packet.size= 0;
 483         empty_packet.data= NULL;
 484         empty_packet.stream_index= stream_index;
 485         avi_write_packet(s, &empty_packet);
 486 //        av_log(s, AV_LOG_DEBUG, "dup %"PRId64" %d\n", pkt->dts, avi->packet_count[stream_index]);
 487     }
 488     avi->packet_count[stream_index]++;
 489
 490     // Make sure to put an OpenDML chunk when the file size exceeds the limits
 491     if (!url_is_streamed(pb) &&
 492         (url_ftell(pb) - avi->riff_start > AVI_MAX_RIFF_SIZE)) {
 493
 494         avi_write_ix(s);
 495         end_tag(pb, avi->movi_list);
 496
 497         if (avi->riff_id == 1)
 498             avi_write_idx1(s);
 499
 500         end_tag(pb, avi->riff_start);
 501         avi->movi_list = avi_start_new_riff(avi, pb, "AVIX", "movi");
 502     }
 503
 504     avi_stream2fourcc(&tag[0], stream_index, enc->codec_type);
 505     if(pkt->flags&PKT_FLAG_KEY)
 506         flags = 0x10;
 507     if (enc->codec_type == CODEC_TYPE_AUDIO) {
 508        avi->audio_strm_length[stream_index] += size;
 509     }
 510
 511     if (!url_is_streamed(s->pb)) {
 512         AVIIndex* idx = &avi->indexes[stream_index];
 513         int cl = idx->entry / AVI_INDEX_CLUSTER_SIZE;
 514         int id = idx->entry % AVI_INDEX_CLUSTER_SIZE;
 515         if (idx->ents_allocated <= idx->entry) {
 516             idx->cluster = av_realloc(idx->cluster, (cl+1)*sizeof(void*));
 517             if (!idx->cluster)
 518                 return -1;
 519             idx->cluster[cl] = av_malloc(AVI_INDEX_CLUSTER_SIZE*sizeof(AVIIentry));
 520             if (!idx->cluster[cl])
 521                 return -1;
 522             idx->ents_allocated += AVI_INDEX_CLUSTER_SIZE;
 523         }
 524
 525         idx->cluster[cl][id].flags = flags;
 526         idx->cluster[cl][id].pos = url_ftell(pb) - avi->movi_list;
 527         idx->cluster[cl][id].len = size;
 528         idx->entry++;
 529     }
 530
 531     put_buffer(pb, tag, 4);
 532     put_le32(pb, size);
 533     put_buffer(pb, pkt->data, size);
 534     if (size & 1)
 535         put_byte(pb, 0);
 536
 537     put_flush_packet(pb);
 538     return 0;
 539 }
 540
 541 static int avi_write_trailer(AVFormatContext *s)
 542 {
 543     AVIContext *avi = s->priv_data;
 544     ByteIOContext *pb = s->pb;
 545     int res = 0;
 546     int i, j, n, nb_frames;
 547     offset_t file_size;
 548
 549     if (!url_is_streamed(pb)){
 550         if (avi->riff_id == 1) {
 551             end_tag(pb, avi->movi_list);
 552             res = avi_write_idx1(s);
 553             end_tag(pb, avi->riff_start);
 554         } else {
 555             avi_write_ix(s);
 556             end_tag(pb, avi->movi_list);
 557             end_tag(pb, avi->riff_start);
 558
 559             file_size = url_ftell(pb);
 560             url_fseek(pb, avi->odml_list - 8, SEEK_SET);
 561             put_tag(pb, "LIST"); /* Making this AVI OpenDML one */
 562             url_fskip(pb, 16);
 563
 564             for (n=nb_frames=0;n<s->nb_streams;n++) {
 565                 AVCodecContext *stream = s->streams[n]->codec;
 566                 if (stream->codec_type == CODEC_TYPE_VIDEO) {
 567                     if (nb_frames < avi->packet_count[n])
 568                         nb_frames = avi->packet_count[n];
 569                 } else {
 570                     if (stream->codec_id == CODEC_ID_MP2 || stream->codec_id == CODEC_ID_MP3) {
 571                         nb_frames += avi->packet_count[n];
 572                     }
 573                 }
 574             }
 575             put_le32(pb, nb_frames);
 576             url_fseek(pb, file_size, SEEK_SET);
 577
 578             avi_write_counters(s, avi->riff_id);
 579         }
 580     }
 581     put_flush_packet(pb);
 582
 583     for (i=0; i<MAX_STREAMS; i++) {
 584          for (j=0; j<avi->indexes[i].ents_allocated/AVI_INDEX_CLUSTER_SIZE; j++)
 585               av_free(avi->indexes[i].cluster[j]);
 586          av_free(avi->indexes[i].cluster);
 587          avi->indexes[i].cluster = NULL;
 588          avi->indexes[i].ents_allocated = avi->indexes[i].entry = 0;
 589     }
 590
 591     return res;
 592 }
 593
 594 AVOutputFormat avi_muxer = {
 595     "avi",
 596     NULL_IF_CONFIG_SMALL("AVI format"),
 597     "video/x-msvideo",
 598     "avi",
 599     sizeof(AVIContext),
 600     CODEC_ID_MP2,
 601     CODEC_ID_MPEG4,
 602     avi_write_header,
 603     avi_write_packet,
 604     avi_write_trailer,
 605     .codec_tag= (const AVCodecTag*[]){codec_bmp_tags, codec_wav_tags, 0},
 606 };
 607 #endif //CONFIG_AVI_MUXER