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                 return -1;
 253             }
 254             break;
 255         default:
 256             return -1;
 257         }
 258         end_tag(pb, strf);
 259       }
 260
 261         if (!url_is_streamed(pb)) {
 262             unsigned char tag[5];
 263             int j;
 264
 265             /* Starting to lay out AVI OpenDML master index.
 266              * We want to make it JUNK entry for now, since we'd
 267              * like to get away without making AVI an OpenDML one
 268              * for compatibility reasons.
 269              */
 270             avi->indexes[i].entry = avi->indexes[i].ents_allocated = 0;
 271             avi->indexes[i].indx_start = start_tag(pb, "JUNK");
 272             put_le16(pb, 4);        /* wLongsPerEntry */
 273             put_byte(pb, 0);        /* bIndexSubType (0 == frame index) */
 274             put_byte(pb, 0);        /* bIndexType (0 == AVI_INDEX_OF_INDEXES) */
 275             put_le32(pb, 0);        /* nEntriesInUse (will fill out later on) */
 276             put_tag(pb, avi_stream2fourcc(&tag[0], i, stream->codec_type));
 277                                     /* dwChunkId */
 278             put_le64(pb, 0);        /* dwReserved[3]
 279             put_le32(pb, 0);           Must be 0.    */
 280             for (j=0; j < AVI_MASTER_INDEX_SIZE * 2; j++)
 281                  put_le64(pb, 0);
 282             end_tag(pb, avi->indexes[i].indx_start);
 283         }
 284
 285         if(   stream->codec_type == CODEC_TYPE_VIDEO
 286            && s->streams[i]->sample_aspect_ratio.num>0
 287            && s->streams[i]->sample_aspect_ratio.den>0){
 288             int vprp= start_tag(pb, "vprp");
 289             AVRational dar = av_mul_q(s->streams[i]->sample_aspect_ratio,
 290                                       (AVRational){stream->width, stream->height});
 291             int num, den;
 292             av_reduce(&num, &den, dar.num, dar.den, 0xFFFF);
 293
 294             put_le32(pb, 0); //video format  = unknown
 295             put_le32(pb, 0); //video standard= unknown
 296             put_le32(pb, lrintf(1.0/av_q2d(stream->time_base)));
 297             put_le32(pb, stream->width );
 298             put_le32(pb, stream->height);
 299             put_le16(pb, den);
 300             put_le16(pb, num);
 301             put_le32(pb, stream->width );
 302             put_le32(pb, stream->height);
 303             put_le32(pb, 1); //progressive FIXME
 304
 305             put_le32(pb, stream->height);
 306             put_le32(pb, stream->width );
 307             put_le32(pb, stream->height);
 308             put_le32(pb, stream->width );
 309             put_le32(pb, 0);
 310             put_le32(pb, 0);
 311
 312             put_le32(pb, 0);
 313             put_le32(pb, 0);
 314             end_tag(pb, vprp);
 315         }
 316
 317         end_tag(pb, list2);
 318     }
 319
 320     if (!url_is_streamed(pb)) {
 321         /* AVI could become an OpenDML one, if it grows beyond 2Gb range */
 322         avi->odml_list = start_tag(pb, "JUNK");
 323         put_tag(pb, "odml");
 324         put_tag(pb, "dmlh");
 325         put_le32(pb, 248);
 326         for (i = 0; i < 248; i+= 4)
 327              put_le32(pb, 0);
 328         end_tag(pb, avi->odml_list);
 329     }
 330
 331     end_tag(pb, list1);
 332
 333     list2 = start_tag(pb, "LIST");
 334     put_tag(pb, "INFO");
 335     avi_write_info_tag(pb, "INAM", s->title);
 336     avi_write_info_tag(pb, "IART", s->author);
 337     avi_write_info_tag(pb, "ICOP", s->copyright);
 338     avi_write_info_tag(pb, "ICMT", s->comment);
 339     avi_write_info_tag(pb, "IPRD", s->album);
 340     avi_write_info_tag(pb, "IGNR", s->genre);
 341     if (s->track) {
 342         char str_track[4];
 343         snprintf(str_track, 4, "%d", s->track);
 344         avi_write_info_tag(pb, "IPRT", str_track);
 345     }
 346     if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
 347         avi_write_info_tag(pb, "ISFT", LIBAVFORMAT_IDENT);
 348     end_tag(pb, list2);
 349
 350     /* some padding for easier tag editing */
 351     list2 = start_tag(pb, "JUNK");
 352     for (i = 0; i < 1016; i += 4)
 353         put_le32(pb, 0);
 354     end_tag(pb, list2);
 355
 356     avi->movi_list = start_tag(pb, "LIST");
 357     put_tag(pb, "movi");
 358
 359     put_flush_packet(pb);
 360
 361     return 0;
 362 }
 363
 364 static int avi_write_ix(AVFormatContext *s)
 365 {
 366     ByteIOContext *pb = s->pb;
 367     AVIContext *avi = s->priv_data;
 368     char tag[5];
 369     char ix_tag[] = "ix00";
 370     int i, j;
 371
 372     assert(!url_is_streamed(pb));
 373
 374     if (avi->riff_id > AVI_MASTER_INDEX_SIZE)
 375         return -1;
 376
 377     for (i=0;i<s->nb_streams;i++) {
 378          offset_t ix, pos;
 379
 380          avi_stream2fourcc(&tag[0], i, s->streams[i]->codec->codec_type);
 381          ix_tag[3] = '0' + i;
 382
 383          /* Writing AVI OpenDML leaf index chunk */
 384          ix = url_ftell(pb);
 385          put_tag(pb, &ix_tag[0]);     /* ix?? */
 386          put_le32(pb, avi->indexes[i].entry * 8 + 24);
 387                                       /* chunk size */
 388          put_le16(pb, 2);             /* wLongsPerEntry */
 389          put_byte(pb, 0);             /* bIndexSubType (0 == frame index) */
 390          put_byte(pb, 1);             /* bIndexType (1 == AVI_INDEX_OF_CHUNKS) */
 391          put_le32(pb, avi->indexes[i].entry);
 392                                       /* nEntriesInUse */
 393          put_tag(pb, &tag[0]);        /* dwChunkId */
 394          put_le64(pb, avi->movi_list);/* qwBaseOffset */
 395          put_le32(pb, 0);             /* dwReserved_3 (must be 0) */
 396
 397          for (j=0; j<avi->indexes[i].entry; j++) {
 398              AVIIentry* ie = avi_get_ientry(&avi->indexes[i], j);
 399              put_le32(pb, ie->pos + 8);
 400              put_le32(pb, ((uint32_t)ie->len & ~0x80000000) |
 401                           (ie->flags & 0x10 ? 0 : 0x80000000));
 402          }
 403          put_flush_packet(pb);
 404          pos = url_ftell(pb);
 405
 406          /* Updating one entry in the AVI OpenDML master index */
 407          url_fseek(pb, avi->indexes[i].indx_start - 8, SEEK_SET);
 408          put_tag(pb, "indx");                 /* enabling this entry */
 409          url_fskip(pb, 8);
 410          put_le32(pb, avi->riff_id);          /* nEntriesInUse */
 411          url_fskip(pb, 16*avi->riff_id);
 412          put_le64(pb, ix);                    /* qwOffset */
 413          put_le32(pb, pos - ix);              /* dwSize */
 414          put_le32(pb, avi->indexes[i].entry); /* dwDuration */
 415
 416          url_fseek(pb, pos, SEEK_SET);
 417     }
 418     return 0;
 419 }
 420
 421 static int avi_write_idx1(AVFormatContext *s)
 422 {
 423     ByteIOContext *pb = s->pb;
 424     AVIContext *avi = s->priv_data;
 425     offset_t idx_chunk;
 426     int i;
 427     char tag[5];
 428
 429     if (!url_is_streamed(pb)) {
 430         AVIIentry* ie = 0, *tie;
 431         int entry[MAX_STREAMS];
 432         int empty, stream_id = -1;
 433
 434         idx_chunk = start_tag(pb, "idx1");
 435         memset(&entry[0], 0, sizeof(entry));
 436         do {
 437             empty = 1;
 438             for (i=0; i<s->nb_streams; i++) {
 439                  if (avi->indexes[i].entry <= entry[i])
 440                      continue;
 441
 442                  tie = avi_get_ientry(&avi->indexes[i], entry[i]);
 443                  if (empty || tie->pos < ie->pos) {
 444                      ie = tie;
 445                      stream_id = i;
 446                  }
 447                  empty = 0;
 448             }
 449             if (!empty) {
 450                 avi_stream2fourcc(&tag[0], stream_id,
 451                                   s->streams[stream_id]->codec->codec_type);
 452                 put_tag(pb, &tag[0]);
 453                 put_le32(pb, ie->flags);
 454                 put_le32(pb, ie->pos);
 455                 put_le32(pb, ie->len);
 456                 entry[stream_id]++;
 457             }
 458         } while (!empty);
 459         end_tag(pb, idx_chunk);
 460
 461         avi_write_counters(s, avi->riff_id);
 462     }
 463     return 0;
 464 }
 465
 466 static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
 467 {
 468     AVIContext *avi = s->priv_data;
 469     ByteIOContext *pb = s->pb;
 470     unsigned char tag[5];
 471     unsigned int flags=0;
 472     const int stream_index= pkt->stream_index;
 473     AVCodecContext *enc= s->streams[stream_index]->codec;
 474     int size= pkt->size;
 475
 476 //    av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %d\n", pkt->dts, avi->packet_count[stream_index], stream_index);
 477     while(enc->block_align==0 && pkt->dts != AV_NOPTS_VALUE && pkt->dts > avi->packet_count[stream_index]){
 478         AVPacket empty_packet;
 479
 480         av_init_packet(&empty_packet);
 481         empty_packet.size= 0;
 482         empty_packet.data= NULL;
 483         empty_packet.stream_index= stream_index;
 484         avi_write_packet(s, &empty_packet);
 485 //        av_log(s, AV_LOG_DEBUG, "dup %"PRId64" %d\n", pkt->dts, avi->packet_count[stream_index]);
 486     }
 487     avi->packet_count[stream_index]++;
 488
 489     // Make sure to put an OpenDML chunk when the file size exceeds the limits
 490     if (!url_is_streamed(pb) &&
 491         (url_ftell(pb) - avi->riff_start > AVI_MAX_RIFF_SIZE)) {
 492
 493         avi_write_ix(s);
 494         end_tag(pb, avi->movi_list);
 495
 496         if (avi->riff_id == 1)
 497             avi_write_idx1(s);
 498
 499         end_tag(pb, avi->riff_start);
 500         avi->movi_list = avi_start_new_riff(avi, pb, "AVIX", "movi");
 501     }
 502
 503     avi_stream2fourcc(&tag[0], stream_index, enc->codec_type);
 504     if(pkt->flags&PKT_FLAG_KEY)
 505         flags = 0x10;
 506     if (enc->codec_type == CODEC_TYPE_AUDIO) {
 507        avi->audio_strm_length[stream_index] += size;
 508     }
 509
 510     if (!url_is_streamed(s->pb)) {
 511         AVIIndex* idx = &avi->indexes[stream_index];
 512         int cl = idx->entry / AVI_INDEX_CLUSTER_SIZE;
 513         int id = idx->entry % AVI_INDEX_CLUSTER_SIZE;
 514         if (idx->ents_allocated <= idx->entry) {
 515             idx->cluster = av_realloc(idx->cluster, (cl+1)*sizeof(void*));
 516             if (!idx->cluster)
 517                 return -1;
 518             idx->cluster[cl] = av_malloc(AVI_INDEX_CLUSTER_SIZE*sizeof(AVIIentry));
 519             if (!idx->cluster[cl])
 520                 return -1;
 521             idx->ents_allocated += AVI_INDEX_CLUSTER_SIZE;
 522         }
 523
 524         idx->cluster[cl][id].flags = flags;
 525         idx->cluster[cl][id].pos = url_ftell(pb) - avi->movi_list;
 526         idx->cluster[cl][id].len = size;
 527         idx->entry++;
 528     }
 529
 530     put_buffer(pb, tag, 4);
 531     put_le32(pb, size);
 532     put_buffer(pb, pkt->data, size);
 533     if (size & 1)
 534         put_byte(pb, 0);
 535
 536     put_flush_packet(pb);
 537     return 0;
 538 }
 539
 540 static int avi_write_trailer(AVFormatContext *s)
 541 {
 542     AVIContext *avi = s->priv_data;
 543     ByteIOContext *pb = s->pb;
 544     int res = 0;
 545     int i, j, n, nb_frames;
 546     offset_t file_size;
 547
 548     if (!url_is_streamed(pb)){
 549         if (avi->riff_id == 1) {
 550             end_tag(pb, avi->movi_list);
 551             res = avi_write_idx1(s);
 552             end_tag(pb, avi->riff_start);
 553         } else {
 554             avi_write_ix(s);
 555             end_tag(pb, avi->movi_list);
 556             end_tag(pb, avi->riff_start);
 557
 558             file_size = url_ftell(pb);
 559             url_fseek(pb, avi->odml_list - 8, SEEK_SET);
 560             put_tag(pb, "LIST"); /* Making this AVI OpenDML one */
 561             url_fskip(pb, 16);
 562
 563             for (n=nb_frames=0;n<s->nb_streams;n++) {
 564                 AVCodecContext *stream = s->streams[n]->codec;
 565                 if (stream->codec_type == CODEC_TYPE_VIDEO) {
 566                     if (nb_frames < avi->packet_count[n])
 567                         nb_frames = avi->packet_count[n];
 568                 } else {
 569                     if (stream->codec_id == CODEC_ID_MP2 || stream->codec_id == CODEC_ID_MP3) {
 570                         nb_frames += avi->packet_count[n];
 571                     }
 572                 }
 573             }
 574             put_le32(pb, nb_frames);
 575             url_fseek(pb, file_size, SEEK_SET);
 576
 577             avi_write_counters(s, avi->riff_id);
 578         }
 579     }
 580     put_flush_packet(pb);
 581
 582     for (i=0; i<MAX_STREAMS; i++) {
 583          for (j=0; j<avi->indexes[i].ents_allocated/AVI_INDEX_CLUSTER_SIZE; j++)
 584               av_free(avi->indexes[i].cluster[j]);
 585          av_free(avi->indexes[i].cluster);
 586          avi->indexes[i].cluster = NULL;
 587          avi->indexes[i].ents_allocated = avi->indexes[i].entry = 0;
 588     }
 589
 590     return res;
 591 }
 592
 593 AVOutputFormat avi_muxer = {
 594     "avi",
 595     NULL_IF_CONFIG_SMALL("AVI format"),
 596     "video/x-msvideo",
 597     "avi",
 598     sizeof(AVIContext),
 599     CODEC_ID_MP2,
 600     CODEC_ID_MPEG4,
 601     avi_write_header,
 602     avi_write_packet,
 603     avi_write_trailer,
 604     .codec_tag= (const AVCodecTag* const []){codec_bmp_tags, codec_wav_tags, 0},
 605 };
 606 #endif //CONFIG_AVI_MUXER