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