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 if (type == CODEC_TYPE_SUBTITLE) {
  85         // note: this is not an official code
  86         tag[2] = 's';
  87         tag[3] = 'b';
  88     } else {
  89         tag[2] = 'w';
  90         tag[3] = 'b';
  91     }
  92     tag[4] = '\0';
  93     return tag;
  94 }
  95
  96 static void avi_write_info_tag(ByteIOContext *pb, const char *tag, const char *str)
  97 {
  98     int len = strlen(str);
  99     if (len > 0) {
 100         len++;
 101         put_tag(pb, tag);
 102         put_le32(pb, len);
 103         put_strz(pb, str);
 104         if (len & 1)
 105             put_byte(pb, 0);
 106     }
 107 }
 108
 109 static void avi_write_info_tag2(AVFormatContext *s, const char *fourcc, const char *key1, const char *key2)
 110 {
 111     AVMetadataTag *tag= av_metadata_get(s->metadata, key1, NULL, 0);
 112     if(!tag && key2)
 113         tag= av_metadata_get(s->metadata, key2, NULL, 0);
 114     if(tag)
 115         avi_write_info_tag(s->pb, fourcc, tag->value);
 116 }
 117
 118 static int avi_write_counters(AVFormatContext* s, int riff_id)
 119 {
 120     ByteIOContext *pb = s->pb;
 121     AVIContext *avi = s->priv_data;
 122     int n, au_byterate, au_ssize, au_scale, nb_frames = 0;
 123     int64_t file_size;
 124     AVCodecContext* stream;
 125
 126     file_size = url_ftell(pb);
 127     for(n = 0; n < s->nb_streams; n++) {
 128         assert(avi->frames_hdr_strm[n]);
 129         stream = s->streams[n]->codec;
 130         url_fseek(pb, avi->frames_hdr_strm[n], SEEK_SET);
 131         ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
 132         if(au_ssize == 0) {
 133             put_le32(pb, avi->packet_count[n]);
 134         } else {
 135             put_le32(pb, avi->audio_strm_length[n] / au_ssize);
 136         }
 137         if(stream->codec_type == CODEC_TYPE_VIDEO)
 138             nb_frames = FFMAX(nb_frames, avi->packet_count[n]);
 139     }
 140     if(riff_id == 1) {
 141         assert(avi->frames_hdr_all);
 142         url_fseek(pb, avi->frames_hdr_all, SEEK_SET);
 143         put_le32(pb, nb_frames);
 144     }
 145     url_fseek(pb, file_size, SEEK_SET);
 146
 147     return 0;
 148 }
 149
 150 static int avi_write_header(AVFormatContext *s)
 151 {
 152     AVIContext *avi = s->priv_data;
 153     ByteIOContext *pb = s->pb;
 154     int bitrate, n, i, nb_frames, au_byterate, au_ssize, au_scale;
 155     AVCodecContext *stream, *video_enc;
 156     int64_t list1, list2, strh, strf;
 157
 158     /* header list */
 159     avi->riff_id = 0;
 160     list1 = avi_start_new_riff(avi, pb, "AVI ", "hdrl");
 161
 162     /* avi header */
 163     put_tag(pb, "avih");
 164     put_le32(pb, 14 * 4);
 165     bitrate = 0;
 166
 167     video_enc = NULL;
 168     for(n=0;n<s->nb_streams;n++) {
 169         stream = s->streams[n]->codec;
 170         bitrate += stream->bit_rate;
 171         if (stream->codec_type == CODEC_TYPE_VIDEO)
 172             video_enc = stream;
 173     }
 174
 175     nb_frames = 0;
 176
 177     if(video_enc){
 178         put_le32(pb, (uint32_t)(INT64_C(1000000) * video_enc->time_base.num / video_enc->time_base.den));
 179     } else {
 180         put_le32(pb, 0);
 181     }
 182     put_le32(pb, bitrate / 8); /* XXX: not quite exact */
 183     put_le32(pb, 0); /* padding */
 184     if (url_is_streamed(pb))
 185         put_le32(pb, AVIF_TRUSTCKTYPE | AVIF_ISINTERLEAVED); /* flags */
 186     else
 187         put_le32(pb, AVIF_TRUSTCKTYPE | AVIF_HASINDEX | AVIF_ISINTERLEAVED); /* flags */
 188     avi->frames_hdr_all = url_ftell(pb); /* remember this offset to fill later */
 189     put_le32(pb, nb_frames); /* nb frames, filled later */
 190     put_le32(pb, 0); /* initial frame */
 191     put_le32(pb, s->nb_streams); /* nb streams */
 192     put_le32(pb, 1024 * 1024); /* suggested buffer size */
 193     if(video_enc){
 194         put_le32(pb, video_enc->width);
 195         put_le32(pb, video_enc->height);
 196     } else {
 197         put_le32(pb, 0);
 198         put_le32(pb, 0);
 199     }
 200     put_le32(pb, 0); /* reserved */
 201     put_le32(pb, 0); /* reserved */
 202     put_le32(pb, 0); /* reserved */
 203     put_le32(pb, 0); /* reserved */
 204
 205     /* stream list */
 206     for(i=0;i<n;i++) {
 207         list2 = start_tag(pb, "LIST");
 208         put_tag(pb, "strl");
 209
 210         stream = s->streams[i]->codec;
 211
 212         /* stream generic header */
 213         strh = start_tag(pb, "strh");
 214         switch(stream->codec_type) {
 215         case CODEC_TYPE_SUBTITLE:
 216             // XSUB subtitles behave like video tracks, other subtitles
 217             // are not (yet) supported.
 218             if (stream->codec_id != CODEC_ID_XSUB) break;
 219         case CODEC_TYPE_VIDEO: put_tag(pb, "vids"); break;
 220         case CODEC_TYPE_AUDIO: put_tag(pb, "auds"); break;
 221 //        case CODEC_TYPE_TEXT : put_tag(pb, "txts"); break;
 222         case CODEC_TYPE_DATA : put_tag(pb, "dats"); break;
 223         }
 224         if(stream->codec_type == CODEC_TYPE_VIDEO ||
 225            stream->codec_id == CODEC_ID_XSUB)
 226             put_le32(pb, stream->codec_tag);
 227         else
 228             put_le32(pb, 1);
 229         put_le32(pb, 0); /* flags */
 230         put_le16(pb, 0); /* priority */
 231         put_le16(pb, 0); /* language */
 232         put_le32(pb, 0); /* initial frame */
 233
 234         ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
 235
 236         put_le32(pb, au_scale); /* scale */
 237         put_le32(pb, au_byterate); /* rate */
 238         av_set_pts_info(s->streams[i], 64, au_scale, au_byterate);
 239
 240         put_le32(pb, 0); /* start */
 241         avi->frames_hdr_strm[i] = url_ftell(pb); /* remember this offset to fill later */
 242         if (url_is_streamed(pb))
 243             put_le32(pb, AVI_MAX_RIFF_SIZE); /* FIXME: this may be broken, but who cares */
 244         else
 245             put_le32(pb, 0); /* length, XXX: filled later */
 246
 247         /* suggested buffer size */ //FIXME set at the end to largest chunk
 248         if(stream->codec_type == CODEC_TYPE_VIDEO)
 249             put_le32(pb, 1024 * 1024);
 250         else if(stream->codec_type == CODEC_TYPE_AUDIO)
 251             put_le32(pb, 12 * 1024);
 252         else
 253             put_le32(pb, 0);
 254         put_le32(pb, -1); /* quality */
 255         put_le32(pb, au_ssize); /* sample size */
 256         put_le32(pb, 0);
 257         put_le16(pb, stream->width);
 258         put_le16(pb, stream->height);
 259         end_tag(pb, strh);
 260
 261       if(stream->codec_type != CODEC_TYPE_DATA){
 262         strf = start_tag(pb, "strf");
 263         switch(stream->codec_type) {
 264         case CODEC_TYPE_SUBTITLE:
 265             // XSUB subtitles behave like video tracks, other subtitles
 266             // are not (yet) supported.
 267             if (stream->codec_id != CODEC_ID_XSUB) break;
 268         case CODEC_TYPE_VIDEO:
 269             put_bmp_header(pb, stream, codec_bmp_tags, 0);
 270             break;
 271         case CODEC_TYPE_AUDIO:
 272             if (put_wav_header(pb, stream) < 0) {
 273                 return -1;
 274             }
 275             break;
 276         default:
 277             return -1;
 278         }
 279         end_tag(pb, strf);
 280       }
 281
 282         if (!url_is_streamed(pb)) {
 283             unsigned char tag[5];
 284             int j;
 285
 286             /* Starting to lay out AVI OpenDML master index.
 287              * We want to make it JUNK entry for now, since we'd
 288              * like to get away without making AVI an OpenDML one
 289              * for compatibility reasons.
 290              */
 291             avi->indexes[i].entry = avi->indexes[i].ents_allocated = 0;
 292             avi->indexes[i].indx_start = start_tag(pb, "JUNK");
 293             put_le16(pb, 4);        /* wLongsPerEntry */
 294             put_byte(pb, 0);        /* bIndexSubType (0 == frame index) */
 295             put_byte(pb, 0);        /* bIndexType (0 == AVI_INDEX_OF_INDEXES) */
 296             put_le32(pb, 0);        /* nEntriesInUse (will fill out later on) */
 297             put_tag(pb, avi_stream2fourcc(&tag[0], i, stream->codec_type));
 298                                     /* dwChunkId */
 299             put_le64(pb, 0);        /* dwReserved[3]
 300             put_le32(pb, 0);           Must be 0.    */
 301             for (j=0; j < AVI_MASTER_INDEX_SIZE * 2; j++)
 302                  put_le64(pb, 0);
 303             end_tag(pb, avi->indexes[i].indx_start);
 304         }
 305
 306         if(   stream->codec_type == CODEC_TYPE_VIDEO
 307            && s->streams[i]->sample_aspect_ratio.num>0
 308            && s->streams[i]->sample_aspect_ratio.den>0){
 309             int vprp= start_tag(pb, "vprp");
 310             AVRational dar = av_mul_q(s->streams[i]->sample_aspect_ratio,
 311                                       (AVRational){stream->width, stream->height});
 312             int num, den;
 313             av_reduce(&num, &den, dar.num, dar.den, 0xFFFF);
 314
 315             put_le32(pb, 0); //video format  = unknown
 316             put_le32(pb, 0); //video standard= unknown
 317             put_le32(pb, lrintf(1.0/av_q2d(stream->time_base)));
 318             put_le32(pb, stream->width );
 319             put_le32(pb, stream->height);
 320             put_le16(pb, den);
 321             put_le16(pb, num);
 322             put_le32(pb, stream->width );
 323             put_le32(pb, stream->height);
 324             put_le32(pb, 1); //progressive FIXME
 325
 326             put_le32(pb, stream->height);
 327             put_le32(pb, stream->width );
 328             put_le32(pb, stream->height);
 329             put_le32(pb, stream->width );
 330             put_le32(pb, 0);
 331             put_le32(pb, 0);
 332
 333             put_le32(pb, 0);
 334             put_le32(pb, 0);
 335             end_tag(pb, vprp);
 336         }
 337
 338         end_tag(pb, list2);
 339     }
 340
 341     if (!url_is_streamed(pb)) {
 342         /* AVI could become an OpenDML one, if it grows beyond 2Gb range */
 343         avi->odml_list = start_tag(pb, "JUNK");
 344         put_tag(pb, "odml");
 345         put_tag(pb, "dmlh");
 346         put_le32(pb, 248);
 347         for (i = 0; i < 248; i+= 4)
 348              put_le32(pb, 0);
 349         end_tag(pb, avi->odml_list);
 350     }
 351
 352     end_tag(pb, list1);
 353
 354     list2 = start_tag(pb, "LIST");
 355     put_tag(pb, "INFO");
 356     avi_write_info_tag2(s, "INAM", "Title", NULL);
 357     avi_write_info_tag2(s, "IART", "Artist", "Author");
 358     avi_write_info_tag2(s, "ICOP", "Copyright", NULL);
 359     avi_write_info_tag2(s, "ICMT", "Comment", NULL);
 360     avi_write_info_tag2(s, "IPRD", "Album", NULL);
 361     avi_write_info_tag2(s, "IGNR", "Genre", NULL);
 362     avi_write_info_tag2(s, "IPRT", "Track", NULL);
 363     if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
 364         avi_write_info_tag(pb, "ISFT", LIBAVFORMAT_IDENT);
 365     end_tag(pb, list2);
 366
 367     /* some padding for easier tag editing */
 368     list2 = start_tag(pb, "JUNK");
 369     for (i = 0; i < 1016; i += 4)
 370         put_le32(pb, 0);
 371     end_tag(pb, list2);
 372
 373     avi->movi_list = start_tag(pb, "LIST");
 374     put_tag(pb, "movi");
 375
 376     put_flush_packet(pb);
 377
 378     return 0;
 379 }
 380
 381 static int avi_write_ix(AVFormatContext *s)
 382 {
 383     ByteIOContext *pb = s->pb;
 384     AVIContext *avi = s->priv_data;
 385     char tag[5];
 386     char ix_tag[] = "ix00";
 387     int i, j;
 388
 389     assert(!url_is_streamed(pb));
 390
 391     if (avi->riff_id > AVI_MASTER_INDEX_SIZE)
 392         return -1;
 393
 394     for (i=0;i<s->nb_streams;i++) {
 395          int64_t ix, pos;
 396
 397          avi_stream2fourcc(&tag[0], i, s->streams[i]->codec->codec_type);
 398          ix_tag[3] = '0' + i;
 399
 400          /* Writing AVI OpenDML leaf index chunk */
 401          ix = url_ftell(pb);
 402          put_tag(pb, &ix_tag[0]);     /* ix?? */
 403          put_le32(pb, avi->indexes[i].entry * 8 + 24);
 404                                       /* chunk size */
 405          put_le16(pb, 2);             /* wLongsPerEntry */
 406          put_byte(pb, 0);             /* bIndexSubType (0 == frame index) */
 407          put_byte(pb, 1);             /* bIndexType (1 == AVI_INDEX_OF_CHUNKS) */
 408          put_le32(pb, avi->indexes[i].entry);
 409                                       /* nEntriesInUse */
 410          put_tag(pb, &tag[0]);        /* dwChunkId */
 411          put_le64(pb, avi->movi_list);/* qwBaseOffset */
 412          put_le32(pb, 0);             /* dwReserved_3 (must be 0) */
 413
 414          for (j=0; j<avi->indexes[i].entry; j++) {
 415              AVIIentry* ie = avi_get_ientry(&avi->indexes[i], j);
 416              put_le32(pb, ie->pos + 8);
 417              put_le32(pb, ((uint32_t)ie->len & ~0x80000000) |
 418                           (ie->flags & 0x10 ? 0 : 0x80000000));
 419          }
 420          put_flush_packet(pb);
 421          pos = url_ftell(pb);
 422
 423          /* Updating one entry in the AVI OpenDML master index */
 424          url_fseek(pb, avi->indexes[i].indx_start - 8, SEEK_SET);
 425          put_tag(pb, "indx");                 /* enabling this entry */
 426          url_fskip(pb, 8);
 427          put_le32(pb, avi->riff_id);          /* nEntriesInUse */
 428          url_fskip(pb, 16*avi->riff_id);
 429          put_le64(pb, ix);                    /* qwOffset */
 430          put_le32(pb, pos - ix);              /* dwSize */
 431          put_le32(pb, avi->indexes[i].entry); /* dwDuration */
 432
 433          url_fseek(pb, pos, SEEK_SET);
 434     }
 435     return 0;
 436 }
 437
 438 static int avi_write_idx1(AVFormatContext *s)
 439 {
 440     ByteIOContext *pb = s->pb;
 441     AVIContext *avi = s->priv_data;
 442     int64_t idx_chunk;
 443     int i;
 444     char tag[5];
 445
 446     if (!url_is_streamed(pb)) {
 447         AVIIentry* ie = 0, *tie;
 448         int entry[MAX_STREAMS];
 449         int empty, stream_id = -1;
 450
 451         idx_chunk = start_tag(pb, "idx1");
 452         memset(&entry[0], 0, sizeof(entry));
 453         do {
 454             empty = 1;
 455             for (i=0; i<s->nb_streams; i++) {
 456                  if (avi->indexes[i].entry <= entry[i])
 457                      continue;
 458
 459                  tie = avi_get_ientry(&avi->indexes[i], entry[i]);
 460                  if (empty || tie->pos < ie->pos) {
 461                      ie = tie;
 462                      stream_id = i;
 463                  }
 464                  empty = 0;
 465             }
 466             if (!empty) {
 467                 avi_stream2fourcc(&tag[0], stream_id,
 468                                   s->streams[stream_id]->codec->codec_type);
 469                 put_tag(pb, &tag[0]);
 470                 put_le32(pb, ie->flags);
 471                 put_le32(pb, ie->pos);
 472                 put_le32(pb, ie->len);
 473                 entry[stream_id]++;
 474             }
 475         } while (!empty);
 476         end_tag(pb, idx_chunk);
 477
 478         avi_write_counters(s, avi->riff_id);
 479     }
 480     return 0;
 481 }
 482
 483 static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
 484 {
 485     AVIContext *avi = s->priv_data;
 486     ByteIOContext *pb = s->pb;
 487     unsigned char tag[5];
 488     unsigned int flags=0;
 489     const int stream_index= pkt->stream_index;
 490     AVCodecContext *enc= s->streams[stream_index]->codec;
 491     int size= pkt->size;
 492
 493 //    av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %d\n", pkt->dts, avi->packet_count[stream_index], stream_index);
 494     while(enc->block_align==0 && pkt->dts != AV_NOPTS_VALUE && pkt->dts > avi->packet_count[stream_index]){
 495         AVPacket empty_packet;
 496
 497         av_init_packet(&empty_packet);
 498         empty_packet.size= 0;
 499         empty_packet.data= NULL;
 500         empty_packet.stream_index= stream_index;
 501         avi_write_packet(s, &empty_packet);
 502 //        av_log(s, AV_LOG_DEBUG, "dup %"PRId64" %d\n", pkt->dts, avi->packet_count[stream_index]);
 503     }
 504     avi->packet_count[stream_index]++;
 505
 506     // Make sure to put an OpenDML chunk when the file size exceeds the limits
 507     if (!url_is_streamed(pb) &&
 508         (url_ftell(pb) - avi->riff_start > AVI_MAX_RIFF_SIZE)) {
 509
 510         avi_write_ix(s);
 511         end_tag(pb, avi->movi_list);
 512
 513         if (avi->riff_id == 1)
 514             avi_write_idx1(s);
 515
 516         end_tag(pb, avi->riff_start);
 517         avi->movi_list = avi_start_new_riff(avi, pb, "AVIX", "movi");
 518     }
 519
 520     avi_stream2fourcc(&tag[0], stream_index, enc->codec_type);
 521     if(pkt->flags&PKT_FLAG_KEY)
 522         flags = 0x10;
 523     if (enc->codec_type == CODEC_TYPE_AUDIO) {
 524        avi->audio_strm_length[stream_index] += size;
 525     }
 526
 527     if (!url_is_streamed(s->pb)) {
 528         AVIIndex* idx = &avi->indexes[stream_index];
 529         int cl = idx->entry / AVI_INDEX_CLUSTER_SIZE;
 530         int id = idx->entry % AVI_INDEX_CLUSTER_SIZE;
 531         if (idx->ents_allocated <= idx->entry) {
 532             idx->cluster = av_realloc(idx->cluster, (cl+1)*sizeof(void*));
 533             if (!idx->cluster)
 534                 return -1;
 535             idx->cluster[cl] = av_malloc(AVI_INDEX_CLUSTER_SIZE*sizeof(AVIIentry));
 536             if (!idx->cluster[cl])
 537                 return -1;
 538             idx->ents_allocated += AVI_INDEX_CLUSTER_SIZE;
 539         }
 540
 541         idx->cluster[cl][id].flags = flags;
 542         idx->cluster[cl][id].pos = url_ftell(pb) - avi->movi_list;
 543         idx->cluster[cl][id].len = size;
 544         idx->entry++;
 545     }
 546
 547     put_buffer(pb, tag, 4);
 548     put_le32(pb, size);
 549     put_buffer(pb, pkt->data, size);
 550     if (size & 1)
 551         put_byte(pb, 0);
 552
 553     put_flush_packet(pb);
 554     return 0;
 555 }
 556
 557 static int avi_write_trailer(AVFormatContext *s)
 558 {
 559     AVIContext *avi = s->priv_data;
 560     ByteIOContext *pb = s->pb;
 561     int res = 0;
 562     int i, j, n, nb_frames;
 563     int64_t file_size;
 564
 565     if (!url_is_streamed(pb)){
 566         if (avi->riff_id == 1) {
 567             end_tag(pb, avi->movi_list);
 568             res = avi_write_idx1(s);
 569             end_tag(pb, avi->riff_start);
 570         } else {
 571             avi_write_ix(s);
 572             end_tag(pb, avi->movi_list);
 573             end_tag(pb, avi->riff_start);
 574
 575             file_size = url_ftell(pb);
 576             url_fseek(pb, avi->odml_list - 8, SEEK_SET);
 577             put_tag(pb, "LIST"); /* Making this AVI OpenDML one */
 578             url_fskip(pb, 16);
 579
 580             for (n=nb_frames=0;n<s->nb_streams;n++) {
 581                 AVCodecContext *stream = s->streams[n]->codec;
 582                 if (stream->codec_type == CODEC_TYPE_VIDEO) {
 583                     if (nb_frames < avi->packet_count[n])
 584                         nb_frames = avi->packet_count[n];
 585                 } else {
 586                     if (stream->codec_id == CODEC_ID_MP2 || stream->codec_id == CODEC_ID_MP3) {
 587                         nb_frames += avi->packet_count[n];
 588                     }
 589                 }
 590             }
 591             put_le32(pb, nb_frames);
 592             url_fseek(pb, file_size, SEEK_SET);
 593
 594             avi_write_counters(s, avi->riff_id);
 595         }
 596     }
 597     put_flush_packet(pb);
 598
 599     for (i=0; i<MAX_STREAMS; i++) {
 600          for (j=0; j<avi->indexes[i].ents_allocated/AVI_INDEX_CLUSTER_SIZE; j++)
 601               av_free(avi->indexes[i].cluster[j]);
 602          av_freep(&avi->indexes[i].cluster);
 603          avi->indexes[i].ents_allocated = avi->indexes[i].entry = 0;
 604     }
 605
 606     return res;
 607 }
 608
 609 AVOutputFormat avi_muxer = {
 610     "avi",
 611     NULL_IF_CONFIG_SMALL("AVI format"),
 612     "video/x-msvideo",
 613     "avi",
 614     sizeof(AVIContext),
 615     CODEC_ID_MP2,
 616     CODEC_ID_MPEG4,
 617     avi_write_header,
 618     avi_write_packet,
 619     avi_write_trailer,
 620     .codec_tag= (const AVCodecTag* const []){codec_bmp_tags, codec_wav_tags, 0},
 621     .flags= AVFMT_VARIABLE_FPS,
 622 };