Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

file 665 lines (580 sloc) 22.106 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665
/*
* AVI muxer
* Copyright (c) 2000 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "internal.h"
#include "avi.h"
#include "avio_internal.h"
#include "riff.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "libavutil/avassert.h"

/*
* TODO:
* - fill all fields if non streamed (nb_frames for example)
*/

typedef struct AVIIentry {
    unsigned int flags, pos, len;
} AVIIentry;

#define AVI_INDEX_CLUSTER_SIZE 16384

typedef struct AVIIndex {
    int64_t indx_start;
    int entry;
    int ents_allocated;
    AVIIentry** cluster;
} AVIIndex;

typedef struct {
    int64_t riff_start, movi_list, odml_list;
    int64_t frames_hdr_all;
    int riff_id;
} AVIContext;

typedef struct {
    int64_t frames_hdr_strm;
    int audio_strm_length;
    int packet_count;
    int entry;

    AVIIndex indexes;
} AVIStream ;

static inline AVIIentry* avi_get_ientry(AVIIndex* idx, int ent_id)
{
    int cl = ent_id / AVI_INDEX_CLUSTER_SIZE;
    int id = ent_id % AVI_INDEX_CLUSTER_SIZE;
    return &idx->cluster[cl][id];
}

static int64_t avi_start_new_riff(AVFormatContext *s, AVIOContext *pb,
                                  const char* riff_tag, const char* list_tag)
{
    AVIContext *avi= s->priv_data;
    int64_t loff;
    int i;

    avi->riff_id++;
    for (i=0; i<s->nb_streams; i++){
        AVIStream *avist= s->streams[i]->priv_data;
        avist->indexes.entry = 0;
    }

    avi->riff_start = ff_start_tag(pb, "RIFF");
    ffio_wfourcc(pb, riff_tag);
    loff = ff_start_tag(pb, "LIST");
    ffio_wfourcc(pb, list_tag);
    return loff;
}

static char* avi_stream2fourcc(char* tag, int index, enum AVMediaType type)
{
    tag[0] = '0' + index/10;
    tag[1] = '0' + index%10;
    if (type == AVMEDIA_TYPE_VIDEO) {
        tag[2] = 'd';
        tag[3] = 'c';
    } else if (type == AVMEDIA_TYPE_SUBTITLE) {
        // note: this is not an official code
        tag[2] = 's';
        tag[3] = 'b';
    } else {
        tag[2] = 'w';
        tag[3] = 'b';
    }
    tag[4] = '\0';
    return tag;
}

static void avi_write_info_tag(AVIOContext *pb, const char *tag, const char *str)
{
    int len = strlen(str);
    if (len > 0) {
        len++;
        ffio_wfourcc(pb, tag);
        avio_wl32(pb, len);
        avio_put_str(pb, str);
        if (len & 1)
            avio_w8(pb, 0);
    }
}

static int avi_write_counters(AVFormatContext* s, int riff_id)
{
    AVIOContext *pb = s->pb;
    AVIContext *avi = s->priv_data;
    int n, au_byterate, au_ssize, au_scale, nb_frames = 0;
    int64_t file_size;
    AVCodecContext* stream;

    file_size = avio_tell(pb);
    for(n = 0; n < s->nb_streams; n++) {
        AVIStream *avist= s->streams[n]->priv_data;

        av_assert0(avist->frames_hdr_strm);
        stream = s->streams[n]->codec;
        avio_seek(pb, avist->frames_hdr_strm, SEEK_SET);
        ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
        if(au_ssize == 0) {
            avio_wl32(pb, avist->packet_count);
        } else {
            avio_wl32(pb, avist->audio_strm_length / au_ssize);
        }
        if(stream->codec_type == AVMEDIA_TYPE_VIDEO)
            nb_frames = FFMAX(nb_frames, avist->packet_count);
    }
    if(riff_id == 1) {
        av_assert0(avi->frames_hdr_all);
        avio_seek(pb, avi->frames_hdr_all, SEEK_SET);
        avio_wl32(pb, nb_frames);
    }
    avio_seek(pb, file_size, SEEK_SET);

    return 0;
}

static int avi_write_header(AVFormatContext *s)
{
    AVIContext *avi = s->priv_data;
    AVIOContext *pb = s->pb;
    int bitrate, n, i, nb_frames, au_byterate, au_ssize, au_scale;
    AVCodecContext *stream, *video_enc;
    int64_t list1, list2, strh, strf;
    AVDictionaryEntry *t = NULL;

    if (s->nb_streams > AVI_MAX_STREAM_COUNT) {
        av_log(s, AV_LOG_ERROR, "AVI does not support >%d streams\n",
               AVI_MAX_STREAM_COUNT);
        return -1;
    }

    for(n=0;n<s->nb_streams;n++) {
        s->streams[n]->priv_data= av_mallocz(sizeof(AVIStream));
        if(!s->streams[n]->priv_data)
            return AVERROR(ENOMEM);
    }

    /* header list */
    avi->riff_id = 0;
    list1 = avi_start_new_riff(s, pb, "AVI ", "hdrl");

    /* avi header */
    ffio_wfourcc(pb, "avih");
    avio_wl32(pb, 14 * 4);
    bitrate = 0;

    video_enc = NULL;
    for(n=0;n<s->nb_streams;n++) {
        stream = s->streams[n]->codec;
        bitrate += stream->bit_rate;
        if (stream->codec_type == AVMEDIA_TYPE_VIDEO)
            video_enc = stream;
    }

    nb_frames = 0;

    if(video_enc){
        avio_wl32(pb, (uint32_t)(INT64_C(1000000) * video_enc->time_base.num / video_enc->time_base.den));
    } else {
        avio_wl32(pb, 0);
    }
    avio_wl32(pb, bitrate / 8); /* XXX: not quite exact */
    avio_wl32(pb, 0); /* padding */
    if (!pb->seekable)
        avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_ISINTERLEAVED); /* flags */
    else
        avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_HASINDEX | AVIF_ISINTERLEAVED); /* flags */
    avi->frames_hdr_all = avio_tell(pb); /* remember this offset to fill later */
    avio_wl32(pb, nb_frames); /* nb frames, filled later */
    avio_wl32(pb, 0); /* initial frame */
    avio_wl32(pb, s->nb_streams); /* nb streams */
    avio_wl32(pb, 1024 * 1024); /* suggested buffer size */
    if(video_enc){
        avio_wl32(pb, video_enc->width);
        avio_wl32(pb, video_enc->height);
    } else {
        avio_wl32(pb, 0);
        avio_wl32(pb, 0);
    }
    avio_wl32(pb, 0); /* reserved */
    avio_wl32(pb, 0); /* reserved */
    avio_wl32(pb, 0); /* reserved */
    avio_wl32(pb, 0); /* reserved */

    /* stream list */
    for(i=0;i<n;i++) {
        AVIStream *avist= s->streams[i]->priv_data;
        list2 = ff_start_tag(pb, "LIST");
        ffio_wfourcc(pb, "strl");

        stream = s->streams[i]->codec;

        /* stream generic header */
        strh = ff_start_tag(pb, "strh");
        switch(stream->codec_type) {
        case AVMEDIA_TYPE_SUBTITLE:
            // XSUB subtitles behave like video tracks, other subtitles
            // are not (yet) supported.
            if (stream->codec_id != AV_CODEC_ID_XSUB) {
                av_log(s, AV_LOG_ERROR, "Subtitle streams other than DivX XSUB are not supported by the AVI muxer.\n");
                return AVERROR_PATCHWELCOME;
            }
        case AVMEDIA_TYPE_VIDEO: ffio_wfourcc(pb, "vids"); break;
        case AVMEDIA_TYPE_AUDIO: ffio_wfourcc(pb, "auds"); break;
// case AVMEDIA_TYPE_TEXT : ffio_wfourcc(pb, "txts"); break;
        case AVMEDIA_TYPE_DATA : ffio_wfourcc(pb, "dats"); break;
        }
        if(stream->codec_type == AVMEDIA_TYPE_VIDEO ||
           stream->codec_id == AV_CODEC_ID_XSUB)
            avio_wl32(pb, stream->codec_tag);
        else
            avio_wl32(pb, 1);
        avio_wl32(pb, 0); /* flags */
        avio_wl16(pb, 0); /* priority */
        avio_wl16(pb, 0); /* language */
        avio_wl32(pb, 0); /* initial frame */

        ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);

        avpriv_set_pts_info(s->streams[i], 64, au_scale, au_byterate);
        if(stream->codec_id == AV_CODEC_ID_XSUB)
            au_scale = au_byterate = 0;

        avio_wl32(pb, au_scale); /* scale */
        avio_wl32(pb, au_byterate); /* rate */

        avio_wl32(pb, 0); /* start */
        avist->frames_hdr_strm = avio_tell(pb); /* remember this offset to fill later */
        if (!pb->seekable)
            avio_wl32(pb, AVI_MAX_RIFF_SIZE); /* FIXME: this may be broken, but who cares */
        else
            avio_wl32(pb, 0); /* length, XXX: filled later */

        /* suggested buffer size */ //FIXME set at the end to largest chunk
        if(stream->codec_type == AVMEDIA_TYPE_VIDEO)
            avio_wl32(pb, 1024 * 1024);
        else if(stream->codec_type == AVMEDIA_TYPE_AUDIO)
            avio_wl32(pb, 12 * 1024);
        else
            avio_wl32(pb, 0);
        avio_wl32(pb, -1); /* quality */
        avio_wl32(pb, au_ssize); /* sample size */
        avio_wl32(pb, 0);
        avio_wl16(pb, stream->width);
        avio_wl16(pb, stream->height);
        ff_end_tag(pb, strh);

      if(stream->codec_type != AVMEDIA_TYPE_DATA){
        strf = ff_start_tag(pb, "strf");
        switch(stream->codec_type) {
        case AVMEDIA_TYPE_SUBTITLE:
            // XSUB subtitles behave like video tracks, other subtitles
            // are not (yet) supported.
            if (stream->codec_id != AV_CODEC_ID_XSUB) break;
        case AVMEDIA_TYPE_VIDEO:
            ff_put_bmp_header(pb, stream, ff_codec_bmp_tags, 0);
            break;
        case AVMEDIA_TYPE_AUDIO:
            if (ff_put_wav_header(pb, stream) < 0) {
                return -1;
            }
            break;
        default:
            return -1;
        }
        ff_end_tag(pb, strf);
        if ((t = av_dict_get(s->streams[i]->metadata, "title", NULL, 0))) {
            avi_write_info_tag(s->pb, "strn", t->value);
            t = NULL;
        }
      }

        if (pb->seekable) {
            unsigned char tag[5];
            int j;

            /* Starting to lay out AVI OpenDML master index.
* We want to make it JUNK entry for now, since we'd
* like to get away without making AVI an OpenDML one
* for compatibility reasons.
*/
            avist->indexes.entry = avist->indexes.ents_allocated = 0;
            avist->indexes.indx_start = ff_start_tag(pb, "JUNK");
            avio_wl16(pb, 4); /* wLongsPerEntry */
            avio_w8(pb, 0); /* bIndexSubType (0 == frame index) */
            avio_w8(pb, 0); /* bIndexType (0 == AVI_INDEX_OF_INDEXES) */
            avio_wl32(pb, 0); /* nEntriesInUse (will fill out later on) */
            ffio_wfourcc(pb, avi_stream2fourcc(tag, i, stream->codec_type));
                                    /* dwChunkId */
            avio_wl64(pb, 0); /* dwReserved[3]
avio_wl32(pb, 0); Must be 0. */
            for (j=0; j < AVI_MASTER_INDEX_SIZE * 2; j++)
                 avio_wl64(pb, 0);
            ff_end_tag(pb, avist->indexes.indx_start);
        }

        if( stream->codec_type == AVMEDIA_TYPE_VIDEO
           && s->streams[i]->sample_aspect_ratio.num>0
           && s->streams[i]->sample_aspect_ratio.den>0){
            int vprp= ff_start_tag(pb, "vprp");
            AVRational dar = av_mul_q(s->streams[i]->sample_aspect_ratio,
                                      (AVRational){stream->width, stream->height});
            int num, den;
            av_reduce(&num, &den, dar.num, dar.den, 0xFFFF);

            avio_wl32(pb, 0); //video format = unknown
            avio_wl32(pb, 0); //video standard= unknown
            avio_wl32(pb, lrintf(1.0/av_q2d(stream->time_base)));
            avio_wl32(pb, stream->width );
            avio_wl32(pb, stream->height);
            avio_wl16(pb, den);
            avio_wl16(pb, num);
            avio_wl32(pb, stream->width );
            avio_wl32(pb, stream->height);
            avio_wl32(pb, 1); //progressive FIXME

            avio_wl32(pb, stream->height);
            avio_wl32(pb, stream->width );
            avio_wl32(pb, stream->height);
            avio_wl32(pb, stream->width );
            avio_wl32(pb, 0);
            avio_wl32(pb, 0);

            avio_wl32(pb, 0);
            avio_wl32(pb, 0);
            ff_end_tag(pb, vprp);
        }

        ff_end_tag(pb, list2);
    }

    if (pb->seekable) {
        /* AVI could become an OpenDML one, if it grows beyond 2Gb range */
        avi->odml_list = ff_start_tag(pb, "JUNK");
        ffio_wfourcc(pb, "odml");
        ffio_wfourcc(pb, "dmlh");
        avio_wl32(pb, 248);
        for (i = 0; i < 248; i+= 4)
             avio_wl32(pb, 0);
        ff_end_tag(pb, avi->odml_list);
    }

    ff_end_tag(pb, list1);

    list2 = ff_start_tag(pb, "LIST");
    ffio_wfourcc(pb, "INFO");
    ff_metadata_conv(&s->metadata, ff_riff_info_conv, NULL);
    for (i = 0; *ff_riff_tags[i]; i++) {
        if ((t = av_dict_get(s->metadata, ff_riff_tags[i], NULL, AV_DICT_MATCH_CASE)))
            avi_write_info_tag(s->pb, t->key, t->value);
    }
    ff_end_tag(pb, list2);

    /* some padding for easier tag editing */
    list2 = ff_start_tag(pb, "JUNK");
    for (i = 0; i < 1016; i += 4)
        avio_wl32(pb, 0);
    ff_end_tag(pb, list2);

    avi->movi_list = ff_start_tag(pb, "LIST");
    ffio_wfourcc(pb, "movi");

    avio_flush(pb);

    return 0;
}

static int avi_write_ix(AVFormatContext *s)
{
    AVIOContext *pb = s->pb;
    AVIContext *avi = s->priv_data;
    char tag[5];
    char ix_tag[] = "ix00";
    int i, j;

    av_assert0(pb->seekable);

    if (avi->riff_id > AVI_MASTER_INDEX_SIZE)
        return -1;

    for (i=0;i<s->nb_streams;i++) {
        AVIStream *avist= s->streams[i]->priv_data;
         int64_t ix, pos;

         avi_stream2fourcc(tag, i, s->streams[i]->codec->codec_type);
         ix_tag[3] = '0' + i;

         /* Writing AVI OpenDML leaf index chunk */
         ix = avio_tell(pb);
         ffio_wfourcc(pb, ix_tag); /* ix?? */
         avio_wl32(pb, avist->indexes.entry * 8 + 24);
                                      /* chunk size */
         avio_wl16(pb, 2); /* wLongsPerEntry */
         avio_w8(pb, 0); /* bIndexSubType (0 == frame index) */
         avio_w8(pb, 1); /* bIndexType (1 == AVI_INDEX_OF_CHUNKS) */
         avio_wl32(pb, avist->indexes.entry);
                                      /* nEntriesInUse */
         ffio_wfourcc(pb, tag); /* dwChunkId */
         avio_wl64(pb, avi->movi_list);/* qwBaseOffset */
         avio_wl32(pb, 0); /* dwReserved_3 (must be 0) */

         for (j=0; j<avist->indexes.entry; j++) {
             AVIIentry* ie = avi_get_ientry(&avist->indexes, j);
             avio_wl32(pb, ie->pos + 8);
             avio_wl32(pb, ((uint32_t)ie->len & ~0x80000000) |
                          (ie->flags & 0x10 ? 0 : 0x80000000));
         }
         avio_flush(pb);
         pos = avio_tell(pb);

         /* Updating one entry in the AVI OpenDML master index */
         avio_seek(pb, avist->indexes.indx_start - 8, SEEK_SET);
         ffio_wfourcc(pb, "indx"); /* enabling this entry */
         avio_skip(pb, 8);
         avio_wl32(pb, avi->riff_id); /* nEntriesInUse */
         avio_skip(pb, 16*avi->riff_id);
         avio_wl64(pb, ix); /* qwOffset */
         avio_wl32(pb, pos - ix); /* dwSize */
         avio_wl32(pb, avist->indexes.entry); /* dwDuration */

         avio_seek(pb, pos, SEEK_SET);
    }
    return 0;
}

static int avi_write_idx1(AVFormatContext *s)
{
    AVIOContext *pb = s->pb;
    AVIContext *avi = s->priv_data;
    int64_t idx_chunk;
    int i;
    char tag[5];

    if (pb->seekable) {
        AVIStream *avist;
        AVIIentry* ie = 0, *tie;
        int empty, stream_id = -1;

        idx_chunk = ff_start_tag(pb, "idx1");
        for(i=0; i<s->nb_streams; i++){
            avist= s->streams[i]->priv_data;
            avist->entry=0;
        }

        do {
            empty = 1;
            for (i=0; i<s->nb_streams; i++) {
                avist= s->streams[i]->priv_data;
                 if (avist->indexes.entry <= avist->entry)
                     continue;

                 tie = avi_get_ientry(&avist->indexes, avist->entry);
                 if (empty || tie->pos < ie->pos) {
                     ie = tie;
                     stream_id = i;
                 }
                 empty = 0;
            }
            if (!empty) {
                avist= s->streams[stream_id]->priv_data;
                avi_stream2fourcc(tag, stream_id,
                                  s->streams[stream_id]->codec->codec_type);
                ffio_wfourcc(pb, tag);
                avio_wl32(pb, ie->flags);
                avio_wl32(pb, ie->pos);
                avio_wl32(pb, ie->len);
                avist->entry++;
            }
        } while (!empty);
        ff_end_tag(pb, idx_chunk);

        avi_write_counters(s, avi->riff_id);
    }
    return 0;
}

static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    AVIContext *avi = s->priv_data;
    AVIOContext *pb = s->pb;
    unsigned char tag[5];
    unsigned int flags=0;
    const int stream_index= pkt->stream_index;
    AVIStream *avist= s->streams[stream_index]->priv_data;
    AVCodecContext *enc= s->streams[stream_index]->codec;
    int size= pkt->size;

// av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %d\n", pkt->dts, avist->packet_count, stream_index);
    while(enc->block_align==0 && pkt->dts != AV_NOPTS_VALUE && pkt->dts > avist->packet_count && enc->codec_id != AV_CODEC_ID_XSUB){
        AVPacket empty_packet;

        if(pkt->dts - avist->packet_count > 60000){
            av_log(s, AV_LOG_ERROR, "Too large number of skiped frames %"PRId64"\n", pkt->dts - avist->packet_count);
            return AVERROR(EINVAL);
        }

        av_init_packet(&empty_packet);
        empty_packet.size= 0;
        empty_packet.data= NULL;
        empty_packet.stream_index= stream_index;
        avi_write_packet(s, &empty_packet);
// av_log(s, AV_LOG_DEBUG, "dup %"PRId64" %d\n", pkt->dts, avist->packet_count);
    }
    avist->packet_count++;

    // Make sure to put an OpenDML chunk when the file size exceeds the limits
    if (pb->seekable &&
        (avio_tell(pb) - avi->riff_start > AVI_MAX_RIFF_SIZE)) {

        avi_write_ix(s);
        ff_end_tag(pb, avi->movi_list);

        if (avi->riff_id == 1)
            avi_write_idx1(s);

        ff_end_tag(pb, avi->riff_start);
        avi->movi_list = avi_start_new_riff(s, pb, "AVIX", "movi");
    }

    avi_stream2fourcc(tag, stream_index, enc->codec_type);
    if(pkt->flags&AV_PKT_FLAG_KEY)
        flags = 0x10;
    if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
       avist->audio_strm_length += size;
    }

    if (s->pb->seekable) {
        AVIIndex* idx = &avist->indexes;
        int cl = idx->entry / AVI_INDEX_CLUSTER_SIZE;
        int id = idx->entry % AVI_INDEX_CLUSTER_SIZE;
        if (idx->ents_allocated <= idx->entry) {
            idx->cluster = av_realloc_f(idx->cluster, sizeof(void*), cl+1);
            if (!idx->cluster)
                return -1;
            idx->cluster[cl] = av_malloc(AVI_INDEX_CLUSTER_SIZE*sizeof(AVIIentry));
            if (!idx->cluster[cl])
                return -1;
            idx->ents_allocated += AVI_INDEX_CLUSTER_SIZE;
        }

        idx->cluster[cl][id].flags = flags;
        idx->cluster[cl][id].pos = avio_tell(pb) - avi->movi_list;
        idx->cluster[cl][id].len = size;
        idx->entry++;
    }

    avio_write(pb, tag, 4);
    avio_wl32(pb, size);
    avio_write(pb, pkt->data, size);
    if (size & 1)
        avio_w8(pb, 0);

    avio_flush(pb);
    return 0;
}

static int avi_write_trailer(AVFormatContext *s)
{
    AVIContext *avi = s->priv_data;
    AVIOContext *pb = s->pb;
    int res = 0;
    int i, j, n, nb_frames;
    int64_t file_size;

    if (pb->seekable){
        if (avi->riff_id == 1) {
            ff_end_tag(pb, avi->movi_list);
            res = avi_write_idx1(s);
            ff_end_tag(pb, avi->riff_start);
        } else {
            avi_write_ix(s);
            ff_end_tag(pb, avi->movi_list);
            ff_end_tag(pb, avi->riff_start);

            file_size = avio_tell(pb);
            avio_seek(pb, avi->odml_list - 8, SEEK_SET);
            ffio_wfourcc(pb, "LIST"); /* Making this AVI OpenDML one */
            avio_skip(pb, 16);

            for (n=nb_frames=0;n<s->nb_streams;n++) {
                AVCodecContext *stream = s->streams[n]->codec;
                AVIStream *avist= s->streams[n]->priv_data;

                if (stream->codec_type == AVMEDIA_TYPE_VIDEO) {
                    if (nb_frames < avist->packet_count)
                        nb_frames = avist->packet_count;
                } else {
                    if (stream->codec_id == AV_CODEC_ID_MP2 || stream->codec_id == AV_CODEC_ID_MP3) {
                        nb_frames += avist->packet_count;
                    }
                }
            }
            avio_wl32(pb, nb_frames);
            avio_seek(pb, file_size, SEEK_SET);

            avi_write_counters(s, avi->riff_id);
        }
    }

    for (i=0; i<s->nb_streams; i++) {
         AVIStream *avist= s->streams[i]->priv_data;
         for (j=0; j<avist->indexes.ents_allocated/AVI_INDEX_CLUSTER_SIZE; j++)
              av_free(avist->indexes.cluster[j]);
         av_freep(&avist->indexes.cluster);
         avist->indexes.ents_allocated = avist->indexes.entry = 0;
    }

    return res;
}

AVOutputFormat ff_avi_muxer = {
    .name = "avi",
    .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
    .mime_type = "video/x-msvideo",
    .extensions = "avi",
    .priv_data_size = sizeof(AVIContext),
    .audio_codec = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_AC3,
    .video_codec = AV_CODEC_ID_MPEG4,
    .write_header = avi_write_header,
    .write_packet = avi_write_packet,
    .write_trailer = avi_write_trailer,
    .codec_tag = (const AVCodecTag* const []){
        ff_codec_bmp_tags, ff_codec_wav_tags, 0
    },
    .flags = AVFMT_VARIABLE_FPS,
};
Something went wrong with that request. Please try again.