/*

  * 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

  */

 
 //#define DEBUG
 

 #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"

 #include "libavutil/timestamp.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 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 AVERROR(EINVAL);

     }
 

     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);
 

         if (   stream->codec_type == AVMEDIA_TYPE_VIDEO
             && stream->codec_id != AV_CODEC_ID_XSUB
             && au_byterate > 1000LL*au_scale) {
             au_byterate = 600;
             au_scale    = 1;
         }

         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){

           int ret;
 

         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 ((ret = ff_put_wav_header(pb, stream)) < 0) {
                 return ret;

             }

             break;

         default:

             av_log(s, AV_LOG_ERROR,
                    "Invalid or not supported codec type '%s' found in the input\n",
                    (char *)av_x_if_null(av_get_media_type_string(stream->codec_type), "?"));
             return AVERROR(EINVAL);

         }

         ff_end_tag(pb, strf);

         if ((t = av_dict_get(s->streams[i]->metadata, "title", NULL, 0))) {

             ff_riff_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);

     ff_riff_write_info(s);

 
     /* 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) {
         av_log(s, AV_LOG_ERROR, "Invalid riff index %d > %d\n",
                avi->riff_id, AVI_MASTER_INDEX_SIZE);
         return AVERROR(EINVAL);
     }

     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_dlog(s, "dts:%s packet_count:%d stream_index:%d\n", av_ts2str(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 && avist->packet_count){

         AVPacket empty_packet;
 

         if(pkt->dts - avist->packet_count > 60000){

             av_log(s, AV_LOG_ERROR, "Too large number of skipped frames %"PRId64" > 60000\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_dlog(s, "dup dts:%s packet_count:%d\n", av_ts2str(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 AVERROR(ENOMEM);

             idx->cluster[cl] = av_malloc(AVI_INDEX_CLUSTER_SIZE*sizeof(AVIIentry));

             if (!idx->cluster[cl])

                 return AVERROR(ENOMEM);

             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,

 };