avienc.c 21.2 KB
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/*
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 * AVI muxer
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 * Copyright (c) 2000 Fabrice Bellard
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
#include "avformat.h"
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#include "internal.h"
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#include "avi.h"
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#include "avio_internal.h"
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#include "riff.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/dict.h"
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/*
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 * TODO:
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 *  - fill all fields if non streamed (nb_frames for example)
 */

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

#define AVI_INDEX_CLUSTER_SIZE 16384

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

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

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typedef struct  {
    int64_t frames_hdr_strm;
    int audio_strm_length;
    int packet_count;
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    int entry;
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    AVIIndex indexes;
} AVIStream ;

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

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static int64_t avi_start_new_riff(AVFormatContext *s, AVIOContext *pb,
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                                  const char* riff_tag, const char* list_tag)
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{
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    AVIContext *avi= s->priv_data;
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    int64_t loff;
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    int i;
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    avi->riff_id++;
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    for (i=0; i<s->nb_streams; i++){
        AVIStream *avist= s->streams[i]->priv_data;
        avist->indexes.entry = 0;
    }
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    avi->riff_start = ff_start_tag(pb, "RIFF");
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    ffio_wfourcc(pb, riff_tag);
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    loff = ff_start_tag(pb, "LIST");
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    ffio_wfourcc(pb, list_tag);
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    return loff;
}

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

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

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

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

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

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

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    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);
    }

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    /* header list */
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    avi->riff_id = 0;
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    list1 = avi_start_new_riff(s, pb, "AVI ", "hdrl");
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    /* avi header */
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    ffio_wfourcc(pb, "avih");
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    avio_wl32(pb, 14 * 4);
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    bitrate = 0;

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

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    if(video_enc){
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        avio_wl32(pb, (uint32_t)(INT64_C(1000000) * video_enc->time_base.num / video_enc->time_base.den));
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    } else {
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        avio_wl32(pb, 0);
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    }
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    avio_wl32(pb, bitrate / 8); /* XXX: not quite exact */
    avio_wl32(pb, 0); /* padding */
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    if (!pb->seekable)
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        avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_ISINTERLEAVED); /* flags */
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    else
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        avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_HASINDEX | AVIF_ISINTERLEAVED); /* flags */
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    avi->frames_hdr_all = avio_tell(pb); /* remember this offset to fill later */
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    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 */
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    if(video_enc){
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        avio_wl32(pb, video_enc->width);
        avio_wl32(pb, video_enc->height);
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    } else {
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        avio_wl32(pb, 0);
        avio_wl32(pb, 0);
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    }
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    avio_wl32(pb, 0); /* reserved */
    avio_wl32(pb, 0); /* reserved */
    avio_wl32(pb, 0); /* reserved */
    avio_wl32(pb, 0); /* reserved */
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    /* stream list */
    for(i=0;i<n;i++) {
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        AVIStream *avist= s->streams[i]->priv_data;
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        list2 = ff_start_tag(pb, "LIST");
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        ffio_wfourcc(pb, "strl");
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        stream = s->streams[i]->codec;
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        /* stream generic header */
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        strh = ff_start_tag(pb, "strh");
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        switch(stream->codec_type) {
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        case AVMEDIA_TYPE_SUBTITLE:
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            // XSUB subtitles behave like video tracks, other subtitles
            // are not (yet) supported.
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            if (stream->codec_id != AV_CODEC_ID_XSUB) {
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                av_log(s, AV_LOG_ERROR, "Subtitle streams other than DivX XSUB are not supported by the AVI muxer.\n");
                return AVERROR_PATCHWELCOME;
            }
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        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;
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        }
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        if(stream->codec_type == AVMEDIA_TYPE_VIDEO ||
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           stream->codec_id == AV_CODEC_ID_XSUB)
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            avio_wl32(pb, stream->codec_tag);
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        else
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            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 */
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        ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);

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        avio_wl32(pb, au_scale); /* scale */
        avio_wl32(pb, au_byterate); /* rate */
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        avpriv_set_pts_info(s->streams[i], 64, au_scale, au_byterate);
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        avio_wl32(pb, 0); /* start */
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        avist->frames_hdr_strm = avio_tell(pb); /* remember this offset to fill later */
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        if (!pb->seekable)
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            avio_wl32(pb, AVI_MAX_RIFF_SIZE); /* FIXME: this may be broken, but who cares */
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        else
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            avio_wl32(pb, 0); /* length, XXX: filled later */
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        /* suggested buffer size */ //FIXME set at the end to largest chunk
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        if(stream->codec_type == AVMEDIA_TYPE_VIDEO)
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            avio_wl32(pb, 1024 * 1024);
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        else if(stream->codec_type == AVMEDIA_TYPE_AUDIO)
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            avio_wl32(pb, 12 * 1024);
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        else
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            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);
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        ff_end_tag(pb, strh);
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      if(stream->codec_type != AVMEDIA_TYPE_DATA){
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        strf = ff_start_tag(pb, "strf");
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        switch(stream->codec_type) {
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        case AVMEDIA_TYPE_SUBTITLE:
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            // XSUB subtitles behave like video tracks, other subtitles
            // are not (yet) supported.
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            if (stream->codec_id != AV_CODEC_ID_XSUB) break;
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        case AVMEDIA_TYPE_VIDEO:
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            ff_put_bmp_header(pb, stream, ff_codec_bmp_tags, 0);
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            break;
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        case AVMEDIA_TYPE_AUDIO:
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            if (ff_put_wav_header(pb, stream) < 0) {
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                return -1;
            }
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            break;
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        default:
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            return -1;
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        }
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        ff_end_tag(pb, strf);
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        if ((t = av_dict_get(s->streams[i]->metadata, "title", NULL, 0))) {
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            avi_write_info_tag(s->pb, "strn", t->value);
            t = NULL;
        }
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      }
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        if (pb->seekable) {
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            unsigned char tag[5];
            int j;
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            /* Starting to lay out AVI OpenDML master index.
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             * 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.
             */
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            avist->indexes.entry = avist->indexes.ents_allocated = 0;
            avist->indexes.indx_start = ff_start_tag(pb, "JUNK");
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            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) */
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            ffio_wfourcc(pb, avi_stream2fourcc(tag, i, stream->codec_type));
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                                    /* dwChunkId */
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            avio_wl64(pb, 0);        /* dwReserved[3]
            avio_wl32(pb, 0);           Must be 0.    */
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            for (j=0; j < AVI_MASTER_INDEX_SIZE * 2; j++)
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                 avio_wl64(pb, 0);
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            ff_end_tag(pb, avist->indexes.indx_start);
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        }
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        if(   stream->codec_type == AVMEDIA_TYPE_VIDEO
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           && s->streams[i]->sample_aspect_ratio.num>0
           && s->streams[i]->sample_aspect_ratio.den>0){
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            int vprp= ff_start_tag(pb, "vprp");
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            AVRational dar = av_mul_q(s->streams[i]->sample_aspect_ratio,
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                                      (AVRational){stream->width, stream->height});
            int num, den;
            av_reduce(&num, &den, dar.num, dar.den, 0xFFFF);

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            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);
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            ff_end_tag(pb, vprp);
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        }

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        ff_end_tag(pb, list2);
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    }
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    if (pb->seekable) {
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        /* AVI could become an OpenDML one, if it grows beyond 2Gb range */
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        avi->odml_list = ff_start_tag(pb, "JUNK");
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        ffio_wfourcc(pb, "odml");
        ffio_wfourcc(pb, "dmlh");
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        avio_wl32(pb, 248);
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        for (i = 0; i < 248; i+= 4)
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             avio_wl32(pb, 0);
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        ff_end_tag(pb, avi->odml_list);
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    }
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    ff_end_tag(pb, list1);
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    list2 = ff_start_tag(pb, "LIST");
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    ffio_wfourcc(pb, "INFO");
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    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)))
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            avi_write_info_tag(s->pb, t->key, t->value);
    }
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    ff_end_tag(pb, list2);
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    /* some padding for easier tag editing */
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    list2 = ff_start_tag(pb, "JUNK");
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    for (i = 0; i < 1016; i += 4)
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        avio_wl32(pb, 0);
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    ff_end_tag(pb, list2);
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    avi->movi_list = ff_start_tag(pb, "LIST");
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    ffio_wfourcc(pb, "movi");
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    avio_flush(pb);
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    return 0;
}

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static int avi_write_ix(AVFormatContext *s)
{
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    AVIOContext *pb = s->pb;
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    AVIContext *avi = s->priv_data;
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    char tag[5];
    char ix_tag[] = "ix00";
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    int i, j;
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    assert(pb->seekable);
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    if (avi->riff_id > AVI_MASTER_INDEX_SIZE)
        return -1;
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    for (i=0;i<s->nb_streams;i++) {
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        AVIStream *avist= s->streams[i]->priv_data;
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         int64_t ix, pos;
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         avi_stream2fourcc(tag, i, s->streams[i]->codec->codec_type);
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         ix_tag[3] = '0' + i;
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         /* Writing AVI OpenDML leaf index chunk */
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         ix = avio_tell(pb);
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         ffio_wfourcc(pb, ix_tag);     /* ix?? */
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         avio_wl32(pb, avist->indexes.entry * 8 + 24);
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                                      /* chunk size */
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         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);
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                                      /* nEntriesInUse */
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         ffio_wfourcc(pb, tag);        /* dwChunkId */
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         avio_wl64(pb, avi->movi_list);/* qwBaseOffset */
         avio_wl32(pb, 0);             /* dwReserved_3 (must be 0) */
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         for (j=0; j<avist->indexes.entry; j++) {
             AVIIentry* ie = avi_get_ientry(&avist->indexes, j);
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             avio_wl32(pb, ie->pos + 8);
             avio_wl32(pb, ((uint32_t)ie->len & ~0x80000000) |
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                          (ie->flags & 0x10 ? 0 : 0x80000000));
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         }
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         avio_flush(pb);
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         pos = avio_tell(pb);
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         /* Updating one entry in the AVI OpenDML master index */
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         avio_seek(pb, avist->indexes.indx_start - 8, SEEK_SET);
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         ffio_wfourcc(pb, "indx");            /* enabling this entry */
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         avio_skip(pb, 8);
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         avio_wl32(pb, avi->riff_id);         /* nEntriesInUse */
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         avio_skip(pb, 16*avi->riff_id);
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         avio_wl64(pb, ix);                   /* qwOffset */
         avio_wl32(pb, pos - ix);             /* dwSize */
         avio_wl32(pb, avist->indexes.entry); /* dwDuration */
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         avio_seek(pb, pos, SEEK_SET);
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    }
    return 0;
}

static int avi_write_idx1(AVFormatContext *s)
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{
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    AVIOContext *pb = s->pb;
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    AVIContext *avi = s->priv_data;
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    int64_t idx_chunk;
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    int i;
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    char tag[5];
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    if (pb->seekable) {
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        AVIStream *avist;
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        AVIIentry* ie = 0, *tie;
        int empty, stream_id = -1;

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

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

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

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static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
    AVIContext *avi = s->priv_data;
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    AVIOContext *pb = s->pb;
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    unsigned char tag[5];
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    unsigned int flags=0;
    const int stream_index= pkt->stream_index;
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    AVIStream *avist= s->streams[stream_index]->priv_data;
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    AVCodecContext *enc= s->streams[stream_index]->codec;
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    int size= pkt->size;
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//    av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %d\n", pkt->dts, avi->packet_count[stream_index], stream_index);
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    while(enc->block_align==0 && pkt->dts != AV_NOPTS_VALUE && pkt->dts > avist->packet_count){
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        AVPacket empty_packet;

        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);
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//        av_log(s, AV_LOG_DEBUG, "dup %"PRId64" %d\n", pkt->dts, avi->packet_count[stream_index]);
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    }
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    avist->packet_count++;
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    // Make sure to put an OpenDML chunk when the file size exceeds the limits
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    if (pb->seekable &&
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        (avio_tell(pb) - avi->riff_start > AVI_MAX_RIFF_SIZE)) {
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        avi_write_ix(s);
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        ff_end_tag(pb, avi->movi_list);
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        if (avi->riff_id == 1)
            avi_write_idx1(s);
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        ff_end_tag(pb, avi->riff_start);
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        avi->movi_list = avi_start_new_riff(s, pb, "AVIX", "movi");
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    }
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    avi_stream2fourcc(tag, stream_index, enc->codec_type);
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    if(pkt->flags&AV_PKT_FLAG_KEY)
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        flags = 0x10;
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    if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
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       avist->audio_strm_length += size;
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    }
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    if (s->pb->seekable) {
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        AVIIndex* idx = &avist->indexes;
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        int cl = idx->entry / AVI_INDEX_CLUSTER_SIZE;
        int id = idx->entry % AVI_INDEX_CLUSTER_SIZE;
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        if (idx->ents_allocated <= idx->entry) {
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            idx->cluster = av_realloc(idx->cluster, (cl+1)*sizeof(void*));
            if (!idx->cluster)
                return -1;
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            idx->cluster[cl] = av_malloc(AVI_INDEX_CLUSTER_SIZE*sizeof(AVIIentry));
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            if (!idx->cluster[cl])
                return -1;
            idx->ents_allocated += AVI_INDEX_CLUSTER_SIZE;
        }
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        idx->cluster[cl][id].flags = flags;
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        idx->cluster[cl][id].pos = avio_tell(pb) - avi->movi_list;
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        idx->cluster[cl][id].len = size;
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        idx->entry++;
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    }
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    avio_write(pb, tag, 4);
    avio_wl32(pb, size);
    avio_write(pb, pkt->data, size);
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    if (size & 1)
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        avio_w8(pb, 0);
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    avio_flush(pb);
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    return 0;
}

static int avi_write_trailer(AVFormatContext *s)
{
    AVIContext *avi = s->priv_data;
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    AVIOContext *pb = s->pb;
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    int res = 0;
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    int i, j, n, nb_frames;
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    int64_t file_size;
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    if (pb->seekable){
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        if (avi->riff_id == 1) {
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            ff_end_tag(pb, avi->movi_list);
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            res = avi_write_idx1(s);
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            ff_end_tag(pb, avi->riff_start);
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        } else {
            avi_write_ix(s);
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            ff_end_tag(pb, avi->movi_list);
            ff_end_tag(pb, avi->riff_start);
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            file_size = avio_tell(pb);
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            avio_seek(pb, avi->odml_list - 8, SEEK_SET);
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            ffio_wfourcc(pb, "LIST"); /* Making this AVI OpenDML one */
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            avio_skip(pb, 16);
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            for (n=nb_frames=0;n<s->nb_streams;n++) {
                AVCodecContext *stream = s->streams[n]->codec;
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                AVIStream *avist= s->streams[n]->priv_data;

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

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