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/*

 * 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 "mpegts.h"

#include "libavformat/avlanguage.h"

#include "libavutil/avstring.h"

#include "libavutil/internal.h"

#include "libavutil/intreadwrite.h"

#include "libavutil/dict.h"

#include "libavutil/avassert.h"

#include "libavutil/timestamp.h"

#include "libavutil/pixdesc.h"

#include "libavcodec/raw.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;

    int64_t     audio_strm_offset;

    int         entry;

    int         ents_allocated;

    int         master_odml_riff_id_base;

    AVIIentry** cluster;

} AVIIndex;

typedef struct AVIContext {

    int64_t riff_start, movi_list, odml_list;

    int64_t frames_hdr_all;

    int riff_id;

} AVIContext;

typedef struct AVIStream {

    int64_t frames_hdr_strm;

    int64_t audio_strm_length;

    int packet_count;

    int entry;

    int max_size;

    int sample_requested;

    int64_t last_dts;

    AVIIndex indexes;

} AVIStream;

static int avi_write_packet(AVFormatContext *s, AVPacket *pkt);

static inline AVIIentry *avi_get_ientry(const 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.audio_strm_offset = avist->audio_strm_length;

        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(s->streams[n], &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 void write_odml_master(AVFormatContext *s, int stream_index)

{

    AVIOContext *pb = s->pb;

    AVStream *st = s->streams[stream_index];

    AVCodecContext *enc = st->codec;

    AVIStream *avist = st->priv_data;

    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.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, stream_index, enc->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);

}

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 *video_enc;

    AVStream *video_st = NULL;

    int64_t list1, list2, strh, strf;

    AVDictionaryEntry *t = NULL;

    int padding;

    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++) {

        AVCodecContext *codec = s->streams[n]->codec;

        bitrate += codec->bit_rate;

        if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {

            video_enc = codec;

            video_st = s->streams[n];

        }

    }

    nb_frames = 0;

    // TODO: should be avg_frame_rate

    if (video_st)

        avio_wl32(pb, (uint32_t) (INT64_C(1000000) * video_st->time_base.num /

                                  video_st->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++) {

        AVStream *st = s->streams[i];

        AVCodecContext *enc = st->codec;

        AVIStream *avist = st->priv_data;

        list2 = ff_start_tag(pb, "LIST");

        ffio_wfourcc(pb, "strl");

        /* stream generic header */

        strh = ff_start_tag(pb, "strh");

        switch (enc->codec_type) {

        case AVMEDIA_TYPE_SUBTITLE:

            // XSUB subtitles behave like video tracks, other subtitles

            // are not (yet) supported.

            if (enc->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 (enc->codec_type == AVMEDIA_TYPE_VIDEO ||

            enc->codec_id == AV_CODEC_ID_XSUB)

            avio_wl32(pb, enc->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(st, &au_byterate, &au_ssize, &au_scale);

        if (   enc->codec_type == AVMEDIA_TYPE_VIDEO

            && enc->codec_id != AV_CODEC_ID_XSUB

            && au_byterate > 1000LL*au_scale) {

            au_byterate = 600;

            au_scale    = 1;

        }

        avpriv_set_pts_info(st, 64, au_scale, au_byterate);

        if (enc->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 */

        /* remember this offset to fill later */

        avist->frames_hdr_strm = avio_tell(pb);

        if (!pb->seekable)

            /* FIXME: this may be broken, but who cares */

            avio_wl32(pb, AVI_MAX_RIFF_SIZE);

        else

            avio_wl32(pb, 0);  /* length, XXX: filled later */

        /* suggested buffer size, is set to largest chunk size in avi_write_trailer */

        if (enc->codec_type == AVMEDIA_TYPE_VIDEO)

            avio_wl32(pb, 1024 * 1024);

        else if (enc->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, enc->width);

        avio_wl16(pb, enc->height);

        ff_end_tag(pb, strh);

        if (enc->codec_type != AVMEDIA_TYPE_DATA) {

            int ret;

            enum AVPixelFormat pix_fmt;

            strf = ff_start_tag(pb, "strf");

            switch (enc->codec_type) {

            case AVMEDIA_TYPE_SUBTITLE:

                /* XSUB subtitles behave like video tracks, other subtitles

                 * are not (yet) supported. */

                if (enc->codec_id != AV_CODEC_ID_XSUB)

                    break;

            case AVMEDIA_TYPE_VIDEO:

                /* WMP expects RGB 5:5:5 rawvideo in avi to have bpp set to 16. */

                if (  !enc->codec_tag

                    && enc->codec_id == AV_CODEC_ID_RAWVIDEO

                    && enc->pix_fmt == AV_PIX_FMT_RGB555LE

                    && enc->bits_per_coded_sample == 15)

                    enc->bits_per_coded_sample = 16;

                ff_put_bmp_header(pb, enc, ff_codec_bmp_tags, 0, 0);

                pix_fmt = avpriv_find_pix_fmt(avpriv_pix_fmt_bps_avi,

                                              enc->bits_per_coded_sample);

                if (   !enc->codec_tag

                    && enc->codec_id == AV_CODEC_ID_RAWVIDEO

                    && enc->pix_fmt != pix_fmt

                    && enc->pix_fmt != AV_PIX_FMT_NONE)

                    av_log(s, AV_LOG_ERROR, "%s rawvideo cannot be written to avi, output file will be unreadable\n",

                          av_get_pix_fmt_name(enc->pix_fmt));

                break;

            case AVMEDIA_TYPE_AUDIO:

                if ((ret = ff_put_wav_header(pb, enc, 0)) < 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(enc->codec_type), "?"));

                return AVERROR(EINVAL);

            }

            ff_end_tag(pb, strf);

            if ((t = av_dict_get(st->metadata, "title", NULL, 0))) {

                ff_riff_write_info_tag(s->pb, "strn", t->value);

                t = NULL;

            }

            if (enc->codec_id == AV_CODEC_ID_XSUB

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

                const char* langstr = av_convert_lang_to(t->value, AV_LANG_ISO639_1);

                t = NULL;

                if (langstr) {

                    char* str = av_asprintf("Subtitle - %s-xx;02", langstr);

                    if (!str)

                        return AVERROR(ENOMEM);

                    ff_riff_write_info_tag(s->pb, "strn", str);

                    av_free(str);

                }

            }

        }

        if (pb->seekable) {

            write_odml_master(s, i);

        }

        if (enc->codec_type == AVMEDIA_TYPE_VIDEO   &&

            st->sample_aspect_ratio.num > 0 &&

            st->sample_aspect_ratio.den > 0) {

            int vprp       = ff_start_tag(pb, "vprp");

            AVRational dar = av_mul_q(st->sample_aspect_ratio,

                                      (AVRational) { enc->width,

                                                     enc->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

            // TODO: should be avg_frame_rate

            avio_wl32(pb, (2LL*st->time_base.den + st->time_base.num - 1) / (2LL * st->time_base.num));

            avio_wl32(pb, enc->width);

            avio_wl32(pb, enc->height);

            avio_wl16(pb, den);

            avio_wl16(pb, num);

            avio_wl32(pb, enc->width);

            avio_wl32(pb, enc->height);

            avio_wl32(pb, 1); // progressive FIXME

            avio_wl32(pb, enc->height);

            avio_wl32(pb, enc->width);

            avio_wl32(pb, enc->height);

            avio_wl32(pb, enc->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);

    padding = s->metadata_header_padding;

    if (padding < 0)

        padding = 1016;

    /* some padding for easier tag editing */

    if (padding) {

        list2 = ff_start_tag(pb, "JUNK");

        for (i = padding; i > 0; 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 void update_odml_entry(AVFormatContext *s, int stream_index, int64_t ix, int size)

{

    AVIOContext *pb = s->pb;

    AVIContext *avi = s->priv_data;

    AVIStream *avist = s->streams[stream_index]->priv_data;

    int64_t pos;

    int au_byterate, au_ssize, au_scale;

    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 - avist->indexes.master_odml_riff_id_base);          /* nEntriesInUse */

    avio_skip(pb, 16 * (avi->riff_id - avist->indexes.master_odml_riff_id_base));

    avio_wl64(pb, ix);                    /* qwOffset */

    avio_wl32(pb, size);                  /* dwSize */

    ff_parse_specific_params(s->streams[stream_index], &au_byterate, &au_ssize, &au_scale);

    if (s->streams[stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO && au_ssize > 0) {

        uint32_t audio_segm_size = (avist->audio_strm_length - avist->indexes.audio_strm_offset);

        if ((audio_segm_size % au_ssize > 0) && !avist->sample_requested) {

            avpriv_request_sample(s, "OpenDML index duration for audio packets with partial frames");

            avist->sample_requested = 1;

        }

        avio_wl32(pb, audio_segm_size / au_ssize);  /* dwDuration (sample count) */

    } else

        avio_wl32(pb, avist->indexes.entry);  /* dwDuration (packet count) */

    avio_seek(pb, pos, SEEK_SET);

}

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);

    for (i = 0; i < s->nb_streams; i++) {

        AVIStream *avist = s->streams[i]->priv_data;

        if (avi->riff_id - avist->indexes.master_odml_riff_id_base == AVI_MASTER_INDEX_SIZE) {

            int64_t pos;

            int size = 8+2+1+1+4+8+4+4+16*AVI_MASTER_INDEX_SIZE;

            pos = avio_tell(pb);

            update_odml_entry(s, i, pos, size);

            write_odml_master(s, i);

            av_assert1(avio_tell(pb) - pos == size);

            avist->indexes.master_odml_riff_id_base = avi->riff_id - 1;

        }

        av_assert0(avi->riff_id - avist->indexes.master_odml_riff_id_base < AVI_MASTER_INDEX_SIZE);

    }

    for (i = 0; i < s->nb_streams; i++) {

        AVIStream *avist = s->streams[i]->priv_data;

        int64_t ix;

        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));

        }

        update_odml_entry(s, i, ix, avio_tell(pb) - ix);

    }

    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 write_skip_frames(AVFormatContext *s, int stream_index, int64_t dts)

{

    AVIStream *avist    = s->streams[stream_index]->priv_data;

    AVCodecContext *enc = s->streams[stream_index]->codec;

    ff_dlog(s, "dts:%s packet_count:%d stream_index:%d\n", av_ts2str(dts), avist->packet_count, stream_index);

    while (enc->block_align == 0 && dts != AV_NOPTS_VALUE &&

           dts > avist->packet_count && enc->codec_id != AV_CODEC_ID_XSUB && avist->packet_count) {

        AVPacket empty_packet;

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

            av_log(s, AV_LOG_ERROR, "Too large number of skipped frames %"PRId64" > 60000\n", 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);

        ff_dlog(s, "dup dts:%s packet_count:%d\n", av_ts2str(dts), avist->packet_count);

    }

    return 0;

}

static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)

{

    unsigned char tag[5];

    unsigned int flags = 0;

    const int stream_index = pkt->stream_index;

    int size               = pkt->size;

    AVIContext *avi     = s->priv_data;

    AVIOContext *pb     = s->pb;

    AVIStream *avist    = s->streams[stream_index]->priv_data;

    AVCodecContext *enc = s->streams[stream_index]->codec;

    int ret;

    if (enc->codec_id == AV_CODEC_ID_H264 && enc->codec_tag == MKTAG('H','2','6','4') && pkt->size) {

        ret = ff_check_h264_startcode(s, s->streams[stream_index], pkt);

        if (ret < 0)

            return ret;

    }

    if ((ret = write_skip_frames(s, stream_index, pkt->dts)) < 0)

        return ret;

    if (pkt->dts != AV_NOPTS_VALUE)

        avist->last_dts = pkt->dts + pkt->duration;

    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) {

                idx->ents_allocated = 0;

                idx->entry          = 0;

                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;

        avist->max_size = FFMAX(avist->max_size, 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);

    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;

    for (i = 0; i < s->nb_streams; i++) {

        AVIStream *avist = s->streams[i]->priv_data;

        write_skip_frames(s, i, avist->last_dts);

    }

    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_freep(&avist->indexes.cluster[j]);

        av_freep(&avist->indexes.cluster);

        avist->indexes.ents_allocated = avist->indexes.entry = 0;

        if (pb->seekable) {

            avio_seek(pb, avist->frames_hdr_strm + 4, SEEK_SET);

            avio_wl32(pb, avist->max_size);

        }

    }

    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

    },

};