/*

 * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>

 * Copyright (c) 2010 Peter Ross <pross@xvid.org>

 * Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>

 *

 * 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

 */

/**

 * @file

 * IFF file demuxer

 * by Jaikrishnan Menon

 * for more information on the .iff file format, visit:

 * http://wiki.multimedia.cx/index.php?title=IFF

 */

#include <inttypes.h>

#include "libavutil/avassert.h"

#include "libavutil/channel_layout.h"

#include "libavutil/intreadwrite.h"

#include "libavutil/dict.h"

#include "libavutil/mem.h"

#include "libavcodec/bytestream.h"

#include "avformat.h"

#include "avio_internal.h"

#include "demux.h"

#include "id3v2.h"

#include "internal.h"

#define ID_8SVX       MKTAG('8','S','V','X')

#define ID_16SV       MKTAG('1','6','S','V')

#define ID_MAUD       MKTAG('M','A','U','D')

#define ID_MHDR       MKTAG('M','H','D','R')

#define ID_MDAT       MKTAG('M','D','A','T')

#define ID_VHDR       MKTAG('V','H','D','R')

#define ID_ATAK       MKTAG('A','T','A','K')

#define ID_RLSE       MKTAG('R','L','S','E')

#define ID_CHAN       MKTAG('C','H','A','N')

#define ID_PBM        MKTAG('P','B','M',' ')

#define ID_ILBM       MKTAG('I','L','B','M')

#define ID_BMHD       MKTAG('B','M','H','D')

#define ID_DGBL       MKTAG('D','G','B','L')

#define ID_CAMG       MKTAG('C','A','M','G')

#define ID_CMAP       MKTAG('C','M','A','P')

#define ID_ACBM       MKTAG('A','C','B','M')

#define ID_DEEP       MKTAG('D','E','E','P')

#define ID_RGB8       MKTAG('R','G','B','8')

#define ID_RGBN       MKTAG('R','G','B','N')

#define ID_DSD        MKTAG('D','S','D',' ')

#define ID_DST        MKTAG('D','S','T',' ')

#define ID_DSTC       MKTAG('D','S','T','C')

#define ID_DSTF       MKTAG('D','S','T','F')

#define ID_FRTE       MKTAG('F','R','T','E')

#define ID_ANIM       MKTAG('A','N','I','M')

#define ID_ANHD       MKTAG('A','N','H','D')

#define ID_DLTA       MKTAG('D','L','T','A')

#define ID_DPAN       MKTAG('D','P','A','N')

#define ID_FORM       MKTAG('F','O','R','M')

#define ID_FRM8       MKTAG('F','R','M','8')

#define ID_ANNO       MKTAG('A','N','N','O')

#define ID_AUTH       MKTAG('A','U','T','H')

#define ID_CHRS       MKTAG('C','H','R','S')

#define ID_COPYRIGHT  MKTAG('(','c',')',' ')

#define ID_CSET       MKTAG('C','S','E','T')

#define ID_FVER       MKTAG('F','V','E','R')

#define ID_NAME       MKTAG('N','A','M','E')

#define ID_TEXT       MKTAG('T','E','X','T')

#define ID_ABIT       MKTAG('A','B','I','T')

#define ID_BODY       MKTAG('B','O','D','Y')

#define ID_DBOD       MKTAG('D','B','O','D')

#define ID_DPEL       MKTAG('D','P','E','L')

#define ID_DLOC       MKTAG('D','L','O','C')

#define ID_TVDC       MKTAG('T','V','D','C')

#define LEFT    2

#define RIGHT   4

#define STEREO  6

/**

 * This number of bytes if added at the beginning of each AVPacket

 * which contain additional information about video properties

 * which has to be shared between demuxer and decoder.

 * This number may change between frames, e.g. the demuxer might

 * set it to smallest possible size of 2 to indicate that there's

 * no extradata changing in this frame.

 */

#define IFF_EXTRA_VIDEO_SIZE 41

typedef enum {

    COMP_NONE,

    COMP_FIB,

    COMP_EXP

} svx8_compression_type;

typedef struct IffDemuxContext {

    int      is_64bit;  ///< chunk size is 64-bit

    int64_t  body_pos;

    int64_t  body_end;

    int64_t  sbdy_pos;

    int64_t  resume_pos;

    uint32_t  body_size;

    svx8_compression_type   svx8_compression;

    unsigned  maud_bits;

    unsigned  maud_compression;

    unsigned  bitmap_compression;  ///< delta compression method used

    unsigned  bpp;          ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)

    unsigned  ham;          ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)

    unsigned  flags;        ///< 1 for EHB, 0 is no extra half darkening

    unsigned  transparency; ///< transparency color index in palette

    unsigned  masking;      ///< masking method used

    uint8_t   tvdc[32];     ///< TVDC lookup table

    uint32_t  form_tag;

    int       audio_stream_index;

    int       video_stream_index;

} IffDemuxContext;

/* Metadata string read */

static int get_metadata(AVFormatContext *s,

                        const char *const tag,

                        const unsigned data_size)

{

    uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);

    int res;

    if (!buf)

        return AVERROR(ENOMEM);

    if ((res = ffio_read_size(s->pb, buf, data_size)) < 0) {

        av_free(buf);

        return res;

    }

    buf[data_size] = 0;

    av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);

    return 0;

}

static int iff_probe(const AVProbeData *p)

{

    const uint8_t *d = p->buf;

    if ( (AV_RL32(d)   == ID_FORM &&

         (AV_RL32(d+8) == ID_8SVX ||

          AV_RL32(d+8) == ID_16SV ||

          AV_RL32(d+8) == ID_MAUD ||

          AV_RL32(d+8) == ID_PBM  ||

          AV_RL32(d+8) == ID_ACBM ||

          AV_RL32(d+8) == ID_DEEP ||

          AV_RL32(d+8) == ID_ILBM ||

          AV_RL32(d+8) == ID_RGB8 ||

          AV_RL32(d+8) == ID_ANIM ||

          AV_RL32(d+8) == ID_RGBN)) ||

         (AV_RL32(d) == ID_FRM8 && AV_RL32(d+12) == ID_DSD))

        return AVPROBE_SCORE_MAX;

    return 0;

}

static const AVCodecTag dsd_codec_tags[] = {

    { AV_CODEC_ID_DSD_MSBF, ID_DSD },

    { AV_CODEC_ID_DST,      ID_DST },

    { AV_CODEC_ID_NONE, 0 },

};

#define DSD_SLFT MKTAG('S','L','F','T')

#define DSD_SRGT MKTAG('S','R','G','T')

#define DSD_MLFT MKTAG('M','L','F','T')

#define DSD_MRGT MKTAG('M','R','G','T')

#define DSD_C    MKTAG('C',' ',' ',' ')

#define DSD_LS   MKTAG('L','S',' ',' ')

#define DSD_RS   MKTAG('R','S',' ',' ')

#define DSD_LFE  MKTAG('L','F','E',' ')

static const uint32_t dsd_stereo[]  = { DSD_SLFT, DSD_SRGT };

static const uint32_t dsd_5point0[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LS, DSD_RS };

static const uint32_t dsd_5point1[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LFE, DSD_LS, DSD_RS };

typedef struct {

    AVChannelLayout layout;

    const uint32_t * dsd_layout;

} DSDLayoutDesc;

static const DSDLayoutDesc dsd_channel_layout[] = {

    { AV_CHANNEL_LAYOUT_STEREO,  dsd_stereo },

    { AV_CHANNEL_LAYOUT_5POINT0, dsd_5point0 },

    { AV_CHANNEL_LAYOUT_5POINT1, dsd_5point1 },

};

static const AVChannelLayout dsd_loudspeaker_config[] = {

    AV_CHANNEL_LAYOUT_STEREO,

    { 0 }, { 0 },

    AV_CHANNEL_LAYOUT_5POINT0, AV_CHANNEL_LAYOUT_5POINT1,

};

static const char * dsd_source_comment[] = {

    "dsd_source_comment",

    "analogue_source_comment",

    "pcm_source_comment",

};

static const char * dsd_history_comment[] = {

    "general_remark",

    "operator_name",

    "creating_machine",

    "timezone",

    "file_revision"

};

static int parse_dsd_diin(AVFormatContext *s, AVStream *st, uint64_t eof)

{

    AVIOContext *pb = s->pb;

    while (av_sat_add64(avio_tell(pb), 12) <= eof && !avio_feof(pb)) {

        uint32_t tag      = avio_rl32(pb);

        uint64_t size     = avio_rb64(pb);

        uint64_t orig_pos = avio_tell(pb);

        const char * metadata_tag = NULL;

        if (size >= INT64_MAX)

            return AVERROR_INVALIDDATA;

        switch(tag) {

        case MKTAG('D','I','A','R'): metadata_tag = "artist"; break;

        case MKTAG('D','I','T','I'): metadata_tag = "title";  break;

        }

        if (metadata_tag && size > 4) {

            unsigned int tag_size = avio_rb32(pb);

            int ret = get_metadata(s, metadata_tag, FFMIN(tag_size, size - 4));

            if (ret < 0) {

                av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);

                return ret;

            }

        }

        avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));

    }

    return 0;

}

static int parse_dsd_prop(AVFormatContext *s, AVStream *st, uint64_t eof)

{

    AVIOContext *pb = s->pb;

    char abss[24];

    int hour, min, sec, i, ret, config;

    int dsd_layout[6];

    ID3v2ExtraMeta *id3v2_extra_meta;

    while (av_sat_add64(avio_tell(pb), 12) <= eof && !avio_feof(pb)) {

        uint32_t tag      = avio_rl32(pb);

        uint64_t size     = avio_rb64(pb);

        uint64_t orig_pos = avio_tell(pb);

        if (size >= INT64_MAX)

            return AVERROR_INVALIDDATA;

        switch(tag) {

        case MKTAG('A','B','S','S'):

            if (size < 8)

                return AVERROR_INVALIDDATA;

            hour = avio_rb16(pb);

            min  = avio_r8(pb);

            sec  = avio_r8(pb);

            snprintf(abss, sizeof(abss), "%02dh:%02dm:%02ds:%d", hour, min, sec, avio_rb32(pb));

            av_dict_set(&st->metadata, "absolute_start_time", abss, 0);

            break;

        case MKTAG('C','H','N','L'):

            if (size < 2)

                return AVERROR_INVALIDDATA;

            st->codecpar->ch_layout.order       = AV_CHANNEL_ORDER_UNSPEC;

            st->codecpar->ch_layout.nb_channels = avio_rb16(pb);

            if (size < 2 + st->codecpar->ch_layout.nb_channels * 4 || !st->codecpar->ch_layout.nb_channels)

                return AVERROR_INVALIDDATA;

            if (st->codecpar->ch_layout.nb_channels > FF_ARRAY_ELEMS(dsd_layout)) {

                avpriv_request_sample(s, "channel layout");

                break;

            }

            for (i = 0; i < st->codecpar->ch_layout.nb_channels; i++)

                dsd_layout[i] = avio_rl32(pb);

            for (i = 0; i < FF_ARRAY_ELEMS(dsd_channel_layout); i++) {

                const DSDLayoutDesc * d = &dsd_channel_layout[i];

                if (d->layout.nb_channels == st->codecpar->ch_layout.nb_channels &&

                    !memcmp(d->dsd_layout, dsd_layout, d->layout.nb_channels * sizeof(uint32_t))) {

                    st->codecpar->ch_layout = d->layout;

                    break;

                }

            }

            break;

        case MKTAG('C','M','P','R'):

            if (size < 4)

                return AVERROR_INVALIDDATA;

            st->codecpar->codec_tag = tag = avio_rl32(pb);

            st->codecpar->codec_id = ff_codec_get_id(dsd_codec_tags, tag);

            if (!st->codecpar->codec_id) {

                av_log(s, AV_LOG_ERROR, "'%s' compression is not supported\n",

                       av_fourcc2str(tag));

                return AVERROR_PATCHWELCOME;

            }

            break;

        case MKTAG('F','S',' ',' '):

            if (size < 4)

                return AVERROR_INVALIDDATA;

            st->codecpar->sample_rate = avio_rb32(pb) / 8;

            break;

        case MKTAG('I','D','3',' '):

            ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);

            if (id3v2_extra_meta) {

                if ((ret = ff_id3v2_parse_apic(s, id3v2_extra_meta)) < 0 ||

                    (ret = ff_id3v2_parse_chapters(s, id3v2_extra_meta)) < 0) {

                    ff_id3v2_free_extra_meta(&id3v2_extra_meta);

                    return ret;

                }

                ff_id3v2_free_extra_meta(&id3v2_extra_meta);

            }

            if (size < avio_tell(pb) - orig_pos) {

                av_log(s, AV_LOG_ERROR, "id3 exceeds chunk size\n");

                return AVERROR_INVALIDDATA;

            }

            break;

        case MKTAG('L','S','C','O'):

            if (size < 2)

                return AVERROR_INVALIDDATA;

            config = avio_rb16(pb);

            if (config != 0xFFFF) {

                if (config < FF_ARRAY_ELEMS(dsd_loudspeaker_config))

                    st->codecpar->ch_layout = dsd_loudspeaker_config[config];

                if (!st->codecpar->ch_layout.nb_channels) {

                    avpriv_request_sample(s, "loudspeaker configuration %d", config);

                    return AVERROR_PATCHWELCOME;

                }

            }

            break;

        }

        avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));

    }

    return 0;

}

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

{

    IffDemuxContext *iff = s->priv_data;

    AVIOContext *pb = s->pb;

    uint32_t chunk_id;

    uint64_t chunk_pos, data_pos, data_size;

    int ret = AVERROR_EOF;

    if (s->nb_streams < 1)

        return AVERROR_INVALIDDATA;

    while (!avio_feof(pb)) {

        chunk_pos = avio_tell(pb);

        if (chunk_pos >= iff->body_end)

            return AVERROR_EOF;

        chunk_id = avio_rl32(pb);

        data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);

        data_pos = avio_tell(pb);

        if (data_size < 1 || data_size >= INT64_MAX)

            return AVERROR_INVALIDDATA;

        switch (chunk_id) {

        case ID_DSTF:

            if (!pkt) {

                iff->body_pos  = avio_tell(pb) - (iff->is_64bit ? 12 : 8);

                iff->body_size = iff->body_end - iff->body_pos;

                return 0;

            }

            ret = av_get_packet(pb, pkt, data_size);

            if (ret < 0)

                return ret;

            if (data_size & 1)

                avio_skip(pb, 1);

            pkt->flags |= AV_PKT_FLAG_KEY;

            pkt->stream_index = iff->audio_stream_index;

            pkt->duration = s->streams[0]->codecpar->sample_rate / 75;

            pkt->pos = chunk_pos;

            chunk_pos = avio_tell(pb);

            if (chunk_pos >= iff->body_end)

                return 0;

            avio_seek(pb, chunk_pos, SEEK_SET);

            return 0;

        case ID_FRTE:

            if (data_size < 4)

                return AVERROR_INVALIDDATA;

            s->streams[0]->duration = avio_rb32(pb) * (uint64_t)s->streams[0]->codecpar->sample_rate / 75;

            break;

        }

        avio_skip(pb, data_size - (avio_tell(pb) - data_pos) + (data_size & 1));

    }

    return ret;

}

static const uint8_t deep_rgb24[] = {0, 0, 0, 3, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};

static const uint8_t deep_rgba[]  = {0, 0, 0, 4, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};

static const uint8_t deep_bgra[]  = {0, 0, 0, 4, 0, 3, 0, 8, 0, 2, 0, 8, 0, 1, 0, 8};

static const uint8_t deep_argb[]  = {0, 0, 0, 4, 0,17, 0, 8, 0, 1, 0, 8, 0, 2, 0, 8};

static const uint8_t deep_abgr[]  = {0, 0, 0, 4, 0,17, 0, 8, 0, 3, 0, 8, 0, 2, 0, 8};

static AVStream * new_stream(AVFormatContext *s, AVStream **st_ptr, int *index_ptr, enum AVMediaType codec_type)

{

    if (!*st_ptr) {

        *st_ptr = avformat_new_stream(s, NULL);

        if (!*st_ptr)

            return NULL;

        (*st_ptr)->codecpar->codec_type = codec_type;

        (*index_ptr) = (*st_ptr)->index;

     }

     return *st_ptr;

}

static int iff_read_header(AVFormatContext *s)

{

    IffDemuxContext *iff = s->priv_data;

    AVIOContext *pb = s->pb;

    AVStream *sta = NULL, *stv = NULL;

    uint8_t *buf;

    uint32_t chunk_id;

    uint64_t data_size;

    uint32_t screenmode = 0, num, den;

    unsigned transparency = 0;

    unsigned masking = 0; // no mask

    uint8_t fmt[16];

    int fmt_size;

    iff->audio_stream_index = -1;

    iff->video_stream_index = -1;

    iff->is_64bit = avio_rl32(pb) == ID_FRM8;

    avio_skip(pb, iff->is_64bit ? 8 : 4);

    iff->form_tag = avio_rl32(pb);

    if (iff->form_tag == ID_ANIM) {

        avio_skip(pb, 12);

    }

    iff->bitmap_compression = -1;

    iff->svx8_compression = -1;

    iff->maud_bits = -1;

    iff->maud_compression = -1;

    while(!avio_feof(pb)) {

        uint64_t orig_pos;

        int res;

        const char *metadata_tag = NULL;

        int version, nb_comments, i;

        chunk_id = avio_rl32(pb);

        data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);

        orig_pos = avio_tell(pb);

        if (data_size >= INT64_MAX)

            return AVERROR_INVALIDDATA;

        switch(chunk_id) {

        case ID_VHDR:

            if (data_size < 14)

                return AVERROR_INVALIDDATA;

            if (!new_stream(s, &sta, &iff->audio_stream_index, AVMEDIA_TYPE_AUDIO))

                return AVERROR(ENOMEM);

            avio_skip(pb, 12);

            sta->codecpar->sample_rate = avio_rb16(pb);

            if (data_size >= 16) {

                avio_skip(pb, 1);

                iff->svx8_compression = avio_r8(pb);

            }

            sta->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;

            break;

        case ID_MHDR:

            if (data_size < 32)

                return AVERROR_INVALIDDATA;

            if (!new_stream(s, &sta, &iff->audio_stream_index, AVMEDIA_TYPE_AUDIO))

                return AVERROR(ENOMEM);

            avio_skip(pb, 4);

            iff->maud_bits = avio_rb16(pb);

            avio_skip(pb, 2);

            num = avio_rb32(pb);

            den = avio_rb16(pb);

            if (!den)

                return AVERROR_INVALIDDATA;

            avio_skip(pb, 2);

            sta->codecpar->sample_rate = num / den;

            sta->codecpar->ch_layout.order       = AV_CHANNEL_ORDER_UNSPEC;

            sta->codecpar->ch_layout.nb_channels = avio_rb16(pb);

            iff->maud_compression = avio_rb16(pb);

            if (sta->codecpar->ch_layout.nb_channels == 1)

                sta->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;

            else if (sta->codecpar->ch_layout.nb_channels == 2)

                sta->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;

            else if (sta->codecpar->ch_layout.nb_channels == 0)

                return AVERROR_INVALIDDATA;

            break;

        case ID_ABIT:

        case ID_BODY:

        case ID_DBOD:

        case ID_DSD:

        case ID_DST:

        case ID_MDAT:

            iff->body_pos = avio_tell(pb);

            if (iff->body_pos < 0 || iff->body_pos + data_size > INT64_MAX)

                return AVERROR_INVALIDDATA;

            iff->body_end = iff->body_pos + data_size;

            iff->body_size = data_size;

            if (chunk_id == ID_DST) {

                int ret = read_dst_frame(s, NULL);

                if (ret < 0)

                    return ret;

            }

            break;

        case ID_CHAN:

            if (data_size < 4)

                return AVERROR_INVALIDDATA;

            if (!sta)

                return AVERROR_INVALIDDATA;

            if (avio_rb32(pb) < 6) {

                sta->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;

            } else {

                sta->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;

            }

            break;

        case ID_CAMG:

            if (data_size < 4)

                return AVERROR_INVALIDDATA;

            screenmode                = avio_rb32(pb);

            break;

        case ID_CMAP:

            if (data_size < 3 || data_size > 768 || data_size % 3) {

                 av_log(s, AV_LOG_ERROR, "Invalid CMAP chunk size %"PRIu64"\n",

                        data_size);

                 return AVERROR_INVALIDDATA;

            }

            if (!stv)

                return AVERROR_INVALIDDATA;

            res = ff_alloc_extradata(stv->codecpar,

                                     data_size + IFF_EXTRA_VIDEO_SIZE);

            if (res < 0)

                return res;

            if ((res = avio_read(pb, stv->codecpar->extradata + IFF_EXTRA_VIDEO_SIZE, data_size)) < 0) {

                av_freep(&stv->codecpar->extradata);

                stv->codecpar->extradata_size = 0;

                return res;

            }

            break;

        case ID_BMHD:

            if (data_size <= 8)

                return AVERROR_INVALIDDATA;

            if (!new_stream(s, &stv, &iff->video_stream_index, AVMEDIA_TYPE_VIDEO))

                return AVERROR(ENOMEM);

            stv->codecpar->width                 = avio_rb16(pb);

            stv->codecpar->height                = avio_rb16(pb);

            avio_skip(pb, 4); // x, y offset

            stv->codecpar->bits_per_coded_sample = avio_r8(pb);

            if (data_size >= 10)

                masking                      = avio_r8(pb);

            if (data_size >= 11)

                iff->bitmap_compression      = avio_r8(pb);

            if (data_size >= 14) {

                avio_skip(pb, 1); // padding

                transparency                 = avio_rb16(pb);

            }

            if (data_size >= 16) {

                stv->sample_aspect_ratio.num  = avio_r8(pb);

                stv->sample_aspect_ratio.den  = avio_r8(pb);

            }

            break;

        case ID_ANHD:

            break;

        case ID_DPAN:

            if (!stv)

                return AVERROR_INVALIDDATA;

            avio_skip(pb, 2);

            stv->duration = avio_rb16(pb);

            break;

        case ID_DPEL:

            if (data_size < 4 || (data_size & 3))

                return AVERROR_INVALIDDATA;

            if (!stv)

                return AVERROR_INVALIDDATA;

            if ((fmt_size = avio_read(pb, fmt, sizeof(fmt))) < 0)

                return fmt_size;

            if (fmt_size == sizeof(deep_rgb24) && !memcmp(fmt, deep_rgb24, sizeof(deep_rgb24)))

                stv->codecpar->format = AV_PIX_FMT_RGB24;

            else if (fmt_size == sizeof(deep_rgba) && !memcmp(fmt, deep_rgba, sizeof(deep_rgba)))

                stv->codecpar->format = AV_PIX_FMT_RGBA;

            else if (fmt_size == sizeof(deep_bgra) && !memcmp(fmt, deep_bgra, sizeof(deep_bgra)))

                stv->codecpar->format = AV_PIX_FMT_BGRA;

            else if (fmt_size == sizeof(deep_argb) && !memcmp(fmt, deep_argb, sizeof(deep_argb)))

                stv->codecpar->format = AV_PIX_FMT_ARGB;

            else if (fmt_size == sizeof(deep_abgr) && !memcmp(fmt, deep_abgr, sizeof(deep_abgr)))

                stv->codecpar->format = AV_PIX_FMT_ABGR;

            else {

                avpriv_request_sample(s, "color format %.16s", fmt);

                return AVERROR_PATCHWELCOME;

            }

            break;

        case ID_DGBL:

            if (data_size < 8)

                return AVERROR_INVALIDDATA;

            if (!new_stream(s, &stv, &iff->video_stream_index, AVMEDIA_TYPE_VIDEO))

                return AVERROR(ENOMEM);

            stv->codecpar->width              = avio_rb16(pb);

            stv->codecpar->height             = avio_rb16(pb);

            iff->bitmap_compression          = avio_rb16(pb);

            stv->sample_aspect_ratio.num      = avio_r8(pb);

            stv->sample_aspect_ratio.den      = avio_r8(pb);

            stv->codecpar->bits_per_coded_sample = 24;

            break;

        case ID_DLOC:

            if (data_size < 4)

                return AVERROR_INVALIDDATA;

            if (!new_stream(s, &stv, &iff->video_stream_index, AVMEDIA_TYPE_VIDEO))

                return AVERROR(ENOMEM);

            stv->codecpar->width  = avio_rb16(pb);

            stv->codecpar->height = avio_rb16(pb);

            break;

        case ID_TVDC:

            if (data_size < sizeof(iff->tvdc))

                return AVERROR_INVALIDDATA;

            res = avio_read(pb, iff->tvdc, sizeof(iff->tvdc));

            if (res < 0)

                return res;

            break;

        case MKTAG('S','X','H','D'):

            if (data_size < 22)

                return AVERROR_INVALIDDATA;

            if (!new_stream(s, &sta, &iff->audio_stream_index, AVMEDIA_TYPE_AUDIO))

                return AVERROR(ENOMEM);

            sta->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

            switch(avio_r8(pb)) {

            case 8:

                sta->codecpar->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;

                break;

            default:

                avpriv_request_sample(s, "sound bitdepth");

                return AVERROR_INVALIDDATA;

            }

            avio_skip(pb, 9);

            if (avio_rb32(pb)) {

                avpriv_request_sample(s, "sound compression");

                return AVERROR_INVALIDDATA;

            }

            avio_skip(pb, 1);

            sta->codecpar->ch_layout.nb_channels = avio_r8(pb);

            if (!sta->codecpar->ch_layout.nb_channels)

                return AVERROR_INVALIDDATA;

            if (sta->codecpar->ch_layout.nb_channels == 1)

                sta->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;

            else if (sta->codecpar->ch_layout.nb_channels == 2)

                sta->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;

            sta->codecpar->sample_rate = avio_rb32(pb);

            avpriv_set_pts_info(sta, 64, 1, sta->codecpar->sample_rate);

            avio_skip(pb, 2);

            break;

        case ID_ANNO:

        case ID_TEXT:      metadata_tag = "comment";   break;

        case ID_AUTH:      metadata_tag = "artist";    break;

        case ID_COPYRIGHT: metadata_tag = "copyright"; break;

        case ID_NAME:      metadata_tag = "title";     break;

        /* DSD tags */

        case MKTAG('F','V','E','R'):

            if (iff->form_tag == ID_DSD || iff->form_tag == ID_DST) {

                if (data_size < 4)

                    return AVERROR_INVALIDDATA;

                version = avio_rb32(pb);

                av_log(s, AV_LOG_DEBUG, "DSIFF v%d.%d.%d.%d\n",version >> 24, (version >> 16) & 0xFF, (version >> 8) & 0xFF, version & 0xFF);

                if (!new_stream(s, &sta, &iff->audio_stream_index, AVMEDIA_TYPE_AUDIO))

                    return AVERROR(ENOMEM);

                sta->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

            }

            break;

        case MKTAG('D','I','I','N'):

            if (!sta)

                return AVERROR_INVALIDDATA;

            res = parse_dsd_diin(s, sta, orig_pos + data_size);

            if (res < 0)

                return res;

            break;

        case MKTAG('P','R','O','P'):

            if (data_size < 4)

                return AVERROR_INVALIDDATA;

            if (avio_rl32(pb) != MKTAG('S','N','D',' ')) {

                avpriv_request_sample(s, "unknown property type");

                break;

            }

            if (!sta)

                return AVERROR_INVALIDDATA;

            res = parse_dsd_prop(s, sta, orig_pos + data_size);

            if (res < 0)

                return res;

            break;

        case MKTAG('C','O','M','T'):

            if (data_size < 2)

                return AVERROR_INVALIDDATA;

            if (!sta)

                return AVERROR_INVALIDDATA;

            nb_comments = avio_rb16(pb);

            for (i = 0; i < nb_comments; i++) {

                int year, mon, day, hour, min, type, ref;

                char tmp[24];

                const char *tag;

                int metadata_size;

                year = avio_rb16(pb);

                mon  = avio_r8(pb);

                day  = avio_r8(pb);

                hour = avio_r8(pb);

                min  = avio_r8(pb);

                snprintf(tmp, sizeof(tmp), "%04d-%02d-%02d %02d:%02d", year, mon, day, hour, min);

                av_dict_set(&sta->metadata, "comment_time", tmp, 0);

                type = avio_rb16(pb);

                ref  = avio_rb16(pb);

                switch (type) {

                case 1:

                    if (!i)

                        tag = "channel_comment";

                    else {

                        snprintf(tmp, sizeof(tmp), "channel%d_comment", ref);

                        tag = tmp;

                    }

                    break;

                case 2:

                    tag = ref < FF_ARRAY_ELEMS(dsd_source_comment) ? dsd_source_comment[ref] : "source_comment";

                    break;

                case 3:

                    tag = ref < FF_ARRAY_ELEMS(dsd_history_comment) ? dsd_history_comment[ref] : "file_history";

                    break;

                default:

                    tag = "comment";

                }

                metadata_size  = avio_rb32(pb);

                if ((res = get_metadata(s, tag, metadata_size)) < 0) {

                    av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", tag);

                    return res;

                }

                if (metadata_size & 1)

                    avio_skip(pb, 1);

            }

            break;

        }

        if (metadata_tag) {

            if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {

                av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);

                return res;

            }

        }

        avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));

    }

    if ((!sta && !stv) ||

        (iff->form_tag == ID_ANIM && !stv) ||

        (iff->form_tag != ID_ANIM && sta && stv))

        return AVERROR_INVALIDDATA;

    if (iff->form_tag == ID_ANIM)

        avio_seek(pb, 12, SEEK_SET);

    else

        avio_seek(pb, iff->body_pos, SEEK_SET);

    if (sta) {

        avpriv_set_pts_info(sta, 32, 1, sta->codecpar->sample_rate);

        if (sta->codecpar->codec_id != AV_CODEC_ID_NONE) {

            /* codec_id already set by PROP or SXHD chunk */

        } else if (iff->form_tag == ID_16SV)

            sta->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE_PLANAR;

        else if (iff->form_tag == ID_MAUD) {

            if (iff->maud_bits == 8 && !iff->maud_compression) {

                sta->codecpar->codec_id = AV_CODEC_ID_PCM_U8;

            } else if (iff->maud_bits == 16 && !iff->maud_compression) {

                sta->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;

            } else if (iff->maud_bits ==  8 && iff->maud_compression == 2) {

                sta->codecpar->codec_id = AV_CODEC_ID_PCM_ALAW;

            } else if (iff->maud_bits ==  8 && iff->maud_compression == 3) {

                sta->codecpar->codec_id = AV_CODEC_ID_PCM_MULAW;

            } else {

                avpriv_request_sample(s, "compression %d and bit depth %d", iff->maud_compression, iff->maud_bits);

                return AVERROR_PATCHWELCOME;

            }

        } else {

            switch (iff->svx8_compression) {

            case COMP_NONE:

                sta->codecpar->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;

                break;

            case COMP_FIB:

                sta->codecpar->codec_id = AV_CODEC_ID_8SVX_FIB;

                break;

            case COMP_EXP:

                sta->codecpar->codec_id = AV_CODEC_ID_8SVX_EXP;

                break;

            default:

                av_log(s, AV_LOG_ERROR,

                       "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);

                return -1;

            }

        }

        sta->codecpar->bits_per_coded_sample = av_get_bits_per_sample(sta->codecpar->codec_id);

        sta->codecpar->bit_rate    = (int64_t)sta->codecpar->ch_layout.nb_channels *

                                    sta->codecpar->sample_rate *

                                    sta->codecpar->bits_per_coded_sample;

        sta->codecpar->block_align = sta->codecpar->ch_layout.nb_channels *

                                    sta->codecpar->bits_per_coded_sample;

        if ((sta->codecpar->codec_tag == ID_DSD || iff->form_tag == ID_MAUD) && sta->codecpar->block_align <= 0)

            return AVERROR_INVALIDDATA;

    }

    if (stv) {

        iff->bpp          = stv->codecpar->bits_per_coded_sample;

        if (iff->form_tag == ID_ANIM)

            avpriv_set_pts_info(stv, 32, 1, 60);

        if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {

            iff->ham      = iff->bpp > 6 ? 6 : 4;

            stv->codecpar->bits_per_coded_sample = 24;

        }

        iff->flags        = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;

        iff->masking      = masking;

        iff->transparency = transparency;

        if (!stv->codecpar->extradata) {

            int ret = ff_alloc_extradata(stv->codecpar, IFF_EXTRA_VIDEO_SIZE);

            if (ret < 0)

                return ret;

        }

        av_assert0(stv->codecpar->extradata_size >= IFF_EXTRA_VIDEO_SIZE);

        buf = stv->codecpar->extradata;

        bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);

        bytestream_put_byte(&buf, iff->bitmap_compression);

        bytestream_put_byte(&buf, iff->bpp);

        bytestream_put_byte(&buf, iff->ham);

        bytestream_put_byte(&buf, iff->flags);

        bytestream_put_be16(&buf, iff->transparency);

        bytestream_put_byte(&buf, iff->masking);

        bytestream_put_buffer(&buf, iff->tvdc, sizeof(iff->tvdc));

        stv->codecpar->codec_id = AV_CODEC_ID_IFF_ILBM;

        stv->codecpar->codec_tag = iff->form_tag; // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content

    }

    return 0;

}

static unsigned get_anim_duration(uint8_t *buf, int size)

{

    GetByteContext gb;

    bytestream2_init(&gb, buf, size);

    bytestream2_skip(&gb, 4);

    while (bytestream2_get_bytes_left(&gb) > 8) {

        unsigned chunk = bytestream2_get_le32(&gb);

        unsigned size = bytestream2_get_be32(&gb);

        if (chunk == ID_ANHD) {

            if (size < 40)

                break;

            bytestream2_skip(&gb, 14);

            return bytestream2_get_be32(&gb);

        } else {

            bytestream2_skip(&gb, size + size & 1);

        }

    }

    return 10;

}

static int64_t get_sbdy_offset(uint8_t *buf, int size)

{

    GetByteContext gb;

    bytestream2_init(&gb, buf, size);

    bytestream2_skip(&gb, 4);

    while (bytestream2_get_bytes_left(&gb) > 8) {

        unsigned chunk = bytestream2_get_le32(&gb);

        unsigned size = bytestream2_get_be32(&gb);

        if (chunk == MKTAG('S','B','D','Y'))

            return bytestream2_tell(&gb);

        bytestream2_skip(&gb, size + size & 1);

    }

    return 0;

}

static int iff_read_packet(AVFormatContext *s,

                           AVPacket *pkt)

{

    IffDemuxContext *iff = s->priv_data;

    AVIOContext *pb = s->pb;

    int ret;

    int64_t pos = avio_tell(pb);

    if (avio_feof(pb))

        return AVERROR_EOF;

    if (iff->form_tag != ID_ANIM && pos >= iff->body_end)

        return AVERROR_EOF;

    if (iff->sbdy_pos) {

        int64_t data_size;

        avio_seek(pb, iff->sbdy_pos, SEEK_SET);

        data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);

        ret = av_get_packet(pb, pkt, data_size);

        pkt->stream_index = iff->audio_stream_index;

        pkt->duration = data_size / s->streams[iff->audio_stream_index]->codecpar->ch_layout.nb_channels;

        pkt->pos = INT_MAX; /* not seekable */

        iff->sbdy_pos = 0;

        avio_seek(pb, iff->resume_pos, SEEK_SET);

        return ret;

    }

    if (iff->audio_stream_index >= 0 && iff->video_stream_index < 0) { /* audio only */

        AVStream *sta = s->streams[iff->audio_stream_index];

        if (sta->codecpar->codec_tag == ID_DSD || iff->form_tag == ID_MAUD) {

            ret = av_get_packet(pb, pkt, FFMIN(iff->body_end - pos, 1024 * sta->codecpar->block_align));

        } else if (sta->codecpar->codec_tag == ID_DST) {

            return read_dst_frame(s, pkt);

        } else {

            if (iff->body_size > INT_MAX || !iff->body_size)

                return AVERROR_INVALIDDATA;

            ret = av_get_packet(pb, pkt, iff->body_size);

        }

        pkt->stream_index = iff->audio_stream_index;

    } else if (iff->form_tag == ID_ANIM) {

        uint64_t data_size, orig_pos;

        uint32_t chunk_id, chunk_id2;

        while (!avio_feof(pb)) {

            orig_pos  = avio_tell(pb);

            chunk_id  = avio_rl32(pb);

            data_size = avio_rb32(pb);

            chunk_id2 = avio_rl32(pb);

            if (chunk_id  == ID_FORM &&

                chunk_id2 == ID_ILBM) {

                avio_skip(pb, -4);

                break;

            } else if (chunk_id == ID_FORM &&

                       chunk_id2 == ID_ANIM) {

                continue;

            } else {

                avio_skip(pb, data_size);

            }

        }

        if (pb->eof_reached)

            return AVERROR_EOF;

        ret = av_get_packet(pb, pkt, data_size);

        pkt->stream_index = iff->video_stream_index;

        pkt->pos = orig_pos;

        pkt->duration = get_anim_duration(pkt->data, pkt->size);

        if (pos == 12)

            pkt->flags |= AV_PKT_FLAG_KEY;

        if (iff->audio_stream_index >= 0) {

            iff->sbdy_pos = get_sbdy_offset(pkt->data, pkt->size);

            if (iff->sbdy_pos) {

                iff->sbdy_pos += orig_pos + 4;

                iff->resume_pos = avio_tell(pb);

            }

        }

    } else if (iff->video_stream_index >= 0 && iff->audio_stream_index < 0) { /* video only */

        if (iff->body_size > INT_MAX || !iff->body_size)

            return AVERROR_INVALIDDATA;

        ret = av_get_packet(pb, pkt, iff->body_size);

        pkt->stream_index = iff->video_stream_index;

        pkt->pos = pos;

        if (pos == iff->body_pos)

            pkt->flags |= AV_PKT_FLAG_KEY;

    } else {

        av_assert0(0);

    }

    return ret;

}

const FFInputFormat ff_iff_demuxer = {

    .p.name         = "iff",

    .p.long_name    = NULL_IF_CONFIG_SMALL("IFF (Interchange File Format)"),

    .p.flags        = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,