/*

 * LucasArts Smush demuxer

 * Copyright (c) 2006 Cyril Zorin

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include "libavutil/intreadwrite.h"

#include "avformat.h"

#include "avio.h"

#include "demux.h"

#include "internal.h"

typedef struct SMUSHContext {

    int version;

    int audio_stream_index;

    int video_stream_index;

} SMUSHContext;

static int smush_read_probe(const AVProbeData *p)

{

    if (((AV_RL32(p->buf)     == MKTAG('S', 'A', 'N', 'M') &&

          AV_RL32(p->buf + 8) == MKTAG('S', 'H', 'D', 'R')) ||

         (AV_RL32(p->buf)     == MKTAG('A', 'N', 'I', 'M') &&

          AV_RL32(p->buf + 8) == MKTAG('A', 'H', 'D', 'R')))) {

        return AVPROBE_SCORE_MAX;

    }

    return 0;

}

static int smush_read_header(AVFormatContext *ctx)

{

    SMUSHContext *smush = ctx->priv_data;

    AVIOContext *pb = ctx->pb;

    AVStream *vst, *ast;

    uint32_t magic, nframes, size, subversion, i;

    uint32_t width = 0, height = 0, got_audio = 0, read = 0;

    uint32_t sample_rate, channels, palette[256], frame_rate = 15;

    int ret;

    magic = avio_rb32(pb);

    avio_skip(pb, 4); // skip movie size

    if (magic == MKBETAG('A', 'N', 'I', 'M')) {

        if (avio_rb32(pb) != MKBETAG('A', 'H', 'D', 'R'))

            return AVERROR_INVALIDDATA;

        size = avio_rb32(pb);

        if (size < 3 * 256 + 6)

            return AVERROR_INVALIDDATA;

        size -= 3 * 256 + 6;

        smush->version = 0;

        subversion     = avio_rl16(pb);

        nframes        = avio_rl16(pb);

        if (!nframes)

            return AVERROR_INVALIDDATA;

        avio_skip(pb, 2); // skip pad

        for (i = 0; i < 256; i++)

            palette[i] = avio_rb24(pb);

        if (subversion > 1) {

            if (size < 12)

                return AVERROR_INVALIDDATA;

            size -= 12;

            frame_rate = avio_rl32(pb);

            avio_skip(pb, 4);            // max size of FRME chunk in file

            sample_rate = avio_rl32(pb);

            if (frame_rate < 1 || frame_rate > 70)

                frame_rate = 12;

        }

        avio_skip(pb, size);

    } else if (magic == MKBETAG('S', 'A', 'N', 'M')) {

        if (avio_rb32(pb) != MKBETAG('S', 'H', 'D', 'R'))

            return AVERROR_INVALIDDATA;

        size = avio_rb32(pb);

        if (size < 14)

            return AVERROR_INVALIDDATA;

        smush->version = 1;

        subversion = avio_rl16(pb);

        nframes = avio_rl32(pb);

        if (!nframes)

            return AVERROR_INVALIDDATA;

        avio_skip(pb, 2); // skip pad

        width  = avio_rl16(pb);

        height = avio_rl16(pb);

        avio_skip(pb, 2); // skip pad

        avio_skip(pb, size - 14);

        if (avio_rb32(pb) != MKBETAG('F', 'L', 'H', 'D'))

            return AVERROR_INVALIDDATA;

        size = avio_rb32(pb);

        while (!got_audio && ((read + 8) < size)) {

            uint32_t sig, chunk_size;

            if (avio_feof(pb))

                return AVERROR_EOF;

            sig        = avio_rb32(pb);

            chunk_size = avio_rb32(pb);

            read      += 8;

            switch (sig) {

            case MKBETAG('W', 'a', 'v', 'e'):

                got_audio = 1;

                sample_rate = avio_rl32(pb);

                if (!sample_rate)

                    return AVERROR_INVALIDDATA;

                channels = avio_rl32(pb);

                if (!channels)

                    return AVERROR_INVALIDDATA;

                avio_skip(pb, chunk_size - 8);

                read += chunk_size;

                break;

            case MKBETAG('B', 'l', '1', '6'):

            case MKBETAG('A', 'N', 'N', 'O'):

                avio_skip(pb, chunk_size);

                read += chunk_size;

                break;

            default:

                return AVERROR_INVALIDDATA;

            }

        }

        avio_skip(pb, size - read);

    } else {

        av_log(ctx, AV_LOG_ERROR, "Wrong magic\n");

        return AVERROR_INVALIDDATA;

    }

    vst = avformat_new_stream(ctx, 0);

    if (!vst)

        return AVERROR(ENOMEM);

    smush->video_stream_index = vst->index;

    avpriv_set_pts_info(vst, 64, 1, frame_rate);

    vst->start_time        = 0;

    vst->duration          =

    vst->nb_frames         = nframes;

    vst->avg_frame_rate    = av_inv_q(vst->time_base);

    vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;

    vst->codecpar->codec_id   = AV_CODEC_ID_SANM;

    vst->codecpar->codec_tag  = 0;

    vst->codecpar->width      = width;

    vst->codecpar->height     = height;

    if (!smush->version) {

        if ((ret = ff_alloc_extradata(vst->codecpar, 1024 + 2)) < 0)

            return ret;

        AV_WL16(vst->codecpar->extradata, subversion);

        for (i = 0; i < 256; i++)

            AV_WL32(vst->codecpar->extradata + 2 + i * 4, palette[i]);

    }

    if (got_audio) {

        ast = avformat_new_stream(ctx, 0);

        if (!ast)

            return AVERROR(ENOMEM);

        smush->audio_stream_index = ast->index;

        ast->start_time         = 0;

        ast->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;

        ast->codecpar->codec_id    = AV_CODEC_ID_ADPCM_VIMA;

        ast->codecpar->codec_tag   = 0;

        ast->codecpar->sample_rate = sample_rate;

        ast->codecpar->ch_layout.nb_channels = channels;

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

    }

    return 0;

}

static int smush_read_packet(AVFormatContext *ctx, AVPacket *pkt)

{

    SMUSHContext *smush = ctx->priv_data;

    AVIOContext *pb = ctx->pb;

    int done = 0;

    int ret;

    while (!done) {

        uint32_t sig, size;

        if (avio_feof(pb))

            return AVERROR_EOF;

        sig  = avio_rb32(pb);

        size = avio_rb32(pb);

        switch (sig) {

        case MKBETAG('F', 'R', 'M', 'E'):

            if (smush->version)

                break;

            if ((ret = av_get_packet(pb, pkt, size)) < 0)

                return ret;

            pkt->stream_index = smush->video_stream_index;

            done = 1;

            break;

        case MKBETAG('B', 'l', '1', '6'):

            if ((ret = av_get_packet(pb, pkt, size)) < 0)

                return ret;

            pkt->stream_index = smush->video_stream_index;

            pkt->duration = 1;

            done = 1;

            break;

        case MKBETAG('W', 'a', 'v', 'e'):

            if (size < 13)

                return AVERROR_INVALIDDATA;

            if (av_get_packet(pb, pkt, size) < 13)

                return AVERROR_INVALIDDATA;

            pkt->stream_index = smush->audio_stream_index;

            pkt->flags       |= AV_PKT_FLAG_KEY;

            pkt->duration     = AV_RB32(pkt->data);

            if (pkt->duration == 0xFFFFFFFFu)

                pkt->duration = AV_RB32(pkt->data + 8);

            done = 1;

            break;

        default:

            avio_skip(pb, size);

            break;

        }

    }

    return 0;

}

const FFInputFormat ff_smush_demuxer = {

    .p.name         = "smush",

    .p.long_name    = NULL_IF_CONFIG_SMALL("LucasArts Smush"),

    .priv_data_size = sizeof(SMUSHContext),

    .read_probe     = smush_read_probe,

    .read_header    = smush_read_header,

    .read_packet    = smush_read_packet,

};