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/*

 * AVS demuxer.

 * Copyright (c) 2006  Aurelien Jacobs 

 *

 * 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 "avformat.h"

#include "voc.h"

typedef struct avs_format {

    VocDecContext voc;

    AVStream *st_video;

    AVStream *st_audio;

    int width;

    int height;

    int bits_per_sample;

    int fps;

    int nb_frames;

    int remaining_frame_size;

    int remaining_audio_size;

} AvsFormat;

typedef enum avs_block_type {

    AVS_NONE      = 0x00,

    AVS_VIDEO     = 0x01,

    AVS_AUDIO     = 0x02,

    AVS_PALETTE   = 0x03,

    AVS_GAME_DATA = 0x04,

} AvsBlockType;

static int avs_probe(AVProbeData * p)

{

    const uint8_t *d;

    d = p->buf;

    if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)

        /* Ensure the buffer probe scores higher than the extension probe.

         * This avoids problems with misdetection as AviSynth scripts. */

        return AVPROBE_SCORE_EXTENSION + 5;

    return 0;

}

static int avs_read_header(AVFormatContext * s)

{

    AvsFormat *avs = s->priv_data;

    s->ctx_flags |= AVFMTCTX_NOHEADER;

    avio_skip(s->pb, 4);

    avs->width = avio_rl16(s->pb);

    avs->height = avio_rl16(s->pb);

    avs->bits_per_sample = avio_rl16(s->pb);

    avs->fps = avio_rl16(s->pb);

    avs->nb_frames = avio_rl32(s->pb);

    avs->remaining_frame_size = 0;

    avs->remaining_audio_size = 0;

    avs->st_video = avs->st_audio = NULL;

    if (avs->width != 318 || avs->height != 198)

        av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d "

               "when the avs format is supposed to be 318x198 only.\n",

               avs->width, avs->height);

    return 0;

}

static int

avs_read_video_packet(AVFormatContext * s, AVPacket * pkt,

                      AvsBlockType type, int sub_type, int size,

                      uint8_t * palette, int palette_size)

{

    AvsFormat *avs = s->priv_data;

    int ret;

    ret = av_new_packet(pkt, size + palette_size);

    if (ret < 0)

        return ret;

    if (palette_size) {

        pkt->data[0] = 0x00;

        pkt->data[1] = 0x03;

        pkt->data[2] = palette_size & 0xFF;

        pkt->data[3] = (palette_size >> 8) & 0xFF;

        memcpy(pkt->data + 4, palette, palette_size - 4);

    }

    pkt->data[palette_size + 0] = sub_type;

    pkt->data[palette_size + 1] = type;

    pkt->data[palette_size + 2] = size & 0xFF;

    pkt->data[palette_size + 3] = (size >> 8) & 0xFF;

    ret = avio_read(s->pb, pkt->data + palette_size + 4, size - 4) + 4;

    if (ret < size) {

        av_free_packet(pkt);

        return AVERROR(EIO);

    }

    pkt->size = ret + palette_size;

    pkt->stream_index = avs->st_video->index;

    if (sub_type == 0)

        pkt->flags |= AV_PKT_FLAG_KEY;

    return 0;

}

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

{

    AvsFormat *avs = s->priv_data;

    int ret, size;

    size = avio_tell(s->pb);

    ret = ff_voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);

    size = avio_tell(s->pb) - size;

    avs->remaining_audio_size -= size;

    if (ret == AVERROR(EIO))

        return 0;    /* this indicate EOS */

    if (ret < 0)

        return ret;

    pkt->stream_index = avs->st_audio->index;

    pkt->flags |= AV_PKT_FLAG_KEY;

    return size;

}

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

{

    AvsFormat *avs = s->priv_data;

    int sub_type = 0, size = 0;

    AvsBlockType type = AVS_NONE;

    int palette_size = 0;

    uint8_t palette[4 + 3 * 256];

    int ret;

    if (avs->remaining_audio_size > 0)

        if (avs_read_audio_packet(s, pkt) > 0)

            return 0;

    while (1) {

        if (avs->remaining_frame_size <= 0) {

            if (!avio_rl16(s->pb))    /* found EOF */

                return AVERROR(EIO);

            avs->remaining_frame_size = avio_rl16(s->pb) - 4;

        }

        while (avs->remaining_frame_size > 0) {

            sub_type = avio_r8(s->pb);

            type = avio_r8(s->pb);

            size = avio_rl16(s->pb);

            if (size < 4)

                return AVERROR_INVALIDDATA;

            avs->remaining_frame_size -= size;

            switch (type) {

            case AVS_PALETTE:

                if (size - 4 > sizeof(palette))

                    return AVERROR_INVALIDDATA;

                ret = avio_read(s->pb, palette, size - 4);

                if (ret < size - 4)

                    return AVERROR(EIO);

                palette_size = size;

                break;

            case AVS_VIDEO:

                if (!avs->st_video) {

                    avs->st_video = avformat_new_stream(s, NULL);

                    if (avs->st_video == NULL)

                        return AVERROR(ENOMEM);

                    avs->st_video->codec->codec_type = AVMEDIA_TYPE_VIDEO;

                    avs->st_video->codec->codec_id = AV_CODEC_ID_AVS;

                    avs->st_video->codec->width = avs->width;

                    avs->st_video->codec->height = avs->height;

                    avs->st_video->codec->bits_per_coded_sample=avs->bits_per_sample;

                    avs->st_video->nb_frames = avs->nb_frames;

#if FF_API_R_FRAME_RATE

                    avs->st_video->r_frame_rate =

#endif

                    avs->st_video->avg_frame_rate = (AVRational){avs->fps, 1};

                }

                return avs_read_video_packet(s, pkt, type, sub_type, size,

                                             palette, palette_size);

            case AVS_AUDIO:

                if (!avs->st_audio) {

                    avs->st_audio = avformat_new_stream(s, NULL);

                    if (avs->st_audio == NULL)

                        return AVERROR(ENOMEM);

                    avs->st_audio->codec->codec_type = AVMEDIA_TYPE_AUDIO;

                }

                avs->remaining_audio_size = size - 4;

                size = avs_read_audio_packet(s, pkt);

                if (size != 0)

                    return size;

                break;

            default:

                avio_skip(s->pb, size - 4);

            }

        }

    }

}

static int avs_read_close(AVFormatContext * s)

{

    return 0;

}

AVInputFormat ff_avs_demuxer = {

    .name           = "avs",

    .long_name      = NULL_IF_CONFIG_SMALL("AVS"),

    .priv_data_size = sizeof(AvsFormat),

    .read_probe     = avs_probe,

    .read_header    = avs_read_header,

    .read_packet    = avs_read_packet,

    .read_close     = avs_read_close,

};