/*

 * Cirrus Logic AccuPak (CLJR) decoder

 * Copyright (c) 2003 Alex Beregszaszi

 *

 * 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

 * Cirrus Logic AccuPak decoder.

 */

#include "avcodec.h"

#include "codec_internal.h"

#include "decode.h"

#include "get_bits.h"

static int decode_frame(AVCodecContext *avctx, AVFrame *p,

                        int *got_frame, AVPacket *avpkt)

{

    const uint8_t *buf = avpkt->data;

    int buf_size       = avpkt->size;

    GetBitContext gb;

    int x, y, ret;

    if (avctx->height <= 0 || avctx->width <= 0) {

        av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n");

        return AVERROR_INVALIDDATA;

    }

    if (buf_size / avctx->height < avctx->width) {

        av_log(avctx, AV_LOG_ERROR,

               "Resolution larger than buffer size. Invalid header?\n");

        return AVERROR_INVALIDDATA;

    }

    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)

        return ret;

    init_get_bits(&gb, buf, buf_size * 8);

    for (y = 0; y < avctx->height; y++) {

        uint8_t *luma = &p->data[0][y * p->linesize[0]];

        uint8_t *cb   = &p->data[1][y * p->linesize[1]];

        uint8_t *cr   = &p->data[2][y * p->linesize[2]];

        for (x = 0; x < avctx->width; x += 4) {

            luma[3] = (get_bits(&gb, 5)*33) >> 2;

            luma[2] = (get_bits(&gb, 5)*33) >> 2;

            luma[1] = (get_bits(&gb, 5)*33) >> 2;

            luma[0] = (get_bits(&gb, 5)*33) >> 2;

            luma += 4;

            *(cb++) = get_bits(&gb, 6) << 2;

            *(cr++) = get_bits(&gb, 6) << 2;

        }

    }

    *got_frame = 1;

    return buf_size;

}

static av_cold int decode_init(AVCodecContext *avctx)

{

    avctx->pix_fmt = AV_PIX_FMT_YUV411P;

    return 0;

}

const FFCodec ff_cljr_decoder = {

    .p.name         = "cljr",

    CODEC_LONG_NAME("Cirrus Logic AccuPak"),

    .p.type         = AVMEDIA_TYPE_VIDEO,

    .p.id           = AV_CODEC_ID_CLJR,

    .init           = decode_init,

    FF_CODEC_DECODE_CB(decode_frame),

    .p.capabilities = AV_CODEC_CAP_DR1,

};