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/*

 * Cirrus Logic AccuPak (CLJR) codec

 * 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 codec.

 */

#include "avcodec.h"

#include "libavutil/opt.h"

#include "get_bits.h"

#include "internal.h"

#include "put_bits.h"

#if CONFIG_CLJR_DECODER

static int decode_frame(AVCodecContext *avctx,

                        void *data, int *got_frame,

                        AVPacket *avpkt)

{

    const uint8_t *buf = avpkt->data;

    int buf_size       = avpkt->size;

    GetBitContext gb;

    AVFrame * const p = data;

    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;

    p->pict_type = AV_PICTURE_TYPE_I;

    p->key_frame = 1;

    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;

}

AVCodec ff_cljr_decoder = {

    .name           = "cljr",

    .long_name      = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = AV_CODEC_ID_CLJR,

    .init           = decode_init,

    .decode         = decode_frame,

    .capabilities   = CODEC_CAP_DR1,

};

#endif

#if CONFIG_CLJR_ENCODER

typedef struct CLJRContext {

    AVClass        *avclass;

    AVFrame         picture;

    int             dither_type;

} CLJRContext;

static av_cold int encode_init(AVCodecContext *avctx)

{

    CLJRContext * const a = avctx->priv_data;

    avctx->coded_frame = &a->picture;

    return 0;

}

static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,

                        const AVFrame *p, int *got_packet)

{

    CLJRContext *a = avctx->priv_data;

    PutBitContext pb;

    int x, y, ret;

    uint32_t dither= avctx->frame_number;

    static const uint32_t ordered_dither[2][2] =

    {

        { 0x10400000, 0x104F0000 },

        { 0xCB2A0000, 0xCB250000 },

    };

    if ((ret = ff_alloc_packet2(avctx, pkt, 32*avctx->height*avctx->width/4)) < 0)

        return ret;

    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;

    avctx->coded_frame->key_frame = 1;

    init_put_bits(&pb, pkt->data, pkt->size);

    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) {

            switch (a->dither_type) {

            case 0: dither = 0x492A0000;                       break;

            case 1: dither = dither * 1664525 + 1013904223;    break;

            case 2: dither = ordered_dither[ y&1 ][ (x>>2)&1 ];break;

            }

            put_bits(&pb, 5, (249*(luma[3] +  (dither>>29)   )) >> 11);

            put_bits(&pb, 5, (249*(luma[2] + ((dither>>26)&7))) >> 11);

            put_bits(&pb, 5, (249*(luma[1] + ((dither>>23)&7))) >> 11);

            put_bits(&pb, 5, (249*(luma[0] + ((dither>>20)&7))) >> 11);

            luma += 4;

            put_bits(&pb, 6, (253*(*(cb++) + ((dither>>18)&3))) >> 10);

            put_bits(&pb, 6, (253*(*(cr++) + ((dither>>16)&3))) >> 10);

        }

    }

    flush_put_bits(&pb);

    pkt->size   = put_bits_count(&pb) / 8;

    pkt->flags |= AV_PKT_FLAG_KEY;

    *got_packet = 1;

    return 0;

}

#define OFFSET(x) offsetof(CLJRContext, x)

#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

static const AVOption options[] = {

    { "dither_type",   "Dither type",   OFFSET(dither_type),        AV_OPT_TYPE_INT, { .i64=1 }, 0, 2, VE},

    { NULL },

};

static const AVClass cljr_class = {

    .class_name = "cljr encoder",

    .item_name  = av_default_item_name,

    .option     = options,

    .version    = LIBAVUTIL_VERSION_INT,

};

AVCodec ff_cljr_encoder = {

    .name           = "cljr",

    .long_name      = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = AV_CODEC_ID_CLJR,

    .priv_data_size = sizeof(CLJRContext),

    .init           = encode_init,

    .encode2        = encode_frame,

    .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,

                                                   AV_PIX_FMT_NONE },

    .priv_class     = &cljr_class,

};

#endif