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/*
* ATI VCR1 codec
* Copyright (c) 2003 Michael Niedermayer
*
* 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
* ATI VCR1 codec
*/

#include "avcodec.h"
#include "dsputil.h"
#include "libavutil/internal.h"

typedef struct VCR1Context {
    AVFrame picture;
    int delta[16];
    int offset[4];
} VCR1Context;

static av_cold int vcr1_common_init(AVCodecContext *avctx)
{
    VCR1Context *const a = avctx->priv_data;

    avctx->coded_frame = &a->picture;
    avcodec_get_frame_defaults(&a->picture);

    return 0;
}

static av_cold int vcr1_decode_init(AVCodecContext *avctx)
{
    vcr1_common_init(avctx);

    avctx->pix_fmt = PIX_FMT_YUV410P;

    return 0;
}

static av_cold int vcr1_decode_end(AVCodecContext *avctx)
{
    VCR1Context *s = avctx->priv_data;

    if (s->picture.data[0])
        avctx->release_buffer(avctx, &s->picture);

    return 0;
}

static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
                             int *data_size, AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    VCR1Context *const a = avctx->priv_data;
    AVFrame *picture = data;
    AVFrame *const p = &a->picture;
    const uint8_t *bytestream = buf;
    int i, x, y;

    if (p->data[0])
        avctx->release_buffer(avctx, p);

    if(buf_size < 16 + avctx->height + avctx->width*avctx->height*5/8){
        av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
        return AVERROR(EINVAL);
    }

    p->reference = 0;
    if (avctx->get_buffer(avctx, p) < 0) {
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
        return -1;
    }
    p->pict_type = AV_PICTURE_TYPE_I;
    p->key_frame = 1;

    for (i = 0; i < 16; i++) {
        a->delta[i] = *bytestream++;
        bytestream++;
    }

    for (y = 0; y < avctx->height; y++) {
        int offset;
        uint8_t *luma = &a->picture.data[0][y * a->picture.linesize[0]];

        if ((y & 3) == 0) {
            uint8_t *cb = &a->picture.data[1][(y >> 2) * a->picture.linesize[1]];
            uint8_t *cr = &a->picture.data[2][(y >> 2) * a->picture.linesize[2]];

            for (i = 0; i < 4; i++)
                a->offset[i] = *bytestream++;

            offset = a->offset[0] - a->delta[bytestream[2] & 0xF];
            for (x = 0; x < avctx->width; x += 4) {
                luma[0] = offset += a->delta[bytestream[2] & 0xF];
                luma[1] = offset += a->delta[bytestream[2] >> 4];
                luma[2] = offset += a->delta[bytestream[0] & 0xF];
                luma[3] = offset += a->delta[bytestream[0] >> 4];
                luma += 4;

                *cb++ = bytestream[3];
                *cr++ = bytestream[1];

                bytestream += 4;
            }
        } else {
            offset = a->offset[y & 3] - a->delta[bytestream[2] & 0xF];

            for (x = 0; x < avctx->width; x += 8) {
                luma[0] = offset += a->delta[bytestream[2] & 0xF];
                luma[1] = offset += a->delta[bytestream[2] >> 4];
                luma[2] = offset += a->delta[bytestream[3] & 0xF];
                luma[3] = offset += a->delta[bytestream[3] >> 4];
                luma[4] = offset += a->delta[bytestream[0] & 0xF];
                luma[5] = offset += a->delta[bytestream[0] >> 4];
                luma[6] = offset += a->delta[bytestream[1] & 0xF];
                luma[7] = offset += a->delta[bytestream[1] >> 4];
                luma += 8;
                bytestream += 4;
            }
        }
    }

    *picture = a->picture;
    *data_size = sizeof(AVPicture);

    return buf_size;
}

AVCodec ff_vcr1_decoder = {
    .name = "vcr1",
    .type = AVMEDIA_TYPE_VIDEO,
    .id = AV_CODEC_ID_VCR1,
    .priv_data_size = sizeof(VCR1Context),
    .init = vcr1_decode_init,
    .close = vcr1_decode_end,
    .decode = vcr1_decode_frame,
    .capabilities = CODEC_CAP_DR1,
    .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
};

/* Disable the encoder. */
#undef CONFIG_VCR1_ENCODER
#define CONFIG_VCR1_ENCODER 0

#if CONFIG_VCR1_ENCODER

#include "put_bits.h"

static int vcr1_encode_frame(AVCodecContext *avctx, unsigned char *buf,
                             int buf_size, void *data)
{
    VCR1Context *const a = avctx->priv_data;
    AVFrame *pict = data;
    AVFrame *const p = &a->picture;
    int size;

    *p = *pict;
    p->pict_type = AV_PICTURE_TYPE_I;
    p->key_frame = 1;

    avpriv_align_put_bits(&a->pb);
    flush_put_bits(&a->pb);

    size = put_bits_count(&a->pb) / 32;

    return size * 4;
}

AVCodec ff_vcr1_encoder = {
    .name = "vcr1",
    .type = AVMEDIA_TYPE_VIDEO,
    .id = AV_CODEC_ID_VCR1,
    .priv_data_size = sizeof(VCR1Context),
    .init = vcr1_common_init,
    .encode = vcr1_encode_frame,
    .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
};
#endif /* CONFIG_VCR1_ENCODER */
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