/*
  * 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 "get_bits.h"
 #include "internal.h"
 
 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   = AV_CODEC_CAP_DR1,

 };