/*
  * 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 "dsputil.h"

 #include "get_bits.h"

 /* Disable the encoder. */
 #undef CONFIG_CLJR_ENCODER

 #define CONFIG_CLJR_ENCODER 0

 typedef struct CLJRContext{
     AVCodecContext *avctx;
     AVFrame picture;
     int delta[16];
     int offset[4];
     GetBitContext gb;
 } CLJRContext;
 

 static int decode_frame(AVCodecContext *avctx,

                         void *data, int *data_size,

                         AVPacket *avpkt)

 {

     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;

     CLJRContext * const a = avctx->priv_data;
     AVFrame *picture = data;
     AVFrame * const p= (AVFrame*)&a->picture;

     int x, y;

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

     if(buf_size/avctx->height < avctx->width) {
         av_log(avctx, AV_LOG_ERROR, "Resolution larger than buffer size. Invalid header?\n");
         return -1;
     }
 

     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;
 

     init_get_bits(&a->gb, buf, buf_size * 8);

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

         uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
         uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];

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

                 luma[3] = get_bits(&a->gb, 5) << 3;
             luma[2] = get_bits(&a->gb, 5) << 3;
             luma[1] = get_bits(&a->gb, 5) << 3;
             luma[0] = get_bits(&a->gb, 5) << 3;
             luma+= 4;
             *(cb++) = get_bits(&a->gb, 6) << 2;
             *(cr++) = get_bits(&a->gb, 6) << 2;

         }
     }
 
     *picture= *(AVFrame*)&a->picture;
     *data_size = sizeof(AVPicture);
 
     emms_c();

     return buf_size;
 }
 

 #if CONFIG_CLJR_ENCODER

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

     p->pict_type= AV_PICTURE_TYPE_I;

     p->key_frame= 1;
 
     emms_c();

     align_put_bits(&a->pb);
     while(get_bit_count(&a->pb)&31)
         put_bits(&a->pb, 8, 0);

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

     return size*4;
 }
 #endif
 

 static av_cold void common_init(AVCodecContext *avctx){

     CLJRContext * const a = avctx->priv_data;
 

     avcodec_get_frame_defaults(&a->picture);

     avctx->coded_frame= (AVFrame*)&a->picture;
     a->avctx= avctx;
 }
 

 static av_cold int decode_init(AVCodecContext *avctx){

     common_init(avctx);

     avctx->pix_fmt= PIX_FMT_YUV411P;

 
     return 0;
 }
 

 #if CONFIG_CLJR_ENCODER

 static av_cold int encode_init(AVCodecContext *avctx){

     common_init(avctx);

     return 0;
 }

 #endif

 AVCodec ff_cljr_decoder = {

     "cljr",

     AVMEDIA_TYPE_VIDEO,

     CODEC_ID_CLJR,
     sizeof(CLJRContext),
     decode_init,
     NULL,

     NULL,

     decode_frame,
     CODEC_CAP_DR1,

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

 };

 #if CONFIG_CLJR_ENCODER

 AVCodec ff_cljr_encoder = {

     "cljr",

     AVMEDIA_TYPE_VIDEO,

     CODEC_ID_CLJR,

     sizeof(CLJRContext),
     encode_init,
     encode_frame,
     //encode_end,

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

 };

 #endif