quicktime/ffmpeg/libavcodec/cljr.c

   1 /*
   2  * Cirrus Logic AccuPak (CLJR) codec
   3  * Copyright (c) 2003 Alex Beregszaszi
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  */
  20
  21 /**
  22  * @file cljr.c
  23  * Cirrus Logic AccuPak codec.
  24  */
  25
  26 #include "avcodec.h"
  27 #include "mpegvideo.h"
  28
  29 typedef struct CLJRContext{
  30     AVCodecContext *avctx;
  31     AVFrame picture;
  32     int delta[16];
  33     int offset[4];
  34     GetBitContext gb;
  35 } CLJRContext;
  36
  37 static int decode_frame(AVCodecContext *avctx,
  38                         void *data, int *data_size,
  39                         uint8_t *buf, int buf_size)
  40 {
  41     CLJRContext * const a = avctx->priv_data;
  42     AVFrame *picture = data;
  43     AVFrame * const p= (AVFrame*)&a->picture;
  44     int x, y;
  45
  46     if(p->data[0])
  47         avctx->release_buffer(avctx, p);
  48
  49     p->reference= 0;
  50     if(avctx->get_buffer(avctx, p) < 0){
  51         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  52         return -1;
  53     }
  54     p->pict_type= I_TYPE;
  55     p->key_frame= 1;
  56
  57     init_get_bits(&a->gb, buf, buf_size);
  58
  59     for(y=0; y<avctx->height; y++){
  60         uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
  61         uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
  62         uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
  63         for(x=0; x<avctx->width; x+=4){
  64             luma[3] = get_bits(&a->gb, 5) << 3;
  65             luma[2] = get_bits(&a->gb, 5) << 3;
  66             luma[1] = get_bits(&a->gb, 5) << 3;
  67             luma[0] = get_bits(&a->gb, 5) << 3;
  68             luma+= 4;
  69             *(cb++) = get_bits(&a->gb, 6) << 2;
  70             *(cr++) = get_bits(&a->gb, 6) << 2;
  71         }
  72     }
  73
  74     *picture= *(AVFrame*)&a->picture;
  75     *data_size = sizeof(AVPicture);
  76
  77     emms_c();
  78
  79     return buf_size;
  80 }
  81
  82 #if 0
  83 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
  84     CLJRContext * const a = avctx->priv_data;
  85     AVFrame *pict = data;
  86     AVFrame * const p= (AVFrame*)&a->picture;
  87     int size;
  88     int mb_x, mb_y;
  89
  90     *p = *pict;
  91     p->pict_type= I_TYPE;
  92     p->key_frame= 1;
  93
  94     emms_c();
  95
  96     align_put_bits(&a->pb);
  97     while(get_bit_count(&a->pb)&31)
  98         put_bits(&a->pb, 8, 0);
  99
 100     size= get_bit_count(&a->pb)/32;
 101
 102     return size*4;
 103 }
 104 #endif
 105
 106 static void common_init(AVCodecContext *avctx){
 107     CLJRContext * const a = avctx->priv_data;
 108
 109     avctx->coded_frame= (AVFrame*)&a->picture;
 110     a->avctx= avctx;
 111 }
 112
 113 static int decode_init(AVCodecContext *avctx){
 114
 115     common_init(avctx);
 116
 117     avctx->pix_fmt= PIX_FMT_YUV411P;
 118
 119     return 0;
 120 }
 121
 122 #if 0
 123 static int encode_init(AVCodecContext *avctx){
 124
 125     common_init(avctx);
 126
 127     return 0;
 128 }
 129 #endif
 130
 131 AVCodec cljr_decoder = {
 132     "cljr",
 133     CODEC_TYPE_VIDEO,
 134     CODEC_ID_CLJR,
 135     sizeof(CLJRContext),
 136     decode_init,
 137     NULL,
 138     NULL,
 139     decode_frame,
 140     CODEC_CAP_DR1,
 141 };
 142 #if 0
 143 #ifdef CONFIG_ENCODERS
 144
 145 AVCodec cljr_encoder = {
 146     "cljr",
 147     CODEC_TYPE_VIDEO,
 148     CODEC_ID_cljr,
 149     sizeof(CLJRContext),
 150     encode_init,
 151     encode_frame,
 152     //encode_end,
 153 };
 154
 155 #endif //CONFIG_ENCODERS
 156 #endif