libavcodec/cljr.c

   1 /*
   2  * Cirrus Logic AccuPak (CLJR) codec
   3  * Copyright (c) 2003 Alex Beregszaszi
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file cljr.c
  24  * Cirrus Logic AccuPak codec.
  25  */
  26
  27 #include "avcodec.h"
  28 #include "dsputil.h"
  29 #include "bitstream.h"
  30
  31 typedef struct CLJRContext{
  32     AVCodecContext *avctx;
  33     AVFrame picture;
  34     int delta[16];
  35     int offset[4];
  36     GetBitContext gb;
  37 } CLJRContext;
  38
  39 static int decode_frame(AVCodecContext *avctx,
  40                         void *data, int *data_size,
  41                         const uint8_t *buf, int buf_size)
  42 {
  43     CLJRContext * const a = avctx->priv_data;
  44     AVFrame *picture = data;
  45     AVFrame * const p= (AVFrame*)&a->picture;
  46     int x, y;
  47
  48     if(p->data[0])
  49         avctx->release_buffer(avctx, p);
  50
  51     p->reference= 0;
  52     if(avctx->get_buffer(avctx, p) < 0){
  53         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  54         return -1;
  55     }
  56     p->pict_type= FF_I_TYPE;
  57     p->key_frame= 1;
  58
  59     init_get_bits(&a->gb, buf, buf_size);
  60
  61     for(y=0; y<avctx->height; y++){
  62         uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
  63         uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
  64         uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
  65         for(x=0; x<avctx->width; x+=4){
  66                 luma[3] = get_bits(&a->gb, 5) << 3;
  67             luma[2] = get_bits(&a->gb, 5) << 3;
  68             luma[1] = get_bits(&a->gb, 5) << 3;
  69             luma[0] = get_bits(&a->gb, 5) << 3;
  70             luma+= 4;
  71             *(cb++) = get_bits(&a->gb, 6) << 2;
  72             *(cr++) = get_bits(&a->gb, 6) << 2;
  73         }
  74     }
  75
  76     *picture= *(AVFrame*)&a->picture;
  77     *data_size = sizeof(AVPicture);
  78
  79     emms_c();
  80
  81     return buf_size;
  82 }
  83
  84 #if 0
  85 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
  86     CLJRContext * const a = avctx->priv_data;
  87     AVFrame *pict = data;
  88     AVFrame * const p= (AVFrame*)&a->picture;
  89     int size;
  90     int mb_x, mb_y;
  91
  92     *p = *pict;
  93     p->pict_type= FF_I_TYPE;
  94     p->key_frame= 1;
  95
  96     emms_c();
  97
  98     align_put_bits(&a->pb);
  99     while(get_bit_count(&a->pb)&31)
 100         put_bits(&a->pb, 8, 0);
 101
 102     size= get_bit_count(&a->pb)/32;
 103
 104     return size*4;
 105 }
 106 #endif
 107
 108 static av_cold void common_init(AVCodecContext *avctx){
 109     CLJRContext * const a = avctx->priv_data;
 110
 111     avctx->coded_frame= (AVFrame*)&a->picture;
 112     a->avctx= avctx;
 113 }
 114
 115 static av_cold int decode_init(AVCodecContext *avctx){
 116
 117     common_init(avctx);
 118
 119     avctx->pix_fmt= PIX_FMT_YUV411P;
 120
 121     return 0;
 122 }
 123
 124 #if 0
 125 static av_cold int encode_init(AVCodecContext *avctx){
 126
 127     common_init(avctx);
 128
 129     return 0;
 130 }
 131 #endif
 132
 133 AVCodec cljr_decoder = {
 134     "cljr",
 135     CODEC_TYPE_VIDEO,
 136     CODEC_ID_CLJR,
 137     sizeof(CLJRContext),
 138     decode_init,
 139     NULL,
 140     NULL,
 141     decode_frame,
 142     CODEC_CAP_DR1,
 143     .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
 144 };
 145 #if 0
 146 #ifdef CONFIG_ENCODERS
 147
 148 AVCodec cljr_encoder = {
 149     "cljr",
 150     CODEC_TYPE_VIDEO,
 151     CODEC_ID_cljr,
 152     sizeof(CLJRContext),
 153     encode_init,
 154     encode_frame,
 155     //encode_end,
 156     .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
 157 };
 158
 159 #endif //CONFIG_ENCODERS
 160 #endif