libavcodec/vcr1.c

   1 /*
   2  * ATI VCR1 codec
   3  * Copyright (c) 2003 Michael Niedermayer
   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 vcr1.c
  24  * ati vcr1 codec.
  25  */
  26
  27 #include "avcodec.h"
  28 #include "dsputil.h"
  29
  30 //#undef NDEBUG
  31 //#include <assert.h>
  32
  33 typedef struct VCR1Context{
  34     AVCodecContext *avctx;
  35     AVFrame picture;
  36     int delta[16];
  37     int offset[4];
  38 } VCR1Context;
  39
  40 static int decode_frame(AVCodecContext *avctx,
  41                         void *data, int *data_size,
  42                         const uint8_t *buf, int buf_size)
  43 {
  44     VCR1Context * const a = avctx->priv_data;
  45     AVFrame *picture = data;
  46     AVFrame * const p= (AVFrame*)&a->picture;
  47     const uint8_t *bytestream= buf;
  48     int i, x, y;
  49
  50     if(p->data[0])
  51         avctx->release_buffer(avctx, p);
  52
  53     p->reference= 0;
  54     if(avctx->get_buffer(avctx, p) < 0){
  55         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  56         return -1;
  57     }
  58     p->pict_type= FF_I_TYPE;
  59     p->key_frame= 1;
  60
  61     for(i=0; i<16; i++){
  62         a->delta[i]= *(bytestream++);
  63         bytestream++;
  64     }
  65
  66     for(y=0; y<avctx->height; y++){
  67         int offset;
  68         uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
  69
  70         if((y&3) == 0){
  71             uint8_t *cb= &a->picture.data[1][ (y>>2)*a->picture.linesize[1] ];
  72             uint8_t *cr= &a->picture.data[2][ (y>>2)*a->picture.linesize[2] ];
  73
  74             for(i=0; i<4; i++)
  75                 a->offset[i]= *(bytestream++);
  76
  77             offset= a->offset[0] - a->delta[ bytestream[2]&0xF ];
  78             for(x=0; x<avctx->width; x+=4){
  79                 luma[0]=( offset += a->delta[ bytestream[2]&0xF ]);
  80                 luma[1]=( offset += a->delta[ bytestream[2]>>4  ]);
  81                 luma[2]=( offset += a->delta[ bytestream[0]&0xF ]);
  82                 luma[3]=( offset += a->delta[ bytestream[0]>>4  ]);
  83                 luma += 4;
  84
  85                 *(cb++) = bytestream[3];
  86                 *(cr++) = bytestream[1];
  87
  88                 bytestream+= 4;
  89             }
  90         }else{
  91             offset= a->offset[y&3] - a->delta[ bytestream[2]&0xF ];
  92
  93             for(x=0; x<avctx->width; x+=8){
  94                 luma[0]=( offset += a->delta[ bytestream[2]&0xF ]);
  95                 luma[1]=( offset += a->delta[ bytestream[2]>>4  ]);
  96                 luma[2]=( offset += a->delta[ bytestream[3]&0xF ]);
  97                 luma[3]=( offset += a->delta[ bytestream[3]>>4  ]);
  98                 luma[4]=( offset += a->delta[ bytestream[0]&0xF ]);
  99                 luma[5]=( offset += a->delta[ bytestream[0]>>4  ]);
 100                 luma[6]=( offset += a->delta[ bytestream[1]&0xF ]);
 101                 luma[7]=( offset += a->delta[ bytestream[1]>>4  ]);
 102                 luma += 8;
 103                 bytestream+= 4;
 104             }
 105         }
 106     }
 107
 108     *picture= *(AVFrame*)&a->picture;
 109     *data_size = sizeof(AVPicture);
 110
 111     emms_c();
 112
 113     return buf_size;
 114 }
 115
 116 #if 0
 117 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
 118     VCR1Context * const a = avctx->priv_data;
 119     AVFrame *pict = data;
 120     AVFrame * const p= (AVFrame*)&a->picture;
 121     int size;
 122     int mb_x, mb_y;
 123
 124     *p = *pict;
 125     p->pict_type= FF_I_TYPE;
 126     p->key_frame= 1;
 127
 128     emms_c();
 129
 130     align_put_bits(&a->pb);
 131     while(get_bit_count(&a->pb)&31)
 132         put_bits(&a->pb, 8, 0);
 133
 134     size= get_bit_count(&a->pb)/32;
 135
 136     return size*4;
 137 }
 138 #endif
 139
 140 static av_cold void common_init(AVCodecContext *avctx){
 141     VCR1Context * const a = avctx->priv_data;
 142
 143     avctx->coded_frame= (AVFrame*)&a->picture;
 144     a->avctx= avctx;
 145 }
 146
 147 static av_cold int decode_init(AVCodecContext *avctx){
 148
 149     common_init(avctx);
 150
 151     avctx->pix_fmt= PIX_FMT_YUV410P;
 152
 153     return 0;
 154 }
 155
 156 #if 0
 157 static av_cold int encode_init(AVCodecContext *avctx){
 158
 159     common_init(avctx);
 160
 161     return 0;
 162 }
 163 #endif
 164
 165 AVCodec vcr1_decoder = {
 166     "vcr1",
 167     CODEC_TYPE_VIDEO,
 168     CODEC_ID_VCR1,
 169     sizeof(VCR1Context),
 170     decode_init,
 171     NULL,
 172     NULL,
 173     decode_frame,
 174     CODEC_CAP_DR1,
 175     .long_name = "ATI VCR1",
 176 };
 177 #if 0
 178 #ifdef CONFIG_ENCODERS
 179
 180 AVCodec vcr1_encoder = {
 181     "vcr1",
 182     CODEC_TYPE_VIDEO,
 183     CODEC_ID_VCR1,
 184     sizeof(VCR1Context),
 185     encode_init,
 186     encode_frame,
 187     //encode_end,
 188     .long_name = "ATI VCR1",
 189 };
 190
 191 #endif //CONFIG_ENCODERS
 192 #endif