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 libavcodec/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 /* Disable the encoder. */
  34 #undef CONFIG_VCR1_ENCODER
  35 #define CONFIG_VCR1_ENCODER 0
  36
  37 typedef struct VCR1Context{
  38     AVCodecContext *avctx;
  39     AVFrame picture;
  40     int delta[16];
  41     int offset[4];
  42 } VCR1Context;
  43
  44 static int decode_frame(AVCodecContext *avctx,
  45                         void *data, int *data_size,
  46                         const uint8_t *buf, int buf_size)
  47 {
  48     VCR1Context * const a = avctx->priv_data;
  49     AVFrame *picture = data;
  50     AVFrame * const p= (AVFrame*)&a->picture;
  51     const uint8_t *bytestream= buf;
  52     int i, x, y;
  53
  54     if(p->data[0])
  55         avctx->release_buffer(avctx, p);
  56
  57     p->reference= 0;
  58     if(avctx->get_buffer(avctx, p) < 0){
  59         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  60         return -1;
  61     }
  62     p->pict_type= FF_I_TYPE;
  63     p->key_frame= 1;
  64
  65     for(i=0; i<16; i++){
  66         a->delta[i]= *(bytestream++);
  67         bytestream++;
  68     }
  69
  70     for(y=0; y<avctx->height; y++){
  71         int offset;
  72         uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
  73
  74         if((y&3) == 0){
  75             uint8_t *cb= &a->picture.data[1][ (y>>2)*a->picture.linesize[1] ];
  76             uint8_t *cr= &a->picture.data[2][ (y>>2)*a->picture.linesize[2] ];
  77
  78             for(i=0; i<4; i++)
  79                 a->offset[i]= *(bytestream++);
  80
  81             offset= a->offset[0] - a->delta[ bytestream[2]&0xF ];
  82             for(x=0; x<avctx->width; x+=4){
  83                 luma[0]=( offset += a->delta[ bytestream[2]&0xF ]);
  84                 luma[1]=( offset += a->delta[ bytestream[2]>>4  ]);
  85                 luma[2]=( offset += a->delta[ bytestream[0]&0xF ]);
  86                 luma[3]=( offset += a->delta[ bytestream[0]>>4  ]);
  87                 luma += 4;
  88
  89                 *(cb++) = bytestream[3];
  90                 *(cr++) = bytestream[1];
  91
  92                 bytestream+= 4;
  93             }
  94         }else{
  95             offset= a->offset[y&3] - a->delta[ bytestream[2]&0xF ];
  96
  97             for(x=0; x<avctx->width; x+=8){
  98                 luma[0]=( offset += a->delta[ bytestream[2]&0xF ]);
  99                 luma[1]=( offset += a->delta[ bytestream[2]>>4  ]);
 100                 luma[2]=( offset += a->delta[ bytestream[3]&0xF ]);
 101                 luma[3]=( offset += a->delta[ bytestream[3]>>4  ]);
 102                 luma[4]=( offset += a->delta[ bytestream[0]&0xF ]);
 103                 luma[5]=( offset += a->delta[ bytestream[0]>>4  ]);
 104                 luma[6]=( offset += a->delta[ bytestream[1]&0xF ]);
 105                 luma[7]=( offset += a->delta[ bytestream[1]>>4  ]);
 106                 luma += 8;
 107                 bytestream+= 4;
 108             }
 109         }
 110     }
 111
 112     *picture= *(AVFrame*)&a->picture;
 113     *data_size = sizeof(AVPicture);
 114
 115     emms_c();
 116
 117     return buf_size;
 118 }
 119
 120 #if CONFIG_VCR1_ENCODER
 121 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
 122     VCR1Context * const a = avctx->priv_data;
 123     AVFrame *pict = data;
 124     AVFrame * const p= (AVFrame*)&a->picture;
 125     int size;
 126
 127     *p = *pict;
 128     p->pict_type= FF_I_TYPE;
 129     p->key_frame= 1;
 130
 131     emms_c();
 132
 133     align_put_bits(&a->pb);
 134     while(get_bit_count(&a->pb)&31)
 135         put_bits(&a->pb, 8, 0);
 136
 137     size= get_bit_count(&a->pb)/32;
 138
 139     return size*4;
 140 }
 141 #endif
 142
 143 static av_cold void common_init(AVCodecContext *avctx){
 144     VCR1Context * const a = avctx->priv_data;
 145
 146     avctx->coded_frame= (AVFrame*)&a->picture;
 147     a->avctx= avctx;
 148 }
 149
 150 static av_cold int decode_init(AVCodecContext *avctx){
 151
 152     common_init(avctx);
 153
 154     avctx->pix_fmt= PIX_FMT_YUV410P;
 155
 156     return 0;
 157 }
 158
 159 #if CONFIG_VCR1_ENCODER
 160 static av_cold int encode_init(AVCodecContext *avctx){
 161
 162     common_init(avctx);
 163
 164     return 0;
 165 }
 166 #endif
 167
 168 AVCodec vcr1_decoder = {
 169     "vcr1",
 170     CODEC_TYPE_VIDEO,
 171     CODEC_ID_VCR1,
 172     sizeof(VCR1Context),
 173     decode_init,
 174     NULL,
 175     NULL,
 176     decode_frame,
 177     CODEC_CAP_DR1,
 178     .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
 179 };
 180
 181 #if CONFIG_VCR1_ENCODER
 182 AVCodec vcr1_encoder = {
 183     "vcr1",
 184     CODEC_TYPE_VIDEO,
 185     CODEC_ID_VCR1,
 186     sizeof(VCR1Context),
 187     encode_init,
 188     encode_frame,
 189     //encode_end,
 190     .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
 191 };
 192 #endif