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                         AVPacket *avpkt)
  47 {
  48     const uint8_t *buf = avpkt->data;
  49     int buf_size = avpkt->size;
  50     VCR1Context * const a = avctx->priv_data;
  51     AVFrame *picture = data;
  52     AVFrame * const p= (AVFrame*)&a->picture;
  53     const uint8_t *bytestream= buf;
  54     int i, x, y;
  55
  56     if(p->data[0])
  57         avctx->release_buffer(avctx, p);
  58
  59     p->reference= 0;
  60     if(avctx->get_buffer(avctx, p) < 0){
  61         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  62         return -1;
  63     }
  64     p->pict_type= FF_I_TYPE;
  65     p->key_frame= 1;
  66
  67     for(i=0; i<16; i++){
  68         a->delta[i]= *(bytestream++);
  69         bytestream++;
  70     }
  71
  72     for(y=0; y<avctx->height; y++){
  73         int offset;
  74         uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
  75
  76         if((y&3) == 0){
  77             uint8_t *cb= &a->picture.data[1][ (y>>2)*a->picture.linesize[1] ];
  78             uint8_t *cr= &a->picture.data[2][ (y>>2)*a->picture.linesize[2] ];
  79
  80             for(i=0; i<4; i++)
  81                 a->offset[i]= *(bytestream++);
  82
  83             offset= a->offset[0] - a->delta[ bytestream[2]&0xF ];
  84             for(x=0; x<avctx->width; x+=4){
  85                 luma[0]=( offset += a->delta[ bytestream[2]&0xF ]);
  86                 luma[1]=( offset += a->delta[ bytestream[2]>>4  ]);
  87                 luma[2]=( offset += a->delta[ bytestream[0]&0xF ]);
  88                 luma[3]=( offset += a->delta[ bytestream[0]>>4  ]);
  89                 luma += 4;
  90
  91                 *(cb++) = bytestream[3];
  92                 *(cr++) = bytestream[1];
  93
  94                 bytestream+= 4;
  95             }
  96         }else{
  97             offset= a->offset[y&3] - a->delta[ bytestream[2]&0xF ];
  98
  99             for(x=0; x<avctx->width; x+=8){
 100                 luma[0]=( offset += a->delta[ bytestream[2]&0xF ]);
 101                 luma[1]=( offset += a->delta[ bytestream[2]>>4  ]);
 102                 luma[2]=( offset += a->delta[ bytestream[3]&0xF ]);
 103                 luma[3]=( offset += a->delta[ bytestream[3]>>4  ]);
 104                 luma[4]=( offset += a->delta[ bytestream[0]&0xF ]);
 105                 luma[5]=( offset += a->delta[ bytestream[0]>>4  ]);
 106                 luma[6]=( offset += a->delta[ bytestream[1]&0xF ]);
 107                 luma[7]=( offset += a->delta[ bytestream[1]>>4  ]);
 108                 luma += 8;
 109                 bytestream+= 4;
 110             }
 111         }
 112     }
 113
 114     *picture= *(AVFrame*)&a->picture;
 115     *data_size = sizeof(AVPicture);
 116
 117     emms_c();
 118
 119     return buf_size;
 120 }
 121
 122 #if CONFIG_VCR1_ENCODER
 123 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
 124     VCR1Context * const a = avctx->priv_data;
 125     AVFrame *pict = data;
 126     AVFrame * const p= (AVFrame*)&a->picture;
 127     int size;
 128
 129     *p = *pict;
 130     p->pict_type= FF_I_TYPE;
 131     p->key_frame= 1;
 132
 133     emms_c();
 134
 135     align_put_bits(&a->pb);
 136     while(get_bit_count(&a->pb)&31)
 137         put_bits(&a->pb, 8, 0);
 138
 139     size= get_bit_count(&a->pb)/32;
 140
 141     return size*4;
 142 }
 143 #endif
 144
 145 static av_cold void common_init(AVCodecContext *avctx){
 146     VCR1Context * const a = avctx->priv_data;
 147
 148     avctx->coded_frame= (AVFrame*)&a->picture;
 149     a->avctx= avctx;
 150 }
 151
 152 static av_cold int decode_init(AVCodecContext *avctx){
 153
 154     common_init(avctx);
 155
 156     avctx->pix_fmt= PIX_FMT_YUV410P;
 157
 158     return 0;
 159 }
 160
 161 #if CONFIG_VCR1_ENCODER
 162 static av_cold int encode_init(AVCodecContext *avctx){
 163
 164     common_init(avctx);
 165
 166     return 0;
 167 }
 168 #endif
 169
 170 AVCodec vcr1_decoder = {
 171     "vcr1",
 172     CODEC_TYPE_VIDEO,
 173     CODEC_ID_VCR1,
 174     sizeof(VCR1Context),
 175     decode_init,
 176     NULL,
 177     NULL,
 178     decode_frame,
 179     CODEC_CAP_DR1,
 180     .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
 181 };
 182
 183 #if CONFIG_VCR1_ENCODER
 184 AVCodec vcr1_encoder = {
 185     "vcr1",
 186     CODEC_TYPE_VIDEO,
 187     CODEC_ID_VCR1,
 188     sizeof(VCR1Context),
 189     encode_init,
 190     encode_frame,
 191     //encode_end,
 192     .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
 193 };
 194 #endif