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 37typedef struct VCR1Context{ 38 AVCodecContext *avctx; 39 AVFrame picture; 40 int delta[16]; 41 int offset[4]; 42} VCR1Context; 43 44static 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 121static 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 143static 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 150static 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 160static av_cold int encode_init(AVCodecContext *avctx){ 161 162 common_init(avctx); 163 164 return 0; 165} 166#endif 167 168AVCodec 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 182AVCodec 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 193