3 * Copyright (c) 2003 Michael Niedermayer
5 * This file is part of FFmpeg.
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.
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.
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
33 /* Disable the encoder. */
34 #undef CONFIG_VCR1_ENCODER
35 #define CONFIG_VCR1_ENCODER 0
37 typedef struct VCR1Context{
38 AVCodecContext *avctx;
44 static int decode_frame(AVCodecContext *avctx,
45 void *data, int *data_size,
46 const uint8_t *buf, int buf_size)
48 VCR1Context * const a = avctx->priv_data;
49 AVFrame *picture = data;
50 AVFrame * const p= (AVFrame*)&a->picture;
51 const uint8_t *bytestream= buf;
55 avctx->release_buffer(avctx, p);
58 if(avctx->get_buffer(avctx, p) < 0){
59 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
62 p->pict_type= FF_I_TYPE;
66 a->delta[i]= *(bytestream++);
70 for(y=0; y<avctx->height; y++){
72 uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[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] ];
79 a->offset[i]= *(bytestream++);
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 ]);
89 *(cb++) = bytestream[3];
90 *(cr++) = bytestream[1];
95 offset= a->offset[y&3] - a->delta[ bytestream[2]&0xF ];
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 ]);
112 *picture= *(AVFrame*)&a->picture;
113 *data_size = sizeof(AVPicture);
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;
129 p->pict_type= FF_I_TYPE;
134 align_put_bits(&a->pb);
135 while(get_bit_count(&a->pb)&31)
136 put_bits(&a->pb, 8, 0);
138 size= get_bit_count(&a->pb)/32;
144 static av_cold void common_init(AVCodecContext *avctx){
145 VCR1Context * const a = avctx->priv_data;
147 avctx->coded_frame= (AVFrame*)&a->picture;
151 static av_cold int decode_init(AVCodecContext *avctx){
155 avctx->pix_fmt= PIX_FMT_YUV410P;
160 #if CONFIG_VCR1_ENCODER
161 static av_cold int encode_init(AVCodecContext *avctx){
169 AVCodec vcr1_decoder = {
179 .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
182 #if CONFIG_VCR1_ENCODER
183 AVCodec vcr1_encoder = {
191 .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),