3 * Copyright (c) 2003 Michael Niedermayer
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include "mpegvideo.h"
31 typedef struct VCR1Context{
32 AVCodecContext *avctx;
38 static int decode_frame(AVCodecContext *avctx,
39 void *data, int *data_size,
40 uint8_t *buf, int buf_size)
42 VCR1Context * const a = avctx->priv_data;
43 AVFrame *picture = data;
44 AVFrame * const p= (AVFrame*)&a->picture;
45 uint8_t *bytestream= buf;
49 avctx->release_buffer(avctx, p);
52 if(avctx->get_buffer(avctx, p) < 0){
53 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
60 a->delta[i]= *(bytestream++);
64 for(y=0; y<avctx->height; y++){
66 uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
69 uint8_t *cb= &a->picture.data[1][ (y>>2)*a->picture.linesize[1] ];
70 uint8_t *cr= &a->picture.data[2][ (y>>2)*a->picture.linesize[2] ];
73 a->offset[i]= *(bytestream++);
75 offset= a->offset[0] - a->delta[ bytestream[2]&0xF ];
76 for(x=0; x<avctx->width; x+=4){
77 luma[0]=( offset += a->delta[ bytestream[2]&0xF ]);
78 luma[1]=( offset += a->delta[ bytestream[2]>>4 ]);
79 luma[2]=( offset += a->delta[ bytestream[0]&0xF ]);
80 luma[3]=( offset += a->delta[ bytestream[0]>>4 ]);
83 *(cb++) = bytestream[3];
84 *(cr++) = bytestream[1];
89 offset= a->offset[y&3] - a->delta[ bytestream[2]&0xF ];
91 for(x=0; x<avctx->width; x+=8){
92 luma[0]=( offset += a->delta[ bytestream[2]&0xF ]);
93 luma[1]=( offset += a->delta[ bytestream[2]>>4 ]);
94 luma[2]=( offset += a->delta[ bytestream[3]&0xF ]);
95 luma[3]=( offset += a->delta[ bytestream[3]>>4 ]);
96 luma[4]=( offset += a->delta[ bytestream[0]&0xF ]);
97 luma[5]=( offset += a->delta[ bytestream[0]>>4 ]);
98 luma[6]=( offset += a->delta[ bytestream[1]&0xF ]);
99 luma[7]=( offset += a->delta[ bytestream[1]>>4 ]);
106 *picture= *(AVFrame*)&a->picture;
107 *data_size = sizeof(AVPicture);
115 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
116 VCR1Context * const a = avctx->priv_data;
117 AVFrame *pict = data;
118 AVFrame * const p= (AVFrame*)&a->picture;
123 p->pict_type= I_TYPE;
128 align_put_bits(&a->pb);
129 while(get_bit_count(&a->pb)&31)
130 put_bits(&a->pb, 8, 0);
132 size= get_bit_count(&a->pb)/32;
138 static void common_init(AVCodecContext *avctx){
139 VCR1Context * const a = avctx->priv_data;
141 avctx->coded_frame= (AVFrame*)&a->picture;
145 static int decode_init(AVCodecContext *avctx){
149 avctx->pix_fmt= PIX_FMT_YUV410P;
155 static int encode_init(AVCodecContext *avctx){
163 AVCodec vcr1_decoder = {
175 #ifdef CONFIG_ENCODERS
177 AVCodec vcr1_encoder = {
187 #endif //CONFIG_ENCODERS