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
28 #include "mpegvideo.h"
33 typedef struct VCR1Context{
34 AVCodecContext *avctx;
40 static int decode_frame(AVCodecContext *avctx,
41 void *data, int *data_size,
42 uint8_t *buf, int buf_size)
44 VCR1Context * const a = avctx->priv_data;
45 AVFrame *picture = data;
46 AVFrame * const p= (AVFrame*)&a->picture;
47 uint8_t *bytestream= buf;
51 avctx->release_buffer(avctx, p);
54 if(avctx->get_buffer(avctx, p) < 0){
55 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
62 a->delta[i]= *(bytestream++);
66 for(y=0; y<avctx->height; y++){
68 uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
71 uint8_t *cb= &a->picture.data[1][ (y>>2)*a->picture.linesize[1] ];
72 uint8_t *cr= &a->picture.data[2][ (y>>2)*a->picture.linesize[2] ];
75 a->offset[i]= *(bytestream++);
77 offset= a->offset[0] - a->delta[ bytestream[2]&0xF ];
78 for(x=0; x<avctx->width; x+=4){
79 luma[0]=( offset += a->delta[ bytestream[2]&0xF ]);
80 luma[1]=( offset += a->delta[ bytestream[2]>>4 ]);
81 luma[2]=( offset += a->delta[ bytestream[0]&0xF ]);
82 luma[3]=( offset += a->delta[ bytestream[0]>>4 ]);
85 *(cb++) = bytestream[3];
86 *(cr++) = bytestream[1];
91 offset= a->offset[y&3] - a->delta[ bytestream[2]&0xF ];
93 for(x=0; x<avctx->width; x+=8){
94 luma[0]=( offset += a->delta[ bytestream[2]&0xF ]);
95 luma[1]=( offset += a->delta[ bytestream[2]>>4 ]);
96 luma[2]=( offset += a->delta[ bytestream[3]&0xF ]);
97 luma[3]=( offset += a->delta[ bytestream[3]>>4 ]);
98 luma[4]=( offset += a->delta[ bytestream[0]&0xF ]);
99 luma[5]=( offset += a->delta[ bytestream[0]>>4 ]);
100 luma[6]=( offset += a->delta[ bytestream[1]&0xF ]);
101 luma[7]=( offset += a->delta[ bytestream[1]>>4 ]);
108 *picture= *(AVFrame*)&a->picture;
109 *data_size = sizeof(AVPicture);
117 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
118 VCR1Context * const a = avctx->priv_data;
119 AVFrame *pict = data;
120 AVFrame * const p= (AVFrame*)&a->picture;
125 p->pict_type= I_TYPE;
130 align_put_bits(&a->pb);
131 while(get_bit_count(&a->pb)&31)
132 put_bits(&a->pb, 8, 0);
134 size= get_bit_count(&a->pb)/32;
140 static void common_init(AVCodecContext *avctx){
141 VCR1Context * const a = avctx->priv_data;
143 avctx->coded_frame= (AVFrame*)&a->picture;
147 static int decode_init(AVCodecContext *avctx){
151 avctx->pix_fmt= PIX_FMT_YUV410P;
157 static int encode_init(AVCodecContext *avctx){
165 AVCodec vcr1_decoder = {
177 #ifdef CONFIG_ENCODERS
179 AVCodec vcr1_encoder = {
189 #endif //CONFIG_ENCODERS