3c6cee5bc2b5700c2fd4030d892769ef63c25412
[libav.git] / 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 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 typedef struct VCR1Context{
34 AVCodecContext *avctx;
35 AVFrame picture;
36 int delta[16];
37 int offset[4];
38 } VCR1Context;
39
40 static int decode_frame(AVCodecContext *avctx,
41 void *data, int *data_size,
42 const uint8_t *buf, int buf_size)
43 {
44 VCR1Context * const a = avctx->priv_data;
45 AVFrame *picture = data;
46 AVFrame * const p= (AVFrame*)&a->picture;
47 const uint8_t *bytestream= buf;
48 int i, x, y;
49
50 if(p->data[0])
51 avctx->release_buffer(avctx, p);
52
53 p->reference= 0;
54 if(avctx->get_buffer(avctx, p) < 0){
55 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
56 return -1;
57 }
58 p->pict_type= FF_I_TYPE;
59 p->key_frame= 1;
60
61 for(i=0; i<16; i++){
62 a->delta[i]= *(bytestream++);
63 bytestream++;
64 }
65
66 for(y=0; y<avctx->height; y++){
67 int offset;
68 uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
69
70 if((y&3) == 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] ];
73
74 for(i=0; i<4; i++)
75 a->offset[i]= *(bytestream++);
76
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 ]);
83 luma += 4;
84
85 *(cb++) = bytestream[3];
86 *(cr++) = bytestream[1];
87
88 bytestream+= 4;
89 }
90 }else{
91 offset= a->offset[y&3] - a->delta[ bytestream[2]&0xF ];
92
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 ]);
102 luma += 8;
103 bytestream+= 4;
104 }
105 }
106 }
107
108 *picture= *(AVFrame*)&a->picture;
109 *data_size = sizeof(AVPicture);
110
111 emms_c();
112
113 return buf_size;
114 }
115
116 #if 0
117 #ifdef CONFIG_VCR1_ENCODER
118 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
119 VCR1Context * const a = avctx->priv_data;
120 AVFrame *pict = data;
121 AVFrame * const p= (AVFrame*)&a->picture;
122 int size;
123 int mb_x, mb_y;
124
125 *p = *pict;
126 p->pict_type= FF_I_TYPE;
127 p->key_frame= 1;
128
129 emms_c();
130
131 align_put_bits(&a->pb);
132 while(get_bit_count(&a->pb)&31)
133 put_bits(&a->pb, 8, 0);
134
135 size= get_bit_count(&a->pb)/32;
136
137 return size*4;
138 }
139 #endif
140 #endif
141
142 static av_cold void common_init(AVCodecContext *avctx){
143 VCR1Context * const a = avctx->priv_data;
144
145 avctx->coded_frame= (AVFrame*)&a->picture;
146 a->avctx= avctx;
147 }
148
149 static av_cold int decode_init(AVCodecContext *avctx){
150
151 common_init(avctx);
152
153 avctx->pix_fmt= PIX_FMT_YUV410P;
154
155 return 0;
156 }
157
158 #if 0
159 #ifdef CONFIG_VCR1_ENCODER
160 static av_cold int encode_init(AVCodecContext *avctx){
161
162 common_init(avctx);
163
164 return 0;
165 }
166 #endif
167 #endif
168
169 AVCodec vcr1_decoder = {
170 "vcr1",
171 CODEC_TYPE_VIDEO,
172 CODEC_ID_VCR1,
173 sizeof(VCR1Context),
174 decode_init,
175 NULL,
176 NULL,
177 decode_frame,
178 CODEC_CAP_DR1,
179 .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
180 };
181 #if 0
182 #ifdef CONFIG_VCR1_ENCODER
183 AVCodec vcr1_encoder = {
184 "vcr1",
185 CODEC_TYPE_VIDEO,
186 CODEC_ID_VCR1,
187 sizeof(VCR1Context),
188 encode_init,
189 encode_frame,
190 //encode_end,
191 .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
192 };
193 #endif
194 #endif