Statistics
| Branch: | Revision:

ffmpeg / libavcodec / vcr1.c @ 72415b2a

History | View | Annotate | Download (5.21 KB)

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

    
37
typedef struct VCR1Context{
38
    AVCodecContext *avctx;
39
    AVFrame picture;
40
    int delta[16];
41
    int offset[4];
42
} VCR1Context;
43

    
44
static int decode_frame(AVCodecContext *avctx,
45
                        void *data, int *data_size,
46
                        AVPacket *avpkt)
47
{
48
    const uint8_t *buf = avpkt->data;
49
    int buf_size = avpkt->size;
50
    VCR1Context * const a = avctx->priv_data;
51
    AVFrame *picture = data;
52
    AVFrame * const p= (AVFrame*)&a->picture;
53
    const uint8_t *bytestream= buf;
54
    int i, x, y;
55

    
56
    if(p->data[0])
57
        avctx->release_buffer(avctx, p);
58

    
59
    p->reference= 0;
60
    if(avctx->get_buffer(avctx, p) < 0){
61
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
62
        return -1;
63
    }
64
    p->pict_type= FF_I_TYPE;
65
    p->key_frame= 1;
66

    
67
    for(i=0; i<16; i++){
68
        a->delta[i]= *(bytestream++);
69
        bytestream++;
70
    }
71

    
72
    for(y=0; y<avctx->height; y++){
73
        int offset;
74
        uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
75

    
76
        if((y&3) == 0){
77
            uint8_t *cb= &a->picture.data[1][ (y>>2)*a->picture.linesize[1] ];
78
            uint8_t *cr= &a->picture.data[2][ (y>>2)*a->picture.linesize[2] ];
79

    
80
            for(i=0; i<4; i++)
81
                a->offset[i]= *(bytestream++);
82

    
83
            offset= a->offset[0] - a->delta[ bytestream[2]&0xF ];
84
            for(x=0; x<avctx->width; x+=4){
85
                luma[0]=( offset += a->delta[ bytestream[2]&0xF ]);
86
                luma[1]=( offset += a->delta[ bytestream[2]>>4  ]);
87
                luma[2]=( offset += a->delta[ bytestream[0]&0xF ]);
88
                luma[3]=( offset += a->delta[ bytestream[0]>>4  ]);
89
                luma += 4;
90

    
91
                *(cb++) = bytestream[3];
92
                *(cr++) = bytestream[1];
93

    
94
                bytestream+= 4;
95
            }
96
        }else{
97
            offset= a->offset[y&3] - a->delta[ bytestream[2]&0xF ];
98

    
99
            for(x=0; x<avctx->width; x+=8){
100
                luma[0]=( offset += a->delta[ bytestream[2]&0xF ]);
101
                luma[1]=( offset += a->delta[ bytestream[2]>>4  ]);
102
                luma[2]=( offset += a->delta[ bytestream[3]&0xF ]);
103
                luma[3]=( offset += a->delta[ bytestream[3]>>4  ]);
104
                luma[4]=( offset += a->delta[ bytestream[0]&0xF ]);
105
                luma[5]=( offset += a->delta[ bytestream[0]>>4  ]);
106
                luma[6]=( offset += a->delta[ bytestream[1]&0xF ]);
107
                luma[7]=( offset += a->delta[ bytestream[1]>>4  ]);
108
                luma += 8;
109
                bytestream+= 4;
110
            }
111
        }
112
    }
113

    
114
    *picture= *(AVFrame*)&a->picture;
115
    *data_size = sizeof(AVPicture);
116

    
117
    emms_c();
118

    
119
    return buf_size;
120
}
121

    
122
#if CONFIG_VCR1_ENCODER
123
static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
124
    VCR1Context * const a = avctx->priv_data;
125
    AVFrame *pict = data;
126
    AVFrame * const p= (AVFrame*)&a->picture;
127
    int size;
128

    
129
    *p = *pict;
130
    p->pict_type= FF_I_TYPE;
131
    p->key_frame= 1;
132

    
133
    emms_c();
134

    
135
    align_put_bits(&a->pb);
136
    while(get_bit_count(&a->pb)&31)
137
        put_bits(&a->pb, 8, 0);
138

    
139
    size= get_bit_count(&a->pb)/32;
140

    
141
    return size*4;
142
}
143
#endif
144

    
145
static av_cold void common_init(AVCodecContext *avctx){
146
    VCR1Context * const a = avctx->priv_data;
147

    
148
    avctx->coded_frame= (AVFrame*)&a->picture;
149
    a->avctx= avctx;
150
}
151

    
152
static av_cold int decode_init(AVCodecContext *avctx){
153

    
154
    common_init(avctx);
155

    
156
    avctx->pix_fmt= PIX_FMT_YUV410P;
157

    
158
    return 0;
159
}
160

    
161
static av_cold int decode_end(AVCodecContext *avctx){
162
    VCR1Context *s = avctx->priv_data;
163

    
164
    if (s->picture.data[0])
165
        avctx->release_buffer(avctx, &s->picture);
166

    
167
    return 0;
168
}
169

    
170
#if CONFIG_VCR1_ENCODER
171
static av_cold int encode_init(AVCodecContext *avctx){
172

    
173
    common_init(avctx);
174

    
175
    return 0;
176
}
177
#endif
178

    
179
AVCodec vcr1_decoder = {
180
    "vcr1",
181
    AVMEDIA_TYPE_VIDEO,
182
    CODEC_ID_VCR1,
183
    sizeof(VCR1Context),
184
    decode_init,
185
    NULL,
186
    decode_end,
187
    decode_frame,
188
    CODEC_CAP_DR1,
189
    .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
190
};
191

    
192
#if CONFIG_VCR1_ENCODER
193
AVCodec vcr1_encoder = {
194
    "vcr1",
195
    AVMEDIA_TYPE_VIDEO,
196
    CODEC_ID_VCR1,
197
    sizeof(VCR1Context),
198
    encode_init,
199
    encode_frame,
200
    //encode_end,
201
    .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
202
};
203
#endif