Statistics
| Branch: | Revision:

ffmpeg / libavcodec / cljr.c @ 86807410

History | View | Annotate | Download (3.79 KB)

1
/*
2
 * Cirrus Logic AccuPak (CLJR) codec
3
 * Copyright (c) 2003 Alex Beregszaszi
4
 *
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.
9
 *
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.
14
 *
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
18
 *
19
 */
20
 
21
/**
22
 * @file cljr.c
23
 * Cirrus Logic AccuPak codec.
24
 */
25
 
26
#include "avcodec.h"
27
#include "mpegvideo.h"
28

    
29
typedef struct CLJRContext{
30
    AVCodecContext *avctx;
31
    AVFrame picture;
32
    int delta[16];
33
    int offset[4];
34
    GetBitContext gb;
35
} CLJRContext;
36

    
37
static int decode_frame(AVCodecContext *avctx, 
38
                        void *data, int *data_size,
39
                        uint8_t *buf, int buf_size)
40
{
41
    CLJRContext * const a = avctx->priv_data;
42
    AVFrame *picture = data;
43
    AVFrame * const p= (AVFrame*)&a->picture;
44
    int x, y;
45

    
46
    *data_size = 0;
47

    
48
    /* special case for last picture */
49
    if (buf_size == 0) {
50
        return 0;
51
    }
52

    
53
    if(p->data[0])
54
        avctx->release_buffer(avctx, p);
55

    
56
    p->reference= 0;
57
    if(avctx->get_buffer(avctx, p) < 0){
58
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
59
        return -1;
60
    }
61
    p->pict_type= I_TYPE;
62
    p->key_frame= 1;
63

    
64
    init_get_bits(&a->gb, buf, buf_size);
65

    
66
    for(y=0; y<avctx->height; y++){
67
        uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
68
        uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
69
        uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
70
        for(x=0; x<avctx->width; x+=4){
71
                luma[3] = get_bits(&a->gb, 5) << 3;
72
            luma[2] = get_bits(&a->gb, 5) << 3;
73
            luma[1] = get_bits(&a->gb, 5) << 3;
74
            luma[0] = get_bits(&a->gb, 5) << 3;
75
            luma+= 4;
76
            *(cb++) = get_bits(&a->gb, 6) << 2;
77
            *(cr++) = get_bits(&a->gb, 6) << 2;
78
        }
79
    }
80

    
81
    *picture= *(AVFrame*)&a->picture;
82
    *data_size = sizeof(AVPicture);
83

    
84
    emms_c();
85
    
86
    return buf_size;
87
}
88

    
89
#if 0
90
static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
91
    CLJRContext * const a = avctx->priv_data;
92
    AVFrame *pict = data;
93
    AVFrame * const p= (AVFrame*)&a->picture;
94
    int size;
95
    int mb_x, mb_y;
96

97
    *p = *pict;
98
    p->pict_type= I_TYPE;
99
    p->key_frame= 1;
100

101
    emms_c();
102
    
103
    align_put_bits(&a->pb);
104
    while(get_bit_count(&a->pb)&31)
105
        put_bits(&a->pb, 8, 0);
106
    
107
    size= get_bit_count(&a->pb)/32;
108
    
109
    return size*4;
110
}
111
#endif
112

    
113
static void common_init(AVCodecContext *avctx){
114
    CLJRContext * const a = avctx->priv_data;
115

    
116
    avctx->coded_frame= (AVFrame*)&a->picture;
117
    a->avctx= avctx;
118
}
119

    
120
static int decode_init(AVCodecContext *avctx){
121

    
122
    common_init(avctx);
123
    
124
    avctx->pix_fmt= PIX_FMT_YUV411P;
125

    
126
    return 0;
127
}
128

    
129
static int encode_init(AVCodecContext *avctx){
130

    
131
    common_init(avctx);
132
    
133
    return 0;
134
}
135

    
136
static int decode_end(AVCodecContext *avctx){
137

    
138
    avcodec_default_free_buffers(avctx);
139

    
140
    return 0;
141
}
142

    
143
AVCodec cljr_decoder = {
144
    "cljr",
145
    CODEC_TYPE_VIDEO,
146
    CODEC_ID_CLJR,
147
    sizeof(CLJRContext),
148
    decode_init,
149
    NULL,
150
    decode_end,
151
    decode_frame,
152
    CODEC_CAP_DR1,
153
};
154
#if 0
155
#ifdef CONFIG_ENCODERS
156

157
AVCodec cljr_encoder = {
158
    "cljr",
159
    CODEC_TYPE_VIDEO,
160
    CODEC_ID_cljr,
161
    sizeof(CLJRContext),
162
    encode_init,
163
    encode_frame,
164
    //encode_end,
165
};
166

167
#endif //CONFIG_ENCODERS
168
#endif