1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/*
* Cirrus Logic AccuPak (CLJR) codec
* Copyright (c) 2003 Alex Beregszaszi
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Cirrus Logic AccuPak codec.
*/
#include "avcodec.h"
#include "get_bits.h"
#include "put_bits.h"
typedef struct CLJRContext{
AVCodecContext *avctx;
AVFrame picture;
} CLJRContext;
static int decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
CLJRContext * const a = avctx->priv_data;
GetBitContext gb;
AVFrame *picture = data;
AVFrame * const p= (AVFrame*)&a->picture;
int x, y;
if(p->data[0])
avctx->release_buffer(avctx, p);
if(buf_size/avctx->height < avctx->width) {
av_log(avctx, AV_LOG_ERROR, "Resolution larger than buffer size. Invalid header?\n");
return -1;
}
p->reference= 0;
if(avctx->get_buffer(avctx, p) < 0){
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
p->pict_type= AV_PICTURE_TYPE_I;
p->key_frame= 1;
init_get_bits(&gb, buf, buf_size * 8);
for(y=0; y<avctx->height; y++){
uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
for(x=0; x<avctx->width; x+=4){
luma[3] = get_bits(&gb, 5) << 3;
luma[2] = get_bits(&gb, 5) << 3;
luma[1] = get_bits(&gb, 5) << 3;
luma[0] = get_bits(&gb, 5) << 3;
luma+= 4;
*(cb++) = get_bits(&gb, 6) << 2;
*(cr++) = get_bits(&gb, 6) << 2;
}
}
*picture= *(AVFrame*)&a->picture;
*data_size = sizeof(AVPicture);
emms_c();
return buf_size;
}
#if CONFIG_CLJR_ENCODER
static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
PutBitContext pb;
AVFrame *p = data;
int x, y;
p->pict_type= AV_PICTURE_TYPE_I;
p->key_frame= 1;
init_put_bits(&pb, buf, buf_size / 8);
for (y = 0; y < avctx->height; y++) {
uint8_t *luma = &p->data[0][y * p->linesize[0]];
uint8_t *cb = &p->data[1][y * p->linesize[1]];
uint8_t *cr = &p->data[2][y * p->linesize[2]];
for (x = 0; x < avctx->width; x += 4) {
put_bits(&pb, 5, luma[3] >> 3);
put_bits(&pb, 5, luma[2] >> 3);
put_bits(&pb, 5, luma[1] >> 3);
put_bits(&pb, 5, luma[0] >> 3);
luma += 4;
put_bits(&pb, 6, *(cb++) >> 2);
put_bits(&pb, 6, *(cr++) >> 2);
}
}
flush_put_bits(&pb);
emms_c();
return put_bits_count(&pb) / 8;
}
#endif
static av_cold void common_init(AVCodecContext *avctx){
CLJRContext * const a = avctx->priv_data;
avctx->coded_frame= (AVFrame*)&a->picture;
a->avctx= avctx;
}
static av_cold int decode_init(AVCodecContext *avctx){
common_init(avctx);
avctx->pix_fmt= PIX_FMT_YUV411P;
return 0;
}
static av_cold int decode_end(AVCodecContext *avctx) {
CLJRContext *a = avctx->priv_data;
if (a->picture.data[0])
avctx->release_buffer(avctx, &a->picture);
return 0;
}
#if CONFIG_CLJR_ENCODER
static av_cold int encode_init(AVCodecContext *avctx){
common_init(avctx);
return 0;
}
#endif
AVCodec ff_cljr_decoder = {
.name = "cljr",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_CLJR,
.priv_data_size = sizeof(CLJRContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
};
#if CONFIG_CLJR_ENCODER
AVCodec ff_cljr_encoder = {
.name = "cljr",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_CLJR,
.priv_data_size = sizeof(CLJRContext),
.init = encode_init,
.encode = encode_frame,
.pix_fmts = (const enum PixelFormat[]) { PIX_FMT_YUV411P,
PIX_FMT_NONE },
.long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
};
#endif
|
