21a3e50f88e148862b897d53675f6cd5d00d4e98
[libav.git] / libavcodec / cljr.c
1 /*
2 * Cirrus Logic AccuPak (CLJR) codec
3 * Copyright (c) 2003 Alex Beregszaszi
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 cljr.c
24 * Cirrus Logic AccuPak codec.
25 */
26
27 #include "avcodec.h"
28 #include "dsputil.h"
29 #include "bitstream.h"
30
31 typedef struct CLJRContext{
32 AVCodecContext *avctx;
33 AVFrame picture;
34 int delta[16];
35 int offset[4];
36 GetBitContext gb;
37 } CLJRContext;
38
39 static int decode_frame(AVCodecContext *avctx,
40 void *data, int *data_size,
41 const uint8_t *buf, int buf_size)
42 {
43 CLJRContext * const a = avctx->priv_data;
44 AVFrame *picture = data;
45 AVFrame * const p= (AVFrame*)&a->picture;
46 int x, y;
47
48 if(p->data[0])
49 avctx->release_buffer(avctx, p);
50
51 p->reference= 0;
52 if(avctx->get_buffer(avctx, p) < 0){
53 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
54 return -1;
55 }
56 p->pict_type= FF_I_TYPE;
57 p->key_frame= 1;
58
59 init_get_bits(&a->gb, buf, buf_size);
60
61 for(y=0; y<avctx->height; y++){
62 uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
63 uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
64 uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
65 for(x=0; x<avctx->width; x+=4){
66 luma[3] = get_bits(&a->gb, 5) << 3;
67 luma[2] = get_bits(&a->gb, 5) << 3;
68 luma[1] = get_bits(&a->gb, 5) << 3;
69 luma[0] = get_bits(&a->gb, 5) << 3;
70 luma+= 4;
71 *(cb++) = get_bits(&a->gb, 6) << 2;
72 *(cr++) = get_bits(&a->gb, 6) << 2;
73 }
74 }
75
76 *picture= *(AVFrame*)&a->picture;
77 *data_size = sizeof(AVPicture);
78
79 emms_c();
80
81 return buf_size;
82 }
83
84 #if 0
85 #ifdef CONFIG_CLJR_ENCODER
86 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
87 CLJRContext * const a = avctx->priv_data;
88 AVFrame *pict = data;
89 AVFrame * const p= (AVFrame*)&a->picture;
90 int size;
91 int mb_x, mb_y;
92
93 *p = *pict;
94 p->pict_type= FF_I_TYPE;
95 p->key_frame= 1;
96
97 emms_c();
98
99 align_put_bits(&a->pb);
100 while(get_bit_count(&a->pb)&31)
101 put_bits(&a->pb, 8, 0);
102
103 size= get_bit_count(&a->pb)/32;
104
105 return size*4;
106 }
107 #endif
108 #endif
109
110 static av_cold void common_init(AVCodecContext *avctx){
111 CLJRContext * const a = avctx->priv_data;
112
113 avctx->coded_frame= (AVFrame*)&a->picture;
114 a->avctx= avctx;
115 }
116
117 static av_cold int decode_init(AVCodecContext *avctx){
118
119 common_init(avctx);
120
121 avctx->pix_fmt= PIX_FMT_YUV411P;
122
123 return 0;
124 }
125
126 #if 0
127 #ifdef CONFIG_CLJR_ENCODER
128 static av_cold int encode_init(AVCodecContext *avctx){
129
130 common_init(avctx);
131
132 return 0;
133 }
134 #endif
135 #endif
136
137 AVCodec cljr_decoder = {
138 "cljr",
139 CODEC_TYPE_VIDEO,
140 CODEC_ID_CLJR,
141 sizeof(CLJRContext),
142 decode_init,
143 NULL,
144 NULL,
145 decode_frame,
146 CODEC_CAP_DR1,
147 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
148 };
149 #if 0
150 #ifdef CONFIG_CLJR_ENCODER
151 AVCodec cljr_encoder = {
152 "cljr",
153 CODEC_TYPE_VIDEO,
154 CODEC_ID_cljr,
155 sizeof(CLJRContext),
156 encode_init,
157 encode_frame,
158 //encode_end,
159 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
160 };
161 #endif
162 #endif