new opensource lossy/lossless audio codec based on speech compression techniques...
[libav.git] / libavcodec / cljr.c
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 /* special case for last picture */
47 if (buf_size == 0) {
48 return 0;
49 }
50
51 if(p->data[0])
52 avctx->release_buffer(avctx, p);
53
54 p->reference= 0;
55 if(avctx->get_buffer(avctx, p) < 0){
56 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
57 return -1;
58 }
59 p->pict_type= I_TYPE;
60 p->key_frame= 1;
61
62 init_get_bits(&a->gb, buf, buf_size);
63
64 for(y=0; y<avctx->height; y++){
65 uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
66 uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
67 uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
68 for(x=0; x<avctx->width; x+=4){
69 luma[3] = get_bits(&a->gb, 5) << 3;
70 luma[2] = get_bits(&a->gb, 5) << 3;
71 luma[1] = get_bits(&a->gb, 5) << 3;
72 luma[0] = get_bits(&a->gb, 5) << 3;
73 luma+= 4;
74 *(cb++) = get_bits(&a->gb, 6) << 2;
75 *(cr++) = get_bits(&a->gb, 6) << 2;
76 }
77 }
78
79 *picture= *(AVFrame*)&a->picture;
80 *data_size = sizeof(AVPicture);
81
82 emms_c();
83
84 return buf_size;
85 }
86
87 #if 0
88 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
89 CLJRContext * const a = avctx->priv_data;
90 AVFrame *pict = data;
91 AVFrame * const p= (AVFrame*)&a->picture;
92 int size;
93 int mb_x, mb_y;
94
95 *p = *pict;
96 p->pict_type= I_TYPE;
97 p->key_frame= 1;
98
99 emms_c();
100
101 align_put_bits(&a->pb);
102 while(get_bit_count(&a->pb)&31)
103 put_bits(&a->pb, 8, 0);
104
105 size= get_bit_count(&a->pb)/32;
106
107 return size*4;
108 }
109 #endif
110
111 static void common_init(AVCodecContext *avctx){
112 CLJRContext * const a = avctx->priv_data;
113
114 avctx->coded_frame= (AVFrame*)&a->picture;
115 a->avctx= avctx;
116 }
117
118 static int decode_init(AVCodecContext *avctx){
119
120 common_init(avctx);
121
122 avctx->pix_fmt= PIX_FMT_YUV411P;
123
124 return 0;
125 }
126
127 static int encode_init(AVCodecContext *avctx){
128
129 common_init(avctx);
130
131 return 0;
132 }
133
134 AVCodec cljr_decoder = {
135 "cljr",
136 CODEC_TYPE_VIDEO,
137 CODEC_ID_CLJR,
138 sizeof(CLJRContext),
139 decode_init,
140 NULL,
141 NULL,
142 decode_frame,
143 CODEC_CAP_DR1,
144 };
145 #if 0
146 #ifdef CONFIG_ENCODERS
147
148 AVCodec cljr_encoder = {
149 "cljr",
150 CODEC_TYPE_VIDEO,
151 CODEC_ID_cljr,
152 sizeof(CLJRContext),
153 encode_init,
154 encode_frame,
155 //encode_end,
156 };
157
158 #endif //CONFIG_ENCODERS
159 #endif