8def82e4b63b0ced9a6a6d232211d82b14b12f7f
[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 libavcodec/cljr.c
24 * Cirrus Logic AccuPak codec.
25 */
26
27 #include "avcodec.h"
28 #include "dsputil.h"
29 #include "bitstream.h"
30
31 /* Disable the encoder. */
32 #undef CONFIG_CLJR_ENCODER
33 #define CONFIG_CLJR_ENCODER 0
34
35 typedef struct CLJRContext{
36 AVCodecContext *avctx;
37 AVFrame picture;
38 int delta[16];
39 int offset[4];
40 GetBitContext gb;
41 } CLJRContext;
42
43 static int decode_frame(AVCodecContext *avctx,
44 void *data, int *data_size,
45 const uint8_t *buf, int buf_size)
46 {
47 CLJRContext * const a = avctx->priv_data;
48 AVFrame *picture = data;
49 AVFrame * const p= (AVFrame*)&a->picture;
50 int x, y;
51
52 if(p->data[0])
53 avctx->release_buffer(avctx, p);
54
55 p->reference= 0;
56 if(avctx->get_buffer(avctx, p) < 0){
57 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
58 return -1;
59 }
60 p->pict_type= FF_I_TYPE;
61 p->key_frame= 1;
62
63 init_get_bits(&a->gb, buf, buf_size);
64
65 for(y=0; y<avctx->height; y++){
66 uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
67 uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
68 uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
69 for(x=0; x<avctx->width; x+=4){
70 luma[3] = get_bits(&a->gb, 5) << 3;
71 luma[2] = get_bits(&a->gb, 5) << 3;
72 luma[1] = get_bits(&a->gb, 5) << 3;
73 luma[0] = get_bits(&a->gb, 5) << 3;
74 luma+= 4;
75 *(cb++) = get_bits(&a->gb, 6) << 2;
76 *(cr++) = get_bits(&a->gb, 6) << 2;
77 }
78 }
79
80 *picture= *(AVFrame*)&a->picture;
81 *data_size = sizeof(AVPicture);
82
83 emms_c();
84
85 return buf_size;
86 }
87
88 #if CONFIG_CLJR_ENCODER
89 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
90 CLJRContext * const a = avctx->priv_data;
91 AVFrame *pict = data;
92 AVFrame * const p= (AVFrame*)&a->picture;
93 int size;
94 int mb_x, mb_y;
95
96 *p = *pict;
97 p->pict_type= FF_I_TYPE;
98 p->key_frame= 1;
99
100 emms_c();
101
102 align_put_bits(&a->pb);
103 while(get_bit_count(&a->pb)&31)
104 put_bits(&a->pb, 8, 0);
105
106 size= get_bit_count(&a->pb)/32;
107
108 return size*4;
109 }
110 #endif
111
112 static av_cold void common_init(AVCodecContext *avctx){
113 CLJRContext * const a = avctx->priv_data;
114
115 avctx->coded_frame= (AVFrame*)&a->picture;
116 a->avctx= avctx;
117 }
118
119 static av_cold int decode_init(AVCodecContext *avctx){
120
121 common_init(avctx);
122
123 avctx->pix_fmt= PIX_FMT_YUV411P;
124
125 return 0;
126 }
127
128 #if CONFIG_CLJR_ENCODER
129 static av_cold int encode_init(AVCodecContext *avctx){
130
131 common_init(avctx);
132
133 return 0;
134 }
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
150 #if 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