Disable encoders by undefining CONFIG_FOO_ENCODER once instead of littering
[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 /* Disable the encoder. */
32 #undef CONFIG_CLJR_ENCODER
33
34 typedef struct CLJRContext{
35 AVCodecContext *avctx;
36 AVFrame picture;
37 int delta[16];
38 int offset[4];
39 GetBitContext gb;
40 } CLJRContext;
41
42 static int decode_frame(AVCodecContext *avctx,
43 void *data, int *data_size,
44 const uint8_t *buf, int buf_size)
45 {
46 CLJRContext * const a = avctx->priv_data;
47 AVFrame *picture = data;
48 AVFrame * const p= (AVFrame*)&a->picture;
49 int x, y;
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= FF_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 #ifdef CONFIG_CLJR_ENCODER
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= FF_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 av_cold 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 av_cold 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 #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
136 AVCodec cljr_decoder = {
137 "cljr",
138 CODEC_TYPE_VIDEO,
139 CODEC_ID_CLJR,
140 sizeof(CLJRContext),
141 decode_init,
142 NULL,
143 NULL,
144 decode_frame,
145 CODEC_CAP_DR1,
146 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
147 };
148
149 #ifdef CONFIG_CLJR_ENCODER
150 AVCodec cljr_encoder = {
151 "cljr",
152 CODEC_TYPE_VIDEO,
153 CODEC_ID_cljr,
154 sizeof(CLJRContext),
155 encode_init,
156 encode_frame,
157 //encode_end,
158 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
159 };
160 #endif