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[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 Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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
24 * Cirrus Logic AccuPak codec.
25 */
26
27 #include "avcodec.h"
28 #include "dsputil.h"
29 #include "get_bits.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 } CLJRContext;
39
40 static int decode_frame(AVCodecContext *avctx,
41 void *data, int *data_size,
42 AVPacket *avpkt)
43 {
44 const uint8_t *buf = avpkt->data;
45 int buf_size = avpkt->size;
46 CLJRContext * const a = avctx->priv_data;
47 GetBitContext gb;
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 if(buf_size/avctx->height < avctx->width) {
56 av_log(avctx, AV_LOG_ERROR, "Resolution larger than buffer size. Invalid header?\n");
57 return -1;
58 }
59
60 p->reference= 0;
61 if(avctx->get_buffer(avctx, p) < 0){
62 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
63 return -1;
64 }
65 p->pict_type= AV_PICTURE_TYPE_I;
66 p->key_frame= 1;
67
68 init_get_bits(&gb, buf, buf_size * 8);
69
70 for(y=0; y<avctx->height; y++){
71 uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
72 uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
73 uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
74 for(x=0; x<avctx->width; x+=4){
75 luma[3] = get_bits(&gb, 5) << 3;
76 luma[2] = get_bits(&gb, 5) << 3;
77 luma[1] = get_bits(&gb, 5) << 3;
78 luma[0] = get_bits(&gb, 5) << 3;
79 luma+= 4;
80 *(cb++) = get_bits(&gb, 6) << 2;
81 *(cr++) = get_bits(&gb, 6) << 2;
82 }
83 }
84
85 *picture= *(AVFrame*)&a->picture;
86 *data_size = sizeof(AVPicture);
87
88 emms_c();
89
90 return buf_size;
91 }
92
93 #if CONFIG_CLJR_ENCODER
94 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
95 CLJRContext * const a = avctx->priv_data;
96 AVFrame *pict = data;
97 AVFrame * const p= (AVFrame*)&a->picture;
98 int size;
99
100 *p = *pict;
101 p->pict_type= AV_PICTURE_TYPE_I;
102 p->key_frame= 1;
103
104 emms_c();
105
106 avpriv_align_put_bits(&a->pb);
107 while(get_bit_count(&a->pb)&31)
108 put_bits(&a->pb, 8, 0);
109
110 size= get_bit_count(&a->pb)/32;
111
112 return size*4;
113 }
114 #endif
115
116 static av_cold void common_init(AVCodecContext *avctx){
117 CLJRContext * const a = avctx->priv_data;
118
119 avctx->coded_frame= (AVFrame*)&a->picture;
120 a->avctx= avctx;
121 }
122
123 static av_cold int decode_init(AVCodecContext *avctx){
124
125 common_init(avctx);
126
127 avctx->pix_fmt= PIX_FMT_YUV411P;
128
129 return 0;
130 }
131
132 static av_cold int decode_end(AVCodecContext *avctx) {
133 CLJRContext *a = avctx->priv_data;
134
135 if (a->picture.data[0]);
136 avctx->release_buffer(avctx, &a->picture);
137 }
138
139 #if CONFIG_CLJR_ENCODER
140 static av_cold int encode_init(AVCodecContext *avctx){
141
142 common_init(avctx);
143
144 return 0;
145 }
146 #endif
147
148 AVCodec ff_cljr_decoder = {
149 .name = "cljr",
150 .type = AVMEDIA_TYPE_VIDEO,
151 .id = CODEC_ID_CLJR,
152 .priv_data_size = sizeof(CLJRContext),
153 .init = decode_init,
154 .close = decode_end,
155 .decode = decode_frame,
156 .capabilities = CODEC_CAP_DR1,
157 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
158 };
159
160 #if CONFIG_CLJR_ENCODER
161 AVCodec ff_cljr_encoder = {
162 .name = "cljr",
163 .type = AVMEDIA_TYPE_VIDEO,
164 .id = CODEC_ID_CLJR,
165 .priv_data_size = sizeof(CLJRContext),
166 .init = encode_init,
167 .encode = encode_frame,
168 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
169 };
170 #endif