187e86d70df81888b70be657753e888d97670f4d
[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 "get_bits.h"
29 #include "put_bits.h"
30
31 typedef struct CLJRContext{
32 AVCodecContext *avctx;
33 AVFrame picture;
34 } CLJRContext;
35
36 static av_cold int common_init(AVCodecContext *avctx)
37 {
38 CLJRContext * const a = avctx->priv_data;
39
40 avctx->coded_frame = &a->picture;
41 a->avctx = avctx;
42
43 return 0;
44 }
45
46 #if CONFIG_CLJR_DECODER
47 static int decode_frame(AVCodecContext *avctx,
48 void *data, int *data_size,
49 AVPacket *avpkt)
50 {
51 const uint8_t *buf = avpkt->data;
52 int buf_size = avpkt->size;
53 CLJRContext * const a = avctx->priv_data;
54 GetBitContext gb;
55 AVFrame *picture = data;
56 AVFrame * const p = &a->picture;
57 int x, y;
58
59 if(p->data[0])
60 avctx->release_buffer(avctx, p);
61
62 if(buf_size/avctx->height < avctx->width) {
63 av_log(avctx, AV_LOG_ERROR, "Resolution larger than buffer size. Invalid header?\n");
64 return AVERROR_INVALIDDATA;
65 }
66
67 p->reference= 0;
68 if(avctx->get_buffer(avctx, p) < 0){
69 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
70 return -1;
71 }
72 p->pict_type= AV_PICTURE_TYPE_I;
73 p->key_frame= 1;
74
75 init_get_bits(&gb, buf, buf_size * 8);
76
77 for(y=0; y<avctx->height; y++){
78 uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
79 uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
80 uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
81 for(x=0; x<avctx->width; x+=4){
82 luma[3] = get_bits(&gb, 5) << 3;
83 luma[2] = get_bits(&gb, 5) << 3;
84 luma[1] = get_bits(&gb, 5) << 3;
85 luma[0] = get_bits(&gb, 5) << 3;
86 luma+= 4;
87 *(cb++) = get_bits(&gb, 6) << 2;
88 *(cr++) = get_bits(&gb, 6) << 2;
89 }
90 }
91
92 *picture = a->picture;
93 *data_size = sizeof(AVPicture);
94
95 return buf_size;
96 }
97
98 static av_cold int decode_init(AVCodecContext *avctx)
99 {
100 avctx->pix_fmt = PIX_FMT_YUV411P;
101 return common_init(avctx);
102 }
103
104 static av_cold int decode_end(AVCodecContext *avctx)
105 {
106 CLJRContext *a = avctx->priv_data;
107
108 if (a->picture.data[0])
109 avctx->release_buffer(avctx, &a->picture);
110 return 0;
111 }
112
113 AVCodec ff_cljr_decoder = {
114 .name = "cljr",
115 .type = AVMEDIA_TYPE_VIDEO,
116 .id = CODEC_ID_CLJR,
117 .priv_data_size = sizeof(CLJRContext),
118 .init = decode_init,
119 .close = decode_end,
120 .decode = decode_frame,
121 .capabilities = CODEC_CAP_DR1,
122 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
123 };
124 #endif
125
126 #if CONFIG_CLJR_ENCODER
127 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
128 PutBitContext pb;
129 AVFrame *p = data;
130 int x, y;
131
132 p->pict_type= AV_PICTURE_TYPE_I;
133 p->key_frame= 1;
134
135 init_put_bits(&pb, buf, buf_size / 8);
136
137 for (y = 0; y < avctx->height; y++) {
138 uint8_t *luma = &p->data[0][y * p->linesize[0]];
139 uint8_t *cb = &p->data[1][y * p->linesize[1]];
140 uint8_t *cr = &p->data[2][y * p->linesize[2]];
141 for (x = 0; x < avctx->width; x += 4) {
142 put_bits(&pb, 5, luma[3] >> 3);
143 put_bits(&pb, 5, luma[2] >> 3);
144 put_bits(&pb, 5, luma[1] >> 3);
145 put_bits(&pb, 5, luma[0] >> 3);
146 luma += 4;
147 put_bits(&pb, 6, *(cb++) >> 2);
148 put_bits(&pb, 6, *(cr++) >> 2);
149 }
150 }
151
152 flush_put_bits(&pb);
153
154 return put_bits_count(&pb) / 8;
155 }
156
157 AVCodec ff_cljr_encoder = {
158 .name = "cljr",
159 .type = AVMEDIA_TYPE_VIDEO,
160 .id = CODEC_ID_CLJR,
161 .priv_data_size = sizeof(CLJRContext),
162 .init = common_init,
163 .encode = encode_frame,
164 .pix_fmts = (const enum PixelFormat[]) { PIX_FMT_YUV411P,
165 PIX_FMT_NONE },
166 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
167 };
168 #endif