cljr: K&R cosmetics
[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,
64 "Resolution larger than buffer size. Invalid header?\n");
65 return AVERROR_INVALIDDATA;
66 }
67
68 p->reference = 0;
69 if (avctx->get_buffer(avctx, p) < 0) {
70 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
71 return -1;
72 }
73 p->pict_type = AV_PICTURE_TYPE_I;
74 p->key_frame = 1;
75
76 init_get_bits(&gb, buf, buf_size * 8);
77
78 for (y = 0; y < avctx->height; y++) {
79 uint8_t *luma = &a->picture.data[0][y * a->picture.linesize[0]];
80 uint8_t *cb = &a->picture.data[1][y * a->picture.linesize[1]];
81 uint8_t *cr = &a->picture.data[2][y * a->picture.linesize[2]];
82 for (x = 0; x < avctx->width; x += 4) {
83 luma[3] = get_bits(&gb, 5) << 3;
84 luma[2] = get_bits(&gb, 5) << 3;
85 luma[1] = get_bits(&gb, 5) << 3;
86 luma[0] = get_bits(&gb, 5) << 3;
87 luma += 4;
88 *(cb++) = get_bits(&gb, 6) << 2;
89 *(cr++) = get_bits(&gb, 6) << 2;
90 }
91 }
92
93 *picture = a->picture;
94 *data_size = sizeof(AVPicture);
95
96 return buf_size;
97 }
98
99 static av_cold int decode_init(AVCodecContext *avctx)
100 {
101 avctx->pix_fmt = PIX_FMT_YUV411P;
102 return common_init(avctx);
103 }
104
105 static av_cold int decode_end(AVCodecContext *avctx)
106 {
107 CLJRContext *a = avctx->priv_data;
108
109 if (a->picture.data[0])
110 avctx->release_buffer(avctx, &a->picture);
111 return 0;
112 }
113
114 AVCodec ff_cljr_decoder = {
115 .name = "cljr",
116 .type = AVMEDIA_TYPE_VIDEO,
117 .id = CODEC_ID_CLJR,
118 .priv_data_size = sizeof(CLJRContext),
119 .init = decode_init,
120 .close = decode_end,
121 .decode = decode_frame,
122 .capabilities = CODEC_CAP_DR1,
123 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
124 };
125 #endif
126
127 #if CONFIG_CLJR_ENCODER
128 static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
129 int buf_size, void *data)
130 {
131 PutBitContext pb;
132 AVFrame *p = data;
133 int x, y;
134
135 p->pict_type = AV_PICTURE_TYPE_I;
136 p->key_frame = 1;
137
138 init_put_bits(&pb, buf, buf_size / 8);
139
140 for (y = 0; y < avctx->height; y++) {
141 uint8_t *luma = &p->data[0][y * p->linesize[0]];
142 uint8_t *cb = &p->data[1][y * p->linesize[1]];
143 uint8_t *cr = &p->data[2][y * p->linesize[2]];
144 for (x = 0; x < avctx->width; x += 4) {
145 put_bits(&pb, 5, luma[3] >> 3);
146 put_bits(&pb, 5, luma[2] >> 3);
147 put_bits(&pb, 5, luma[1] >> 3);
148 put_bits(&pb, 5, luma[0] >> 3);
149 luma += 4;
150 put_bits(&pb, 6, *(cb++) >> 2);
151 put_bits(&pb, 6, *(cr++) >> 2);
152 }
153 }
154
155 flush_put_bits(&pb);
156
157 return put_bits_count(&pb) / 8;
158 }
159
160 AVCodec ff_cljr_encoder = {
161 .name = "cljr",
162 .type = AVMEDIA_TYPE_VIDEO,
163 .id = CODEC_ID_CLJR,
164 .priv_data_size = sizeof(CLJRContext),
165 .init = common_init,
166 .encode = encode_frame,
167 .pix_fmts = (const enum PixelFormat[]) { PIX_FMT_YUV411P,
168 PIX_FMT_NONE },
169 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
170 };
171 #endif