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