cljr: add encoder
[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 int decode_frame(AVCodecContext *avctx,
37 void *data, int *data_size,
38 AVPacket *avpkt)
39 {
40 const uint8_t *buf = avpkt->data;
41 int buf_size = avpkt->size;
42 CLJRContext * const a = avctx->priv_data;
43 GetBitContext gb;
44 AVFrame *picture = data;
45 AVFrame * const p= (AVFrame*)&a->picture;
46 int x, y;
47
48 if(p->data[0])
49 avctx->release_buffer(avctx, p);
50
51 if(buf_size/avctx->height < avctx->width) {
52 av_log(avctx, AV_LOG_ERROR, "Resolution larger than buffer size. Invalid header?\n");
53 return -1;
54 }
55
56 p->reference= 0;
57 if(avctx->get_buffer(avctx, p) < 0){
58 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
59 return -1;
60 }
61 p->pict_type= AV_PICTURE_TYPE_I;
62 p->key_frame= 1;
63
64 init_get_bits(&gb, buf, buf_size * 8);
65
66 for(y=0; y<avctx->height; y++){
67 uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
68 uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
69 uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
70 for(x=0; x<avctx->width; x+=4){
71 luma[3] = get_bits(&gb, 5) << 3;
72 luma[2] = get_bits(&gb, 5) << 3;
73 luma[1] = get_bits(&gb, 5) << 3;
74 luma[0] = get_bits(&gb, 5) << 3;
75 luma+= 4;
76 *(cb++) = get_bits(&gb, 6) << 2;
77 *(cr++) = get_bits(&gb, 6) << 2;
78 }
79 }
80
81 *picture= *(AVFrame*)&a->picture;
82 *data_size = sizeof(AVPicture);
83
84 emms_c();
85
86 return buf_size;
87 }
88
89 #if CONFIG_CLJR_ENCODER
90 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
91 PutBitContext pb;
92 AVFrame *p = data;
93 int x, y;
94
95 p->pict_type= AV_PICTURE_TYPE_I;
96 p->key_frame= 1;
97
98 init_put_bits(&pb, buf, buf_size / 8);
99
100 for (y = 0; y < avctx->height; y++) {
101 uint8_t *luma = &p->data[0][y * p->linesize[0]];
102 uint8_t *cb = &p->data[1][y * p->linesize[1]];
103 uint8_t *cr = &p->data[2][y * p->linesize[2]];
104 for (x = 0; x < avctx->width; x += 4) {
105 put_bits(&pb, 5, luma[3] >> 3);
106 put_bits(&pb, 5, luma[2] >> 3);
107 put_bits(&pb, 5, luma[1] >> 3);
108 put_bits(&pb, 5, luma[0] >> 3);
109 luma += 4;
110 put_bits(&pb, 6, *(cb++) >> 2);
111 put_bits(&pb, 6, *(cr++) >> 2);
112 }
113 }
114
115 flush_put_bits(&pb);
116
117 emms_c();
118
119 return put_bits_count(&pb) / 8;
120 }
121 #endif
122
123 static av_cold void common_init(AVCodecContext *avctx){
124 CLJRContext * const a = avctx->priv_data;
125
126 avctx->coded_frame= (AVFrame*)&a->picture;
127 a->avctx= avctx;
128 }
129
130 static av_cold int decode_init(AVCodecContext *avctx){
131
132 common_init(avctx);
133
134 avctx->pix_fmt= PIX_FMT_YUV411P;
135
136 return 0;
137 }
138
139 static av_cold int decode_end(AVCodecContext *avctx) {
140 CLJRContext *a = avctx->priv_data;
141
142 if (a->picture.data[0]);
143 avctx->release_buffer(avctx, &a->picture);
144 }
145
146 #if CONFIG_CLJR_ENCODER
147 static av_cold int encode_init(AVCodecContext *avctx){
148
149 common_init(avctx);
150
151 return 0;
152 }
153 #endif
154
155 AVCodec ff_cljr_decoder = {
156 .name = "cljr",
157 .type = AVMEDIA_TYPE_VIDEO,
158 .id = CODEC_ID_CLJR,
159 .priv_data_size = sizeof(CLJRContext),
160 .init = decode_init,
161 .close = decode_end,
162 .decode = decode_frame,
163 .capabilities = CODEC_CAP_DR1,
164 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
165 };
166
167 #if CONFIG_CLJR_ENCODER
168 AVCodec ff_cljr_encoder = {
169 .name = "cljr",
170 .type = AVMEDIA_TYPE_VIDEO,
171 .id = CODEC_ID_CLJR,
172 .priv_data_size = sizeof(CLJRContext),
173 .init = encode_init,
174 .encode = encode_frame,
175 .pix_fmts = (const enum PixelFormat[]) { PIX_FMT_YUV411P,
176 PIX_FMT_NONE },
177 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
178 };
179 #endif