1/*
2 * Cirrus Logic AccuPak (CLJR) codec
3 * Copyright (c) 2003 Alex Beregszaszi
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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
35typedef struct CLJRContext{
36    AVCodecContext *avctx;
37    AVFrame picture;
38    int delta[16];
39    int offset[4];
40    GetBitContext gb;
41} CLJRContext;
42
43static int decode_frame(AVCodecContext *avctx,
44                        void *data, int *data_size,
45                        AVPacket *avpkt)
46{
47    const uint8_t *buf = avpkt->data;
48    int buf_size = avpkt->size;
49    CLJRContext * const a = avctx->priv_data;
50    AVFrame *picture = data;
51    AVFrame * const p= (AVFrame*)&a->picture;
52    int x, y;
53
54    if(p->data[0])
55        avctx->release_buffer(avctx, p);
56
57    p->reference= 0;
58    if(avctx->get_buffer(avctx, p) < 0){
59        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
60        return -1;
61    }
62    p->pict_type= FF_I_TYPE;
63    p->key_frame= 1;
64
65    init_get_bits(&a->gb, buf, buf_size);
66
67    for(y=0; y<avctx->height; y++){
68        uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
69        uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
70        uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
71        for(x=0; x<avctx->width; x+=4){
72                luma[3] = get_bits(&a->gb, 5) << 3;
73            luma[2] = get_bits(&a->gb, 5) << 3;
74            luma[1] = get_bits(&a->gb, 5) << 3;
75            luma[0] = get_bits(&a->gb, 5) << 3;
76            luma+= 4;
77            *(cb++) = get_bits(&a->gb, 6) << 2;
78            *(cr++) = get_bits(&a->gb, 6) << 2;
79        }
80    }
81
82    *picture= *(AVFrame*)&a->picture;
83    *data_size = sizeof(AVPicture);
84
85    emms_c();
86
87    return buf_size;
88}
89
90#if CONFIG_CLJR_ENCODER
91static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
92    CLJRContext * const a = avctx->priv_data;
93    AVFrame *pict = data;
94    AVFrame * const p= (AVFrame*)&a->picture;
95    int size;
96
97    *p = *pict;
98    p->pict_type= FF_I_TYPE;
99    p->key_frame= 1;
100
101    emms_c();
102
103    align_put_bits(&a->pb);
104    while(get_bit_count(&a->pb)&31)
105        put_bits(&a->pb, 8, 0);
106
107    size= get_bit_count(&a->pb)/32;
108
109    return size*4;
110}
111#endif
112
113static av_cold void common_init(AVCodecContext *avctx){
114    CLJRContext * const a = avctx->priv_data;
115
116    avctx->coded_frame= (AVFrame*)&a->picture;
117    a->avctx= avctx;
118}
119
120static av_cold int decode_init(AVCodecContext *avctx){
121
122    common_init(avctx);
123
124    avctx->pix_fmt= PIX_FMT_YUV411P;
125
126    return 0;
127}
128
129#if CONFIG_CLJR_ENCODER
130static av_cold int encode_init(AVCodecContext *avctx){
131
132    common_init(avctx);
133
134    return 0;
135}
136#endif
137
138AVCodec cljr_decoder = {
139    "cljr",
140    AVMEDIA_TYPE_VIDEO,
141    CODEC_ID_CLJR,
142    sizeof(CLJRContext),
143    decode_init,
144    NULL,
145    NULL,
146    decode_frame,
147    CODEC_CAP_DR1,
148    .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
149};
150
151#if CONFIG_CLJR_ENCODER
152AVCodec cljr_encoder = {
153    "cljr",
154    AVMEDIA_TYPE_VIDEO,
155    CODEC_ID_CLJR,
156    sizeof(CLJRContext),
157    encode_init,
158    encode_frame,
159    //encode_end,
160    .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
161};
162#endif
163