lavc: use designated initialisers for all codecs.
[libav.git] / libavcodec / xl.c
1 /*
2 * Miro VideoXL codec
3 * Copyright (c) 2004 Konstantin Shishkov
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 * Miro VideoXL codec.
25 */
26
27 #include "libavutil/intreadwrite.h"
28 #include "avcodec.h"
29
30 typedef struct VideoXLContext{
31 AVCodecContext *avctx;
32 AVFrame pic;
33 } VideoXLContext;
34
35 static const int xl_table[32] = {
36 0, 1, 2, 3, 4, 5, 6, 7,
37 8, 9, 12, 15, 20, 25, 34, 46,
38 64, 82, 94, 103, 108, 113, 116, 119,
39 120, 121, 122, 123, 124, 125, 126, 127};
40
41 static int decode_frame(AVCodecContext *avctx,
42 void *data, int *data_size,
43 AVPacket *avpkt)
44 {
45 const uint8_t *buf = avpkt->data;
46 int buf_size = avpkt->size;
47 VideoXLContext * const a = avctx->priv_data;
48 AVFrame * const p= (AVFrame*)&a->pic;
49 uint8_t *Y, *U, *V;
50 int i, j;
51 int stride;
52 uint32_t val;
53 int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0;
54
55 if(p->data[0])
56 avctx->release_buffer(avctx, p);
57
58 p->reference = 0;
59 if(avctx->get_buffer(avctx, p) < 0){
60 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
61 return -1;
62 }
63 p->pict_type= AV_PICTURE_TYPE_I;
64 p->key_frame= 1;
65
66 Y = a->pic.data[0];
67 U = a->pic.data[1];
68 V = a->pic.data[2];
69
70 stride = avctx->width - 4;
71 for (i = 0; i < avctx->height; i++) {
72 /* lines are stored in reversed order */
73 buf += stride;
74
75 for (j = 0; j < avctx->width; j += 4) {
76 /* value is stored in LE dword with word swapped */
77 val = AV_RL32(buf);
78 buf -= 4;
79 val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16);
80
81 if(!j)
82 y0 = (val & 0x1F) << 2;
83 else
84 y0 = y3 + xl_table[val & 0x1F];
85 val >>= 5;
86 y1 = y0 + xl_table[val & 0x1F];
87 val >>= 5;
88 y2 = y1 + xl_table[val & 0x1F];
89 val >>= 6; /* align to word */
90 y3 = y2 + xl_table[val & 0x1F];
91 val >>= 5;
92 if(!j)
93 c0 = (val & 0x1F) << 2;
94 else
95 c0 += xl_table[val & 0x1F];
96 val >>= 5;
97 if(!j)
98 c1 = (val & 0x1F) << 2;
99 else
100 c1 += xl_table[val & 0x1F];
101
102 Y[j + 0] = y0 << 1;
103 Y[j + 1] = y1 << 1;
104 Y[j + 2] = y2 << 1;
105 Y[j + 3] = y3 << 1;
106
107 U[j >> 2] = c0 << 1;
108 V[j >> 2] = c1 << 1;
109 }
110
111 buf += avctx->width + 4;
112 Y += a->pic.linesize[0];
113 U += a->pic.linesize[1];
114 V += a->pic.linesize[2];
115 }
116
117 *data_size = sizeof(AVFrame);
118 *(AVFrame*)data = a->pic;
119
120 return buf_size;
121 }
122
123 static av_cold int decode_init(AVCodecContext *avctx){
124 // VideoXLContext * const a = avctx->priv_data;
125
126 avctx->pix_fmt= PIX_FMT_YUV411P;
127
128 return 0;
129 }
130
131 static av_cold int decode_end(AVCodecContext *avctx){
132 VideoXLContext * const a = avctx->priv_data;
133 AVFrame *pic = &a->pic;
134
135 if (pic->data[0])
136 avctx->release_buffer(avctx, pic);
137
138 return 0;
139 }
140
141 AVCodec ff_xl_decoder = {
142 .name = "xl",
143 .type = AVMEDIA_TYPE_VIDEO,
144 .id = CODEC_ID_VIXL,
145 .priv_data_size = sizeof(VideoXLContext),
146 .init = decode_init,
147 .close = decode_end,
148 .decode = decode_frame,
149 .capabilities = CODEC_CAP_DR1,
150 .long_name = NULL_IF_CONFIG_SMALL("Miro VideoXL"),
151 };