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1 | /* |
2 | * Miro VideoXL codec | |
3 | * Copyright (c) 2004 Konstantin Shishkov | |
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 | * Miro VideoXL codec. | |
25 | */ | |
26 | ||
27 | #include "libavutil/common.h" | |
28 | #include "libavutil/intreadwrite.h" | |
29 | #include "avcodec.h" | |
30 | #include "internal.h" | |
31 | ||
32 | static const int xl_table[32] = { | |
33 | 0, 1, 2, 3, 4, 5, 6, 7, | |
34 | 8, 9, 12, 15, 20, 25, 34, 46, | |
35 | 64, 82, 94, 103, 108, 113, 116, 119, | |
36 | 120, 121, 122, 123, 124, 125, 126, 127 | |
37 | }; | |
38 | ||
39 | static int decode_frame(AVCodecContext *avctx, | |
40 | void *data, int *got_frame, | |
41 | AVPacket *avpkt) | |
42 | { | |
43 | const uint8_t *buf = avpkt->data; | |
44 | int buf_size = avpkt->size; | |
45 | AVFrame *const p = data; | |
46 | uint8_t *Y, *U, *V; | |
47 | int i, j, ret; | |
48 | int stride; | |
49 | uint32_t val; | |
50 | int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0; | |
51 | ||
52 | if (avctx->width % 4) { | |
53 | av_log(avctx, AV_LOG_ERROR, "width is not a multiple of 4\n"); | |
54 | return AVERROR_INVALIDDATA; | |
55 | } | |
56 | if (buf_size < avctx->width * avctx->height) { | |
57 | av_log(avctx, AV_LOG_ERROR, "Packet is too small\n"); | |
58 | return AVERROR_INVALIDDATA; | |
59 | } | |
60 | ||
61 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) | |
62 | return ret; | |
63 | p->pict_type = AV_PICTURE_TYPE_I; | |
64 | p->key_frame = 1; | |
65 | ||
66 | Y = p->data[0]; | |
67 | U = p->data[1]; | |
68 | V = p->data[2]; | |
69 | ||
70 | stride = avctx->width - 4; | |
71 | ||
72 | for (i = 0; i < avctx->height; i++) { | |
73 | /* lines are stored in reversed order */ | |
74 | buf += stride; | |
75 | ||
76 | for (j = 0; j < avctx->width; j += 4) { | |
77 | /* value is stored in LE dword with word swapped */ | |
78 | val = AV_RL32(buf); | |
79 | buf -= 4; | |
80 | val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16); | |
81 | ||
82 | if (!j) | |
83 | y0 = (val & 0x1F) << 2; | |
84 | else | |
85 | y0 = y3 + xl_table[val & 0x1F]; | |
86 | val >>= 5; | |
87 | y1 = y0 + xl_table[val & 0x1F]; | |
88 | val >>= 5; | |
89 | y2 = y1 + xl_table[val & 0x1F]; | |
90 | val >>= 6; /* align to word */ | |
91 | y3 = y2 + xl_table[val & 0x1F]; | |
92 | val >>= 5; | |
93 | if (!j) | |
94 | c0 = (val & 0x1F) << 2; | |
95 | else | |
96 | c0 += xl_table[val & 0x1F]; | |
97 | val >>= 5; | |
98 | if (!j) | |
99 | c1 = (val & 0x1F) << 2; | |
100 | else | |
101 | c1 += xl_table[val & 0x1F]; | |
102 | ||
103 | Y[j + 0] = y0 << 1; | |
104 | Y[j + 1] = y1 << 1; | |
105 | Y[j + 2] = y2 << 1; | |
106 | Y[j + 3] = y3 << 1; | |
107 | ||
108 | U[j >> 2] = c0 << 1; | |
109 | V[j >> 2] = c1 << 1; | |
110 | } | |
111 | ||
112 | buf += avctx->width + 4; | |
113 | Y += p->linesize[0]; | |
114 | U += p->linesize[1]; | |
115 | V += p->linesize[2]; | |
116 | } | |
117 | ||
118 | *got_frame = 1; | |
119 | ||
120 | return buf_size; | |
121 | } | |
122 | ||
123 | static av_cold int decode_init(AVCodecContext *avctx) | |
124 | { | |
125 | avctx->pix_fmt = AV_PIX_FMT_YUV411P; | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | AVCodec ff_xl_decoder = { | |
131 | .name = "xl", | |
132 | .long_name = NULL_IF_CONFIG_SMALL("Miro VideoXL"), | |
133 | .type = AVMEDIA_TYPE_VIDEO, | |
134 | .id = AV_CODEC_ID_VIXL, | |
135 | .init = decode_init, | |
136 | .decode = decode_frame, | |
137 | .capabilities = CODEC_CAP_DR1, | |
138 | }; |