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1 | /* |
2 | * Copyright (c) 1990 James Ashton - Sydney University | |
3 | * Copyright (c) 2012 Stefano Sabatini | |
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 | * X-Face decoder, based on libcompface, by James Ashton. | |
25 | */ | |
26 | ||
27 | #include "libavutil/pixdesc.h" | |
28 | #include "avcodec.h" | |
29 | #include "bytestream.h" | |
30 | #include "internal.h" | |
31 | #include "xface.h" | |
32 | ||
33 | static int pop_integer(BigInt *b, const ProbRange *pranges) | |
34 | { | |
35 | uint8_t r; | |
36 | int i; | |
37 | ||
38 | /* extract the last byte into r, and shift right b by 8 bits */ | |
39 | ff_big_div(b, 0, &r); | |
40 | ||
41 | i = 0; | |
42 | while (r < pranges->offset || r >= pranges->range + pranges->offset) { | |
43 | pranges++; | |
44 | i++; | |
45 | } | |
46 | ff_big_mul(b, pranges->range); | |
47 | ff_big_add(b, r - pranges->offset); | |
48 | return i; | |
49 | } | |
50 | ||
51 | static void pop_greys(BigInt *b, char *bitmap, int w, int h) | |
52 | { | |
53 | if (w > 3) { | |
54 | w /= 2; | |
55 | h /= 2; | |
56 | pop_greys(b, bitmap, w, h); | |
57 | pop_greys(b, bitmap + w, w, h); | |
58 | pop_greys(b, bitmap + XFACE_WIDTH * h, w, h); | |
59 | pop_greys(b, bitmap + XFACE_WIDTH * h + w, w, h); | |
60 | } else { | |
61 | w = pop_integer(b, ff_xface_probranges_2x2); | |
62 | if (w & 1) bitmap[0] = 1; | |
63 | if (w & 2) bitmap[1] = 1; | |
64 | if (w & 4) bitmap[XFACE_WIDTH] = 1; | |
65 | if (w & 8) bitmap[XFACE_WIDTH + 1] = 1; | |
66 | } | |
67 | } | |
68 | ||
69 | static void decode_block(BigInt *b, char *bitmap, int w, int h, int level) | |
70 | { | |
71 | switch (pop_integer(b, &ff_xface_probranges_per_level[level][0])) { | |
72 | case XFACE_COLOR_WHITE: | |
73 | return; | |
74 | case XFACE_COLOR_BLACK: | |
75 | pop_greys(b, bitmap, w, h); | |
76 | return; | |
77 | default: | |
78 | w /= 2; | |
79 | h /= 2; | |
80 | level++; | |
81 | decode_block(b, bitmap, w, h, level); | |
82 | decode_block(b, bitmap + w, w, h, level); | |
83 | decode_block(b, bitmap + h * XFACE_WIDTH, w, h, level); | |
84 | decode_block(b, bitmap + w + h * XFACE_WIDTH, w, h, level); | |
85 | return; | |
86 | } | |
87 | } | |
88 | ||
89 | typedef struct XFaceContext { | |
90 | uint8_t bitmap[XFACE_PIXELS]; ///< image used internally for decoding | |
91 | } XFaceContext; | |
92 | ||
93 | static av_cold int xface_decode_init(AVCodecContext *avctx) | |
94 | { | |
95 | if (avctx->width || avctx->height) { | |
96 | if (avctx->width != XFACE_WIDTH || avctx->height != XFACE_HEIGHT) { | |
97 | av_log(avctx, AV_LOG_ERROR, | |
98 | "Size value %dx%d not supported, only accepts a size of %dx%d\n", | |
99 | avctx->width, avctx->height, XFACE_WIDTH, XFACE_HEIGHT); | |
100 | return AVERROR(EINVAL); | |
101 | } | |
102 | } | |
103 | ||
104 | avctx->width = XFACE_WIDTH; | |
105 | avctx->height = XFACE_HEIGHT; | |
106 | avctx->pix_fmt = AV_PIX_FMT_MONOWHITE; | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static int xface_decode_frame(AVCodecContext *avctx, | |
112 | void *data, int *got_frame, | |
113 | AVPacket *avpkt) | |
114 | { | |
115 | XFaceContext *xface = avctx->priv_data; | |
116 | int ret, i, j, k; | |
117 | uint8_t byte; | |
118 | BigInt b = {0}; | |
119 | char *buf; | |
120 | int64_t c; | |
121 | AVFrame *frame = data; | |
122 | ||
123 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
124 | return ret; | |
125 | ||
126 | for (i = 0, k = 0; avpkt->data[i] && i < avpkt->size; i++) { | |
127 | c = avpkt->data[i]; | |
128 | ||
129 | /* ignore invalid digits */ | |
130 | if (c < XFACE_FIRST_PRINT || c > XFACE_LAST_PRINT) | |
131 | continue; | |
132 | ||
133 | if (++k > XFACE_MAX_DIGITS) { | |
134 | av_log(avctx, AV_LOG_WARNING, | |
135 | "Buffer is longer than expected, truncating at byte %d\n", i); | |
136 | break; | |
137 | } | |
138 | ff_big_mul(&b, XFACE_PRINTS); | |
139 | ff_big_add(&b, c - XFACE_FIRST_PRINT); | |
140 | } | |
141 | ||
142 | /* decode image and put it in bitmap */ | |
143 | memset(xface->bitmap, 0, XFACE_PIXELS); | |
144 | buf = xface->bitmap; | |
145 | decode_block(&b, buf, 16, 16, 0); | |
146 | decode_block(&b, buf + 16, 16, 16, 0); | |
147 | decode_block(&b, buf + 32, 16, 16, 0); | |
148 | decode_block(&b, buf + XFACE_WIDTH * 16, 16, 16, 0); | |
149 | decode_block(&b, buf + XFACE_WIDTH * 16 + 16, 16, 16, 0); | |
150 | decode_block(&b, buf + XFACE_WIDTH * 16 + 32, 16, 16, 0); | |
151 | decode_block(&b, buf + XFACE_WIDTH * 32 , 16, 16, 0); | |
152 | decode_block(&b, buf + XFACE_WIDTH * 32 + 16, 16, 16, 0); | |
153 | decode_block(&b, buf + XFACE_WIDTH * 32 + 32, 16, 16, 0); | |
154 | ||
155 | ff_xface_generate_face(xface->bitmap, xface->bitmap); | |
156 | ||
157 | /* convert image from 1=black 0=white bitmap to MONOWHITE */ | |
158 | buf = frame->data[0]; | |
159 | for (i = 0, j = 0, k = 0, byte = 0; i < XFACE_PIXELS; i++) { | |
160 | byte += xface->bitmap[i]; | |
161 | if (k == 7) { | |
162 | buf[j++] = byte; | |
163 | byte = k = 0; | |
164 | } else { | |
165 | k++; | |
166 | byte <<= 1; | |
167 | } | |
168 | if (j == XFACE_WIDTH/8) { | |
169 | j = 0; | |
170 | buf += frame->linesize[0]; | |
171 | } | |
172 | } | |
173 | ||
174 | *got_frame = 1; | |
175 | ||
176 | return avpkt->size; | |
177 | } | |
178 | ||
179 | AVCodec ff_xface_decoder = { | |
180 | .name = "xface", | |
181 | .long_name = NULL_IF_CONFIG_SMALL("X-face image"), | |
182 | .type = AVMEDIA_TYPE_VIDEO, | |
183 | .id = AV_CODEC_ID_XFACE, | |
184 | .priv_data_size = sizeof(XFaceContext), | |
185 | .init = xface_decode_init, | |
186 | .decode = xface_decode_frame, | |
187 | .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_MONOWHITE, AV_PIX_FMT_NONE }, | |
188 | }; |