FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/xfacedec.c
Date: 2024-04-19 17:50:32
Exec Total Coverage
Lines: 82 87 94.3%
Functions: 5 5 100.0%
Branches: 36 43 83.7%
Line Branch Exec Source
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 "avcodec.h"
28 #include "codec_internal.h"
29 #include "decode.h"
30 #include "xface.h"
31
32 194021 static int pop_integer(BigInt *b, const ProbRange *pranges)
33 {
34 uint8_t r;
35 int i;
36
37 /* extract the last byte into r, and shift right b by 8 bits */
38 194021 ff_big_div(b, 0, &r);
39
40 194021 i = 0;
41
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 776193 while (r < pranges->offset || r >= pranges->range + pranges->offset) {
42 582172 pranges++;
43 582172 i++;
44 }
45 194021 ff_big_mul(b, pranges->range);
46 194021 ff_big_add(b, r - pranges->offset);
47 194021 return i;
48 }
49
50 97901 static void pop_greys(BigInt *b, char *bitmap, int w, int h)
51 {
52
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 97901 if (w > 3) {
53 11033 w /= 2;
54 11033 h /= 2;
55 11033 pop_greys(b, bitmap, w, h);
56 11033 pop_greys(b, bitmap + w, w, h);
57 11033 pop_greys(b, bitmap + XFACE_WIDTH * h, w, h);
58 11033 pop_greys(b, bitmap + XFACE_WIDTH * h + w, w, h);
59 } else {
60 86868 w = pop_integer(b, ff_xface_probranges_2x2);
61
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 86868 if (w & 1) bitmap[0] = 1;
62
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 86868 if (w & 2) bitmap[1] = 1;
63
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 86868 if (w & 4) bitmap[XFACE_WIDTH] = 1;
64
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 86868 if (w & 8) bitmap[XFACE_WIDTH + 1] = 1;
65 }
66 97901 }
67
68 107153 static void decode_block(BigInt *b, char *bitmap, int w, int h, int level)
69 {
70
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 107153 switch (pop_integer(b, &ff_xface_probranges_per_level[level][0])) {
71 27048 case XFACE_COLOR_WHITE:
72 27048 return;
73 53769 case XFACE_COLOR_BLACK:
74 53769 pop_greys(b, bitmap, w, h);
75 53769 return;
76 26336 default:
77 26336 w /= 2;
78 26336 h /= 2;
79 26336 level++;
80 26336 decode_block(b, bitmap, w, h, level);
81 26336 decode_block(b, bitmap + w, w, h, level);
82 26336 decode_block(b, bitmap + h * XFACE_WIDTH, w, h, level);
83 26336 decode_block(b, bitmap + w + h * XFACE_WIDTH, w, h, level);
84 26336 return;
85 }
86 }
87
88 typedef struct XFaceContext {
89 uint8_t bitmap[XFACE_PIXELS]; ///< image used internally for decoding
90 } XFaceContext;
91
92 10 static av_cold int xface_decode_init(AVCodecContext *avctx)
93 {
94
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 10 if (avctx->width || avctx->height) {
95
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 9 if (avctx->width != XFACE_WIDTH || avctx->height != XFACE_HEIGHT) {
96 ✗ av_log(avctx, AV_LOG_ERROR,
97 "Size value %dx%d not supported, only accepts a size of %dx%d\n",
98 avctx->width, avctx->height, XFACE_WIDTH, XFACE_HEIGHT);
99 ✗ return AVERROR(EINVAL);
100 }
101 }
102
103 10 avctx->width = XFACE_WIDTH;
104 10 avctx->height = XFACE_HEIGHT;
105 10 avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
106
107 10 return 0;
108 }
109
110 201 static int xface_decode_frame(AVCodecContext *avctx, AVFrame *frame,
111 int *got_frame, AVPacket *avpkt)
112 {
113 201 XFaceContext *xface = avctx->priv_data;
114 int ret, i, j, k;
115 uint8_t byte;
116 201 BigInt b = {0};
117 char *buf;
118 int64_t c;
119
120
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 201 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
121 ✗ return ret;
122
123
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 68153 for (i = 0, k = 0; i < avpkt->size && avpkt->data[i]; i++) {
124 67952 c = avpkt->data[i];
125
126 /* ignore invalid digits */
127
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 67952 if (c < XFACE_FIRST_PRINT || c > XFACE_LAST_PRINT)
128 201 continue;
129
130
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 67751 if (++k > XFACE_MAX_DIGITS) {
131 ✗ av_log(avctx, AV_LOG_WARNING,
132 "Buffer is longer than expected, truncating at byte %d\n", i);
133 ✗ break;
134 }
135 67751 ff_big_mul(&b, XFACE_PRINTS);
136 67751 ff_big_add(&b, c - XFACE_FIRST_PRINT);
137 }
138
139 /* decode image and put it in bitmap */
140 201 memset(xface->bitmap, 0, XFACE_PIXELS);
141 201 buf = xface->bitmap;
142 201 decode_block(&b, buf, 16, 16, 0);
143 201 decode_block(&b, buf + 16, 16, 16, 0);
144 201 decode_block(&b, buf + 32, 16, 16, 0);
145 201 decode_block(&b, buf + XFACE_WIDTH * 16, 16, 16, 0);
146 201 decode_block(&b, buf + XFACE_WIDTH * 16 + 16, 16, 16, 0);
147 201 decode_block(&b, buf + XFACE_WIDTH * 16 + 32, 16, 16, 0);
148 201 decode_block(&b, buf + XFACE_WIDTH * 32 , 16, 16, 0);
149 201 decode_block(&b, buf + XFACE_WIDTH * 32 + 16, 16, 16, 0);
150 201 decode_block(&b, buf + XFACE_WIDTH * 32 + 32, 16, 16, 0);
151
152 201 ff_xface_generate_face(xface->bitmap, xface->bitmap);
153
154 /* convert image from 1=black 0=white bitmap to MONOWHITE */
155 201 buf = frame->data[0];
156
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 463305 for (i = 0, j = 0, k = 0, byte = 0; i < XFACE_PIXELS; i++) {
157 463104 byte += xface->bitmap[i];
158
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 463104 if (k == 7) {
159 57888 buf[j++] = byte;
160 57888 byte = k = 0;
161 } else {
162 405216 k++;
163 405216 byte <<= 1;
164 }
165
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 463104 if (j == XFACE_WIDTH/8) {
166 9648 j = 0;
167 9648 buf += frame->linesize[0];
168 }
169 }
170
171 201 *got_frame = 1;
172
173 201 return avpkt->size;
174 }
175
176 const FFCodec ff_xface_decoder = {
177 .p.name = "xface",
178 CODEC_LONG_NAME("X-face image"),
179 .p.type = AVMEDIA_TYPE_VIDEO,
180 .p.id = AV_CODEC_ID_XFACE,
181 .p.capabilities = AV_CODEC_CAP_DR1,
182 .priv_data_size = sizeof(XFaceContext),
183 .init = xface_decode_init,
184 FF_CODEC_DECODE_CB(xface_decode_frame),
185 };
186