FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/bintext.c
Date: 2024-05-26 22:00:00
Exec Total Coverage
Lines: 0 114 0.0%
Functions: 0 4 0.0%
Branches: 0 70 0.0%

Line Branch Exec Source
1 /*
2 * Binary text decoder
3 * eXtended BINary text (XBIN) decoder
4 * iCEDraw File decoder
5 * Copyright (c) 2010 Peter Ross (pross@xvid.org)
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 /**
25 * @file
26 * Binary text decoder
27 * eXtended BINary text (XBIN) decoder
28 * iCEDraw File decoder
29 */
30
31 #include "config_components.h"
32
33 #include "libavutil/intreadwrite.h"
34 #include "libavutil/xga_font_data.h"
35 #include "avcodec.h"
36 #include "cga_data.h"
37 #include "bintext.h"
38 #include "codec_internal.h"
39 #include "decode.h"
40
41 #define FONT_WIDTH 8
42
43 typedef struct XbinContext {
44 AVFrame *frame;
45 int palette[16];
46 int flags;
47 int font_height;
48 const uint8_t *font;
49 int x, y;
50 } XbinContext;
51
52 static av_cold int decode_init(AVCodecContext *avctx)
53 {
54 XbinContext *s = avctx->priv_data;
55 uint8_t *p;
56 int i;
57
58 avctx->pix_fmt = AV_PIX_FMT_PAL8;
59 p = avctx->extradata;
60 if (p) {
61 s->font_height = p[0];
62 s->flags = p[1];
63 p += 2;
64 if(avctx->extradata_size < 2 + (!!(s->flags & BINTEXT_PALETTE))*3*16
65 + (!!(s->flags & BINTEXT_FONT))*s->font_height*256) {
66 av_log(avctx, AV_LOG_ERROR, "not enough extradata\n");
67 return AVERROR_INVALIDDATA;
68 }
69 if (!s->font_height) {
70 av_log(avctx, AV_LOG_ERROR, "invalid font height\n");
71 return AVERROR_INVALIDDATA;
72 }
73 } else {
74 s->font_height = 8;
75 s->flags = 0;
76 }
77
78 if ((s->flags & BINTEXT_PALETTE)) {
79 for (i = 0; i < 16; i++) {
80 s->palette[i] = 0xFF000000 | (AV_RB24(p) << 2) | ((AV_RB24(p) >> 4) & 0x30303);
81 p += 3;
82 }
83 } else {
84 for (i = 0; i < 16; i++)
85 s->palette[i] = 0xFF000000 | ff_cga_palette[i];
86 }
87
88 if ((s->flags & BINTEXT_FONT)) {
89 s->font = p;
90 } else {
91 switch(s->font_height) {
92 default:
93 av_log(avctx, AV_LOG_WARNING, "font height %i not supported\n", s->font_height);
94 s->font_height = 8;
95 case 8:
96 s->font = avpriv_cga_font;
97 break;
98 case 16:
99 s->font = avpriv_vga16_font;
100 break;
101 }
102 }
103 if (avctx->width < FONT_WIDTH || avctx->height < s->font_height) {
104 av_log(avctx, AV_LOG_ERROR, "Resolution too small for font.\n");
105 return AVERROR_INVALIDDATA;
106 }
107
108 return 0;
109 }
110
111 #define DEFAULT_BG_COLOR 0
112 av_unused static void hscroll(AVCodecContext *avctx)
113 {
114 XbinContext *s = avctx->priv_data;
115 if (s->y < avctx->height - s->font_height) {
116 s->y += s->font_height;
117 } else {
118 memmove(s->frame->data[0], s->frame->data[0] + s->font_height*s->frame->linesize[0],
119 (avctx->height - s->font_height)*s->frame->linesize[0]);
120 memset(s->frame->data[0] + (avctx->height - s->font_height)*s->frame->linesize[0],
121 DEFAULT_BG_COLOR, s->font_height * s->frame->linesize[0]);
122 }
123 }
124
125 /**
126 * Draw character to screen
127 */
128 static void draw_char(AVCodecContext *avctx, int c, int a)
129 {
130 XbinContext *s = avctx->priv_data;
131 if (s->y > avctx->height - s->font_height)
132 return;
133 ff_draw_pc_font(s->frame->data[0] + s->y * s->frame->linesize[0] + s->x,
134 s->frame->linesize[0], s->font, s->font_height, c,
135 a & 0x0F, a >> 4);
136 s->x += FONT_WIDTH;
137 if (s->x > avctx->width - FONT_WIDTH) {
138 s->x = 0;
139 s->y += s->font_height;
140 }
141 }
142
143 static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
144 int *got_frame, AVPacket *avpkt)
145 {
146 XbinContext *s = avctx->priv_data;
147 const uint8_t *buf = avpkt->data;
148 int buf_size = avpkt->size;
149 const uint8_t *buf_end = buf+buf_size;
150 int ret;
151
152 if ((avctx->width / FONT_WIDTH) * (avctx->height / s->font_height) / 256 > buf_size)
153 return AVERROR_INVALIDDATA;
154
155 s->frame = frame;
156 s->x = s->y = 0;
157 if ((ret = ff_get_buffer(avctx, s->frame, 0)) < 0)
158 return ret;
159 s->frame->pict_type = AV_PICTURE_TYPE_I;
160 #if FF_API_PALETTE_HAS_CHANGED
161 FF_DISABLE_DEPRECATION_WARNINGS
162 s->frame->palette_has_changed = 1;
163 FF_ENABLE_DEPRECATION_WARNINGS
164 #endif
165 memcpy(s->frame->data[1], s->palette, 16 * 4);
166
167 if (avctx->codec_id == AV_CODEC_ID_XBIN) {
168 while (buf + 2 < buf_end) {
169 int i,c,a;
170 int type = *buf >> 6;
171 int count = (*buf & 0x3F) + 1;
172 buf++;
173 switch (type) {
174 case 0: //no compression
175 for (i = 0; i < count && buf + 1 < buf_end; i++) {
176 draw_char(avctx, buf[0], buf[1]);
177 buf += 2;
178 }
179 break;
180 case 1: //character compression
181 c = *buf++;
182 for (i = 0; i < count && buf < buf_end; i++)
183 draw_char(avctx, c, *buf++);
184 break;
185 case 2: //attribute compression
186 a = *buf++;
187 for (i = 0; i < count && buf < buf_end; i++)
188 draw_char(avctx, *buf++, a);
189 break;
190 case 3: //character/attribute compression
191 c = *buf++;
192 a = *buf++;
193 for (i = 0; i < count && buf < buf_end; i++)
194 draw_char(avctx, c, a);
195 break;
196 }
197 }
198 } else if (avctx->codec_id == AV_CODEC_ID_IDF) {
199 while (buf + 2 < buf_end) {
200 if (AV_RL16(buf) == 1) {
201 int i;
202 if (buf + 6 > buf_end)
203 break;
204 for (i = 0; i < buf[2]; i++)
205 draw_char(avctx, buf[4], buf[5]);
206 buf += 6;
207 } else {
208 draw_char(avctx, buf[0], buf[1]);
209 buf += 2;
210 }
211 }
212 } else {
213 while (buf + 1 < buf_end) {
214 draw_char(avctx, buf[0], buf[1]);
215 buf += 2;
216 }
217 }
218
219 *got_frame = 1;
220 return buf_size;
221 }
222
223 #if CONFIG_BINTEXT_DECODER
224 const FFCodec ff_bintext_decoder = {
225 .p.name = "bintext",
226 CODEC_LONG_NAME("Binary text"),
227 .p.type = AVMEDIA_TYPE_VIDEO,
228 .p.id = AV_CODEC_ID_BINTEXT,
229 .priv_data_size = sizeof(XbinContext),
230 .init = decode_init,
231 FF_CODEC_DECODE_CB(decode_frame),
232 .p.capabilities = AV_CODEC_CAP_DR1,
233 };
234 #endif
235 #if CONFIG_XBIN_DECODER
236 const FFCodec ff_xbin_decoder = {
237 .p.name = "xbin",
238 CODEC_LONG_NAME("eXtended BINary text"),
239 .p.type = AVMEDIA_TYPE_VIDEO,
240 .p.id = AV_CODEC_ID_XBIN,
241 .priv_data_size = sizeof(XbinContext),
242 .init = decode_init,
243 FF_CODEC_DECODE_CB(decode_frame),
244 .p.capabilities = AV_CODEC_CAP_DR1,
245 };
246 #endif
247 #if CONFIG_IDF_DECODER
248 const FFCodec ff_idf_decoder = {
249 .p.name = "idf",
250 CODEC_LONG_NAME("iCEDraw text"),
251 .p.type = AVMEDIA_TYPE_VIDEO,
252 .p.id = AV_CODEC_ID_IDF,
253 .priv_data_size = sizeof(XbinContext),
254 .init = decode_init,
255 FF_CODEC_DECODE_CB(decode_frame),
256 .p.capabilities = AV_CODEC_CAP_DR1,
257 };
258 #endif
259