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 "internal.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
decode_init(AVCodecContext * avctx)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
hscroll(AVCodecContext * avctx)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 */
draw_char(AVCodecContext * avctx,int c,int a)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
decode_frame(AVCodecContext * avctx,AVFrame * frame,int * got_frame,AVPacket * avpkt)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 s->frame->palette_has_changed = 1;
161 memcpy(s->frame->data[1], s->palette, 16 * 4);
162
163 if (avctx->codec_id == AV_CODEC_ID_XBIN) {
164 while (buf + 2 < buf_end) {
165 int i,c,a;
166 int type = *buf >> 6;
167 int count = (*buf & 0x3F) + 1;
168 buf++;
169 switch (type) {
170 case 0: //no compression
171 for (i = 0; i < count && buf + 1 < buf_end; i++) {
172 draw_char(avctx, buf[0], buf[1]);
173 buf += 2;
174 }
175 break;
176 case 1: //character compression
177 c = *buf++;
178 for (i = 0; i < count && buf < buf_end; i++)
179 draw_char(avctx, c, *buf++);
180 break;
181 case 2: //attribute compression
182 a = *buf++;
183 for (i = 0; i < count && buf < buf_end; i++)
184 draw_char(avctx, *buf++, a);
185 break;
186 case 3: //character/attribute compression
187 c = *buf++;
188 a = *buf++;
189 for (i = 0; i < count && buf < buf_end; i++)
190 draw_char(avctx, c, a);
191 break;
192 }
193 }
194 } else if (avctx->codec_id == AV_CODEC_ID_IDF) {
195 while (buf + 2 < buf_end) {
196 if (AV_RL16(buf) == 1) {
197 int i;
198 if (buf + 6 > buf_end)
199 break;
200 for (i = 0; i < buf[2]; i++)
201 draw_char(avctx, buf[4], buf[5]);
202 buf += 6;
203 } else {
204 draw_char(avctx, buf[0], buf[1]);
205 buf += 2;
206 }
207 }
208 } else {
209 while (buf + 1 < buf_end) {
210 draw_char(avctx, buf[0], buf[1]);
211 buf += 2;
212 }
213 }
214
215 *got_frame = 1;
216 return buf_size;
217 }
218
219 #if CONFIG_BINTEXT_DECODER
220 const FFCodec ff_bintext_decoder = {
221 .p.name = "bintext",
222 .p.long_name = NULL_IF_CONFIG_SMALL("Binary text"),
223 .p.type = AVMEDIA_TYPE_VIDEO,
224 .p.id = AV_CODEC_ID_BINTEXT,
225 .priv_data_size = sizeof(XbinContext),
226 .init = decode_init,
227 FF_CODEC_DECODE_CB(decode_frame),
228 .p.capabilities = AV_CODEC_CAP_DR1,
229 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
230 };
231 #endif
232 #if CONFIG_XBIN_DECODER
233 const FFCodec ff_xbin_decoder = {
234 .p.name = "xbin",
235 .p.long_name = NULL_IF_CONFIG_SMALL("eXtended BINary text"),
236 .p.type = AVMEDIA_TYPE_VIDEO,
237 .p.id = AV_CODEC_ID_XBIN,
238 .priv_data_size = sizeof(XbinContext),
239 .init = decode_init,
240 FF_CODEC_DECODE_CB(decode_frame),
241 .p.capabilities = AV_CODEC_CAP_DR1,
242 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
243 };
244 #endif
245 #if CONFIG_IDF_DECODER
246 const FFCodec ff_idf_decoder = {
247 .p.name = "idf",
248 .p.long_name = NULL_IF_CONFIG_SMALL("iCEDraw text"),
249 .p.type = AVMEDIA_TYPE_VIDEO,
250 .p.id = AV_CODEC_ID_IDF,
251 .priv_data_size = sizeof(XbinContext),
252 .init = decode_init,
253 FF_CODEC_DECODE_CB(decode_frame),
254 .p.capabilities = AV_CODEC_CAP_DR1,
255 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
256 };
257 #endif
258