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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 "libavutil/intreadwrite.h" | |
32 | #include "libavutil/xga_font_data.h" | |
33 | #include "avcodec.h" | |
34 | #include "cga_data.h" | |
35 | #include "bintext.h" | |
36 | #include "internal.h" | |
37 | ||
38 | typedef struct XbinContext { | |
39 | AVFrame *frame; | |
40 | int palette[16]; | |
41 | int flags; | |
42 | int font_height; | |
43 | const uint8_t *font; | |
44 | int x, y; | |
45 | } XbinContext; | |
46 | ||
47 | static av_cold int decode_init(AVCodecContext *avctx) | |
48 | { | |
49 | XbinContext *s = avctx->priv_data; | |
50 | uint8_t *p; | |
51 | int i; | |
52 | ||
53 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
54 | p = avctx->extradata; | |
55 | if (p) { | |
56 | s->font_height = p[0]; | |
57 | s->flags = p[1]; | |
58 | p += 2; | |
59 | if(avctx->extradata_size < 2 + (!!(s->flags & BINTEXT_PALETTE))*3*16 | |
60 | + (!!(s->flags & BINTEXT_FONT))*s->font_height*256) { | |
61 | av_log(avctx, AV_LOG_ERROR, "not enough extradata\n"); | |
62 | return AVERROR_INVALIDDATA; | |
63 | } | |
64 | } else { | |
65 | s->font_height = 8; | |
66 | s->flags = 0; | |
67 | } | |
68 | ||
69 | if ((s->flags & BINTEXT_PALETTE)) { | |
70 | for (i = 0; i < 16; i++) { | |
71 | s->palette[i] = 0xFF000000 | (AV_RB24(p) << 2) | ((AV_RB24(p) >> 4) & 0x30303); | |
72 | p += 3; | |
73 | } | |
74 | } else { | |
75 | for (i = 0; i < 16; i++) | |
76 | s->palette[i] = 0xFF000000 | ff_cga_palette[i]; | |
77 | } | |
78 | ||
79 | if ((s->flags & BINTEXT_FONT)) { | |
80 | s->font = p; | |
81 | } else { | |
82 | switch(s->font_height) { | |
83 | default: | |
84 | av_log(avctx, AV_LOG_WARNING, "font height %i not supported\n", s->font_height); | |
85 | s->font_height = 8; | |
86 | case 8: | |
87 | s->font = avpriv_cga_font; | |
88 | break; | |
89 | case 16: | |
90 | s->font = avpriv_vga16_font; | |
91 | break; | |
92 | } | |
93 | } | |
94 | ||
95 | s->frame = av_frame_alloc(); | |
96 | if (!s->frame) | |
97 | return AVERROR(ENOMEM); | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | #define DEFAULT_BG_COLOR 0 | |
103 | av_unused static void hscroll(AVCodecContext *avctx) | |
104 | { | |
105 | XbinContext *s = avctx->priv_data; | |
106 | if (s->y < avctx->height - s->font_height) { | |
107 | s->y += s->font_height; | |
108 | } else { | |
109 | memmove(s->frame->data[0], s->frame->data[0] + s->font_height*s->frame->linesize[0], | |
110 | (avctx->height - s->font_height)*s->frame->linesize[0]); | |
111 | memset(s->frame->data[0] + (avctx->height - s->font_height)*s->frame->linesize[0], | |
112 | DEFAULT_BG_COLOR, s->font_height * s->frame->linesize[0]); | |
113 | } | |
114 | } | |
115 | ||
116 | #define FONT_WIDTH 8 | |
117 | ||
118 | /** | |
119 | * Draw character to screen | |
120 | */ | |
121 | static void draw_char(AVCodecContext *avctx, int c, int a) | |
122 | { | |
123 | XbinContext *s = avctx->priv_data; | |
124 | if (s->y > avctx->height - s->font_height) | |
125 | return; | |
126 | ff_draw_pc_font(s->frame->data[0] + s->y * s->frame->linesize[0] + s->x, | |
127 | s->frame->linesize[0], s->font, s->font_height, c, | |
128 | a & 0x0F, a >> 4); | |
129 | s->x += FONT_WIDTH; | |
130 | if (s->x > avctx->width - FONT_WIDTH) { | |
131 | s->x = 0; | |
132 | s->y += s->font_height; | |
133 | } | |
134 | } | |
135 | ||
136 | static int decode_frame(AVCodecContext *avctx, | |
137 | void *data, int *got_frame, | |
138 | AVPacket *avpkt) | |
139 | { | |
140 | XbinContext *s = avctx->priv_data; | |
141 | const uint8_t *buf = avpkt->data; | |
142 | int buf_size = avpkt->size; | |
143 | const uint8_t *buf_end = buf+buf_size; | |
144 | int ret; | |
145 | ||
146 | s->x = s->y = 0; | |
147 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) | |
148 | return ret; | |
149 | s->frame->pict_type = AV_PICTURE_TYPE_I; | |
150 | s->frame->palette_has_changed = 1; | |
151 | memcpy(s->frame->data[1], s->palette, 16 * 4); | |
152 | ||
153 | if (avctx->codec_id == AV_CODEC_ID_XBIN) { | |
154 | while (buf + 2 < buf_end) { | |
155 | int i,c,a; | |
156 | int type = *buf >> 6; | |
157 | int count = (*buf & 0x3F) + 1; | |
158 | buf++; | |
159 | switch (type) { | |
160 | case 0: //no compression | |
161 | for (i = 0; i < count && buf + 1 < buf_end; i++) { | |
162 | draw_char(avctx, buf[0], buf[1]); | |
163 | buf += 2; | |
164 | } | |
165 | break; | |
166 | case 1: //character compression | |
167 | c = *buf++; | |
168 | for (i = 0; i < count && buf < buf_end; i++) | |
169 | draw_char(avctx, c, *buf++); | |
170 | break; | |
171 | case 2: //attribute compression | |
172 | a = *buf++; | |
173 | for (i = 0; i < count && buf < buf_end; i++) | |
174 | draw_char(avctx, *buf++, a); | |
175 | break; | |
176 | case 3: //character/attribute compression | |
177 | c = *buf++; | |
178 | a = *buf++; | |
179 | for (i = 0; i < count && buf < buf_end; i++) | |
180 | draw_char(avctx, c, a); | |
181 | break; | |
182 | } | |
183 | } | |
184 | } else if (avctx->codec_id == AV_CODEC_ID_IDF) { | |
185 | while (buf + 2 < buf_end) { | |
186 | if (AV_RL16(buf) == 1) { | |
187 | int i; | |
188 | if (buf + 6 > buf_end) | |
189 | break; | |
190 | for (i = 0; i < buf[2]; i++) | |
191 | draw_char(avctx, buf[4], buf[5]); | |
192 | buf += 6; | |
193 | } else { | |
194 | draw_char(avctx, buf[0], buf[1]); | |
195 | buf += 2; | |
196 | } | |
197 | } | |
198 | } else { | |
199 | while (buf + 1 < buf_end) { | |
200 | draw_char(avctx, buf[0], buf[1]); | |
201 | buf += 2; | |
202 | } | |
203 | } | |
204 | ||
205 | if ((ret = av_frame_ref(data, s->frame)) < 0) | |
206 | return ret; | |
207 | *got_frame = 1; | |
208 | return buf_size; | |
209 | } | |
210 | ||
211 | static av_cold int decode_end(AVCodecContext *avctx) | |
212 | { | |
213 | XbinContext *s = avctx->priv_data; | |
214 | ||
215 | av_frame_free(&s->frame); | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | #if CONFIG_BINTEXT_DECODER | |
221 | AVCodec ff_bintext_decoder = { | |
222 | .name = "bintext", | |
223 | .long_name = NULL_IF_CONFIG_SMALL("Binary text"), | |
224 | .type = AVMEDIA_TYPE_VIDEO, | |
225 | .id = AV_CODEC_ID_BINTEXT, | |
226 | .priv_data_size = sizeof(XbinContext), | |
227 | .init = decode_init, | |
228 | .close = decode_end, | |
229 | .decode = decode_frame, | |
230 | .capabilities = CODEC_CAP_DR1, | |
231 | }; | |
232 | #endif | |
233 | #if CONFIG_XBIN_DECODER | |
234 | AVCodec ff_xbin_decoder = { | |
235 | .name = "xbin", | |
236 | .long_name = NULL_IF_CONFIG_SMALL("eXtended BINary text"), | |
237 | .type = AVMEDIA_TYPE_VIDEO, | |
238 | .id = AV_CODEC_ID_XBIN, | |
239 | .priv_data_size = sizeof(XbinContext), | |
240 | .init = decode_init, | |
241 | .close = decode_end, | |
242 | .decode = decode_frame, | |
243 | .capabilities = CODEC_CAP_DR1, | |
244 | }; | |
245 | #endif | |
246 | #if CONFIG_IDF_DECODER | |
247 | AVCodec ff_idf_decoder = { | |
248 | .name = "idf", | |
249 | .long_name = NULL_IF_CONFIG_SMALL("iCEDraw text"), | |
250 | .type = AVMEDIA_TYPE_VIDEO, | |
251 | .id = AV_CODEC_ID_IDF, | |
252 | .priv_data_size = sizeof(XbinContext), | |
253 | .init = decode_init, | |
254 | .close = decode_end, | |
255 | .decode = decode_frame, | |
256 | .capabilities = CODEC_CAP_DR1, | |
257 | }; | |
258 | #endif |