blob: 90bbe67b59b69efb83f1833745ff0c09c73796bf
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 = AV_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 = AV_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 = AV_CODEC_CAP_DR1, |
257 | }; |
258 | #endif |
259 |