FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/ansi.c
Date: 2021-09-24 03:35:22
Exec Total Coverage
Lines: 169 312 54.2%
Branches: 106 206 51.5%

Line Branch Exec Source
1 /*
2 * ASCII/ANSI art decoder
3 * Copyright (c) 2010 Peter Ross <pross@xvid.org>
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 * ASCII/ANSI art decoder
25 */
26
27 #include "libavutil/common.h"
28 #include "libavutil/frame.h"
29 #include "libavutil/lfg.h"
30 #include "libavutil/xga_font_data.h"
31 #include "avcodec.h"
32 #include "cga_data.h"
33 #include "internal.h"
34
35 #define ATTR_BOLD 0x01 /**< Bold/Bright-foreground (mode 1) */
36 #define ATTR_FAINT 0x02 /**< Faint (mode 2) */
37 #define ATTR_ITALICS 0x04 /**< Italics (mode 3) */
38 #define ATTR_UNDERLINE 0x08 /**< Underline (mode 4) */
39 #define ATTR_BLINK 0x10 /**< Blink/Bright-background (mode 5) */
40 #define ATTR_REVERSE 0x40 /**< Reverse (mode 7) */
41 #define ATTR_CONCEALED 0x80 /**< Concealed (mode 8) */
42
43 #define DEFAULT_FG_COLOR 7 /**< CGA color index */
44 #define DEFAULT_BG_COLOR 0
45 #define DEFAULT_SCREEN_MODE 3 /**< 80x25 */
46
47 #define FONT_WIDTH 8 /**< Font width */
48
49 /** map ansi color index to cga palette index */
50 static const uint8_t ansi_to_cga[16] = {
51 0, 4, 2, 6, 1, 5, 3, 7, 8, 12, 10, 14, 9, 13, 11, 15
52 };
53
54 typedef struct AnsiContext {
55 AVFrame *frame;
56 int x; /**< x cursor position (pixels) */
57 int y; /**< y cursor position (pixels) */
58 int sx; /**< saved x cursor position (pixels) */
59 int sy; /**< saved y cursor position (pixels) */
60 const uint8_t* font; /**< font */
61 int font_height; /**< font height */
62 int attributes; /**< attribute flags */
63 int fg; /**< foreground color */
64 int bg; /**< background color */
65 int first_frame;
66
67 /* ansi parser state machine */
68 enum {
69 STATE_NORMAL = 0,
70 STATE_ESCAPE,
71 STATE_CODE,
72 STATE_MUSIC_PREAMBLE
73 } state;
74 #define MAX_NB_ARGS 4
75 int args[MAX_NB_ARGS];
76 int nb_args; /**< number of arguments (may exceed MAX_NB_ARGS) */
77 } AnsiContext;
78
79 4 static av_cold int decode_init(AVCodecContext *avctx)
80 {
81 4 AnsiContext *s = avctx->priv_data;
82 4 avctx->pix_fmt = AV_PIX_FMT_PAL8;
83
84 /* defaults */
85 4 s->font = avpriv_vga16_font;
86 4 s->font_height = 16;
87 4 s->fg = DEFAULT_FG_COLOR;
88 4 s->bg = DEFAULT_BG_COLOR;
89
90
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6 if (!avctx->width || !avctx->height) {
91 2 int ret = ff_set_dimensions(avctx, 80 << 3, 25 << 4);
92
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2 if (ret < 0)
93 return ret;
94
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2 } else if (avctx->width % FONT_WIDTH || avctx->height % s->font_height) {
95 av_log(avctx, AV_LOG_ERROR, "Invalid dimensions %d %d\n", avctx->width, avctx->height);
96 return AVERROR(EINVAL);
97 }
98
99 4 s->frame = av_frame_alloc();
100
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4 if (!s->frame)
101 return AVERROR(ENOMEM);
102
103 4 return 0;
104 }
105
106 25 static void set_palette(uint32_t *pal)
107 {
108 int r, g, b;
109 25 memcpy(pal, ff_cga_palette, 16 * 4);
110 25 pal += 16;
111 #define COLOR(x) ((x) * 40 + 55)
112
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175 for (r = 0; r < 6; r++)
113
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1050 for (g = 0; g < 6; g++)
114
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6300 for (b = 0; b < 6; b++)
115 5400 *pal++ = 0xFF000000 | (COLOR(r) << 16) | (COLOR(g) << 8) | COLOR(b);
116 #define GRAY(x) ((x) * 10 + 8)
117
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625 for (g = 0; g < 24; g++)
118 600 *pal++ = 0xFF000000 | (GRAY(g) << 16) | (GRAY(g) << 8) | GRAY(g);
119 25 }
120
121 630 static void hscroll(AVCodecContext *avctx)
122 {
123 630 AnsiContext *s = avctx->priv_data;
124 int i;
125
126
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630 if (s->y <= avctx->height - 2*s->font_height) {
127 483 s->y += s->font_height;
128 483 return;
129 }
130
131 147 i = 0;
132
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56595 for (; i < avctx->height - s->font_height; i++)
133 56448 memcpy(s->frame->data[0] + i * s->frame->linesize[0],
134 56448 s->frame->data[0] + (i + s->font_height) * s->frame->linesize[0],
135 56448 avctx->width);
136
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2499 for (; i < avctx->height; i++)
137 2352 memset(s->frame->data[0] + i * s->frame->linesize[0],
138 2352 DEFAULT_BG_COLOR, avctx->width);
139 }
140
141 static void erase_line(AVCodecContext * avctx, int xoffset, int xlength)
142 {
143 AnsiContext *s = avctx->priv_data;
144 int i;
145 for (i = 0; i < s->font_height; i++)
146 memset(s->frame->data[0] + (s->y + i)*s->frame->linesize[0] + xoffset,
147 DEFAULT_BG_COLOR, xlength);
148 }
149
150 2 static void erase_screen(AVCodecContext *avctx)
151 {
152 2 AnsiContext *s = avctx->priv_data;
153 int i;
154
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802 for (i = 0; i < avctx->height; i++)
155 800 memset(s->frame->data[0] + i * s->frame->linesize[0], DEFAULT_BG_COLOR, avctx->width);
156 2 s->x = s->y = 0;
157 2 }
158
159 /**
160 * Draw character to screen
161 */
162 12126 static void draw_char(AVCodecContext *avctx, int c)
163 {
164 12126 AnsiContext *s = avctx->priv_data;
165 12126 int fg = s->fg;
166 12126 int bg = s->bg;
167
168
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12126 if ((s->attributes & ATTR_BOLD))
169 3026 fg += 8;
170
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12126 if ((s->attributes & ATTR_BLINK))
171 bg += 8;
172
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12126 if ((s->attributes & ATTR_REVERSE))
173 FFSWAP(int, fg, bg);
174
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12126 if ((s->attributes & ATTR_CONCEALED))
175 fg = bg;
176 12126 ff_draw_pc_font(s->frame->data[0] + s->y * s->frame->linesize[0] + s->x,
177 12126 s->frame->linesize[0], s->font, s->font_height, c, fg, bg);
178 12126 s->x += FONT_WIDTH;
179
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12126 if (s->x > avctx->width - FONT_WIDTH) {
180 145 s->x = 0;
181 145 hscroll(avctx);
182 }
183 12126 }
184
185 /**
186 * Execute ANSI escape code
187 * @return 0 on success, negative on error
188 */
189 4624 static int execute_code(AVCodecContext * avctx, int c)
190 {
191 4624 AnsiContext *s = avctx->priv_data;
192 int ret, i;
193 4624 int width = avctx->width;
194 4624 int height = avctx->height;
195
196
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4624 switch(c) {
197 435 case 'A': //Cursor Up
198
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435 s->y = FFMAX(s->y - (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), 0);
199 435 break;
200 case 'B': //Cursor Down
201 s->y = FFMIN(s->y + (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), avctx->height - s->font_height);
202 break;
203 473 case 'C': //Cursor Right
204
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473 s->x = FFMIN(s->x + (s->nb_args > 0 ? s->args[0]*FONT_WIDTH : FONT_WIDTH), avctx->width - FONT_WIDTH);
205 473 break;
206 case 'D': //Cursor Left
207 s->x = FFMAX(s->x - (s->nb_args > 0 ? s->args[0]*FONT_WIDTH : FONT_WIDTH), 0);
208 break;
209 case 'H': //Cursor Position
210 case 'f': //Horizontal and Vertical Position
211 s->y = s->nb_args > 0 ? av_clip((s->args[0] - 1)*s->font_height, 0, avctx->height - s->font_height) : 0;
212 s->x = s->nb_args > 1 ? av_clip((s->args[1] - 1)*FONT_WIDTH, 0, avctx->width - FONT_WIDTH) : 0;
213 break;
214 case 'h': //set screen mode
215 case 'l': //reset screen mode
216 if (s->nb_args < 2)
217 s->args[0] = DEFAULT_SCREEN_MODE;
218 switch(s->args[0]) {
219 case 0: case 1: case 4: case 5: case 13: case 19: //320x200 (25 rows)
220 s->font = avpriv_cga_font;
221 s->font_height = 8;
222 width = 40<<3;
223 height = 25<<3;
224 break;
225 case 2: case 3: //640x400 (25 rows)
226 s->font = avpriv_vga16_font;
227 s->font_height = 16;
228 width = 80<<3;
229 height = 25<<4;
230 break;
231 case 6: case 14: //640x200 (25 rows)
232 s->font = avpriv_cga_font;
233 s->font_height = 8;
234 width = 80<<3;
235 height = 25<<3;
236 break;
237 case 7: //set line wrapping
238 break;
239 case 15: case 16: //640x350 (43 rows)
240 s->font = avpriv_cga_font;
241 s->font_height = 8;
242 width = 80<<3;
243 height = 43<<3;
244 break;
245 case 17: case 18: //640x480 (60 rows)
246 s->font = avpriv_cga_font;
247 s->font_height = 8;
248 width = 80<<3;
249 height = 60<<4;
250 break;
251 default:
252 avpriv_request_sample(avctx, "Unsupported screen mode");
253 }
254 s->x = av_clip(s->x, 0, width - FONT_WIDTH);
255 s->y = av_clip(s->y, 0, height - s->font_height);
256 if (width != avctx->width || height != avctx->height) {
257 av_frame_unref(s->frame);
258 ret = ff_set_dimensions(avctx, width, height);
259 if (ret < 0)
260 return ret;
261 if ((ret = ff_get_buffer(avctx, s->frame,
262 AV_GET_BUFFER_FLAG_REF)) < 0)
263 return ret;
264 s->frame->pict_type = AV_PICTURE_TYPE_I;
265 s->frame->palette_has_changed = 1;
266 set_palette((uint32_t *)s->frame->data[1]);
267 erase_screen(avctx);
268 } else if (c == 'l') {
269 erase_screen(avctx);
270 }
271 break;
272 case 'J': //Erase in Page
273 switch (s->args[0]) {
274 case 0:
275 erase_line(avctx, s->x, avctx->width - s->x);
276 if (s->y < avctx->height - s->font_height)
277 memset(s->frame->data[0] + (s->y + s->font_height)*s->frame->linesize[0],
278 DEFAULT_BG_COLOR, (avctx->height - s->y - s->font_height)*s->frame->linesize[0]);
279 break;
280 case 1:
281 erase_line(avctx, 0, s->x);
282 if (s->y > 0)
283 memset(s->frame->data[0], DEFAULT_BG_COLOR, s->y * s->frame->linesize[0]);
284 break;
285 case 2:
286 erase_screen(avctx);
287 }
288 break;
289 case 'K': //Erase in Line
290 switch(s->args[0]) {
291 case 0:
292 erase_line(avctx, s->x, avctx->width - s->x);
293 break;
294 case 1:
295 erase_line(avctx, 0, s->x);
296 break;
297 case 2:
298 erase_line(avctx, 0, avctx->width);
299 }
300 break;
301 3716 case 'm': //Select Graphics Rendition
302
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3716 if (s->nb_args == 0) {
303 s->nb_args = 1;
304 s->args[0] = 0;
305 }
306
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8955 for (i = 0; i < FFMIN(s->nb_args, MAX_NB_ARGS); i++) {
307 5239 int m = s->args[i];
308
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5239 if (m == 0) {
309 479 s->attributes = 0;
310 479 s->fg = DEFAULT_FG_COLOR;
311 479 s->bg = DEFAULT_BG_COLOR;
312
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4760 } else if (m == 1 || m == 2 || m == 3 || m == 4 || m == 5 || m == 7 || m == 8) {
313 477 s->attributes |= 1 << (m - 1);
314
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4283 } else if (m >= 30 && m <= 37) {
315 1651 s->fg = ansi_to_cga[m - 30];
316
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2632 } else if (m == 38 && i + 2 < FFMIN(s->nb_args, MAX_NB_ARGS) && s->args[i + 1] == 5 && s->args[i + 2] < 256) {
317 512 int index = s->args[i + 2];
318
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512 s->fg = index < 16 ? ansi_to_cga[index] : index;
319 512 i += 2;
320
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2120 } else if (m == 39) {
321 s->fg = ansi_to_cga[DEFAULT_FG_COLOR];
322
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2120 } else if (m >= 40 && m <= 47) {
323 1608 s->bg = ansi_to_cga[m - 40];
324
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512 } else if (m == 48 && i + 2 < FFMIN(s->nb_args, MAX_NB_ARGS) && s->args[i + 1] == 5 && s->args[i + 2] < 256) {
325 512 int index = s->args[i + 2];
326
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512 s->bg = index < 16 ? ansi_to_cga[index] : index;
327 512 i += 2;
328 } else if (m == 49) {
329 s->fg = ansi_to_cga[DEFAULT_BG_COLOR];
330 } else {
331 avpriv_request_sample(avctx, "Unsupported rendition parameter");
332 }
333 }
334 3716 break;
335 case 'n': //Device Status Report
336 case 'R': //report current line and column
337 /* ignore */
338 break;
339 case 's': //Save Cursor Position
340 s->sx = s->x;
341 s->sy = s->y;
342 break;
343 case 'u': //Restore Cursor Position
344 s->x = av_clip(s->sx, 0, avctx->width - FONT_WIDTH);
345 s->y = av_clip(s->sy, 0, avctx->height - s->font_height);
346 break;
347 default:
348 avpriv_request_sample(avctx, "Unknown escape code");
349 break;
350 }
351 4624 s->x = av_clip(s->x, 0, avctx->width - FONT_WIDTH);
352 4624 s->y = av_clip(s->y, 0, avctx->height - s->font_height);
353 4624 return 0;
354 }
355
356 25 static int decode_frame(AVCodecContext *avctx,
357 void *data, int *got_frame,
358 AVPacket *avpkt)
359 {
360 25 AnsiContext *s = avctx->priv_data;
361 25 uint8_t *buf = avpkt->data;
362 25 int buf_size = avpkt->size;
363 25 const uint8_t *buf_end = buf+buf_size;
364 int ret, i, count;
365
366
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25 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
367 return ret;
368
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25 if (!avctx->frame_number) {
369
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802 for (i=0; i<avctx->height; i++)
370 800 memset(s->frame->data[0]+ i*s->frame->linesize[0], 0, avctx->width);
371 2 memset(s->frame->data[1], 0, AVPALETTE_SIZE);
372 }
373
374 25 s->frame->pict_type = AV_PICTURE_TYPE_I;
375 25 s->frame->palette_has_changed = 1;
376 25 set_palette((uint32_t *)s->frame->data[1]);
377
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25 if (!s->first_frame) {
378 2 erase_screen(avctx);
379 2 s->first_frame = 1;
380 }
381
382
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42502 while(buf < buf_end) {
383
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42477 switch(s->state) {
384 16136 case STATE_NORMAL:
385
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16136 switch (buf[0]) {
386 1 case 0x00: //NUL
387 case 0x07: //BEL
388 case 0x1A: //SUB
389 /* ignore */
390 1 break;
391 case 0x08: //BS
392 s->x = FFMAX(s->x - 1, 0);
393 break;
394 256 case 0x09: //HT
395 256 i = s->x / FONT_WIDTH;
396 256 count = ((i + 8) & ~7) - i;
397
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2048 for (i = 0; i < count; i++)
398 1792 draw_char(avctx, ' ');
399 256 break;
400 485 case 0x0A: //LF
401 485 hscroll(avctx);
402 921 case 0x0D: //CR
403 921 s->x = 0;
404 921 break;
405 case 0x0C: //FF
406 erase_screen(avctx);
407 break;
408 4624 case 0x1B: //ESC
409 4624 s->state = STATE_ESCAPE;
410 4624 break;
411 10334 default:
412 10334 draw_char(avctx, buf[0]);
413 }
414 16136 break;
415 4624 case STATE_ESCAPE:
416
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4624 if (buf[0] == '[') {
417 4624 s->state = STATE_CODE;
418 4624 s->nb_args = 0;
419 4624 s->args[0] = -1;
420 } else {
421 s->state = STATE_NORMAL;
422 draw_char(avctx, 0x1B);
423 continue;
424 }
425 4624 break;
426 21717 case STATE_CODE:
427
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21717 switch(buf[0]) {
428 13522 case '0': case '1': case '2': case '3': case '4':
429 case '5': case '6': case '7': case '8': case '9':
430
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13522 if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] < 6553)
431 13522 s->args[s->nb_args] = FFMAX(s->args[s->nb_args], 0) * 10 + buf[0] - '0';
432 13522 break;
433 3571 case ';':
434
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3571 if (s->nb_args < MAX_NB_ARGS)
435 3571 s->nb_args++;
436
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3571 if (s->nb_args < MAX_NB_ARGS)
437 3571 s->args[s->nb_args] = 0;
438 3571 break;
439 case 'M':
440 s->state = STATE_MUSIC_PREAMBLE;
441 break;
442 case '=': case '?':
443 /* ignore */
444 break;
445 4624 default:
446
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4624 if (s->nb_args > MAX_NB_ARGS)
447 av_log(avctx, AV_LOG_WARNING, "args overflow (%i)\n", s->nb_args);
448
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4624 if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] >= 0)
449 4188 s->nb_args++;
450
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4624 if ((ret = execute_code(avctx, buf[0])) < 0)
451 return ret;
452 4624 s->state = STATE_NORMAL;
453 }
454 21717 break;
455 case STATE_MUSIC_PREAMBLE:
456 if (buf[0] == 0x0E || buf[0] == 0x1B)
457 s->state = STATE_NORMAL;
458 /* ignore music data */
459 break;
460 }
461 42477 buf++;
462 }
463
464 25 *got_frame = 1;
465
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25 if ((ret = av_frame_ref(data, s->frame)) < 0)
466 return ret;
467 25 return buf_size;
468 }
469
470 4 static av_cold int decode_close(AVCodecContext *avctx)
471 {
472 4 AnsiContext *s = avctx->priv_data;
473
474 4 av_frame_free(&s->frame);
475 4 return 0;
476 }
477
478 static const AVCodecDefault ansi_defaults[] = {
479 { "max_pixels", "640*480" },
480 { NULL },
481 };
482
483 const AVCodec ff_ansi_decoder = {
484 .name = "ansi",
485 .long_name = NULL_IF_CONFIG_SMALL("ASCII/ANSI art"),
486 .type = AVMEDIA_TYPE_VIDEO,
487 .id = AV_CODEC_ID_ANSI,
488 .priv_data_size = sizeof(AnsiContext),
489 .init = decode_init,
490 .close = decode_close,
491 .decode = decode_frame,
492 .capabilities = AV_CODEC_CAP_DR1,
493 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
494 .defaults = ansi_defaults,
495 };
496