FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ansi.c
Date: 2026-01-16 07:34:38
Exec Total Coverage
Lines: 168 311 54.0%
Functions: 8 9 88.9%
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/xga_font_data.h"
30 #include "avcodec.h"
31 #include "cga_data.h"
32 #include "codec_internal.h"
33 #include "decode.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_get();
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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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_get();
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_get();
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_get();
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_get();
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_get();
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 ✗ set_palette((uint32_t *)s->frame->data[1]);
266 ✗ erase_screen(avctx);
267 ✗ } else if (c == 'l') {
268 ✗ erase_screen(avctx);
269 }
270 ✗ break;
271 ✗ case 'J': //Erase in Page
272 ✗ switch (s->args[0]) {
273 ✗ case 0:
274 ✗ erase_line(avctx, s->x, avctx->width - s->x);
275 ✗ if (s->y < avctx->height - s->font_height)
276 ✗ memset(s->frame->data[0] + (s->y + s->font_height)*s->frame->linesize[0],
277 ✗ DEFAULT_BG_COLOR, (avctx->height - s->y - s->font_height)*s->frame->linesize[0]);
278 ✗ break;
279 ✗ case 1:
280 ✗ erase_line(avctx, 0, s->x);
281 ✗ if (s->y > 0)
282 ✗ memset(s->frame->data[0], DEFAULT_BG_COLOR, s->y * s->frame->linesize[0]);
283 ✗ break;
284 ✗ case 2:
285 ✗ erase_screen(avctx);
286 }
287 ✗ break;
288 ✗ case 'K': //Erase in Line
289 ✗ switch(s->args[0]) {
290 ✗ case 0:
291 ✗ erase_line(avctx, s->x, avctx->width - s->x);
292 ✗ break;
293 ✗ case 1:
294 ✗ erase_line(avctx, 0, s->x);
295 ✗ break;
296 ✗ case 2:
297 ✗ erase_line(avctx, 0, avctx->width);
298 }
299 ✗ break;
300 3716 case 'm': //Select Graphics Rendition
301
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 3716 if (s->nb_args == 0) {
302 ✗ s->nb_args = 1;
303 ✗ s->args[0] = 0;
304 }
305
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 8955 for (i = 0; i < FFMIN(s->nb_args, MAX_NB_ARGS); i++) {
306 5239 int m = s->args[i];
307
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 5239 if (m == 0) {
308 479 s->attributes = 0;
309 479 s->fg = DEFAULT_FG_COLOR;
310 479 s->bg = DEFAULT_BG_COLOR;
311
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 4760 } else if (m == 1 || m == 2 || m == 3 || m == 4 || m == 5 || m == 7 || m == 8) {
312 477 s->attributes |= 1 << (m - 1);
313
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 4283 } else if (m >= 30 && m <= 37) {
314 1651 s->fg = ansi_to_cga[m - 30];
315
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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) {
316 512 int index = s->args[i + 2];
317
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 512 s->fg = index < 16 ? ansi_to_cga[index] : index;
318 512 i += 2;
319
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 2120 } else if (m == 39) {
320 ✗ s->fg = ansi_to_cga[DEFAULT_FG_COLOR];
321
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 2120 } else if (m >= 40 && m <= 47) {
322 1608 s->bg = ansi_to_cga[m - 40];
323
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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) {
324 512 int index = s->args[i + 2];
325
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 512 s->bg = index < 16 ? ansi_to_cga[index] : index;
326 512 i += 2;
327 ✗ } else if (m == 49) {
328 ✗ s->bg = ansi_to_cga[DEFAULT_BG_COLOR];
329 } else {
330 ✗ avpriv_request_sample(avctx, "Unsupported rendition parameter");
331 }
332 }
333 3716 break;
334 ✗ case 'n': //Device Status Report
335 case 'R': //report current line and column
336 /* ignore */
337 ✗ break;
338 ✗ case 's': //Save Cursor Position
339 ✗ s->sx = s->x;
340 ✗ s->sy = s->y;
341 ✗ break;
342 ✗ case 'u': //Restore Cursor Position
343 ✗ s->x = av_clip(s->sx, 0, avctx->width - FONT_WIDTH);
344 ✗ s->y = av_clip(s->sy, 0, avctx->height - s->font_height);
345 ✗ break;
346 ✗ default:
347 ✗ avpriv_request_sample(avctx, "Unknown escape code");
348 ✗ break;
349 }
350 4624 s->x = av_clip(s->x, 0, avctx->width - FONT_WIDTH);
351 4624 s->y = av_clip(s->y, 0, avctx->height - s->font_height);
352 4624 return 0;
353 }
354
355 25 static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
356 int *got_frame, AVPacket *avpkt)
357 {
358 25 AnsiContext *s = avctx->priv_data;
359 25 const uint8_t *buf = avpkt->data;
360 25 int buf_size = avpkt->size;
361 25 const uint8_t *buf_end = buf+buf_size;
362 int ret, i, count;
363
364
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 25 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
365 ✗ return ret;
366
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 25 if (!avctx->frame_num) {
367
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 802 for (i=0; i<avctx->height; i++)
368 800 memset(s->frame->data[0]+ i*s->frame->linesize[0], 0, avctx->width);
369 2 memset(s->frame->data[1], 0, AVPALETTE_SIZE);
370 }
371
372 25 s->frame->pict_type = AV_PICTURE_TYPE_I;
373 25 set_palette((uint32_t *)s->frame->data[1]);
374
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 25 if (!s->first_frame) {
375 2 erase_screen(avctx);
376 2 s->first_frame = 1;
377 }
378
379
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 42502 while(buf < buf_end) {
380
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 42477 switch(s->state) {
381 16136 case STATE_NORMAL:
382
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 16136 switch (buf[0]) {
383 1 case 0x00: //NUL
384 case 0x07: //BEL
385 case 0x1A: //SUB
386 /* ignore */
387 1 break;
388 ✗ case 0x08: //BS
389 ✗ s->x = FFMAX(s->x - 1, 0);
390 ✗ break;
391 256 case 0x09: //HT
392 256 i = s->x / FONT_WIDTH;
393 256 count = ((i + 8) & ~7) - i;
394
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 2048 for (i = 0; i < count; i++)
395 1792 draw_char(avctx, ' ');
396 256 break;
397 485 case 0x0A: //LF
398 485 hscroll(avctx);
399 921 case 0x0D: //CR
400 921 s->x = 0;
401 921 break;
402 ✗ case 0x0C: //FF
403 ✗ erase_screen(avctx);
404 ✗ break;
405 4624 case 0x1B: //ESC
406 4624 s->state = STATE_ESCAPE;
407 4624 break;
408 10334 default:
409 10334 draw_char(avctx, buf[0]);
410 }
411 16136 break;
412 4624 case STATE_ESCAPE:
413
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 4624 if (buf[0] == '[') {
414 4624 s->state = STATE_CODE;
415 4624 s->nb_args = 0;
416 4624 s->args[0] = -1;
417 } else {
418 ✗ s->state = STATE_NORMAL;
419 ✗ draw_char(avctx, 0x1B);
420 ✗ continue;
421 }
422 4624 break;
423 21717 case STATE_CODE:
424
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 21717 switch(buf[0]) {
425 13522 case '0': case '1': case '2': case '3': case '4':
426 case '5': case '6': case '7': case '8': case '9':
427
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 13522 if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] < 6553)
428 13522 s->args[s->nb_args] = FFMAX(s->args[s->nb_args], 0) * 10 + buf[0] - '0';
429 13522 break;
430 3571 case ';':
431
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 3571 if (s->nb_args < MAX_NB_ARGS)
432 3571 s->nb_args++;
433
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 3571 if (s->nb_args < MAX_NB_ARGS)
434 3571 s->args[s->nb_args] = 0;
435 3571 break;
436 ✗ case 'M':
437 ✗ s->state = STATE_MUSIC_PREAMBLE;
438 ✗ break;
439 ✗ case '=': case '?':
440 /* ignore */
441 ✗ break;
442 4624 default:
443
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 4624 if (s->nb_args > MAX_NB_ARGS)
444 ✗ av_log(avctx, AV_LOG_WARNING, "args overflow (%i)\n", s->nb_args);
445
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 4624 if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] >= 0)
446 4188 s->nb_args++;
447
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 4624 if ((ret = execute_code(avctx, buf[0])) < 0)
448 ✗ return ret;
449 4624 s->state = STATE_NORMAL;
450 }
451 21717 break;
452 ✗ case STATE_MUSIC_PREAMBLE:
453 ✗ if (buf[0] == 0x0E || buf[0] == 0x1B)
454 ✗ s->state = STATE_NORMAL;
455 /* ignore music data */
456 ✗ break;
457 }
458 42477 buf++;
459 }
460
461 25 *got_frame = 1;
462
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 25 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
463 ✗ return ret;
464 25 return buf_size;
465 }
466
467 4 static av_cold int decode_close(AVCodecContext *avctx)
468 {
469 4 AnsiContext *s = avctx->priv_data;
470
471 4 av_frame_free(&s->frame);
472 4 return 0;
473 }
474
475 static const FFCodecDefault ansi_defaults[] = {
476 { "max_pixels", "640*480" },
477 { NULL },
478 };
479
480 const FFCodec ff_ansi_decoder = {
481 .p.name = "ansi",
482 CODEC_LONG_NAME("ASCII/ANSI art"),
483 .p.type = AVMEDIA_TYPE_VIDEO,
484 .p.id = AV_CODEC_ID_ANSI,
485 .priv_data_size = sizeof(AnsiContext),
486 .init = decode_init,
487 .close = decode_close,
488 FF_CODEC_DECODE_CB(decode_frame),
489 .p.capabilities = AV_CODEC_CAP_DR1,
490 .defaults = ansi_defaults,
491 };
492