FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ansi.c
Date: 2026-05-02 21:46:34
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/attributes.h"
28 #include "libavutil/common.h"
29 #include "libavutil/frame.h"
30 #include "libavutil/xga_font_data.h"
31 #include "avcodec.h"
32 #include "cga_data.h"
33 #include "codec_internal.h"
34 #include "decode.h"
35
36 #define ATTR_BOLD 0x01 /**< Bold/Bright-foreground (mode 1) */
37 #define ATTR_FAINT 0x02 /**< Faint (mode 2) */
38 #define ATTR_ITALICS 0x04 /**< Italics (mode 3) */
39 #define ATTR_UNDERLINE 0x08 /**< Underline (mode 4) */
40 #define ATTR_BLINK 0x10 /**< Blink/Bright-background (mode 5) */
41 #define ATTR_REVERSE 0x40 /**< Reverse (mode 7) */
42 #define ATTR_CONCEALED 0x80 /**< Concealed (mode 8) */
43
44 #define DEFAULT_FG_COLOR 7 /**< CGA color index */
45 #define DEFAULT_BG_COLOR 0
46 #define DEFAULT_SCREEN_MODE 3 /**< 80x25 */
47
48 #define FONT_WIDTH 8 /**< Font width */
49
50 /** map ansi color index to cga palette index */
51 static const uint8_t ansi_to_cga[16] = {
52 0, 4, 2, 6, 1, 5, 3, 7, 8, 12, 10, 14, 9, 13, 11, 15
53 };
54
55 typedef struct AnsiContext {
56 AVFrame *frame;
57 int x; /**< x cursor position (pixels) */
58 int y; /**< y cursor position (pixels) */
59 int sx; /**< saved x cursor position (pixels) */
60 int sy; /**< saved y cursor position (pixels) */
61 const uint8_t* font; /**< font */
62 int font_height; /**< font height */
63 int attributes; /**< attribute flags */
64 int fg; /**< foreground color */
65 int bg; /**< background color */
66 int first_frame;
67
68 /* ansi parser state machine */
69 enum {
70 STATE_NORMAL = 0,
71 STATE_ESCAPE,
72 STATE_CODE,
73 STATE_MUSIC_PREAMBLE
74 } state;
75 #define MAX_NB_ARGS 4
76 int args[MAX_NB_ARGS];
77 int nb_args; /**< number of arguments (may exceed MAX_NB_ARGS) */
78 } AnsiContext;
79
80 4 static av_cold int decode_init(AVCodecContext *avctx)
81 {
82 4 AnsiContext *s = avctx->priv_data;
83 4 avctx->pix_fmt = AV_PIX_FMT_PAL8;
84
85 /* defaults */
86 4 s->font = avpriv_vga16_font_get();
87 4 s->font_height = 16;
88 4 s->fg = DEFAULT_FG_COLOR;
89 4 s->bg = DEFAULT_BG_COLOR;
90
91
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 6 if (!avctx->width || !avctx->height) {
92 2 int ret = ff_set_dimensions(avctx, 80 << 3, 25 << 4);
93
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 2 if (ret < 0)
94 ✗ return ret;
95
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 2 } else if (avctx->width % FONT_WIDTH || avctx->height % s->font_height) {
96 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid dimensions %d %d\n", avctx->width, avctx->height);
97 ✗ return AVERROR(EINVAL);
98 }
99
100 4 s->frame = av_frame_alloc();
101
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 4 if (!s->frame)
102 ✗ return AVERROR(ENOMEM);
103
104 4 return 0;
105 }
106
107 25 static void set_palette(uint32_t *pal)
108 {
109 int r, g, b;
110 25 memcpy(pal, ff_cga_palette, 16 * 4);
111 25 pal += 16;
112 #define COLOR(x) ((x) * 40 + 55)
113
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 175 for (r = 0; r < 6; r++)
114
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115
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116 5400 *pal++ = 0xFF000000 | (COLOR(r) << 16) | (COLOR(g) << 8) | COLOR(b);
117 #define GRAY(x) ((x) * 10 + 8)
118
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 625 for (g = 0; g < 24; g++)
119 600 *pal++ = 0xFF000000 | (GRAY(g) << 16) | (GRAY(g) << 8) | GRAY(g);
120 25 }
121
122 630 static void hscroll(AVCodecContext *avctx)
123 {
124 630 AnsiContext *s = avctx->priv_data;
125 int i;
126
127
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 630 if (s->y <= avctx->height - 2*s->font_height) {
128 483 s->y += s->font_height;
129 483 return;
130 }
131
132 147 i = 0;
133
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 56595 for (; i < avctx->height - s->font_height; i++)
134 56448 memcpy(s->frame->data[0] + i * s->frame->linesize[0],
135 56448 s->frame->data[0] + (i + s->font_height) * s->frame->linesize[0],
136 56448 avctx->width);
137
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 2499 for (; i < avctx->height; i++)
138 2352 memset(s->frame->data[0] + i * s->frame->linesize[0],
139 2352 DEFAULT_BG_COLOR, avctx->width);
140 }
141
142 ✗ static void erase_line(AVCodecContext * avctx, int xoffset, int xlength)
143 {
144 ✗ AnsiContext *s = avctx->priv_data;
145 int i;
146 ✗ for (i = 0; i < s->font_height; i++)
147 ✗ memset(s->frame->data[0] + (s->y + i)*s->frame->linesize[0] + xoffset,
148 DEFAULT_BG_COLOR, xlength);
149 ✗ }
150
151 2 static void erase_screen(AVCodecContext *avctx)
152 {
153 2 AnsiContext *s = avctx->priv_data;
154 int i;
155
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 802 for (i = 0; i < avctx->height; i++)
156 800 memset(s->frame->data[0] + i * s->frame->linesize[0], DEFAULT_BG_COLOR, avctx->width);
157 2 s->x = s->y = 0;
158 2 }
159
160 /**
161 * Draw character to screen
162 */
163 12126 static void draw_char(AVCodecContext *avctx, int c)
164 {
165 12126 AnsiContext *s = avctx->priv_data;
166 12126 int fg = s->fg;
167 12126 int bg = s->bg;
168
169
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 12126 if ((s->attributes & ATTR_BOLD))
170 3026 fg += 8;
171
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 12126 if ((s->attributes & ATTR_BLINK))
172 ✗ bg += 8;
173
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 12126 if ((s->attributes & ATTR_REVERSE))
174 ✗ FFSWAP(int, fg, bg);
175
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 12126 if ((s->attributes & ATTR_CONCEALED))
176 ✗ fg = bg;
177 12126 ff_draw_pc_font(s->frame->data[0] + s->y * s->frame->linesize[0] + s->x,
178 12126 s->frame->linesize[0], s->font, s->font_height, c, fg, bg);
179 12126 s->x += FONT_WIDTH;
180
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 12126 if (s->x > avctx->width - FONT_WIDTH) {
181 145 s->x = 0;
182 145 hscroll(avctx);
183 }
184 12126 }
185
186 /**
187 * Execute ANSI escape code
188 * @return 0 on success, negative on error
189 */
190 4624 static int execute_code(AVCodecContext * avctx, int c)
191 {
192 4624 AnsiContext *s = avctx->priv_data;
193 int ret, i;
194 4624 int width = avctx->width;
195 4624 int height = avctx->height;
196
197
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 4624 switch(c) {
198 435 case 'A': //Cursor Up
199
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 435 s->y = FFMAX(s->y - (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), 0);
200 435 break;
201 ✗ case 'B': //Cursor Down
202 ✗ s->y = FFMIN(s->y + (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), avctx->height - s->font_height);
203 ✗ break;
204 473 case 'C': //Cursor Right
205
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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);
206 473 break;
207 ✗ case 'D': //Cursor Left
208 ✗ s->x = FFMAX(s->x - (s->nb_args > 0 ? s->args[0]*FONT_WIDTH : FONT_WIDTH), 0);
209 ✗ break;
210 ✗ case 'H': //Cursor Position
211 case 'f': //Horizontal and Vertical Position
212 ✗ s->y = s->nb_args > 0 ? av_clip((s->args[0] - 1)*s->font_height, 0, avctx->height - s->font_height) : 0;
213 ✗ s->x = s->nb_args > 1 ? av_clip((s->args[1] - 1)*FONT_WIDTH, 0, avctx->width - FONT_WIDTH) : 0;
214 ✗ break;
215 ✗ case 'h': //set screen mode
216 case 'l': //reset screen mode
217 ✗ if (s->nb_args < 2)
218 ✗ s->args[0] = DEFAULT_SCREEN_MODE;
219 ✗ switch(s->args[0]) {
220 ✗ case 0: case 1: case 4: case 5: case 13: case 19: //320x200 (25 rows)
221 ✗ s->font = avpriv_cga_font_get();
222 ✗ s->font_height = 8;
223 ✗ width = 40<<3;
224 ✗ height = 25<<3;
225 ✗ break;
226 ✗ case 2: case 3: //640x400 (25 rows)
227 ✗ s->font = avpriv_vga16_font_get();
228 ✗ s->font_height = 16;
229 ✗ width = 80<<3;
230 ✗ height = 25<<4;
231 ✗ break;
232 ✗ case 6: case 14: //640x200 (25 rows)
233 ✗ s->font = avpriv_cga_font_get();
234 ✗ s->font_height = 8;
235 ✗ width = 80<<3;
236 ✗ height = 25<<3;
237 ✗ break;
238 ✗ case 7: //set line wrapping
239 ✗ break;
240 ✗ case 15: case 16: //640x350 (43 rows)
241 ✗ s->font = avpriv_cga_font_get();
242 ✗ s->font_height = 8;
243 ✗ width = 80<<3;
244 ✗ height = 43<<3;
245 ✗ break;
246 ✗ case 17: case 18: //640x480 (60 rows)
247 ✗ s->font = avpriv_cga_font_get();
248 ✗ s->font_height = 8;
249 ✗ width = 80<<3;
250 ✗ height = 60<<4;
251 ✗ break;
252 ✗ default:
253 ✗ avpriv_request_sample(avctx, "Unsupported screen mode");
254 }
255 ✗ s->x = av_clip(s->x, 0, width - FONT_WIDTH);
256 ✗ s->y = av_clip(s->y, 0, height - s->font_height);
257 ✗ if (width != avctx->width || height != avctx->height) {
258 ✗ av_frame_unref(s->frame);
259 ✗ ret = ff_set_dimensions(avctx, width, height);
260 ✗ if (ret < 0)
261 ✗ return ret;
262 ✗ if ((ret = ff_get_buffer(avctx, s->frame,
263 AV_GET_BUFFER_FLAG_REF)) < 0)
264 ✗ return ret;
265 ✗ s->frame->pict_type = AV_PICTURE_TYPE_I;
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->bg = 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, AVFrame *rframe,
357 int *got_frame, AVPacket *avpkt)
358 {
359 25 AnsiContext *s = avctx->priv_data;
360 25 const uint8_t *buf = avpkt->data;
361 25 int buf_size = avpkt->size;
362 25 const uint8_t *buf_end = buf+buf_size;
363 int ret, i, count;
364
365
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 25 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
366 ✗ return ret;
367
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 25 if (!avctx->frame_num) {
368
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 802 for (i=0; i<avctx->height; i++)
369 800 memset(s->frame->data[0]+ i*s->frame->linesize[0], 0, avctx->width);
370 2 memset(s->frame->data[1], 0, AVPALETTE_SIZE);
371 }
372
373 25 s->frame->pict_type = AV_PICTURE_TYPE_I;
374 25 set_palette((uint32_t *)s->frame->data[1]);
375
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 25 if (!s->first_frame) {
376 2 erase_screen(avctx);
377 2 s->first_frame = 1;
378 }
379
380
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 42502 while(buf < buf_end) {
381
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 42477 switch(s->state) {
382 16136 case STATE_NORMAL:
383
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 16136 switch (buf[0]) {
384 1 case 0x00: //NUL
385 case 0x07: //BEL
386 case 0x1A: //SUB
387 /* ignore */
388 1 break;
389 ✗ case 0x08: //BS
390 ✗ s->x = FFMAX(s->x - 1, 0);
391 ✗ break;
392 256 case 0x09: //HT
393 256 i = s->x / FONT_WIDTH;
394 256 count = ((i + 8) & ~7) - i;
395
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 2048 for (i = 0; i < count; i++)
396 1792 draw_char(avctx, ' ');
397 256 break;
398 485 case 0x0A: //LF
399 485 hscroll(avctx);
400 av_fallthrough;
401 921 case 0x0D: //CR
402 921 s->x = 0;
403 921 break;
404 ✗ case 0x0C: //FF
405 ✗ erase_screen(avctx);
406 ✗ break;
407 4624 case 0x1B: //ESC
408 4624 s->state = STATE_ESCAPE;
409 4624 break;
410 10334 default:
411 10334 draw_char(avctx, buf[0]);
412 }
413 16136 break;
414 4624 case STATE_ESCAPE:
415
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 4624 if (buf[0] == '[') {
416 4624 s->state = STATE_CODE;
417 4624 s->nb_args = 0;
418 4624 s->args[0] = -1;
419 } else {
420 ✗ s->state = STATE_NORMAL;
421 ✗ draw_char(avctx, 0x1B);
422 ✗ continue;
423 }
424 4624 break;
425 21717 case STATE_CODE:
426
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 21717 switch(buf[0]) {
427 13522 case '0': case '1': case '2': case '3': case '4':
428 case '5': case '6': case '7': case '8': case '9':
429
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 13522 if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] < 6553)
430 13522 s->args[s->nb_args] = FFMAX(s->args[s->nb_args], 0) * 10 + buf[0] - '0';
431 13522 break;
432 3571 case ';':
433
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 3571 if (s->nb_args < MAX_NB_ARGS)
434 3571 s->nb_args++;
435
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 3571 if (s->nb_args < MAX_NB_ARGS)
436 3571 s->args[s->nb_args] = 0;
437 3571 break;
438 ✗ case 'M':
439 ✗ s->state = STATE_MUSIC_PREAMBLE;
440 ✗ break;
441 ✗ case '=': case '?':
442 /* ignore */
443 ✗ break;
444 4624 default:
445
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 4624 if (s->nb_args > MAX_NB_ARGS)
446 ✗ av_log(avctx, AV_LOG_WARNING, "args overflow (%i)\n", s->nb_args);
447
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 4624 if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] >= 0)
448 4188 s->nb_args++;
449
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 4624 if ((ret = execute_code(avctx, buf[0])) < 0)
450 ✗ return ret;
451 4624 s->state = STATE_NORMAL;
452 }
453 21717 break;
454 ✗ case STATE_MUSIC_PREAMBLE:
455 ✗ if (buf[0] == 0x0E || buf[0] == 0x1B)
456 ✗ s->state = STATE_NORMAL;
457 /* ignore music data */
458 ✗ break;
459 }
460 42477 buf++;
461 }
462
463 25 *got_frame = 1;
464
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 25 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
465 ✗ return ret;
466 25 return buf_size;
467 }
468
469 4 static av_cold int decode_close(AVCodecContext *avctx)
470 {
471 4 AnsiContext *s = avctx->priv_data;
472
473 4 av_frame_free(&s->frame);
474 4 return 0;
475 }
476
477 static const FFCodecDefault ansi_defaults[] = {
478 { "max_pixels", "640*480" },
479 { NULL },
480 };
481
482 const FFCodec ff_ansi_decoder = {
483 .p.name = "ansi",
484 CODEC_LONG_NAME("ASCII/ANSI art"),
485 .p.type = AVMEDIA_TYPE_VIDEO,
486 .p.id = AV_CODEC_ID_ANSI,
487 .priv_data_size = sizeof(AnsiContext),
488 .init = decode_init,
489 .close = decode_close,
490 FF_CODEC_DECODE_CB(decode_frame),
491 .p.capabilities = AV_CODEC_CAP_DR1,
492 .defaults = ansi_defaults,
493 };
494