FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ansi.c
Date: 2024-04-25 15:36:26
Exec Total Coverage
Lines: 169 313 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;
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;
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 #if FF_API_PALETTE_HAS_CHANGED
266 FF_DISABLE_DEPRECATION_WARNINGS
267 ✗ s->frame->palette_has_changed = 1;
268 FF_ENABLE_DEPRECATION_WARNINGS
269 #endif
270 ✗ set_palette((uint32_t *)s->frame->data[1]);
271 ✗ erase_screen(avctx);
272 ✗ } else if (c == 'l') {
273 ✗ erase_screen(avctx);
274 }
275 ✗ break;
276 ✗ case 'J': //Erase in Page
277 ✗ switch (s->args[0]) {
278 ✗ case 0:
279 ✗ erase_line(avctx, s->x, avctx->width - s->x);
280 ✗ if (s->y < avctx->height - s->font_height)
281 ✗ memset(s->frame->data[0] + (s->y + s->font_height)*s->frame->linesize[0],
282 ✗ DEFAULT_BG_COLOR, (avctx->height - s->y - s->font_height)*s->frame->linesize[0]);
283 ✗ break;
284 ✗ case 1:
285 ✗ erase_line(avctx, 0, s->x);
286 ✗ if (s->y > 0)
287 ✗ memset(s->frame->data[0], DEFAULT_BG_COLOR, s->y * s->frame->linesize[0]);
288 ✗ break;
289 ✗ case 2:
290 ✗ erase_screen(avctx);
291 }
292 ✗ break;
293 ✗ case 'K': //Erase in Line
294 ✗ switch(s->args[0]) {
295 ✗ case 0:
296 ✗ erase_line(avctx, s->x, avctx->width - s->x);
297 ✗ break;
298 ✗ case 1:
299 ✗ erase_line(avctx, 0, s->x);
300 ✗ break;
301 ✗ case 2:
302 ✗ erase_line(avctx, 0, avctx->width);
303 }
304 ✗ break;
305 3716 case 'm': //Select Graphics Rendition
306
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 3716 if (s->nb_args == 0) {
307 ✗ s->nb_args = 1;
308 ✗ s->args[0] = 0;
309 }
310
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 8955 for (i = 0; i < FFMIN(s->nb_args, MAX_NB_ARGS); i++) {
311 5239 int m = s->args[i];
312
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 5239 if (m == 0) {
313 479 s->attributes = 0;
314 479 s->fg = DEFAULT_FG_COLOR;
315 479 s->bg = DEFAULT_BG_COLOR;
316
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 4760 } else if (m == 1 || m == 2 || m == 3 || m == 4 || m == 5 || m == 7 || m == 8) {
317 477 s->attributes |= 1 << (m - 1);
318
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 4283 } else if (m >= 30 && m <= 37) {
319 1651 s->fg = ansi_to_cga[m - 30];
320
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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) {
321 512 int index = s->args[i + 2];
322
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 512 s->fg = index < 16 ? ansi_to_cga[index] : index;
323 512 i += 2;
324
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 2120 } else if (m == 39) {
325 ✗ s->fg = ansi_to_cga[DEFAULT_FG_COLOR];
326
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 2120 } else if (m >= 40 && m <= 47) {
327 1608 s->bg = ansi_to_cga[m - 40];
328
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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) {
329 512 int index = s->args[i + 2];
330
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 512 s->bg = index < 16 ? ansi_to_cga[index] : index;
331 512 i += 2;
332 ✗ } else if (m == 49) {
333 ✗ s->bg = ansi_to_cga[DEFAULT_BG_COLOR];
334 } else {
335 ✗ avpriv_request_sample(avctx, "Unsupported rendition parameter");
336 }
337 }
338 3716 break;
339 ✗ case 'n': //Device Status Report
340 case 'R': //report current line and column
341 /* ignore */
342 ✗ break;
343 ✗ case 's': //Save Cursor Position
344 ✗ s->sx = s->x;
345 ✗ s->sy = s->y;
346 ✗ break;
347 ✗ case 'u': //Restore Cursor Position
348 ✗ s->x = av_clip(s->sx, 0, avctx->width - FONT_WIDTH);
349 ✗ s->y = av_clip(s->sy, 0, avctx->height - s->font_height);
350 ✗ break;
351 ✗ default:
352 ✗ avpriv_request_sample(avctx, "Unknown escape code");
353 ✗ break;
354 }
355 4624 s->x = av_clip(s->x, 0, avctx->width - FONT_WIDTH);
356 4624 s->y = av_clip(s->y, 0, avctx->height - s->font_height);
357 4624 return 0;
358 }
359
360 25 static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
361 int *got_frame, AVPacket *avpkt)
362 {
363 25 AnsiContext *s = avctx->priv_data;
364 25 const uint8_t *buf = avpkt->data;
365 25 int buf_size = avpkt->size;
366 25 const uint8_t *buf_end = buf+buf_size;
367 int ret, i, count;
368
369
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 25 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
370 ✗ return ret;
371
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 25 if (!avctx->frame_num) {
372
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 802 for (i=0; i<avctx->height; i++)
373 800 memset(s->frame->data[0]+ i*s->frame->linesize[0], 0, avctx->width);
374 2 memset(s->frame->data[1], 0, AVPALETTE_SIZE);
375 }
376
377 25 s->frame->pict_type = AV_PICTURE_TYPE_I;
378 #if FF_API_PALETTE_HAS_CHANGED
379 FF_DISABLE_DEPRECATION_WARNINGS
380 25 s->frame->palette_has_changed = 1;
381 FF_ENABLE_DEPRECATION_WARNINGS
382 #endif
383 25 set_palette((uint32_t *)s->frame->data[1]);
384
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 25 if (!s->first_frame) {
385 2 erase_screen(avctx);
386 2 s->first_frame = 1;
387 }
388
389
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 42502 while(buf < buf_end) {
390
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 42477 switch(s->state) {
391 16136 case STATE_NORMAL:
392
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 16136 switch (buf[0]) {
393 1 case 0x00: //NUL
394 case 0x07: //BEL
395 case 0x1A: //SUB
396 /* ignore */
397 1 break;
398 ✗ case 0x08: //BS
399 ✗ s->x = FFMAX(s->x - 1, 0);
400 ✗ break;
401 256 case 0x09: //HT
402 256 i = s->x / FONT_WIDTH;
403 256 count = ((i + 8) & ~7) - i;
404
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 2048 for (i = 0; i < count; i++)
405 1792 draw_char(avctx, ' ');
406 256 break;
407 485 case 0x0A: //LF
408 485 hscroll(avctx);
409 921 case 0x0D: //CR
410 921 s->x = 0;
411 921 break;
412 ✗ case 0x0C: //FF
413 ✗ erase_screen(avctx);
414 ✗ break;
415 4624 case 0x1B: //ESC
416 4624 s->state = STATE_ESCAPE;
417 4624 break;
418 10334 default:
419 10334 draw_char(avctx, buf[0]);
420 }
421 16136 break;
422 4624 case STATE_ESCAPE:
423
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 4624 if (buf[0] == '[') {
424 4624 s->state = STATE_CODE;
425 4624 s->nb_args = 0;
426 4624 s->args[0] = -1;
427 } else {
428 ✗ s->state = STATE_NORMAL;
429 ✗ draw_char(avctx, 0x1B);
430 ✗ continue;
431 }
432 4624 break;
433 21717 case STATE_CODE:
434
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 21717 switch(buf[0]) {
435 13522 case '0': case '1': case '2': case '3': case '4':
436 case '5': case '6': case '7': case '8': case '9':
437
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 13522 if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] < 6553)
438 13522 s->args[s->nb_args] = FFMAX(s->args[s->nb_args], 0) * 10 + buf[0] - '0';
439 13522 break;
440 3571 case ';':
441
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 3571 if (s->nb_args < MAX_NB_ARGS)
442 3571 s->nb_args++;
443
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 3571 if (s->nb_args < MAX_NB_ARGS)
444 3571 s->args[s->nb_args] = 0;
445 3571 break;
446 ✗ case 'M':
447 ✗ s->state = STATE_MUSIC_PREAMBLE;
448 ✗ break;
449 ✗ case '=': case '?':
450 /* ignore */
451 ✗ break;
452 4624 default:
453
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 4624 if (s->nb_args > MAX_NB_ARGS)
454 ✗ av_log(avctx, AV_LOG_WARNING, "args overflow (%i)\n", s->nb_args);
455
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 4624 if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] >= 0)
456 4188 s->nb_args++;
457
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 4624 if ((ret = execute_code(avctx, buf[0])) < 0)
458 ✗ return ret;
459 4624 s->state = STATE_NORMAL;
460 }
461 21717 break;
462 ✗ case STATE_MUSIC_PREAMBLE:
463 ✗ if (buf[0] == 0x0E || buf[0] == 0x1B)
464 ✗ s->state = STATE_NORMAL;
465 /* ignore music data */
466 ✗ break;
467 }
468 42477 buf++;
469 }
470
471 25 *got_frame = 1;
472
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 25 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
473 ✗ return ret;
474 25 return buf_size;
475 }
476
477 4 static av_cold int decode_close(AVCodecContext *avctx)
478 {
479 4 AnsiContext *s = avctx->priv_data;
480
481 4 av_frame_free(&s->frame);
482 4 return 0;
483 }
484
485 static const FFCodecDefault ansi_defaults[] = {
486 { "max_pixels", "640*480" },
487 { NULL },
488 };
489
490 const FFCodec ff_ansi_decoder = {
491 .p.name = "ansi",
492 CODEC_LONG_NAME("ASCII/ANSI art"),
493 .p.type = AVMEDIA_TYPE_VIDEO,
494 .p.id = AV_CODEC_ID_ANSI,
495 .priv_data_size = sizeof(AnsiContext),
496 .init = decode_init,
497 .close = decode_close,
498 FF_CODEC_DECODE_CB(decode_frame),
499 .p.capabilities = AV_CODEC_CAP_DR1,
500 .defaults = ansi_defaults,
501 };
502