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Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / libavcodec / ansi.c
CommitLineData
2ba45a60
DM		 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_UNDERLINE 0x08 /**< Underline (mode 4) */
38#define ATTR_BLINK 0x10 /**< Blink/Bright-background (mode 5) */
39#define ATTR_REVERSE 0x40 /**< Reverse (mode 7) */
40#define ATTR_CONCEALED 0x80 /**< Concealed (mode 8) */
41
42#define DEFAULT_FG_COLOR 7 /**< CGA color index */
43#define DEFAULT_BG_COLOR 0
44#define DEFAULT_SCREEN_MODE 3 /**< 80x25 */
45
46#define FONT_WIDTH 8 /**< Font width */
47
48/** map ansi color index to cga palette index */
49static const uint8_t ansi_to_cga[16] = {
50 0, 4, 2, 6, 1, 5, 3, 7, 8, 12, 10, 14, 9, 13, 11, 15
51};
52
53typedef struct {
54 AVFrame *frame;
55 int x; /**< x cursor position (pixels) */
56 int y; /**< y cursor position (pixels) */
57 int sx; /**< saved x cursor position (pixels) */
58 int sy; /**< saved y cursor position (pixels) */
59 const uint8_t* font; /**< font */
60 int font_height; /**< font height */
61 int attributes; /**< attribute flags */
62 int fg; /**< foreground color */
63 int bg; /**< background color */
64 int first_frame;
65
66 /* ansi parser state machine */
67 enum {
68 STATE_NORMAL = 0,
69 STATE_ESCAPE,
70 STATE_CODE,
71 STATE_MUSIC_PREAMBLE
72 } state;
73#define MAX_NB_ARGS 4
74 int args[MAX_NB_ARGS];
75 int nb_args; /**< number of arguments (may exceed MAX_NB_ARGS) */
76} AnsiContext;
77
78static av_cold int decode_init(AVCodecContext *avctx)
79{
80 AnsiContext *s = avctx->priv_data;
81 avctx->pix_fmt = AV_PIX_FMT_PAL8;
82
83 s->frame = av_frame_alloc();
84 if (!s->frame)
85 return AVERROR(ENOMEM);
86
87 /* defaults */
88 s->font = avpriv_vga16_font;
89 s->font_height = 16;
90 s->fg = DEFAULT_FG_COLOR;
91 s->bg = DEFAULT_BG_COLOR;
92
f6fa7814
DM		 93 if (!avctx->width || !avctx->height) {
94 int ret = ff_set_dimensions(avctx, 80 << 3, 25 << 4);
95 if (ret < 0)
96 return ret;
97 }
2ba45a60
DM		 98 return 0;
99}
100
101static void set_palette(uint32_t *pal)
102{
103 int r, g, b;
104 memcpy(pal, ff_cga_palette, 16 * 4);
105 pal += 16;
106#define COLOR(x) ((x) * 40 + 55)
107 for (r = 0; r < 6; r++)
108 for (g = 0; g < 6; g++)
109 for (b = 0; b < 6; b++)
110 *pal++ = 0xFF000000 | (COLOR(r) << 16) | (COLOR(g) << 8) | COLOR(b);
111#define GRAY(x) ((x) * 10 + 8)
112 for (g = 0; g < 24; g++)
113 *pal++ = 0xFF000000 | (GRAY(g) << 16) | (GRAY(g) << 8) | GRAY(g);
114}
115
116static void hscroll(AVCodecContext *avctx)
117{
118 AnsiContext *s = avctx->priv_data;
119 int i;
120
121 if (s->y <= avctx->height - 2*s->font_height) {
122 s->y += s->font_height;
123 return;
124 }
125
126 i = 0;
127 for (; i < avctx->height - s->font_height; i++)
128 memcpy(s->frame->data[0] + i * s->frame->linesize[0],
129 s->frame->data[0] + (i + s->font_height) * s->frame->linesize[0],
130 avctx->width);
131 for (; i < avctx->height; i++)
132 memset(s->frame->data[0] + i * s->frame->linesize[0],
133 DEFAULT_BG_COLOR, avctx->width);
134}
135
136static void erase_line(AVCodecContext * avctx, int xoffset, int xlength)
137{
138 AnsiContext *s = avctx->priv_data;
139 int i;
140 for (i = 0; i < s->font_height; i++)
141 memset(s->frame->data[0] + (s->y + i)*s->frame->linesize[0] + xoffset,
142 DEFAULT_BG_COLOR, xlength);
143}
144
145static void erase_screen(AVCodecContext *avctx)
146{
147 AnsiContext *s = avctx->priv_data;
148 int i;
149 for (i = 0; i < avctx->height; i++)
150 memset(s->frame->data[0] + i * s->frame->linesize[0], DEFAULT_BG_COLOR, avctx->width);
151 s->x = s->y = 0;
152}
153
154/**
155 * Draw character to screen
156 */
157static void draw_char(AVCodecContext *avctx, int c)
158{
159 AnsiContext *s = avctx->priv_data;
160 int fg = s->fg;
161 int bg = s->bg;
162
163 if ((s->attributes & ATTR_BOLD))
164 fg += 8;
165 if ((s->attributes & ATTR_BLINK))
166 bg += 8;
167 if ((s->attributes & ATTR_REVERSE))
168 FFSWAP(int, fg, bg);
169 if ((s->attributes & ATTR_CONCEALED))
170 fg = bg;
171 ff_draw_pc_font(s->frame->data[0] + s->y * s->frame->linesize[0] + s->x,
172 s->frame->linesize[0], s->font, s->font_height, c, fg, bg);
173 s->x += FONT_WIDTH;
174 if (s->x > avctx->width - FONT_WIDTH) {
175 s->x = 0;
176 hscroll(avctx);
177 }
178}
179
180/**
181 * Execute ANSI escape code
182 * @return 0 on success, negative on error
183 */
184static int execute_code(AVCodecContext * avctx, int c)
185{
186 AnsiContext *s = avctx->priv_data;
187 int ret, i;
188 int width = avctx->width;
189 int height = avctx->height;
190
191 switch(c) {
192 case 'A': //Cursor Up
193 s->y = FFMAX(s->y - (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), 0);
194 break;
195 case 'B': //Cursor Down
196 s->y = FFMIN(s->y + (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), avctx->height - s->font_height);
197 break;
198 case 'C': //Cursor Right
199 s->x = FFMIN(s->x + (s->nb_args > 0 ? s->args[0]*FONT_WIDTH : FONT_WIDTH), avctx->width - FONT_WIDTH);
200 break;
201 case 'D': //Cursor Left
202 s->x = FFMAX(s->x - (s->nb_args > 0 ? s->args[0]*FONT_WIDTH : FONT_WIDTH), 0);
203 break;
204 case 'H': //Cursor Position
205 case 'f': //Horizontal and Vertical Position
206 s->y = s->nb_args > 0 ? av_clip((s->args[0] - 1)*s->font_height, 0, avctx->height - s->font_height) : 0;
207 s->x = s->nb_args > 1 ? av_clip((s->args[1] - 1)*FONT_WIDTH, 0, avctx->width - FONT_WIDTH) : 0;
208 break;
209 case 'h': //set creen mode
210 case 'l': //reset screen mode
211 if (s->nb_args < 2)
212 s->args[0] = DEFAULT_SCREEN_MODE;
213 switch(s->args[0]) {
214 case 0: case 1: case 4: case 5: case 13: case 19: //320x200 (25 rows)
215 s->font = avpriv_cga_font;
216 s->font_height = 8;
217 width = 40<<3;
218 height = 25<<3;
219 break;
220 case 2: case 3: //640x400 (25 rows)
221 s->font = avpriv_vga16_font;
222 s->font_height = 16;
223 width = 80<<3;
224 height = 25<<4;
225 break;
226 case 6: case 14: //640x200 (25 rows)
227 s->font = avpriv_cga_font;
228 s->font_height = 8;
229 width = 80<<3;
230 height = 25<<3;
231 break;
232 case 7: //set line wrapping
233 break;
234 case 15: case 16: //640x350 (43 rows)
235 s->font = avpriv_cga_font;
236 s->font_height = 8;
237 width = 80<<3;
238 height = 43<<3;
239 break;
240 case 17: case 18: //640x480 (60 rows)
241 s->font = avpriv_cga_font;
242 s->font_height = 8;
243 width = 80<<3;
244 height = 60<<4;
245 break;
246 default:
247 avpriv_request_sample(avctx, "Unsupported screen mode");
248 }
249 s->x = av_clip(s->x, 0, width - FONT_WIDTH);
250 s->y = av_clip(s->y, 0, height - s->font_height);
251 if (width != avctx->width || height != avctx->height) {
252 av_frame_unref(s->frame);
253 ret = ff_set_dimensions(avctx, width, height);
254 if (ret < 0)
255 return ret;
256 if ((ret = ff_get_buffer(avctx, s->frame,
257 AV_GET_BUFFER_FLAG_REF)) < 0)
258 return ret;
259 s->frame->pict_type = AV_PICTURE_TYPE_I;
260 s->frame->palette_has_changed = 1;
261 set_palette((uint32_t *)s->frame->data[1]);
262 erase_screen(avctx);
263 } else if (c == 'l') {
264 erase_screen(avctx);
265 }
266 break;
267 case 'J': //Erase in Page
268 switch (s->args[0]) {
269 case 0:
270 erase_line(avctx, s->x, avctx->width - s->x);
271 if (s->y < avctx->height - s->font_height)
272 memset(s->frame->data[0] + (s->y + s->font_height)*s->frame->linesize[0],
273 DEFAULT_BG_COLOR, (avctx->height - s->y - s->font_height)*s->frame->linesize[0]);
274 break;
275 case 1:
276 erase_line(avctx, 0, s->x);
277 if (s->y > 0)
278 memset(s->frame->data[0], DEFAULT_BG_COLOR, s->y * s->frame->linesize[0]);
279 break;
280 case 2:
281 erase_screen(avctx);
282 }
283 break;
284 case 'K': //Erase in Line
285 switch(s->args[0]) {
286 case 0:
287 erase_line(avctx, s->x, avctx->width - s->x);
288 break;
289 case 1:
290 erase_line(avctx, 0, s->x);
291 break;
292 case 2:
293 erase_line(avctx, 0, avctx->width);
294 }
295 break;
296 case 'm': //Select Graphics Rendition
297 if (s->nb_args == 0) {
298 s->nb_args = 1;
299 s->args[0] = 0;
300 }
301 for (i = 0; i < FFMIN(s->nb_args, MAX_NB_ARGS); i++) {
302 int m = s->args[i];
303 if (m == 0) {
304 s->attributes = 0;
305 s->fg = DEFAULT_FG_COLOR;
306 s->bg = DEFAULT_BG_COLOR;
307 } else if (m == 1 || m == 2 || m == 4 || m == 5 || m == 7 || m == 8) {
308 s->attributes |= 1 << (m - 1);
309 } else if (m >= 30 && m <= 37) {
310 s->fg = ansi_to_cga[m - 30];
311 } else if (m == 38 && i + 2 < FFMIN(s->nb_args, MAX_NB_ARGS) && s->args[i + 1] == 5 && s->args[i + 2] < 256) {
312 int index = s->args[i + 2];
313 s->fg = index < 16 ? ansi_to_cga[index] : index;
314 i += 2;
315 } else if (m == 39) {
316 s->fg = ansi_to_cga[DEFAULT_FG_COLOR];
317 } else if (m >= 40 && m <= 47) {
318 s->bg = ansi_to_cga[m - 40];
319 } else if (m == 48 && i + 2 < FFMIN(s->nb_args, MAX_NB_ARGS) && s->args[i + 1] == 5 && s->args[i + 2] < 256) {
320 int index = s->args[i + 2];
321 s->bg = index < 16 ? ansi_to_cga[index] : index;
322 i += 2;
323 } else if (m == 49) {
324 s->fg = ansi_to_cga[DEFAULT_BG_COLOR];
325 } else {
326 avpriv_request_sample(avctx, "Unsupported rendition parameter");
327 }
328 }
329 break;
330 case 'n': //Device Status Report
331 case 'R': //report current line and column
332 /* ignore */
333 break;
334 case 's': //Save Cursor Position
335 s->sx = s->x;
336 s->sy = s->y;
337 break;
338 case 'u': //Restore Cursor Position
339 s->x = av_clip(s->sx, 0, avctx->width - FONT_WIDTH);
340 s->y = av_clip(s->sy, 0, avctx->height - s->font_height);
341 break;
342 default:
343 avpriv_request_sample(avctx, "Unknown escape code");
344 break;
345 }
346 s->x = av_clip(s->x, 0, avctx->width - FONT_WIDTH);
347 s->y = av_clip(s->y, 0, avctx->height - s->font_height);
348 return 0;
349}
350
351static int decode_frame(AVCodecContext *avctx,
352 void *data, int *got_frame,
353 AVPacket *avpkt)
354{
355 AnsiContext *s = avctx->priv_data;
356 uint8_t *buf = avpkt->data;
357 int buf_size = avpkt->size;
358 const uint8_t *buf_end = buf+buf_size;
359 int ret, i, count;
360
361 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
362 return ret;
363 if (!avctx->frame_number) {
364 for (i=0; i<avctx->height; i++)
365 memset(s->frame->data[0]+ i*s->frame->linesize[0], 0, avctx->width);
366 memset(s->frame->data[1], 0, AVPALETTE_SIZE);
367 }
368
369 s->frame->pict_type = AV_PICTURE_TYPE_I;
370 s->frame->palette_has_changed = 1;
371 set_palette((uint32_t *)s->frame->data[1]);
372 if (!s->first_frame) {
373 erase_screen(avctx);
374 s->first_frame = 1;
375 }
376
377 while(buf < buf_end) {
378 switch(s->state) {
379 case STATE_NORMAL:
380 switch (buf[0]) {
381 case 0x00: //NUL
382 case 0x07: //BEL
383 case 0x1A: //SUB
384 /* ignore */
385 break;
386 case 0x08: //BS
387 s->x = FFMAX(s->x - 1, 0);
388 break;
389 case 0x09: //HT
390 i = s->x / FONT_WIDTH;
391 count = ((i + 8) & ~7) - i;
392 for (i = 0; i < count; i++)
393 draw_char(avctx, ' ');
394 break;
395 case 0x0A: //LF
396 hscroll(avctx);
397 case 0x0D: //CR
398 s->x = 0;
399 break;
400 case 0x0C: //FF
401 erase_screen(avctx);
402 break;
403 case 0x1B: //ESC
404 s->state = STATE_ESCAPE;
405 break;
406 default:
407 draw_char(avctx, buf[0]);
408 }
409 break;
410 case STATE_ESCAPE:
411 if (buf[0] == '[') {
412 s->state = STATE_CODE;
413 s->nb_args = 0;
414 s->args[0] = -1;
415 } else {
416 s->state = STATE_NORMAL;
417 draw_char(avctx, 0x1B);
418 continue;
419 }
420 break;
421 case STATE_CODE:
422 switch(buf[0]) {
423 case '0': case '1': case '2': case '3': case '4':
424 case '5': case '6': case '7': case '8': case '9':
425 if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] < 6553)
426 s->args[s->nb_args] = FFMAX(s->args[s->nb_args], 0) * 10 + buf[0] - '0';
427 break;
428 case ';':
429 s->nb_args++;
430 if (s->nb_args < MAX_NB_ARGS)
431 s->args[s->nb_args] = 0;
432 break;
433 case 'M':
434 s->state = STATE_MUSIC_PREAMBLE;
435 break;
436 case '=': case '?':
437 /* ignore */
438 break;
439 default:
440 if (s->nb_args > MAX_NB_ARGS)
441 av_log(avctx, AV_LOG_WARNING, "args overflow (%i)\n", s->nb_args);
442 if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] >= 0)
443 s->nb_args++;
444 if ((ret = execute_code(avctx, buf[0])) < 0)
445 return ret;
446 s->state = STATE_NORMAL;
447 }
448 break;
449 case STATE_MUSIC_PREAMBLE:
450 if (buf[0] == 0x0E || buf[0] == 0x1B)
451 s->state = STATE_NORMAL;
452 /* ignore music data */
453 break;
454 }
455 buf++;
456 }
457
458 *got_frame = 1;
459 if ((ret = av_frame_ref(data, s->frame)) < 0)
460 return ret;
461 return buf_size;
462}
463
464static av_cold int decode_close(AVCodecContext *avctx)
465{
466 AnsiContext *s = avctx->priv_data;
467
468 av_frame_free(&s->frame);
469 return 0;
470}
471
472AVCodec ff_ansi_decoder = {
473 .name = "ansi",
474 .long_name = NULL_IF_CONFIG_SMALL("ASCII/ANSI art"),
475 .type = AVMEDIA_TYPE_VIDEO,
476 .id = AV_CODEC_ID_ANSI,
477 .priv_data_size = sizeof(AnsiContext),
478 .init = decode_init,
479 .close = decode_close,
480 .decode = decode_frame,
481 .capabilities = CODEC_CAP_DR1,
482};
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