FFmpeg  4.3.8
ansi.c
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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"
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 {
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 */
66 
67  /* ansi parser state machine */
68  enum {
73  } state;
74 #define MAX_NB_ARGS 4
76  int nb_args; /**< number of arguments (may exceed MAX_NB_ARGS) */
77 } AnsiContext;
78 
80 {
81  AnsiContext *s = avctx->priv_data;
82  avctx->pix_fmt = AV_PIX_FMT_PAL8;
83 
84  /* defaults */
86  s->font_height = 16;
87  s->fg = DEFAULT_FG_COLOR;
88  s->bg = DEFAULT_BG_COLOR;
89 
90  if (!avctx->width || !avctx->height) {
91  int ret = ff_set_dimensions(avctx, 80 << 3, 25 << 4);
92  if (ret < 0)
93  return ret;
94  } 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  s->frame = av_frame_alloc();
100  if (!s->frame)
101  return AVERROR(ENOMEM);
102 
103  return 0;
104 }
105 
106 static void set_palette(uint32_t *pal)
107 {
108  int r, g, b;
109  memcpy(pal, ff_cga_palette, 16 * 4);
110  pal += 16;
111 #define COLOR(x) ((x) * 40 + 55)
112  for (r = 0; r < 6; r++)
113  for (g = 0; g < 6; g++)
114  for (b = 0; b < 6; b++)
115  *pal++ = 0xFF000000 | (COLOR(r) << 16) | (COLOR(g) << 8) | COLOR(b);
116 #define GRAY(x) ((x) * 10 + 8)
117  for (g = 0; g < 24; g++)
118  *pal++ = 0xFF000000 | (GRAY(g) << 16) | (GRAY(g) << 8) | GRAY(g);
119 }
120 
121 static void hscroll(AVCodecContext *avctx)
122 {
123  AnsiContext *s = avctx->priv_data;
124  int i;
125 
126  if (s->y <= avctx->height - 2*s->font_height) {
127  s->y += s->font_height;
128  return;
129  }
130 
131  i = 0;
132  for (; i < avctx->height - s->font_height; i++)
133  memcpy(s->frame->data[0] + i * s->frame->linesize[0],
134  s->frame->data[0] + (i + s->font_height) * s->frame->linesize[0],
135  avctx->width);
136  for (; i < avctx->height; i++)
137  memset(s->frame->data[0] + i * s->frame->linesize[0],
138  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 static void erase_screen(AVCodecContext *avctx)
151 {
152  AnsiContext *s = avctx->priv_data;
153  int i;
154  for (i = 0; i < avctx->height; i++)
155  memset(s->frame->data[0] + i * s->frame->linesize[0], DEFAULT_BG_COLOR, avctx->width);
156  s->x = s->y = 0;
157 }
158 
159 /**
160  * Draw character to screen
161  */
162 static void draw_char(AVCodecContext *avctx, int c)
163 {
164  AnsiContext *s = avctx->priv_data;
165  int fg = s->fg;
166  int bg = s->bg;
167 
168  if ((s->attributes & ATTR_BOLD))
169  fg += 8;
170  if ((s->attributes & ATTR_BLINK))
171  bg += 8;
172  if ((s->attributes & ATTR_REVERSE))
173  FFSWAP(int, fg, bg);
174  if ((s->attributes & ATTR_CONCEALED))
175  fg = bg;
176  ff_draw_pc_font(s->frame->data[0] + s->y * s->frame->linesize[0] + s->x,
177  s->frame->linesize[0], s->font, s->font_height, c, fg, bg);
178  s->x += FONT_WIDTH;
179  if (s->x > avctx->width - FONT_WIDTH) {
180  s->x = 0;
181  hscroll(avctx);
182  }
183 }
184 
185 /**
186  * Execute ANSI escape code
187  * @return 0 on success, negative on error
188  */
189 static int execute_code(AVCodecContext * avctx, int c)
190 {
191  AnsiContext *s = avctx->priv_data;
192  int ret, i;
193  int width = avctx->width;
194  int height = avctx->height;
195 
196  switch(c) {
197  case 'A': //Cursor Up
198  s->y = FFMAX(s->y - (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), 0);
199  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  case 'C': //Cursor Right
204  s->x = FFMIN(s->x + (s->nb_args > 0 ? s->args[0]*FONT_WIDTH : FONT_WIDTH), avctx->width - FONT_WIDTH);
205  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,
263  return ret;
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  case 'm': //Select Graphics Rendition
302  if (s->nb_args == 0) {
303  s->nb_args = 1;
304  s->args[0] = 0;
305  }
306  for (i = 0; i < FFMIN(s->nb_args, MAX_NB_ARGS); i++) {
307  int m = s->args[i];
308  if (m == 0) {
309  s->attributes = 0;
310  s->fg = DEFAULT_FG_COLOR;
311  s->bg = DEFAULT_BG_COLOR;
312  } else if (m == 1 || m == 2 || m == 3 || m == 4 || m == 5 || m == 7 || m == 8) {
313  s->attributes |= 1 << (m - 1);
314  } else if (m >= 30 && m <= 37) {
315  s->fg = ansi_to_cga[m - 30];
316  } else if (m == 38 && i + 2 < FFMIN(s->nb_args, MAX_NB_ARGS) && s->args[i + 1] == 5 && s->args[i + 2] < 256) {
317  int index = s->args[i + 2];
318  s->fg = index < 16 ? ansi_to_cga[index] : index;
319  i += 2;
320  } else if (m == 39) {
322  } else if (m >= 40 && m <= 47) {
323  s->bg = ansi_to_cga[m - 40];
324  } else if (m == 48 && i + 2 < FFMIN(s->nb_args, MAX_NB_ARGS) && s->args[i + 1] == 5 && s->args[i + 2] < 256) {
325  int index = s->args[i + 2];
326  s->bg = index < 16 ? ansi_to_cga[index] : index;
327  i += 2;
328  } else if (m == 49) {
330  } else {
331  avpriv_request_sample(avctx, "Unsupported rendition parameter");
332  }
333  }
334  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  s->x = av_clip(s->x, 0, avctx->width - FONT_WIDTH);
352  s->y = av_clip(s->y, 0, avctx->height - s->font_height);
353  return 0;
354 }
355 
356 static int decode_frame(AVCodecContext *avctx,
357  void *data, int *got_frame,
358  AVPacket *avpkt)
359 {
360  AnsiContext *s = avctx->priv_data;
361  uint8_t *buf = avpkt->data;
362  int buf_size = avpkt->size;
363  const uint8_t *buf_end = buf+buf_size;
364  int ret, i, count;
365 
366  if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
367  return ret;
368  if (!avctx->frame_number) {
369  for (i=0; i<avctx->height; i++)
370  memset(s->frame->data[0]+ i*s->frame->linesize[0], 0, avctx->width);
371  memset(s->frame->data[1], 0, AVPALETTE_SIZE);
372  }
373 
375  s->frame->palette_has_changed = 1;
376  set_palette((uint32_t *)s->frame->data[1]);
377  if (!s->first_frame) {
378  erase_screen(avctx);
379  s->first_frame = 1;
380  }
381 
382  while(buf < buf_end) {
383  switch(s->state) {
384  case STATE_NORMAL:
385  switch (buf[0]) {
386  case 0x00: //NUL
387  case 0x07: //BEL
388  case 0x1A: //SUB
389  /* ignore */
390  break;
391  case 0x08: //BS
392  s->x = FFMAX(s->x - 1, 0);
393  break;
394  case 0x09: //HT
395  i = s->x / FONT_WIDTH;
396  count = ((i + 8) & ~7) - i;
397  for (i = 0; i < count; i++)
398  draw_char(avctx, ' ');
399  break;
400  case 0x0A: //LF
401  hscroll(avctx);
402  case 0x0D: //CR
403  s->x = 0;
404  break;
405  case 0x0C: //FF
406  erase_screen(avctx);
407  break;
408  case 0x1B: //ESC
409  s->state = STATE_ESCAPE;
410  break;
411  default:
412  draw_char(avctx, buf[0]);
413  }
414  break;
415  case STATE_ESCAPE:
416  if (buf[0] == '[') {
417  s->state = STATE_CODE;
418  s->nb_args = 0;
419  s->args[0] = -1;
420  } else {
421  s->state = STATE_NORMAL;
422  draw_char(avctx, 0x1B);
423  continue;
424  }
425  break;
426  case STATE_CODE:
427  switch(buf[0]) {
428  case '0': case '1': case '2': case '3': case '4':
429  case '5': case '6': case '7': case '8': case '9':
430  if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] < 6553)
431  s->args[s->nb_args] = FFMAX(s->args[s->nb_args], 0) * 10 + buf[0] - '0';
432  break;
433  case ';':
434  if (s->nb_args < MAX_NB_ARGS)
435  s->nb_args++;
436  if (s->nb_args < MAX_NB_ARGS)
437  s->args[s->nb_args] = 0;
438  break;
439  case 'M':
441  break;
442  case '=': case '?':
443  /* ignore */
444  break;
445  default:
446  if (s->nb_args > MAX_NB_ARGS)
447  av_log(avctx, AV_LOG_WARNING, "args overflow (%i)\n", s->nb_args);
448  if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] >= 0)
449  s->nb_args++;
450  if ((ret = execute_code(avctx, buf[0])) < 0)
451  return ret;
452  s->state = STATE_NORMAL;
453  }
454  break;
456  if (buf[0] == 0x0E || buf[0] == 0x1B)
457  s->state = STATE_NORMAL;
458  /* ignore music data */
459  break;
460  }
461  buf++;
462  }
463 
464  *got_frame = 1;
465  if ((ret = av_frame_ref(data, s->frame)) < 0)
466  return ret;
467  return buf_size;
468 }
469 
471 {
472  AnsiContext *s = avctx->priv_data;
473 
474  av_frame_free(&s->frame);
475  return 0;
476 }
477 
478 static const AVCodecDefault ansi_defaults[] = {
479  { "max_pixels", "640*480" },
480  { NULL },
481 };
482 
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 };
static void draw_char(AVCodecContext *avctx, int c)
Draw character to screen.
Definition: ansi.c:162
#define NULL
Definition: coverity.c:32
#define FONT_WIDTH
Font width.
Definition: ansi.c:47
int x
x cursor position (pixels)
Definition: ansi.c:56
#define ATTR_REVERSE
Reverse (mode 7)
Definition: ansi.c:40
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
int bg
background color
Definition: ansi.c:64
#define ATTR_CONCEALED
Concealed (mode 8)
Definition: ansi.c:41
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:104
const char * g
Definition: vf_curves.c:115
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
#define avpriv_request_sample(...)
int nb_args
number of arguments (may exceed MAX_NB_ARGS)
Definition: ansi.c:76
int size
Definition: packet.h:356
const char * b
Definition: vf_curves.c:116
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
const uint8_t avpriv_vga16_font[4096]
#define DEFAULT_SCREEN_MODE
80x25
Definition: ansi.c:45
static const AVCodecDefault ansi_defaults[]
Definition: ansi.c:478
AVCodec.
Definition: codec.h:190
static void erase_screen(AVCodecContext *avctx)
Definition: ansi.c:150
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
static int execute_code(AVCodecContext *avctx, int c)
Execute ANSI escape code.
Definition: ansi.c:189
static void hscroll(AVCodecContext *avctx)
Definition: ansi.c:121
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:40
uint8_t
#define av_cold
Definition: attributes.h:88
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:444
const char data[16]
Definition: mxf.c:91
#define height
uint8_t * data
Definition: packet.h:355
CGA/EGA/VGA ROM data.
#define DEFAULT_BG_COLOR
Definition: ansi.c:44
static av_cold int decode_close(AVCodecContext *avctx)
Definition: ansi.c:470
#define av_log(a,...)
const uint8_t * font
font
Definition: ansi.c:60
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int sy
saved y cursor position (pixels)
Definition: ansi.c:59
const uint8_t avpriv_cga_font[2048]
Definition: xga_font_data.c:29
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Identical in function to ff_get_buffer(), except it reuses the existing buffer if available...
Definition: decode.c:1961
const char * r
Definition: vf_curves.c:114
static void erase_line(AVCodecContext *avctx, int xoffset, int xlength)
Definition: ansi.c:141
const char * name
Name of the codec implementation.
Definition: codec.h:197
static const AVCodecDefault defaults[]
Definition: amfenc_h264.c:361
#define FFMAX(a, b)
Definition: common.h:94
reference-counted frame API
#define ATTR_BLINK
Blink/Bright-background (mode 5)
Definition: ansi.c:39
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:383
#define FFMIN(a, b)
Definition: common.h:96
#define width
int width
picture width / height.
Definition: avcodec.h:699
#define s(width, name)
Definition: cbs_vp9.c:257
static av_cold int decode_init(AVCodecContext *avctx)
Definition: ansi.c:79
#define ATTR_BOLD
Bold/Bright-foreground (mode 1)
Definition: ansi.c:35
void ff_draw_pc_font(uint8_t *dst, int linesize, const uint8_t *font, int font_height, int ch, int fg, int bg)
Draw CGA/EGA/VGA font to 8-bit pixel buffer.
Definition: cga_data.c:46
Libavcodec external API header.
int font_height
font height
Definition: ansi.c:61
int args[MAX_NB_ARGS]
Definition: ansi.c:75
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:331
main external API structure.
Definition: avcodec.h:526
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1854
int index
Definition: gxfenc.c:89
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:457
int fg
foreground color
Definition: ansi.c:63
static const uint8_t ansi_to_cga[16]
map ansi color index to cga palette index
Definition: ansi.c:50
#define GRAY(x)
static void set_palette(uint32_t *pal)
Definition: ansi.c:106
const uint32_t ff_cga_palette[16]
Definition: cga_data.c:30
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:554
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
int sx
saved x cursor position (pixels)
Definition: ansi.c:58
common internal api header.
common internal and external API header
static double c[64]
AVFrame * frame
Definition: ansi.c:55
int y
y cursor position (pixels)
Definition: ansi.c:57
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: ansi.c:356
int first_frame
Definition: ansi.c:65
enum AnsiContext::@13 state
void * priv_data
Definition: avcodec.h:553
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:1217
#define MAX_NB_ARGS
Definition: ansi.c:74
#define DEFAULT_FG_COLOR
CGA color index.
Definition: ansi.c:43
#define FFSWAP(type, a, b)
Definition: common.h:99
int attributes
attribute flags
Definition: ansi.c:62
This structure stores compressed data.
Definition: packet.h:332
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:509
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
CGA/EGA/VGA ROM font data.
AVCodec ff_ansi_decoder
Definition: ansi.c:483
#define COLOR(x)