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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_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 */
49 static 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 
53 typedef struct AnsiContext {
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 */
65 
66  /* ansi parser state machine */
67  enum {
72  } state;
73 #define MAX_NB_ARGS 4
75  int nb_args; /**< number of arguments (may exceed MAX_NB_ARGS) */
76 } AnsiContext;
77 
79 {
80  AnsiContext *s = avctx->priv_data;
81  avctx->pix_fmt = AV_PIX_FMT_PAL8;
82 
83  /* defaults */
85  s->font_height = 16;
86  s->fg = DEFAULT_FG_COLOR;
87  s->bg = DEFAULT_BG_COLOR;
88 
89  if (!avctx->width || !avctx->height) {
90  int ret = ff_set_dimensions(avctx, 80 << 3, 25 << 4);
91  if (ret < 0)
92  return ret;
93  } else if (avctx->width % FONT_WIDTH || avctx->height % s->font_height) {
94  av_log(avctx, AV_LOG_ERROR, "Invalid dimensions %d %d\n", avctx->width, avctx->height);
95  return AVERROR(EINVAL);
96  }
97 
98  s->frame = av_frame_alloc();
99  if (!s->frame)
100  return AVERROR(ENOMEM);
101 
102  return 0;
103 }
104 
105 static void set_palette(uint32_t *pal)
106 {
107  int r, g, b;
108  memcpy(pal, ff_cga_palette, 16 * 4);
109  pal += 16;
110 #define COLOR(x) ((x) * 40 + 55)
111  for (r = 0; r < 6; r++)
112  for (g = 0; g < 6; g++)
113  for (b = 0; b < 6; b++)
114  *pal++ = 0xFF000000 | (COLOR(r) << 16) | (COLOR(g) << 8) | COLOR(b);
115 #define GRAY(x) ((x) * 10 + 8)
116  for (g = 0; g < 24; g++)
117  *pal++ = 0xFF000000 | (GRAY(g) << 16) | (GRAY(g) << 8) | GRAY(g);
118 }
119 
120 static void hscroll(AVCodecContext *avctx)
121 {
122  AnsiContext *s = avctx->priv_data;
123  int i;
124 
125  if (s->y <= avctx->height - 2*s->font_height) {
126  s->y += s->font_height;
127  return;
128  }
129 
130  i = 0;
131  for (; i < avctx->height - s->font_height; i++)
132  memcpy(s->frame->data[0] + i * s->frame->linesize[0],
133  s->frame->data[0] + (i + s->font_height) * s->frame->linesize[0],
134  avctx->width);
135  for (; i < avctx->height; i++)
136  memset(s->frame->data[0] + i * s->frame->linesize[0],
137  DEFAULT_BG_COLOR, avctx->width);
138 }
139 
140 static void erase_line(AVCodecContext * avctx, int xoffset, int xlength)
141 {
142  AnsiContext *s = avctx->priv_data;
143  int i;
144  for (i = 0; i < s->font_height; i++)
145  memset(s->frame->data[0] + (s->y + i)*s->frame->linesize[0] + xoffset,
146  DEFAULT_BG_COLOR, xlength);
147 }
148 
149 static void erase_screen(AVCodecContext *avctx)
150 {
151  AnsiContext *s = avctx->priv_data;
152  int i;
153  for (i = 0; i < avctx->height; i++)
154  memset(s->frame->data[0] + i * s->frame->linesize[0], DEFAULT_BG_COLOR, avctx->width);
155  s->x = s->y = 0;
156 }
157 
158 /**
159  * Draw character to screen
160  */
161 static void draw_char(AVCodecContext *avctx, int c)
162 {
163  AnsiContext *s = avctx->priv_data;
164  int fg = s->fg;
165  int bg = s->bg;
166 
167  if ((s->attributes & ATTR_BOLD))
168  fg += 8;
169  if ((s->attributes & ATTR_BLINK))
170  bg += 8;
171  if ((s->attributes & ATTR_REVERSE))
172  FFSWAP(int, fg, bg);
173  if ((s->attributes & ATTR_CONCEALED))
174  fg = bg;
175  ff_draw_pc_font(s->frame->data[0] + s->y * s->frame->linesize[0] + s->x,
176  s->frame->linesize[0], s->font, s->font_height, c, fg, bg);
177  s->x += FONT_WIDTH;
178  if (s->x > avctx->width - FONT_WIDTH) {
179  s->x = 0;
180  hscroll(avctx);
181  }
182 }
183 
184 /**
185  * Execute ANSI escape code
186  * @return 0 on success, negative on error
187  */
188 static int execute_code(AVCodecContext * avctx, int c)
189 {
190  AnsiContext *s = avctx->priv_data;
191  int ret, i;
192  int width = avctx->width;
193  int height = avctx->height;
194 
195  switch(c) {
196  case 'A': //Cursor Up
197  s->y = FFMAX(s->y - (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), 0);
198  break;
199  case 'B': //Cursor Down
200  s->y = FFMIN(s->y + (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), avctx->height - s->font_height);
201  break;
202  case 'C': //Cursor Right
203  s->x = FFMIN(s->x + (s->nb_args > 0 ? s->args[0]*FONT_WIDTH : FONT_WIDTH), avctx->width - FONT_WIDTH);
204  break;
205  case 'D': //Cursor Left
206  s->x = FFMAX(s->x - (s->nb_args > 0 ? s->args[0]*FONT_WIDTH : FONT_WIDTH), 0);
207  break;
208  case 'H': //Cursor Position
209  case 'f': //Horizontal and Vertical Position
210  s->y = s->nb_args > 0 ? av_clip((s->args[0] - 1)*s->font_height, 0, avctx->height - s->font_height) : 0;
211  s->x = s->nb_args > 1 ? av_clip((s->args[1] - 1)*FONT_WIDTH, 0, avctx->width - FONT_WIDTH) : 0;
212  break;
213  case 'h': //set screen mode
214  case 'l': //reset screen mode
215  if (s->nb_args < 2)
216  s->args[0] = DEFAULT_SCREEN_MODE;
217  switch(s->args[0]) {
218  case 0: case 1: case 4: case 5: case 13: case 19: //320x200 (25 rows)
219  s->font = avpriv_cga_font;
220  s->font_height = 8;
221  width = 40<<3;
222  height = 25<<3;
223  break;
224  case 2: case 3: //640x400 (25 rows)
225  s->font = avpriv_vga16_font;
226  s->font_height = 16;
227  width = 80<<3;
228  height = 25<<4;
229  break;
230  case 6: case 14: //640x200 (25 rows)
231  s->font = avpriv_cga_font;
232  s->font_height = 8;
233  width = 80<<3;
234  height = 25<<3;
235  break;
236  case 7: //set line wrapping
237  break;
238  case 15: case 16: //640x350 (43 rows)
239  s->font = avpriv_cga_font;
240  s->font_height = 8;
241  width = 80<<3;
242  height = 43<<3;
243  break;
244  case 17: case 18: //640x480 (60 rows)
245  s->font = avpriv_cga_font;
246  s->font_height = 8;
247  width = 80<<3;
248  height = 60<<4;
249  break;
250  default:
251  avpriv_request_sample(avctx, "Unsupported screen mode");
252  }
253  s->x = av_clip(s->x, 0, width - FONT_WIDTH);
254  s->y = av_clip(s->y, 0, height - s->font_height);
255  if (width != avctx->width || height != avctx->height) {
256  av_frame_unref(s->frame);
257  ret = ff_set_dimensions(avctx, width, height);
258  if (ret < 0)
259  return ret;
260  if ((ret = ff_get_buffer(avctx, s->frame,
262  return ret;
264  s->frame->palette_has_changed = 1;
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  case 'm': //Select Graphics Rendition
301  if (s->nb_args == 0) {
302  s->nb_args = 1;
303  s->args[0] = 0;
304  }
305  for (i = 0; i < FFMIN(s->nb_args, MAX_NB_ARGS); i++) {
306  int m = s->args[i];
307  if (m == 0) {
308  s->attributes = 0;
309  s->fg = DEFAULT_FG_COLOR;
310  s->bg = DEFAULT_BG_COLOR;
311  } else if (m == 1 || m == 2 || m == 4 || m == 5 || m == 7 || m == 8) {
312  s->attributes |= 1 << (m - 1);
313  } else if (m >= 30 && m <= 37) {
314  s->fg = ansi_to_cga[m - 30];
315  } else if (m == 38 && i + 2 < FFMIN(s->nb_args, MAX_NB_ARGS) && s->args[i + 1] == 5 && s->args[i + 2] < 256) {
316  int index = s->args[i + 2];
317  s->fg = index < 16 ? ansi_to_cga[index] : index;
318  i += 2;
319  } else if (m == 39) {
321  } else if (m >= 40 && m <= 47) {
322  s->bg = ansi_to_cga[m - 40];
323  } else if (m == 48 && i + 2 < FFMIN(s->nb_args, MAX_NB_ARGS) && s->args[i + 1] == 5 && s->args[i + 2] < 256) {
324  int index = s->args[i + 2];
325  s->bg = index < 16 ? ansi_to_cga[index] : index;
326  i += 2;
327  } else if (m == 49) {
329  } else {
330  avpriv_request_sample(avctx, "Unsupported rendition parameter");
331  }
332  }
333  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  s->x = av_clip(s->x, 0, avctx->width - FONT_WIDTH);
351  s->y = av_clip(s->y, 0, avctx->height - s->font_height);
352  return 0;
353 }
354 
355 static int decode_frame(AVCodecContext *avctx,
356  void *data, int *got_frame,
357  AVPacket *avpkt)
358 {
359  AnsiContext *s = avctx->priv_data;
360  uint8_t *buf = avpkt->data;
361  int buf_size = avpkt->size;
362  const uint8_t *buf_end = buf+buf_size;
363  int ret, i, count;
364 
365  if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
366  return ret;
367  if (!avctx->frame_number) {
368  for (i=0; i<avctx->height; i++)
369  memset(s->frame->data[0]+ i*s->frame->linesize[0], 0, avctx->width);
370  memset(s->frame->data[1], 0, AVPALETTE_SIZE);
371  }
372 
374  s->frame->palette_has_changed = 1;
375  set_palette((uint32_t *)s->frame->data[1]);
376  if (!s->first_frame) {
377  erase_screen(avctx);
378  s->first_frame = 1;
379  }
380 
381  while(buf < buf_end) {
382  switch(s->state) {
383  case STATE_NORMAL:
384  switch (buf[0]) {
385  case 0x00: //NUL
386  case 0x07: //BEL
387  case 0x1A: //SUB
388  /* ignore */
389  break;
390  case 0x08: //BS
391  s->x = FFMAX(s->x - 1, 0);
392  break;
393  case 0x09: //HT
394  i = s->x / FONT_WIDTH;
395  count = ((i + 8) & ~7) - i;
396  for (i = 0; i < count; i++)
397  draw_char(avctx, ' ');
398  break;
399  case 0x0A: //LF
400  hscroll(avctx);
401  case 0x0D: //CR
402  s->x = 0;
403  break;
404  case 0x0C: //FF
405  erase_screen(avctx);
406  break;
407  case 0x1B: //ESC
408  s->state = STATE_ESCAPE;
409  break;
410  default:
411  draw_char(avctx, buf[0]);
412  }
413  break;
414  case STATE_ESCAPE:
415  if (buf[0] == '[') {
416  s->state = STATE_CODE;
417  s->nb_args = 0;
418  s->args[0] = -1;
419  } else {
420  s->state = STATE_NORMAL;
421  draw_char(avctx, 0x1B);
422  continue;
423  }
424  break;
425  case STATE_CODE:
426  switch(buf[0]) {
427  case '0': case '1': case '2': case '3': case '4':
428  case '5': case '6': case '7': case '8': case '9':
429  if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] < 6553)
430  s->args[s->nb_args] = FFMAX(s->args[s->nb_args], 0) * 10 + buf[0] - '0';
431  break;
432  case ';':
433  s->nb_args++;
434  if (s->nb_args < MAX_NB_ARGS)
435  s->args[s->nb_args] = 0;
436  break;
437  case 'M':
438  s->state = STATE_MUSIC_PREAMBLE;
439  break;
440  case '=': case '?':
441  /* ignore */
442  break;
443  default:
444  if (s->nb_args > MAX_NB_ARGS)
445  av_log(avctx, AV_LOG_WARNING, "args overflow (%i)\n", s->nb_args);
446  if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] >= 0)
447  s->nb_args++;
448  if ((ret = execute_code(avctx, buf[0])) < 0)
449  return ret;
450  s->state = STATE_NORMAL;
451  }
452  break;
453  case STATE_MUSIC_PREAMBLE:
454  if (buf[0] == 0x0E || buf[0] == 0x1B)
455  s->state = STATE_NORMAL;
456  /* ignore music data */
457  break;
458  }
459  buf++;
460  }
461 
462  *got_frame = 1;
463  if ((ret = av_frame_ref(data, s->frame)) < 0)
464  return ret;
465  return buf_size;
466 }
467 
469 {
470  AnsiContext *s = avctx->priv_data;
471 
472  av_frame_free(&s->frame);
473  return 0;
474 }
475 
477  .name = "ansi",
478  .long_name = NULL_IF_CONFIG_SMALL("ASCII/ANSI art"),
479  .type = AVMEDIA_TYPE_VIDEO,
480  .id = AV_CODEC_ID_ANSI,
481  .priv_data_size = sizeof(AnsiContext),
482  .init = decode_init,
483  .close = decode_close,
484  .decode = decode_frame,
485  .capabilities = AV_CODEC_CAP_DR1,
486  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
487 };
static void draw_char(AVCodecContext *avctx, int c)
Draw character to screen.
Definition: ansi.c:161
#define FONT_WIDTH
Font width.
Definition: ansi.c:46
const char * s
Definition: avisynth_c.h:768
int x
x cursor position (pixels)
Definition: ansi.c:55
#define ATTR_REVERSE
Reverse (mode 7)
Definition: ansi.c:39
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
int bg
background color
Definition: ansi.c:63
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
#define ATTR_CONCEALED
Concealed (mode 8)
Definition: ansi.c:40
#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:194
const char * g
Definition: vf_curves.c:112
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int nb_args
number of arguments (may exceed MAX_NB_ARGS)
Definition: ansi.c:75
int size
Definition: avcodec.h:1400
const char * b
Definition: vf_curves.c:113
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1690
const uint8_t avpriv_vga16_font[4096]
#define DEFAULT_SCREEN_MODE
80x25
Definition: ansi.c:44
AVCodec.
Definition: avcodec.h:3289
static void erase_screen(AVCodecContext *avctx)
Definition: ansi.c:149
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...
Definition: decode.c:1805
static int execute_code(AVCodecContext *avctx, int c)
Execute ANSI escape code.
Definition: ansi.c:188
static void hscroll(AVCodecContext *avctx)
Definition: ansi.c:120
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
#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:82
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:150
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
#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:400
#define height
uint8_t * data
Definition: avcodec.h:1399
CGA/EGA/VGA ROM data.
#define DEFAULT_BG_COLOR
Definition: ansi.c:43
static av_cold int decode_close(AVCodecContext *avctx)
Definition: ansi.c:468
#define av_log(a,...)
const uint8_t * font
font
Definition: ansi.c:59
#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:58
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:163
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:190
const char * r
Definition: vf_curves.c:111
uint16_t width
Definition: gdv.c:47
static void erase_line(AVCodecContext *avctx, int xoffset, int xlength)
Definition: ansi.c:140
const char * name
Name of the codec implementation.
Definition: avcodec.h:3296
GLsizei count
Definition: opengl_enc.c:109
#define FFMAX(a, b)
Definition: common.h:94
reference-counted frame API
#define ATTR_BLINK
Blink/Bright-background (mode 5)
Definition: ansi.c:38
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:284
#define FFMIN(a, b)
Definition: common.h:96
int width
picture width / height.
Definition: avcodec.h:1653
static av_cold int decode_init(AVCodecContext *avctx)
Definition: ansi.c:78
#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:60
int args[MAX_NB_ARGS]
Definition: ansi.c:74
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:232
main external API structure.
Definition: avcodec.h:1481
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1756
void * buf
Definition: avisynth_c.h:690
int index
Definition: gxfenc.c:89
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:358
int fg
foreground color
Definition: ansi.c:62
static const uint8_t ansi_to_cga[16]
map ansi color index to cga palette index
Definition: ansi.c:49
#define GRAY(x)
static void set_palette(uint32_t *pal)
Definition: ansi.c:105
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:510
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
int sx
saved x cursor position (pixels)
Definition: ansi.c:57
common internal api header.
common internal and external API header
static double c[64]
AVFrame * frame
Definition: ansi.c:54
enum AnsiContext::@49 state
int y
y cursor position (pixels)
Definition: ansi.c:56
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: ansi.c:355
int first_frame
Definition: ansi.c:64
void * priv_data
Definition: avcodec.h:1508
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:2167
#define MAX_NB_ARGS
Definition: ansi.c:73
#define DEFAULT_FG_COLOR
CGA color index.
Definition: ansi.c:42
#define FFSWAP(type, a, b)
Definition: common.h:99
int attributes
attribute flags
Definition: ansi.c:61
This structure stores compressed data.
Definition: avcodec.h:1376
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:1117
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:955
CGA/EGA/VGA ROM font data.
AVCodec ff_ansi_decoder
Definition: ansi.c:476
#define COLOR(x)