FFmpeg
dvdsubenc.c
Go to the documentation of this file.
1 /*
2  * DVD subtitle encoding
3  * Copyright (c) 2005 Wolfram Gloger
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 #include "avcodec.h"
22 #include "bytestream.h"
23 #include "internal.h"
24 #include "libavutil/avassert.h"
25 #include "libavutil/bprint.h"
26 #include "libavutil/imgutils.h"
27 #include "libavutil/opt.h"
28 
29 typedef struct {
30  AVClass *class;
31  uint32_t global_palette[16];
32  char *palette_str;
35 
36 // ncnt is the nibble counter
37 #define PUTNIBBLE(val)\
38 do {\
39  if (ncnt++ & 1)\
40  *q++ = bitbuf | ((val) & 0x0f);\
41  else\
42  bitbuf = (val) << 4;\
43 } while(0)
44 
45 static void dvd_encode_rle(uint8_t **pq,
46  const uint8_t *bitmap, int linesize,
47  int w, int h,
48  const int cmap[256])
49 {
50  uint8_t *q;
51  unsigned int bitbuf = 0;
52  int ncnt;
53  int x, y, len, color;
54 
55  q = *pq;
56 
57  for (y = 0; y < h; ++y) {
58  ncnt = 0;
59  for(x = 0; x < w; x += len) {
60  color = bitmap[x];
61  for (len=1; x+len < w; ++len)
62  if (bitmap[x+len] != color)
63  break;
64  color = cmap[color];
65  av_assert0(color < 4);
66  if (len < 0x04) {
67  PUTNIBBLE((len << 2)|color);
68  } else if (len < 0x10) {
69  PUTNIBBLE(len >> 2);
70  PUTNIBBLE((len << 2)|color);
71  } else if (len < 0x40) {
72  PUTNIBBLE(0);
73  PUTNIBBLE(len >> 2);
74  PUTNIBBLE((len << 2)|color);
75  } else if (x+len == w) {
76  PUTNIBBLE(0);
77  PUTNIBBLE(0);
78  PUTNIBBLE(0);
80  } else {
81  if (len > 0xff)
82  len = 0xff;
83  PUTNIBBLE(0);
84  PUTNIBBLE(len >> 6);
85  PUTNIBBLE(len >> 2);
86  PUTNIBBLE((len << 2)|color);
87  }
88  }
89  /* end of line */
90  if (ncnt & 1)
91  PUTNIBBLE(0);
92  bitmap += linesize;
93  }
94 
95  *pq = q;
96 }
97 
98 static int color_distance(uint32_t a, uint32_t b)
99 {
100  int r = 0, d, i;
101  int alpha_a = 8, alpha_b = 8;
102 
103  for (i = 24; i >= 0; i -= 8) {
104  d = alpha_a * (int)((a >> i) & 0xFF) -
105  alpha_b * (int)((b >> i) & 0xFF);
106  r += d * d;
107  alpha_a = a >> 28;
108  alpha_b = b >> 28;
109  }
110  return r;
111 }
112 
113 /**
114  * Count colors used in a rectangle, quantizing alpha and grouping by
115  * nearest global palette entry.
116  */
117 static void count_colors(AVCodecContext *avctx, unsigned hits[33],
118  const AVSubtitleRect *r)
119 {
120  DVDSubtitleContext *dvdc = avctx->priv_data;
121  unsigned count[256] = { 0 };
122  uint32_t *palette = (uint32_t *)r->data[1];
123  uint32_t color;
124  int x, y, i, j, match, d, best_d, av_uninit(best_j);
125  uint8_t *p = r->data[0];
126 
127  for (y = 0; y < r->h; y++) {
128  for (x = 0; x < r->w; x++)
129  count[*(p++)]++;
130  p += r->linesize[0] - r->w;
131  }
132  for (i = 0; i < 256; i++) {
133  if (!count[i]) /* avoid useless search */
134  continue;
135  color = palette[i];
136  /* 0: transparent, 1-16: semi-transparent, 17-33 opaque */
137  match = color < 0x33000000 ? 0 : color < 0xCC000000 ? 1 : 17;
138  if (match) {
139  best_d = INT_MAX;
140  for (j = 0; j < 16; j++) {
141  d = color_distance(0xFF000000 | color,
142  0xFF000000 | dvdc->global_palette[j]);
143  if (d < best_d) {
144  best_d = d;
145  best_j = j;
146  }
147  }
148  match += best_j;
149  }
150  hits[match] += count[i];
151  }
152 }
153 
154 static void select_palette(AVCodecContext *avctx, int out_palette[4],
155  int out_alpha[4], unsigned hits[33])
156 {
157  DVDSubtitleContext *dvdc = avctx->priv_data;
158  int i, j, bright, mult;
159  uint32_t color;
160  int selected[4] = { 0 };
161  uint32_t pseudopal[33] = { 0 };
162  uint32_t refcolor[3] = { 0x00000000, 0xFFFFFFFF, 0xFF000000 };
163 
164  /* Bonus for transparent: if the rectangle fits tightly the text, the
165  background color can be quite rare, but it would be ugly without it */
166  hits[0] *= 16;
167  /* Bonus for bright colors */
168  for (i = 0; i < 16; i++) {
169  if (!(hits[1 + i] + hits[17 + i]))
170  continue; /* skip unused colors to gain time */
171  color = dvdc->global_palette[i];
172  bright = 0;
173  for (j = 0; j < 3; j++, color >>= 8)
174  bright += (color & 0xFF) < 0x40 || (color & 0xFF) >= 0xC0;
175  mult = 2 + FFMIN(bright, 2);
176  hits[ 1 + i] *= mult;
177  hits[17 + i] *= mult;
178  }
179 
180  /* Select four most frequent colors */
181  for (i = 0; i < 4; i++) {
182  for (j = 0; j < 33; j++)
183  if (hits[j] > hits[selected[i]])
184  selected[i] = j;
185  hits[selected[i]] = 0;
186  }
187 
188  /* Order the colors like in most DVDs:
189  0: background, 1: foreground, 2: outline */
190  for (i = 0; i < 16; i++) {
191  pseudopal[ 1 + i] = 0x80000000 | dvdc->global_palette[i];
192  pseudopal[17 + i] = 0xFF000000 | dvdc->global_palette[i];
193  }
194  for (i = 0; i < 3; i++) {
195  int best_d = color_distance(refcolor[i], pseudopal[selected[i]]);
196  for (j = i + 1; j < 4; j++) {
197  int d = color_distance(refcolor[i], pseudopal[selected[j]]);
198  if (d < best_d) {
199  FFSWAP(int, selected[i], selected[j]);
200  best_d = d;
201  }
202  }
203  }
204 
205  /* Output */
206  for (i = 0; i < 4; i++) {
207  out_palette[i] = selected[i] ? (selected[i] - 1) & 0xF : 0;
208  out_alpha [i] = !selected[i] ? 0 : selected[i] < 17 ? 0x80 : 0xFF;
209  }
210 }
211 
212 static void build_color_map(AVCodecContext *avctx, int cmap[],
213  const uint32_t palette[],
214  const int out_palette[], unsigned int const out_alpha[])
215 {
216  DVDSubtitleContext *dvdc = avctx->priv_data;
217  int i, j, d, best_d;
218  uint32_t pseudopal[4];
219 
220  for (i = 0; i < 4; i++)
221  pseudopal[i] = (out_alpha[i] << 24) |
222  dvdc->global_palette[out_palette[i]];
223  for (i = 0; i < 256; i++) {
224  best_d = INT_MAX;
225  for (j = 0; j < 4; j++) {
226  d = color_distance(pseudopal[j], palette[i]);
227  if (d < best_d) {
228  cmap[i] = j;
229  best_d = d;
230  }
231  }
232  }
233 }
234 
235 static void copy_rectangle(AVSubtitleRect *dst, AVSubtitleRect *src, int cmap[])
236 {
237  int x, y;
238  uint8_t *p, *q;
239 
240  p = src->data[0];
241  q = dst->data[0] + (src->x - dst->x) +
242  (src->y - dst->y) * dst->linesize[0];
243  for (y = 0; y < src->h; y++) {
244  for (x = 0; x < src->w; x++)
245  *(q++) = cmap[*(p++)];
246  p += src->linesize[0] - src->w;
247  q += dst->linesize[0] - src->w;
248  }
249 }
250 
252  uint8_t *outbuf, int outbuf_size,
253  const AVSubtitle *h)
254 {
255  DVDSubtitleContext *dvdc = avctx->priv_data;
256  uint8_t *q, *qq;
257  int offset1, offset2;
258  int i, rects = h->num_rects, ret;
259  unsigned global_palette_hits[33] = { 0 };
260  int cmap[256];
261  int out_palette[4];
262  int out_alpha[4];
263  AVSubtitleRect vrect;
264  uint8_t *vrect_data = NULL;
265  int x2, y2;
266  int forced = 0;
267 
268  if (rects == 0 || !h->rects)
269  return AVERROR(EINVAL);
270  for (i = 0; i < rects; i++)
271  if (h->rects[i]->type != SUBTITLE_BITMAP) {
272  av_log(avctx, AV_LOG_ERROR, "Bitmap subtitle required\n");
273  return AVERROR(EINVAL);
274  }
275  /* Mark this subtitle forced if any of the rectangles is forced. */
276  for (i = 0; i < rects; i++)
277  if ((h->rects[i]->flags & AV_SUBTITLE_FLAG_FORCED) != 0) {
278  forced = 1;
279  break;
280  }
281 
282 #if FF_API_AVPICTURE
284  for (i = 0; i < rects; i++)
285  if (!h->rects[i]->data[0]) {
286  AVSubtitleRect *rect = h->rects[i];
287  int j;
288  for (j = 0; j < 4; j++) {
289  rect->data[j] = rect->pict.data[j];
290  rect->linesize[j] = rect->pict.linesize[j];
291  }
292  }
294 #endif
295 
296  vrect = *h->rects[0];
297 
298  if (rects > 1) {
299  /* DVD subtitles can have only one rectangle: build a virtual
300  rectangle containing all actual rectangles.
301  The data of the rectangles will be copied later, when the palette
302  is decided, because the rectangles may have different palettes. */
303  int xmin = h->rects[0]->x, xmax = xmin + h->rects[0]->w;
304  int ymin = h->rects[0]->y, ymax = ymin + h->rects[0]->h;
305  for (i = 1; i < rects; i++) {
306  xmin = FFMIN(xmin, h->rects[i]->x);
307  ymin = FFMIN(ymin, h->rects[i]->y);
308  xmax = FFMAX(xmax, h->rects[i]->x + h->rects[i]->w);
309  ymax = FFMAX(ymax, h->rects[i]->y + h->rects[i]->h);
310  }
311  vrect.x = xmin;
312  vrect.y = ymin;
313  vrect.w = xmax - xmin;
314  vrect.h = ymax - ymin;
315  if ((ret = av_image_check_size(vrect.w, vrect.h, 0, avctx)) < 0)
316  return ret;
317 
318  /* Count pixels outside the virtual rectangle as transparent */
319  global_palette_hits[0] = vrect.w * vrect.h;
320  for (i = 0; i < rects; i++)
321  global_palette_hits[0] -= h->rects[i]->w * h->rects[i]->h;
322  }
323 
324  for (i = 0; i < rects; i++)
325  count_colors(avctx, global_palette_hits, h->rects[i]);
326  select_palette(avctx, out_palette, out_alpha, global_palette_hits);
327 
328  if (rects > 1) {
329  if (!(vrect_data = av_calloc(vrect.w, vrect.h)))
330  return AVERROR(ENOMEM);
331  vrect.data [0] = vrect_data;
332  vrect.linesize[0] = vrect.w;
333  for (i = 0; i < rects; i++) {
334  build_color_map(avctx, cmap, (uint32_t *)h->rects[i]->data[1],
335  out_palette, out_alpha);
336  copy_rectangle(&vrect, h->rects[i], cmap);
337  }
338  for (i = 0; i < 4; i++)
339  cmap[i] = i;
340  } else {
341  build_color_map(avctx, cmap, (uint32_t *)h->rects[0]->data[1],
342  out_palette, out_alpha);
343  }
344 
345  av_log(avctx, AV_LOG_DEBUG, "Selected palette:");
346  for (i = 0; i < 4; i++)
347  av_log(avctx, AV_LOG_DEBUG, " 0x%06"PRIx32"@@%02x (0x%x,0x%x)",
348  dvdc->global_palette[out_palette[i]], out_alpha[i],
349  out_palette[i], out_alpha[i] >> 4);
350  av_log(avctx, AV_LOG_DEBUG, "\n");
351 
352  // encode data block
353  q = outbuf + 4;
354  offset1 = q - outbuf;
355  // worst case memory requirement: 1 nibble per pixel..
356  if ((q - outbuf) + vrect.w * vrect.h / 2 + 17 + 21 > outbuf_size) {
357  av_log(NULL, AV_LOG_ERROR, "dvd_subtitle too big\n");
359  goto fail;
360  }
361  dvd_encode_rle(&q, vrect.data[0], vrect.w * 2,
362  vrect.w, (vrect.h + 1) >> 1, cmap);
363  offset2 = q - outbuf;
364  dvd_encode_rle(&q, vrect.data[0] + vrect.w, vrect.w * 2,
365  vrect.w, vrect.h >> 1, cmap);
366 
367  if (dvdc->even_rows_fix && (vrect.h & 1)) {
368  // Work-around for some players that want the height to be even.
369  vrect.h++;
370  *q++ = 0x00; // 0x00 0x00 == empty row, i.e. fully transparent
371  *q++ = 0x00;
372  }
373 
374  // set data packet size
375  qq = outbuf + 2;
376  bytestream_put_be16(&qq, q - outbuf);
377 
378  // send start display command
379  bytestream_put_be16(&q, (h->start_display_time*90) >> 10);
380  bytestream_put_be16(&q, (q - outbuf) /*- 2 */ + 8 + 12 + 2);
381  *q++ = 0x03; // palette - 4 nibbles
382  *q++ = (out_palette[3] << 4) | out_palette[2];
383  *q++ = (out_palette[1] << 4) | out_palette[0];
384  *q++ = 0x04; // alpha - 4 nibbles
385  *q++ = (out_alpha[3] & 0xF0) | (out_alpha[2] >> 4);
386  *q++ = (out_alpha[1] & 0xF0) | (out_alpha[0] >> 4);
387 
388  // 12 bytes per rect
389  x2 = vrect.x + vrect.w - 1;
390  y2 = vrect.y + vrect.h - 1;
391 
392  *q++ = 0x05;
393  // x1 x2 -> 6 nibbles
394  *q++ = vrect.x >> 4;
395  *q++ = (vrect.x << 4) | ((x2 >> 8) & 0xf);
396  *q++ = x2;
397  // y1 y2 -> 6 nibbles
398  *q++ = vrect.y >> 4;
399  *q++ = (vrect.y << 4) | ((y2 >> 8) & 0xf);
400  *q++ = y2;
401 
402  *q++ = 0x06;
403  // offset1, offset2
404  bytestream_put_be16(&q, offset1);
405  bytestream_put_be16(&q, offset2);
406 
407  *q++ = forced ? 0x00 : 0x01; // start command
408  *q++ = 0xff; // terminating command
409 
410  // send stop display command last
411  bytestream_put_be16(&q, (h->end_display_time*90) >> 10);
412  bytestream_put_be16(&q, (q - outbuf) - 2 /*+ 4*/);
413  *q++ = 0x02; // set end
414  *q++ = 0xff; // terminating command
415 
416  qq = outbuf;
417  bytestream_put_be16(&qq, q - outbuf);
418 
419  av_log(NULL, AV_LOG_DEBUG, "subtitle_packet size=%"PTRDIFF_SPECIFIER"\n", q - outbuf);
420  ret = q - outbuf;
421 
422 fail:
423  av_free(vrect_data);
424  return ret;
425 }
426 
427 static int bprint_to_extradata(AVCodecContext *avctx, struct AVBPrint *buf)
428 {
429  int ret;
430  char *str;
431 
432  ret = av_bprint_finalize(buf, &str);
433  if (ret < 0)
434  return ret;
435  if (!av_bprint_is_complete(buf)) {
436  av_free(str);
437  return AVERROR(ENOMEM);
438  }
439 
440  avctx->extradata = str;
441  /* Note: the string is NUL terminated (so extradata can be read as a
442  * string), but the ending character is not accounted in the size (in
443  * binary formats you are likely not supposed to mux that character). When
444  * extradata is copied, it is also padded with AV_INPUT_BUFFER_PADDING_SIZE
445  * zeros. */
446  avctx->extradata_size = buf->len;
447  return 0;
448 }
449 
450 static int dvdsub_init(AVCodecContext *avctx)
451 {
452  DVDSubtitleContext *dvdc = avctx->priv_data;
453  static const uint32_t default_palette[16] = {
454  0x000000, 0x0000FF, 0x00FF00, 0xFF0000,
455  0xFFFF00, 0xFF00FF, 0x00FFFF, 0xFFFFFF,
456  0x808000, 0x8080FF, 0x800080, 0x80FF80,
457  0x008080, 0xFF8080, 0x555555, 0xAAAAAA,
458  };
459  AVBPrint extradata;
460  int i, ret;
461 
462  av_assert0(sizeof(dvdc->global_palette) == sizeof(default_palette));
463  if (dvdc->palette_str) {
465  } else {
466  memcpy(dvdc->global_palette, default_palette, sizeof(dvdc->global_palette));
467  }
468 
470  if (avctx->width && avctx->height)
471  av_bprintf(&extradata, "size: %dx%d\n", avctx->width, avctx->height);
472  av_bprintf(&extradata, "palette:");
473  for (i = 0; i < 16; i++)
474  av_bprintf(&extradata, " %06"PRIx32"%c",
475  dvdc->global_palette[i] & 0xFFFFFF, i < 15 ? ',' : '\n');
476 
477  ret = bprint_to_extradata(avctx, &extradata);
478  if (ret < 0)
479  return ret;
480 
481  return 0;
482 }
483 
484 static int dvdsub_encode(AVCodecContext *avctx,
485  unsigned char *buf, int buf_size,
486  const AVSubtitle *sub)
487 {
488  //DVDSubtitleContext *s = avctx->priv_data;
489  int ret;
490 
491  ret = encode_dvd_subtitles(avctx, buf, buf_size, sub);
492  return ret;
493 }
494 
495 #define OFFSET(x) offsetof(DVDSubtitleContext, x)
496 #define SE AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_ENCODING_PARAM
497 static const AVOption options[] = {
498  {"palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SE },
499  {"even_rows_fix", "Make number of rows even (workaround for some players)", OFFSET(even_rows_fix), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, SE},
500  { NULL },
501 };
502 
503 static const AVClass dvdsubenc_class = {
504  .class_name = "VOBSUB subtitle encoder",
505  .item_name = av_default_item_name,
506  .option = options,
507  .version = LIBAVUTIL_VERSION_INT,
508 };
509 
511  .name = "dvdsub",
512  .long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
513  .type = AVMEDIA_TYPE_SUBTITLE,
515  .init = dvdsub_init,
516  .encode_sub = dvdsub_encode,
517  .priv_class = &dvdsubenc_class,
518  .priv_data_size = sizeof(DVDSubtitleContext),
519 };
AVSubtitle
Definition: avcodec.h:2722
options
static const AVOption options[]
Definition: dvdsubenc.c:497
AVCodec
AVCodec.
Definition: codec.h:197
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
AVMEDIA_TYPE_SUBTITLE
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
r
const char * r
Definition: vf_curves.c:116
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
dvdsubenc_class
static const AVClass dvdsubenc_class
Definition: dvdsubenc.c:503
copy_rectangle
static void copy_rectangle(AVSubtitleRect *dst, AVSubtitleRect *src, int cmap[])
Definition: dvdsubenc.c:235
av_bprint_finalize
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
FFSWAP
#define FFSWAP(type, a, b)
Definition: common.h:108
color
Definition: vf_paletteuse.c:583
av_bprint_init
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
sub
static float sub(float src0, float src1)
Definition: dnn_backend_native_layer_mathbinary.c:32
rect
Definition: f_ebur128.c:91
ff_dvdsub_parse_palette
void ff_dvdsub_parse_palette(uint32_t *palette, const char *p)
Definition: dvdsub.c:26
AVSubtitleRect
Definition: avcodec.h:2687
w
uint8_t w
Definition: llviddspenc.c:39
internal.h
AVOption
AVOption.
Definition: opt.h:248
b
#define b
Definition: input.c:41
DVDSubtitleContext::global_palette
uint32_t global_palette[16]
Definition: dvdsubenc.c:31
AVSubtitleRect::linesize
int linesize[4]
Definition: avcodec.h:2706
count_colors
static void count_colors(AVCodecContext *avctx, unsigned hits[33], const AVSubtitleRect *r)
Count colors used in a rectangle, quantizing alpha and grouping by nearest global palette entry.
Definition: dvdsubenc.c:117
PUTNIBBLE
#define PUTNIBBLE(val)
Definition: dvdsubenc.c:37
fail
#define fail()
Definition: checkasm.h:133
select_palette
static void select_palette(AVCodecContext *avctx, int out_palette[4], int out_alpha[4], unsigned hits[33])
Definition: dvdsubenc.c:154
AVSubtitleRect::x
int x
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:2688
AV_BPRINT_SIZE_AUTOMATIC
#define AV_BPRINT_SIZE_AUTOMATIC
AVERROR_BUFFER_TOO_SMALL
#define AVERROR_BUFFER_TOO_SMALL
Buffer too small.
Definition: error.h:51
bprint_to_extradata
static int bprint_to_extradata(AVCodecContext *avctx, struct AVBPrint *buf)
Definition: dvdsubenc.c:427
mult
static int16_t mult(Float11 *f1, Float11 *f2)
Definition: g726.c:55
avassert.h
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
encode_dvd_subtitles
static int encode_dvd_subtitles(AVCodecContext *avctx, uint8_t *outbuf, int outbuf_size, const AVSubtitle *h)
Definition: dvdsubenc.c:251
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:638
AVSubtitleRect::y
int y
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:2689
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
DVDSubtitleContext::palette_str
char * palette_str
Definition: dvdsubenc.c:32
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
PTRDIFF_SPECIFIER
#define PTRDIFF_SPECIFIER
Definition: internal.h:192
NULL
#define NULL
Definition: coverity.c:32
AV_CODEC_ID_DVD_SUBTITLE
@ AV_CODEC_ID_DVD_SUBTITLE
Definition: codec_id.h:523
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
AVSubtitleRect::data
uint8_t * data[4]
data+linesize for the bitmap of this subtitle.
Definition: avcodec.h:2705
src
#define src
Definition: vp8dsp.c:255
dvdsub_encode
static int dvdsub_encode(AVCodecContext *avctx, unsigned char *buf, int buf_size, const AVSubtitle *sub)
Definition: dvdsubenc.c:484
av_bprint_is_complete
static int av_bprint_is_complete(const AVBPrint *buf)
Test if the print buffer is complete (not truncated).
Definition: bprint.h:185
DVDSubtitleContext
Definition: dvdsubenc.c:29
build_color_map
static void build_color_map(AVCodecContext *avctx, int cmap[], const uint32_t palette[], const int out_palette[], unsigned int const out_alpha[])
Definition: dvdsubenc.c:212
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
FFMAX
#define FFMAX(a, b)
Definition: common.h:103
color
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
Definition: log.c:92
FFMIN
#define FFMIN(a, b)
Definition: common.h:105
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
AV_SUBTITLE_FLAG_FORCED
#define AV_SUBTITLE_FLAG_FORCED
Definition: avcodec.h:2685
SUBTITLE_BITMAP
@ SUBTITLE_BITMAP
A bitmap, pict will be set.
Definition: avcodec.h:2670
bprint.h
i
int i
Definition: input.c:407
dvd_encode_rle
static void dvd_encode_rle(uint8_t **pq, const uint8_t *bitmap, int linesize, int w, int h, const int cmap[256])
Definition: dvdsubenc.c:45
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:637
color_distance
static int color_distance(uint32_t a, uint32_t b)
Definition: dvdsubenc.c:98
SE
#define SE
Definition: dvdsubenc.c:496
uint8_t
uint8_t
Definition: audio_convert.c:194
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
len
int len
Definition: vorbis_enc_data.h:452
AVCodecContext::height
int height
Definition: avcodec.h:709
ff_dvdsub_encoder
AVCodec ff_dvdsub_encoder
Definition: dvdsubenc.c:510
avcodec.h
av_uninit
#define av_uninit(x)
Definition: attributes.h:154
ret
ret
Definition: filter_design.txt:187
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
av_bprintf
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
AVCodecContext
main external API structure.
Definition: avcodec.h:536
dvdsub_init
static int dvdsub_init(AVCodecContext *avctx)
Definition: dvdsubenc.c:450
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
Definition: mem.c:245
FF_DISABLE_DEPRECATION_WARNINGS
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:83
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:563
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:242
DVDSubtitleContext::even_rows_fix
int even_rows_fix
Definition: dvdsubenc.c:33
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:709
bytestream.h
convert_header.str
string str
Definition: convert_header.py:20
imgutils.h
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
h
h
Definition: vp9dsp_template.c:2038
av_image_check_size
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:317
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
OFFSET
#define OFFSET(x)
Definition: dvdsubenc.c:495
int
int
Definition: ffmpeg_filter.c:170