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vf_palettegen.c
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1 /*
2  * Copyright (c) 2015 Stupeflix
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * Generate one palette for a whole video stream.
24  */
25 
26 #include "libavutil/avassert.h"
27 #include "libavutil/internal.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/qsort.h"
30 #include "avfilter.h"
31 #include "internal.h"
32 
33 /* Reference a color and how much it's used */
34 struct color_ref {
35  uint32_t color;
36  uint64_t count;
37 };
38 
39 /* Store a range of colors */
40 struct range_box {
41  uint32_t color; // average color
42  int64_t variance; // overall variance of the box (how much the colors are spread)
43  int start; // index in PaletteGenContext->refs
44  int len; // number of referenced colors
45  int sorted_by; // whether range of colors is sorted by red (0), green (1) or blue (2)
46 };
47 
48 struct hist_node {
49  struct color_ref *entries;
51 };
52 
53 enum {
58 };
59 
60 #define NBITS 5
61 #define HIST_SIZE (1<<(3*NBITS))
62 
63 typedef struct {
64  const AVClass *class;
65 
69 
70  AVFrame *prev_frame; // previous frame used for the diff stats_mode
71  struct hist_node histogram[HIST_SIZE]; // histogram/hashtable of the colors
72  struct color_ref **refs; // references of all the colors used in the stream
73  int nb_refs; // number of color references (or number of different colors)
74  struct range_box boxes[256]; // define the segmentation of the colorspace (the final palette)
75  int nb_boxes; // number of boxes (increase will segmenting them)
76  int palette_pushed; // if the palette frame is pushed into the outlink or not
78 
79 #define OFFSET(x) offsetof(PaletteGenContext, x)
80 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
81 static const AVOption palettegen_options[] = {
82  { "max_colors", "set the maximum number of colors to use in the palette", OFFSET(max_colors), AV_OPT_TYPE_INT, {.i64=256}, 4, 256, FLAGS },
83  { "reserve_transparent", "reserve a palette entry for transparency", OFFSET(reserve_transparent), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
84  { "stats_mode", "set statistics mode", OFFSET(stats_mode), AV_OPT_TYPE_INT, {.i64=STATS_MODE_ALL_FRAMES}, 0, NB_STATS_MODE-1, FLAGS, "mode" },
85  { "full", "compute full frame histograms", 0, AV_OPT_TYPE_CONST, {.i64=STATS_MODE_ALL_FRAMES}, INT_MIN, INT_MAX, FLAGS, "mode" },
86  { "diff", "compute histograms only for the part that differs from previous frame", 0, AV_OPT_TYPE_CONST, {.i64=STATS_MODE_DIFF_FRAMES}, INT_MIN, INT_MAX, FLAGS, "mode" },
87  { "single", "compute new histogram for each frame", 0, AV_OPT_TYPE_CONST, {.i64=STATS_MODE_SINGLE_FRAMES}, INT_MIN, INT_MAX, FLAGS, "mode" },
88  { NULL }
89 };
90 
91 AVFILTER_DEFINE_CLASS(palettegen);
92 
94 {
95  static const enum AVPixelFormat in_fmts[] = {AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE};
96  static const enum AVPixelFormat out_fmts[] = {AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE};
97  int ret;
100  if (!in || !out) {
101  av_freep(&in);
102  av_freep(&out);
103  return AVERROR(ENOMEM);
104  }
105  if ((ret = ff_formats_ref(in , &ctx->inputs[0]->out_formats)) < 0 ||
106  (ret = ff_formats_ref(out, &ctx->outputs[0]->in_formats)) < 0)
107  return ret;
108  return 0;
109 }
110 
111 typedef int (*cmp_func)(const void *, const void *);
112 
113 #define DECLARE_CMP_FUNC(name, pos) \
114 static int cmp_##name(const void *pa, const void *pb) \
115 { \
116  const struct color_ref * const *a = pa; \
117  const struct color_ref * const *b = pb; \
118  return ((*a)->color >> (8 * (2 - (pos))) & 0xff) \
119  - ((*b)->color >> (8 * (2 - (pos))) & 0xff); \
120 }
121 
125 
126 static const cmp_func cmp_funcs[] = {cmp_r, cmp_g, cmp_b};
127 
128 /**
129  * Simple color comparison for sorting the final palette
130  */
131 static int cmp_color(const void *a, const void *b)
132 {
133  const struct range_box *box1 = a;
134  const struct range_box *box2 = b;
135  return FFDIFFSIGN(box1->color , box2->color);
136 }
137 
138 static av_always_inline int diff(const uint32_t a, const uint32_t b)
139 {
140  const uint8_t c1[] = {a >> 16 & 0xff, a >> 8 & 0xff, a & 0xff};
141  const uint8_t c2[] = {b >> 16 & 0xff, b >> 8 & 0xff, b & 0xff};
142  const int dr = c1[0] - c2[0];
143  const int dg = c1[1] - c2[1];
144  const int db = c1[2] - c2[2];
145  return dr*dr + dg*dg + db*db;
146 }
147 
148 /**
149  * Find the next box to split: pick the one with the highest variance
150  */
152 {
153  int box_id, i, best_box_id = -1;
154  int64_t max_variance = -1;
155 
156  if (s->nb_boxes == s->max_colors - s->reserve_transparent)
157  return -1;
158 
159  for (box_id = 0; box_id < s->nb_boxes; box_id++) {
160  struct range_box *box = &s->boxes[box_id];
161 
162  if (s->boxes[box_id].len >= 2) {
163 
164  if (box->variance == -1) {
165  int64_t variance = 0;
166 
167  for (i = 0; i < box->len; i++) {
168  const struct color_ref *ref = s->refs[box->start + i];
169  variance += diff(ref->color, box->color) * ref->count;
170  }
171  box->variance = variance;
172  }
173  if (box->variance > max_variance) {
174  best_box_id = box_id;
175  max_variance = box->variance;
176  }
177  } else {
178  box->variance = -1;
179  }
180  }
181  return best_box_id;
182 }
183 
184 /**
185  * Get the 32-bit average color for the range of RGB colors enclosed in the
186  * specified box. Takes into account the weight of each color.
187  */
188 static uint32_t get_avg_color(struct color_ref * const *refs,
189  const struct range_box *box)
190 {
191  int i;
192  const int n = box->len;
193  uint64_t r = 0, g = 0, b = 0, div = 0;
194 
195  for (i = 0; i < n; i++) {
196  const struct color_ref *ref = refs[box->start + i];
197  r += (ref->color >> 16 & 0xff) * ref->count;
198  g += (ref->color >> 8 & 0xff) * ref->count;
199  b += (ref->color & 0xff) * ref->count;
200  div += ref->count;
201  }
202 
203  r = r / div;
204  g = g / div;
205  b = b / div;
206 
207  return 0xffU<<24 | r<<16 | g<<8 | b;
208 }
209 
210 /**
211  * Split given box in two at position n. The original box becomes the left part
212  * of the split, and the new index box is the right part.
213  */
214 static void split_box(PaletteGenContext *s, struct range_box *box, int n)
215 {
216  struct range_box *new_box = &s->boxes[s->nb_boxes++];
217  new_box->start = n + 1;
218  new_box->len = box->start + box->len - new_box->start;
219  new_box->sorted_by = box->sorted_by;
220  box->len -= new_box->len;
221 
222  av_assert0(box->len >= 1);
223  av_assert0(new_box->len >= 1);
224 
225  box->color = get_avg_color(s->refs, box);
226  new_box->color = get_avg_color(s->refs, new_box);
227  box->variance = -1;
228  new_box->variance = -1;
229 }
230 
231 /**
232  * Write the palette into the output frame.
233  */
235 {
236  const PaletteGenContext *s = ctx->priv;
237  int x, y, box_id = 0;
238  uint32_t *pal = (uint32_t *)out->data[0];
239  const int pal_linesize = out->linesize[0] >> 2;
240  uint32_t last_color = 0;
241 
242  for (y = 0; y < out->height; y++) {
243  for (x = 0; x < out->width; x++) {
244  if (box_id < s->nb_boxes) {
245  pal[x] = s->boxes[box_id++].color;
246  if ((x || y) && pal[x] == last_color)
247  av_log(ctx, AV_LOG_WARNING, "Dupped color: %08X\n", pal[x]);
248  last_color = pal[x];
249  } else {
250  pal[x] = 0xff000000; // pad with black
251  }
252  }
253  pal += pal_linesize;
254  }
255 
256  if (s->reserve_transparent) {
257  av_assert0(s->nb_boxes < 256);
258  pal[out->width - pal_linesize - 1] = 0x0000ff00; // add a green transparent color
259  }
260 }
261 
262 /**
263  * Crawl the histogram to get all the defined colors, and create a linear list
264  * of them (each color reference entry is a pointer to the value in the
265  * histogram/hash table).
266  */
267 static struct color_ref **load_color_refs(const struct hist_node *hist, int nb_refs)
268 {
269  int i, j, k = 0;
270  struct color_ref **refs = av_malloc_array(nb_refs, sizeof(*refs));
271 
272  if (!refs)
273  return NULL;
274 
275  for (j = 0; j < HIST_SIZE; j++) {
276  const struct hist_node *node = &hist[j];
277 
278  for (i = 0; i < node->nb_entries; i++)
279  refs[k++] = &node->entries[i];
280  }
281 
282  return refs;
283 }
284 
285 static double set_colorquant_ratio_meta(AVFrame *out, int nb_out, int nb_in)
286 {
287  char buf[32];
288  const double ratio = (double)nb_out / nb_in;
289  snprintf(buf, sizeof(buf), "%f", ratio);
290  av_dict_set(&out->metadata, "lavfi.color_quant_ratio", buf, 0);
291  return ratio;
292 }
293 
294 /**
295  * Main function implementing the Median Cut Algorithm defined by Paul Heckbert
296  * in Color Image Quantization for Frame Buffer Display (1982)
297  */
299 {
300  AVFrame *out;
301  PaletteGenContext *s = ctx->priv;
302  AVFilterLink *outlink = ctx->outputs[0];
303  double ratio;
304  int box_id = 0;
305  struct range_box *box;
306 
307  /* reference only the used colors from histogram */
308  s->refs = load_color_refs(s->histogram, s->nb_refs);
309  if (!s->refs) {
310  av_log(ctx, AV_LOG_ERROR, "Unable to allocate references for %d different colors\n", s->nb_refs);
311  return NULL;
312  }
313 
314  /* create the palette frame */
315  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
316  if (!out)
317  return NULL;
318  out->pts = 0;
319 
320  /* set first box for 0..nb_refs */
321  box = &s->boxes[box_id];
322  box->len = s->nb_refs;
323  box->sorted_by = -1;
324  box->color = get_avg_color(s->refs, box);
325  box->variance = -1;
326  s->nb_boxes = 1;
327 
328  while (box && box->len > 1) {
329  int i, rr, gr, br, longest;
330  uint64_t median, box_weight = 0;
331 
332  /* compute the box weight (sum all the weights of the colors in the
333  * range) and its boundings */
334  uint8_t min[3] = {0xff, 0xff, 0xff};
335  uint8_t max[3] = {0x00, 0x00, 0x00};
336  for (i = box->start; i < box->start + box->len; i++) {
337  const struct color_ref *ref = s->refs[i];
338  const uint32_t rgb = ref->color;
339  const uint8_t r = rgb >> 16 & 0xff, g = rgb >> 8 & 0xff, b = rgb & 0xff;
340  min[0] = FFMIN(r, min[0]), max[0] = FFMAX(r, max[0]);
341  min[1] = FFMIN(g, min[1]), max[1] = FFMAX(g, max[1]);
342  min[2] = FFMIN(b, min[2]), max[2] = FFMAX(b, max[2]);
343  box_weight += ref->count;
344  }
345 
346  /* define the axis to sort by according to the widest range of colors */
347  rr = max[0] - min[0];
348  gr = max[1] - min[1];
349  br = max[2] - min[2];
350  longest = 1; // pick green by default (the color the eye is the most sensitive to)
351  if (br >= rr && br >= gr) longest = 2;
352  if (rr >= gr && rr >= br) longest = 0;
353  if (gr >= rr && gr >= br) longest = 1; // prefer green again
354 
355  ff_dlog(ctx, "box #%02X [%6d..%-6d] (%6d) w:%-6"PRIu64" ranges:[%2x %2x %2x] sort by %c (already sorted:%c) ",
356  box_id, box->start, box->start + box->len - 1, box->len, box_weight,
357  rr, gr, br, "rgb"[longest], box->sorted_by == longest ? 'y':'n');
358 
359  /* sort the range by its longest axis if it's not already sorted */
360  if (box->sorted_by != longest) {
361  cmp_func cmpf = cmp_funcs[longest];
362  AV_QSORT(&s->refs[box->start], box->len, const struct color_ref *, cmpf);
363  box->sorted_by = longest;
364  }
365 
366  /* locate the median where to split */
367  median = (box_weight + 1) >> 1;
368  box_weight = 0;
369  /* if you have 2 boxes, the maximum is actually #0: you must have at
370  * least 1 color on each side of the split, hence the -2 */
371  for (i = box->start; i < box->start + box->len - 2; i++) {
372  box_weight += s->refs[i]->count;
373  if (box_weight > median)
374  break;
375  }
376  ff_dlog(ctx, "split @ i=%-6d with w=%-6"PRIu64" (target=%6"PRIu64")\n", i, box_weight, median);
377  split_box(s, box, i);
378 
379  box_id = get_next_box_id_to_split(s);
380  box = box_id >= 0 ? &s->boxes[box_id] : NULL;
381  }
382 
383  ratio = set_colorquant_ratio_meta(out, s->nb_boxes, s->nb_refs);
384  av_log(ctx, AV_LOG_INFO, "%d%s colors generated out of %d colors; ratio=%f\n",
385  s->nb_boxes, s->reserve_transparent ? "(+1)" : "", s->nb_refs, ratio);
386 
387  qsort(s->boxes, s->nb_boxes, sizeof(*s->boxes), cmp_color);
388 
389  write_palette(ctx, out);
390 
391  return out;
392 }
393 
394 /**
395  * Hashing function for the color.
396  * It keeps the NBITS least significant bit of each component to make it
397  * "random" even if the scene doesn't have much different colors.
398  */
399 static inline unsigned color_hash(uint32_t color)
400 {
401  const uint8_t r = color >> 16 & ((1<<NBITS)-1);
402  const uint8_t g = color >> 8 & ((1<<NBITS)-1);
403  const uint8_t b = color & ((1<<NBITS)-1);
404  return r<<(NBITS*2) | g<<NBITS | b;
405 }
406 
407 /**
408  * Locate the color in the hash table and increment its counter.
409  */
410 static int color_inc(struct hist_node *hist, uint32_t color)
411 {
412  int i;
413  const unsigned hash = color_hash(color);
414  struct hist_node *node = &hist[hash];
415  struct color_ref *e;
416 
417  for (i = 0; i < node->nb_entries; i++) {
418  e = &node->entries[i];
419  if (e->color == color) {
420  e->count++;
421  return 0;
422  }
423  }
424 
425  e = av_dynarray2_add((void**)&node->entries, &node->nb_entries,
426  sizeof(*node->entries), NULL);
427  if (!e)
428  return AVERROR(ENOMEM);
429  e->color = color;
430  e->count = 1;
431  return 1;
432 }
433 
434 /**
435  * Update histogram when pixels differ from previous frame.
436  */
437 static int update_histogram_diff(struct hist_node *hist,
438  const AVFrame *f1, const AVFrame *f2)
439 {
440  int x, y, ret, nb_diff_colors = 0;
441 
442  for (y = 0; y < f1->height; y++) {
443  const uint32_t *p = (const uint32_t *)(f1->data[0] + y*f1->linesize[0]);
444  const uint32_t *q = (const uint32_t *)(f2->data[0] + y*f2->linesize[0]);
445 
446  for (x = 0; x < f1->width; x++) {
447  if (p[x] == q[x])
448  continue;
449  ret = color_inc(hist, p[x]);
450  if (ret < 0)
451  return ret;
452  nb_diff_colors += ret;
453  }
454  }
455  return nb_diff_colors;
456 }
457 
458 /**
459  * Simple histogram of the frame.
460  */
461 static int update_histogram_frame(struct hist_node *hist, const AVFrame *f)
462 {
463  int x, y, ret, nb_diff_colors = 0;
464 
465  for (y = 0; y < f->height; y++) {
466  const uint32_t *p = (const uint32_t *)(f->data[0] + y*f->linesize[0]);
467 
468  for (x = 0; x < f->width; x++) {
469  ret = color_inc(hist, p[x]);
470  if (ret < 0)
471  return ret;
472  nb_diff_colors += ret;
473  }
474  }
475  return nb_diff_colors;
476 }
477 
478 /**
479  * Update the histogram for each passing frame. No frame will be pushed here.
480  */
481 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
482 {
483  AVFilterContext *ctx = inlink->dst;
484  PaletteGenContext *s = ctx->priv;
485  int ret = s->prev_frame ? update_histogram_diff(s->histogram, s->prev_frame, in)
487 
488  if (ret > 0)
489  s->nb_refs += ret;
490 
493  s->prev_frame = in;
494  } else if (s->stats_mode == STATS_MODE_SINGLE_FRAMES) {
495  AVFrame *out;
496  int i;
497 
498  out = get_palette_frame(ctx);
499  out->pts = in->pts;
500  av_frame_free(&in);
501  ret = ff_filter_frame(ctx->outputs[0], out);
502  for (i = 0; i < HIST_SIZE; i++)
503  av_freep(&s->histogram[i].entries);
504  av_freep(&s->refs);
505  s->nb_refs = 0;
506  s->nb_boxes = 0;
507  memset(s->boxes, 0, sizeof(s->boxes));
508  memset(s->histogram, 0, sizeof(s->histogram));
509  } else {
510  av_frame_free(&in);
511  }
512 
513  return ret;
514 }
515 
516 /**
517  * Returns only one frame at the end containing the full palette.
518  */
519 static int request_frame(AVFilterLink *outlink)
520 {
521  AVFilterContext *ctx = outlink->src;
522  AVFilterLink *inlink = ctx->inputs[0];
523  PaletteGenContext *s = ctx->priv;
524  int r;
525 
526  r = ff_request_frame(inlink);
527  if (r == AVERROR_EOF && !s->palette_pushed && s->nb_refs && s->stats_mode != STATS_MODE_SINGLE_FRAMES) {
528  r = ff_filter_frame(outlink, get_palette_frame(ctx));
529  s->palette_pushed = 1;
530  return r;
531  }
532  return r;
533 }
534 
535 /**
536  * The output is one simple 16x16 squared-pixels palette.
537  */
538 static int config_output(AVFilterLink *outlink)
539 {
540  outlink->w = outlink->h = 16;
541  outlink->sample_aspect_ratio = av_make_q(1, 1);
542  return 0;
543 }
544 
546 {
547  int i;
548  PaletteGenContext *s = ctx->priv;
549 
550  for (i = 0; i < HIST_SIZE; i++)
551  av_freep(&s->histogram[i].entries);
552  av_freep(&s->refs);
554 }
555 
556 static const AVFilterPad palettegen_inputs[] = {
557  {
558  .name = "default",
559  .type = AVMEDIA_TYPE_VIDEO,
560  .filter_frame = filter_frame,
561  },
562  { NULL }
563 };
564 
565 static const AVFilterPad palettegen_outputs[] = {
566  {
567  .name = "default",
568  .type = AVMEDIA_TYPE_VIDEO,
569  .config_props = config_output,
570  .request_frame = request_frame,
571  },
572  { NULL }
573 };
574 
576  .name = "palettegen",
577  .description = NULL_IF_CONFIG_SMALL("Find the optimal palette for a given stream."),
578  .priv_size = sizeof(PaletteGenContext),
579  .uninit = uninit,
581  .inputs = palettegen_inputs,
582  .outputs = palettegen_outputs,
583  .priv_class = &palettegen_class,
584 };
int64_t variance
Definition: vf_palettegen.c:42
static int update_histogram_frame(struct hist_node *hist, const AVFrame *f)
Simple histogram of the frame.
#define NULL
Definition: coverity.c:32
#define DECLARE_CMP_FUNC(name, pos)
const char * s
Definition: avisynth_c.h:768
This structure describes decoded (raw) audio or video data.
Definition: frame.h:184
AVOption.
Definition: opt.h:245
static AVFrame * get_palette_frame(AVFilterContext *ctx)
Main function implementing the Median Cut Algorithm defined by Paul Heckbert in Color Image Quantizat...
static const cmp_func cmp_funcs[]
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
Main libavfilter public API header.
const char * g
Definition: vf_curves.c:112
uint64_t count
Definition: vf_palettegen.c:36
struct color_ref * entries
Definition: vf_palettegen.c:49
static struct color_ref ** load_color_refs(const struct hist_node *hist, int nb_refs)
Crawl the histogram to get all the defined colors, and create a linear list of them (each color refer...
const char * b
Definition: vf_curves.c:113
struct range_box boxes[256]
Definition: vf_palettegen.c:74
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:76
static uint32_t get_avg_color(struct color_ref *const *refs, const struct range_box *box)
Get the 32-bit average color for the range of RGB colors enclosed in the specified box...
AVFILTER_DEFINE_CLASS(palettegen)
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:283
const char * name
Pad name.
Definition: internal.h:59
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:315
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1189
uint8_t
#define av_cold
Definition: attributes.h:82
AVOptions.
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
Definition: log.c:94
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:268
#define FLAGS
Definition: vf_palettegen.c:80
struct hist_node histogram[HIST_SIZE]
Definition: vf_palettegen.c:71
static const uint64_t c1
Definition: murmur3.c:49
#define ff_dlog(a,...)
#define AVERROR_EOF
End of file.
Definition: error.h:55
AVDictionary * metadata
metadata.
Definition: frame.h:474
#define OFFSET(x)
Definition: vf_palettegen.c:79
#define av_log(a,...)
#define NBITS
Definition: vf_palettegen.c:60
A filter pad used for either input or output.
Definition: internal.h:53
uint8_t hash[HASH_SIZE]
Definition: movenc.c:57
static unsigned color_hash(uint32_t color)
Hashing function for the color.
#define U(x)
Definition: vp56_arith.h:37
int width
width and height of the video frame
Definition: frame.h:236
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static int query_formats(AVFilterContext *ctx)
Definition: vf_palettegen.c:93
static const AVOption palettegen_options[]
Definition: vf_palettegen.c:81
#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:158
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
const char * r
Definition: vf_curves.c:111
void * priv
private data for use by the filter
Definition: avfilter.h:322
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Update the histogram for each passing frame.
simple assert() macros that are a bit more flexible than ISO C assert().
#define FFMAX(a, b)
Definition: common.h:94
#define HIST_SIZE
Definition: vf_palettegen.c:61
static const AVFilterPad palettegen_outputs[]
#define FFDIFFSIGN(x, y)
Comparator.
Definition: common.h:92
common internal API header
#define FFMIN(a, b)
Definition: common.h:96
AVFilter ff_vf_palettegen
int ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
Add *ref as a new reference to formats.
Definition: formats.c:440
AVFormatContext * ctx
Definition: movenc.c:48
int n
Definition: avisynth_c.h:684
static const AVFilterPad outputs[]
Definition: af_afftfilt.c:386
static const AVFilterPad palettegen_inputs[]
static int get_next_box_id_to_split(PaletteGenContext *s)
Find the next box to split: pick the one with the highest variance.
uint32_t color
Definition: vf_palettegen.c:35
static void write_palette(AVFilterContext *ctx, AVFrame *out)
Write the palette into the output frame.
AVFrame * prev_frame
Definition: vf_palettegen.c:70
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
static const AVFilterPad inputs[]
Definition: af_afftfilt.c:376
uint32_t color
Definition: vf_palettegen.c:41
void * av_dynarray2_add(void **tab_ptr, int *nb_ptr, size_t elem_size, const uint8_t *elem_data)
Add an element of size elem_size to a dynamic array.
Definition: mem.c:338
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:215
static AVRational av_make_q(int num, int den)
Create an AVRational.
Definition: rational.h:71
static av_cold void uninit(AVFilterContext *ctx)
#define AV_PIX_FMT_RGB32
Definition: pixfmt.h:318
int(* cmp_func)(const void *, const void *)
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
void * buf
Definition: avisynth_c.h:690
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
const char * name
Filter name.
Definition: avfilter.h:148
#define snprintf
Definition: snprintf.h:34
int nb_entries
Definition: vf_palettegen.c:50
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:319
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:198
static int config_output(AVFilterLink *outlink)
The output is one simple 16x16 squared-pixels palette.
static int request_frame(AVFilterLink *outlink)
Returns only one frame at the end containing the full palette.
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:107
struct color_ref ** refs
Definition: vf_palettegen.c:72
static const uint64_t c2
Definition: murmur3.c:50
static void split_box(PaletteGenContext *s, struct range_box *box, int n)
Split given box in two at position n.
static av_always_inline int diff(const uint32_t a, const uint32_t b)
static int color_inc(struct hist_node *hist, uint32_t color)
Locate the color in the hash table and increment its counter.
static int update_histogram_diff(struct hist_node *hist, const AVFrame *f1, const AVFrame *f2)
Update histogram when pixels differ from previous frame.
A list of supported formats for one end of a filter link.
Definition: formats.h:64
An instance of a filter.
Definition: avfilter.h:307
int height
Definition: frame.h:236
FILE * out
Definition: movenc.c:54
#define av_freep(p)
void INT64 start
Definition: avisynth_c.h:690
#define av_always_inline
Definition: attributes.h:39
#define av_malloc_array(a, b)
static int cmp_color(const void *a, const void *b)
Simple color comparison for sorting the final palette.
int ff_request_frame(AVFilterLink *link)
Request an input frame from the filter at the other end of the link.
Definition: avfilter.c:369
internal API functions
float min
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
static double set_colorquant_ratio_meta(AVFrame *out, int nb_out, int nb_in)
#define AV_QSORT(p, num, type, cmp)
Quicksort This sort is fast, and fully inplace but not stable and it is possible to construct input t...
Definition: qsort.h:33
for(j=16;j >0;--j)