Lines Matching refs:elbg
31 #include "elbg.h"
97 static int eval_error_cell(ELBGContext *elbg, int *centroid, cell *cells)
101 error += distance_limited(centroid, elbg->points + cells->index*elbg->dim, elbg->dim, INT_MAX);
106 static int get_closest_codebook(ELBGContext *elbg, int index)
109 for (int i = 0, diff_min = INT_MAX; i < elbg->num_cb; i++)
112 diff = distance_limited(elbg->codebook + i*elbg->dim, elbg->codebook + index*elbg->dim, elbg->dim, diff_min);
121 static int get_high_utility_cell(ELBGContext *elbg)
127 if (elbg->utility_inc[elbg->num_cb - 1] < INT_MAX) {
128 r = av_lfg_get(elbg->rand_state) % (unsigned int)elbg->utility_inc[elbg->num_cb - 1] + 1;
130 r = av_lfg_get(elbg->rand_state);
131 r = (av_lfg_get(elbg->rand_state) + (r<<32)) % elbg->utility_inc[elbg->num_cb - 1] + 1;
134 while (elbg->utility_inc[i] < r) {
138 av_assert2(elbg->cells[i]);
146 static int simple_lbg(ELBGContext *elbg,
156 elbg->scratchbuf + 3*dim,
157 elbg->scratchbuf + 4*dim
187 static void get_new_centroids(ELBGContext *elbg, int huc, int *newcentroid_i,
195 for (i=0; i< elbg->dim; i++) {
200 for (tempcell = elbg->cells[huc]; tempcell; tempcell = tempcell->next)
201 for(i=0; i<elbg->dim; i++) {
202 min[i]=FFMIN(min[i], elbg->points[tempcell->index*elbg->dim + i]);
203 max[i]=FFMAX(max[i], elbg->points[tempcell->index*elbg->dim + i]);
206 for (i=0; i<elbg->dim; i++) {
219 * @param elbg Internal elbg data
223 static void shift_codebook(ELBGContext *elbg, int *indexes,
227 cell **pp = &elbg->cells[indexes[2]];
232 *pp = elbg->cells[indexes[0]];
234 elbg->cells[indexes[0]] = NULL;
235 tempdata = elbg->cells[indexes[1]];
236 elbg->cells[indexes[1]] = NULL;
240 int idx = distance_limited(elbg->points + tempdata->index*elbg->dim,
241 newcentroid[0], elbg->dim, INT_MAX) >
242 distance_limited(elbg->points + tempdata->index*elbg->dim,
243 newcentroid[1], elbg->dim, INT_MAX);
245 tempdata->next = elbg->cells[indexes[idx]];
246 elbg->cells[indexes[idx]] = tempdata;
251 static void evaluate_utility_inc(ELBGContext *elbg)
255 for (int i = 0; i < elbg->num_cb; i++) {
256 if (elbg->num_cb * elbg->utility[i] > elbg->error)
257 inc += elbg->utility[i];
258 elbg->utility_inc[i] = inc;
263 static void update_utility_and_n_cb(ELBGContext *elbg, int idx, int newutility)
267 elbg->utility[idx] = newutility;
268 for (tempcell=elbg->cells[idx]; tempcell; tempcell=tempcell->next)
269 elbg->nearest_cb[tempcell->index] = idx;
274 * and update elbg->error, elbg->utility and elbg->nearest_cb.
276 * @param elbg Internal elbg data
279 static void try_shift_candidate(ELBGContext *elbg, int idx[3])
285 elbg->scratchbuf,
286 elbg->scratchbuf + elbg->dim,
287 elbg->scratchbuf + 2*elbg->dim
292 olderror += elbg->utility[idx[j]];
294 memset(newcentroid[2], 0, elbg->dim*sizeof(int));
297 for (tempcell=elbg->cells[idx[2*k]]; tempcell; tempcell=tempcell->next) {
299 for (j=0; j<elbg->dim; j++)
300 newcentroid[2][j] += elbg->points[tempcell->index*elbg->dim + j];
303 vect_division(newcentroid[2], newcentroid[2], cont, elbg->dim);
305 get_new_centroids(elbg, idx[1], newcentroid[0], newcentroid[1]);
307 newutility[2] = eval_error_cell(elbg, newcentroid[2], elbg->cells[idx[0]]);
308 newutility[2] += eval_error_cell(elbg, newcentroid[2], elbg->cells[idx[2]]);
312 newerror += simple_lbg(elbg, elbg->dim, newcentroid, newutility, elbg->points,
313 elbg->cells[idx[1]]);
316 shift_codebook(elbg, idx, newcentroid);
318 elbg->error += newerror - olderror;
321 update_utility_and_n_cb(elbg, idx[j], newutility[j]);
323 evaluate_utility_inc(elbg);
330 static void do_shiftings(ELBGContext *elbg)
334 evaluate_utility_inc(elbg);
336 for (idx[0]=0; idx[0] < elbg->num_cb; idx[0]++)
337 if (elbg->num_cb * elbg->utility[idx[0]] < elbg->error) {
338 if (elbg->utility_inc[elbg->num_cb - 1] == 0)
341 idx[1] = get_high_utility_cell(elbg);
342 idx[2] = get_closest_codebook(elbg, idx[0]);
345 try_shift_candidate(elbg, idx);
349 static void do_elbg(ELBGContext *av_restrict elbg, int *points, int numpoints,
352 int *const size_part = elbg->size_part;
357 elbg->error = INT64_MAX;
358 elbg->points = points;
361 cell *free_cells = elbg->cell_buffer;
362 last_error = elbg->error;
364 memset(elbg->utility, 0, elbg->num_cb * sizeof(*elbg->utility));
365 memset(elbg->cells, 0, elbg->num_cb * sizeof(*elbg->cells));
367 elbg->error = 0;
372 int best_dist = distance_limited(elbg->points + i * elbg->dim,
373 elbg->codebook + best_idx * elbg->dim,
374 elbg->dim, INT_MAX);
375 for (int k = 0; k < elbg->num_cb; k++) {
376 int dist = distance_limited(elbg->points + i * elbg->dim,
377 elbg->codebook + k * elbg->dim,
378 elbg->dim, best_dist);
384 elbg->nearest_cb[i] = best_idx;
385 elbg->error += best_dist;
386 elbg->utility[elbg->nearest_cb[i]] += best_dist;
388 free_cells->next = elbg->cells[elbg->nearest_cb[i]];
389 elbg->cells[elbg->nearest_cb[i]] = free_cells;
393 do_shiftings(elbg);
395 memset(size_part, 0, elbg->num_cb * sizeof(*size_part));
397 memset(elbg->codebook, 0, elbg->num_cb * elbg->dim * sizeof(*elbg->codebook));
400 size_part[elbg->nearest_cb[i]]++;
401 for (j=0; j < elbg->dim; j++)
402 elbg->codebook[elbg->nearest_cb[i]*elbg->dim + j] +=
403 elbg->points[i*elbg->dim + j];
406 for (int i = 0; i < elbg->num_cb; i++)
407 vect_division(elbg->codebook + i*elbg->dim,
408 elbg->codebook + i*elbg->dim, size_part[i], elbg->dim);
410 } while(((last_error - elbg->error) > DELTA_ERR_MAX*elbg->error) &&
417 * Initialize the codebook vector for the elbg algorithm.
422 static void init_elbg(ELBGContext *av_restrict elbg, int *points, int *temp_points,
425 int dim = elbg->dim;
427 if (numpoints > 24LL * elbg->num_cb) {
437 init_elbg(elbg, temp_points, temp_points + numpoints / 8 * dim,
439 do_elbg(elbg, temp_points, numpoints / 8, 2 * max_steps);
441 for (int i = 0; i < elbg->num_cb; i++)
442 memcpy(elbg->codebook + i * dim, points + ((i*BIG_PRIME)%numpoints)*dim,
443 dim * sizeof(*elbg->codebook));
450 ELBGContext *const av_restrict elbg = *elbgp ? *elbgp : av_mallocz(sizeof(*elbg));
452 if (!elbg)
454 *elbgp = elbg;
456 elbg->nearest_cb = closest_cb;
457 elbg->rand_state = rand_state;
458 elbg->codebook = codebook;
459 elbg->num_cb = num_cb;
460 elbg->dim = dim;
463 if (elbg->field ## _allocated < new_elements) { \
464 av_freep(&elbg->field); \
465 elbg->field = av_malloc_array(new_elements, \
466 multiplicator * sizeof(*elbg->field)); \
467 if (!elbg->field) { \
468 elbg->field ## _allocated = 0; \
471 elbg->field ## _allocated = new_elements; \
483 if (numpoints > 24LL * elbg->num_cb) {
494 init_elbg(elbg, points, elbg->temp_points, numpoints, max_steps);
495 do_elbg (elbg, points, numpoints, max_steps);
501 ELBGContext *elbg = *elbgp;
502 if (!elbg)
505 av_freep(&elbg->size_part);
506 av_freep(&elbg->utility);
507 av_freep(&elbg->cell_buffer);
508 av_freep(&elbg->cells);
509 av_freep(&elbg->utility_inc);
510 av_freep(&elbg->scratchbuf);
511 av_freep(&elbg->temp_points);