2 * Copyright (c) 2017 Paul B Mahol
4 * This file is part of FFmpeg.
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.
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.
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
21 #include "libavutil/audio_fifo.h"
22 #include "libavutil/channel_layout.h"
23 #include "libavutil/opt.h"
24 #include "libavcodec/avfft.h"
28 #include "window_func.h"
30 typedef struct AudioSurroundContext {
33 char *out_channel_layout_str;
34 char *in_channel_layout_str;
77 uint64_t out_channel_layout;
78 uint64_t in_channel_layout;
84 AVFrame *overlap_buffer;
89 RDFTContext **rdft, **irdft;
90 float *window_func_lut;
94 void (*filter)(AVFilterContext *ctx);
95 void (*upmix_stereo)(AVFilterContext *ctx,
102 void (*upmix_2_1)(AVFilterContext *ctx,
111 void (*upmix_3_0)(AVFilterContext *ctx,
119 void (*upmix_5_0)(AVFilterContext *ctx,
120 float c_re, float c_im,
121 float mag_totall, float mag_totalr,
122 float fl_phase, float fr_phase,
123 float bl_phase, float br_phase,
124 float sl_phase, float sr_phase,
128 void (*upmix_5_1)(AVFilterContext *ctx,
129 float c_re, float c_im,
130 float lfe_re, float lfe_im,
131 float mag_totall, float mag_totalr,
132 float fl_phase, float fr_phase,
133 float bl_phase, float br_phase,
134 float sl_phase, float sr_phase,
138 } AudioSurroundContext;
140 static int query_formats(AVFilterContext *ctx)
142 AudioSurroundContext *s = ctx->priv;
143 AVFilterFormats *formats = NULL;
144 AVFilterChannelLayouts *layouts = NULL;
147 ret = ff_add_format(&formats, AV_SAMPLE_FMT_FLTP);
150 ret = ff_set_common_formats(ctx, formats);
155 ret = ff_add_channel_layout(&layouts, s->out_channel_layout);
159 ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts);
164 ret = ff_add_channel_layout(&layouts, s->in_channel_layout);
168 ret = ff_channel_layouts_ref(layouts, &ctx->inputs[0]->out_channel_layouts);
172 formats = ff_all_samplerates();
174 return AVERROR(ENOMEM);
175 return ff_set_common_samplerates(ctx, formats);
178 static int config_input(AVFilterLink *inlink)
180 AVFilterContext *ctx = inlink->dst;
181 AudioSurroundContext *s = ctx->priv;
184 s->rdft = av_calloc(inlink->channels, sizeof(*s->rdft));
186 return AVERROR(ENOMEM);
188 for (ch = 0; ch < inlink->channels; ch++) {
189 s->rdft[ch] = av_rdft_init(ff_log2(s->buf_size), DFT_R2C);
191 return AVERROR(ENOMEM);
193 s->nb_in_channels = inlink->channels;
194 s->input_levels = av_malloc_array(s->nb_in_channels, sizeof(*s->input_levels));
195 if (!s->input_levels)
196 return AVERROR(ENOMEM);
197 for (ch = 0; ch < s->nb_in_channels; ch++)
198 s->input_levels[ch] = s->level_in;
199 ch = av_get_channel_layout_channel_index(inlink->channel_layout, AV_CH_FRONT_CENTER);
201 s->input_levels[ch] *= s->fc_in;
202 ch = av_get_channel_layout_channel_index(inlink->channel_layout, AV_CH_LOW_FREQUENCY);
204 s->input_levels[ch] *= s->lfe_in;
206 s->input = ff_get_audio_buffer(inlink, s->buf_size * 2);
208 return AVERROR(ENOMEM);
210 s->fifo = av_audio_fifo_alloc(inlink->format, inlink->channels, s->buf_size);
212 return AVERROR(ENOMEM);
214 s->lowcut = 1.f * s->lowcutf / (inlink->sample_rate * 0.5) * (s->buf_size / 2);
215 s->highcut = 1.f * s->highcutf / (inlink->sample_rate * 0.5) * (s->buf_size / 2);
220 static int config_output(AVFilterLink *outlink)
222 AVFilterContext *ctx = outlink->src;
223 AudioSurroundContext *s = ctx->priv;
226 s->irdft = av_calloc(outlink->channels, sizeof(*s->irdft));
228 return AVERROR(ENOMEM);
230 for (ch = 0; ch < outlink->channels; ch++) {
231 s->irdft[ch] = av_rdft_init(ff_log2(s->buf_size), IDFT_C2R);
233 return AVERROR(ENOMEM);
235 s->nb_out_channels = outlink->channels;
236 s->output_levels = av_malloc_array(s->nb_out_channels, sizeof(*s->output_levels));
237 if (!s->output_levels)
238 return AVERROR(ENOMEM);
239 for (ch = 0; ch < s->nb_out_channels; ch++)
240 s->output_levels[ch] = s->level_out;
241 ch = av_get_channel_layout_channel_index(outlink->channel_layout, AV_CH_FRONT_CENTER);
243 s->output_levels[ch] *= s->fc_out;
244 ch = av_get_channel_layout_channel_index(outlink->channel_layout, AV_CH_LOW_FREQUENCY);
246 s->output_levels[ch] *= s->lfe_out;
248 s->output = ff_get_audio_buffer(outlink, s->buf_size * 2);
249 s->overlap_buffer = ff_get_audio_buffer(outlink, s->buf_size * 2);
250 if (!s->overlap_buffer || !s->output)
251 return AVERROR(ENOMEM);
256 static void stereo_position(float a, float p, float *x, float *y)
258 *x = av_clipf(a+FFMAX(0, sinf(p-M_PI_2))*FFDIFFSIGN(a,0), -1, 1);
259 *y = av_clipf(cosf(a*M_PI_2+M_PI)*cosf(M_PI_2-p/M_PI)*M_LN10+1, -1, 1);
262 static inline void get_lfe(int output_lfe, int n, float lowcut, float highcut,
263 float *lfe_mag, float *mag_total, int lfe_mode)
265 if (output_lfe && n < highcut) {
266 *lfe_mag = n < lowcut ? 1.f : .5f*(1.f+cosf(M_PI*(lowcut-n)/(lowcut-highcut)));
267 *lfe_mag *= *mag_total;
269 *mag_total -= *lfe_mag;
275 static void upmix_1_0(AVFilterContext *ctx,
283 AudioSurroundContext *s = ctx->priv;
286 dst = (float *)s->output->extended_data[0];
288 mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
290 dst[2 * n ] = mag * cosf(c_phase);
291 dst[2 * n + 1] = mag * sinf(c_phase);
294 static void upmix_stereo(AVFilterContext *ctx,
302 AudioSurroundContext *s = ctx->priv;
303 float l_mag, r_mag, *dstl, *dstr;
305 dstl = (float *)s->output->extended_data[0];
306 dstr = (float *)s->output->extended_data[1];
308 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
309 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
311 dstl[2 * n ] = l_mag * cosf(l_phase);
312 dstl[2 * n + 1] = l_mag * sinf(l_phase);
314 dstr[2 * n ] = r_mag * cosf(r_phase);
315 dstr[2 * n + 1] = r_mag * sinf(r_phase);
318 static void upmix_2_1(AVFilterContext *ctx,
326 AudioSurroundContext *s = ctx->priv;
327 float lfe_mag, l_mag, r_mag, *dstl, *dstr, *dstlfe;
329 dstl = (float *)s->output->extended_data[0];
330 dstr = (float *)s->output->extended_data[1];
331 dstlfe = (float *)s->output->extended_data[2];
333 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total, s->lfe_mode);
335 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
336 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
338 dstl[2 * n ] = l_mag * cosf(l_phase);
339 dstl[2 * n + 1] = l_mag * sinf(l_phase);
341 dstr[2 * n ] = r_mag * cosf(r_phase);
342 dstr[2 * n + 1] = r_mag * sinf(r_phase);
344 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
345 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
348 static void upmix_3_0(AVFilterContext *ctx,
356 AudioSurroundContext *s = ctx->priv;
357 float l_mag, r_mag, c_mag, *dstc, *dstl, *dstr;
359 dstl = (float *)s->output->extended_data[0];
360 dstr = (float *)s->output->extended_data[1];
361 dstc = (float *)s->output->extended_data[2];
363 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
364 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
365 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
367 dstl[2 * n ] = l_mag * cosf(l_phase);
368 dstl[2 * n + 1] = l_mag * sinf(l_phase);
370 dstr[2 * n ] = r_mag * cosf(r_phase);
371 dstr[2 * n + 1] = r_mag * sinf(r_phase);
373 dstc[2 * n ] = c_mag * cosf(c_phase);
374 dstc[2 * n + 1] = c_mag * sinf(c_phase);
377 static void upmix_3_1(AVFilterContext *ctx,
385 AudioSurroundContext *s = ctx->priv;
386 float lfe_mag, l_mag, r_mag, c_mag, *dstc, *dstl, *dstr, *dstlfe;
388 dstl = (float *)s->output->extended_data[0];
389 dstr = (float *)s->output->extended_data[1];
390 dstc = (float *)s->output->extended_data[2];
391 dstlfe = (float *)s->output->extended_data[3];
393 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total, s->lfe_mode);
395 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
396 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
397 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
399 dstl[2 * n ] = l_mag * cosf(l_phase);
400 dstl[2 * n + 1] = l_mag * sinf(l_phase);
402 dstr[2 * n ] = r_mag * cosf(r_phase);
403 dstr[2 * n + 1] = r_mag * sinf(r_phase);
405 dstc[2 * n ] = c_mag * cosf(c_phase);
406 dstc[2 * n + 1] = c_mag * sinf(c_phase);
408 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
409 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
412 static void upmix_3_1_surround(AVFilterContext *ctx,
421 AudioSurroundContext *s = ctx->priv;
422 float lfe_mag, l_mag, r_mag, *dstc, *dstl, *dstr, *dstlfe;
424 dstl = (float *)s->output->extended_data[0];
425 dstr = (float *)s->output->extended_data[1];
426 dstc = (float *)s->output->extended_data[2];
427 dstlfe = (float *)s->output->extended_data[3];
429 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &c_mag, s->lfe_mode);
431 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
432 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
434 dstl[2 * n ] = l_mag * cosf(l_phase);
435 dstl[2 * n + 1] = l_mag * sinf(l_phase);
437 dstr[2 * n ] = r_mag * cosf(r_phase);
438 dstr[2 * n + 1] = r_mag * sinf(r_phase);
440 dstc[2 * n ] = c_mag * cosf(c_phase);
441 dstc[2 * n + 1] = c_mag * sinf(c_phase);
443 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
444 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
447 static void upmix_4_0(AVFilterContext *ctx,
455 AudioSurroundContext *s = ctx->priv;
456 float b_mag, l_mag, r_mag, c_mag, *dstc, *dstl, *dstr, *dstb;
458 dstl = (float *)s->output->extended_data[0];
459 dstr = (float *)s->output->extended_data[1];
460 dstc = (float *)s->output->extended_data[2];
461 dstb = (float *)s->output->extended_data[3];
463 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
464 b_mag = powf(1.f - fabsf(x), s->bc_x) * powf((1.f - y) * .5f, s->bc_y) * mag_total;
465 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
466 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
468 dstl[2 * n ] = l_mag * cosf(l_phase);
469 dstl[2 * n + 1] = l_mag * sinf(l_phase);
471 dstr[2 * n ] = r_mag * cosf(r_phase);
472 dstr[2 * n + 1] = r_mag * sinf(r_phase);
474 dstc[2 * n ] = c_mag * cosf(c_phase);
475 dstc[2 * n + 1] = c_mag * sinf(c_phase);
477 dstb[2 * n ] = b_mag * cosf(c_phase);
478 dstb[2 * n + 1] = b_mag * sinf(c_phase);
481 static void upmix_4_1(AVFilterContext *ctx,
489 AudioSurroundContext *s = ctx->priv;
490 float lfe_mag, b_mag, l_mag, r_mag, c_mag, *dstc, *dstl, *dstr, *dstb, *dstlfe;
492 dstl = (float *)s->output->extended_data[0];
493 dstr = (float *)s->output->extended_data[1];
494 dstc = (float *)s->output->extended_data[2];
495 dstlfe = (float *)s->output->extended_data[3];
496 dstb = (float *)s->output->extended_data[4];
498 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total, s->lfe_mode);
500 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
501 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
503 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
504 b_mag = powf(1.f - fabsf(x), s->bc_x) * powf((1.f - y) * .5f, s->bc_y) * mag_total;
505 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
506 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
508 dstl[2 * n ] = l_mag * cosf(l_phase);
509 dstl[2 * n + 1] = l_mag * sinf(l_phase);
511 dstr[2 * n ] = r_mag * cosf(r_phase);
512 dstr[2 * n + 1] = r_mag * sinf(r_phase);
514 dstc[2 * n ] = c_mag * cosf(c_phase);
515 dstc[2 * n + 1] = c_mag * sinf(c_phase);
517 dstb[2 * n ] = b_mag * cosf(c_phase);
518 dstb[2 * n + 1] = b_mag * sinf(c_phase);
521 static void upmix_5_0_back(AVFilterContext *ctx,
529 AudioSurroundContext *s = ctx->priv;
530 float l_mag, r_mag, ls_mag, rs_mag, c_mag, *dstc, *dstl, *dstr, *dstls, *dstrs;
532 dstl = (float *)s->output->extended_data[0];
533 dstr = (float *)s->output->extended_data[1];
534 dstc = (float *)s->output->extended_data[2];
535 dstls = (float *)s->output->extended_data[3];
536 dstrs = (float *)s->output->extended_data[4];
538 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
539 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
540 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
541 ls_mag = powf(.5f * ( x + 1.f), s->bl_x) * powf(1.f - ((y + 1.f) * .5f), s->bl_y) * mag_total;
542 rs_mag = powf(.5f * (-x + 1.f), s->br_x) * powf(1.f - ((y + 1.f) * .5f), s->br_y) * mag_total;
544 dstl[2 * n ] = l_mag * cosf(l_phase);
545 dstl[2 * n + 1] = l_mag * sinf(l_phase);
547 dstr[2 * n ] = r_mag * cosf(r_phase);
548 dstr[2 * n + 1] = r_mag * sinf(r_phase);
550 dstc[2 * n ] = c_mag * cosf(c_phase);
551 dstc[2 * n + 1] = c_mag * sinf(c_phase);
553 dstls[2 * n ] = ls_mag * cosf(l_phase);
554 dstls[2 * n + 1] = ls_mag * sinf(l_phase);
556 dstrs[2 * n ] = rs_mag * cosf(r_phase);
557 dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
560 static void upmix_5_1_back(AVFilterContext *ctx,
568 AudioSurroundContext *s = ctx->priv;
569 float lfe_mag, l_mag, r_mag, ls_mag, rs_mag, c_mag, *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlfe;
571 dstl = (float *)s->output->extended_data[0];
572 dstr = (float *)s->output->extended_data[1];
573 dstc = (float *)s->output->extended_data[2];
574 dstlfe = (float *)s->output->extended_data[3];
575 dstls = (float *)s->output->extended_data[4];
576 dstrs = (float *)s->output->extended_data[5];
578 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total, s->lfe_mode);
580 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
581 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
582 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
583 ls_mag = powf(.5f * ( x + 1.f), s->bl_x) * powf(1.f - ((y + 1.f) * .5f), s->bl_y) * mag_total;
584 rs_mag = powf(.5f * (-x + 1.f), s->br_x) * powf(1.f - ((y + 1.f) * .5f), s->br_y) * mag_total;
586 dstl[2 * n ] = l_mag * cosf(l_phase);
587 dstl[2 * n + 1] = l_mag * sinf(l_phase);
589 dstr[2 * n ] = r_mag * cosf(r_phase);
590 dstr[2 * n + 1] = r_mag * sinf(r_phase);
592 dstc[2 * n ] = c_mag * cosf(c_phase);
593 dstc[2 * n + 1] = c_mag * sinf(c_phase);
595 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
596 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
598 dstls[2 * n ] = ls_mag * cosf(l_phase);
599 dstls[2 * n + 1] = ls_mag * sinf(l_phase);
601 dstrs[2 * n ] = rs_mag * cosf(r_phase);
602 dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
605 static void upmix_6_0(AVFilterContext *ctx,
613 AudioSurroundContext *s = ctx->priv;
614 float l_mag, r_mag, ls_mag, rs_mag, c_mag, b_mag, *dstc, *dstb, *dstl, *dstr, *dstls, *dstrs;
616 dstl = (float *)s->output->extended_data[0];
617 dstr = (float *)s->output->extended_data[1];
618 dstc = (float *)s->output->extended_data[2];
619 dstb = (float *)s->output->extended_data[3];
620 dstls = (float *)s->output->extended_data[4];
621 dstrs = (float *)s->output->extended_data[5];
623 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
624 b_mag = powf(1.f - fabsf(x), s->bc_x) * powf((1.f - y) * .5f, s->bc_y) * mag_total;
625 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
626 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
627 ls_mag = powf(.5f * ( x + 1.f), s->bl_x) * powf(1.f - ((y + 1.f) * .5f), s->bl_y) * mag_total;
628 rs_mag = powf(.5f * (-x + 1.f), s->br_x) * powf(1.f - ((y + 1.f) * .5f), s->br_y) * mag_total;
630 dstl[2 * n ] = l_mag * cosf(l_phase);
631 dstl[2 * n + 1] = l_mag * sinf(l_phase);
633 dstr[2 * n ] = r_mag * cosf(r_phase);
634 dstr[2 * n + 1] = r_mag * sinf(r_phase);
636 dstc[2 * n ] = c_mag * cosf(c_phase);
637 dstc[2 * n + 1] = c_mag * sinf(c_phase);
639 dstls[2 * n ] = ls_mag * cosf(l_phase);
640 dstls[2 * n + 1] = ls_mag * sinf(l_phase);
642 dstrs[2 * n ] = rs_mag * cosf(r_phase);
643 dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
645 dstb[2 * n ] = b_mag * cosf(c_phase);
646 dstb[2 * n + 1] = b_mag * sinf(c_phase);
649 static void upmix_6_1(AVFilterContext *ctx,
657 AudioSurroundContext *s = ctx->priv;
658 float lfe_mag, l_mag, r_mag, ls_mag, rs_mag, c_mag, b_mag, *dstc, *dstb, *dstl, *dstr, *dstls, *dstrs, *dstlfe;
660 dstl = (float *)s->output->extended_data[0];
661 dstr = (float *)s->output->extended_data[1];
662 dstc = (float *)s->output->extended_data[2];
663 dstlfe = (float *)s->output->extended_data[3];
664 dstb = (float *)s->output->extended_data[4];
665 dstls = (float *)s->output->extended_data[5];
666 dstrs = (float *)s->output->extended_data[6];
668 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total, s->lfe_mode);
670 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
671 b_mag = powf(1.f - fabsf(x), s->bc_x) * powf((1.f - y) * .5f, s->bc_y) * mag_total;
672 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
673 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
674 ls_mag = powf(.5f * ( x + 1.f), s->bl_x) * powf(1.f - ((y + 1.f) * .5f), s->bl_y) * mag_total;
675 rs_mag = powf(.5f * (-x + 1.f), s->br_x) * powf(1.f - ((y + 1.f) * .5f), s->br_y) * mag_total;
677 dstl[2 * n ] = l_mag * cosf(l_phase);
678 dstl[2 * n + 1] = l_mag * sinf(l_phase);
680 dstr[2 * n ] = r_mag * cosf(r_phase);
681 dstr[2 * n + 1] = r_mag * sinf(r_phase);
683 dstc[2 * n ] = c_mag * cosf(c_phase);
684 dstc[2 * n + 1] = c_mag * sinf(c_phase);
686 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
687 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
689 dstls[2 * n ] = ls_mag * cosf(l_phase);
690 dstls[2 * n + 1] = ls_mag * sinf(l_phase);
692 dstrs[2 * n ] = rs_mag * cosf(r_phase);
693 dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
695 dstb[2 * n ] = b_mag * cosf(c_phase);
696 dstb[2 * n + 1] = b_mag * sinf(c_phase);
699 static void upmix_5_1_back_surround(AVFilterContext *ctx,
708 AudioSurroundContext *s = ctx->priv;
709 float lfe_mag, l_mag, r_mag, *dstc, *dstl, *dstr, *dstlfe;
710 float ls_mag, rs_mag, *dstls, *dstrs;
712 dstl = (float *)s->output->extended_data[0];
713 dstr = (float *)s->output->extended_data[1];
714 dstc = (float *)s->output->extended_data[2];
715 dstlfe = (float *)s->output->extended_data[3];
716 dstls = (float *)s->output->extended_data[4];
717 dstrs = (float *)s->output->extended_data[5];
719 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &c_mag, s->lfe_mode);
721 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
722 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
723 ls_mag = powf(.5f * ( x + 1.f), s->bl_x) * powf(1.f - ((y + 1.f) * .5f), s->bl_y) * mag_total;
724 rs_mag = powf(.5f * (-x + 1.f), s->br_x) * powf(1.f - ((y + 1.f) * .5f), s->br_y) * mag_total;
726 dstl[2 * n ] = l_mag * cosf(l_phase);
727 dstl[2 * n + 1] = l_mag * sinf(l_phase);
729 dstr[2 * n ] = r_mag * cosf(r_phase);
730 dstr[2 * n + 1] = r_mag * sinf(r_phase);
732 dstc[2 * n ] = c_mag * cosf(c_phase);
733 dstc[2 * n + 1] = c_mag * sinf(c_phase);
735 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
736 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
738 dstls[2 * n ] = ls_mag * cosf(l_phase);
739 dstls[2 * n + 1] = ls_mag * sinf(l_phase);
741 dstrs[2 * n ] = rs_mag * cosf(r_phase);
742 dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
745 static void upmix_5_1_back_2_1(AVFilterContext *ctx,
755 AudioSurroundContext *s = ctx->priv;
756 float c_mag, l_mag, r_mag, *dstc, *dstl, *dstr, *dstlfe;
757 float ls_mag, rs_mag, *dstls, *dstrs;
759 dstl = (float *)s->output->extended_data[0];
760 dstr = (float *)s->output->extended_data[1];
761 dstc = (float *)s->output->extended_data[2];
762 dstlfe = (float *)s->output->extended_data[3];
763 dstls = (float *)s->output->extended_data[4];
764 dstrs = (float *)s->output->extended_data[5];
766 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
767 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
768 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
769 ls_mag = powf(.5f * ( x + 1.f), s->bl_x) * powf(1.f - ((y + 1.f) * .5f), s->bl_y) * mag_total;
770 rs_mag = powf(.5f * (-x + 1.f), s->br_x) * powf(1.f - ((y + 1.f) * .5f), s->br_y) * mag_total;
772 dstl[2 * n ] = l_mag * cosf(l_phase);
773 dstl[2 * n + 1] = l_mag * sinf(l_phase);
775 dstr[2 * n ] = r_mag * cosf(r_phase);
776 dstr[2 * n + 1] = r_mag * sinf(r_phase);
778 dstc[2 * n ] = c_mag * cosf(c_phase);
779 dstc[2 * n + 1] = c_mag * sinf(c_phase);
781 dstlfe[2 * n ] = lfe_re;
782 dstlfe[2 * n + 1] = lfe_im;
784 dstls[2 * n ] = ls_mag * cosf(l_phase);
785 dstls[2 * n + 1] = ls_mag * sinf(l_phase);
787 dstrs[2 * n ] = rs_mag * cosf(r_phase);
788 dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
791 static void upmix_7_0(AVFilterContext *ctx,
799 float l_mag, r_mag, ls_mag, rs_mag, c_mag, lb_mag, rb_mag;
800 float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb;
801 AudioSurroundContext *s = ctx->priv;
803 dstl = (float *)s->output->extended_data[0];
804 dstr = (float *)s->output->extended_data[1];
805 dstc = (float *)s->output->extended_data[2];
806 dstlb = (float *)s->output->extended_data[3];
807 dstrb = (float *)s->output->extended_data[4];
808 dstls = (float *)s->output->extended_data[5];
809 dstrs = (float *)s->output->extended_data[6];
811 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
812 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
813 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
814 lb_mag = powf(.5f * ( x + 1.f), s->bl_x) * powf(1.f - ((y + 1.f) * .5f), s->bl_y) * mag_total;
815 rb_mag = powf(.5f * (-x + 1.f), s->br_x) * powf(1.f - ((y + 1.f) * .5f), s->br_y) * mag_total;
816 ls_mag = powf(.5f * ( x + 1.f), s->sl_x) * powf(1.f - fabsf(y), s->sl_y) * mag_total;
817 rs_mag = powf(.5f * (-x + 1.f), s->sr_x) * powf(1.f - fabsf(y), s->sr_y) * mag_total;
819 dstl[2 * n ] = l_mag * cosf(l_phase);
820 dstl[2 * n + 1] = l_mag * sinf(l_phase);
822 dstr[2 * n ] = r_mag * cosf(r_phase);
823 dstr[2 * n + 1] = r_mag * sinf(r_phase);
825 dstc[2 * n ] = c_mag * cosf(c_phase);
826 dstc[2 * n + 1] = c_mag * sinf(c_phase);
828 dstlb[2 * n ] = lb_mag * cosf(l_phase);
829 dstlb[2 * n + 1] = lb_mag * sinf(l_phase);
831 dstrb[2 * n ] = rb_mag * cosf(r_phase);
832 dstrb[2 * n + 1] = rb_mag * sinf(r_phase);
834 dstls[2 * n ] = ls_mag * cosf(l_phase);
835 dstls[2 * n + 1] = ls_mag * sinf(l_phase);
837 dstrs[2 * n ] = rs_mag * cosf(r_phase);
838 dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
841 static void upmix_7_1(AVFilterContext *ctx,
849 float lfe_mag, l_mag, r_mag, ls_mag, rs_mag, c_mag, lb_mag, rb_mag;
850 float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb, *dstlfe;
851 AudioSurroundContext *s = ctx->priv;
853 dstl = (float *)s->output->extended_data[0];
854 dstr = (float *)s->output->extended_data[1];
855 dstc = (float *)s->output->extended_data[2];
856 dstlfe = (float *)s->output->extended_data[3];
857 dstlb = (float *)s->output->extended_data[4];
858 dstrb = (float *)s->output->extended_data[5];
859 dstls = (float *)s->output->extended_data[6];
860 dstrs = (float *)s->output->extended_data[7];
862 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total, s->lfe_mode);
864 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
865 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
866 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
867 lb_mag = powf(.5f * ( x + 1.f), s->bl_x) * powf(1.f - ((y + 1.f) * .5f), s->bl_y) * mag_total;
868 rb_mag = powf(.5f * (-x + 1.f), s->br_x) * powf(1.f - ((y + 1.f) * .5f), s->br_y) * mag_total;
869 ls_mag = powf(.5f * ( x + 1.f), s->sl_x) * powf(1.f - fabsf(y), s->sl_y) * mag_total;
870 rs_mag = powf(.5f * (-x + 1.f), s->sr_x) * powf(1.f - fabsf(y), s->sr_y) * mag_total;
872 dstl[2 * n ] = l_mag * cosf(l_phase);
873 dstl[2 * n + 1] = l_mag * sinf(l_phase);
875 dstr[2 * n ] = r_mag * cosf(r_phase);
876 dstr[2 * n + 1] = r_mag * sinf(r_phase);
878 dstc[2 * n ] = c_mag * cosf(c_phase);
879 dstc[2 * n + 1] = c_mag * sinf(c_phase);
881 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
882 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
884 dstlb[2 * n ] = lb_mag * cosf(l_phase);
885 dstlb[2 * n + 1] = lb_mag * sinf(l_phase);
887 dstrb[2 * n ] = rb_mag * cosf(r_phase);
888 dstrb[2 * n + 1] = rb_mag * sinf(r_phase);
890 dstls[2 * n ] = ls_mag * cosf(l_phase);
891 dstls[2 * n + 1] = ls_mag * sinf(l_phase);
893 dstrs[2 * n ] = rs_mag * cosf(r_phase);
894 dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
897 static void upmix_7_1_5_0_side(AVFilterContext *ctx,
898 float c_re, float c_im,
899 float mag_totall, float mag_totalr,
900 float fl_phase, float fr_phase,
901 float bl_phase, float br_phase,
902 float sl_phase, float sr_phase,
907 float fl_mag, fr_mag, ls_mag, rs_mag, lb_mag, rb_mag;
908 float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb, *dstlfe;
909 float lfe_mag, c_phase, mag_total = (mag_totall + mag_totalr) * 0.5;
910 AudioSurroundContext *s = ctx->priv;
912 dstl = (float *)s->output->extended_data[0];
913 dstr = (float *)s->output->extended_data[1];
914 dstc = (float *)s->output->extended_data[2];
915 dstlfe = (float *)s->output->extended_data[3];
916 dstlb = (float *)s->output->extended_data[4];
917 dstrb = (float *)s->output->extended_data[5];
918 dstls = (float *)s->output->extended_data[6];
919 dstrs = (float *)s->output->extended_data[7];
921 c_phase = atan2f(c_im, c_re);
923 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total, s->lfe_mode);
925 fl_mag = powf(.5f * (xl + 1.f), s->fl_x) * powf((yl + 1.f) * .5f, s->fl_y) * mag_totall;
926 fr_mag = powf(.5f * (xr + 1.f), s->fr_x) * powf((yr + 1.f) * .5f, s->fr_y) * mag_totalr;
927 lb_mag = powf(.5f * (-xl + 1.f), s->bl_x) * powf((yl + 1.f) * .5f, s->bl_y) * mag_totall;
928 rb_mag = powf(.5f * (-xr + 1.f), s->br_x) * powf((yr + 1.f) * .5f, s->br_y) * mag_totalr;
929 ls_mag = powf(1.f - fabsf(xl), s->sl_x) * powf((yl + 1.f) * .5f, s->sl_y) * mag_totall;
930 rs_mag = powf(1.f - fabsf(xr), s->sr_x) * powf((yr + 1.f) * .5f, s->sr_y) * mag_totalr;
932 dstl[2 * n ] = fl_mag * cosf(fl_phase);
933 dstl[2 * n + 1] = fl_mag * sinf(fl_phase);
935 dstr[2 * n ] = fr_mag * cosf(fr_phase);
936 dstr[2 * n + 1] = fr_mag * sinf(fr_phase);
939 dstc[2 * n + 1] = c_im;
941 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
942 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
944 dstlb[2 * n ] = lb_mag * cosf(bl_phase);
945 dstlb[2 * n + 1] = lb_mag * sinf(bl_phase);
947 dstrb[2 * n ] = rb_mag * cosf(br_phase);
948 dstrb[2 * n + 1] = rb_mag * sinf(br_phase);
950 dstls[2 * n ] = ls_mag * cosf(sl_phase);
951 dstls[2 * n + 1] = ls_mag * sinf(sl_phase);
953 dstrs[2 * n ] = rs_mag * cosf(sr_phase);
954 dstrs[2 * n + 1] = rs_mag * sinf(sr_phase);
957 static void upmix_7_1_5_1(AVFilterContext *ctx,
958 float c_re, float c_im,
959 float lfe_re, float lfe_im,
960 float mag_totall, float mag_totalr,
961 float fl_phase, float fr_phase,
962 float bl_phase, float br_phase,
963 float sl_phase, float sr_phase,
968 float fl_mag, fr_mag, ls_mag, rs_mag, lb_mag, rb_mag;
969 float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb, *dstlfe;
970 AudioSurroundContext *s = ctx->priv;
972 dstl = (float *)s->output->extended_data[0];
973 dstr = (float *)s->output->extended_data[1];
974 dstc = (float *)s->output->extended_data[2];
975 dstlfe = (float *)s->output->extended_data[3];
976 dstlb = (float *)s->output->extended_data[4];
977 dstrb = (float *)s->output->extended_data[5];
978 dstls = (float *)s->output->extended_data[6];
979 dstrs = (float *)s->output->extended_data[7];
981 fl_mag = powf(.5f * (xl + 1.f), s->fl_x) * powf((yl + 1.f) * .5f, s->fl_y) * mag_totall;
982 fr_mag = powf(.5f * (xr + 1.f), s->fr_x) * powf((yr + 1.f) * .5f, s->fr_y) * mag_totalr;
983 lb_mag = powf(.5f * (-xl + 1.f), s->bl_x) * powf((yl + 1.f) * .5f, s->bl_y) * mag_totall;
984 rb_mag = powf(.5f * (-xr + 1.f), s->br_x) * powf((yr + 1.f) * .5f, s->br_y) * mag_totalr;
985 ls_mag = powf(1.f - fabsf(xl), s->sl_x) * powf((yl + 1.f) * .5f, s->sl_y) * mag_totall;
986 rs_mag = powf(1.f - fabsf(xr), s->sl_x) * powf((yr + 1.f) * .5f, s->sr_y) * mag_totalr;
988 dstl[2 * n ] = fl_mag * cosf(fl_phase);
989 dstl[2 * n + 1] = fl_mag * sinf(fl_phase);
991 dstr[2 * n ] = fr_mag * cosf(fr_phase);
992 dstr[2 * n + 1] = fr_mag * sinf(fr_phase);
995 dstc[2 * n + 1] = c_im;
997 dstlfe[2 * n ] = lfe_re;
998 dstlfe[2 * n + 1] = lfe_im;
1000 dstlb[2 * n ] = lb_mag * cosf(bl_phase);
1001 dstlb[2 * n + 1] = lb_mag * sinf(bl_phase);
1003 dstrb[2 * n ] = rb_mag * cosf(br_phase);
1004 dstrb[2 * n + 1] = rb_mag * sinf(br_phase);
1006 dstls[2 * n ] = ls_mag * cosf(sl_phase);
1007 dstls[2 * n + 1] = ls_mag * sinf(sl_phase);
1009 dstrs[2 * n ] = rs_mag * cosf(sr_phase);
1010 dstrs[2 * n + 1] = rs_mag * sinf(sr_phase);
1013 static void filter_stereo(AVFilterContext *ctx)
1015 AudioSurroundContext *s = ctx->priv;
1019 srcl = (float *)s->input->extended_data[0];
1020 srcr = (float *)s->input->extended_data[1];
1022 for (n = 0; n < s->buf_size; n++) {
1023 float l_re = srcl[2 * n], r_re = srcr[2 * n];
1024 float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
1025 float c_phase = atan2f(l_im + r_im, l_re + r_re);
1026 float l_mag = hypotf(l_re, l_im);
1027 float r_mag = hypotf(r_re, r_im);
1028 float l_phase = atan2f(l_im, l_re);
1029 float r_phase = atan2f(r_im, r_re);
1030 float phase_dif = fabsf(l_phase - r_phase);
1031 float mag_sum = l_mag + r_mag;
1032 float mag_dif = mag_sum < 0.000001 ? 0.f : (l_mag - r_mag) / mag_sum;
1033 float mag_total = hypotf(l_mag, r_mag);
1036 if (phase_dif > M_PI)
1037 phase_dif = 2 * M_PI - phase_dif;
1039 stereo_position(mag_dif, phase_dif, &x, &y);
1041 s->upmix_stereo(ctx, l_phase, r_phase, c_phase, mag_total, x, y, n);
1045 static void filter_surround(AVFilterContext *ctx)
1047 AudioSurroundContext *s = ctx->priv;
1048 float *srcl, *srcr, *srcc;
1051 srcl = (float *)s->input->extended_data[0];
1052 srcr = (float *)s->input->extended_data[1];
1053 srcc = (float *)s->input->extended_data[2];
1055 for (n = 0; n < s->buf_size; n++) {
1056 float l_re = srcl[2 * n], r_re = srcr[2 * n];
1057 float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
1058 float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
1059 float c_mag = hypotf(c_re, c_im);
1060 float c_phase = atan2f(c_im, c_re);
1061 float l_mag = hypotf(l_re, l_im);
1062 float r_mag = hypotf(r_re, r_im);
1063 float l_phase = atan2f(l_im, l_re);
1064 float r_phase = atan2f(r_im, r_re);
1065 float phase_dif = fabsf(l_phase - r_phase);
1066 float mag_sum = l_mag + r_mag;
1067 float mag_dif = mag_sum < 0.000001 ? 0.f : (l_mag - r_mag) / mag_sum;
1068 float mag_total = hypotf(l_mag, r_mag);
1071 if (phase_dif > M_PI)
1072 phase_dif = 2 * M_PI - phase_dif;
1074 stereo_position(mag_dif, phase_dif, &x, &y);
1076 s->upmix_3_0(ctx, l_phase, r_phase, c_phase, c_mag, mag_total, x, y, n);
1080 static void filter_2_1(AVFilterContext *ctx)
1082 AudioSurroundContext *s = ctx->priv;
1083 float *srcl, *srcr, *srclfe;
1086 srcl = (float *)s->input->extended_data[0];
1087 srcr = (float *)s->input->extended_data[1];
1088 srclfe = (float *)s->input->extended_data[2];
1090 for (n = 0; n < s->buf_size; n++) {
1091 float l_re = srcl[2 * n], r_re = srcr[2 * n];
1092 float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
1093 float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
1094 float c_phase = atan2f(l_im + r_im, l_re + r_re);
1095 float l_mag = hypotf(l_re, l_im);
1096 float r_mag = hypotf(r_re, r_im);
1097 float l_phase = atan2f(l_im, l_re);
1098 float r_phase = atan2f(r_im, r_re);
1099 float phase_dif = fabsf(l_phase - r_phase);
1100 float mag_sum = l_mag + r_mag;
1101 float mag_dif = mag_sum < 0.000001 ? 0.f : (l_mag - r_mag) / mag_sum;
1102 float mag_total = hypotf(l_mag, r_mag);
1105 if (phase_dif > M_PI)
1106 phase_dif = 2 * M_PI - phase_dif;
1108 stereo_position(mag_dif, phase_dif, &x, &y);
1110 s->upmix_2_1(ctx, l_phase, r_phase, c_phase, mag_total, lfe_re, lfe_im, x, y, n);
1114 static void filter_5_0_side(AVFilterContext *ctx)
1116 AudioSurroundContext *s = ctx->priv;
1117 float *srcl, *srcr, *srcc, *srcsl, *srcsr;
1120 srcl = (float *)s->input->extended_data[0];
1121 srcr = (float *)s->input->extended_data[1];
1122 srcc = (float *)s->input->extended_data[2];
1123 srcsl = (float *)s->input->extended_data[3];
1124 srcsr = (float *)s->input->extended_data[4];
1126 for (n = 0; n < s->buf_size; n++) {
1127 float fl_re = srcl[2 * n], fr_re = srcr[2 * n];
1128 float fl_im = srcl[2 * n + 1], fr_im = srcr[2 * n + 1];
1129 float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
1130 float sl_re = srcsl[2 * n], sl_im = srcsl[2 * n + 1];
1131 float sr_re = srcsr[2 * n], sr_im = srcsr[2 * n + 1];
1132 float fl_mag = hypotf(fl_re, fl_im);
1133 float fr_mag = hypotf(fr_re, fr_im);
1134 float fl_phase = atan2f(fl_im, fl_re);
1135 float fr_phase = atan2f(fr_im, fr_re);
1136 float sl_mag = hypotf(sl_re, sl_im);
1137 float sr_mag = hypotf(sr_re, sr_im);
1138 float sl_phase = atan2f(sl_im, sl_re);
1139 float sr_phase = atan2f(sr_im, sr_re);
1140 float phase_difl = fabsf(fl_phase - sl_phase);
1141 float phase_difr = fabsf(fr_phase - sr_phase);
1142 float magl_sum = fl_mag + sl_mag;
1143 float magr_sum = fr_mag + sr_mag;
1144 float mag_difl = magl_sum < 0.000001 ? 0.f : (fl_mag - sl_mag) / magl_sum;
1145 float mag_difr = magr_sum < 0.000001 ? 0.f : (fr_mag - sr_mag) / magr_sum;
1146 float mag_totall = hypotf(fl_mag, sl_mag);
1147 float mag_totalr = hypotf(fr_mag, sr_mag);
1148 float bl_phase = atan2f(fl_im + sl_im, fl_re + sl_re);
1149 float br_phase = atan2f(fr_im + sr_im, fr_re + sr_re);
1153 if (phase_difl > M_PI)
1154 phase_difl = 2 * M_PI - phase_difl;
1156 if (phase_difr > M_PI)
1157 phase_difr = 2 * M_PI - phase_difr;
1159 stereo_position(mag_difl, phase_difl, &xl, &yl);
1160 stereo_position(mag_difr, phase_difr, &xr, &yr);
1162 s->upmix_5_0(ctx, c_re, c_im,
1163 mag_totall, mag_totalr,
1171 static void filter_5_1_side(AVFilterContext *ctx)
1173 AudioSurroundContext *s = ctx->priv;
1174 float *srcl, *srcr, *srcc, *srclfe, *srcsl, *srcsr;
1177 srcl = (float *)s->input->extended_data[0];
1178 srcr = (float *)s->input->extended_data[1];
1179 srcc = (float *)s->input->extended_data[2];
1180 srclfe = (float *)s->input->extended_data[3];
1181 srcsl = (float *)s->input->extended_data[4];
1182 srcsr = (float *)s->input->extended_data[5];
1184 for (n = 0; n < s->buf_size; n++) {
1185 float fl_re = srcl[2 * n], fr_re = srcr[2 * n];
1186 float fl_im = srcl[2 * n + 1], fr_im = srcr[2 * n + 1];
1187 float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
1188 float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
1189 float sl_re = srcsl[2 * n], sl_im = srcsl[2 * n + 1];
1190 float sr_re = srcsr[2 * n], sr_im = srcsr[2 * n + 1];
1191 float fl_mag = hypotf(fl_re, fl_im);
1192 float fr_mag = hypotf(fr_re, fr_im);
1193 float fl_phase = atan2f(fl_im, fl_re);
1194 float fr_phase = atan2f(fr_im, fr_re);
1195 float sl_mag = hypotf(sl_re, sl_im);
1196 float sr_mag = hypotf(sr_re, sr_im);
1197 float sl_phase = atan2f(sl_im, sl_re);
1198 float sr_phase = atan2f(sr_im, sr_re);
1199 float phase_difl = fabsf(fl_phase - sl_phase);
1200 float phase_difr = fabsf(fr_phase - sr_phase);
1201 float magl_sum = fl_mag + sl_mag;
1202 float magr_sum = fr_mag + sr_mag;
1203 float mag_difl = magl_sum < 0.000001 ? 0.f : (fl_mag - sl_mag) / magl_sum;
1204 float mag_difr = magr_sum < 0.000001 ? 0.f : (fr_mag - sr_mag) / magr_sum;
1205 float mag_totall = hypotf(fl_mag, sl_mag);
1206 float mag_totalr = hypotf(fr_mag, sr_mag);
1207 float bl_phase = atan2f(fl_im + sl_im, fl_re + sl_re);
1208 float br_phase = atan2f(fr_im + sr_im, fr_re + sr_re);
1212 if (phase_difl > M_PI)
1213 phase_difl = 2 * M_PI - phase_difl;
1215 if (phase_difr > M_PI)
1216 phase_difr = 2 * M_PI - phase_difr;
1218 stereo_position(mag_difl, phase_difl, &xl, &yl);
1219 stereo_position(mag_difr, phase_difr, &xr, &yr);
1221 s->upmix_5_1(ctx, c_re, c_im, lfe_re, lfe_im,
1222 mag_totall, mag_totalr,
1230 static void filter_5_1_back(AVFilterContext *ctx)
1232 AudioSurroundContext *s = ctx->priv;
1233 float *srcl, *srcr, *srcc, *srclfe, *srcbl, *srcbr;
1236 srcl = (float *)s->input->extended_data[0];
1237 srcr = (float *)s->input->extended_data[1];
1238 srcc = (float *)s->input->extended_data[2];
1239 srclfe = (float *)s->input->extended_data[3];
1240 srcbl = (float *)s->input->extended_data[4];
1241 srcbr = (float *)s->input->extended_data[5];
1243 for (n = 0; n < s->buf_size; n++) {
1244 float fl_re = srcl[2 * n], fr_re = srcr[2 * n];
1245 float fl_im = srcl[2 * n + 1], fr_im = srcr[2 * n + 1];
1246 float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
1247 float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
1248 float bl_re = srcbl[2 * n], bl_im = srcbl[2 * n + 1];
1249 float br_re = srcbr[2 * n], br_im = srcbr[2 * n + 1];
1250 float fl_mag = hypotf(fl_re, fl_im);
1251 float fr_mag = hypotf(fr_re, fr_im);
1252 float fl_phase = atan2f(fl_im, fl_re);
1253 float fr_phase = atan2f(fr_im, fr_re);
1254 float bl_mag = hypotf(bl_re, bl_im);
1255 float br_mag = hypotf(br_re, br_im);
1256 float bl_phase = atan2f(bl_im, bl_re);
1257 float br_phase = atan2f(br_im, br_re);
1258 float phase_difl = fabsf(fl_phase - bl_phase);
1259 float phase_difr = fabsf(fr_phase - br_phase);
1260 float magl_sum = fl_mag + bl_mag;
1261 float magr_sum = fr_mag + br_mag;
1262 float mag_difl = magl_sum < 0.000001 ? 0.f : (fl_mag - bl_mag) / magl_sum;
1263 float mag_difr = magr_sum < 0.000001 ? 0.f : (fr_mag - br_mag) / magr_sum;
1264 float mag_totall = hypotf(fl_mag, bl_mag);
1265 float mag_totalr = hypotf(fr_mag, br_mag);
1266 float sl_phase = atan2f(fl_im + bl_im, fl_re + bl_re);
1267 float sr_phase = atan2f(fr_im + br_im, fr_re + br_re);
1271 if (phase_difl > M_PI)
1272 phase_difl = 2 * M_PI - phase_difl;
1274 if (phase_difr > M_PI)
1275 phase_difr = 2 * M_PI - phase_difr;
1277 stereo_position(mag_difl, phase_difl, &xl, &yl);
1278 stereo_position(mag_difr, phase_difr, &xr, &yr);
1280 s->upmix_5_1(ctx, c_re, c_im, lfe_re, lfe_im,
1281 mag_totall, mag_totalr,
1289 static int init(AVFilterContext *ctx)
1291 AudioSurroundContext *s = ctx->priv;
1295 if (!(s->out_channel_layout = av_get_channel_layout(s->out_channel_layout_str))) {
1296 av_log(ctx, AV_LOG_ERROR, "Error parsing output channel layout '%s'.\n",
1297 s->out_channel_layout_str);
1298 return AVERROR(EINVAL);
1301 if (!(s->in_channel_layout = av_get_channel_layout(s->in_channel_layout_str))) {
1302 av_log(ctx, AV_LOG_ERROR, "Error parsing input channel layout '%s'.\n",
1303 s->in_channel_layout_str);
1304 return AVERROR(EINVAL);
1307 if (s->lowcutf >= s->highcutf) {
1308 av_log(ctx, AV_LOG_ERROR, "Low cut-off '%d' should be less than high cut-off '%d'.\n",
1309 s->lowcutf, s->highcutf);
1310 return AVERROR(EINVAL);
1313 switch (s->in_channel_layout) {
1314 case AV_CH_LAYOUT_STEREO:
1315 s->filter = filter_stereo;
1316 switch (s->out_channel_layout) {
1317 case AV_CH_LAYOUT_MONO:
1318 s->upmix_stereo = upmix_1_0;
1320 case AV_CH_LAYOUT_STEREO:
1321 s->upmix_stereo = upmix_stereo;
1323 case AV_CH_LAYOUT_2POINT1:
1324 s->upmix_stereo = upmix_2_1;
1326 case AV_CH_LAYOUT_SURROUND:
1327 s->upmix_stereo = upmix_3_0;
1329 case AV_CH_LAYOUT_3POINT1:
1330 s->upmix_stereo = upmix_3_1;
1332 case AV_CH_LAYOUT_4POINT0:
1333 s->upmix_stereo = upmix_4_0;
1335 case AV_CH_LAYOUT_4POINT1:
1336 s->upmix_stereo = upmix_4_1;
1338 case AV_CH_LAYOUT_5POINT0_BACK:
1339 s->upmix_stereo = upmix_5_0_back;
1341 case AV_CH_LAYOUT_5POINT1_BACK:
1342 s->upmix_stereo = upmix_5_1_back;
1344 case AV_CH_LAYOUT_6POINT0:
1345 s->upmix_stereo = upmix_6_0;
1347 case AV_CH_LAYOUT_6POINT1:
1348 s->upmix_stereo = upmix_6_1;
1350 case AV_CH_LAYOUT_7POINT0:
1351 s->upmix_stereo = upmix_7_0;
1353 case AV_CH_LAYOUT_7POINT1:
1354 s->upmix_stereo = upmix_7_1;
1360 case AV_CH_LAYOUT_2POINT1:
1361 s->filter = filter_2_1;
1362 switch (s->out_channel_layout) {
1363 case AV_CH_LAYOUT_5POINT1_BACK:
1364 s->upmix_2_1 = upmix_5_1_back_2_1;
1370 case AV_CH_LAYOUT_SURROUND:
1371 s->filter = filter_surround;
1372 switch (s->out_channel_layout) {
1373 case AV_CH_LAYOUT_3POINT1:
1374 s->upmix_3_0 = upmix_3_1_surround;
1376 case AV_CH_LAYOUT_5POINT1_BACK:
1377 s->upmix_3_0 = upmix_5_1_back_surround;
1383 case AV_CH_LAYOUT_5POINT0:
1384 s->filter = filter_5_0_side;
1385 switch (s->out_channel_layout) {
1386 case AV_CH_LAYOUT_7POINT1:
1387 s->upmix_5_0 = upmix_7_1_5_0_side;
1393 case AV_CH_LAYOUT_5POINT1:
1394 s->filter = filter_5_1_side;
1395 switch (s->out_channel_layout) {
1396 case AV_CH_LAYOUT_7POINT1:
1397 s->upmix_5_1 = upmix_7_1_5_1;
1403 case AV_CH_LAYOUT_5POINT1_BACK:
1404 s->filter = filter_5_1_back;
1405 switch (s->out_channel_layout) {
1406 case AV_CH_LAYOUT_7POINT1:
1407 s->upmix_5_1 = upmix_7_1_5_1;
1415 av_log(ctx, AV_LOG_ERROR, "Unsupported upmix: '%s' -> '%s'.\n",
1416 s->in_channel_layout_str, s->out_channel_layout_str);
1417 return AVERROR(EINVAL);
1420 s->buf_size = 1 << av_log2(s->win_size);
1421 s->pts = AV_NOPTS_VALUE;
1423 s->window_func_lut = av_calloc(s->buf_size, sizeof(*s->window_func_lut));
1424 if (!s->window_func_lut)
1425 return AVERROR(ENOMEM);
1427 generate_window_func(s->window_func_lut, s->buf_size, s->win_func, &overlap);
1428 if (s->overlap == 1)
1429 s->overlap = overlap;
1431 for (i = 0; i < s->buf_size; i++)
1432 s->window_func_lut[i] = sqrtf(s->window_func_lut[i] / s->buf_size);
1433 s->hop_size = s->buf_size * (1. - s->overlap);
1434 if (s->hop_size <= 0)
1435 return AVERROR(EINVAL);
1437 if (s->all_x >= 0.f)
1438 s->fc_x = s->fl_x = s->fr_x = s->bc_x = s->sl_x = s->sr_x = s->bl_x = s->br_x = s->all_x;
1439 if (s->all_y >= 0.f)
1440 s->fc_y = s->fl_y = s->fr_y = s->bc_y = s->sl_y = s->sr_y = s->bl_y = s->br_y = s->all_y;
1445 static int fft_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
1447 AudioSurroundContext *s = ctx->priv;
1448 const float level_in = s->input_levels[ch];
1452 memset(s->input->extended_data[ch] + s->buf_size * sizeof(float), 0, s->buf_size * sizeof(float));
1454 dst = (float *)s->input->extended_data[ch];
1455 for (n = 0; n < s->buf_size; n++) {
1456 dst[n] *= s->window_func_lut[n] * level_in;
1459 av_rdft_calc(s->rdft[ch], (float *)s->input->extended_data[ch]);
1464 static int ifft_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
1466 AudioSurroundContext *s = ctx->priv;
1467 const float level_out = s->output_levels[ch];
1472 av_rdft_calc(s->irdft[ch], (float *)s->output->extended_data[ch]);
1474 dst = (float *)s->output->extended_data[ch];
1475 ptr = (float *)s->overlap_buffer->extended_data[ch];
1477 memmove(s->overlap_buffer->extended_data[ch],
1478 s->overlap_buffer->extended_data[ch] + s->hop_size * sizeof(float),
1479 s->buf_size * sizeof(float));
1480 memset(s->overlap_buffer->extended_data[ch] + s->buf_size * sizeof(float),
1481 0, s->hop_size * sizeof(float));
1483 for (n = 0; n < s->buf_size; n++) {
1484 ptr[n] += dst[n] * s->window_func_lut[n] * level_out;
1487 ptr = (float *)s->overlap_buffer->extended_data[ch];
1488 dst = (float *)out->extended_data[ch];
1489 memcpy(dst, ptr, s->hop_size * sizeof(float));
1494 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
1496 AVFilterContext *ctx = inlink->dst;
1497 AVFilterLink *outlink = ctx->outputs[0];
1498 AudioSurroundContext *s = ctx->priv;
1501 ret = av_audio_fifo_write(s->fifo, (void **)in->extended_data,
1503 if (ret >= 0 && s->pts == AV_NOPTS_VALUE)
1510 while (av_audio_fifo_size(s->fifo) >= s->buf_size) {
1513 ret = av_audio_fifo_peek(s->fifo, (void **)s->input->extended_data, s->buf_size);
1517 ctx->internal->execute(ctx, fft_channel, NULL, NULL, inlink->channels);
1521 out = ff_get_audio_buffer(outlink, s->hop_size);
1523 return AVERROR(ENOMEM);
1525 ctx->internal->execute(ctx, ifft_channel, out, NULL, outlink->channels);
1528 if (s->pts != AV_NOPTS_VALUE)
1529 s->pts += av_rescale_q(out->nb_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
1530 av_audio_fifo_drain(s->fifo, s->hop_size);
1531 ret = ff_filter_frame(outlink, out);
1539 static int request_frame(AVFilterLink *outlink)
1541 AVFilterContext *ctx = outlink->src;
1542 AudioSurroundContext *s = ctx->priv;
1545 ret = ff_request_frame(ctx->inputs[0]);
1547 if (ret == AVERROR_EOF && av_audio_fifo_size(s->fifo) > 0 && av_audio_fifo_size(s->fifo) < s->buf_size) {
1550 in = ff_get_audio_buffer(outlink, s->buf_size - av_audio_fifo_size(s->fifo));
1552 return AVERROR(ENOMEM);
1553 ret = filter_frame(ctx->inputs[0], in);
1554 av_audio_fifo_drain(s->fifo, s->buf_size);
1560 static av_cold void uninit(AVFilterContext *ctx)
1562 AudioSurroundContext *s = ctx->priv;
1565 av_frame_free(&s->input);
1566 av_frame_free(&s->output);
1567 av_frame_free(&s->overlap_buffer);
1569 for (ch = 0; ch < s->nb_in_channels; ch++) {
1570 av_rdft_end(s->rdft[ch]);
1572 for (ch = 0; ch < s->nb_out_channels; ch++) {
1573 av_rdft_end(s->irdft[ch]);
1575 av_freep(&s->input_levels);
1576 av_freep(&s->output_levels);
1578 av_freep(&s->irdft);
1579 av_audio_fifo_free(s->fifo);
1580 av_freep(&s->window_func_lut);
1583 #define OFFSET(x) offsetof(AudioSurroundContext, x)
1584 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
1586 static const AVOption surround_options[] = {
1587 { "chl_out", "set output channel layout", OFFSET(out_channel_layout_str), AV_OPT_TYPE_STRING, {.str="5.1"}, 0, 0, FLAGS },
1588 { "chl_in", "set input channel layout", OFFSET(in_channel_layout_str), AV_OPT_TYPE_STRING, {.str="stereo"},0, 0, FLAGS },
1589 { "level_in", "set input level", OFFSET(level_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1590 { "level_out", "set output level", OFFSET(level_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1591 { "lfe", "output LFE", OFFSET(output_lfe), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
1592 { "lfe_low", "LFE low cut off", OFFSET(lowcutf), AV_OPT_TYPE_INT, {.i64=128}, 0, 256, FLAGS },
1593 { "lfe_high", "LFE high cut off", OFFSET(highcutf), AV_OPT_TYPE_INT, {.i64=256}, 0, 512, FLAGS },
1594 { "lfe_mode", "set LFE channel mode", OFFSET(lfe_mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "lfe_mode" },
1595 { "add", "just add LFE channel", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 1, FLAGS, "lfe_mode" },
1596 { "sub", "substract LFE channel with others", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 1, FLAGS, "lfe_mode" },
1597 { "fc_in", "set front center channel input level", OFFSET(fc_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1598 { "fc_out", "set front center channel output level", OFFSET(fc_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1599 { "lfe_in", "set lfe channel input level", OFFSET(lfe_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1600 { "lfe_out", "set lfe channel output level", OFFSET(lfe_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1601 { "allx", "set all channel's x spread", OFFSET(all_x), AV_OPT_TYPE_FLOAT, {.dbl=-1}, -1, 15, FLAGS },
1602 { "ally", "set all channel's y spread", OFFSET(all_y), AV_OPT_TYPE_FLOAT, {.dbl=-1}, -1, 15, FLAGS },
1603 { "fcx", "set front center channel x spread", OFFSET(fc_x), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1604 { "flx", "set front left channel x spread", OFFSET(fl_x), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1605 { "frx", "set front right channel x spread", OFFSET(fr_x), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1606 { "blx", "set back left channel x spread", OFFSET(bl_x), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1607 { "brx", "set back right channel x spread", OFFSET(br_x), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1608 { "slx", "set side left channel x spread", OFFSET(sl_x), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1609 { "srx", "set side right channel x spread", OFFSET(sr_x), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1610 { "bcx", "set back center channel x spread", OFFSET(bc_x), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1611 { "fcy", "set front center channel y spread", OFFSET(fc_y), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1612 { "fly", "set front left channel y spread", OFFSET(fl_y), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1613 { "fry", "set front right channel y spread", OFFSET(fr_y), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1614 { "bly", "set back left channel y spread", OFFSET(bl_y), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1615 { "bry", "set back right channel y spread", OFFSET(br_y), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1616 { "sly", "set side left channel y spread", OFFSET(sl_y), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1617 { "sry", "set side right channel y spread", OFFSET(sr_y), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1618 { "bcy", "set back center channel y spread", OFFSET(bc_y), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1619 { "win_size", "set window size", OFFSET(win_size), AV_OPT_TYPE_INT, {.i64 = 4096}, 1024, 65536, FLAGS },
1620 { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" },
1621 { "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, FLAGS, "win_func" },
1622 { "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" },
1623 { "hann", "Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" },
1624 { "hanning", "Hanning", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" },
1625 { "hamming", "Hamming", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING}, 0, 0, FLAGS, "win_func" },
1626 { "blackman", "Blackman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },
1627 { "welch", "Welch", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH}, 0, 0, FLAGS, "win_func" },
1628 { "flattop", "Flat-top", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP}, 0, 0, FLAGS, "win_func" },
1629 { "bharris", "Blackman-Harris", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS}, 0, 0, FLAGS, "win_func" },
1630 { "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" },
1631 { "bhann", "Bartlett-Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN}, 0, 0, FLAGS, "win_func" },
1632 { "sine", "Sine", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE}, 0, 0, FLAGS, "win_func" },
1633 { "nuttall", "Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL}, 0, 0, FLAGS, "win_func" },
1634 { "lanczos", "Lanczos", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS}, 0, 0, FLAGS, "win_func" },
1635 { "gauss", "Gauss", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS}, 0, 0, FLAGS, "win_func" },
1636 { "tukey", "Tukey", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY}, 0, 0, FLAGS, "win_func" },
1637 { "dolph", "Dolph-Chebyshev", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH}, 0, 0, FLAGS, "win_func" },
1638 { "cauchy", "Cauchy", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY}, 0, 0, FLAGS, "win_func" },
1639 { "parzen", "Parzen", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN}, 0, 0, FLAGS, "win_func" },
1640 { "poisson", "Poisson", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON}, 0, 0, FLAGS, "win_func" },
1641 { "bohman", "Bohman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BOHMAN}, 0, 0, FLAGS, "win_func" },
1642 { "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0, 1, FLAGS },
1646 AVFILTER_DEFINE_CLASS(surround);
1648 static const AVFilterPad inputs[] = {
1651 .type = AVMEDIA_TYPE_AUDIO,
1652 .filter_frame = filter_frame,
1653 .config_props = config_input,
1658 static const AVFilterPad outputs[] = {
1661 .type = AVMEDIA_TYPE_AUDIO,
1662 .request_frame = request_frame,
1663 .config_props = config_output,
1668 AVFilter ff_af_surround = {
1670 .description = NULL_IF_CONFIG_SMALL("Apply audio surround upmix filter."),
1671 .query_formats = query_formats,
1672 .priv_size = sizeof(AudioSurroundContext),
1673 .priv_class = &surround_class,
1678 .flags = AVFILTER_FLAG_SLICE_THREADS,