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"
30 #include "window_func.h"
32 typedef struct AudioSurroundContext {
35 char *out_channel_layout_str;
36 char *in_channel_layout_str;
94 uint64_t out_channel_layout;
95 uint64_t in_channel_layout;
101 AVFrame *overlap_buffer;
106 RDFTContext **rdft, **irdft;
107 float *window_func_lut;
112 void (*filter)(AVFilterContext *ctx);
113 void (*upmix_stereo)(AVFilterContext *ctx,
120 void (*upmix_2_1)(AVFilterContext *ctx,
129 void (*upmix_3_0)(AVFilterContext *ctx,
137 void (*upmix_5_0)(AVFilterContext *ctx,
138 float c_re, float c_im,
139 float mag_totall, float mag_totalr,
140 float fl_phase, float fr_phase,
141 float bl_phase, float br_phase,
142 float sl_phase, float sr_phase,
146 void (*upmix_5_1)(AVFilterContext *ctx,
147 float c_re, float c_im,
148 float lfe_re, float lfe_im,
149 float mag_totall, float mag_totalr,
150 float fl_phase, float fr_phase,
151 float bl_phase, float br_phase,
152 float sl_phase, float sr_phase,
156 } AudioSurroundContext;
158 static int query_formats(AVFilterContext *ctx)
160 AudioSurroundContext *s = ctx->priv;
161 AVFilterFormats *formats = NULL;
162 AVFilterChannelLayouts *layouts = NULL;
165 ret = ff_add_format(&formats, AV_SAMPLE_FMT_FLTP);
168 ret = ff_set_common_formats(ctx, formats);
173 ret = ff_add_channel_layout(&layouts, s->out_channel_layout);
177 ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts);
182 ret = ff_add_channel_layout(&layouts, s->in_channel_layout);
186 ret = ff_channel_layouts_ref(layouts, &ctx->inputs[0]->out_channel_layouts);
190 formats = ff_all_samplerates();
192 return AVERROR(ENOMEM);
193 return ff_set_common_samplerates(ctx, formats);
196 static int config_input(AVFilterLink *inlink)
198 AVFilterContext *ctx = inlink->dst;
199 AudioSurroundContext *s = ctx->priv;
202 s->rdft = av_calloc(inlink->channels, sizeof(*s->rdft));
204 return AVERROR(ENOMEM);
206 for (ch = 0; ch < inlink->channels; ch++) {
207 s->rdft[ch] = av_rdft_init(ff_log2(s->buf_size), DFT_R2C);
209 return AVERROR(ENOMEM);
211 s->nb_in_channels = inlink->channels;
212 s->input_levels = av_malloc_array(s->nb_in_channels, sizeof(*s->input_levels));
213 if (!s->input_levels)
214 return AVERROR(ENOMEM);
215 for (ch = 0; ch < s->nb_in_channels; ch++)
216 s->input_levels[ch] = s->level_in;
217 ch = av_get_channel_layout_channel_index(inlink->channel_layout, AV_CH_FRONT_CENTER);
219 s->input_levels[ch] *= s->fc_in;
220 ch = av_get_channel_layout_channel_index(inlink->channel_layout, AV_CH_FRONT_LEFT);
222 s->input_levels[ch] *= s->fl_in;
223 ch = av_get_channel_layout_channel_index(inlink->channel_layout, AV_CH_FRONT_RIGHT);
225 s->input_levels[ch] *= s->fr_in;
226 ch = av_get_channel_layout_channel_index(inlink->channel_layout, AV_CH_SIDE_LEFT);
228 s->input_levels[ch] *= s->sl_in;
229 ch = av_get_channel_layout_channel_index(inlink->channel_layout, AV_CH_SIDE_RIGHT);
231 s->input_levels[ch] *= s->sr_in;
232 ch = av_get_channel_layout_channel_index(inlink->channel_layout, AV_CH_BACK_LEFT);
234 s->input_levels[ch] *= s->bl_in;
235 ch = av_get_channel_layout_channel_index(inlink->channel_layout, AV_CH_BACK_RIGHT);
237 s->input_levels[ch] *= s->br_in;
238 ch = av_get_channel_layout_channel_index(inlink->channel_layout, AV_CH_BACK_CENTER);
240 s->input_levels[ch] *= s->bc_in;
241 ch = av_get_channel_layout_channel_index(inlink->channel_layout, AV_CH_LOW_FREQUENCY);
243 s->input_levels[ch] *= s->lfe_in;
245 s->input = ff_get_audio_buffer(inlink, s->buf_size * 2);
247 return AVERROR(ENOMEM);
249 s->fifo = av_audio_fifo_alloc(inlink->format, inlink->channels, s->buf_size);
251 return AVERROR(ENOMEM);
253 s->lowcut = 1.f * s->lowcutf / (inlink->sample_rate * 0.5) * (s->buf_size / 2);
254 s->highcut = 1.f * s->highcutf / (inlink->sample_rate * 0.5) * (s->buf_size / 2);
259 static int config_output(AVFilterLink *outlink)
261 AVFilterContext *ctx = outlink->src;
262 AudioSurroundContext *s = ctx->priv;
265 s->irdft = av_calloc(outlink->channels, sizeof(*s->irdft));
267 return AVERROR(ENOMEM);
269 for (ch = 0; ch < outlink->channels; ch++) {
270 s->irdft[ch] = av_rdft_init(ff_log2(s->buf_size), IDFT_C2R);
272 return AVERROR(ENOMEM);
274 s->nb_out_channels = outlink->channels;
275 s->output_levels = av_malloc_array(s->nb_out_channels, sizeof(*s->output_levels));
276 if (!s->output_levels)
277 return AVERROR(ENOMEM);
278 for (ch = 0; ch < s->nb_out_channels; ch++)
279 s->output_levels[ch] = s->level_out;
280 ch = av_get_channel_layout_channel_index(outlink->channel_layout, AV_CH_FRONT_CENTER);
282 s->output_levels[ch] *= s->fc_out;
283 ch = av_get_channel_layout_channel_index(outlink->channel_layout, AV_CH_FRONT_LEFT);
285 s->output_levels[ch] *= s->fl_out;
286 ch = av_get_channel_layout_channel_index(outlink->channel_layout, AV_CH_FRONT_RIGHT);
288 s->output_levels[ch] *= s->fr_out;
289 ch = av_get_channel_layout_channel_index(outlink->channel_layout, AV_CH_SIDE_LEFT);
291 s->output_levels[ch] *= s->sl_out;
292 ch = av_get_channel_layout_channel_index(outlink->channel_layout, AV_CH_SIDE_RIGHT);
294 s->output_levels[ch] *= s->sr_out;
295 ch = av_get_channel_layout_channel_index(outlink->channel_layout, AV_CH_BACK_LEFT);
297 s->output_levels[ch] *= s->bl_out;
298 ch = av_get_channel_layout_channel_index(outlink->channel_layout, AV_CH_BACK_RIGHT);
300 s->output_levels[ch] *= s->br_out;
301 ch = av_get_channel_layout_channel_index(outlink->channel_layout, AV_CH_BACK_CENTER);
303 s->output_levels[ch] *= s->bc_out;
304 ch = av_get_channel_layout_channel_index(outlink->channel_layout, AV_CH_LOW_FREQUENCY);
306 s->output_levels[ch] *= s->lfe_out;
308 s->output = ff_get_audio_buffer(outlink, s->buf_size * 2);
309 s->overlap_buffer = ff_get_audio_buffer(outlink, s->buf_size * 2);
310 if (!s->overlap_buffer || !s->output)
311 return AVERROR(ENOMEM);
316 static void stereo_transform(float *x, float *y, float angle)
318 float reference, r, a;
323 reference = angle * M_PI / 180.f;
327 if (fabsf(a) <= M_PI_4)
328 a *= reference / M_PI_2;
330 a = M_PI + 2 * (-2 * M_PI + reference) * (M_PI - fabsf(a)) * FFDIFFSIGN(a, 0) / (3 * M_PI);
332 *x = av_clipf(sinf(a) * r, -1, 1);
333 *y = av_clipf(cosf(a) * r, -1, 1);
336 static void stereo_position(float a, float p, float *x, float *y)
338 *x = av_clipf(a+FFMAX(0, sinf(p-M_PI_2))*FFDIFFSIGN(a,0), -1, 1);
339 *y = av_clipf(cosf(a*M_PI_2+M_PI)*cosf(M_PI_2-p/M_PI)*M_LN10+1, -1, 1);
342 static inline void get_lfe(int output_lfe, int n, float lowcut, float highcut,
343 float *lfe_mag, float *mag_total, int lfe_mode)
345 if (output_lfe && n < highcut) {
346 *lfe_mag = n < lowcut ? 1.f : .5f*(1.f+cosf(M_PI*(lowcut-n)/(lowcut-highcut)));
347 *lfe_mag *= *mag_total;
349 *mag_total -= *lfe_mag;
355 static void upmix_1_0(AVFilterContext *ctx,
363 AudioSurroundContext *s = ctx->priv;
366 dst = (float *)s->output->extended_data[0];
368 mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
370 dst[2 * n ] = mag * cosf(c_phase);
371 dst[2 * n + 1] = mag * sinf(c_phase);
374 static void upmix_stereo(AVFilterContext *ctx,
382 AudioSurroundContext *s = ctx->priv;
383 float l_mag, r_mag, *dstl, *dstr;
385 dstl = (float *)s->output->extended_data[0];
386 dstr = (float *)s->output->extended_data[1];
388 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
389 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
391 dstl[2 * n ] = l_mag * cosf(l_phase);
392 dstl[2 * n + 1] = l_mag * sinf(l_phase);
394 dstr[2 * n ] = r_mag * cosf(r_phase);
395 dstr[2 * n + 1] = r_mag * sinf(r_phase);
398 static void upmix_2_1(AVFilterContext *ctx,
406 AudioSurroundContext *s = ctx->priv;
407 float lfe_mag, l_mag, r_mag, *dstl, *dstr, *dstlfe;
409 dstl = (float *)s->output->extended_data[0];
410 dstr = (float *)s->output->extended_data[1];
411 dstlfe = (float *)s->output->extended_data[2];
413 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total, s->lfe_mode);
415 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
416 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
418 dstl[2 * n ] = l_mag * cosf(l_phase);
419 dstl[2 * n + 1] = l_mag * sinf(l_phase);
421 dstr[2 * n ] = r_mag * cosf(r_phase);
422 dstr[2 * n + 1] = r_mag * sinf(r_phase);
424 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
425 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
428 static void upmix_3_0(AVFilterContext *ctx,
436 AudioSurroundContext *s = ctx->priv;
437 float l_mag, r_mag, c_mag, *dstc, *dstl, *dstr;
439 dstl = (float *)s->output->extended_data[0];
440 dstr = (float *)s->output->extended_data[1];
441 dstc = (float *)s->output->extended_data[2];
443 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
444 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
445 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
447 dstl[2 * n ] = l_mag * cosf(l_phase);
448 dstl[2 * n + 1] = l_mag * sinf(l_phase);
450 dstr[2 * n ] = r_mag * cosf(r_phase);
451 dstr[2 * n + 1] = r_mag * sinf(r_phase);
453 dstc[2 * n ] = c_mag * cosf(c_phase);
454 dstc[2 * n + 1] = c_mag * sinf(c_phase);
457 static void upmix_3_1(AVFilterContext *ctx,
465 AudioSurroundContext *s = ctx->priv;
466 float lfe_mag, l_mag, r_mag, c_mag, *dstc, *dstl, *dstr, *dstlfe;
468 dstl = (float *)s->output->extended_data[0];
469 dstr = (float *)s->output->extended_data[1];
470 dstc = (float *)s->output->extended_data[2];
471 dstlfe = (float *)s->output->extended_data[3];
473 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total, s->lfe_mode);
475 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
476 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
477 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
479 dstl[2 * n ] = l_mag * cosf(l_phase);
480 dstl[2 * n + 1] = l_mag * sinf(l_phase);
482 dstr[2 * n ] = r_mag * cosf(r_phase);
483 dstr[2 * n + 1] = r_mag * sinf(r_phase);
485 dstc[2 * n ] = c_mag * cosf(c_phase);
486 dstc[2 * n + 1] = c_mag * sinf(c_phase);
488 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
489 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
492 static void upmix_3_1_surround(AVFilterContext *ctx,
501 AudioSurroundContext *s = ctx->priv;
502 float lfe_mag, l_mag, r_mag, *dstc, *dstl, *dstr, *dstlfe;
504 dstl = (float *)s->output->extended_data[0];
505 dstr = (float *)s->output->extended_data[1];
506 dstc = (float *)s->output->extended_data[2];
507 dstlfe = (float *)s->output->extended_data[3];
509 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &c_mag, s->lfe_mode);
511 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
512 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
514 dstl[2 * n ] = l_mag * cosf(l_phase);
515 dstl[2 * n + 1] = l_mag * sinf(l_phase);
517 dstr[2 * n ] = r_mag * cosf(r_phase);
518 dstr[2 * n + 1] = r_mag * sinf(r_phase);
520 dstc[2 * n ] = c_mag * cosf(c_phase);
521 dstc[2 * n + 1] = c_mag * sinf(c_phase);
523 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
524 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
527 static void upmix_4_0(AVFilterContext *ctx,
535 AudioSurroundContext *s = ctx->priv;
536 float b_mag, l_mag, r_mag, c_mag, *dstc, *dstl, *dstr, *dstb;
538 dstl = (float *)s->output->extended_data[0];
539 dstr = (float *)s->output->extended_data[1];
540 dstc = (float *)s->output->extended_data[2];
541 dstb = (float *)s->output->extended_data[3];
543 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
544 b_mag = powf(1.f - fabsf(x), s->bc_x) * powf((1.f - y) * .5f, s->bc_y) * mag_total;
545 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
546 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
548 dstl[2 * n ] = l_mag * cosf(l_phase);
549 dstl[2 * n + 1] = l_mag * sinf(l_phase);
551 dstr[2 * n ] = r_mag * cosf(r_phase);
552 dstr[2 * n + 1] = r_mag * sinf(r_phase);
554 dstc[2 * n ] = c_mag * cosf(c_phase);
555 dstc[2 * n + 1] = c_mag * sinf(c_phase);
557 dstb[2 * n ] = b_mag * cosf(c_phase);
558 dstb[2 * n + 1] = b_mag * sinf(c_phase);
561 static void upmix_4_1(AVFilterContext *ctx,
569 AudioSurroundContext *s = ctx->priv;
570 float lfe_mag, b_mag, l_mag, r_mag, c_mag, *dstc, *dstl, *dstr, *dstb, *dstlfe;
572 dstl = (float *)s->output->extended_data[0];
573 dstr = (float *)s->output->extended_data[1];
574 dstc = (float *)s->output->extended_data[2];
575 dstlfe = (float *)s->output->extended_data[3];
576 dstb = (float *)s->output->extended_data[4];
578 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total, s->lfe_mode);
580 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
581 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
583 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
584 b_mag = powf(1.f - fabsf(x), s->bc_x) * powf((1.f - y) * .5f, s->bc_y) * mag_total;
585 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
586 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
588 dstl[2 * n ] = l_mag * cosf(l_phase);
589 dstl[2 * n + 1] = l_mag * sinf(l_phase);
591 dstr[2 * n ] = r_mag * cosf(r_phase);
592 dstr[2 * n + 1] = r_mag * sinf(r_phase);
594 dstc[2 * n ] = c_mag * cosf(c_phase);
595 dstc[2 * n + 1] = c_mag * sinf(c_phase);
597 dstb[2 * n ] = b_mag * cosf(c_phase);
598 dstb[2 * n + 1] = b_mag * sinf(c_phase);
601 static void upmix_5_0_back(AVFilterContext *ctx,
609 AudioSurroundContext *s = ctx->priv;
610 float l_mag, r_mag, ls_mag, rs_mag, c_mag, *dstc, *dstl, *dstr, *dstls, *dstrs;
612 dstl = (float *)s->output->extended_data[0];
613 dstr = (float *)s->output->extended_data[1];
614 dstc = (float *)s->output->extended_data[2];
615 dstls = (float *)s->output->extended_data[3];
616 dstrs = (float *)s->output->extended_data[4];
618 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
619 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
620 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
621 ls_mag = powf(.5f * ( x + 1.f), s->bl_x) * powf(1.f - ((y + 1.f) * .5f), s->bl_y) * mag_total;
622 rs_mag = powf(.5f * (-x + 1.f), s->br_x) * powf(1.f - ((y + 1.f) * .5f), s->br_y) * mag_total;
624 dstl[2 * n ] = l_mag * cosf(l_phase);
625 dstl[2 * n + 1] = l_mag * sinf(l_phase);
627 dstr[2 * n ] = r_mag * cosf(r_phase);
628 dstr[2 * n + 1] = r_mag * sinf(r_phase);
630 dstc[2 * n ] = c_mag * cosf(c_phase);
631 dstc[2 * n + 1] = c_mag * sinf(c_phase);
633 dstls[2 * n ] = ls_mag * cosf(l_phase);
634 dstls[2 * n + 1] = ls_mag * sinf(l_phase);
636 dstrs[2 * n ] = rs_mag * cosf(r_phase);
637 dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
640 static void upmix_5_1_back(AVFilterContext *ctx,
648 AudioSurroundContext *s = ctx->priv;
649 float lfe_mag, l_mag, r_mag, ls_mag, rs_mag, c_mag, *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlfe;
651 dstl = (float *)s->output->extended_data[0];
652 dstr = (float *)s->output->extended_data[1];
653 dstc = (float *)s->output->extended_data[2];
654 dstlfe = (float *)s->output->extended_data[3];
655 dstls = (float *)s->output->extended_data[4];
656 dstrs = (float *)s->output->extended_data[5];
658 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total, s->lfe_mode);
660 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
661 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
662 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
663 ls_mag = powf(.5f * ( x + 1.f), s->bl_x) * powf(1.f - ((y + 1.f) * .5f), s->bl_y) * mag_total;
664 rs_mag = powf(.5f * (-x + 1.f), s->br_x) * powf(1.f - ((y + 1.f) * .5f), s->br_y) * mag_total;
666 dstl[2 * n ] = l_mag * cosf(l_phase);
667 dstl[2 * n + 1] = l_mag * sinf(l_phase);
669 dstr[2 * n ] = r_mag * cosf(r_phase);
670 dstr[2 * n + 1] = r_mag * sinf(r_phase);
672 dstc[2 * n ] = c_mag * cosf(c_phase);
673 dstc[2 * n + 1] = c_mag * sinf(c_phase);
675 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
676 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
678 dstls[2 * n ] = ls_mag * cosf(l_phase);
679 dstls[2 * n + 1] = ls_mag * sinf(l_phase);
681 dstrs[2 * n ] = rs_mag * cosf(r_phase);
682 dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
685 static void upmix_6_0(AVFilterContext *ctx,
693 AudioSurroundContext *s = ctx->priv;
694 float l_mag, r_mag, ls_mag, rs_mag, c_mag, b_mag, *dstc, *dstb, *dstl, *dstr, *dstls, *dstrs;
696 dstl = (float *)s->output->extended_data[0];
697 dstr = (float *)s->output->extended_data[1];
698 dstc = (float *)s->output->extended_data[2];
699 dstb = (float *)s->output->extended_data[3];
700 dstls = (float *)s->output->extended_data[4];
701 dstrs = (float *)s->output->extended_data[5];
703 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
704 b_mag = powf(1.f - fabsf(x), s->bc_x) * powf((1.f - y) * .5f, s->bc_y) * mag_total;
705 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
706 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
707 ls_mag = powf(.5f * ( x + 1.f), s->bl_x) * powf(1.f - ((y + 1.f) * .5f), s->bl_y) * mag_total;
708 rs_mag = powf(.5f * (-x + 1.f), s->br_x) * powf(1.f - ((y + 1.f) * .5f), s->br_y) * mag_total;
710 dstl[2 * n ] = l_mag * cosf(l_phase);
711 dstl[2 * n + 1] = l_mag * sinf(l_phase);
713 dstr[2 * n ] = r_mag * cosf(r_phase);
714 dstr[2 * n + 1] = r_mag * sinf(r_phase);
716 dstc[2 * n ] = c_mag * cosf(c_phase);
717 dstc[2 * n + 1] = c_mag * sinf(c_phase);
719 dstls[2 * n ] = ls_mag * cosf(l_phase);
720 dstls[2 * n + 1] = ls_mag * sinf(l_phase);
722 dstrs[2 * n ] = rs_mag * cosf(r_phase);
723 dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
725 dstb[2 * n ] = b_mag * cosf(c_phase);
726 dstb[2 * n + 1] = b_mag * sinf(c_phase);
729 static void upmix_6_1(AVFilterContext *ctx,
737 AudioSurroundContext *s = ctx->priv;
738 float lfe_mag, l_mag, r_mag, ls_mag, rs_mag, c_mag, b_mag, *dstc, *dstb, *dstl, *dstr, *dstls, *dstrs, *dstlfe;
740 dstl = (float *)s->output->extended_data[0];
741 dstr = (float *)s->output->extended_data[1];
742 dstc = (float *)s->output->extended_data[2];
743 dstlfe = (float *)s->output->extended_data[3];
744 dstb = (float *)s->output->extended_data[4];
745 dstls = (float *)s->output->extended_data[5];
746 dstrs = (float *)s->output->extended_data[6];
748 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total, s->lfe_mode);
750 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
751 b_mag = powf(1.f - fabsf(x), s->bc_x) * powf((1.f - y) * .5f, s->bc_y) * mag_total;
752 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
753 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
754 ls_mag = powf(.5f * ( x + 1.f), s->bl_x) * powf(1.f - ((y + 1.f) * .5f), s->bl_y) * mag_total;
755 rs_mag = powf(.5f * (-x + 1.f), s->br_x) * powf(1.f - ((y + 1.f) * .5f), s->br_y) * mag_total;
757 dstl[2 * n ] = l_mag * cosf(l_phase);
758 dstl[2 * n + 1] = l_mag * sinf(l_phase);
760 dstr[2 * n ] = r_mag * cosf(r_phase);
761 dstr[2 * n + 1] = r_mag * sinf(r_phase);
763 dstc[2 * n ] = c_mag * cosf(c_phase);
764 dstc[2 * n + 1] = c_mag * sinf(c_phase);
766 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
767 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
769 dstls[2 * n ] = ls_mag * cosf(l_phase);
770 dstls[2 * n + 1] = ls_mag * sinf(l_phase);
772 dstrs[2 * n ] = rs_mag * cosf(r_phase);
773 dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
775 dstb[2 * n ] = b_mag * cosf(c_phase);
776 dstb[2 * n + 1] = b_mag * sinf(c_phase);
779 static void upmix_5_1_back_surround(AVFilterContext *ctx,
788 AudioSurroundContext *s = ctx->priv;
789 float lfe_mag, l_mag, r_mag, *dstc, *dstl, *dstr, *dstlfe;
790 float ls_mag, rs_mag, *dstls, *dstrs;
792 dstl = (float *)s->output->extended_data[0];
793 dstr = (float *)s->output->extended_data[1];
794 dstc = (float *)s->output->extended_data[2];
795 dstlfe = (float *)s->output->extended_data[3];
796 dstls = (float *)s->output->extended_data[4];
797 dstrs = (float *)s->output->extended_data[5];
799 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &c_mag, s->lfe_mode);
801 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
802 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
803 ls_mag = powf(.5f * ( x + 1.f), s->bl_x) * powf(1.f - ((y + 1.f) * .5f), s->bl_y) * mag_total;
804 rs_mag = powf(.5f * (-x + 1.f), s->br_x) * powf(1.f - ((y + 1.f) * .5f), s->br_y) * mag_total;
806 dstl[2 * n ] = l_mag * cosf(l_phase);
807 dstl[2 * n + 1] = l_mag * sinf(l_phase);
809 dstr[2 * n ] = r_mag * cosf(r_phase);
810 dstr[2 * n + 1] = r_mag * sinf(r_phase);
812 dstc[2 * n ] = c_mag * cosf(c_phase);
813 dstc[2 * n + 1] = c_mag * sinf(c_phase);
815 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
816 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
818 dstls[2 * n ] = ls_mag * cosf(l_phase);
819 dstls[2 * n + 1] = ls_mag * sinf(l_phase);
821 dstrs[2 * n ] = rs_mag * cosf(r_phase);
822 dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
825 static void upmix_5_1_back_2_1(AVFilterContext *ctx,
835 AudioSurroundContext *s = ctx->priv;
836 float c_mag, l_mag, r_mag, *dstc, *dstl, *dstr, *dstlfe;
837 float ls_mag, rs_mag, *dstls, *dstrs;
839 dstl = (float *)s->output->extended_data[0];
840 dstr = (float *)s->output->extended_data[1];
841 dstc = (float *)s->output->extended_data[2];
842 dstlfe = (float *)s->output->extended_data[3];
843 dstls = (float *)s->output->extended_data[4];
844 dstrs = (float *)s->output->extended_data[5];
846 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
847 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
848 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
849 ls_mag = powf(.5f * ( x + 1.f), s->bl_x) * powf(1.f - ((y + 1.f) * .5f), s->bl_y) * mag_total;
850 rs_mag = powf(.5f * (-x + 1.f), s->br_x) * powf(1.f - ((y + 1.f) * .5f), s->br_y) * mag_total;
852 dstl[2 * n ] = l_mag * cosf(l_phase);
853 dstl[2 * n + 1] = l_mag * sinf(l_phase);
855 dstr[2 * n ] = r_mag * cosf(r_phase);
856 dstr[2 * n + 1] = r_mag * sinf(r_phase);
858 dstc[2 * n ] = c_mag * cosf(c_phase);
859 dstc[2 * n + 1] = c_mag * sinf(c_phase);
861 dstlfe[2 * n ] = lfe_re;
862 dstlfe[2 * n + 1] = lfe_im;
864 dstls[2 * n ] = ls_mag * cosf(l_phase);
865 dstls[2 * n + 1] = ls_mag * sinf(l_phase);
867 dstrs[2 * n ] = rs_mag * cosf(r_phase);
868 dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
871 static void upmix_7_0(AVFilterContext *ctx,
879 float l_mag, r_mag, ls_mag, rs_mag, c_mag, lb_mag, rb_mag;
880 float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb;
881 AudioSurroundContext *s = ctx->priv;
883 dstl = (float *)s->output->extended_data[0];
884 dstr = (float *)s->output->extended_data[1];
885 dstc = (float *)s->output->extended_data[2];
886 dstlb = (float *)s->output->extended_data[3];
887 dstrb = (float *)s->output->extended_data[4];
888 dstls = (float *)s->output->extended_data[5];
889 dstrs = (float *)s->output->extended_data[6];
891 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
892 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
893 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
894 lb_mag = powf(.5f * ( x + 1.f), s->bl_x) * powf(1.f - ((y + 1.f) * .5f), s->bl_y) * mag_total;
895 rb_mag = powf(.5f * (-x + 1.f), s->br_x) * powf(1.f - ((y + 1.f) * .5f), s->br_y) * mag_total;
896 ls_mag = powf(.5f * ( x + 1.f), s->sl_x) * powf(1.f - fabsf(y), s->sl_y) * mag_total;
897 rs_mag = powf(.5f * (-x + 1.f), s->sr_x) * powf(1.f - fabsf(y), s->sr_y) * mag_total;
899 dstl[2 * n ] = l_mag * cosf(l_phase);
900 dstl[2 * n + 1] = l_mag * sinf(l_phase);
902 dstr[2 * n ] = r_mag * cosf(r_phase);
903 dstr[2 * n + 1] = r_mag * sinf(r_phase);
905 dstc[2 * n ] = c_mag * cosf(c_phase);
906 dstc[2 * n + 1] = c_mag * sinf(c_phase);
908 dstlb[2 * n ] = lb_mag * cosf(l_phase);
909 dstlb[2 * n + 1] = lb_mag * sinf(l_phase);
911 dstrb[2 * n ] = rb_mag * cosf(r_phase);
912 dstrb[2 * n + 1] = rb_mag * sinf(r_phase);
914 dstls[2 * n ] = ls_mag * cosf(l_phase);
915 dstls[2 * n + 1] = ls_mag * sinf(l_phase);
917 dstrs[2 * n ] = rs_mag * cosf(r_phase);
918 dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
921 static void upmix_7_1(AVFilterContext *ctx,
929 float lfe_mag, l_mag, r_mag, ls_mag, rs_mag, c_mag, lb_mag, rb_mag;
930 float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb, *dstlfe;
931 AudioSurroundContext *s = ctx->priv;
933 dstl = (float *)s->output->extended_data[0];
934 dstr = (float *)s->output->extended_data[1];
935 dstc = (float *)s->output->extended_data[2];
936 dstlfe = (float *)s->output->extended_data[3];
937 dstlb = (float *)s->output->extended_data[4];
938 dstrb = (float *)s->output->extended_data[5];
939 dstls = (float *)s->output->extended_data[6];
940 dstrs = (float *)s->output->extended_data[7];
942 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total, s->lfe_mode);
944 c_mag = powf(1.f - fabsf(x), s->fc_x) * powf((y + 1.f) * .5f, s->fc_y) * mag_total;
945 l_mag = powf(.5f * ( x + 1.f), s->fl_x) * powf((y + 1.f) * .5f, s->fl_y) * mag_total;
946 r_mag = powf(.5f * (-x + 1.f), s->fr_x) * powf((y + 1.f) * .5f, s->fr_y) * mag_total;
947 lb_mag = powf(.5f * ( x + 1.f), s->bl_x) * powf(1.f - ((y + 1.f) * .5f), s->bl_y) * mag_total;
948 rb_mag = powf(.5f * (-x + 1.f), s->br_x) * powf(1.f - ((y + 1.f) * .5f), s->br_y) * mag_total;
949 ls_mag = powf(.5f * ( x + 1.f), s->sl_x) * powf(1.f - fabsf(y), s->sl_y) * mag_total;
950 rs_mag = powf(.5f * (-x + 1.f), s->sr_x) * powf(1.f - fabsf(y), s->sr_y) * mag_total;
952 dstl[2 * n ] = l_mag * cosf(l_phase);
953 dstl[2 * n + 1] = l_mag * sinf(l_phase);
955 dstr[2 * n ] = r_mag * cosf(r_phase);
956 dstr[2 * n + 1] = r_mag * sinf(r_phase);
958 dstc[2 * n ] = c_mag * cosf(c_phase);
959 dstc[2 * n + 1] = c_mag * sinf(c_phase);
961 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
962 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
964 dstlb[2 * n ] = lb_mag * cosf(l_phase);
965 dstlb[2 * n + 1] = lb_mag * sinf(l_phase);
967 dstrb[2 * n ] = rb_mag * cosf(r_phase);
968 dstrb[2 * n + 1] = rb_mag * sinf(r_phase);
970 dstls[2 * n ] = ls_mag * cosf(l_phase);
971 dstls[2 * n + 1] = ls_mag * sinf(l_phase);
973 dstrs[2 * n ] = rs_mag * cosf(r_phase);
974 dstrs[2 * n + 1] = rs_mag * sinf(r_phase);
977 static void upmix_7_1_5_0_side(AVFilterContext *ctx,
978 float c_re, float c_im,
979 float mag_totall, float mag_totalr,
980 float fl_phase, float fr_phase,
981 float bl_phase, float br_phase,
982 float sl_phase, float sr_phase,
987 float fl_mag, fr_mag, ls_mag, rs_mag, lb_mag, rb_mag;
988 float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb, *dstlfe;
989 float lfe_mag, c_phase, mag_total = (mag_totall + mag_totalr) * 0.5;
990 AudioSurroundContext *s = ctx->priv;
992 dstl = (float *)s->output->extended_data[0];
993 dstr = (float *)s->output->extended_data[1];
994 dstc = (float *)s->output->extended_data[2];
995 dstlfe = (float *)s->output->extended_data[3];
996 dstlb = (float *)s->output->extended_data[4];
997 dstrb = (float *)s->output->extended_data[5];
998 dstls = (float *)s->output->extended_data[6];
999 dstrs = (float *)s->output->extended_data[7];
1001 c_phase = atan2f(c_im, c_re);
1003 get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, &mag_total, s->lfe_mode);
1005 fl_mag = powf(.5f * (xl + 1.f), s->fl_x) * powf((yl + 1.f) * .5f, s->fl_y) * mag_totall;
1006 fr_mag = powf(.5f * (xr + 1.f), s->fr_x) * powf((yr + 1.f) * .5f, s->fr_y) * mag_totalr;
1007 lb_mag = powf(.5f * (-xl + 1.f), s->bl_x) * powf((yl + 1.f) * .5f, s->bl_y) * mag_totall;
1008 rb_mag = powf(.5f * (-xr + 1.f), s->br_x) * powf((yr + 1.f) * .5f, s->br_y) * mag_totalr;
1009 ls_mag = powf(1.f - fabsf(xl), s->sl_x) * powf((yl + 1.f) * .5f, s->sl_y) * mag_totall;
1010 rs_mag = powf(1.f - fabsf(xr), s->sr_x) * powf((yr + 1.f) * .5f, s->sr_y) * mag_totalr;
1012 dstl[2 * n ] = fl_mag * cosf(fl_phase);
1013 dstl[2 * n + 1] = fl_mag * sinf(fl_phase);
1015 dstr[2 * n ] = fr_mag * cosf(fr_phase);
1016 dstr[2 * n + 1] = fr_mag * sinf(fr_phase);
1018 dstc[2 * n ] = c_re;
1019 dstc[2 * n + 1] = c_im;
1021 dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
1022 dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
1024 dstlb[2 * n ] = lb_mag * cosf(bl_phase);
1025 dstlb[2 * n + 1] = lb_mag * sinf(bl_phase);
1027 dstrb[2 * n ] = rb_mag * cosf(br_phase);
1028 dstrb[2 * n + 1] = rb_mag * sinf(br_phase);
1030 dstls[2 * n ] = ls_mag * cosf(sl_phase);
1031 dstls[2 * n + 1] = ls_mag * sinf(sl_phase);
1033 dstrs[2 * n ] = rs_mag * cosf(sr_phase);
1034 dstrs[2 * n + 1] = rs_mag * sinf(sr_phase);
1037 static void upmix_7_1_5_1(AVFilterContext *ctx,
1038 float c_re, float c_im,
1039 float lfe_re, float lfe_im,
1040 float mag_totall, float mag_totalr,
1041 float fl_phase, float fr_phase,
1042 float bl_phase, float br_phase,
1043 float sl_phase, float sr_phase,
1048 float fl_mag, fr_mag, ls_mag, rs_mag, lb_mag, rb_mag;
1049 float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb, *dstlfe;
1050 AudioSurroundContext *s = ctx->priv;
1052 dstl = (float *)s->output->extended_data[0];
1053 dstr = (float *)s->output->extended_data[1];
1054 dstc = (float *)s->output->extended_data[2];
1055 dstlfe = (float *)s->output->extended_data[3];
1056 dstlb = (float *)s->output->extended_data[4];
1057 dstrb = (float *)s->output->extended_data[5];
1058 dstls = (float *)s->output->extended_data[6];
1059 dstrs = (float *)s->output->extended_data[7];
1061 fl_mag = powf(.5f * (xl + 1.f), s->fl_x) * powf((yl + 1.f) * .5f, s->fl_y) * mag_totall;
1062 fr_mag = powf(.5f * (xr + 1.f), s->fr_x) * powf((yr + 1.f) * .5f, s->fr_y) * mag_totalr;
1063 lb_mag = powf(.5f * (-xl + 1.f), s->bl_x) * powf((yl + 1.f) * .5f, s->bl_y) * mag_totall;
1064 rb_mag = powf(.5f * (-xr + 1.f), s->br_x) * powf((yr + 1.f) * .5f, s->br_y) * mag_totalr;
1065 ls_mag = powf(1.f - fabsf(xl), s->sl_x) * powf((yl + 1.f) * .5f, s->sl_y) * mag_totall;
1066 rs_mag = powf(1.f - fabsf(xr), s->sr_x) * powf((yr + 1.f) * .5f, s->sr_y) * mag_totalr;
1068 dstl[2 * n ] = fl_mag * cosf(fl_phase);
1069 dstl[2 * n + 1] = fl_mag * sinf(fl_phase);
1071 dstr[2 * n ] = fr_mag * cosf(fr_phase);
1072 dstr[2 * n + 1] = fr_mag * sinf(fr_phase);
1074 dstc[2 * n ] = c_re;
1075 dstc[2 * n + 1] = c_im;
1077 dstlfe[2 * n ] = lfe_re;
1078 dstlfe[2 * n + 1] = lfe_im;
1080 dstlb[2 * n ] = lb_mag * cosf(bl_phase);
1081 dstlb[2 * n + 1] = lb_mag * sinf(bl_phase);
1083 dstrb[2 * n ] = rb_mag * cosf(br_phase);
1084 dstrb[2 * n + 1] = rb_mag * sinf(br_phase);
1086 dstls[2 * n ] = ls_mag * cosf(sl_phase);
1087 dstls[2 * n + 1] = ls_mag * sinf(sl_phase);
1089 dstrs[2 * n ] = rs_mag * cosf(sr_phase);
1090 dstrs[2 * n + 1] = rs_mag * sinf(sr_phase);
1093 static void filter_stereo(AVFilterContext *ctx)
1095 AudioSurroundContext *s = ctx->priv;
1099 srcl = (float *)s->input->extended_data[0];
1100 srcr = (float *)s->input->extended_data[1];
1102 for (n = 0; n < s->buf_size; n++) {
1103 float l_re = srcl[2 * n], r_re = srcr[2 * n];
1104 float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
1105 float c_phase = atan2f(l_im + r_im, l_re + r_re);
1106 float l_mag = hypotf(l_re, l_im);
1107 float r_mag = hypotf(r_re, r_im);
1108 float l_phase = atan2f(l_im, l_re);
1109 float r_phase = atan2f(r_im, r_re);
1110 float phase_dif = fabsf(l_phase - r_phase);
1111 float mag_sum = l_mag + r_mag;
1112 float mag_dif = mag_sum < 0.000001 ? 0.f : (l_mag - r_mag) / mag_sum;
1113 float mag_total = hypotf(l_mag, r_mag);
1116 if (phase_dif > M_PI)
1117 phase_dif = 2 * M_PI - phase_dif;
1119 stereo_position(mag_dif, phase_dif, &x, &y);
1120 stereo_transform(&x, &y, s->angle);
1122 s->upmix_stereo(ctx, l_phase, r_phase, c_phase, mag_total, x, y, n);
1126 static void filter_surround(AVFilterContext *ctx)
1128 AudioSurroundContext *s = ctx->priv;
1129 float *srcl, *srcr, *srcc;
1132 srcl = (float *)s->input->extended_data[0];
1133 srcr = (float *)s->input->extended_data[1];
1134 srcc = (float *)s->input->extended_data[2];
1136 for (n = 0; n < s->buf_size; n++) {
1137 float l_re = srcl[2 * n], r_re = srcr[2 * n];
1138 float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
1139 float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
1140 float c_mag = hypotf(c_re, c_im);
1141 float c_phase = atan2f(c_im, c_re);
1142 float l_mag = hypotf(l_re, l_im);
1143 float r_mag = hypotf(r_re, r_im);
1144 float l_phase = atan2f(l_im, l_re);
1145 float r_phase = atan2f(r_im, r_re);
1146 float phase_dif = fabsf(l_phase - r_phase);
1147 float mag_sum = l_mag + r_mag;
1148 float mag_dif = mag_sum < 0.000001 ? 0.f : (l_mag - r_mag) / mag_sum;
1149 float mag_total = hypotf(l_mag, r_mag);
1152 if (phase_dif > M_PI)
1153 phase_dif = 2 * M_PI - phase_dif;
1155 stereo_position(mag_dif, phase_dif, &x, &y);
1156 stereo_transform(&x, &y, s->angle);
1158 s->upmix_3_0(ctx, l_phase, r_phase, c_phase, c_mag, mag_total, x, y, n);
1162 static void filter_2_1(AVFilterContext *ctx)
1164 AudioSurroundContext *s = ctx->priv;
1165 float *srcl, *srcr, *srclfe;
1168 srcl = (float *)s->input->extended_data[0];
1169 srcr = (float *)s->input->extended_data[1];
1170 srclfe = (float *)s->input->extended_data[2];
1172 for (n = 0; n < s->buf_size; n++) {
1173 float l_re = srcl[2 * n], r_re = srcr[2 * n];
1174 float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
1175 float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
1176 float c_phase = atan2f(l_im + r_im, l_re + r_re);
1177 float l_mag = hypotf(l_re, l_im);
1178 float r_mag = hypotf(r_re, r_im);
1179 float l_phase = atan2f(l_im, l_re);
1180 float r_phase = atan2f(r_im, r_re);
1181 float phase_dif = fabsf(l_phase - r_phase);
1182 float mag_sum = l_mag + r_mag;
1183 float mag_dif = mag_sum < 0.000001 ? 0.f : (l_mag - r_mag) / mag_sum;
1184 float mag_total = hypotf(l_mag, r_mag);
1187 if (phase_dif > M_PI)
1188 phase_dif = 2 * M_PI - phase_dif;
1190 stereo_position(mag_dif, phase_dif, &x, &y);
1191 stereo_transform(&x, &y, s->angle);
1193 s->upmix_2_1(ctx, l_phase, r_phase, c_phase, mag_total, lfe_re, lfe_im, x, y, n);
1197 static void filter_5_0_side(AVFilterContext *ctx)
1199 AudioSurroundContext *s = ctx->priv;
1200 float *srcl, *srcr, *srcc, *srcsl, *srcsr;
1203 srcl = (float *)s->input->extended_data[0];
1204 srcr = (float *)s->input->extended_data[1];
1205 srcc = (float *)s->input->extended_data[2];
1206 srcsl = (float *)s->input->extended_data[3];
1207 srcsr = (float *)s->input->extended_data[4];
1209 for (n = 0; n < s->buf_size; n++) {
1210 float fl_re = srcl[2 * n], fr_re = srcr[2 * n];
1211 float fl_im = srcl[2 * n + 1], fr_im = srcr[2 * n + 1];
1212 float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
1213 float sl_re = srcsl[2 * n], sl_im = srcsl[2 * n + 1];
1214 float sr_re = srcsr[2 * n], sr_im = srcsr[2 * n + 1];
1215 float fl_mag = hypotf(fl_re, fl_im);
1216 float fr_mag = hypotf(fr_re, fr_im);
1217 float fl_phase = atan2f(fl_im, fl_re);
1218 float fr_phase = atan2f(fr_im, fr_re);
1219 float sl_mag = hypotf(sl_re, sl_im);
1220 float sr_mag = hypotf(sr_re, sr_im);
1221 float sl_phase = atan2f(sl_im, sl_re);
1222 float sr_phase = atan2f(sr_im, sr_re);
1223 float phase_difl = fabsf(fl_phase - sl_phase);
1224 float phase_difr = fabsf(fr_phase - sr_phase);
1225 float magl_sum = fl_mag + sl_mag;
1226 float magr_sum = fr_mag + sr_mag;
1227 float mag_difl = magl_sum < 0.000001 ? 0.f : (fl_mag - sl_mag) / magl_sum;
1228 float mag_difr = magr_sum < 0.000001 ? 0.f : (fr_mag - sr_mag) / magr_sum;
1229 float mag_totall = hypotf(fl_mag, sl_mag);
1230 float mag_totalr = hypotf(fr_mag, sr_mag);
1231 float bl_phase = atan2f(fl_im + sl_im, fl_re + sl_re);
1232 float br_phase = atan2f(fr_im + sr_im, fr_re + sr_re);
1236 if (phase_difl > M_PI)
1237 phase_difl = 2 * M_PI - phase_difl;
1239 if (phase_difr > M_PI)
1240 phase_difr = 2 * M_PI - phase_difr;
1242 stereo_position(mag_difl, phase_difl, &xl, &yl);
1243 stereo_position(mag_difr, phase_difr, &xr, &yr);
1245 s->upmix_5_0(ctx, c_re, c_im,
1246 mag_totall, mag_totalr,
1254 static void filter_5_1_side(AVFilterContext *ctx)
1256 AudioSurroundContext *s = ctx->priv;
1257 float *srcl, *srcr, *srcc, *srclfe, *srcsl, *srcsr;
1260 srcl = (float *)s->input->extended_data[0];
1261 srcr = (float *)s->input->extended_data[1];
1262 srcc = (float *)s->input->extended_data[2];
1263 srclfe = (float *)s->input->extended_data[3];
1264 srcsl = (float *)s->input->extended_data[4];
1265 srcsr = (float *)s->input->extended_data[5];
1267 for (n = 0; n < s->buf_size; n++) {
1268 float fl_re = srcl[2 * n], fr_re = srcr[2 * n];
1269 float fl_im = srcl[2 * n + 1], fr_im = srcr[2 * n + 1];
1270 float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
1271 float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
1272 float sl_re = srcsl[2 * n], sl_im = srcsl[2 * n + 1];
1273 float sr_re = srcsr[2 * n], sr_im = srcsr[2 * n + 1];
1274 float fl_mag = hypotf(fl_re, fl_im);
1275 float fr_mag = hypotf(fr_re, fr_im);
1276 float fl_phase = atan2f(fl_im, fl_re);
1277 float fr_phase = atan2f(fr_im, fr_re);
1278 float sl_mag = hypotf(sl_re, sl_im);
1279 float sr_mag = hypotf(sr_re, sr_im);
1280 float sl_phase = atan2f(sl_im, sl_re);
1281 float sr_phase = atan2f(sr_im, sr_re);
1282 float phase_difl = fabsf(fl_phase - sl_phase);
1283 float phase_difr = fabsf(fr_phase - sr_phase);
1284 float magl_sum = fl_mag + sl_mag;
1285 float magr_sum = fr_mag + sr_mag;
1286 float mag_difl = magl_sum < 0.000001 ? 0.f : (fl_mag - sl_mag) / magl_sum;
1287 float mag_difr = magr_sum < 0.000001 ? 0.f : (fr_mag - sr_mag) / magr_sum;
1288 float mag_totall = hypotf(fl_mag, sl_mag);
1289 float mag_totalr = hypotf(fr_mag, sr_mag);
1290 float bl_phase = atan2f(fl_im + sl_im, fl_re + sl_re);
1291 float br_phase = atan2f(fr_im + sr_im, fr_re + sr_re);
1295 if (phase_difl > M_PI)
1296 phase_difl = 2 * M_PI - phase_difl;
1298 if (phase_difr > M_PI)
1299 phase_difr = 2 * M_PI - phase_difr;
1301 stereo_position(mag_difl, phase_difl, &xl, &yl);
1302 stereo_position(mag_difr, phase_difr, &xr, &yr);
1304 s->upmix_5_1(ctx, c_re, c_im, lfe_re, lfe_im,
1305 mag_totall, mag_totalr,
1313 static void filter_5_1_back(AVFilterContext *ctx)
1315 AudioSurroundContext *s = ctx->priv;
1316 float *srcl, *srcr, *srcc, *srclfe, *srcbl, *srcbr;
1319 srcl = (float *)s->input->extended_data[0];
1320 srcr = (float *)s->input->extended_data[1];
1321 srcc = (float *)s->input->extended_data[2];
1322 srclfe = (float *)s->input->extended_data[3];
1323 srcbl = (float *)s->input->extended_data[4];
1324 srcbr = (float *)s->input->extended_data[5];
1326 for (n = 0; n < s->buf_size; n++) {
1327 float fl_re = srcl[2 * n], fr_re = srcr[2 * n];
1328 float fl_im = srcl[2 * n + 1], fr_im = srcr[2 * n + 1];
1329 float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
1330 float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
1331 float bl_re = srcbl[2 * n], bl_im = srcbl[2 * n + 1];
1332 float br_re = srcbr[2 * n], br_im = srcbr[2 * n + 1];
1333 float fl_mag = hypotf(fl_re, fl_im);
1334 float fr_mag = hypotf(fr_re, fr_im);
1335 float fl_phase = atan2f(fl_im, fl_re);
1336 float fr_phase = atan2f(fr_im, fr_re);
1337 float bl_mag = hypotf(bl_re, bl_im);
1338 float br_mag = hypotf(br_re, br_im);
1339 float bl_phase = atan2f(bl_im, bl_re);
1340 float br_phase = atan2f(br_im, br_re);
1341 float phase_difl = fabsf(fl_phase - bl_phase);
1342 float phase_difr = fabsf(fr_phase - br_phase);
1343 float magl_sum = fl_mag + bl_mag;
1344 float magr_sum = fr_mag + br_mag;
1345 float mag_difl = magl_sum < 0.000001 ? 0.f : (fl_mag - bl_mag) / magl_sum;
1346 float mag_difr = magr_sum < 0.000001 ? 0.f : (fr_mag - br_mag) / magr_sum;
1347 float mag_totall = hypotf(fl_mag, bl_mag);
1348 float mag_totalr = hypotf(fr_mag, br_mag);
1349 float sl_phase = atan2f(fl_im + bl_im, fl_re + bl_re);
1350 float sr_phase = atan2f(fr_im + br_im, fr_re + br_re);
1354 if (phase_difl > M_PI)
1355 phase_difl = 2 * M_PI - phase_difl;
1357 if (phase_difr > M_PI)
1358 phase_difr = 2 * M_PI - phase_difr;
1360 stereo_position(mag_difl, phase_difl, &xl, &yl);
1361 stereo_position(mag_difr, phase_difr, &xr, &yr);
1363 s->upmix_5_1(ctx, c_re, c_im, lfe_re, lfe_im,
1364 mag_totall, mag_totalr,
1372 static int init(AVFilterContext *ctx)
1374 AudioSurroundContext *s = ctx->priv;
1378 if (!(s->out_channel_layout = av_get_channel_layout(s->out_channel_layout_str))) {
1379 av_log(ctx, AV_LOG_ERROR, "Error parsing output channel layout '%s'.\n",
1380 s->out_channel_layout_str);
1381 return AVERROR(EINVAL);
1384 if (!(s->in_channel_layout = av_get_channel_layout(s->in_channel_layout_str))) {
1385 av_log(ctx, AV_LOG_ERROR, "Error parsing input channel layout '%s'.\n",
1386 s->in_channel_layout_str);
1387 return AVERROR(EINVAL);
1390 if (s->lowcutf >= s->highcutf) {
1391 av_log(ctx, AV_LOG_ERROR, "Low cut-off '%d' should be less than high cut-off '%d'.\n",
1392 s->lowcutf, s->highcutf);
1393 return AVERROR(EINVAL);
1396 switch (s->in_channel_layout) {
1397 case AV_CH_LAYOUT_STEREO:
1398 s->filter = filter_stereo;
1399 switch (s->out_channel_layout) {
1400 case AV_CH_LAYOUT_MONO:
1401 s->upmix_stereo = upmix_1_0;
1403 case AV_CH_LAYOUT_STEREO:
1404 s->upmix_stereo = upmix_stereo;
1406 case AV_CH_LAYOUT_2POINT1:
1407 s->upmix_stereo = upmix_2_1;
1409 case AV_CH_LAYOUT_SURROUND:
1410 s->upmix_stereo = upmix_3_0;
1412 case AV_CH_LAYOUT_3POINT1:
1413 s->upmix_stereo = upmix_3_1;
1415 case AV_CH_LAYOUT_4POINT0:
1416 s->upmix_stereo = upmix_4_0;
1418 case AV_CH_LAYOUT_4POINT1:
1419 s->upmix_stereo = upmix_4_1;
1421 case AV_CH_LAYOUT_5POINT0_BACK:
1422 s->upmix_stereo = upmix_5_0_back;
1424 case AV_CH_LAYOUT_5POINT1_BACK:
1425 s->upmix_stereo = upmix_5_1_back;
1427 case AV_CH_LAYOUT_6POINT0:
1428 s->upmix_stereo = upmix_6_0;
1430 case AV_CH_LAYOUT_6POINT1:
1431 s->upmix_stereo = upmix_6_1;
1433 case AV_CH_LAYOUT_7POINT0:
1434 s->upmix_stereo = upmix_7_0;
1436 case AV_CH_LAYOUT_7POINT1:
1437 s->upmix_stereo = upmix_7_1;
1443 case AV_CH_LAYOUT_2POINT1:
1444 s->filter = filter_2_1;
1445 switch (s->out_channel_layout) {
1446 case AV_CH_LAYOUT_5POINT1_BACK:
1447 s->upmix_2_1 = upmix_5_1_back_2_1;
1453 case AV_CH_LAYOUT_SURROUND:
1454 s->filter = filter_surround;
1455 switch (s->out_channel_layout) {
1456 case AV_CH_LAYOUT_3POINT1:
1457 s->upmix_3_0 = upmix_3_1_surround;
1459 case AV_CH_LAYOUT_5POINT1_BACK:
1460 s->upmix_3_0 = upmix_5_1_back_surround;
1466 case AV_CH_LAYOUT_5POINT0:
1467 s->filter = filter_5_0_side;
1468 switch (s->out_channel_layout) {
1469 case AV_CH_LAYOUT_7POINT1:
1470 s->upmix_5_0 = upmix_7_1_5_0_side;
1476 case AV_CH_LAYOUT_5POINT1:
1477 s->filter = filter_5_1_side;
1478 switch (s->out_channel_layout) {
1479 case AV_CH_LAYOUT_7POINT1:
1480 s->upmix_5_1 = upmix_7_1_5_1;
1486 case AV_CH_LAYOUT_5POINT1_BACK:
1487 s->filter = filter_5_1_back;
1488 switch (s->out_channel_layout) {
1489 case AV_CH_LAYOUT_7POINT1:
1490 s->upmix_5_1 = upmix_7_1_5_1;
1498 av_log(ctx, AV_LOG_ERROR, "Unsupported upmix: '%s' -> '%s'.\n",
1499 s->in_channel_layout_str, s->out_channel_layout_str);
1500 return AVERROR(EINVAL);
1503 s->buf_size = 1 << av_log2(s->win_size);
1504 s->pts = AV_NOPTS_VALUE;
1506 s->window_func_lut = av_calloc(s->buf_size, sizeof(*s->window_func_lut));
1507 if (!s->window_func_lut)
1508 return AVERROR(ENOMEM);
1510 generate_window_func(s->window_func_lut, s->buf_size, s->win_func, &overlap);
1511 if (s->overlap == 1)
1512 s->overlap = overlap;
1514 for (i = 0; i < s->buf_size; i++)
1515 s->window_func_lut[i] = sqrtf(s->window_func_lut[i] / s->buf_size);
1516 s->hop_size = s->buf_size * (1. - s->overlap);
1517 if (s->hop_size <= 0)
1518 return AVERROR(EINVAL);
1520 if (s->all_x >= 0.f)
1521 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;
1522 if (s->all_y >= 0.f)
1523 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;
1528 static int fft_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
1530 AudioSurroundContext *s = ctx->priv;
1531 const float level_in = s->input_levels[ch];
1535 memset(s->input->extended_data[ch] + s->buf_size * sizeof(float), 0, s->buf_size * sizeof(float));
1537 dst = (float *)s->input->extended_data[ch];
1538 for (n = 0; n < s->buf_size; n++) {
1539 dst[n] *= s->window_func_lut[n] * level_in;
1542 av_rdft_calc(s->rdft[ch], (float *)s->input->extended_data[ch]);
1547 static int ifft_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
1549 AudioSurroundContext *s = ctx->priv;
1550 const float level_out = s->output_levels[ch];
1555 av_rdft_calc(s->irdft[ch], (float *)s->output->extended_data[ch]);
1557 dst = (float *)s->output->extended_data[ch];
1558 ptr = (float *)s->overlap_buffer->extended_data[ch];
1560 memmove(s->overlap_buffer->extended_data[ch],
1561 s->overlap_buffer->extended_data[ch] + s->hop_size * sizeof(float),
1562 s->buf_size * sizeof(float));
1563 memset(s->overlap_buffer->extended_data[ch] + s->buf_size * sizeof(float),
1564 0, s->hop_size * sizeof(float));
1566 for (n = 0; n < s->buf_size; n++) {
1567 ptr[n] += dst[n] * s->window_func_lut[n] * level_out;
1570 ptr = (float *)s->overlap_buffer->extended_data[ch];
1571 dst = (float *)out->extended_data[ch];
1572 memcpy(dst, ptr, s->hop_size * sizeof(float));
1577 static int filter_frame(AVFilterLink *inlink)
1579 AVFilterContext *ctx = inlink->dst;
1580 AVFilterLink *outlink = ctx->outputs[0];
1581 AudioSurroundContext *s = ctx->priv;
1585 ret = av_audio_fifo_peek(s->fifo, (void **)s->input->extended_data, s->buf_size);
1589 ctx->internal->execute(ctx, fft_channel, NULL, NULL, inlink->channels);
1593 out = ff_get_audio_buffer(outlink, s->hop_size);
1595 return AVERROR(ENOMEM);
1597 ctx->internal->execute(ctx, ifft_channel, out, NULL, outlink->channels);
1600 if (s->pts != AV_NOPTS_VALUE)
1601 s->pts += av_rescale_q(out->nb_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
1602 av_audio_fifo_drain(s->fifo, FFMIN(av_audio_fifo_size(s->fifo), s->hop_size));
1604 return ff_filter_frame(outlink, out);
1607 static int activate(AVFilterContext *ctx)
1609 AVFilterLink *inlink = ctx->inputs[0];
1610 AVFilterLink *outlink = ctx->outputs[0];
1611 AudioSurroundContext *s = ctx->priv;
1613 int ret = 0, status;
1616 FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
1618 if (!s->eof && av_audio_fifo_size(s->fifo) < s->buf_size) {
1619 ret = ff_inlink_consume_frame(inlink, &in);
1624 ret = av_audio_fifo_write(s->fifo, (void **)in->extended_data,
1626 if (ret >= 0 && s->pts == AV_NOPTS_VALUE)
1635 if ((av_audio_fifo_size(s->fifo) >= s->buf_size) ||
1636 (av_audio_fifo_size(s->fifo) > 0 && s->eof)) {
1637 ret = filter_frame(inlink);
1638 if (av_audio_fifo_size(s->fifo) >= s->buf_size)
1639 ff_filter_set_ready(ctx, 100);
1643 if (!s->eof && ff_inlink_acknowledge_status(inlink, &status, &pts)) {
1644 if (status == AVERROR_EOF) {
1646 if (av_audio_fifo_size(s->fifo) >= 0) {
1647 ff_filter_set_ready(ctx, 100);
1653 if (s->eof && av_audio_fifo_size(s->fifo) <= 0) {
1654 ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
1659 FF_FILTER_FORWARD_WANTED(outlink, inlink);
1661 return FFERROR_NOT_READY;
1664 static av_cold void uninit(AVFilterContext *ctx)
1666 AudioSurroundContext *s = ctx->priv;
1669 av_frame_free(&s->input);
1670 av_frame_free(&s->output);
1671 av_frame_free(&s->overlap_buffer);
1673 for (ch = 0; ch < s->nb_in_channels; ch++) {
1674 av_rdft_end(s->rdft[ch]);
1676 for (ch = 0; ch < s->nb_out_channels; ch++) {
1677 av_rdft_end(s->irdft[ch]);
1679 av_freep(&s->input_levels);
1680 av_freep(&s->output_levels);
1682 av_freep(&s->irdft);
1683 av_audio_fifo_free(s->fifo);
1684 av_freep(&s->window_func_lut);
1687 #define OFFSET(x) offsetof(AudioSurroundContext, x)
1688 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
1690 static const AVOption surround_options[] = {
1691 { "chl_out", "set output channel layout", OFFSET(out_channel_layout_str), AV_OPT_TYPE_STRING, {.str="5.1"}, 0, 0, FLAGS },
1692 { "chl_in", "set input channel layout", OFFSET(in_channel_layout_str), AV_OPT_TYPE_STRING, {.str="stereo"},0, 0, FLAGS },
1693 { "level_in", "set input level", OFFSET(level_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1694 { "level_out", "set output level", OFFSET(level_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1695 { "lfe", "output LFE", OFFSET(output_lfe), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
1696 { "lfe_low", "LFE low cut off", OFFSET(lowcutf), AV_OPT_TYPE_INT, {.i64=128}, 0, 256, FLAGS },
1697 { "lfe_high", "LFE high cut off", OFFSET(highcutf), AV_OPT_TYPE_INT, {.i64=256}, 0, 512, FLAGS },
1698 { "lfe_mode", "set LFE channel mode", OFFSET(lfe_mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "lfe_mode" },
1699 { "add", "just add LFE channel", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 1, FLAGS, "lfe_mode" },
1700 { "sub", "substract LFE channel with others", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 1, FLAGS, "lfe_mode" },
1701 { "angle", "set soundfield transform angle", OFFSET(angle), AV_OPT_TYPE_FLOAT, {.dbl=90}, 0, 360, FLAGS },
1702 { "fc_in", "set front center channel input level", OFFSET(fc_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1703 { "fc_out", "set front center channel output level", OFFSET(fc_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1704 { "fl_in", "set front left channel input level", OFFSET(fl_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1705 { "fl_out", "set front left channel output level", OFFSET(fl_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1706 { "fr_in", "set front right channel input level", OFFSET(fr_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1707 { "fr_out", "set front right channel output level", OFFSET(fr_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1708 { "sl_in", "set side left channel input level", OFFSET(sl_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1709 { "sl_out", "set side left channel output level", OFFSET(sl_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1710 { "sr_in", "set side right channel input level", OFFSET(sr_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1711 { "sr_out", "set side right channel output level", OFFSET(sr_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1712 { "bl_in", "set back left channel input level", OFFSET(bl_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1713 { "bl_out", "set back left channel output level", OFFSET(bl_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1714 { "br_in", "set back right channel input level", OFFSET(br_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1715 { "br_out", "set back right channel output level", OFFSET(br_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1716 { "bc_in", "set back center channel input level", OFFSET(bc_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1717 { "bc_out", "set back center channel output level", OFFSET(bc_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1718 { "lfe_in", "set lfe channel input level", OFFSET(lfe_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1719 { "lfe_out", "set lfe channel output level", OFFSET(lfe_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
1720 { "allx", "set all channel's x spread", OFFSET(all_x), AV_OPT_TYPE_FLOAT, {.dbl=-1}, -1, 15, FLAGS },
1721 { "ally", "set all channel's y spread", OFFSET(all_y), AV_OPT_TYPE_FLOAT, {.dbl=-1}, -1, 15, FLAGS },
1722 { "fcx", "set front center channel x spread", OFFSET(fc_x), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1723 { "flx", "set front left channel x spread", OFFSET(fl_x), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1724 { "frx", "set front right channel x spread", OFFSET(fr_x), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1725 { "blx", "set back left channel x spread", OFFSET(bl_x), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1726 { "brx", "set back right channel x spread", OFFSET(br_x), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1727 { "slx", "set side left channel x spread", OFFSET(sl_x), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1728 { "srx", "set side right channel x spread", OFFSET(sr_x), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1729 { "bcx", "set back center channel x spread", OFFSET(bc_x), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1730 { "fcy", "set front center channel y spread", OFFSET(fc_y), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1731 { "fly", "set front left channel y spread", OFFSET(fl_y), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1732 { "fry", "set front right channel y spread", OFFSET(fr_y), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1733 { "bly", "set back left channel y spread", OFFSET(bl_y), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1734 { "bry", "set back right channel y spread", OFFSET(br_y), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1735 { "sly", "set side left channel y spread", OFFSET(sl_y), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1736 { "sry", "set side right channel y spread", OFFSET(sr_y), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1737 { "bcy", "set back center channel y spread", OFFSET(bc_y), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 15, FLAGS },
1738 { "win_size", "set window size", OFFSET(win_size), AV_OPT_TYPE_INT, {.i64 = 4096}, 1024, 65536, FLAGS },
1739 { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" },
1740 { "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, FLAGS, "win_func" },
1741 { "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" },
1742 { "hann", "Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" },
1743 { "hanning", "Hanning", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" },
1744 { "hamming", "Hamming", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING}, 0, 0, FLAGS, "win_func" },
1745 { "blackman", "Blackman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },
1746 { "welch", "Welch", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH}, 0, 0, FLAGS, "win_func" },
1747 { "flattop", "Flat-top", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP}, 0, 0, FLAGS, "win_func" },
1748 { "bharris", "Blackman-Harris", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS}, 0, 0, FLAGS, "win_func" },
1749 { "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" },
1750 { "bhann", "Bartlett-Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN}, 0, 0, FLAGS, "win_func" },
1751 { "sine", "Sine", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE}, 0, 0, FLAGS, "win_func" },
1752 { "nuttall", "Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL}, 0, 0, FLAGS, "win_func" },
1753 { "lanczos", "Lanczos", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS}, 0, 0, FLAGS, "win_func" },
1754 { "gauss", "Gauss", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS}, 0, 0, FLAGS, "win_func" },
1755 { "tukey", "Tukey", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY}, 0, 0, FLAGS, "win_func" },
1756 { "dolph", "Dolph-Chebyshev", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH}, 0, 0, FLAGS, "win_func" },
1757 { "cauchy", "Cauchy", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY}, 0, 0, FLAGS, "win_func" },
1758 { "parzen", "Parzen", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN}, 0, 0, FLAGS, "win_func" },
1759 { "poisson", "Poisson", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON}, 0, 0, FLAGS, "win_func" },
1760 { "bohman", "Bohman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BOHMAN}, 0, 0, FLAGS, "win_func" },
1761 { "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0, 1, FLAGS },
1765 AVFILTER_DEFINE_CLASS(surround);
1767 static const AVFilterPad inputs[] = {
1770 .type = AVMEDIA_TYPE_AUDIO,
1771 .config_props = config_input,
1776 static const AVFilterPad outputs[] = {
1779 .type = AVMEDIA_TYPE_AUDIO,
1780 .config_props = config_output,
1785 AVFilter ff_af_surround = {
1787 .description = NULL_IF_CONFIG_SMALL("Apply audio surround upmix filter."),
1788 .query_formats = query_formats,
1789 .priv_size = sizeof(AudioSurroundContext),
1790 .priv_class = &surround_class,
1793 .activate = activate,
1796 .flags = AVFILTER_FLAG_SLICE_THREADS,