FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* Copyright (c) 2017 Paul B Mahol
3			*
4			* This file is part of FFmpeg.
5			*
6			* FFmpeg is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU Lesser General Public
8			* License as published by the Free Software Foundation; either
9			* version 2.1 of the License, or (at your option) any later version.
10			*
11			* FFmpeg is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14			* Lesser General Public License for more details.
15			*
16			* You should have received a copy of the GNU Lesser General Public
17			* License along with FFmpeg; if not, write to the Free Software
18			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19			*/
20
21			#include "libavutil/avassert.h"
22			#include "libavutil/channel_layout.h"
23			#include "libavutil/mem.h"
24			#include "libavutil/opt.h"
25			#include "libavutil/tx.h"
26			#include "avfilter.h"
27			#include "audio.h"
28			#include "filters.h"
29			#include "internal.h"
30			#include "formats.h"
31			#include "window_func.h"
32
33			enum SurroundChannel {
34			SC_FL, SC_FR, SC_FC, SC_LF, SC_BL, SC_BR, SC_BC, SC_SL, SC_SR,
35			SC_NB,
36			};
37
38			static const int ch_map[SC_NB] = {
39			[SC_FL] = AV_CHAN_FRONT_LEFT,
40			[SC_FR] = AV_CHAN_FRONT_RIGHT,
41			[SC_FC] = AV_CHAN_FRONT_CENTER,
42			[SC_LF] = AV_CHAN_LOW_FREQUENCY,
43			[SC_BL] = AV_CHAN_BACK_LEFT,
44			[SC_BR] = AV_CHAN_BACK_RIGHT,
45			[SC_BC] = AV_CHAN_BACK_CENTER,
46			[SC_SL] = AV_CHAN_SIDE_LEFT,
47			[SC_SR] = AV_CHAN_SIDE_RIGHT,
48			};
49
50			static const int sc_map[16] = {
51			[AV_CHAN_FRONT_LEFT ] = SC_FL,
52			[AV_CHAN_FRONT_RIGHT ] = SC_FR,
53			[AV_CHAN_FRONT_CENTER ] = SC_FC,
54			[AV_CHAN_LOW_FREQUENCY] = SC_LF,
55			[AV_CHAN_BACK_LEFT ] = SC_BL,
56			[AV_CHAN_BACK_RIGHT ] = SC_BR,
57			[AV_CHAN_BACK_CENTER ] = SC_BC,
58			[AV_CHAN_SIDE_LEFT ] = SC_SL,
59			[AV_CHAN_SIDE_RIGHT ] = SC_SR,
60			};
61
62			typedef struct AudioSurroundContext {
63			const AVClass *class;
64
65			AVChannelLayout out_ch_layout;
66			AVChannelLayout in_ch_layout;
67
68			float level_in;
69			float level_out;
70			float f_i[SC_NB];
71			float f_o[SC_NB];
72			int lfe_mode;
73			float smooth;
74			float angle;
75			float focus;
76			int win_size;
77			int win_func;
78			float win_gain;
79			float overlap;
80
81			float all_x;
82			float all_y;
83
84			float f_x[SC_NB];
85			float f_y[SC_NB];
86
87			float *input_levels;
88			float *output_levels;
89			int output_lfe;
90			int create_lfe;
91			int lowcutf;
92			int highcutf;
93
94			float lowcut;
95			float highcut;
96
97			int nb_in_channels;
98			int nb_out_channels;
99
100			AVFrame *factors;
101			AVFrame *sfactors;
102			AVFrame *input_in;
103			AVFrame *input;
104			AVFrame *output;
105			AVFrame *output_mag;
106			AVFrame *output_ph;
107			AVFrame *output_out;
108			AVFrame *overlap_buffer;
109			AVFrame *window;
110
111			float *x_pos;
112			float *y_pos;
113			float *l_phase;
114			float *r_phase;
115			float *c_phase;
116			float *c_mag;
117			float *lfe_mag;
118			float *lfe_phase;
119			float *mag_total;
120
121			int rdft_size;
122			int hop_size;
123			AVTXContext **rdft, **irdft;
124			av_tx_fn tx_fn, itx_fn;
125			float *window_func_lut;
126
127			void (*filter)(AVFilterContext *ctx);
128			void (*upmix)(AVFilterContext *ctx, int ch);
129			void (*upmix_5_0)(AVFilterContext *ctx,
130			float c_re, float c_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,
135			float xl, float yl,
136			float xr, float yr,
137			int n);
138			void (*upmix_5_1)(AVFilterContext *ctx,
139			float c_re, float c_im,
140			float lfe_re, float lfe_im,
141			float mag_totall, float mag_totalr,
142			float fl_phase, float fr_phase,
143			float bl_phase, float br_phase,
144			float sl_phase, float sr_phase,
145			float xl, float yl,
146			float xr, float yr,
147			int n);
148			} AudioSurroundContext;
149
150		✗	static int query_formats(AVFilterContext *ctx)
151			{
152		✗	AudioSurroundContext *s = ctx->priv;
153		✗	AVFilterFormats *formats = NULL;
154		✗	AVFilterChannelLayouts *layouts = NULL;
155			int ret;
156
157		✗	ret = ff_add_format(&formats, AV_SAMPLE_FMT_FLTP);
158		✗	if (ret)
159		✗	return ret;
160		✗	ret = ff_set_common_formats(ctx, formats);
161		✗	if (ret)
162		✗	return ret;
163
164		✗	layouts = NULL;
165		✗	ret = ff_add_channel_layout(&layouts, &s->out_ch_layout);
166		✗	if (ret)
167		✗	return ret;
168
169		✗	ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->incfg.channel_layouts);
170		✗	if (ret)
171		✗	return ret;
172
173		✗	layouts = NULL;
174		✗	ret = ff_add_channel_layout(&layouts, &s->in_ch_layout);
175		✗	if (ret)
176		✗	return ret;
177
178		✗	ret = ff_channel_layouts_ref(layouts, &ctx->inputs[0]->outcfg.channel_layouts);
179		✗	if (ret)
180		✗	return ret;
181
182		✗	return ff_set_common_all_samplerates(ctx);
183			}
184
185		✗	static void set_input_levels(AVFilterContext *ctx)
186			{
187		✗	AudioSurroundContext *s = ctx->priv;
188
189		✗	for (int ch = 0; ch < s->nb_in_channels && s->level_in >= 0.f; ch++)
190		✗	s->input_levels[ch] = s->level_in;
191		✗	s->level_in = -1.f;
192
193		✗	for (int n = 0; n < SC_NB; n++) {
194		✗	const int ch = av_channel_layout_index_from_channel(&s->in_ch_layout, ch_map[n]);
195		✗	if (ch >= 0)
196		✗	s->input_levels[ch] = s->f_i[n];
197			}
198		✗	}
199
200		✗	static void set_output_levels(AVFilterContext *ctx)
201			{
202		✗	AudioSurroundContext *s = ctx->priv;
203
204		✗	for (int ch = 0; ch < s->nb_out_channels && s->level_out >= 0.f; ch++)
205		✗	s->output_levels[ch] = s->level_out;
206		✗	s->level_out = -1.f;
207
208		✗	for (int n = 0; n < SC_NB; n++) {
209		✗	const int ch = av_channel_layout_index_from_channel(&s->out_ch_layout, ch_map[n]);
210		✗	if (ch >= 0)
211		✗	s->output_levels[ch] = s->f_o[n];
212			}
213		✗	}
214
215		✗	static int config_input(AVFilterLink *inlink)
216			{
217		✗	AVFilterContext *ctx = inlink->dst;
218		✗	AudioSurroundContext *s = ctx->priv;
219			int ret;
220
221		✗	s->rdft = av_calloc(inlink->ch_layout.nb_channels, sizeof(*s->rdft));
222		✗	if (!s->rdft)
223		✗	return AVERROR(ENOMEM);
224		✗	s->nb_in_channels = inlink->ch_layout.nb_channels;
225
226		✗	for (int ch = 0; ch < inlink->ch_layout.nb_channels; ch++) {
227		✗	float scale = 1.f;
228
229		✗	ret = av_tx_init(&s->rdft[ch], &s->tx_fn, AV_TX_FLOAT_RDFT,
230			0, s->win_size, &scale, 0);
231		✗	if (ret < 0)
232		✗	return ret;
233			}
234
235		✗	s->input_levels = av_malloc_array(s->nb_in_channels, sizeof(*s->input_levels));
236		✗	if (!s->input_levels)
237		✗	return AVERROR(ENOMEM);
238
239		✗	set_input_levels(ctx);
240
241		✗	s->window = ff_get_audio_buffer(inlink, s->win_size * 2);
242		✗	if (!s->window)
243		✗	return AVERROR(ENOMEM);
244
245		✗	s->input_in = ff_get_audio_buffer(inlink, s->win_size * 2);
246		✗	if (!s->input_in)
247		✗	return AVERROR(ENOMEM);
248
249		✗	s->input = ff_get_audio_buffer(inlink, s->win_size + 2);
250		✗	if (!s->input)
251		✗	return AVERROR(ENOMEM);
252
253		✗	s->lowcut = 1.f * s->lowcutf / (inlink->sample_rate * 0.5) * (s->win_size / 2);
254		✗	s->highcut = 1.f * s->highcutf / (inlink->sample_rate * 0.5) * (s->win_size / 2);
255
256		✗	return 0;
257			}
258
259		✗	static int config_output(AVFilterLink *outlink)
260			{
261		✗	AVFilterContext *ctx = outlink->src;
262		✗	AudioSurroundContext *s = ctx->priv;
263			int ret;
264
265		✗	s->irdft = av_calloc(outlink->ch_layout.nb_channels, sizeof(*s->irdft));
266		✗	if (!s->irdft)
267		✗	return AVERROR(ENOMEM);
268		✗	s->nb_out_channels = outlink->ch_layout.nb_channels;
269
270		✗	for (int ch = 0; ch < outlink->ch_layout.nb_channels; ch++) {
271		✗	float iscale = 1.f;
272
273		✗	ret = av_tx_init(&s->irdft[ch], &s->itx_fn, AV_TX_FLOAT_RDFT,
274			1, s->win_size, &iscale, 0);
275		✗	if (ret < 0)
276		✗	return ret;
277			}
278
279		✗	s->output_levels = av_malloc_array(s->nb_out_channels, sizeof(*s->output_levels));
280		✗	if (!s->output_levels)
281		✗	return AVERROR(ENOMEM);
282
283		✗	set_output_levels(ctx);
284
285		✗	s->factors = ff_get_audio_buffer(outlink, s->win_size + 2);
286		✗	s->sfactors = ff_get_audio_buffer(outlink, s->win_size + 2);
287		✗	s->output_ph = ff_get_audio_buffer(outlink, s->win_size + 2);
288		✗	s->output_mag = ff_get_audio_buffer(outlink, s->win_size + 2);
289		✗	s->output_out = ff_get_audio_buffer(outlink, s->win_size + 2);
290		✗	s->output = ff_get_audio_buffer(outlink, s->win_size + 2);
291		✗	s->overlap_buffer = ff_get_audio_buffer(outlink, s->win_size * 2);
292		✗	if (!s->overlap_buffer || !s->output || !s->output_out || !s->output_mag ||
293		✗	!s->output_ph || !s->factors || !s->sfactors)
294		✗	return AVERROR(ENOMEM);
295
296		✗	s->rdft_size = s->win_size / 2 + 1;
297
298		✗	s->x_pos = av_calloc(s->rdft_size, sizeof(*s->x_pos));
299		✗	s->y_pos = av_calloc(s->rdft_size, sizeof(*s->y_pos));
300		✗	s->l_phase = av_calloc(s->rdft_size, sizeof(*s->l_phase));
301		✗	s->r_phase = av_calloc(s->rdft_size, sizeof(*s->r_phase));
302		✗	s->c_mag = av_calloc(s->rdft_size, sizeof(*s->c_mag));
303		✗	s->c_phase = av_calloc(s->rdft_size, sizeof(*s->c_phase));
304		✗	s->mag_total = av_calloc(s->rdft_size, sizeof(*s->mag_total));
305		✗	s->lfe_mag = av_calloc(s->rdft_size, sizeof(*s->lfe_mag));
306		✗	s->lfe_phase = av_calloc(s->rdft_size, sizeof(*s->lfe_phase));
307		✗	if (!s->x_pos || !s->y_pos || !s->l_phase || !s->r_phase || !s->lfe_phase ||
308		✗	!s->c_phase || !s->mag_total || !s->lfe_mag || !s->c_mag)
309		✗	return AVERROR(ENOMEM);
310
311		✗	return 0;
312			}
313
314		✗	static float sqrf(float x)
315			{
316		✗	return x * x;
317			}
318
319		✗	static float r_distance(float a)
320			{
321		✗	return fminf(sqrtf(1.f + sqrf(tanf(a))), sqrtf(1.f + sqrf(1.f / tanf(a))));
322			}
323
324			#define MIN_MAG_SUM 0.00000001f
325
326		✗	static void angle_transform(float *x, float *y, float angle)
327			{
328			float reference, r, a;
329
330		✗	if (angle == 90.f)
331		✗	return;
332
333		✗	reference = angle * M_PIf / 180.f;
334		✗	r = hypotf(*x, *y);
335		✗	a = atan2f(*x, *y);
336
337		✗	r /= r_distance(a);
338
339		✗	if (fabsf(a) <= M_PI_4f)
340		✗	a *= reference / M_PI_2f;
341			else
342		✗	a = M_PIf + (-2.f * M_PIf + reference) * (M_PIf - fabsf(a)) * FFDIFFSIGN(a, 0.f) / (3.f * M_PI_2f);
343
344		✗	r *= r_distance(a);
345
346		✗	*x = av_clipf(sinf(a) * r, -1.f, 1.f);
347		✗	*y = av_clipf(cosf(a) * r, -1.f, 1.f);
348			}
349
350		✗	static void focus_transform(float *x, float *y, float focus)
351			{
352			float a, r, ra;
353
354		✗	if (focus == 0.f)
355		✗	return;
356
357		✗	a = atan2f(*x, *y);
358		✗	ra = r_distance(a);
359		✗	r = av_clipf(hypotf(*x, *y) / ra, 0.f, 1.f);
360		✗	r = focus > 0.f ? 1.f - powf(1.f - r, 1.f + focus * 20.f) : powf(r, 1.f - focus * 20.f);
361		✗	r *= ra;
362		✗	*x = av_clipf(sinf(a) * r, -1.f, 1.f);
363		✗	*y = av_clipf(cosf(a) * r, -1.f, 1.f);
364			}
365
366		✗	static void stereo_position(float a, float p, float *x, float *y)
367			{
368			av_assert2(a >= -1.f && a <= 1.f);
369			av_assert2(p >= 0.f && p <= M_PIf);
370		✗	*x = av_clipf(a+a*fmaxf(0.f, p*p-M_PI_2f), -1.f, 1.f);
371		✗	*y = av_clipf(cosf(a*M_PI_2f+M_PIf)*cosf(M_PI_2f-p/M_PIf)*M_LN10f+1.f, -1.f, 1.f);
372		✗	}
373
374		✗	static inline void get_lfe(int output_lfe, int n, float lowcut, float highcut,
375			float *lfe_mag, float c_mag, float *mag_total, int lfe_mode)
376			{
377		✗	if (output_lfe && n < highcut) {
378		✗	*lfe_mag = n < lowcut ? 1.f : .5f*(1.f+cosf(M_PIf*(lowcut-n)/(lowcut-highcut)));
379		✗	*lfe_mag *= c_mag;
380		✗	if (lfe_mode)
381		✗	*mag_total -= *lfe_mag;
382			} else {
383		✗	*lfe_mag = 0.f;
384			}
385		✗	}
386
387			#define TRANSFORM \
388			dst[2 * n ] = mag * cosf(ph); \
389			dst[2 * n + 1] = mag * sinf(ph);
390
391		✗	static void calculate_factors(AVFilterContext *ctx, int ch, int chan)
392			{
393		✗	AudioSurroundContext *s = ctx->priv;
394		✗	float *factor = (float *)s->factors->extended_data[ch];
395		✗	const float f_x = s->f_x[sc_map[chan >= 0 ? chan : 0]];
396		✗	const float f_y = s->f_y[sc_map[chan >= 0 ? chan : 0]];
397		✗	const int rdft_size = s->rdft_size;
398		✗	const float *x = s->x_pos;
399		✗	const float *y = s->y_pos;
400
401		✗	switch (chan) {
402		✗	case AV_CHAN_FRONT_CENTER:
403		✗	for (int n = 0; n < rdft_size; n++)
404		✗	factor[n] = powf(1.f - fabsf(x[n]), f_x) * powf((y[n] + 1.f) * .5f, f_y);
405		✗	break;
406		✗	case AV_CHAN_FRONT_LEFT:
407		✗	for (int n = 0; n < rdft_size; n++)
408		✗	factor[n] = powf(.5f * ( x[n] + 1.f), f_x) * powf((y[n] + 1.f) * .5f, f_y);
409		✗	break;
410		✗	case AV_CHAN_FRONT_RIGHT:
411		✗	for (int n = 0; n < rdft_size; n++)
412		✗	factor[n] = powf(.5f * (-x[n] + 1.f), f_x) * powf((y[n] + 1.f) * .5f, f_y);
413		✗	break;
414		✗	case AV_CHAN_LOW_FREQUENCY:
415		✗	for (int n = 0; n < rdft_size; n++)
416		✗	factor[n] = powf(1.f - fabsf(x[n]), f_x) * powf((1.f - fabsf(y[n])), f_y);
417		✗	break;
418		✗	case AV_CHAN_BACK_CENTER:
419		✗	for (int n = 0; n < rdft_size; n++)
420		✗	factor[n] = powf(1.f - fabsf(x[n]), f_x) * powf((1.f - y[n]) * .5f, f_y);
421		✗	break;
422		✗	case AV_CHAN_BACK_LEFT:
423		✗	for (int n = 0; n < rdft_size; n++)
424		✗	factor[n] = powf(.5f * ( x[n] + 1.f), f_x) * powf(1.f - ((y[n] + 1.f) * .5f), f_y);
425		✗	break;
426		✗	case AV_CHAN_BACK_RIGHT:
427		✗	for (int n = 0; n < rdft_size; n++)
428		✗	factor[n] = powf(.5f * (-x[n] + 1.f), f_x) * powf(1.f - ((y[n] + 1.f) * .5f), f_y);
429		✗	break;
430		✗	case AV_CHAN_SIDE_LEFT:
431		✗	for (int n = 0; n < rdft_size; n++)
432		✗	factor[n] = powf(.5f * ( x[n] + 1.f), f_x) * powf(1.f - fabsf(y[n]), f_y);
433		✗	break;
434		✗	case AV_CHAN_SIDE_RIGHT:
435		✗	for (int n = 0; n < rdft_size; n++)
436		✗	factor[n] = powf(.5f * (-x[n] + 1.f), f_x) * powf(1.f - fabsf(y[n]), f_y);
437		✗	break;
438		✗	default:
439		✗	for (int n = 0; n < rdft_size; n++)
440		✗	factor[n] = 1.f;
441		✗	break;
442			}
443		✗	}
444
445		✗	static void do_transform(AVFilterContext *ctx, int ch)
446			{
447		✗	AudioSurroundContext *s = ctx->priv;
448		✗	float *sfactor = (float *)s->sfactors->extended_data[ch];
449		✗	float *factor = (float *)s->factors->extended_data[ch];
450		✗	float *omag = (float *)s->output_mag->extended_data[ch];
451		✗	float *oph = (float *)s->output_ph->extended_data[ch];
452		✗	float *dst = (float *)s->output->extended_data[ch];
453		✗	const int rdft_size = s->rdft_size;
454		✗	const float smooth = s->smooth;
455
456		✗	if (smooth > 0.f) {
457		✗	for (int n = 0; n < rdft_size; n++)
458		✗	sfactor[n] = smooth * factor[n] + (1.f - smooth) * sfactor[n];
459
460		✗	factor = sfactor;
461			}
462
463		✗	for (int n = 0; n < rdft_size; n++)
464		✗	omag[n] *= factor[n];
465
466		✗	for (int n = 0; n < rdft_size; n++) {
467		✗	const float mag = omag[n];
468		✗	const float ph = oph[n];
469
470		✗	TRANSFORM
471			}
472		✗	}
473
474		✗	static void stereo_copy(AVFilterContext *ctx, int ch, int chan)
475			{
476		✗	AudioSurroundContext *s = ctx->priv;
477		✗	float *omag = (float *)s->output_mag->extended_data[ch];
478		✗	float *oph = (float *)s->output_ph->extended_data[ch];
479		✗	const float *mag_total = s->mag_total;
480		✗	const int rdft_size = s->rdft_size;
481		✗	const float *c_phase = s->c_phase;
482		✗	const float *l_phase = s->l_phase;
483		✗	const float *r_phase = s->r_phase;
484		✗	const float *lfe_mag = s->lfe_mag;
485		✗	const float *c_mag = s->c_mag;
486
487		✗	switch (chan) {
488		✗	case AV_CHAN_FRONT_CENTER:
489		✗	memcpy(omag, c_mag, rdft_size * sizeof(*omag));
490		✗	break;
491		✗	case AV_CHAN_LOW_FREQUENCY:
492		✗	memcpy(omag, lfe_mag, rdft_size * sizeof(*omag));
493		✗	break;
494		✗	case AV_CHAN_FRONT_LEFT:
495			case AV_CHAN_FRONT_RIGHT:
496			case AV_CHAN_BACK_CENTER:
497			case AV_CHAN_BACK_LEFT:
498			case AV_CHAN_BACK_RIGHT:
499			case AV_CHAN_SIDE_LEFT:
500			case AV_CHAN_SIDE_RIGHT:
501		✗	memcpy(omag, mag_total, rdft_size * sizeof(*omag));
502		✗	break;
503		✗	default:
504		✗	break;
505			}
506
507		✗	switch (chan) {
508		✗	case AV_CHAN_FRONT_CENTER:
509			case AV_CHAN_LOW_FREQUENCY:
510			case AV_CHAN_BACK_CENTER:
511		✗	memcpy(oph, c_phase, rdft_size * sizeof(*oph));
512		✗	break;
513		✗	case AV_CHAN_FRONT_LEFT:
514			case AV_CHAN_BACK_LEFT:
515			case AV_CHAN_SIDE_LEFT:
516		✗	memcpy(oph, l_phase, rdft_size * sizeof(*oph));
517		✗	break;
518		✗	case AV_CHAN_FRONT_RIGHT:
519			case AV_CHAN_BACK_RIGHT:
520			case AV_CHAN_SIDE_RIGHT:
521		✗	memcpy(oph, r_phase, rdft_size * sizeof(*oph));
522		✗	break;
523		✗	default:
524		✗	break;
525			}
526		✗	}
527
528		✗	static void stereo_upmix(AVFilterContext *ctx, int ch)
529			{
530		✗	AudioSurroundContext *s = ctx->priv;
531		✗	const int chan = av_channel_layout_channel_from_index(&s->out_ch_layout, ch);
532
533		✗	calculate_factors(ctx, ch, chan);
534
535		✗	stereo_copy(ctx, ch, chan);
536
537		✗	do_transform(ctx, ch);
538		✗	}
539
540		✗	static void l2_1_upmix(AVFilterContext *ctx, int ch)
541			{
542		✗	AudioSurroundContext *s = ctx->priv;
543		✗	const int chan = av_channel_layout_channel_from_index(&s->out_ch_layout, ch);
544		✗	float *omag = (float *)s->output_mag->extended_data[ch];
545		✗	float *oph = (float *)s->output_ph->extended_data[ch];
546		✗	const float *mag_total = s->mag_total;
547		✗	const float *lfe_phase = s->lfe_phase;
548		✗	const int rdft_size = s->rdft_size;
549		✗	const float *c_phase = s->c_phase;
550		✗	const float *l_phase = s->l_phase;
551		✗	const float *r_phase = s->r_phase;
552		✗	const float *lfe_mag = s->lfe_mag;
553		✗	const float *c_mag = s->c_mag;
554
555		✗	switch (chan) {
556		✗	case AV_CHAN_LOW_FREQUENCY:
557		✗	calculate_factors(ctx, ch, -1);
558		✗	break;
559		✗	default:
560		✗	calculate_factors(ctx, ch, chan);
561		✗	break;
562			}
563
564		✗	switch (chan) {
565		✗	case AV_CHAN_FRONT_CENTER:
566		✗	memcpy(omag, c_mag, rdft_size * sizeof(*omag));
567		✗	break;
568		✗	case AV_CHAN_LOW_FREQUENCY:
569		✗	memcpy(omag, lfe_mag, rdft_size * sizeof(*omag));
570		✗	break;
571		✗	case AV_CHAN_FRONT_LEFT:
572			case AV_CHAN_FRONT_RIGHT:
573			case AV_CHAN_BACK_CENTER:
574			case AV_CHAN_BACK_LEFT:
575			case AV_CHAN_BACK_RIGHT:
576			case AV_CHAN_SIDE_LEFT:
577			case AV_CHAN_SIDE_RIGHT:
578		✗	memcpy(omag, mag_total, rdft_size * sizeof(*omag));
579		✗	break;
580		✗	default:
581		✗	break;
582			}
583
584		✗	switch (chan) {
585		✗	case AV_CHAN_LOW_FREQUENCY:
586		✗	memcpy(oph, lfe_phase, rdft_size * sizeof(*oph));
587		✗	break;
588		✗	case AV_CHAN_FRONT_CENTER:
589			case AV_CHAN_BACK_CENTER:
590		✗	memcpy(oph, c_phase, rdft_size * sizeof(*oph));
591		✗	break;
592		✗	case AV_CHAN_FRONT_LEFT:
593			case AV_CHAN_BACK_LEFT:
594			case AV_CHAN_SIDE_LEFT:
595		✗	memcpy(oph, l_phase, rdft_size * sizeof(*oph));
596		✗	break;
597		✗	case AV_CHAN_FRONT_RIGHT:
598			case AV_CHAN_BACK_RIGHT:
599			case AV_CHAN_SIDE_RIGHT:
600		✗	memcpy(oph, r_phase, rdft_size * sizeof(*oph));
601		✗	break;
602		✗	default:
603		✗	break;
604			}
605
606		✗	do_transform(ctx, ch);
607		✗	}
608
609		✗	static void surround_upmix(AVFilterContext *ctx, int ch)
610			{
611		✗	AudioSurroundContext *s = ctx->priv;
612		✗	const int chan = av_channel_layout_channel_from_index(&s->out_ch_layout, ch);
613
614		✗	switch (chan) {
615		✗	case AV_CHAN_FRONT_CENTER:
616		✗	calculate_factors(ctx, ch, -1);
617		✗	break;
618		✗	default:
619		✗	calculate_factors(ctx, ch, chan);
620		✗	break;
621			}
622
623		✗	stereo_copy(ctx, ch, chan);
624
625		✗	do_transform(ctx, ch);
626		✗	}
627
628		✗	static void upmix_7_1_5_0_side(AVFilterContext *ctx,
629			float c_re, float c_im,
630			float mag_totall, float mag_totalr,
631			float fl_phase, float fr_phase,
632			float bl_phase, float br_phase,
633			float sl_phase, float sr_phase,
634			float xl, float yl,
635			float xr, float yr,
636			int n)
637			{
638			float fl_mag, fr_mag, ls_mag, rs_mag, lb_mag, rb_mag;
639			float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb, *dstlfe;
640		✗	float lfe_mag, c_phase, mag_total = (mag_totall + mag_totalr) * 0.5f;
641		✗	AudioSurroundContext *s = ctx->priv;
642
643		✗	dstl = (float *)s->output->extended_data[0];
644		✗	dstr = (float *)s->output->extended_data[1];
645		✗	dstc = (float *)s->output->extended_data[2];
646		✗	dstlfe = (float *)s->output->extended_data[3];
647		✗	dstlb = (float *)s->output->extended_data[4];
648		✗	dstrb = (float *)s->output->extended_data[5];
649		✗	dstls = (float *)s->output->extended_data[6];
650		✗	dstrs = (float *)s->output->extended_data[7];
651
652		✗	c_phase = atan2f(c_im, c_re);
653
654		✗	get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, hypotf(c_re, c_im), &mag_total, s->lfe_mode);
655
656		✗	fl_mag = powf(.5f * (xl + 1.f), s->f_x[SC_FL]) * powf((yl + 1.f) * .5f, s->f_y[SC_FL]) * mag_totall;
657		✗	fr_mag = powf(.5f * (xr + 1.f), s->f_x[SC_FR]) * powf((yr + 1.f) * .5f, s->f_y[SC_FR]) * mag_totalr;
658		✗	lb_mag = powf(.5f * (-xl + 1.f), s->f_x[SC_BL]) * powf((yl + 1.f) * .5f, s->f_y[SC_BL]) * mag_totall;
659		✗	rb_mag = powf(.5f * (-xr + 1.f), s->f_x[SC_BR]) * powf((yr + 1.f) * .5f, s->f_y[SC_BR]) * mag_totalr;
660		✗	ls_mag = powf(1.f - fabsf(xl), s->f_x[SC_SL]) * powf((yl + 1.f) * .5f, s->f_y[SC_SL]) * mag_totall;
661		✗	rs_mag = powf(1.f - fabsf(xr), s->f_x[SC_SR]) * powf((yr + 1.f) * .5f, s->f_y[SC_SR]) * mag_totalr;
662
663		✗	dstl[2 * n ] = fl_mag * cosf(fl_phase);
664		✗	dstl[2 * n + 1] = fl_mag * sinf(fl_phase);
665
666		✗	dstr[2 * n ] = fr_mag * cosf(fr_phase);
667		✗	dstr[2 * n + 1] = fr_mag * sinf(fr_phase);
668
669		✗	dstc[2 * n ] = c_re;
670		✗	dstc[2 * n + 1] = c_im;
671
672		✗	dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
673		✗	dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
674
675		✗	dstlb[2 * n ] = lb_mag * cosf(bl_phase);
676		✗	dstlb[2 * n + 1] = lb_mag * sinf(bl_phase);
677
678		✗	dstrb[2 * n ] = rb_mag * cosf(br_phase);
679		✗	dstrb[2 * n + 1] = rb_mag * sinf(br_phase);
680
681		✗	dstls[2 * n ] = ls_mag * cosf(sl_phase);
682		✗	dstls[2 * n + 1] = ls_mag * sinf(sl_phase);
683
684		✗	dstrs[2 * n ] = rs_mag * cosf(sr_phase);
685		✗	dstrs[2 * n + 1] = rs_mag * sinf(sr_phase);
686		✗	}
687
688		✗	static void upmix_7_1_5_1(AVFilterContext *ctx,
689			float c_re, float c_im,
690			float lfe_re, float lfe_im,
691			float mag_totall, float mag_totalr,
692			float fl_phase, float fr_phase,
693			float bl_phase, float br_phase,
694			float sl_phase, float sr_phase,
695			float xl, float yl,
696			float xr, float yr,
697			int n)
698			{
699			float fl_mag, fr_mag, ls_mag, rs_mag, lb_mag, rb_mag;
700			float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb, *dstlfe;
701		✗	AudioSurroundContext *s = ctx->priv;
702
703		✗	dstl = (float *)s->output->extended_data[0];
704		✗	dstr = (float *)s->output->extended_data[1];
705		✗	dstc = (float *)s->output->extended_data[2];
706		✗	dstlfe = (float *)s->output->extended_data[3];
707		✗	dstlb = (float *)s->output->extended_data[4];
708		✗	dstrb = (float *)s->output->extended_data[5];
709		✗	dstls = (float *)s->output->extended_data[6];
710		✗	dstrs = (float *)s->output->extended_data[7];
711
712		✗	fl_mag = powf(.5f * (xl + 1.f), s->f_x[SC_FL]) * powf((yl + 1.f) * .5f, s->f_y[SC_FL]) * mag_totall;
713		✗	fr_mag = powf(.5f * (xr + 1.f), s->f_x[SC_FR]) * powf((yr + 1.f) * .5f, s->f_y[SC_FR]) * mag_totalr;
714		✗	lb_mag = powf(.5f * (-xl + 1.f), s->f_x[SC_BL]) * powf((yl + 1.f) * .5f, s->f_y[SC_BL]) * mag_totall;
715		✗	rb_mag = powf(.5f * (-xr + 1.f), s->f_x[SC_BR]) * powf((yr + 1.f) * .5f, s->f_y[SC_BR]) * mag_totalr;
716		✗	ls_mag = powf(1.f - fabsf(xl), s->f_x[SC_SL]) * powf((yl + 1.f) * .5f, s->f_y[SC_SL]) * mag_totall;
717		✗	rs_mag = powf(1.f - fabsf(xr), s->f_x[SC_SR]) * powf((yr + 1.f) * .5f, s->f_y[SC_SR]) * mag_totalr;
718
719		✗	dstl[2 * n ] = fl_mag * cosf(fl_phase);
720		✗	dstl[2 * n + 1] = fl_mag * sinf(fl_phase);
721
722		✗	dstr[2 * n ] = fr_mag * cosf(fr_phase);
723		✗	dstr[2 * n + 1] = fr_mag * sinf(fr_phase);
724
725		✗	dstc[2 * n ] = c_re;
726		✗	dstc[2 * n + 1] = c_im;
727
728		✗	dstlfe[2 * n ] = lfe_re;
729		✗	dstlfe[2 * n + 1] = lfe_im;
730
731		✗	dstlb[2 * n ] = lb_mag * cosf(bl_phase);
732		✗	dstlb[2 * n + 1] = lb_mag * sinf(bl_phase);
733
734		✗	dstrb[2 * n ] = rb_mag * cosf(br_phase);
735		✗	dstrb[2 * n + 1] = rb_mag * sinf(br_phase);
736
737		✗	dstls[2 * n ] = ls_mag * cosf(sl_phase);
738		✗	dstls[2 * n + 1] = ls_mag * sinf(sl_phase);
739
740		✗	dstrs[2 * n ] = rs_mag * cosf(sr_phase);
741		✗	dstrs[2 * n + 1] = rs_mag * sinf(sr_phase);
742		✗	}
743
744		✗	static void filter_stereo(AVFilterContext *ctx)
745			{
746		✗	AudioSurroundContext *s = ctx->priv;
747		✗	const float *srcl = (const float *)s->input->extended_data[0];
748		✗	const float *srcr = (const float *)s->input->extended_data[1];
749		✗	const int output_lfe = s->output_lfe && s->create_lfe;
750		✗	const int rdft_size = s->rdft_size;
751		✗	const int lfe_mode = s->lfe_mode;
752		✗	const float highcut = s->highcut;
753		✗	const float lowcut = s->lowcut;
754		✗	const float angle = s->angle;
755		✗	const float focus = s->focus;
756		✗	float *magtotal = s->mag_total;
757		✗	float *lfemag = s->lfe_mag;
758		✗	float *lphase = s->l_phase;
759		✗	float *rphase = s->r_phase;
760		✗	float *cphase = s->c_phase;
761		✗	float *cmag = s->c_mag;
762		✗	float *xpos = s->x_pos;
763		✗	float *ypos = s->y_pos;
764
765		✗	for (int n = 0; n < rdft_size; n++) {
766		✗	float l_re = srcl[2 * n], r_re = srcr[2 * n];
767		✗	float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
768		✗	float c_phase = atan2f(l_im + r_im, l_re + r_re);
769		✗	float l_mag = hypotf(l_re, l_im);
770		✗	float r_mag = hypotf(r_re, r_im);
771		✗	float mag_total = hypotf(l_mag, r_mag);
772		✗	float l_phase = atan2f(l_im, l_re);
773		✗	float r_phase = atan2f(r_im, r_re);
774		✗	float phase_dif = fabsf(l_phase - r_phase);
775		✗	float mag_sum = l_mag + r_mag;
776		✗	float c_mag = mag_sum * 0.5f;
777			float mag_dif, x, y;
778
779		✗	mag_sum = mag_sum < MIN_MAG_SUM ? 1.f : mag_sum;
780		✗	mag_dif = (l_mag - r_mag) / mag_sum;
781		✗	if (phase_dif > M_PIf)
782		✗	phase_dif = 2.f * M_PIf - phase_dif;
783
784		✗	stereo_position(mag_dif, phase_dif, &x, &y);
785		✗	angle_transform(&x, &y, angle);
786		✗	focus_transform(&x, &y, focus);
787		✗	get_lfe(output_lfe, n, lowcut, highcut, &lfemag[n], c_mag, &mag_total, lfe_mode);
788
789		✗	xpos[n] = x;
790		✗	ypos[n] = y;
791		✗	lphase[n] = l_phase;
792		✗	rphase[n] = r_phase;
793		✗	cmag[n] = c_mag;
794		✗	cphase[n] = c_phase;
795		✗	magtotal[n] = mag_total;
796			}
797		✗	}
798
799		✗	static void filter_2_1(AVFilterContext *ctx)
800			{
801		✗	AudioSurroundContext *s = ctx->priv;
802		✗	const float *srcl = (const float *)s->input->extended_data[0];
803		✗	const float *srcr = (const float *)s->input->extended_data[1];
804		✗	const float *srclfe = (const float *)s->input->extended_data[2];
805		✗	const int rdft_size = s->rdft_size;
806		✗	const float angle = s->angle;
807		✗	const float focus = s->focus;
808		✗	float *magtotal = s->mag_total;
809		✗	float *lfephase = s->lfe_phase;
810		✗	float *lfemag = s->lfe_mag;
811		✗	float *lphase = s->l_phase;
812		✗	float *rphase = s->r_phase;
813		✗	float *cphase = s->c_phase;
814		✗	float *cmag = s->c_mag;
815		✗	float *xpos = s->x_pos;
816		✗	float *ypos = s->y_pos;
817
818		✗	for (int n = 0; n < rdft_size; n++) {
819		✗	float l_re = srcl[2 * n], r_re = srcr[2 * n];
820		✗	float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
821		✗	float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
822		✗	float c_phase = atan2f(l_im + r_im, l_re + r_re);
823		✗	float l_mag = hypotf(l_re, l_im);
824		✗	float r_mag = hypotf(r_re, r_im);
825		✗	float lfe_mag = hypotf(lfe_re, lfe_im);
826		✗	float lfe_phase = atan2f(lfe_im, lfe_re);
827		✗	float mag_total = hypotf(l_mag, r_mag);
828		✗	float l_phase = atan2f(l_im, l_re);
829		✗	float r_phase = atan2f(r_im, r_re);
830		✗	float phase_dif = fabsf(l_phase - r_phase);
831		✗	float mag_sum = l_mag + r_mag;
832		✗	float c_mag = mag_sum * 0.5f;
833			float mag_dif, x, y;
834
835		✗	mag_sum = mag_sum < MIN_MAG_SUM ? 1.f : mag_sum;
836		✗	mag_dif = (l_mag - r_mag) / mag_sum;
837		✗	if (phase_dif > M_PIf)
838		✗	phase_dif = 2.f * M_PIf - phase_dif;
839
840		✗	stereo_position(mag_dif, phase_dif, &x, &y);
841		✗	angle_transform(&x, &y, angle);
842		✗	focus_transform(&x, &y, focus);
843
844		✗	xpos[n] = x;
845		✗	ypos[n] = y;
846		✗	lphase[n] = l_phase;
847		✗	rphase[n] = r_phase;
848		✗	cmag[n] = c_mag;
849		✗	cphase[n] = c_phase;
850		✗	lfemag[n] = lfe_mag;
851		✗	lfephase[n] = lfe_phase;
852		✗	magtotal[n] = mag_total;
853			}
854		✗	}
855
856		✗	static void filter_surround(AVFilterContext *ctx)
857			{
858		✗	AudioSurroundContext *s = ctx->priv;
859		✗	const float *srcl = (const float *)s->input->extended_data[0];
860		✗	const float *srcr = (const float *)s->input->extended_data[1];
861		✗	const float *srcc = (const float *)s->input->extended_data[2];
862		✗	const int output_lfe = s->output_lfe && s->create_lfe;
863		✗	const int rdft_size = s->rdft_size;
864		✗	const int lfe_mode = s->lfe_mode;
865		✗	const float highcut = s->highcut;
866		✗	const float lowcut = s->lowcut;
867		✗	const float angle = s->angle;
868		✗	const float focus = s->focus;
869		✗	float *magtotal = s->mag_total;
870		✗	float *lfemag = s->lfe_mag;
871		✗	float *lphase = s->l_phase;
872		✗	float *rphase = s->r_phase;
873		✗	float *cphase = s->c_phase;
874		✗	float *cmag = s->c_mag;
875		✗	float *xpos = s->x_pos;
876		✗	float *ypos = s->y_pos;
877
878		✗	for (int n = 0; n < rdft_size; n++) {
879		✗	float l_re = srcl[2 * n], r_re = srcr[2 * n];
880		✗	float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
881		✗	float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
882		✗	float c_phase = atan2f(c_im, c_re);
883		✗	float c_mag = hypotf(c_re, c_im);
884		✗	float l_mag = hypotf(l_re, l_im);
885		✗	float r_mag = hypotf(r_re, r_im);
886		✗	float mag_total = hypotf(l_mag, r_mag);
887		✗	float l_phase = atan2f(l_im, l_re);
888		✗	float r_phase = atan2f(r_im, r_re);
889		✗	float phase_dif = fabsf(l_phase - r_phase);
890		✗	float mag_sum = l_mag + r_mag;
891			float mag_dif, x, y;
892
893		✗	mag_sum = mag_sum < MIN_MAG_SUM ? 1.f : mag_sum;
894		✗	mag_dif = (l_mag - r_mag) / mag_sum;
895		✗	if (phase_dif > M_PIf)
896		✗	phase_dif = 2.f * M_PIf - phase_dif;
897
898		✗	stereo_position(mag_dif, phase_dif, &x, &y);
899		✗	angle_transform(&x, &y, angle);
900		✗	focus_transform(&x, &y, focus);
901		✗	get_lfe(output_lfe, n, lowcut, highcut, &lfemag[n], c_mag, &mag_total, lfe_mode);
902
903		✗	xpos[n] = x;
904		✗	ypos[n] = y;
905		✗	lphase[n] = l_phase;
906		✗	rphase[n] = r_phase;
907		✗	cmag[n] = c_mag;
908		✗	cphase[n] = c_phase;
909		✗	magtotal[n] = mag_total;
910			}
911		✗	}
912
913		✗	static void filter_5_0_side(AVFilterContext *ctx)
914			{
915		✗	AudioSurroundContext *s = ctx->priv;
916		✗	const int rdft_size = s->rdft_size;
917			float *srcl, *srcr, *srcc, *srcsl, *srcsr;
918			int n;
919
920		✗	srcl = (float *)s->input->extended_data[0];
921		✗	srcr = (float *)s->input->extended_data[1];
922		✗	srcc = (float *)s->input->extended_data[2];
923		✗	srcsl = (float *)s->input->extended_data[3];
924		✗	srcsr = (float *)s->input->extended_data[4];
925
926		✗	for (n = 0; n < rdft_size; n++) {
927		✗	float fl_re = srcl[2 * n], fr_re = srcr[2 * n];
928		✗	float fl_im = srcl[2 * n + 1], fr_im = srcr[2 * n + 1];
929		✗	float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
930		✗	float sl_re = srcsl[2 * n], sl_im = srcsl[2 * n + 1];
931		✗	float sr_re = srcsr[2 * n], sr_im = srcsr[2 * n + 1];
932		✗	float fl_mag = hypotf(fl_re, fl_im);
933		✗	float fr_mag = hypotf(fr_re, fr_im);
934		✗	float fl_phase = atan2f(fl_im, fl_re);
935		✗	float fr_phase = atan2f(fr_im, fr_re);
936		✗	float sl_mag = hypotf(sl_re, sl_im);
937		✗	float sr_mag = hypotf(sr_re, sr_im);
938		✗	float sl_phase = atan2f(sl_im, sl_re);
939		✗	float sr_phase = atan2f(sr_im, sr_re);
940		✗	float phase_difl = fabsf(fl_phase - sl_phase);
941		✗	float phase_difr = fabsf(fr_phase - sr_phase);
942		✗	float magl_sum = fl_mag + sl_mag;
943		✗	float magr_sum = fr_mag + sr_mag;
944		✗	float mag_difl = magl_sum < MIN_MAG_SUM ? FFDIFFSIGN(fl_mag, sl_mag) : (fl_mag - sl_mag) / magl_sum;
945		✗	float mag_difr = magr_sum < MIN_MAG_SUM ? FFDIFFSIGN(fr_mag, sr_mag) : (fr_mag - sr_mag) / magr_sum;
946		✗	float mag_totall = hypotf(fl_mag, sl_mag);
947		✗	float mag_totalr = hypotf(fr_mag, sr_mag);
948		✗	float bl_phase = atan2f(fl_im + sl_im, fl_re + sl_re);
949		✗	float br_phase = atan2f(fr_im + sr_im, fr_re + sr_re);
950			float xl, yl;
951			float xr, yr;
952
953		✗	if (phase_difl > M_PIf)
954		✗	phase_difl = 2.f * M_PIf - phase_difl;
955
956		✗	if (phase_difr > M_PIf)
957		✗	phase_difr = 2.f * M_PIf - phase_difr;
958
959		✗	stereo_position(mag_difl, phase_difl, &xl, &yl);
960		✗	stereo_position(mag_difr, phase_difr, &xr, &yr);
961
962		✗	s->upmix_5_0(ctx, c_re, c_im,
963			mag_totall, mag_totalr,
964			fl_phase, fr_phase,
965			bl_phase, br_phase,
966			sl_phase, sr_phase,
967			xl, yl, xr, yr, n);
968			}
969		✗	}
970
971		✗	static void filter_5_1_side(AVFilterContext *ctx)
972			{
973		✗	AudioSurroundContext *s = ctx->priv;
974		✗	const int rdft_size = s->rdft_size;
975			float *srcl, *srcr, *srcc, *srclfe, *srcsl, *srcsr;
976			int n;
977
978		✗	srcl = (float *)s->input->extended_data[0];
979		✗	srcr = (float *)s->input->extended_data[1];
980		✗	srcc = (float *)s->input->extended_data[2];
981		✗	srclfe = (float *)s->input->extended_data[3];
982		✗	srcsl = (float *)s->input->extended_data[4];
983		✗	srcsr = (float *)s->input->extended_data[5];
984
985		✗	for (n = 0; n < rdft_size; n++) {
986		✗	float fl_re = srcl[2 * n], fr_re = srcr[2 * n];
987		✗	float fl_im = srcl[2 * n + 1], fr_im = srcr[2 * n + 1];
988		✗	float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
989		✗	float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
990		✗	float sl_re = srcsl[2 * n], sl_im = srcsl[2 * n + 1];
991		✗	float sr_re = srcsr[2 * n], sr_im = srcsr[2 * n + 1];
992		✗	float fl_mag = hypotf(fl_re, fl_im);
993		✗	float fr_mag = hypotf(fr_re, fr_im);
994		✗	float fl_phase = atan2f(fl_im, fl_re);
995		✗	float fr_phase = atan2f(fr_im, fr_re);
996		✗	float sl_mag = hypotf(sl_re, sl_im);
997		✗	float sr_mag = hypotf(sr_re, sr_im);
998		✗	float sl_phase = atan2f(sl_im, sl_re);
999		✗	float sr_phase = atan2f(sr_im, sr_re);
1000		✗	float phase_difl = fabsf(fl_phase - sl_phase);
1001		✗	float phase_difr = fabsf(fr_phase - sr_phase);
1002		✗	float magl_sum = fl_mag + sl_mag;
1003		✗	float magr_sum = fr_mag + sr_mag;
1004		✗	float mag_difl = magl_sum < MIN_MAG_SUM ? FFDIFFSIGN(fl_mag, sl_mag) : (fl_mag - sl_mag) / magl_sum;
1005		✗	float mag_difr = magr_sum < MIN_MAG_SUM ? FFDIFFSIGN(fr_mag, sr_mag) : (fr_mag - sr_mag) / magr_sum;
1006		✗	float mag_totall = hypotf(fl_mag, sl_mag);
1007		✗	float mag_totalr = hypotf(fr_mag, sr_mag);
1008		✗	float bl_phase = atan2f(fl_im + sl_im, fl_re + sl_re);
1009		✗	float br_phase = atan2f(fr_im + sr_im, fr_re + sr_re);
1010			float xl, yl;
1011			float xr, yr;
1012
1013		✗	if (phase_difl > M_PIf)
1014		✗	phase_difl = 2.f * M_PIf - phase_difl;
1015
1016		✗	if (phase_difr > M_PIf)
1017		✗	phase_difr = 2.f * M_PIf - phase_difr;
1018
1019		✗	stereo_position(mag_difl, phase_difl, &xl, &yl);
1020		✗	stereo_position(mag_difr, phase_difr, &xr, &yr);
1021
1022		✗	s->upmix_5_1(ctx, c_re, c_im, lfe_re, lfe_im,
1023			mag_totall, mag_totalr,
1024			fl_phase, fr_phase,
1025			bl_phase, br_phase,
1026			sl_phase, sr_phase,
1027			xl, yl, xr, yr, n);
1028			}
1029		✗	}
1030
1031		✗	static void filter_5_1_back(AVFilterContext *ctx)
1032			{
1033		✗	AudioSurroundContext *s = ctx->priv;
1034		✗	const int rdft_size = s->rdft_size;
1035			float *srcl, *srcr, *srcc, *srclfe, *srcbl, *srcbr;
1036			int n;
1037
1038		✗	srcl = (float *)s->input->extended_data[0];
1039		✗	srcr = (float *)s->input->extended_data[1];
1040		✗	srcc = (float *)s->input->extended_data[2];
1041		✗	srclfe = (float *)s->input->extended_data[3];
1042		✗	srcbl = (float *)s->input->extended_data[4];
1043		✗	srcbr = (float *)s->input->extended_data[5];
1044
1045		✗	for (n = 0; n < rdft_size; n++) {
1046		✗	float fl_re = srcl[2 * n], fr_re = srcr[2 * n];
1047		✗	float fl_im = srcl[2 * n + 1], fr_im = srcr[2 * n + 1];
1048		✗	float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
1049		✗	float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
1050		✗	float bl_re = srcbl[2 * n], bl_im = srcbl[2 * n + 1];
1051		✗	float br_re = srcbr[2 * n], br_im = srcbr[2 * n + 1];
1052		✗	float fl_mag = hypotf(fl_re, fl_im);
1053		✗	float fr_mag = hypotf(fr_re, fr_im);
1054		✗	float fl_phase = atan2f(fl_im, fl_re);
1055		✗	float fr_phase = atan2f(fr_im, fr_re);
1056		✗	float bl_mag = hypotf(bl_re, bl_im);
1057		✗	float br_mag = hypotf(br_re, br_im);
1058		✗	float bl_phase = atan2f(bl_im, bl_re);
1059		✗	float br_phase = atan2f(br_im, br_re);
1060		✗	float phase_difl = fabsf(fl_phase - bl_phase);
1061		✗	float phase_difr = fabsf(fr_phase - br_phase);
1062		✗	float magl_sum = fl_mag + bl_mag;
1063		✗	float magr_sum = fr_mag + br_mag;
1064		✗	float mag_difl = magl_sum < MIN_MAG_SUM ? FFDIFFSIGN(fl_mag, bl_mag) : (fl_mag - bl_mag) / magl_sum;
1065		✗	float mag_difr = magr_sum < MIN_MAG_SUM ? FFDIFFSIGN(fr_mag, br_mag) : (fr_mag - br_mag) / magr_sum;
1066		✗	float mag_totall = hypotf(fl_mag, bl_mag);
1067		✗	float mag_totalr = hypotf(fr_mag, br_mag);
1068		✗	float sl_phase = atan2f(fl_im + bl_im, fl_re + bl_re);
1069		✗	float sr_phase = atan2f(fr_im + br_im, fr_re + br_re);
1070			float xl, yl;
1071			float xr, yr;
1072
1073		✗	if (phase_difl > M_PIf)
1074		✗	phase_difl = 2.f * M_PIf - phase_difl;
1075
1076		✗	if (phase_difr > M_PIf)
1077		✗	phase_difr = 2.f * M_PIf - phase_difr;
1078
1079		✗	stereo_position(mag_difl, phase_difl, &xl, &yl);
1080		✗	stereo_position(mag_difr, phase_difr, &xr, &yr);
1081
1082		✗	s->upmix_5_1(ctx, c_re, c_im, lfe_re, lfe_im,
1083			mag_totall, mag_totalr,
1084			fl_phase, fr_phase,
1085			bl_phase, br_phase,
1086			sl_phase, sr_phase,
1087			xl, yl, xr, yr, n);
1088			}
1089		✗	}
1090
1091		✗	static void allchannels_spread(AVFilterContext *ctx)
1092			{
1093		✗	AudioSurroundContext *s = ctx->priv;
1094
1095		✗	if (s->all_x >= 0.f)
1096		✗	for (int n = 0; n < SC_NB; n++)
1097		✗	s->f_x[n] = s->all_x;
1098		✗	s->all_x = -1.f;
1099		✗	if (s->all_y >= 0.f)
1100		✗	for (int n = 0; n < SC_NB; n++)
1101		✗	s->f_y[n] = s->all_y;
1102		✗	s->all_y = -1.f;
1103		✗	}
1104
1105		✗	static av_cold int init(AVFilterContext *ctx)
1106			{
1107		✗	AudioSurroundContext *s = ctx->priv;
1108			int64_t in_channel_layout, out_channel_layout;
1109			char in_name[128], out_name[128];
1110			float overlap;
1111
1112		✗	if (s->lowcutf >= s->highcutf) {
1113		✗	av_log(ctx, AV_LOG_ERROR, "Low cut-off '%d' should be less than high cut-off '%d'.\n",
1114			s->lowcutf, s->highcutf);
1115		✗	return AVERROR(EINVAL);
1116			}
1117
1118		✗	in_channel_layout = s->in_ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?
1119		✗	s->in_ch_layout.u.mask : 0;
1120		✗	out_channel_layout = s->out_ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?
1121		✗	s->out_ch_layout.u.mask : 0;
1122
1123		✗	s->create_lfe = av_channel_layout_index_from_channel(&s->out_ch_layout,
1124		✗	AV_CHAN_LOW_FREQUENCY) >= 0;
1125
1126		✗	switch (in_channel_layout) {
1127		✗	case AV_CH_LAYOUT_STEREO:
1128		✗	s->filter = filter_stereo;
1129		✗	s->upmix = stereo_upmix;
1130		✗	break;
1131		✗	case AV_CH_LAYOUT_2POINT1:
1132		✗	s->filter = filter_2_1;
1133		✗	s->upmix = l2_1_upmix;
1134		✗	break;
1135		✗	case AV_CH_LAYOUT_SURROUND:
1136		✗	s->filter = filter_surround;
1137		✗	s->upmix = surround_upmix;
1138		✗	break;
1139		✗	case AV_CH_LAYOUT_5POINT0:
1140		✗	s->filter = filter_5_0_side;
1141			switch (out_channel_layout) {
1142		✗	case AV_CH_LAYOUT_7POINT1:
1143		✗	s->upmix_5_0 = upmix_7_1_5_0_side;
1144		✗	break;
1145		✗	default:
1146		✗	goto fail;
1147			}
1148		✗	break;
1149		✗	case AV_CH_LAYOUT_5POINT1:
1150		✗	s->filter = filter_5_1_side;
1151			switch (out_channel_layout) {
1152		✗	case AV_CH_LAYOUT_7POINT1:
1153		✗	s->upmix_5_1 = upmix_7_1_5_1;
1154		✗	break;
1155		✗	default:
1156		✗	goto fail;
1157			}
1158		✗	break;
1159		✗	case AV_CH_LAYOUT_5POINT1_BACK:
1160		✗	s->filter = filter_5_1_back;
1161			switch (out_channel_layout) {
1162		✗	case AV_CH_LAYOUT_7POINT1:
1163		✗	s->upmix_5_1 = upmix_7_1_5_1;
1164		✗	break;
1165		✗	default:
1166		✗	goto fail;
1167			}
1168		✗	break;
1169			default:
1170		✗	fail:
1171		✗	av_channel_layout_describe(&s->out_ch_layout, out_name, sizeof(out_name));
1172		✗	av_channel_layout_describe(&s->in_ch_layout, in_name, sizeof(in_name));
1173		✗	av_log(ctx, AV_LOG_ERROR, "Unsupported upmix: '%s' -> '%s'.\n",
1174			in_name, out_name);
1175		✗	return AVERROR(EINVAL);
1176			}
1177
1178		✗	s->window_func_lut = av_calloc(s->win_size, sizeof(*s->window_func_lut));
1179		✗	if (!s->window_func_lut)
1180		✗	return AVERROR(ENOMEM);
1181
1182		✗	generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap);
1183		✗	if (s->overlap == 1)
1184		✗	s->overlap = overlap;
1185
1186		✗	for (int i = 0; i < s->win_size; i++)
1187		✗	s->window_func_lut[i] = sqrtf(s->window_func_lut[i] / s->win_size);
1188		✗	s->hop_size = FFMAX(1, s->win_size * (1. - s->overlap));
1189
1190			{
1191		✗	float max = 0.f, *temp_lut = av_calloc(s->win_size, sizeof(*temp_lut));
1192		✗	if (!temp_lut)
1193		✗	return AVERROR(ENOMEM);
1194
1195		✗	for (int j = 0; j < s->win_size; j += s->hop_size) {
1196		✗	for (int i = 0; i < s->win_size; i++)
1197		✗	temp_lut[(i + j) % s->win_size] += s->window_func_lut[i];
1198			}
1199
1200		✗	for (int i = 0; i < s->win_size; i++)
1201		✗	max = fmaxf(temp_lut[i], max);
1202		✗	av_freep(&temp_lut);
1203
1204		✗	s->win_gain = 1.f / (max * sqrtf(s->win_size));
1205			}
1206
1207		✗	allchannels_spread(ctx);
1208
1209		✗	return 0;
1210			}
1211
1212		✗	static int fft_channel(AVFilterContext *ctx, AVFrame *in, int ch)
1213			{
1214		✗	AudioSurroundContext *s = ctx->priv;
1215		✗	float *src = (float *)s->input_in->extended_data[ch];
1216		✗	float *win = (float *)s->window->extended_data[ch];
1217		✗	const float *window_func_lut = s->window_func_lut;
1218		✗	const int offset = s->win_size - s->hop_size;
1219		✗	const float level_in = s->input_levels[ch];
1220		✗	const int win_size = s->win_size;
1221
1222		✗	memmove(src, &src[s->hop_size], offset * sizeof(float));
1223		✗	memcpy(&src[offset], in->extended_data[ch], in->nb_samples * sizeof(float));
1224		✗	memset(&src[offset + in->nb_samples], 0, (s->hop_size - in->nb_samples) * sizeof(float));
1225
1226		✗	for (int n = 0; n < win_size; n++)
1227		✗	win[n] = src[n] * window_func_lut[n] * level_in;
1228
1229		✗	s->tx_fn(s->rdft[ch], (float *)s->input->extended_data[ch], win, sizeof(float));
1230
1231		✗	return 0;
1232			}
1233
1234		✗	static int fft_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
1235			{
1236		✗	AVFrame *in = arg;
1237		✗	const int start = (in->ch_layout.nb_channels * jobnr) / nb_jobs;
1238		✗	const int end = (in->ch_layout.nb_channels * (jobnr+1)) / nb_jobs;
1239
1240		✗	for (int ch = start; ch < end; ch++)
1241		✗	fft_channel(ctx, in, ch);
1242
1243		✗	return 0;
1244			}
1245
1246		✗	static int ifft_channel(AVFilterContext *ctx, AVFrame *out, int ch)
1247			{
1248		✗	AudioSurroundContext *s = ctx->priv;
1249		✗	const float level_out = s->output_levels[ch] * s->win_gain;
1250		✗	const float *window_func_lut = s->window_func_lut;
1251		✗	const int win_size = s->win_size;
1252			float *dst, *ptr;
1253
1254		✗	dst = (float *)s->output_out->extended_data[ch];
1255		✗	ptr = (float *)s->overlap_buffer->extended_data[ch];
1256		✗	s->itx_fn(s->irdft[ch], dst, (float *)s->output->extended_data[ch], sizeof(AVComplexFloat));
1257
1258		✗	memmove(s->overlap_buffer->extended_data[ch],
1259		✗	s->overlap_buffer->extended_data[ch] + s->hop_size * sizeof(float),
1260		✗	s->win_size * sizeof(float));
1261		✗	memset(s->overlap_buffer->extended_data[ch] + s->win_size * sizeof(float),
1262		✗	0, s->hop_size * sizeof(float));
1263
1264		✗	for (int n = 0; n < win_size; n++)
1265		✗	ptr[n] += dst[n] * window_func_lut[n] * level_out;
1266
1267		✗	ptr = (float *)s->overlap_buffer->extended_data[ch];
1268		✗	dst = (float *)out->extended_data[ch];
1269		✗	memcpy(dst, ptr, s->hop_size * sizeof(float));
1270
1271		✗	return 0;
1272			}
1273
1274		✗	static int ifft_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
1275			{
1276		✗	AudioSurroundContext *s = ctx->priv;
1277		✗	AVFrame *out = arg;
1278		✗	const int start = (out->ch_layout.nb_channels * jobnr) / nb_jobs;
1279		✗	const int end = (out->ch_layout.nb_channels * (jobnr+1)) / nb_jobs;
1280
1281		✗	for (int ch = start; ch < end; ch++) {
1282		✗	if (s->upmix)
1283		✗	s->upmix(ctx, ch);
1284		✗	ifft_channel(ctx, out, ch);
1285			}
1286
1287		✗	return 0;
1288			}
1289
1290		✗	static int filter_frame(AVFilterLink *inlink, AVFrame *in)
1291			{
1292		✗	AVFilterContext *ctx = inlink->dst;
1293		✗	AVFilterLink *outlink = ctx->outputs[0];
1294		✗	AudioSurroundContext *s = ctx->priv;
1295			AVFrame *out;
1296
1297		✗	ff_filter_execute(ctx, fft_channels, in, NULL,
1298		✗	FFMIN(inlink->ch_layout.nb_channels,
1299			ff_filter_get_nb_threads(ctx)));
1300
1301		✗	s->filter(ctx);
1302
1303		✗	out = ff_get_audio_buffer(outlink, s->hop_size);
1304		✗	if (!out)
1305		✗	return AVERROR(ENOMEM);
1306
1307		✗	ff_filter_execute(ctx, ifft_channels, out, NULL,
1308		✗	FFMIN(outlink->ch_layout.nb_channels,
1309			ff_filter_get_nb_threads(ctx)));
1310
1311		✗	av_frame_copy_props(out, in);
1312		✗	out->nb_samples = in->nb_samples;
1313
1314		✗	av_frame_free(&in);
1315		✗	return ff_filter_frame(outlink, out);
1316			}
1317
1318		✗	static int activate(AVFilterContext *ctx)
1319			{
1320		✗	AVFilterLink *inlink = ctx->inputs[0];
1321		✗	AVFilterLink *outlink = ctx->outputs[0];
1322		✗	AudioSurroundContext *s = ctx->priv;
1323		✗	AVFrame *in = NULL;
1324		✗	int ret = 0, status;
1325			int64_t pts;
1326
1327		✗	FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
1328
1329		✗	ret = ff_inlink_consume_samples(inlink, s->hop_size, s->hop_size, &in);
1330		✗	if (ret < 0)
1331		✗	return ret;
1332
1333		✗	if (ret > 0)
1334		✗	ret = filter_frame(inlink, in);
1335		✗	if (ret < 0)
1336		✗	return ret;
1337
1338		✗	if (ff_inlink_queued_samples(inlink) >= s->hop_size) {
1339		✗	ff_filter_set_ready(ctx, 10);
1340		✗	return 0;
1341			}
1342
1343		✗	if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
1344		✗	ff_outlink_set_status(outlink, status, pts);
1345		✗	return 0;
1346			}
1347
1348		✗	FF_FILTER_FORWARD_WANTED(outlink, inlink);
1349
1350		✗	return FFERROR_NOT_READY;
1351			}
1352
1353		✗	static av_cold void uninit(AVFilterContext *ctx)
1354			{
1355		✗	AudioSurroundContext *s = ctx->priv;
1356
1357		✗	av_frame_free(&s->factors);
1358		✗	av_frame_free(&s->sfactors);
1359		✗	av_frame_free(&s->window);
1360		✗	av_frame_free(&s->input_in);
1361		✗	av_frame_free(&s->input);
1362		✗	av_frame_free(&s->output);
1363		✗	av_frame_free(&s->output_ph);
1364		✗	av_frame_free(&s->output_mag);
1365		✗	av_frame_free(&s->output_out);
1366		✗	av_frame_free(&s->overlap_buffer);
1367
1368		✗	for (int ch = 0; ch < s->nb_in_channels; ch++)
1369		✗	av_tx_uninit(&s->rdft[ch]);
1370		✗	for (int ch = 0; ch < s->nb_out_channels; ch++)
1371		✗	av_tx_uninit(&s->irdft[ch]);
1372		✗	av_freep(&s->input_levels);
1373		✗	av_freep(&s->output_levels);
1374		✗	av_freep(&s->rdft);
1375		✗	av_freep(&s->irdft);
1376		✗	av_freep(&s->window_func_lut);
1377
1378		✗	av_freep(&s->x_pos);
1379		✗	av_freep(&s->y_pos);
1380		✗	av_freep(&s->l_phase);
1381		✗	av_freep(&s->r_phase);
1382		✗	av_freep(&s->c_mag);
1383		✗	av_freep(&s->c_phase);
1384		✗	av_freep(&s->mag_total);
1385		✗	av_freep(&s->lfe_mag);
1386		✗	av_freep(&s->lfe_phase);
1387		✗	}
1388
1389		✗	static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
1390			char *res, int res_len, int flags)
1391			{
1392		✗	AudioSurroundContext *s = ctx->priv;
1393			int ret;
1394
1395		✗	ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
1396		✗	if (ret < 0)
1397		✗	return ret;
1398
1399		✗	s->hop_size = FFMAX(1, s->win_size * (1. - s->overlap));
1400
1401		✗	allchannels_spread(ctx);
1402		✗	set_input_levels(ctx);
1403		✗	set_output_levels(ctx);
1404
1405		✗	return 0;
1406			}
1407
1408			#define OFFSET(x) offsetof(AudioSurroundContext, x)
1409			#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
1410			#define TFLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
1411
1412			static const AVOption surround_options[] = {
1413			{ "chl_out", "set output channel layout", OFFSET(out_ch_layout), AV_OPT_TYPE_CHLAYOUT, {.str="5.1"}, 0, 0, FLAGS },
1414			{ "chl_in", "set input channel layout", OFFSET(in_ch_layout), AV_OPT_TYPE_CHLAYOUT, {.str="stereo"},0, 0, FLAGS },
1415			{ "level_in", "set input level", OFFSET(level_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1416			{ "level_out", "set output level", OFFSET(level_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1417			{ "lfe", "output LFE", OFFSET(output_lfe), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, TFLAGS },
1418			{ "lfe_low", "LFE low cut off", OFFSET(lowcutf), AV_OPT_TYPE_INT, {.i64=128}, 0, 256, FLAGS },
1419			{ "lfe_high", "LFE high cut off", OFFSET(highcutf), AV_OPT_TYPE_INT, {.i64=256}, 0, 512, FLAGS },
1420			{ "lfe_mode", "set LFE channel mode", OFFSET(lfe_mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, TFLAGS, .unit = "lfe_mode" },
1421			{ "add", "just add LFE channel", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 1, TFLAGS, .unit = "lfe_mode" },
1422			{ "sub", "subtract LFE channel with others", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 1, TFLAGS, .unit = "lfe_mode" },
1423			{ "smooth", "set temporal smoothness strength", OFFSET(smooth), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 1, TFLAGS },
1424			{ "angle", "set soundfield transform angle", OFFSET(angle), AV_OPT_TYPE_FLOAT, {.dbl=90}, 0, 360, TFLAGS },
1425			{ "focus", "set soundfield transform focus", OFFSET(focus), AV_OPT_TYPE_FLOAT, {.dbl=0}, -1, 1, TFLAGS },
1426			{ "fc_in", "set front center channel input level", OFFSET(f_i[SC_FC]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1427			{ "fc_out", "set front center channel output level", OFFSET(f_o[SC_FC]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1428			{ "fl_in", "set front left channel input level", OFFSET(f_i[SC_FL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1429			{ "fl_out", "set front left channel output level", OFFSET(f_o[SC_FL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1430			{ "fr_in", "set front right channel input level", OFFSET(f_i[SC_FR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1431			{ "fr_out", "set front right channel output level", OFFSET(f_o[SC_FR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1432			{ "sl_in", "set side left channel input level", OFFSET(f_i[SC_SL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1433			{ "sl_out", "set side left channel output level", OFFSET(f_o[SC_SL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1434			{ "sr_in", "set side right channel input level", OFFSET(f_i[SC_SR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1435			{ "sr_out", "set side right channel output level", OFFSET(f_o[SC_SR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1436			{ "bl_in", "set back left channel input level", OFFSET(f_i[SC_BL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1437			{ "bl_out", "set back left channel output level", OFFSET(f_o[SC_BL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1438			{ "br_in", "set back right channel input level", OFFSET(f_i[SC_BR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1439			{ "br_out", "set back right channel output level", OFFSET(f_o[SC_BR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1440			{ "bc_in", "set back center channel input level", OFFSET(f_i[SC_BC]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1441			{ "bc_out", "set back center channel output level", OFFSET(f_o[SC_BC]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1442			{ "lfe_in", "set lfe channel input level", OFFSET(f_i[SC_LF]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1443			{ "lfe_out", "set lfe channel output level", OFFSET(f_o[SC_LF]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1444			{ "allx", "set all channel's x spread", OFFSET(all_x), AV_OPT_TYPE_FLOAT, {.dbl=-1}, -1, 15, TFLAGS },
1445			{ "ally", "set all channel's y spread", OFFSET(all_y), AV_OPT_TYPE_FLOAT, {.dbl=-1}, -1, 15, TFLAGS },
1446			{ "fcx", "set front center channel x spread", OFFSET(f_x[SC_FC]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1447			{ "flx", "set front left channel x spread", OFFSET(f_x[SC_FL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1448			{ "frx", "set front right channel x spread", OFFSET(f_x[SC_FR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1449			{ "blx", "set back left channel x spread", OFFSET(f_x[SC_BL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1450			{ "brx", "set back right channel x spread", OFFSET(f_x[SC_BR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1451			{ "slx", "set side left channel x spread", OFFSET(f_x[SC_SL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1452			{ "srx", "set side right channel x spread", OFFSET(f_x[SC_SR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1453			{ "bcx", "set back center channel x spread", OFFSET(f_x[SC_BC]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1454			{ "fcy", "set front center channel y spread", OFFSET(f_y[SC_FC]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1455			{ "fly", "set front left channel y spread", OFFSET(f_y[SC_FL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1456			{ "fry", "set front right channel y spread", OFFSET(f_y[SC_FR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1457			{ "bly", "set back left channel y spread", OFFSET(f_y[SC_BL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1458			{ "bry", "set back right channel y spread", OFFSET(f_y[SC_BR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1459			{ "sly", "set side left channel y spread", OFFSET(f_y[SC_SL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1460			{ "sry", "set side right channel y spread", OFFSET(f_y[SC_SR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1461			{ "bcy", "set back center channel y spread", OFFSET(f_y[SC_BC]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1462			{ "win_size", "set window size", OFFSET(win_size), AV_OPT_TYPE_INT, {.i64=4096},1024,65536,FLAGS },
1463			WIN_FUNC_OPTION("win_func", OFFSET(win_func), FLAGS, WFUNC_HANNING),
1464			{ "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0, 1, TFLAGS },
1465			{ NULL }
1466			};
1467
1468			AVFILTER_DEFINE_CLASS(surround);
1469
1470			static const AVFilterPad inputs[] = {
1471			{
1472			.name = "default",
1473			.type = AVMEDIA_TYPE_AUDIO,
1474			.config_props = config_input,
1475			},
1476			};
1477
1478			static const AVFilterPad outputs[] = {
1479			{
1480			.name = "default",
1481			.type = AVMEDIA_TYPE_AUDIO,
1482			.config_props = config_output,
1483			},
1484			};
1485
1486			const AVFilter ff_af_surround = {
1487			.name = "surround",
1488			.description = NULL_IF_CONFIG_SMALL("Apply audio surround upmix filter."),
1489			.priv_size = sizeof(AudioSurroundContext),
1490			.priv_class = &surround_class,
1491			.init = init,
1492			.uninit = uninit,
1493			.activate = activate,
1494			FILTER_INPUTS(inputs),
1495			FILTER_OUTPUTS(outputs),
1496			FILTER_QUERY_FUNC(query_formats),
1497			.flags = AVFILTER_FLAG_SLICE_THREADS,
1498			.process_command = process_command,
1499			};
1500