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 "formats.h"
30			#include "window_func.h"
31
32			enum SurroundChannel {
33			SC_FL, SC_FR, SC_FC, SC_LF, SC_BL, SC_BR, SC_BC, SC_SL, SC_SR,
34			SC_NB,
35			};
36
37			static const int ch_map[SC_NB] = {
38			[SC_FL] = AV_CHAN_FRONT_LEFT,
39			[SC_FR] = AV_CHAN_FRONT_RIGHT,
40			[SC_FC] = AV_CHAN_FRONT_CENTER,
41			[SC_LF] = AV_CHAN_LOW_FREQUENCY,
42			[SC_BL] = AV_CHAN_BACK_LEFT,
43			[SC_BR] = AV_CHAN_BACK_RIGHT,
44			[SC_BC] = AV_CHAN_BACK_CENTER,
45			[SC_SL] = AV_CHAN_SIDE_LEFT,
46			[SC_SR] = AV_CHAN_SIDE_RIGHT,
47			};
48
49			static const int sc_map[16] = {
50			[AV_CHAN_FRONT_LEFT ] = SC_FL,
51			[AV_CHAN_FRONT_RIGHT ] = SC_FR,
52			[AV_CHAN_FRONT_CENTER ] = SC_FC,
53			[AV_CHAN_LOW_FREQUENCY] = SC_LF,
54			[AV_CHAN_BACK_LEFT ] = SC_BL,
55			[AV_CHAN_BACK_RIGHT ] = SC_BR,
56			[AV_CHAN_BACK_CENTER ] = SC_BC,
57			[AV_CHAN_SIDE_LEFT ] = SC_SL,
58			[AV_CHAN_SIDE_RIGHT ] = SC_SR,
59			};
60
61			typedef struct AudioSurroundContext {
62			const AVClass *class;
63
64			AVChannelLayout out_ch_layout;
65			AVChannelLayout in_ch_layout;
66
67			float level_in;
68			float level_out;
69			float f_i[SC_NB];
70			float f_o[SC_NB];
71			int lfe_mode;
72			float smooth;
73			float angle;
74			float focus;
75			int win_size;
76			int win_func;
77			float win_gain;
78			float overlap;
79
80			float all_x;
81			float all_y;
82
83			float f_x[SC_NB];
84			float f_y[SC_NB];
85
86			float *input_levels;
87			float *output_levels;
88			int output_lfe;
89			int create_lfe;
90			int lowcutf;
91			int highcutf;
92
93			float lowcut;
94			float highcut;
95
96			int nb_in_channels;
97			int nb_out_channels;
98
99			AVFrame *factors;
100			AVFrame *sfactors;
101			AVFrame *input_in;
102			AVFrame *input;
103			AVFrame *output;
104			AVFrame *output_mag;
105			AVFrame *output_ph;
106			AVFrame *output_out;
107			AVFrame *overlap_buffer;
108			AVFrame *window;
109
110			float *x_pos;
111			float *y_pos;
112			float *l_phase;
113			float *r_phase;
114			float *c_phase;
115			float *c_mag;
116			float *lfe_mag;
117			float *lfe_phase;
118			float *mag_total;
119
120			int rdft_size;
121			int hop_size;
122			AVTXContext **rdft, **irdft;
123			av_tx_fn tx_fn, itx_fn;
124			float *window_func_lut;
125
126			void (*filter)(AVFilterContext *ctx);
127			void (*upmix)(AVFilterContext *ctx, int ch);
128			void (*upmix_5_0)(AVFilterContext *ctx,
129			float c_re, float c_im,
130			float mag_totall, float mag_totalr,
131			float fl_phase, float fr_phase,
132			float bl_phase, float br_phase,
133			float sl_phase, float sr_phase,
134			float xl, float yl,
135			float xr, float yr,
136			int n);
137			void (*upmix_5_1)(AVFilterContext *ctx,
138			float c_re, float c_im,
139			float lfe_re, float lfe_im,
140			float mag_totall, float mag_totalr,
141			float fl_phase, float fr_phase,
142			float bl_phase, float br_phase,
143			float sl_phase, float sr_phase,
144			float xl, float yl,
145			float xr, float yr,
146			int n);
147			} AudioSurroundContext;
148
149		✗	static int query_formats(AVFilterContext *ctx)
150			{
151		✗	AudioSurroundContext *s = ctx->priv;
152		✗	AVFilterFormats *formats = NULL;
153		✗	AVFilterChannelLayouts *layouts = NULL;
154			int ret;
155
156		✗	ret = ff_add_format(&formats, AV_SAMPLE_FMT_FLTP);
157		✗	if (ret)
158		✗	return ret;
159		✗	ret = ff_set_common_formats(ctx, formats);
160		✗	if (ret)
161		✗	return ret;
162
163		✗	layouts = NULL;
164		✗	ret = ff_add_channel_layout(&layouts, &s->out_ch_layout);
165		✗	if (ret)
166		✗	return ret;
167
168		✗	ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->incfg.channel_layouts);
169		✗	if (ret)
170		✗	return ret;
171
172		✗	layouts = NULL;
173		✗	ret = ff_add_channel_layout(&layouts, &s->in_ch_layout);
174		✗	if (ret)
175		✗	return ret;
176
177		✗	ret = ff_channel_layouts_ref(layouts, &ctx->inputs[0]->outcfg.channel_layouts);
178		✗	if (ret)
179		✗	return ret;
180
181		✗	return ff_set_common_all_samplerates(ctx);
182			}
183
184		✗	static void set_input_levels(AVFilterContext *ctx)
185			{
186		✗	AudioSurroundContext *s = ctx->priv;
187
188		✗	for (int ch = 0; ch < s->nb_in_channels && s->level_in >= 0.f; ch++)
189		✗	s->input_levels[ch] = s->level_in;
190		✗	s->level_in = -1.f;
191
192		✗	for (int n = 0; n < SC_NB; n++) {
193		✗	const int ch = av_channel_layout_index_from_channel(&s->in_ch_layout, ch_map[n]);
194		✗	if (ch >= 0)
195		✗	s->input_levels[ch] = s->f_i[n];
196			}
197		✗	}
198
199		✗	static void set_output_levels(AVFilterContext *ctx)
200			{
201		✗	AudioSurroundContext *s = ctx->priv;
202
203		✗	for (int ch = 0; ch < s->nb_out_channels && s->level_out >= 0.f; ch++)
204		✗	s->output_levels[ch] = s->level_out;
205		✗	s->level_out = -1.f;
206
207		✗	for (int n = 0; n < SC_NB; n++) {
208		✗	const int ch = av_channel_layout_index_from_channel(&s->out_ch_layout, ch_map[n]);
209		✗	if (ch >= 0)
210		✗	s->output_levels[ch] = s->f_o[n];
211			}
212		✗	}
213
214		✗	static int config_input(AVFilterLink *inlink)
215			{
216		✗	AVFilterContext *ctx = inlink->dst;
217		✗	AudioSurroundContext *s = ctx->priv;
218			int ret;
219
220		✗	s->rdft = av_calloc(inlink->ch_layout.nb_channels, sizeof(*s->rdft));
221		✗	if (!s->rdft)
222		✗	return AVERROR(ENOMEM);
223		✗	s->nb_in_channels = inlink->ch_layout.nb_channels;
224
225		✗	for (int ch = 0; ch < inlink->ch_layout.nb_channels; ch++) {
226		✗	float scale = 1.f;
227
228		✗	ret = av_tx_init(&s->rdft[ch], &s->tx_fn, AV_TX_FLOAT_RDFT,
229			0, s->win_size, &scale, 0);
230		✗	if (ret < 0)
231		✗	return ret;
232			}
233
234		✗	s->input_levels = av_malloc_array(s->nb_in_channels, sizeof(*s->input_levels));
235		✗	if (!s->input_levels)
236		✗	return AVERROR(ENOMEM);
237
238		✗	set_input_levels(ctx);
239
240		✗	s->window = ff_get_audio_buffer(inlink, s->win_size * 2);
241		✗	if (!s->window)
242		✗	return AVERROR(ENOMEM);
243
244		✗	s->input_in = ff_get_audio_buffer(inlink, s->win_size * 2);
245		✗	if (!s->input_in)
246		✗	return AVERROR(ENOMEM);
247
248		✗	s->input = ff_get_audio_buffer(inlink, s->win_size + 2);
249		✗	if (!s->input)
250		✗	return AVERROR(ENOMEM);
251
252		✗	s->lowcut = 1.f * s->lowcutf / (inlink->sample_rate * 0.5) * (s->win_size / 2);
253		✗	s->highcut = 1.f * s->highcutf / (inlink->sample_rate * 0.5) * (s->win_size / 2);
254
255		✗	return 0;
256			}
257
258		✗	static int config_output(AVFilterLink *outlink)
259			{
260		✗	AVFilterContext *ctx = outlink->src;
261		✗	AudioSurroundContext *s = ctx->priv;
262			int ret;
263
264		✗	s->irdft = av_calloc(outlink->ch_layout.nb_channels, sizeof(*s->irdft));
265		✗	if (!s->irdft)
266		✗	return AVERROR(ENOMEM);
267		✗	s->nb_out_channels = outlink->ch_layout.nb_channels;
268
269		✗	for (int ch = 0; ch < outlink->ch_layout.nb_channels; ch++) {
270		✗	float iscale = 1.f;
271
272		✗	ret = av_tx_init(&s->irdft[ch], &s->itx_fn, AV_TX_FLOAT_RDFT,
273			1, s->win_size, &iscale, 0);
274		✗	if (ret < 0)
275		✗	return ret;
276			}
277
278		✗	s->output_levels = av_malloc_array(s->nb_out_channels, sizeof(*s->output_levels));
279		✗	if (!s->output_levels)
280		✗	return AVERROR(ENOMEM);
281
282		✗	set_output_levels(ctx);
283
284		✗	s->factors = ff_get_audio_buffer(outlink, s->win_size + 2);
285		✗	s->sfactors = ff_get_audio_buffer(outlink, s->win_size + 2);
286		✗	s->output_ph = ff_get_audio_buffer(outlink, s->win_size + 2);
287		✗	s->output_mag = ff_get_audio_buffer(outlink, s->win_size + 2);
288		✗	s->output_out = ff_get_audio_buffer(outlink, s->win_size + 2);
289		✗	s->output = ff_get_audio_buffer(outlink, s->win_size + 2);
290		✗	s->overlap_buffer = ff_get_audio_buffer(outlink, s->win_size * 2);
291		✗	if (!s->overlap_buffer || !s->output || !s->output_out || !s->output_mag ||
292		✗	!s->output_ph || !s->factors || !s->sfactors)
293		✗	return AVERROR(ENOMEM);
294
295		✗	s->rdft_size = s->win_size / 2 + 1;
296
297		✗	s->x_pos = av_calloc(s->rdft_size, sizeof(*s->x_pos));
298		✗	s->y_pos = av_calloc(s->rdft_size, sizeof(*s->y_pos));
299		✗	s->l_phase = av_calloc(s->rdft_size, sizeof(*s->l_phase));
300		✗	s->r_phase = av_calloc(s->rdft_size, sizeof(*s->r_phase));
301		✗	s->c_mag = av_calloc(s->rdft_size, sizeof(*s->c_mag));
302		✗	s->c_phase = av_calloc(s->rdft_size, sizeof(*s->c_phase));
303		✗	s->mag_total = av_calloc(s->rdft_size, sizeof(*s->mag_total));
304		✗	s->lfe_mag = av_calloc(s->rdft_size, sizeof(*s->lfe_mag));
305		✗	s->lfe_phase = av_calloc(s->rdft_size, sizeof(*s->lfe_phase));
306		✗	if (!s->x_pos || !s->y_pos || !s->l_phase || !s->r_phase || !s->lfe_phase ||
307		✗	!s->c_phase || !s->mag_total || !s->lfe_mag || !s->c_mag)
308		✗	return AVERROR(ENOMEM);
309
310		✗	return 0;
311			}
312
313		✗	static float sqrf(float x)
314			{
315		✗	return x * x;
316			}
317
318		✗	static float r_distance(float a)
319			{
320		✗	return fminf(sqrtf(1.f + sqrf(tanf(a))), sqrtf(1.f + sqrf(1.f / tanf(a))));
321			}
322
323			#define MIN_MAG_SUM 0.00000001f
324
325		✗	static void angle_transform(float *x, float *y, float angle)
326			{
327			float reference, r, a;
328
329		✗	if (angle == 90.f)
330		✗	return;
331
332		✗	reference = angle * M_PIf / 180.f;
333		✗	r = hypotf(*x, *y);
334		✗	a = atan2f(*x, *y);
335
336		✗	r /= r_distance(a);
337
338		✗	if (fabsf(a) <= M_PI_4f)
339		✗	a *= reference / M_PI_2f;
340			else
341		✗	a = M_PIf + (-2.f * M_PIf + reference) * (M_PIf - fabsf(a)) * FFDIFFSIGN(a, 0.f) / (3.f * M_PI_2f);
342
343		✗	r *= r_distance(a);
344
345		✗	*x = av_clipf(sinf(a) * r, -1.f, 1.f);
346		✗	*y = av_clipf(cosf(a) * r, -1.f, 1.f);
347			}
348
349		✗	static void focus_transform(float *x, float *y, float focus)
350			{
351			float a, r, ra;
352
353		✗	if (focus == 0.f)
354		✗	return;
355
356		✗	a = atan2f(*x, *y);
357		✗	ra = r_distance(a);
358		✗	r = av_clipf(hypotf(*x, *y) / ra, 0.f, 1.f);
359		✗	r = focus > 0.f ? 1.f - powf(1.f - r, 1.f + focus * 20.f) : powf(r, 1.f - focus * 20.f);
360		✗	r *= ra;
361		✗	*x = av_clipf(sinf(a) * r, -1.f, 1.f);
362		✗	*y = av_clipf(cosf(a) * r, -1.f, 1.f);
363			}
364
365		✗	static void stereo_position(float a, float p, float *x, float *y)
366			{
367			av_assert2(a >= -1.f && a <= 1.f);
368			av_assert2(p >= 0.f && p <= M_PIf);
369		✗	*x = av_clipf(a+a*fmaxf(0.f, p*p-M_PI_2f), -1.f, 1.f);
370		✗	*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);
371		✗	}
372
373		✗	static inline void get_lfe(int output_lfe, int n, float lowcut, float highcut,
374			float *lfe_mag, float c_mag, float *mag_total, int lfe_mode)
375			{
376		✗	if (output_lfe && n < highcut) {
377		✗	*lfe_mag = n < lowcut ? 1.f : .5f*(1.f+cosf(M_PIf*(lowcut-n)/(lowcut-highcut)));
378		✗	*lfe_mag *= c_mag;
379		✗	if (lfe_mode)
380		✗	*mag_total -= *lfe_mag;
381			} else {
382		✗	*lfe_mag = 0.f;
383			}
384		✗	}
385
386			#define TRANSFORM \
387			dst[2 * n ] = mag * cosf(ph); \
388			dst[2 * n + 1] = mag * sinf(ph);
389
390		✗	static void calculate_factors(AVFilterContext *ctx, int ch, int chan)
391			{
392		✗	AudioSurroundContext *s = ctx->priv;
393		✗	float *factor = (float *)s->factors->extended_data[ch];
394		✗	const float f_x = s->f_x[sc_map[chan >= 0 ? chan : 0]];
395		✗	const float f_y = s->f_y[sc_map[chan >= 0 ? chan : 0]];
396		✗	const int rdft_size = s->rdft_size;
397		✗	const float *x = s->x_pos;
398		✗	const float *y = s->y_pos;
399
400		✗	switch (chan) {
401		✗	case AV_CHAN_FRONT_CENTER:
402		✗	for (int n = 0; n < rdft_size; n++)
403		✗	factor[n] = powf(1.f - fabsf(x[n]), f_x) * powf((y[n] + 1.f) * .5f, f_y);
404		✗	break;
405		✗	case AV_CHAN_FRONT_LEFT:
406		✗	for (int n = 0; n < rdft_size; n++)
407		✗	factor[n] = powf(.5f * ( x[n] + 1.f), f_x) * powf((y[n] + 1.f) * .5f, f_y);
408		✗	break;
409		✗	case AV_CHAN_FRONT_RIGHT:
410		✗	for (int n = 0; n < rdft_size; n++)
411		✗	factor[n] = powf(.5f * (-x[n] + 1.f), f_x) * powf((y[n] + 1.f) * .5f, f_y);
412		✗	break;
413		✗	case AV_CHAN_LOW_FREQUENCY:
414		✗	for (int n = 0; n < rdft_size; n++)
415		✗	factor[n] = powf(1.f - fabsf(x[n]), f_x) * powf((1.f - fabsf(y[n])), f_y);
416		✗	break;
417		✗	case AV_CHAN_BACK_CENTER:
418		✗	for (int n = 0; n < rdft_size; n++)
419		✗	factor[n] = powf(1.f - fabsf(x[n]), f_x) * powf((1.f - y[n]) * .5f, f_y);
420		✗	break;
421		✗	case AV_CHAN_BACK_LEFT:
422		✗	for (int n = 0; n < rdft_size; n++)
423		✗	factor[n] = powf(.5f * ( x[n] + 1.f), f_x) * powf(1.f - ((y[n] + 1.f) * .5f), f_y);
424		✗	break;
425		✗	case AV_CHAN_BACK_RIGHT:
426		✗	for (int n = 0; n < rdft_size; n++)
427		✗	factor[n] = powf(.5f * (-x[n] + 1.f), f_x) * powf(1.f - ((y[n] + 1.f) * .5f), f_y);
428		✗	break;
429		✗	case AV_CHAN_SIDE_LEFT:
430		✗	for (int n = 0; n < rdft_size; n++)
431		✗	factor[n] = powf(.5f * ( x[n] + 1.f), f_x) * powf(1.f - fabsf(y[n]), f_y);
432		✗	break;
433		✗	case AV_CHAN_SIDE_RIGHT:
434		✗	for (int n = 0; n < rdft_size; n++)
435		✗	factor[n] = powf(.5f * (-x[n] + 1.f), f_x) * powf(1.f - fabsf(y[n]), f_y);
436		✗	break;
437		✗	default:
438		✗	for (int n = 0; n < rdft_size; n++)
439		✗	factor[n] = 1.f;
440		✗	break;
441			}
442		✗	}
443
444		✗	static void do_transform(AVFilterContext *ctx, int ch)
445			{
446		✗	AudioSurroundContext *s = ctx->priv;
447		✗	float *sfactor = (float *)s->sfactors->extended_data[ch];
448		✗	float *factor = (float *)s->factors->extended_data[ch];
449		✗	float *omag = (float *)s->output_mag->extended_data[ch];
450		✗	float *oph = (float *)s->output_ph->extended_data[ch];
451		✗	float *dst = (float *)s->output->extended_data[ch];
452		✗	const int rdft_size = s->rdft_size;
453		✗	const float smooth = s->smooth;
454
455		✗	if (smooth > 0.f) {
456		✗	for (int n = 0; n < rdft_size; n++)
457		✗	sfactor[n] = smooth * factor[n] + (1.f - smooth) * sfactor[n];
458
459		✗	factor = sfactor;
460			}
461
462		✗	for (int n = 0; n < rdft_size; n++)
463		✗	omag[n] *= factor[n];
464
465		✗	for (int n = 0; n < rdft_size; n++) {
466		✗	const float mag = omag[n];
467		✗	const float ph = oph[n];
468
469		✗	TRANSFORM
470			}
471		✗	}
472
473		✗	static void stereo_copy(AVFilterContext *ctx, int ch, int chan)
474			{
475		✗	AudioSurroundContext *s = ctx->priv;
476		✗	float *omag = (float *)s->output_mag->extended_data[ch];
477		✗	float *oph = (float *)s->output_ph->extended_data[ch];
478		✗	const float *mag_total = s->mag_total;
479		✗	const int rdft_size = s->rdft_size;
480		✗	const float *c_phase = s->c_phase;
481		✗	const float *l_phase = s->l_phase;
482		✗	const float *r_phase = s->r_phase;
483		✗	const float *lfe_mag = s->lfe_mag;
484		✗	const float *c_mag = s->c_mag;
485
486		✗	switch (chan) {
487		✗	case AV_CHAN_FRONT_CENTER:
488		✗	memcpy(omag, c_mag, rdft_size * sizeof(*omag));
489		✗	break;
490		✗	case AV_CHAN_LOW_FREQUENCY:
491		✗	memcpy(omag, lfe_mag, rdft_size * sizeof(*omag));
492		✗	break;
493		✗	case AV_CHAN_FRONT_LEFT:
494			case AV_CHAN_FRONT_RIGHT:
495			case AV_CHAN_BACK_CENTER:
496			case AV_CHAN_BACK_LEFT:
497			case AV_CHAN_BACK_RIGHT:
498			case AV_CHAN_SIDE_LEFT:
499			case AV_CHAN_SIDE_RIGHT:
500		✗	memcpy(omag, mag_total, rdft_size * sizeof(*omag));
501		✗	break;
502		✗	default:
503		✗	break;
504			}
505
506		✗	switch (chan) {
507		✗	case AV_CHAN_FRONT_CENTER:
508			case AV_CHAN_LOW_FREQUENCY:
509			case AV_CHAN_BACK_CENTER:
510		✗	memcpy(oph, c_phase, rdft_size * sizeof(*oph));
511		✗	break;
512		✗	case AV_CHAN_FRONT_LEFT:
513			case AV_CHAN_BACK_LEFT:
514			case AV_CHAN_SIDE_LEFT:
515		✗	memcpy(oph, l_phase, rdft_size * sizeof(*oph));
516		✗	break;
517		✗	case AV_CHAN_FRONT_RIGHT:
518			case AV_CHAN_BACK_RIGHT:
519			case AV_CHAN_SIDE_RIGHT:
520		✗	memcpy(oph, r_phase, rdft_size * sizeof(*oph));
521		✗	break;
522		✗	default:
523		✗	break;
524			}
525		✗	}
526
527		✗	static void stereo_upmix(AVFilterContext *ctx, int ch)
528			{
529		✗	AudioSurroundContext *s = ctx->priv;
530		✗	const int chan = av_channel_layout_channel_from_index(&s->out_ch_layout, ch);
531
532		✗	calculate_factors(ctx, ch, chan);
533
534		✗	stereo_copy(ctx, ch, chan);
535
536		✗	do_transform(ctx, ch);
537		✗	}
538
539		✗	static void l2_1_upmix(AVFilterContext *ctx, int ch)
540			{
541		✗	AudioSurroundContext *s = ctx->priv;
542		✗	const int chan = av_channel_layout_channel_from_index(&s->out_ch_layout, ch);
543		✗	float *omag = (float *)s->output_mag->extended_data[ch];
544		✗	float *oph = (float *)s->output_ph->extended_data[ch];
545		✗	const float *mag_total = s->mag_total;
546		✗	const float *lfe_phase = s->lfe_phase;
547		✗	const int rdft_size = s->rdft_size;
548		✗	const float *c_phase = s->c_phase;
549		✗	const float *l_phase = s->l_phase;
550		✗	const float *r_phase = s->r_phase;
551		✗	const float *lfe_mag = s->lfe_mag;
552		✗	const float *c_mag = s->c_mag;
553
554		✗	switch (chan) {
555		✗	case AV_CHAN_LOW_FREQUENCY:
556		✗	calculate_factors(ctx, ch, -1);
557		✗	break;
558		✗	default:
559		✗	calculate_factors(ctx, ch, chan);
560		✗	break;
561			}
562
563		✗	switch (chan) {
564		✗	case AV_CHAN_FRONT_CENTER:
565		✗	memcpy(omag, c_mag, rdft_size * sizeof(*omag));
566		✗	break;
567		✗	case AV_CHAN_LOW_FREQUENCY:
568		✗	memcpy(omag, lfe_mag, rdft_size * sizeof(*omag));
569		✗	break;
570		✗	case AV_CHAN_FRONT_LEFT:
571			case AV_CHAN_FRONT_RIGHT:
572			case AV_CHAN_BACK_CENTER:
573			case AV_CHAN_BACK_LEFT:
574			case AV_CHAN_BACK_RIGHT:
575			case AV_CHAN_SIDE_LEFT:
576			case AV_CHAN_SIDE_RIGHT:
577		✗	memcpy(omag, mag_total, rdft_size * sizeof(*omag));
578		✗	break;
579		✗	default:
580		✗	break;
581			}
582
583		✗	switch (chan) {
584		✗	case AV_CHAN_LOW_FREQUENCY:
585		✗	memcpy(oph, lfe_phase, rdft_size * sizeof(*oph));
586		✗	break;
587		✗	case AV_CHAN_FRONT_CENTER:
588			case AV_CHAN_BACK_CENTER:
589		✗	memcpy(oph, c_phase, rdft_size * sizeof(*oph));
590		✗	break;
591		✗	case AV_CHAN_FRONT_LEFT:
592			case AV_CHAN_BACK_LEFT:
593			case AV_CHAN_SIDE_LEFT:
594		✗	memcpy(oph, l_phase, rdft_size * sizeof(*oph));
595		✗	break;
596		✗	case AV_CHAN_FRONT_RIGHT:
597			case AV_CHAN_BACK_RIGHT:
598			case AV_CHAN_SIDE_RIGHT:
599		✗	memcpy(oph, r_phase, rdft_size * sizeof(*oph));
600		✗	break;
601		✗	default:
602		✗	break;
603			}
604
605		✗	do_transform(ctx, ch);
606		✗	}
607
608		✗	static void surround_upmix(AVFilterContext *ctx, int ch)
609			{
610		✗	AudioSurroundContext *s = ctx->priv;
611		✗	const int chan = av_channel_layout_channel_from_index(&s->out_ch_layout, ch);
612
613		✗	switch (chan) {
614		✗	case AV_CHAN_FRONT_CENTER:
615		✗	calculate_factors(ctx, ch, -1);
616		✗	break;
617		✗	default:
618		✗	calculate_factors(ctx, ch, chan);
619		✗	break;
620			}
621
622		✗	stereo_copy(ctx, ch, chan);
623
624		✗	do_transform(ctx, ch);
625		✗	}
626
627		✗	static void upmix_7_1_5_0_side(AVFilterContext *ctx,
628			float c_re, float c_im,
629			float mag_totall, float mag_totalr,
630			float fl_phase, float fr_phase,
631			float bl_phase, float br_phase,
632			float sl_phase, float sr_phase,
633			float xl, float yl,
634			float xr, float yr,
635			int n)
636			{
637			float fl_mag, fr_mag, ls_mag, rs_mag, lb_mag, rb_mag;
638			float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb, *dstlfe;
639		✗	float lfe_mag, c_phase, mag_total = (mag_totall + mag_totalr) * 0.5f;
640		✗	AudioSurroundContext *s = ctx->priv;
641
642		✗	dstl = (float *)s->output->extended_data[0];
643		✗	dstr = (float *)s->output->extended_data[1];
644		✗	dstc = (float *)s->output->extended_data[2];
645		✗	dstlfe = (float *)s->output->extended_data[3];
646		✗	dstlb = (float *)s->output->extended_data[4];
647		✗	dstrb = (float *)s->output->extended_data[5];
648		✗	dstls = (float *)s->output->extended_data[6];
649		✗	dstrs = (float *)s->output->extended_data[7];
650
651		✗	c_phase = atan2f(c_im, c_re);
652
653		✗	get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, hypotf(c_re, c_im), &mag_total, s->lfe_mode);
654
655		✗	fl_mag = powf(.5f * (xl + 1.f), s->f_x[SC_FL]) * powf((yl + 1.f) * .5f, s->f_y[SC_FL]) * mag_totall;
656		✗	fr_mag = powf(.5f * (xr + 1.f), s->f_x[SC_FR]) * powf((yr + 1.f) * .5f, s->f_y[SC_FR]) * mag_totalr;
657		✗	lb_mag = powf(.5f * (-xl + 1.f), s->f_x[SC_BL]) * powf((yl + 1.f) * .5f, s->f_y[SC_BL]) * mag_totall;
658		✗	rb_mag = powf(.5f * (-xr + 1.f), s->f_x[SC_BR]) * powf((yr + 1.f) * .5f, s->f_y[SC_BR]) * mag_totalr;
659		✗	ls_mag = powf(1.f - fabsf(xl), s->f_x[SC_SL]) * powf((yl + 1.f) * .5f, s->f_y[SC_SL]) * mag_totall;
660		✗	rs_mag = powf(1.f - fabsf(xr), s->f_x[SC_SR]) * powf((yr + 1.f) * .5f, s->f_y[SC_SR]) * mag_totalr;
661
662		✗	dstl[2 * n ] = fl_mag * cosf(fl_phase);
663		✗	dstl[2 * n + 1] = fl_mag * sinf(fl_phase);
664
665		✗	dstr[2 * n ] = fr_mag * cosf(fr_phase);
666		✗	dstr[2 * n + 1] = fr_mag * sinf(fr_phase);
667
668		✗	dstc[2 * n ] = c_re;
669		✗	dstc[2 * n + 1] = c_im;
670
671		✗	dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
672		✗	dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
673
674		✗	dstlb[2 * n ] = lb_mag * cosf(bl_phase);
675		✗	dstlb[2 * n + 1] = lb_mag * sinf(bl_phase);
676
677		✗	dstrb[2 * n ] = rb_mag * cosf(br_phase);
678		✗	dstrb[2 * n + 1] = rb_mag * sinf(br_phase);
679
680		✗	dstls[2 * n ] = ls_mag * cosf(sl_phase);
681		✗	dstls[2 * n + 1] = ls_mag * sinf(sl_phase);
682
683		✗	dstrs[2 * n ] = rs_mag * cosf(sr_phase);
684		✗	dstrs[2 * n + 1] = rs_mag * sinf(sr_phase);
685		✗	}
686
687		✗	static void upmix_7_1_5_1(AVFilterContext *ctx,
688			float c_re, float c_im,
689			float lfe_re, float lfe_im,
690			float mag_totall, float mag_totalr,
691			float fl_phase, float fr_phase,
692			float bl_phase, float br_phase,
693			float sl_phase, float sr_phase,
694			float xl, float yl,
695			float xr, float yr,
696			int n)
697			{
698			float fl_mag, fr_mag, ls_mag, rs_mag, lb_mag, rb_mag;
699			float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb, *dstlfe;
700		✗	AudioSurroundContext *s = ctx->priv;
701
702		✗	dstl = (float *)s->output->extended_data[0];
703		✗	dstr = (float *)s->output->extended_data[1];
704		✗	dstc = (float *)s->output->extended_data[2];
705		✗	dstlfe = (float *)s->output->extended_data[3];
706		✗	dstlb = (float *)s->output->extended_data[4];
707		✗	dstrb = (float *)s->output->extended_data[5];
708		✗	dstls = (float *)s->output->extended_data[6];
709		✗	dstrs = (float *)s->output->extended_data[7];
710
711		✗	fl_mag = powf(.5f * (xl + 1.f), s->f_x[SC_FL]) * powf((yl + 1.f) * .5f, s->f_y[SC_FL]) * mag_totall;
712		✗	fr_mag = powf(.5f * (xr + 1.f), s->f_x[SC_FR]) * powf((yr + 1.f) * .5f, s->f_y[SC_FR]) * mag_totalr;
713		✗	lb_mag = powf(.5f * (-xl + 1.f), s->f_x[SC_BL]) * powf((yl + 1.f) * .5f, s->f_y[SC_BL]) * mag_totall;
714		✗	rb_mag = powf(.5f * (-xr + 1.f), s->f_x[SC_BR]) * powf((yr + 1.f) * .5f, s->f_y[SC_BR]) * mag_totalr;
715		✗	ls_mag = powf(1.f - fabsf(xl), s->f_x[SC_SL]) * powf((yl + 1.f) * .5f, s->f_y[SC_SL]) * mag_totall;
716		✗	rs_mag = powf(1.f - fabsf(xr), s->f_x[SC_SR]) * powf((yr + 1.f) * .5f, s->f_y[SC_SR]) * mag_totalr;
717
718		✗	dstl[2 * n ] = fl_mag * cosf(fl_phase);
719		✗	dstl[2 * n + 1] = fl_mag * sinf(fl_phase);
720
721		✗	dstr[2 * n ] = fr_mag * cosf(fr_phase);
722		✗	dstr[2 * n + 1] = fr_mag * sinf(fr_phase);
723
724		✗	dstc[2 * n ] = c_re;
725		✗	dstc[2 * n + 1] = c_im;
726
727		✗	dstlfe[2 * n ] = lfe_re;
728		✗	dstlfe[2 * n + 1] = lfe_im;
729
730		✗	dstlb[2 * n ] = lb_mag * cosf(bl_phase);
731		✗	dstlb[2 * n + 1] = lb_mag * sinf(bl_phase);
732
733		✗	dstrb[2 * n ] = rb_mag * cosf(br_phase);
734		✗	dstrb[2 * n + 1] = rb_mag * sinf(br_phase);
735
736		✗	dstls[2 * n ] = ls_mag * cosf(sl_phase);
737		✗	dstls[2 * n + 1] = ls_mag * sinf(sl_phase);
738
739		✗	dstrs[2 * n ] = rs_mag * cosf(sr_phase);
740		✗	dstrs[2 * n + 1] = rs_mag * sinf(sr_phase);
741		✗	}
742
743		✗	static void filter_stereo(AVFilterContext *ctx)
744			{
745		✗	AudioSurroundContext *s = ctx->priv;
746		✗	const float *srcl = (const float *)s->input->extended_data[0];
747		✗	const float *srcr = (const float *)s->input->extended_data[1];
748		✗	const int output_lfe = s->output_lfe && s->create_lfe;
749		✗	const int rdft_size = s->rdft_size;
750		✗	const int lfe_mode = s->lfe_mode;
751		✗	const float highcut = s->highcut;
752		✗	const float lowcut = s->lowcut;
753		✗	const float angle = s->angle;
754		✗	const float focus = s->focus;
755		✗	float *magtotal = s->mag_total;
756		✗	float *lfemag = s->lfe_mag;
757		✗	float *lphase = s->l_phase;
758		✗	float *rphase = s->r_phase;
759		✗	float *cphase = s->c_phase;
760		✗	float *cmag = s->c_mag;
761		✗	float *xpos = s->x_pos;
762		✗	float *ypos = s->y_pos;
763
764		✗	for (int n = 0; n < rdft_size; n++) {
765		✗	float l_re = srcl[2 * n], r_re = srcr[2 * n];
766		✗	float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
767		✗	float c_phase = atan2f(l_im + r_im, l_re + r_re);
768		✗	float l_mag = hypotf(l_re, l_im);
769		✗	float r_mag = hypotf(r_re, r_im);
770		✗	float mag_total = hypotf(l_mag, r_mag);
771		✗	float l_phase = atan2f(l_im, l_re);
772		✗	float r_phase = atan2f(r_im, r_re);
773		✗	float phase_dif = fabsf(l_phase - r_phase);
774		✗	float mag_sum = l_mag + r_mag;
775		✗	float c_mag = mag_sum * 0.5f;
776			float mag_dif, x, y;
777
778		✗	mag_sum = mag_sum < MIN_MAG_SUM ? 1.f : mag_sum;
779		✗	mag_dif = (l_mag - r_mag) / mag_sum;
780		✗	if (phase_dif > M_PIf)
781		✗	phase_dif = 2.f * M_PIf - phase_dif;
782
783		✗	stereo_position(mag_dif, phase_dif, &x, &y);
784		✗	angle_transform(&x, &y, angle);
785		✗	focus_transform(&x, &y, focus);
786		✗	get_lfe(output_lfe, n, lowcut, highcut, &lfemag[n], c_mag, &mag_total, lfe_mode);
787
788		✗	xpos[n] = x;
789		✗	ypos[n] = y;
790		✗	lphase[n] = l_phase;
791		✗	rphase[n] = r_phase;
792		✗	cmag[n] = c_mag;
793		✗	cphase[n] = c_phase;
794		✗	magtotal[n] = mag_total;
795			}
796		✗	}
797
798		✗	static void filter_2_1(AVFilterContext *ctx)
799			{
800		✗	AudioSurroundContext *s = ctx->priv;
801		✗	const float *srcl = (const float *)s->input->extended_data[0];
802		✗	const float *srcr = (const float *)s->input->extended_data[1];
803		✗	const float *srclfe = (const float *)s->input->extended_data[2];
804		✗	const int rdft_size = s->rdft_size;
805		✗	const float angle = s->angle;
806		✗	const float focus = s->focus;
807		✗	float *magtotal = s->mag_total;
808		✗	float *lfephase = s->lfe_phase;
809		✗	float *lfemag = s->lfe_mag;
810		✗	float *lphase = s->l_phase;
811		✗	float *rphase = s->r_phase;
812		✗	float *cphase = s->c_phase;
813		✗	float *cmag = s->c_mag;
814		✗	float *xpos = s->x_pos;
815		✗	float *ypos = s->y_pos;
816
817		✗	for (int n = 0; n < rdft_size; n++) {
818		✗	float l_re = srcl[2 * n], r_re = srcr[2 * n];
819		✗	float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
820		✗	float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
821		✗	float c_phase = atan2f(l_im + r_im, l_re + r_re);
822		✗	float l_mag = hypotf(l_re, l_im);
823		✗	float r_mag = hypotf(r_re, r_im);
824		✗	float lfe_mag = hypotf(lfe_re, lfe_im);
825		✗	float lfe_phase = atan2f(lfe_im, lfe_re);
826		✗	float mag_total = hypotf(l_mag, r_mag);
827		✗	float l_phase = atan2f(l_im, l_re);
828		✗	float r_phase = atan2f(r_im, r_re);
829		✗	float phase_dif = fabsf(l_phase - r_phase);
830		✗	float mag_sum = l_mag + r_mag;
831		✗	float c_mag = mag_sum * 0.5f;
832			float mag_dif, x, y;
833
834		✗	mag_sum = mag_sum < MIN_MAG_SUM ? 1.f : mag_sum;
835		✗	mag_dif = (l_mag - r_mag) / mag_sum;
836		✗	if (phase_dif > M_PIf)
837		✗	phase_dif = 2.f * M_PIf - phase_dif;
838
839		✗	stereo_position(mag_dif, phase_dif, &x, &y);
840		✗	angle_transform(&x, &y, angle);
841		✗	focus_transform(&x, &y, focus);
842
843		✗	xpos[n] = x;
844		✗	ypos[n] = y;
845		✗	lphase[n] = l_phase;
846		✗	rphase[n] = r_phase;
847		✗	cmag[n] = c_mag;
848		✗	cphase[n] = c_phase;
849		✗	lfemag[n] = lfe_mag;
850		✗	lfephase[n] = lfe_phase;
851		✗	magtotal[n] = mag_total;
852			}
853		✗	}
854
855		✗	static void filter_surround(AVFilterContext *ctx)
856			{
857		✗	AudioSurroundContext *s = ctx->priv;
858		✗	const float *srcl = (const float *)s->input->extended_data[0];
859		✗	const float *srcr = (const float *)s->input->extended_data[1];
860		✗	const float *srcc = (const float *)s->input->extended_data[2];
861		✗	const int output_lfe = s->output_lfe && s->create_lfe;
862		✗	const int rdft_size = s->rdft_size;
863		✗	const int lfe_mode = s->lfe_mode;
864		✗	const float highcut = s->highcut;
865		✗	const float lowcut = s->lowcut;
866		✗	const float angle = s->angle;
867		✗	const float focus = s->focus;
868		✗	float *magtotal = s->mag_total;
869		✗	float *lfemag = s->lfe_mag;
870		✗	float *lphase = s->l_phase;
871		✗	float *rphase = s->r_phase;
872		✗	float *cphase = s->c_phase;
873		✗	float *cmag = s->c_mag;
874		✗	float *xpos = s->x_pos;
875		✗	float *ypos = s->y_pos;
876
877		✗	for (int n = 0; n < rdft_size; n++) {
878		✗	float l_re = srcl[2 * n], r_re = srcr[2 * n];
879		✗	float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
880		✗	float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
881		✗	float c_phase = atan2f(c_im, c_re);
882		✗	float c_mag = hypotf(c_re, c_im);
883		✗	float l_mag = hypotf(l_re, l_im);
884		✗	float r_mag = hypotf(r_re, r_im);
885		✗	float mag_total = hypotf(l_mag, r_mag);
886		✗	float l_phase = atan2f(l_im, l_re);
887		✗	float r_phase = atan2f(r_im, r_re);
888		✗	float phase_dif = fabsf(l_phase - r_phase);
889		✗	float mag_sum = l_mag + r_mag;
890			float mag_dif, x, y;
891
892		✗	mag_sum = mag_sum < MIN_MAG_SUM ? 1.f : mag_sum;
893		✗	mag_dif = (l_mag - r_mag) / mag_sum;
894		✗	if (phase_dif > M_PIf)
895		✗	phase_dif = 2.f * M_PIf - phase_dif;
896
897		✗	stereo_position(mag_dif, phase_dif, &x, &y);
898		✗	angle_transform(&x, &y, angle);
899		✗	focus_transform(&x, &y, focus);
900		✗	get_lfe(output_lfe, n, lowcut, highcut, &lfemag[n], c_mag, &mag_total, lfe_mode);
901
902		✗	xpos[n] = x;
903		✗	ypos[n] = y;
904		✗	lphase[n] = l_phase;
905		✗	rphase[n] = r_phase;
906		✗	cmag[n] = c_mag;
907		✗	cphase[n] = c_phase;
908		✗	magtotal[n] = mag_total;
909			}
910		✗	}
911
912		✗	static void filter_5_0_side(AVFilterContext *ctx)
913			{
914		✗	AudioSurroundContext *s = ctx->priv;
915		✗	const int rdft_size = s->rdft_size;
916			float *srcl, *srcr, *srcc, *srcsl, *srcsr;
917			int n;
918
919		✗	srcl = (float *)s->input->extended_data[0];
920		✗	srcr = (float *)s->input->extended_data[1];
921		✗	srcc = (float *)s->input->extended_data[2];
922		✗	srcsl = (float *)s->input->extended_data[3];
923		✗	srcsr = (float *)s->input->extended_data[4];
924
925		✗	for (n = 0; n < rdft_size; n++) {
926		✗	float fl_re = srcl[2 * n], fr_re = srcr[2 * n];
927		✗	float fl_im = srcl[2 * n + 1], fr_im = srcr[2 * n + 1];
928		✗	float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
929		✗	float sl_re = srcsl[2 * n], sl_im = srcsl[2 * n + 1];
930		✗	float sr_re = srcsr[2 * n], sr_im = srcsr[2 * n + 1];
931		✗	float fl_mag = hypotf(fl_re, fl_im);
932		✗	float fr_mag = hypotf(fr_re, fr_im);
933		✗	float fl_phase = atan2f(fl_im, fl_re);
934		✗	float fr_phase = atan2f(fr_im, fr_re);
935		✗	float sl_mag = hypotf(sl_re, sl_im);
936		✗	float sr_mag = hypotf(sr_re, sr_im);
937		✗	float sl_phase = atan2f(sl_im, sl_re);
938		✗	float sr_phase = atan2f(sr_im, sr_re);
939		✗	float phase_difl = fabsf(fl_phase - sl_phase);
940		✗	float phase_difr = fabsf(fr_phase - sr_phase);
941		✗	float magl_sum = fl_mag + sl_mag;
942		✗	float magr_sum = fr_mag + sr_mag;
943		✗	float mag_difl = magl_sum < MIN_MAG_SUM ? FFDIFFSIGN(fl_mag, sl_mag) : (fl_mag - sl_mag) / magl_sum;
944		✗	float mag_difr = magr_sum < MIN_MAG_SUM ? FFDIFFSIGN(fr_mag, sr_mag) : (fr_mag - sr_mag) / magr_sum;
945		✗	float mag_totall = hypotf(fl_mag, sl_mag);
946		✗	float mag_totalr = hypotf(fr_mag, sr_mag);
947		✗	float bl_phase = atan2f(fl_im + sl_im, fl_re + sl_re);
948		✗	float br_phase = atan2f(fr_im + sr_im, fr_re + sr_re);
949			float xl, yl;
950			float xr, yr;
951
952		✗	if (phase_difl > M_PIf)
953		✗	phase_difl = 2.f * M_PIf - phase_difl;
954
955		✗	if (phase_difr > M_PIf)
956		✗	phase_difr = 2.f * M_PIf - phase_difr;
957
958		✗	stereo_position(mag_difl, phase_difl, &xl, &yl);
959		✗	stereo_position(mag_difr, phase_difr, &xr, &yr);
960
961		✗	s->upmix_5_0(ctx, c_re, c_im,
962			mag_totall, mag_totalr,
963			fl_phase, fr_phase,
964			bl_phase, br_phase,
965			sl_phase, sr_phase,
966			xl, yl, xr, yr, n);
967			}
968		✗	}
969
970		✗	static void filter_5_1_side(AVFilterContext *ctx)
971			{
972		✗	AudioSurroundContext *s = ctx->priv;
973		✗	const int rdft_size = s->rdft_size;
974			float *srcl, *srcr, *srcc, *srclfe, *srcsl, *srcsr;
975			int n;
976
977		✗	srcl = (float *)s->input->extended_data[0];
978		✗	srcr = (float *)s->input->extended_data[1];
979		✗	srcc = (float *)s->input->extended_data[2];
980		✗	srclfe = (float *)s->input->extended_data[3];
981		✗	srcsl = (float *)s->input->extended_data[4];
982		✗	srcsr = (float *)s->input->extended_data[5];
983
984		✗	for (n = 0; n < rdft_size; n++) {
985		✗	float fl_re = srcl[2 * n], fr_re = srcr[2 * n];
986		✗	float fl_im = srcl[2 * n + 1], fr_im = srcr[2 * n + 1];
987		✗	float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
988		✗	float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
989		✗	float sl_re = srcsl[2 * n], sl_im = srcsl[2 * n + 1];
990		✗	float sr_re = srcsr[2 * n], sr_im = srcsr[2 * n + 1];
991		✗	float fl_mag = hypotf(fl_re, fl_im);
992		✗	float fr_mag = hypotf(fr_re, fr_im);
993		✗	float fl_phase = atan2f(fl_im, fl_re);
994		✗	float fr_phase = atan2f(fr_im, fr_re);
995		✗	float sl_mag = hypotf(sl_re, sl_im);
996		✗	float sr_mag = hypotf(sr_re, sr_im);
997		✗	float sl_phase = atan2f(sl_im, sl_re);
998		✗	float sr_phase = atan2f(sr_im, sr_re);
999		✗	float phase_difl = fabsf(fl_phase - sl_phase);
1000		✗	float phase_difr = fabsf(fr_phase - sr_phase);
1001		✗	float magl_sum = fl_mag + sl_mag;
1002		✗	float magr_sum = fr_mag + sr_mag;
1003		✗	float mag_difl = magl_sum < MIN_MAG_SUM ? FFDIFFSIGN(fl_mag, sl_mag) : (fl_mag - sl_mag) / magl_sum;
1004		✗	float mag_difr = magr_sum < MIN_MAG_SUM ? FFDIFFSIGN(fr_mag, sr_mag) : (fr_mag - sr_mag) / magr_sum;
1005		✗	float mag_totall = hypotf(fl_mag, sl_mag);
1006		✗	float mag_totalr = hypotf(fr_mag, sr_mag);
1007		✗	float bl_phase = atan2f(fl_im + sl_im, fl_re + sl_re);
1008		✗	float br_phase = atan2f(fr_im + sr_im, fr_re + sr_re);
1009			float xl, yl;
1010			float xr, yr;
1011
1012		✗	if (phase_difl > M_PIf)
1013		✗	phase_difl = 2.f * M_PIf - phase_difl;
1014
1015		✗	if (phase_difr > M_PIf)
1016		✗	phase_difr = 2.f * M_PIf - phase_difr;
1017
1018		✗	stereo_position(mag_difl, phase_difl, &xl, &yl);
1019		✗	stereo_position(mag_difr, phase_difr, &xr, &yr);
1020
1021		✗	s->upmix_5_1(ctx, c_re, c_im, lfe_re, lfe_im,
1022			mag_totall, mag_totalr,
1023			fl_phase, fr_phase,
1024			bl_phase, br_phase,
1025			sl_phase, sr_phase,
1026			xl, yl, xr, yr, n);
1027			}
1028		✗	}
1029
1030		✗	static void filter_5_1_back(AVFilterContext *ctx)
1031			{
1032		✗	AudioSurroundContext *s = ctx->priv;
1033		✗	const int rdft_size = s->rdft_size;
1034			float *srcl, *srcr, *srcc, *srclfe, *srcbl, *srcbr;
1035			int n;
1036
1037		✗	srcl = (float *)s->input->extended_data[0];
1038		✗	srcr = (float *)s->input->extended_data[1];
1039		✗	srcc = (float *)s->input->extended_data[2];
1040		✗	srclfe = (float *)s->input->extended_data[3];
1041		✗	srcbl = (float *)s->input->extended_data[4];
1042		✗	srcbr = (float *)s->input->extended_data[5];
1043
1044		✗	for (n = 0; n < rdft_size; n++) {
1045		✗	float fl_re = srcl[2 * n], fr_re = srcr[2 * n];
1046		✗	float fl_im = srcl[2 * n + 1], fr_im = srcr[2 * n + 1];
1047		✗	float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
1048		✗	float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
1049		✗	float bl_re = srcbl[2 * n], bl_im = srcbl[2 * n + 1];
1050		✗	float br_re = srcbr[2 * n], br_im = srcbr[2 * n + 1];
1051		✗	float fl_mag = hypotf(fl_re, fl_im);
1052		✗	float fr_mag = hypotf(fr_re, fr_im);
1053		✗	float fl_phase = atan2f(fl_im, fl_re);
1054		✗	float fr_phase = atan2f(fr_im, fr_re);
1055		✗	float bl_mag = hypotf(bl_re, bl_im);
1056		✗	float br_mag = hypotf(br_re, br_im);
1057		✗	float bl_phase = atan2f(bl_im, bl_re);
1058		✗	float br_phase = atan2f(br_im, br_re);
1059		✗	float phase_difl = fabsf(fl_phase - bl_phase);
1060		✗	float phase_difr = fabsf(fr_phase - br_phase);
1061		✗	float magl_sum = fl_mag + bl_mag;
1062		✗	float magr_sum = fr_mag + br_mag;
1063		✗	float mag_difl = magl_sum < MIN_MAG_SUM ? FFDIFFSIGN(fl_mag, bl_mag) : (fl_mag - bl_mag) / magl_sum;
1064		✗	float mag_difr = magr_sum < MIN_MAG_SUM ? FFDIFFSIGN(fr_mag, br_mag) : (fr_mag - br_mag) / magr_sum;
1065		✗	float mag_totall = hypotf(fl_mag, bl_mag);
1066		✗	float mag_totalr = hypotf(fr_mag, br_mag);
1067		✗	float sl_phase = atan2f(fl_im + bl_im, fl_re + bl_re);
1068		✗	float sr_phase = atan2f(fr_im + br_im, fr_re + br_re);
1069			float xl, yl;
1070			float xr, yr;
1071
1072		✗	if (phase_difl > M_PIf)
1073		✗	phase_difl = 2.f * M_PIf - phase_difl;
1074
1075		✗	if (phase_difr > M_PIf)
1076		✗	phase_difr = 2.f * M_PIf - phase_difr;
1077
1078		✗	stereo_position(mag_difl, phase_difl, &xl, &yl);
1079		✗	stereo_position(mag_difr, phase_difr, &xr, &yr);
1080
1081		✗	s->upmix_5_1(ctx, c_re, c_im, lfe_re, lfe_im,
1082			mag_totall, mag_totalr,
1083			fl_phase, fr_phase,
1084			bl_phase, br_phase,
1085			sl_phase, sr_phase,
1086			xl, yl, xr, yr, n);
1087			}
1088		✗	}
1089
1090		✗	static void allchannels_spread(AVFilterContext *ctx)
1091			{
1092		✗	AudioSurroundContext *s = ctx->priv;
1093
1094		✗	if (s->all_x >= 0.f)
1095		✗	for (int n = 0; n < SC_NB; n++)
1096		✗	s->f_x[n] = s->all_x;
1097		✗	s->all_x = -1.f;
1098		✗	if (s->all_y >= 0.f)
1099		✗	for (int n = 0; n < SC_NB; n++)
1100		✗	s->f_y[n] = s->all_y;
1101		✗	s->all_y = -1.f;
1102		✗	}
1103
1104		✗	static av_cold int init(AVFilterContext *ctx)
1105			{
1106		✗	AudioSurroundContext *s = ctx->priv;
1107			int64_t in_channel_layout, out_channel_layout;
1108			char in_name[128], out_name[128];
1109			float overlap;
1110
1111		✗	if (s->lowcutf >= s->highcutf) {
1112		✗	av_log(ctx, AV_LOG_ERROR, "Low cut-off '%d' should be less than high cut-off '%d'.\n",
1113			s->lowcutf, s->highcutf);
1114		✗	return AVERROR(EINVAL);
1115			}
1116
1117		✗	in_channel_layout = s->in_ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?
1118		✗	s->in_ch_layout.u.mask : 0;
1119		✗	out_channel_layout = s->out_ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?
1120		✗	s->out_ch_layout.u.mask : 0;
1121
1122		✗	s->create_lfe = av_channel_layout_index_from_channel(&s->out_ch_layout,
1123		✗	AV_CHAN_LOW_FREQUENCY) >= 0;
1124
1125		✗	switch (out_channel_layout) {
1126		✗	case AV_CH_LAYOUT_MONO:
1127			case AV_CH_LAYOUT_STEREO:
1128			case AV_CH_LAYOUT_2POINT1:
1129			case AV_CH_LAYOUT_2_1:
1130			case AV_CH_LAYOUT_2_2:
1131			case AV_CH_LAYOUT_SURROUND:
1132			case AV_CH_LAYOUT_3POINT1:
1133			case AV_CH_LAYOUT_QUAD:
1134			case AV_CH_LAYOUT_4POINT0:
1135			case AV_CH_LAYOUT_4POINT1:
1136			case AV_CH_LAYOUT_5POINT0:
1137			case AV_CH_LAYOUT_5POINT1:
1138			case AV_CH_LAYOUT_5POINT0_BACK:
1139			case AV_CH_LAYOUT_5POINT1_BACK:
1140			case AV_CH_LAYOUT_6POINT0:
1141			case AV_CH_LAYOUT_6POINT1:
1142			case AV_CH_LAYOUT_7POINT0:
1143			case AV_CH_LAYOUT_7POINT1:
1144			case AV_CH_LAYOUT_OCTAGONAL:
1145		✗	break;
1146		✗	default:
1147		✗	goto fail;
1148			}
1149
1150		✗	switch (in_channel_layout) {
1151		✗	case AV_CH_LAYOUT_STEREO:
1152		✗	s->filter = filter_stereo;
1153		✗	s->upmix = stereo_upmix;
1154		✗	break;
1155		✗	case AV_CH_LAYOUT_2POINT1:
1156		✗	s->filter = filter_2_1;
1157		✗	s->upmix = l2_1_upmix;
1158		✗	break;
1159		✗	case AV_CH_LAYOUT_SURROUND:
1160		✗	s->filter = filter_surround;
1161		✗	s->upmix = surround_upmix;
1162		✗	break;
1163		✗	case AV_CH_LAYOUT_5POINT0:
1164		✗	s->filter = filter_5_0_side;
1165			switch (out_channel_layout) {
1166		✗	case AV_CH_LAYOUT_7POINT1:
1167		✗	s->upmix_5_0 = upmix_7_1_5_0_side;
1168		✗	break;
1169		✗	default:
1170		✗	goto fail;
1171			}
1172		✗	break;
1173		✗	case AV_CH_LAYOUT_5POINT1:
1174		✗	s->filter = filter_5_1_side;
1175			switch (out_channel_layout) {
1176		✗	case AV_CH_LAYOUT_7POINT1:
1177		✗	s->upmix_5_1 = upmix_7_1_5_1;
1178		✗	break;
1179		✗	default:
1180		✗	goto fail;
1181			}
1182		✗	break;
1183		✗	case AV_CH_LAYOUT_5POINT1_BACK:
1184		✗	s->filter = filter_5_1_back;
1185			switch (out_channel_layout) {
1186		✗	case AV_CH_LAYOUT_7POINT1:
1187		✗	s->upmix_5_1 = upmix_7_1_5_1;
1188		✗	break;
1189		✗	default:
1190		✗	goto fail;
1191			}
1192		✗	break;
1193			default:
1194		✗	fail:
1195		✗	av_channel_layout_describe(&s->out_ch_layout, out_name, sizeof(out_name));
1196		✗	av_channel_layout_describe(&s->in_ch_layout, in_name, sizeof(in_name));
1197		✗	av_log(ctx, AV_LOG_ERROR, "Unsupported upmix: '%s' -> '%s'.\n",
1198			in_name, out_name);
1199		✗	return AVERROR(EINVAL);
1200			}
1201
1202		✗	s->window_func_lut = av_calloc(s->win_size, sizeof(*s->window_func_lut));
1203		✗	if (!s->window_func_lut)
1204		✗	return AVERROR(ENOMEM);
1205
1206		✗	generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap);
1207		✗	if (s->overlap == 1)
1208		✗	s->overlap = overlap;
1209
1210		✗	for (int i = 0; i < s->win_size; i++)
1211		✗	s->window_func_lut[i] = sqrtf(s->window_func_lut[i] / s->win_size);
1212		✗	s->hop_size = FFMAX(1, s->win_size * (1. - s->overlap));
1213
1214			{
1215		✗	float max = 0.f, *temp_lut = av_calloc(s->win_size, sizeof(*temp_lut));
1216		✗	if (!temp_lut)
1217		✗	return AVERROR(ENOMEM);
1218
1219		✗	for (int j = 0; j < s->win_size; j += s->hop_size) {
1220		✗	for (int i = 0; i < s->win_size; i++)
1221		✗	temp_lut[(i + j) % s->win_size] += s->window_func_lut[i];
1222			}
1223
1224		✗	for (int i = 0; i < s->win_size; i++)
1225		✗	max = fmaxf(temp_lut[i], max);
1226		✗	av_freep(&temp_lut);
1227
1228		✗	s->win_gain = 1.f / (max * sqrtf(s->win_size));
1229			}
1230
1231		✗	allchannels_spread(ctx);
1232
1233		✗	return 0;
1234			}
1235
1236		✗	static int fft_channel(AVFilterContext *ctx, AVFrame *in, int ch)
1237			{
1238		✗	AudioSurroundContext *s = ctx->priv;
1239		✗	float *src = (float *)s->input_in->extended_data[ch];
1240		✗	float *win = (float *)s->window->extended_data[ch];
1241		✗	const float *window_func_lut = s->window_func_lut;
1242		✗	const int offset = s->win_size - s->hop_size;
1243		✗	const float level_in = s->input_levels[ch];
1244		✗	const int win_size = s->win_size;
1245
1246		✗	memmove(src, &src[s->hop_size], offset * sizeof(float));
1247		✗	memcpy(&src[offset], in->extended_data[ch], in->nb_samples * sizeof(float));
1248		✗	memset(&src[offset + in->nb_samples], 0, (s->hop_size - in->nb_samples) * sizeof(float));
1249
1250		✗	for (int n = 0; n < win_size; n++)
1251		✗	win[n] = src[n] * window_func_lut[n] * level_in;
1252
1253		✗	s->tx_fn(s->rdft[ch], (float *)s->input->extended_data[ch], win, sizeof(float));
1254
1255		✗	return 0;
1256			}
1257
1258		✗	static int fft_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
1259			{
1260		✗	AVFrame *in = arg;
1261		✗	const int start = (in->ch_layout.nb_channels * jobnr) / nb_jobs;
1262		✗	const int end = (in->ch_layout.nb_channels * (jobnr+1)) / nb_jobs;
1263
1264		✗	for (int ch = start; ch < end; ch++)
1265		✗	fft_channel(ctx, in, ch);
1266
1267		✗	return 0;
1268			}
1269
1270		✗	static int ifft_channel(AVFilterContext *ctx, AVFrame *out, int ch)
1271			{
1272		✗	AudioSurroundContext *s = ctx->priv;
1273		✗	const float level_out = s->output_levels[ch] * s->win_gain;
1274		✗	const float *window_func_lut = s->window_func_lut;
1275		✗	const int win_size = s->win_size;
1276			float *dst, *ptr;
1277
1278		✗	dst = (float *)s->output_out->extended_data[ch];
1279		✗	ptr = (float *)s->overlap_buffer->extended_data[ch];
1280		✗	s->itx_fn(s->irdft[ch], dst, (float *)s->output->extended_data[ch], sizeof(AVComplexFloat));
1281
1282		✗	memmove(s->overlap_buffer->extended_data[ch],
1283		✗	s->overlap_buffer->extended_data[ch] + s->hop_size * sizeof(float),
1284		✗	s->win_size * sizeof(float));
1285		✗	memset(s->overlap_buffer->extended_data[ch] + s->win_size * sizeof(float),
1286		✗	0, s->hop_size * sizeof(float));
1287
1288		✗	for (int n = 0; n < win_size; n++)
1289		✗	ptr[n] += dst[n] * window_func_lut[n] * level_out;
1290
1291		✗	ptr = (float *)s->overlap_buffer->extended_data[ch];
1292		✗	dst = (float *)out->extended_data[ch];
1293		✗	memcpy(dst, ptr, s->hop_size * sizeof(float));
1294
1295		✗	return 0;
1296			}
1297
1298		✗	static int ifft_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
1299			{
1300		✗	AudioSurroundContext *s = ctx->priv;
1301		✗	AVFrame *out = arg;
1302		✗	const int start = (out->ch_layout.nb_channels * jobnr) / nb_jobs;
1303		✗	const int end = (out->ch_layout.nb_channels * (jobnr+1)) / nb_jobs;
1304
1305		✗	for (int ch = start; ch < end; ch++) {
1306		✗	if (s->upmix)
1307		✗	s->upmix(ctx, ch);
1308		✗	ifft_channel(ctx, out, ch);
1309			}
1310
1311		✗	return 0;
1312			}
1313
1314		✗	static int filter_frame(AVFilterLink *inlink, AVFrame *in)
1315			{
1316		✗	AVFilterContext *ctx = inlink->dst;
1317		✗	AVFilterLink *outlink = ctx->outputs[0];
1318		✗	AudioSurroundContext *s = ctx->priv;
1319			AVFrame *out;
1320
1321		✗	ff_filter_execute(ctx, fft_channels, in, NULL,
1322		✗	FFMIN(inlink->ch_layout.nb_channels,
1323			ff_filter_get_nb_threads(ctx)));
1324
1325		✗	s->filter(ctx);
1326
1327		✗	out = ff_get_audio_buffer(outlink, s->hop_size);
1328		✗	if (!out)
1329		✗	return AVERROR(ENOMEM);
1330
1331		✗	ff_filter_execute(ctx, ifft_channels, out, NULL,
1332		✗	FFMIN(outlink->ch_layout.nb_channels,
1333			ff_filter_get_nb_threads(ctx)));
1334
1335		✗	av_frame_copy_props(out, in);
1336		✗	out->nb_samples = in->nb_samples;
1337
1338		✗	av_frame_free(&in);
1339		✗	return ff_filter_frame(outlink, out);
1340			}
1341
1342		✗	static int activate(AVFilterContext *ctx)
1343			{
1344		✗	AVFilterLink *inlink = ctx->inputs[0];
1345		✗	AVFilterLink *outlink = ctx->outputs[0];
1346		✗	AudioSurroundContext *s = ctx->priv;
1347		✗	AVFrame *in = NULL;
1348		✗	int ret = 0, status;
1349			int64_t pts;
1350
1351		✗	FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
1352
1353		✗	ret = ff_inlink_consume_samples(inlink, s->hop_size, s->hop_size, &in);
1354		✗	if (ret < 0)
1355		✗	return ret;
1356
1357		✗	if (ret > 0)
1358		✗	ret = filter_frame(inlink, in);
1359		✗	if (ret < 0)
1360		✗	return ret;
1361
1362		✗	if (ff_inlink_queued_samples(inlink) >= s->hop_size) {
1363		✗	ff_filter_set_ready(ctx, 10);
1364		✗	return 0;
1365			}
1366
1367		✗	if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
1368		✗	ff_outlink_set_status(outlink, status, pts);
1369		✗	return 0;
1370			}
1371
1372		✗	FF_FILTER_FORWARD_WANTED(outlink, inlink);
1373
1374		✗	return FFERROR_NOT_READY;
1375			}
1376
1377		✗	static av_cold void uninit(AVFilterContext *ctx)
1378			{
1379		✗	AudioSurroundContext *s = ctx->priv;
1380
1381		✗	av_frame_free(&s->factors);
1382		✗	av_frame_free(&s->sfactors);
1383		✗	av_frame_free(&s->window);
1384		✗	av_frame_free(&s->input_in);
1385		✗	av_frame_free(&s->input);
1386		✗	av_frame_free(&s->output);
1387		✗	av_frame_free(&s->output_ph);
1388		✗	av_frame_free(&s->output_mag);
1389		✗	av_frame_free(&s->output_out);
1390		✗	av_frame_free(&s->overlap_buffer);
1391
1392		✗	for (int ch = 0; ch < s->nb_in_channels; ch++)
1393		✗	av_tx_uninit(&s->rdft[ch]);
1394		✗	for (int ch = 0; ch < s->nb_out_channels; ch++)
1395		✗	av_tx_uninit(&s->irdft[ch]);
1396		✗	av_freep(&s->input_levels);
1397		✗	av_freep(&s->output_levels);
1398		✗	av_freep(&s->rdft);
1399		✗	av_freep(&s->irdft);
1400		✗	av_freep(&s->window_func_lut);
1401
1402		✗	av_freep(&s->x_pos);
1403		✗	av_freep(&s->y_pos);
1404		✗	av_freep(&s->l_phase);
1405		✗	av_freep(&s->r_phase);
1406		✗	av_freep(&s->c_mag);
1407		✗	av_freep(&s->c_phase);
1408		✗	av_freep(&s->mag_total);
1409		✗	av_freep(&s->lfe_mag);
1410		✗	av_freep(&s->lfe_phase);
1411		✗	}
1412
1413		✗	static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
1414			char *res, int res_len, int flags)
1415			{
1416		✗	AudioSurroundContext *s = ctx->priv;
1417			int ret;
1418
1419		✗	ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
1420		✗	if (ret < 0)
1421		✗	return ret;
1422
1423		✗	s->hop_size = FFMAX(1, s->win_size * (1. - s->overlap));
1424
1425		✗	allchannels_spread(ctx);
1426		✗	set_input_levels(ctx);
1427		✗	set_output_levels(ctx);
1428
1429		✗	return 0;
1430			}
1431
1432			#define OFFSET(x) offsetof(AudioSurroundContext, x)
1433			#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
1434			#define TFLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
1435
1436			static const AVOption surround_options[] = {
1437			{ "chl_out", "set output channel layout", OFFSET(out_ch_layout), AV_OPT_TYPE_CHLAYOUT, {.str="5.1"}, 0, 0, FLAGS },
1438			{ "chl_in", "set input channel layout", OFFSET(in_ch_layout), AV_OPT_TYPE_CHLAYOUT, {.str="stereo"},0, 0, FLAGS },
1439			{ "level_in", "set input level", OFFSET(level_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1440			{ "level_out", "set output level", OFFSET(level_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1441			{ "lfe", "output LFE", OFFSET(output_lfe), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, TFLAGS },
1442			{ "lfe_low", "LFE low cut off", OFFSET(lowcutf), AV_OPT_TYPE_INT, {.i64=128}, 0, 256, FLAGS },
1443			{ "lfe_high", "LFE high cut off", OFFSET(highcutf), AV_OPT_TYPE_INT, {.i64=256}, 0, 512, FLAGS },
1444			{ "lfe_mode", "set LFE channel mode", OFFSET(lfe_mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, TFLAGS, .unit = "lfe_mode" },
1445			{ "add", "just add LFE channel", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 1, TFLAGS, .unit = "lfe_mode" },
1446			{ "sub", "subtract LFE channel with others", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 1, TFLAGS, .unit = "lfe_mode" },
1447			{ "smooth", "set temporal smoothness strength", OFFSET(smooth), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 1, TFLAGS },
1448			{ "angle", "set soundfield transform angle", OFFSET(angle), AV_OPT_TYPE_FLOAT, {.dbl=90}, 0, 360, TFLAGS },
1449			{ "focus", "set soundfield transform focus", OFFSET(focus), AV_OPT_TYPE_FLOAT, {.dbl=0}, -1, 1, TFLAGS },
1450			{ "fc_in", "set front center channel input level", OFFSET(f_i[SC_FC]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1451			{ "fc_out", "set front center channel output level", OFFSET(f_o[SC_FC]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1452			{ "fl_in", "set front left channel input level", OFFSET(f_i[SC_FL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1453			{ "fl_out", "set front left channel output level", OFFSET(f_o[SC_FL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1454			{ "fr_in", "set front right channel input level", OFFSET(f_i[SC_FR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1455			{ "fr_out", "set front right channel output level", OFFSET(f_o[SC_FR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1456			{ "sl_in", "set side left channel input level", OFFSET(f_i[SC_SL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1457			{ "sl_out", "set side left channel output level", OFFSET(f_o[SC_SL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1458			{ "sr_in", "set side right channel input level", OFFSET(f_i[SC_SR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1459			{ "sr_out", "set side right channel output level", OFFSET(f_o[SC_SR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1460			{ "bl_in", "set back left channel input level", OFFSET(f_i[SC_BL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1461			{ "bl_out", "set back left channel output level", OFFSET(f_o[SC_BL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1462			{ "br_in", "set back right channel input level", OFFSET(f_i[SC_BR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1463			{ "br_out", "set back right channel output level", OFFSET(f_o[SC_BR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1464			{ "bc_in", "set back center channel input level", OFFSET(f_i[SC_BC]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1465			{ "bc_out", "set back center channel output level", OFFSET(f_o[SC_BC]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1466			{ "lfe_in", "set lfe channel input level", OFFSET(f_i[SC_LF]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1467			{ "lfe_out", "set lfe channel output level", OFFSET(f_o[SC_LF]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1468			{ "allx", "set all channel's x spread", OFFSET(all_x), AV_OPT_TYPE_FLOAT, {.dbl=-1}, -1, 15, TFLAGS },
1469			{ "ally", "set all channel's y spread", OFFSET(all_y), AV_OPT_TYPE_FLOAT, {.dbl=-1}, -1, 15, TFLAGS },
1470			{ "fcx", "set front center channel x spread", OFFSET(f_x[SC_FC]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1471			{ "flx", "set front left channel x spread", OFFSET(f_x[SC_FL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1472			{ "frx", "set front right channel x spread", OFFSET(f_x[SC_FR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1473			{ "blx", "set back left channel x spread", OFFSET(f_x[SC_BL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1474			{ "brx", "set back right channel x spread", OFFSET(f_x[SC_BR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1475			{ "slx", "set side left channel x spread", OFFSET(f_x[SC_SL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1476			{ "srx", "set side right channel x spread", OFFSET(f_x[SC_SR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1477			{ "bcx", "set back center channel x spread", OFFSET(f_x[SC_BC]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1478			{ "fcy", "set front center channel y spread", OFFSET(f_y[SC_FC]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1479			{ "fly", "set front left channel y spread", OFFSET(f_y[SC_FL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1480			{ "fry", "set front right channel y spread", OFFSET(f_y[SC_FR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1481			{ "bly", "set back left channel y spread", OFFSET(f_y[SC_BL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1482			{ "bry", "set back right channel y spread", OFFSET(f_y[SC_BR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1483			{ "sly", "set side left channel y spread", OFFSET(f_y[SC_SL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1484			{ "sry", "set side right channel y spread", OFFSET(f_y[SC_SR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1485			{ "bcy", "set back center channel y spread", OFFSET(f_y[SC_BC]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1486			{ "win_size", "set window size", OFFSET(win_size), AV_OPT_TYPE_INT, {.i64=4096},1024,65536,FLAGS },
1487			WIN_FUNC_OPTION("win_func", OFFSET(win_func), FLAGS, WFUNC_HANNING),
1488			{ "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0, 1, TFLAGS },
1489			{ NULL }
1490			};
1491
1492			AVFILTER_DEFINE_CLASS(surround);
1493
1494			static const AVFilterPad inputs[] = {
1495			{
1496			.name = "default",
1497			.type = AVMEDIA_TYPE_AUDIO,
1498			.config_props = config_input,
1499			},
1500			};
1501
1502			static const AVFilterPad outputs[] = {
1503			{
1504			.name = "default",
1505			.type = AVMEDIA_TYPE_AUDIO,
1506			.config_props = config_output,
1507			},
1508			};
1509
1510			const AVFilter ff_af_surround = {
1511			.name = "surround",
1512			.description = NULL_IF_CONFIG_SMALL("Apply audio surround upmix filter."),
1513			.priv_size = sizeof(AudioSurroundContext),
1514			.priv_class = &surround_class,
1515			.init = init,
1516			.uninit = uninit,
1517			.activate = activate,
1518			FILTER_INPUTS(inputs),
1519			FILTER_OUTPUTS(outputs),
1520			FILTER_QUERY_FUNC(query_formats),
1521			.flags = AVFILTER_FLAG_SLICE_THREADS,
1522			.process_command = process_command,
1523			};
1524