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(const AVFilterContext *ctx,
150			AVFilterFormatsConfig **cfg_in,
151			AVFilterFormatsConfig **cfg_out)
152			{
153			static const enum AVSampleFormat formats[] = {
154			AV_SAMPLE_FMT_FLTP,
155			AV_SAMPLE_FMT_NONE,
156			};
157
158		✗	const AudioSurroundContext *s = ctx->priv;
159		✗	AVFilterChannelLayouts *layouts = NULL;
160			int ret;
161
162		✗	ret = ff_set_sample_formats_from_list2(ctx, cfg_in, cfg_out, formats);
163		✗	if (ret)
164		✗	return ret;
165
166		✗	layouts = NULL;
167		✗	ret = ff_add_channel_layout(&layouts, &s->out_ch_layout);
168		✗	if (ret)
169		✗	return ret;
170
171		✗	ret = ff_channel_layouts_ref(layouts, &cfg_out[0]->channel_layouts);
172		✗	if (ret)
173		✗	return ret;
174
175		✗	layouts = NULL;
176		✗	ret = ff_add_channel_layout(&layouts, &s->in_ch_layout);
177		✗	if (ret)
178		✗	return ret;
179
180		✗	ret = ff_channel_layouts_ref(layouts, &cfg_in[0]->channel_layouts);
181		✗	if (ret)
182		✗	return ret;
183
184		✗	return 0;
185			}
186
187		✗	static void set_input_levels(AVFilterContext *ctx)
188			{
189		✗	AudioSurroundContext *s = ctx->priv;
190
191		✗	for (int ch = 0; ch < s->nb_in_channels && s->level_in >= 0.f; ch++)
192		✗	s->input_levels[ch] = s->level_in;
193		✗	s->level_in = -1.f;
194
195		✗	for (int n = 0; n < SC_NB; n++) {
196		✗	const int ch = av_channel_layout_index_from_channel(&s->in_ch_layout, ch_map[n]);
197		✗	if (ch >= 0)
198		✗	s->input_levels[ch] = s->f_i[n];
199			}
200		✗	}
201
202		✗	static void set_output_levels(AVFilterContext *ctx)
203			{
204		✗	AudioSurroundContext *s = ctx->priv;
205
206		✗	for (int ch = 0; ch < s->nb_out_channels && s->level_out >= 0.f; ch++)
207		✗	s->output_levels[ch] = s->level_out;
208		✗	s->level_out = -1.f;
209
210		✗	for (int n = 0; n < SC_NB; n++) {
211		✗	const int ch = av_channel_layout_index_from_channel(&s->out_ch_layout, ch_map[n]);
212		✗	if (ch >= 0)
213		✗	s->output_levels[ch] = s->f_o[n];
214			}
215		✗	}
216
217		✗	static int config_input(AVFilterLink *inlink)
218			{
219		✗	AVFilterContext *ctx = inlink->dst;
220		✗	AudioSurroundContext *s = ctx->priv;
221			int ret;
222
223		✗	s->rdft = av_calloc(inlink->ch_layout.nb_channels, sizeof(*s->rdft));
224		✗	if (!s->rdft)
225		✗	return AVERROR(ENOMEM);
226		✗	s->nb_in_channels = inlink->ch_layout.nb_channels;
227
228		✗	for (int ch = 0; ch < inlink->ch_layout.nb_channels; ch++) {
229		✗	float scale = 1.f;
230
231		✗	ret = av_tx_init(&s->rdft[ch], &s->tx_fn, AV_TX_FLOAT_RDFT,
232			0, s->win_size, &scale, 0);
233		✗	if (ret < 0)
234		✗	return ret;
235			}
236
237		✗	s->input_levels = av_malloc_array(s->nb_in_channels, sizeof(*s->input_levels));
238		✗	if (!s->input_levels)
239		✗	return AVERROR(ENOMEM);
240
241		✗	set_input_levels(ctx);
242
243		✗	s->window = ff_get_audio_buffer(inlink, s->win_size * 2);
244		✗	if (!s->window)
245		✗	return AVERROR(ENOMEM);
246
247		✗	s->input_in = ff_get_audio_buffer(inlink, s->win_size * 2);
248		✗	if (!s->input_in)
249		✗	return AVERROR(ENOMEM);
250
251		✗	s->input = ff_get_audio_buffer(inlink, s->win_size + 2);
252		✗	if (!s->input)
253		✗	return AVERROR(ENOMEM);
254
255		✗	s->lowcut = 1.f * s->lowcutf / (inlink->sample_rate * 0.5) * (s->win_size / 2);
256		✗	s->highcut = 1.f * s->highcutf / (inlink->sample_rate * 0.5) * (s->win_size / 2);
257
258		✗	return 0;
259			}
260
261		✗	static int config_output(AVFilterLink *outlink)
262			{
263		✗	AVFilterContext *ctx = outlink->src;
264		✗	AudioSurroundContext *s = ctx->priv;
265			int ret;
266
267		✗	s->irdft = av_calloc(outlink->ch_layout.nb_channels, sizeof(*s->irdft));
268		✗	if (!s->irdft)
269		✗	return AVERROR(ENOMEM);
270		✗	s->nb_out_channels = outlink->ch_layout.nb_channels;
271
272		✗	for (int ch = 0; ch < outlink->ch_layout.nb_channels; ch++) {
273		✗	float iscale = 1.f;
274
275		✗	ret = av_tx_init(&s->irdft[ch], &s->itx_fn, AV_TX_FLOAT_RDFT,
276			1, s->win_size, &iscale, 0);
277		✗	if (ret < 0)
278		✗	return ret;
279			}
280
281		✗	s->output_levels = av_malloc_array(s->nb_out_channels, sizeof(*s->output_levels));
282		✗	if (!s->output_levels)
283		✗	return AVERROR(ENOMEM);
284
285		✗	set_output_levels(ctx);
286
287		✗	s->factors = ff_get_audio_buffer(outlink, s->win_size + 2);
288		✗	s->sfactors = ff_get_audio_buffer(outlink, s->win_size + 2);
289		✗	s->output_ph = ff_get_audio_buffer(outlink, s->win_size + 2);
290		✗	s->output_mag = ff_get_audio_buffer(outlink, s->win_size + 2);
291		✗	s->output_out = ff_get_audio_buffer(outlink, s->win_size + 2);
292		✗	s->output = ff_get_audio_buffer(outlink, s->win_size + 2);
293		✗	s->overlap_buffer = ff_get_audio_buffer(outlink, s->win_size * 2);
294		✗	if (!s->overlap_buffer || !s->output || !s->output_out || !s->output_mag ||
295		✗	!s->output_ph || !s->factors || !s->sfactors)
296		✗	return AVERROR(ENOMEM);
297
298		✗	s->rdft_size = s->win_size / 2 + 1;
299
300		✗	s->x_pos = av_calloc(s->rdft_size, sizeof(*s->x_pos));
301		✗	s->y_pos = av_calloc(s->rdft_size, sizeof(*s->y_pos));
302		✗	s->l_phase = av_calloc(s->rdft_size, sizeof(*s->l_phase));
303		✗	s->r_phase = av_calloc(s->rdft_size, sizeof(*s->r_phase));
304		✗	s->c_mag = av_calloc(s->rdft_size, sizeof(*s->c_mag));
305		✗	s->c_phase = av_calloc(s->rdft_size, sizeof(*s->c_phase));
306		✗	s->mag_total = av_calloc(s->rdft_size, sizeof(*s->mag_total));
307		✗	s->lfe_mag = av_calloc(s->rdft_size, sizeof(*s->lfe_mag));
308		✗	s->lfe_phase = av_calloc(s->rdft_size, sizeof(*s->lfe_phase));
309		✗	if (!s->x_pos || !s->y_pos || !s->l_phase || !s->r_phase || !s->lfe_phase ||
310		✗	!s->c_phase || !s->mag_total || !s->lfe_mag || !s->c_mag)
311		✗	return AVERROR(ENOMEM);
312
313		✗	return 0;
314			}
315
316		✗	static float sqrf(float x)
317			{
318		✗	return x * x;
319			}
320
321		✗	static float r_distance(float a)
322			{
323		✗	return fminf(sqrtf(1.f + sqrf(tanf(a))), sqrtf(1.f + sqrf(1.f / tanf(a))));
324			}
325
326			#define MIN_MAG_SUM 0.00000001f
327
328		✗	static void angle_transform(float *x, float *y, float angle)
329			{
330			float reference, r, a;
331
332		✗	if (angle == 90.f)
333		✗	return;
334
335		✗	reference = angle * M_PIf / 180.f;
336		✗	r = hypotf(*x, *y);
337		✗	a = atan2f(*x, *y);
338
339		✗	r /= r_distance(a);
340
341		✗	if (fabsf(a) <= M_PI_4f)
342		✗	a *= reference / M_PI_2f;
343			else
344		✗	a = M_PIf + (-2.f * M_PIf + reference) * (M_PIf - fabsf(a)) * FFDIFFSIGN(a, 0.f) / (3.f * M_PI_2f);
345
346		✗	r *= r_distance(a);
347
348		✗	*x = av_clipf(sinf(a) * r, -1.f, 1.f);
349		✗	*y = av_clipf(cosf(a) * r, -1.f, 1.f);
350			}
351
352		✗	static void focus_transform(float *x, float *y, float focus)
353			{
354			float a, r, ra;
355
356		✗	if (focus == 0.f)
357		✗	return;
358
359		✗	a = atan2f(*x, *y);
360		✗	ra = r_distance(a);
361		✗	r = av_clipf(hypotf(*x, *y) / ra, 0.f, 1.f);
362		✗	r = focus > 0.f ? 1.f - powf(1.f - r, 1.f + focus * 20.f) : powf(r, 1.f - focus * 20.f);
363		✗	r *= ra;
364		✗	*x = av_clipf(sinf(a) * r, -1.f, 1.f);
365		✗	*y = av_clipf(cosf(a) * r, -1.f, 1.f);
366			}
367
368		✗	static void stereo_position(float a, float p, float *x, float *y)
369			{
370			av_assert2(a >= -1.f && a <= 1.f);
371			av_assert2(p >= 0.f && p <= M_PIf);
372		✗	*x = av_clipf(a+a*fmaxf(0.f, p*p-M_PI_2f), -1.f, 1.f);
373		✗	*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);
374		✗	}
375
376		✗	static inline void get_lfe(int output_lfe, int n, float lowcut, float highcut,
377			float *lfe_mag, float c_mag, float *mag_total, int lfe_mode)
378			{
379		✗	if (output_lfe && n < highcut) {
380		✗	*lfe_mag = n < lowcut ? 1.f : .5f*(1.f+cosf(M_PIf*(lowcut-n)/(lowcut-highcut)));
381		✗	*lfe_mag *= c_mag;
382		✗	if (lfe_mode)
383		✗	*mag_total -= *lfe_mag;
384			} else {
385		✗	*lfe_mag = 0.f;
386			}
387		✗	}
388
389			#define TRANSFORM \
390			dst[2 * n ] = mag * cosf(ph); \
391			dst[2 * n + 1] = mag * sinf(ph);
392
393		✗	static void calculate_factors(AVFilterContext *ctx, int ch, int chan)
394			{
395		✗	AudioSurroundContext *s = ctx->priv;
396		✗	float *factor = (float *)s->factors->extended_data[ch];
397		✗	const float f_x = s->f_x[sc_map[chan >= 0 ? chan : 0]];
398		✗	const float f_y = s->f_y[sc_map[chan >= 0 ? chan : 0]];
399		✗	const int rdft_size = s->rdft_size;
400		✗	const float *x = s->x_pos;
401		✗	const float *y = s->y_pos;
402
403		✗	switch (chan) {
404		✗	case AV_CHAN_FRONT_CENTER:
405		✗	for (int n = 0; n < rdft_size; n++)
406		✗	factor[n] = powf(1.f - fabsf(x[n]), f_x) * powf((y[n] + 1.f) * .5f, f_y);
407		✗	break;
408		✗	case AV_CHAN_FRONT_LEFT:
409		✗	for (int n = 0; n < rdft_size; n++)
410		✗	factor[n] = powf(.5f * ( x[n] + 1.f), f_x) * powf((y[n] + 1.f) * .5f, f_y);
411		✗	break;
412		✗	case AV_CHAN_FRONT_RIGHT:
413		✗	for (int n = 0; n < rdft_size; n++)
414		✗	factor[n] = powf(.5f * (-x[n] + 1.f), f_x) * powf((y[n] + 1.f) * .5f, f_y);
415		✗	break;
416		✗	case AV_CHAN_LOW_FREQUENCY:
417		✗	for (int n = 0; n < rdft_size; n++)
418		✗	factor[n] = powf(1.f - fabsf(x[n]), f_x) * powf((1.f - fabsf(y[n])), f_y);
419		✗	break;
420		✗	case AV_CHAN_BACK_CENTER:
421		✗	for (int n = 0; n < rdft_size; n++)
422		✗	factor[n] = powf(1.f - fabsf(x[n]), f_x) * powf((1.f - y[n]) * .5f, f_y);
423		✗	break;
424		✗	case AV_CHAN_BACK_LEFT:
425		✗	for (int n = 0; n < rdft_size; n++)
426		✗	factor[n] = powf(.5f * ( x[n] + 1.f), f_x) * powf(1.f - ((y[n] + 1.f) * .5f), f_y);
427		✗	break;
428		✗	case AV_CHAN_BACK_RIGHT:
429		✗	for (int n = 0; n < rdft_size; n++)
430		✗	factor[n] = powf(.5f * (-x[n] + 1.f), f_x) * powf(1.f - ((y[n] + 1.f) * .5f), f_y);
431		✗	break;
432		✗	case AV_CHAN_SIDE_LEFT:
433		✗	for (int n = 0; n < rdft_size; n++)
434		✗	factor[n] = powf(.5f * ( x[n] + 1.f), f_x) * powf(1.f - fabsf(y[n]), f_y);
435		✗	break;
436		✗	case AV_CHAN_SIDE_RIGHT:
437		✗	for (int n = 0; n < rdft_size; n++)
438		✗	factor[n] = powf(.5f * (-x[n] + 1.f), f_x) * powf(1.f - fabsf(y[n]), f_y);
439		✗	break;
440		✗	default:
441		✗	for (int n = 0; n < rdft_size; n++)
442		✗	factor[n] = 1.f;
443		✗	break;
444			}
445		✗	}
446
447		✗	static void do_transform(AVFilterContext *ctx, int ch)
448			{
449		✗	AudioSurroundContext *s = ctx->priv;
450		✗	float *sfactor = (float *)s->sfactors->extended_data[ch];
451		✗	float *factor = (float *)s->factors->extended_data[ch];
452		✗	float *omag = (float *)s->output_mag->extended_data[ch];
453		✗	float *oph = (float *)s->output_ph->extended_data[ch];
454		✗	float *dst = (float *)s->output->extended_data[ch];
455		✗	const int rdft_size = s->rdft_size;
456		✗	const float smooth = s->smooth;
457
458		✗	if (smooth > 0.f) {
459		✗	for (int n = 0; n < rdft_size; n++)
460		✗	sfactor[n] = smooth * factor[n] + (1.f - smooth) * sfactor[n];
461
462		✗	factor = sfactor;
463			}
464
465		✗	for (int n = 0; n < rdft_size; n++)
466		✗	omag[n] *= factor[n];
467
468		✗	for (int n = 0; n < rdft_size; n++) {
469		✗	const float mag = omag[n];
470		✗	const float ph = oph[n];
471
472		✗	TRANSFORM
473			}
474		✗	}
475
476		✗	static void stereo_copy(AVFilterContext *ctx, int ch, int chan)
477			{
478		✗	AudioSurroundContext *s = ctx->priv;
479		✗	float *omag = (float *)s->output_mag->extended_data[ch];
480		✗	float *oph = (float *)s->output_ph->extended_data[ch];
481		✗	const float *mag_total = s->mag_total;
482		✗	const int rdft_size = s->rdft_size;
483		✗	const float *c_phase = s->c_phase;
484		✗	const float *l_phase = s->l_phase;
485		✗	const float *r_phase = s->r_phase;
486		✗	const float *lfe_mag = s->lfe_mag;
487		✗	const float *c_mag = s->c_mag;
488
489		✗	switch (chan) {
490		✗	case AV_CHAN_FRONT_CENTER:
491		✗	memcpy(omag, c_mag, rdft_size * sizeof(*omag));
492		✗	break;
493		✗	case AV_CHAN_LOW_FREQUENCY:
494		✗	memcpy(omag, lfe_mag, rdft_size * sizeof(*omag));
495		✗	break;
496		✗	case AV_CHAN_FRONT_LEFT:
497			case AV_CHAN_FRONT_RIGHT:
498			case AV_CHAN_BACK_CENTER:
499			case AV_CHAN_BACK_LEFT:
500			case AV_CHAN_BACK_RIGHT:
501			case AV_CHAN_SIDE_LEFT:
502			case AV_CHAN_SIDE_RIGHT:
503		✗	memcpy(omag, mag_total, rdft_size * sizeof(*omag));
504		✗	break;
505		✗	default:
506		✗	break;
507			}
508
509		✗	switch (chan) {
510		✗	case AV_CHAN_FRONT_CENTER:
511			case AV_CHAN_LOW_FREQUENCY:
512			case AV_CHAN_BACK_CENTER:
513		✗	memcpy(oph, c_phase, rdft_size * sizeof(*oph));
514		✗	break;
515		✗	case AV_CHAN_FRONT_LEFT:
516			case AV_CHAN_BACK_LEFT:
517			case AV_CHAN_SIDE_LEFT:
518		✗	memcpy(oph, l_phase, rdft_size * sizeof(*oph));
519		✗	break;
520		✗	case AV_CHAN_FRONT_RIGHT:
521			case AV_CHAN_BACK_RIGHT:
522			case AV_CHAN_SIDE_RIGHT:
523		✗	memcpy(oph, r_phase, rdft_size * sizeof(*oph));
524		✗	break;
525		✗	default:
526		✗	break;
527			}
528		✗	}
529
530		✗	static void stereo_upmix(AVFilterContext *ctx, int ch)
531			{
532		✗	AudioSurroundContext *s = ctx->priv;
533		✗	const int chan = av_channel_layout_channel_from_index(&s->out_ch_layout, ch);
534
535		✗	calculate_factors(ctx, ch, chan);
536
537		✗	stereo_copy(ctx, ch, chan);
538
539		✗	do_transform(ctx, ch);
540		✗	}
541
542		✗	static void l2_1_upmix(AVFilterContext *ctx, int ch)
543			{
544		✗	AudioSurroundContext *s = ctx->priv;
545		✗	const int chan = av_channel_layout_channel_from_index(&s->out_ch_layout, ch);
546		✗	float *omag = (float *)s->output_mag->extended_data[ch];
547		✗	float *oph = (float *)s->output_ph->extended_data[ch];
548		✗	const float *mag_total = s->mag_total;
549		✗	const float *lfe_phase = s->lfe_phase;
550		✗	const int rdft_size = s->rdft_size;
551		✗	const float *c_phase = s->c_phase;
552		✗	const float *l_phase = s->l_phase;
553		✗	const float *r_phase = s->r_phase;
554		✗	const float *lfe_mag = s->lfe_mag;
555		✗	const float *c_mag = s->c_mag;
556
557		✗	switch (chan) {
558		✗	case AV_CHAN_LOW_FREQUENCY:
559		✗	calculate_factors(ctx, ch, -1);
560		✗	break;
561		✗	default:
562		✗	calculate_factors(ctx, ch, chan);
563		✗	break;
564			}
565
566		✗	switch (chan) {
567		✗	case AV_CHAN_FRONT_CENTER:
568		✗	memcpy(omag, c_mag, rdft_size * sizeof(*omag));
569		✗	break;
570		✗	case AV_CHAN_LOW_FREQUENCY:
571		✗	memcpy(omag, lfe_mag, rdft_size * sizeof(*omag));
572		✗	break;
573		✗	case AV_CHAN_FRONT_LEFT:
574			case AV_CHAN_FRONT_RIGHT:
575			case AV_CHAN_BACK_CENTER:
576			case AV_CHAN_BACK_LEFT:
577			case AV_CHAN_BACK_RIGHT:
578			case AV_CHAN_SIDE_LEFT:
579			case AV_CHAN_SIDE_RIGHT:
580		✗	memcpy(omag, mag_total, rdft_size * sizeof(*omag));
581		✗	break;
582		✗	default:
583		✗	break;
584			}
585
586		✗	switch (chan) {
587		✗	case AV_CHAN_LOW_FREQUENCY:
588		✗	memcpy(oph, lfe_phase, rdft_size * sizeof(*oph));
589		✗	break;
590		✗	case AV_CHAN_FRONT_CENTER:
591			case AV_CHAN_BACK_CENTER:
592		✗	memcpy(oph, c_phase, rdft_size * sizeof(*oph));
593		✗	break;
594		✗	case AV_CHAN_FRONT_LEFT:
595			case AV_CHAN_BACK_LEFT:
596			case AV_CHAN_SIDE_LEFT:
597		✗	memcpy(oph, l_phase, rdft_size * sizeof(*oph));
598		✗	break;
599		✗	case AV_CHAN_FRONT_RIGHT:
600			case AV_CHAN_BACK_RIGHT:
601			case AV_CHAN_SIDE_RIGHT:
602		✗	memcpy(oph, r_phase, rdft_size * sizeof(*oph));
603		✗	break;
604		✗	default:
605		✗	break;
606			}
607
608		✗	do_transform(ctx, ch);
609		✗	}
610
611		✗	static void surround_upmix(AVFilterContext *ctx, int ch)
612			{
613		✗	AudioSurroundContext *s = ctx->priv;
614		✗	const int chan = av_channel_layout_channel_from_index(&s->out_ch_layout, ch);
615
616		✗	switch (chan) {
617		✗	case AV_CHAN_FRONT_CENTER:
618		✗	calculate_factors(ctx, ch, -1);
619		✗	break;
620		✗	default:
621		✗	calculate_factors(ctx, ch, chan);
622		✗	break;
623			}
624
625		✗	stereo_copy(ctx, ch, chan);
626
627		✗	do_transform(ctx, ch);
628		✗	}
629
630		✗	static void upmix_7_1_5_0_side(AVFilterContext *ctx,
631			float c_re, float c_im,
632			float mag_totall, float mag_totalr,
633			float fl_phase, float fr_phase,
634			float bl_phase, float br_phase,
635			float sl_phase, float sr_phase,
636			float xl, float yl,
637			float xr, float yr,
638			int n)
639			{
640			float fl_mag, fr_mag, ls_mag, rs_mag, lb_mag, rb_mag;
641			float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb, *dstlfe;
642		✗	float lfe_mag, c_phase, mag_total = (mag_totall + mag_totalr) * 0.5f;
643		✗	AudioSurroundContext *s = ctx->priv;
644
645		✗	dstl = (float *)s->output->extended_data[0];
646		✗	dstr = (float *)s->output->extended_data[1];
647		✗	dstc = (float *)s->output->extended_data[2];
648		✗	dstlfe = (float *)s->output->extended_data[3];
649		✗	dstlb = (float *)s->output->extended_data[4];
650		✗	dstrb = (float *)s->output->extended_data[5];
651		✗	dstls = (float *)s->output->extended_data[6];
652		✗	dstrs = (float *)s->output->extended_data[7];
653
654		✗	c_phase = atan2f(c_im, c_re);
655
656		✗	get_lfe(s->output_lfe, n, s->lowcut, s->highcut, &lfe_mag, hypotf(c_re, c_im), &mag_total, s->lfe_mode);
657
658		✗	fl_mag = powf(.5f * (xl + 1.f), s->f_x[SC_FL]) * powf((yl + 1.f) * .5f, s->f_y[SC_FL]) * mag_totall;
659		✗	fr_mag = powf(.5f * (xr + 1.f), s->f_x[SC_FR]) * powf((yr + 1.f) * .5f, s->f_y[SC_FR]) * mag_totalr;
660		✗	lb_mag = powf(.5f * (-xl + 1.f), s->f_x[SC_BL]) * powf((yl + 1.f) * .5f, s->f_y[SC_BL]) * mag_totall;
661		✗	rb_mag = powf(.5f * (-xr + 1.f), s->f_x[SC_BR]) * powf((yr + 1.f) * .5f, s->f_y[SC_BR]) * mag_totalr;
662		✗	ls_mag = powf(1.f - fabsf(xl), s->f_x[SC_SL]) * powf((yl + 1.f) * .5f, s->f_y[SC_SL]) * mag_totall;
663		✗	rs_mag = powf(1.f - fabsf(xr), s->f_x[SC_SR]) * powf((yr + 1.f) * .5f, s->f_y[SC_SR]) * mag_totalr;
664
665		✗	dstl[2 * n ] = fl_mag * cosf(fl_phase);
666		✗	dstl[2 * n + 1] = fl_mag * sinf(fl_phase);
667
668		✗	dstr[2 * n ] = fr_mag * cosf(fr_phase);
669		✗	dstr[2 * n + 1] = fr_mag * sinf(fr_phase);
670
671		✗	dstc[2 * n ] = c_re;
672		✗	dstc[2 * n + 1] = c_im;
673
674		✗	dstlfe[2 * n ] = lfe_mag * cosf(c_phase);
675		✗	dstlfe[2 * n + 1] = lfe_mag * sinf(c_phase);
676
677		✗	dstlb[2 * n ] = lb_mag * cosf(bl_phase);
678		✗	dstlb[2 * n + 1] = lb_mag * sinf(bl_phase);
679
680		✗	dstrb[2 * n ] = rb_mag * cosf(br_phase);
681		✗	dstrb[2 * n + 1] = rb_mag * sinf(br_phase);
682
683		✗	dstls[2 * n ] = ls_mag * cosf(sl_phase);
684		✗	dstls[2 * n + 1] = ls_mag * sinf(sl_phase);
685
686		✗	dstrs[2 * n ] = rs_mag * cosf(sr_phase);
687		✗	dstrs[2 * n + 1] = rs_mag * sinf(sr_phase);
688		✗	}
689
690		✗	static void upmix_7_1_5_1(AVFilterContext *ctx,
691			float c_re, float c_im,
692			float lfe_re, float lfe_im,
693			float mag_totall, float mag_totalr,
694			float fl_phase, float fr_phase,
695			float bl_phase, float br_phase,
696			float sl_phase, float sr_phase,
697			float xl, float yl,
698			float xr, float yr,
699			int n)
700			{
701			float fl_mag, fr_mag, ls_mag, rs_mag, lb_mag, rb_mag;
702			float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb, *dstlfe;
703		✗	AudioSurroundContext *s = ctx->priv;
704
705		✗	dstl = (float *)s->output->extended_data[0];
706		✗	dstr = (float *)s->output->extended_data[1];
707		✗	dstc = (float *)s->output->extended_data[2];
708		✗	dstlfe = (float *)s->output->extended_data[3];
709		✗	dstlb = (float *)s->output->extended_data[4];
710		✗	dstrb = (float *)s->output->extended_data[5];
711		✗	dstls = (float *)s->output->extended_data[6];
712		✗	dstrs = (float *)s->output->extended_data[7];
713
714		✗	fl_mag = powf(.5f * (xl + 1.f), s->f_x[SC_FL]) * powf((yl + 1.f) * .5f, s->f_y[SC_FL]) * mag_totall;
715		✗	fr_mag = powf(.5f * (xr + 1.f), s->f_x[SC_FR]) * powf((yr + 1.f) * .5f, s->f_y[SC_FR]) * mag_totalr;
716		✗	lb_mag = powf(.5f * (-xl + 1.f), s->f_x[SC_BL]) * powf((yl + 1.f) * .5f, s->f_y[SC_BL]) * mag_totall;
717		✗	rb_mag = powf(.5f * (-xr + 1.f), s->f_x[SC_BR]) * powf((yr + 1.f) * .5f, s->f_y[SC_BR]) * mag_totalr;
718		✗	ls_mag = powf(1.f - fabsf(xl), s->f_x[SC_SL]) * powf((yl + 1.f) * .5f, s->f_y[SC_SL]) * mag_totall;
719		✗	rs_mag = powf(1.f - fabsf(xr), s->f_x[SC_SR]) * powf((yr + 1.f) * .5f, s->f_y[SC_SR]) * mag_totalr;
720
721		✗	dstl[2 * n ] = fl_mag * cosf(fl_phase);
722		✗	dstl[2 * n + 1] = fl_mag * sinf(fl_phase);
723
724		✗	dstr[2 * n ] = fr_mag * cosf(fr_phase);
725		✗	dstr[2 * n + 1] = fr_mag * sinf(fr_phase);
726
727		✗	dstc[2 * n ] = c_re;
728		✗	dstc[2 * n + 1] = c_im;
729
730		✗	dstlfe[2 * n ] = lfe_re;
731		✗	dstlfe[2 * n + 1] = lfe_im;
732
733		✗	dstlb[2 * n ] = lb_mag * cosf(bl_phase);
734		✗	dstlb[2 * n + 1] = lb_mag * sinf(bl_phase);
735
736		✗	dstrb[2 * n ] = rb_mag * cosf(br_phase);
737		✗	dstrb[2 * n + 1] = rb_mag * sinf(br_phase);
738
739		✗	dstls[2 * n ] = ls_mag * cosf(sl_phase);
740		✗	dstls[2 * n + 1] = ls_mag * sinf(sl_phase);
741
742		✗	dstrs[2 * n ] = rs_mag * cosf(sr_phase);
743		✗	dstrs[2 * n + 1] = rs_mag * sinf(sr_phase);
744		✗	}
745
746		✗	static void filter_stereo(AVFilterContext *ctx)
747			{
748		✗	AudioSurroundContext *s = ctx->priv;
749		✗	const float *srcl = (const float *)s->input->extended_data[0];
750		✗	const float *srcr = (const float *)s->input->extended_data[1];
751		✗	const int output_lfe = s->output_lfe && s->create_lfe;
752		✗	const int rdft_size = s->rdft_size;
753		✗	const int lfe_mode = s->lfe_mode;
754		✗	const float highcut = s->highcut;
755		✗	const float lowcut = s->lowcut;
756		✗	const float angle = s->angle;
757		✗	const float focus = s->focus;
758		✗	float *magtotal = s->mag_total;
759		✗	float *lfemag = s->lfe_mag;
760		✗	float *lphase = s->l_phase;
761		✗	float *rphase = s->r_phase;
762		✗	float *cphase = s->c_phase;
763		✗	float *cmag = s->c_mag;
764		✗	float *xpos = s->x_pos;
765		✗	float *ypos = s->y_pos;
766
767		✗	for (int n = 0; n < rdft_size; n++) {
768		✗	float l_re = srcl[2 * n], r_re = srcr[2 * n];
769		✗	float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
770		✗	float c_phase = atan2f(l_im + r_im, l_re + r_re);
771		✗	float l_mag = hypotf(l_re, l_im);
772		✗	float r_mag = hypotf(r_re, r_im);
773		✗	float mag_total = hypotf(l_mag, r_mag);
774		✗	float l_phase = atan2f(l_im, l_re);
775		✗	float r_phase = atan2f(r_im, r_re);
776		✗	float phase_dif = fabsf(l_phase - r_phase);
777		✗	float mag_sum = l_mag + r_mag;
778		✗	float c_mag = mag_sum * 0.5f;
779			float mag_dif, x, y;
780
781		✗	mag_sum = mag_sum < MIN_MAG_SUM ? 1.f : mag_sum;
782		✗	mag_dif = (l_mag - r_mag) / mag_sum;
783		✗	if (phase_dif > M_PIf)
784		✗	phase_dif = 2.f * M_PIf - phase_dif;
785
786		✗	stereo_position(mag_dif, phase_dif, &x, &y);
787		✗	angle_transform(&x, &y, angle);
788		✗	focus_transform(&x, &y, focus);
789		✗	get_lfe(output_lfe, n, lowcut, highcut, &lfemag[n], c_mag, &mag_total, lfe_mode);
790
791		✗	xpos[n] = x;
792		✗	ypos[n] = y;
793		✗	lphase[n] = l_phase;
794		✗	rphase[n] = r_phase;
795		✗	cmag[n] = c_mag;
796		✗	cphase[n] = c_phase;
797		✗	magtotal[n] = mag_total;
798			}
799		✗	}
800
801		✗	static void filter_2_1(AVFilterContext *ctx)
802			{
803		✗	AudioSurroundContext *s = ctx->priv;
804		✗	const float *srcl = (const float *)s->input->extended_data[0];
805		✗	const float *srcr = (const float *)s->input->extended_data[1];
806		✗	const float *srclfe = (const float *)s->input->extended_data[2];
807		✗	const int rdft_size = s->rdft_size;
808		✗	const float angle = s->angle;
809		✗	const float focus = s->focus;
810		✗	float *magtotal = s->mag_total;
811		✗	float *lfephase = s->lfe_phase;
812		✗	float *lfemag = s->lfe_mag;
813		✗	float *lphase = s->l_phase;
814		✗	float *rphase = s->r_phase;
815		✗	float *cphase = s->c_phase;
816		✗	float *cmag = s->c_mag;
817		✗	float *xpos = s->x_pos;
818		✗	float *ypos = s->y_pos;
819
820		✗	for (int n = 0; n < rdft_size; n++) {
821		✗	float l_re = srcl[2 * n], r_re = srcr[2 * n];
822		✗	float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
823		✗	float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
824		✗	float c_phase = atan2f(l_im + r_im, l_re + r_re);
825		✗	float l_mag = hypotf(l_re, l_im);
826		✗	float r_mag = hypotf(r_re, r_im);
827		✗	float lfe_mag = hypotf(lfe_re, lfe_im);
828		✗	float lfe_phase = atan2f(lfe_im, lfe_re);
829		✗	float mag_total = hypotf(l_mag, r_mag);
830		✗	float l_phase = atan2f(l_im, l_re);
831		✗	float r_phase = atan2f(r_im, r_re);
832		✗	float phase_dif = fabsf(l_phase - r_phase);
833		✗	float mag_sum = l_mag + r_mag;
834		✗	float c_mag = mag_sum * 0.5f;
835			float mag_dif, x, y;
836
837		✗	mag_sum = mag_sum < MIN_MAG_SUM ? 1.f : mag_sum;
838		✗	mag_dif = (l_mag - r_mag) / mag_sum;
839		✗	if (phase_dif > M_PIf)
840		✗	phase_dif = 2.f * M_PIf - phase_dif;
841
842		✗	stereo_position(mag_dif, phase_dif, &x, &y);
843		✗	angle_transform(&x, &y, angle);
844		✗	focus_transform(&x, &y, focus);
845
846		✗	xpos[n] = x;
847		✗	ypos[n] = y;
848		✗	lphase[n] = l_phase;
849		✗	rphase[n] = r_phase;
850		✗	cmag[n] = c_mag;
851		✗	cphase[n] = c_phase;
852		✗	lfemag[n] = lfe_mag;
853		✗	lfephase[n] = lfe_phase;
854		✗	magtotal[n] = mag_total;
855			}
856		✗	}
857
858		✗	static void filter_surround(AVFilterContext *ctx)
859			{
860		✗	AudioSurroundContext *s = ctx->priv;
861		✗	const float *srcl = (const float *)s->input->extended_data[0];
862		✗	const float *srcr = (const float *)s->input->extended_data[1];
863		✗	const float *srcc = (const float *)s->input->extended_data[2];
864		✗	const int output_lfe = s->output_lfe && s->create_lfe;
865		✗	const int rdft_size = s->rdft_size;
866		✗	const int lfe_mode = s->lfe_mode;
867		✗	const float highcut = s->highcut;
868		✗	const float lowcut = s->lowcut;
869		✗	const float angle = s->angle;
870		✗	const float focus = s->focus;
871		✗	float *magtotal = s->mag_total;
872		✗	float *lfemag = s->lfe_mag;
873		✗	float *lphase = s->l_phase;
874		✗	float *rphase = s->r_phase;
875		✗	float *cphase = s->c_phase;
876		✗	float *cmag = s->c_mag;
877		✗	float *xpos = s->x_pos;
878		✗	float *ypos = s->y_pos;
879
880		✗	for (int n = 0; n < rdft_size; n++) {
881		✗	float l_re = srcl[2 * n], r_re = srcr[2 * n];
882		✗	float l_im = srcl[2 * n + 1], r_im = srcr[2 * n + 1];
883		✗	float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
884		✗	float c_phase = atan2f(c_im, c_re);
885		✗	float c_mag = hypotf(c_re, c_im);
886		✗	float l_mag = hypotf(l_re, l_im);
887		✗	float r_mag = hypotf(r_re, r_im);
888		✗	float mag_total = hypotf(l_mag, r_mag);
889		✗	float l_phase = atan2f(l_im, l_re);
890		✗	float r_phase = atan2f(r_im, r_re);
891		✗	float phase_dif = fabsf(l_phase - r_phase);
892		✗	float mag_sum = l_mag + r_mag;
893			float mag_dif, x, y;
894
895		✗	mag_sum = mag_sum < MIN_MAG_SUM ? 1.f : mag_sum;
896		✗	mag_dif = (l_mag - r_mag) / mag_sum;
897		✗	if (phase_dif > M_PIf)
898		✗	phase_dif = 2.f * M_PIf - phase_dif;
899
900		✗	stereo_position(mag_dif, phase_dif, &x, &y);
901		✗	angle_transform(&x, &y, angle);
902		✗	focus_transform(&x, &y, focus);
903		✗	get_lfe(output_lfe, n, lowcut, highcut, &lfemag[n], c_mag, &mag_total, lfe_mode);
904
905		✗	xpos[n] = x;
906		✗	ypos[n] = y;
907		✗	lphase[n] = l_phase;
908		✗	rphase[n] = r_phase;
909		✗	cmag[n] = c_mag;
910		✗	cphase[n] = c_phase;
911		✗	magtotal[n] = mag_total;
912			}
913		✗	}
914
915		✗	static void filter_5_0_side(AVFilterContext *ctx)
916			{
917		✗	AudioSurroundContext *s = ctx->priv;
918		✗	const int rdft_size = s->rdft_size;
919			float *srcl, *srcr, *srcc, *srcsl, *srcsr;
920			int n;
921
922		✗	srcl = (float *)s->input->extended_data[0];
923		✗	srcr = (float *)s->input->extended_data[1];
924		✗	srcc = (float *)s->input->extended_data[2];
925		✗	srcsl = (float *)s->input->extended_data[3];
926		✗	srcsr = (float *)s->input->extended_data[4];
927
928		✗	for (n = 0; n < rdft_size; n++) {
929		✗	float fl_re = srcl[2 * n], fr_re = srcr[2 * n];
930		✗	float fl_im = srcl[2 * n + 1], fr_im = srcr[2 * n + 1];
931		✗	float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
932		✗	float sl_re = srcsl[2 * n], sl_im = srcsl[2 * n + 1];
933		✗	float sr_re = srcsr[2 * n], sr_im = srcsr[2 * n + 1];
934		✗	float fl_mag = hypotf(fl_re, fl_im);
935		✗	float fr_mag = hypotf(fr_re, fr_im);
936		✗	float fl_phase = atan2f(fl_im, fl_re);
937		✗	float fr_phase = atan2f(fr_im, fr_re);
938		✗	float sl_mag = hypotf(sl_re, sl_im);
939		✗	float sr_mag = hypotf(sr_re, sr_im);
940		✗	float sl_phase = atan2f(sl_im, sl_re);
941		✗	float sr_phase = atan2f(sr_im, sr_re);
942		✗	float phase_difl = fabsf(fl_phase - sl_phase);
943		✗	float phase_difr = fabsf(fr_phase - sr_phase);
944		✗	float magl_sum = fl_mag + sl_mag;
945		✗	float magr_sum = fr_mag + sr_mag;
946		✗	float mag_difl = magl_sum < MIN_MAG_SUM ? FFDIFFSIGN(fl_mag, sl_mag) : (fl_mag - sl_mag) / magl_sum;
947		✗	float mag_difr = magr_sum < MIN_MAG_SUM ? FFDIFFSIGN(fr_mag, sr_mag) : (fr_mag - sr_mag) / magr_sum;
948		✗	float mag_totall = hypotf(fl_mag, sl_mag);
949		✗	float mag_totalr = hypotf(fr_mag, sr_mag);
950		✗	float bl_phase = atan2f(fl_im + sl_im, fl_re + sl_re);
951		✗	float br_phase = atan2f(fr_im + sr_im, fr_re + sr_re);
952			float xl, yl;
953			float xr, yr;
954
955		✗	if (phase_difl > M_PIf)
956		✗	phase_difl = 2.f * M_PIf - phase_difl;
957
958		✗	if (phase_difr > M_PIf)
959		✗	phase_difr = 2.f * M_PIf - phase_difr;
960
961		✗	stereo_position(mag_difl, phase_difl, &xl, &yl);
962		✗	stereo_position(mag_difr, phase_difr, &xr, &yr);
963
964		✗	s->upmix_5_0(ctx, c_re, c_im,
965			mag_totall, mag_totalr,
966			fl_phase, fr_phase,
967			bl_phase, br_phase,
968			sl_phase, sr_phase,
969			xl, yl, xr, yr, n);
970			}
971		✗	}
972
973		✗	static void filter_5_1_side(AVFilterContext *ctx)
974			{
975		✗	AudioSurroundContext *s = ctx->priv;
976		✗	const int rdft_size = s->rdft_size;
977			float *srcl, *srcr, *srcc, *srclfe, *srcsl, *srcsr;
978			int n;
979
980		✗	srcl = (float *)s->input->extended_data[0];
981		✗	srcr = (float *)s->input->extended_data[1];
982		✗	srcc = (float *)s->input->extended_data[2];
983		✗	srclfe = (float *)s->input->extended_data[3];
984		✗	srcsl = (float *)s->input->extended_data[4];
985		✗	srcsr = (float *)s->input->extended_data[5];
986
987		✗	for (n = 0; n < rdft_size; n++) {
988		✗	float fl_re = srcl[2 * n], fr_re = srcr[2 * n];
989		✗	float fl_im = srcl[2 * n + 1], fr_im = srcr[2 * n + 1];
990		✗	float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
991		✗	float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
992		✗	float sl_re = srcsl[2 * n], sl_im = srcsl[2 * n + 1];
993		✗	float sr_re = srcsr[2 * n], sr_im = srcsr[2 * n + 1];
994		✗	float fl_mag = hypotf(fl_re, fl_im);
995		✗	float fr_mag = hypotf(fr_re, fr_im);
996		✗	float fl_phase = atan2f(fl_im, fl_re);
997		✗	float fr_phase = atan2f(fr_im, fr_re);
998		✗	float sl_mag = hypotf(sl_re, sl_im);
999		✗	float sr_mag = hypotf(sr_re, sr_im);
1000		✗	float sl_phase = atan2f(sl_im, sl_re);
1001		✗	float sr_phase = atan2f(sr_im, sr_re);
1002		✗	float phase_difl = fabsf(fl_phase - sl_phase);
1003		✗	float phase_difr = fabsf(fr_phase - sr_phase);
1004		✗	float magl_sum = fl_mag + sl_mag;
1005		✗	float magr_sum = fr_mag + sr_mag;
1006		✗	float mag_difl = magl_sum < MIN_MAG_SUM ? FFDIFFSIGN(fl_mag, sl_mag) : (fl_mag - sl_mag) / magl_sum;
1007		✗	float mag_difr = magr_sum < MIN_MAG_SUM ? FFDIFFSIGN(fr_mag, sr_mag) : (fr_mag - sr_mag) / magr_sum;
1008		✗	float mag_totall = hypotf(fl_mag, sl_mag);
1009		✗	float mag_totalr = hypotf(fr_mag, sr_mag);
1010		✗	float bl_phase = atan2f(fl_im + sl_im, fl_re + sl_re);
1011		✗	float br_phase = atan2f(fr_im + sr_im, fr_re + sr_re);
1012			float xl, yl;
1013			float xr, yr;
1014
1015		✗	if (phase_difl > M_PIf)
1016		✗	phase_difl = 2.f * M_PIf - phase_difl;
1017
1018		✗	if (phase_difr > M_PIf)
1019		✗	phase_difr = 2.f * M_PIf - phase_difr;
1020
1021		✗	stereo_position(mag_difl, phase_difl, &xl, &yl);
1022		✗	stereo_position(mag_difr, phase_difr, &xr, &yr);
1023
1024		✗	s->upmix_5_1(ctx, c_re, c_im, lfe_re, lfe_im,
1025			mag_totall, mag_totalr,
1026			fl_phase, fr_phase,
1027			bl_phase, br_phase,
1028			sl_phase, sr_phase,
1029			xl, yl, xr, yr, n);
1030			}
1031		✗	}
1032
1033		✗	static void filter_5_1_back(AVFilterContext *ctx)
1034			{
1035		✗	AudioSurroundContext *s = ctx->priv;
1036		✗	const int rdft_size = s->rdft_size;
1037			float *srcl, *srcr, *srcc, *srclfe, *srcbl, *srcbr;
1038			int n;
1039
1040		✗	srcl = (float *)s->input->extended_data[0];
1041		✗	srcr = (float *)s->input->extended_data[1];
1042		✗	srcc = (float *)s->input->extended_data[2];
1043		✗	srclfe = (float *)s->input->extended_data[3];
1044		✗	srcbl = (float *)s->input->extended_data[4];
1045		✗	srcbr = (float *)s->input->extended_data[5];
1046
1047		✗	for (n = 0; n < rdft_size; n++) {
1048		✗	float fl_re = srcl[2 * n], fr_re = srcr[2 * n];
1049		✗	float fl_im = srcl[2 * n + 1], fr_im = srcr[2 * n + 1];
1050		✗	float c_re = srcc[2 * n], c_im = srcc[2 * n + 1];
1051		✗	float lfe_re = srclfe[2 * n], lfe_im = srclfe[2 * n + 1];
1052		✗	float bl_re = srcbl[2 * n], bl_im = srcbl[2 * n + 1];
1053		✗	float br_re = srcbr[2 * n], br_im = srcbr[2 * n + 1];
1054		✗	float fl_mag = hypotf(fl_re, fl_im);
1055		✗	float fr_mag = hypotf(fr_re, fr_im);
1056		✗	float fl_phase = atan2f(fl_im, fl_re);
1057		✗	float fr_phase = atan2f(fr_im, fr_re);
1058		✗	float bl_mag = hypotf(bl_re, bl_im);
1059		✗	float br_mag = hypotf(br_re, br_im);
1060		✗	float bl_phase = atan2f(bl_im, bl_re);
1061		✗	float br_phase = atan2f(br_im, br_re);
1062		✗	float phase_difl = fabsf(fl_phase - bl_phase);
1063		✗	float phase_difr = fabsf(fr_phase - br_phase);
1064		✗	float magl_sum = fl_mag + bl_mag;
1065		✗	float magr_sum = fr_mag + br_mag;
1066		✗	float mag_difl = magl_sum < MIN_MAG_SUM ? FFDIFFSIGN(fl_mag, bl_mag) : (fl_mag - bl_mag) / magl_sum;
1067		✗	float mag_difr = magr_sum < MIN_MAG_SUM ? FFDIFFSIGN(fr_mag, br_mag) : (fr_mag - br_mag) / magr_sum;
1068		✗	float mag_totall = hypotf(fl_mag, bl_mag);
1069		✗	float mag_totalr = hypotf(fr_mag, br_mag);
1070		✗	float sl_phase = atan2f(fl_im + bl_im, fl_re + bl_re);
1071		✗	float sr_phase = atan2f(fr_im + br_im, fr_re + br_re);
1072			float xl, yl;
1073			float xr, yr;
1074
1075		✗	if (phase_difl > M_PIf)
1076		✗	phase_difl = 2.f * M_PIf - phase_difl;
1077
1078		✗	if (phase_difr > M_PIf)
1079		✗	phase_difr = 2.f * M_PIf - phase_difr;
1080
1081		✗	stereo_position(mag_difl, phase_difl, &xl, &yl);
1082		✗	stereo_position(mag_difr, phase_difr, &xr, &yr);
1083
1084		✗	s->upmix_5_1(ctx, c_re, c_im, lfe_re, lfe_im,
1085			mag_totall, mag_totalr,
1086			fl_phase, fr_phase,
1087			bl_phase, br_phase,
1088			sl_phase, sr_phase,
1089			xl, yl, xr, yr, n);
1090			}
1091		✗	}
1092
1093		✗	static void allchannels_spread(AVFilterContext *ctx)
1094			{
1095		✗	AudioSurroundContext *s = ctx->priv;
1096
1097		✗	if (s->all_x >= 0.f)
1098		✗	for (int n = 0; n < SC_NB; n++)
1099		✗	s->f_x[n] = s->all_x;
1100		✗	s->all_x = -1.f;
1101		✗	if (s->all_y >= 0.f)
1102		✗	for (int n = 0; n < SC_NB; n++)
1103		✗	s->f_y[n] = s->all_y;
1104		✗	s->all_y = -1.f;
1105		✗	}
1106
1107		✗	static av_cold int init(AVFilterContext *ctx)
1108			{
1109		✗	AudioSurroundContext *s = ctx->priv;
1110			int64_t in_channel_layout, out_channel_layout;
1111			char in_name[128], out_name[128];
1112			float overlap;
1113
1114		✗	if (s->lowcutf >= s->highcutf) {
1115		✗	av_log(ctx, AV_LOG_ERROR, "Low cut-off '%d' should be less than high cut-off '%d'.\n",
1116			s->lowcutf, s->highcutf);
1117		✗	return AVERROR(EINVAL);
1118			}
1119
1120		✗	in_channel_layout = s->in_ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?
1121		✗	s->in_ch_layout.u.mask : 0;
1122		✗	out_channel_layout = s->out_ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?
1123		✗	s->out_ch_layout.u.mask : 0;
1124
1125		✗	s->create_lfe = av_channel_layout_index_from_channel(&s->out_ch_layout,
1126		✗	AV_CHAN_LOW_FREQUENCY) >= 0;
1127
1128		✗	switch (out_channel_layout) {
1129		✗	case AV_CH_LAYOUT_MONO:
1130			case AV_CH_LAYOUT_STEREO:
1131			case AV_CH_LAYOUT_2POINT1:
1132			case AV_CH_LAYOUT_2_1:
1133			case AV_CH_LAYOUT_2_2:
1134			case AV_CH_LAYOUT_SURROUND:
1135			case AV_CH_LAYOUT_3POINT1:
1136			case AV_CH_LAYOUT_QUAD:
1137			case AV_CH_LAYOUT_4POINT0:
1138			case AV_CH_LAYOUT_4POINT1:
1139			case AV_CH_LAYOUT_5POINT0:
1140			case AV_CH_LAYOUT_5POINT1:
1141			case AV_CH_LAYOUT_5POINT0_BACK:
1142			case AV_CH_LAYOUT_5POINT1_BACK:
1143			case AV_CH_LAYOUT_6POINT0:
1144			case AV_CH_LAYOUT_6POINT1:
1145			case AV_CH_LAYOUT_7POINT0:
1146			case AV_CH_LAYOUT_7POINT1:
1147			case AV_CH_LAYOUT_OCTAGONAL:
1148		✗	break;
1149		✗	default:
1150		✗	goto fail;
1151			}
1152
1153		✗	switch (in_channel_layout) {
1154		✗	case AV_CH_LAYOUT_STEREO:
1155		✗	s->filter = filter_stereo;
1156		✗	s->upmix = stereo_upmix;
1157		✗	break;
1158		✗	case AV_CH_LAYOUT_2POINT1:
1159		✗	s->filter = filter_2_1;
1160		✗	s->upmix = l2_1_upmix;
1161		✗	break;
1162		✗	case AV_CH_LAYOUT_SURROUND:
1163		✗	s->filter = filter_surround;
1164		✗	s->upmix = surround_upmix;
1165		✗	break;
1166		✗	case AV_CH_LAYOUT_5POINT0:
1167		✗	s->filter = filter_5_0_side;
1168		✗	switch (out_channel_layout) {
1169		✗	case AV_CH_LAYOUT_7POINT1:
1170		✗	s->upmix_5_0 = upmix_7_1_5_0_side;
1171		✗	break;
1172		✗	default:
1173		✗	goto fail;
1174			}
1175		✗	break;
1176		✗	case AV_CH_LAYOUT_5POINT1:
1177		✗	s->filter = filter_5_1_side;
1178		✗	switch (out_channel_layout) {
1179		✗	case AV_CH_LAYOUT_7POINT1:
1180		✗	s->upmix_5_1 = upmix_7_1_5_1;
1181		✗	break;
1182		✗	default:
1183		✗	goto fail;
1184			}
1185		✗	break;
1186		✗	case AV_CH_LAYOUT_5POINT1_BACK:
1187		✗	s->filter = filter_5_1_back;
1188		✗	switch (out_channel_layout) {
1189		✗	case AV_CH_LAYOUT_7POINT1:
1190		✗	s->upmix_5_1 = upmix_7_1_5_1;
1191		✗	break;
1192		✗	default:
1193		✗	goto fail;
1194			}
1195		✗	break;
1196			default:
1197		✗	fail:
1198		✗	av_channel_layout_describe(&s->out_ch_layout, out_name, sizeof(out_name));
1199		✗	av_channel_layout_describe(&s->in_ch_layout, in_name, sizeof(in_name));
1200		✗	av_log(ctx, AV_LOG_ERROR, "Unsupported upmix: '%s' -> '%s'.\n",
1201			in_name, out_name);
1202		✗	return AVERROR(EINVAL);
1203			}
1204
1205		✗	s->window_func_lut = av_calloc(s->win_size, sizeof(*s->window_func_lut));
1206		✗	if (!s->window_func_lut)
1207		✗	return AVERROR(ENOMEM);
1208
1209		✗	generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap);
1210		✗	if (s->overlap == 1)
1211		✗	s->overlap = overlap;
1212
1213		✗	for (int i = 0; i < s->win_size; i++)
1214		✗	s->window_func_lut[i] = sqrtf(s->window_func_lut[i] / s->win_size);
1215		✗	s->hop_size = FFMAX(1, s->win_size * (1. - s->overlap));
1216
1217			{
1218		✗	float max = 0.f, *temp_lut = av_calloc(s->win_size, sizeof(*temp_lut));
1219		✗	if (!temp_lut)
1220		✗	return AVERROR(ENOMEM);
1221
1222		✗	for (int j = 0; j < s->win_size; j += s->hop_size) {
1223		✗	for (int i = 0; i < s->win_size; i++)
1224		✗	temp_lut[(i + j) % s->win_size] += s->window_func_lut[i];
1225			}
1226
1227		✗	for (int i = 0; i < s->win_size; i++)
1228		✗	max = fmaxf(temp_lut[i], max);
1229		✗	av_freep(&temp_lut);
1230
1231		✗	s->win_gain = 1.f / (max * sqrtf(s->win_size));
1232			}
1233
1234		✗	allchannels_spread(ctx);
1235
1236		✗	return 0;
1237			}
1238
1239		✗	static int fft_channel(AVFilterContext *ctx, AVFrame *in, int ch)
1240			{
1241		✗	AudioSurroundContext *s = ctx->priv;
1242		✗	float *src = (float *)s->input_in->extended_data[ch];
1243		✗	float *win = (float *)s->window->extended_data[ch];
1244		✗	const float *window_func_lut = s->window_func_lut;
1245		✗	const int offset = s->win_size - s->hop_size;
1246		✗	const float level_in = s->input_levels[ch];
1247		✗	const int win_size = s->win_size;
1248
1249		✗	memmove(src, &src[s->hop_size], offset * sizeof(float));
1250		✗	memcpy(&src[offset], in->extended_data[ch], in->nb_samples * sizeof(float));
1251		✗	memset(&src[offset + in->nb_samples], 0, (s->hop_size - in->nb_samples) * sizeof(float));
1252
1253		✗	for (int n = 0; n < win_size; n++)
1254		✗	win[n] = src[n] * window_func_lut[n] * level_in;
1255
1256		✗	s->tx_fn(s->rdft[ch], (float *)s->input->extended_data[ch], win, sizeof(float));
1257
1258		✗	return 0;
1259			}
1260
1261		✗	static int fft_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
1262			{
1263		✗	AVFrame *in = arg;
1264		✗	const int start = ff_slice_pos(in->ch_layout.nb_channels, jobnr, nb_jobs);
1265		✗	const int end = ff_slice_pos(in->ch_layout.nb_channels, jobnr + 1, nb_jobs);
1266
1267		✗	for (int ch = start; ch < end; ch++)
1268		✗	fft_channel(ctx, in, ch);
1269
1270		✗	return 0;
1271			}
1272
1273		✗	static int ifft_channel(AVFilterContext *ctx, AVFrame *out, int ch)
1274			{
1275		✗	AudioSurroundContext *s = ctx->priv;
1276		✗	const float level_out = s->output_levels[ch] * s->win_gain;
1277		✗	const float *window_func_lut = s->window_func_lut;
1278		✗	const int win_size = s->win_size;
1279			float *dst, *ptr;
1280
1281		✗	dst = (float *)s->output_out->extended_data[ch];
1282		✗	ptr = (float *)s->overlap_buffer->extended_data[ch];
1283		✗	s->itx_fn(s->irdft[ch], dst, (float *)s->output->extended_data[ch], sizeof(AVComplexFloat));
1284
1285		✗	memmove(s->overlap_buffer->extended_data[ch],
1286		✗	s->overlap_buffer->extended_data[ch] + s->hop_size * sizeof(float),
1287		✗	s->win_size * sizeof(float));
1288		✗	memset(s->overlap_buffer->extended_data[ch] + s->win_size * sizeof(float),
1289		✗	0, s->hop_size * sizeof(float));
1290
1291		✗	for (int n = 0; n < win_size; n++)
1292		✗	ptr[n] += dst[n] * window_func_lut[n] * level_out;
1293
1294		✗	ptr = (float *)s->overlap_buffer->extended_data[ch];
1295		✗	dst = (float *)out->extended_data[ch];
1296		✗	memcpy(dst, ptr, s->hop_size * sizeof(float));
1297
1298		✗	return 0;
1299			}
1300
1301		✗	static int ifft_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
1302			{
1303		✗	AudioSurroundContext *s = ctx->priv;
1304		✗	AVFrame *out = arg;
1305		✗	const int start = ff_slice_pos(out->ch_layout.nb_channels, jobnr, nb_jobs);
1306		✗	const int end = ff_slice_pos(out->ch_layout.nb_channels, jobnr + 1, nb_jobs);
1307
1308		✗	for (int ch = start; ch < end; ch++) {
1309		✗	if (s->upmix)
1310		✗	s->upmix(ctx, ch);
1311		✗	ifft_channel(ctx, out, ch);
1312			}
1313
1314		✗	return 0;
1315			}
1316
1317		✗	static int filter_frame(AVFilterLink *inlink, AVFrame *in)
1318			{
1319		✗	AVFilterContext *ctx = inlink->dst;
1320		✗	AVFilterLink *outlink = ctx->outputs[0];
1321		✗	AudioSurroundContext *s = ctx->priv;
1322			AVFrame *out;
1323
1324		✗	ff_filter_execute(ctx, fft_channels, in, NULL,
1325		✗	FFMIN(inlink->ch_layout.nb_channels,
1326			ff_filter_get_nb_threads(ctx)));
1327
1328		✗	s->filter(ctx);
1329
1330		✗	out = ff_get_audio_buffer(outlink, s->hop_size);
1331		✗	if (!out)
1332		✗	return AVERROR(ENOMEM);
1333
1334		✗	ff_filter_execute(ctx, ifft_channels, out, NULL,
1335		✗	FFMIN(outlink->ch_layout.nb_channels,
1336			ff_filter_get_nb_threads(ctx)));
1337
1338		✗	av_frame_copy_props(out, in);
1339		✗	out->nb_samples = in->nb_samples;
1340
1341		✗	av_frame_free(&in);
1342		✗	return ff_filter_frame(outlink, out);
1343			}
1344
1345		✗	static int activate(AVFilterContext *ctx)
1346			{
1347		✗	AVFilterLink *inlink = ctx->inputs[0];
1348		✗	AVFilterLink *outlink = ctx->outputs[0];
1349		✗	AudioSurroundContext *s = ctx->priv;
1350		✗	AVFrame *in = NULL;
1351		✗	int ret = 0, status;
1352			int64_t pts;
1353
1354		✗	FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
1355
1356		✗	ret = ff_inlink_consume_samples(inlink, s->hop_size, s->hop_size, &in);
1357		✗	if (ret < 0)
1358		✗	return ret;
1359
1360		✗	if (ret > 0)
1361		✗	ret = filter_frame(inlink, in);
1362		✗	if (ret < 0)
1363		✗	return ret;
1364
1365		✗	if (ff_inlink_queued_samples(inlink) >= s->hop_size) {
1366		✗	ff_filter_set_ready(ctx, 10);
1367		✗	return 0;
1368			}
1369
1370		✗	if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
1371		✗	ff_outlink_set_status(outlink, status, pts);
1372		✗	return 0;
1373			}
1374
1375		✗	FF_FILTER_FORWARD_WANTED(outlink, inlink);
1376
1377		✗	return FFERROR_NOT_READY;
1378			}
1379
1380		✗	static av_cold void uninit(AVFilterContext *ctx)
1381			{
1382		✗	AudioSurroundContext *s = ctx->priv;
1383
1384		✗	av_frame_free(&s->factors);
1385		✗	av_frame_free(&s->sfactors);
1386		✗	av_frame_free(&s->window);
1387		✗	av_frame_free(&s->input_in);
1388		✗	av_frame_free(&s->input);
1389		✗	av_frame_free(&s->output);
1390		✗	av_frame_free(&s->output_ph);
1391		✗	av_frame_free(&s->output_mag);
1392		✗	av_frame_free(&s->output_out);
1393		✗	av_frame_free(&s->overlap_buffer);
1394
1395		✗	for (int ch = 0; ch < s->nb_in_channels; ch++)
1396		✗	av_tx_uninit(&s->rdft[ch]);
1397		✗	for (int ch = 0; ch < s->nb_out_channels; ch++)
1398		✗	av_tx_uninit(&s->irdft[ch]);
1399		✗	av_freep(&s->input_levels);
1400		✗	av_freep(&s->output_levels);
1401		✗	av_freep(&s->rdft);
1402		✗	av_freep(&s->irdft);
1403		✗	av_freep(&s->window_func_lut);
1404
1405		✗	av_freep(&s->x_pos);
1406		✗	av_freep(&s->y_pos);
1407		✗	av_freep(&s->l_phase);
1408		✗	av_freep(&s->r_phase);
1409		✗	av_freep(&s->c_mag);
1410		✗	av_freep(&s->c_phase);
1411		✗	av_freep(&s->mag_total);
1412		✗	av_freep(&s->lfe_mag);
1413		✗	av_freep(&s->lfe_phase);
1414		✗	}
1415
1416		✗	static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
1417			char *res, int res_len, int flags)
1418			{
1419		✗	AudioSurroundContext *s = ctx->priv;
1420			int ret;
1421
1422		✗	ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
1423		✗	if (ret < 0)
1424		✗	return ret;
1425
1426		✗	s->hop_size = FFMAX(1, s->win_size * (1. - s->overlap));
1427
1428		✗	allchannels_spread(ctx);
1429		✗	set_input_levels(ctx);
1430		✗	set_output_levels(ctx);
1431
1432		✗	return 0;
1433			}
1434
1435			#define OFFSET(x) offsetof(AudioSurroundContext, x)
1436			#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
1437			#define TFLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
1438
1439			static const AVOption surround_options[] = {
1440			{ "chl_out", "set output channel layout", OFFSET(out_ch_layout), AV_OPT_TYPE_CHLAYOUT, {.str="5.1"}, 0, 0, FLAGS },
1441			{ "chl_in", "set input channel layout", OFFSET(in_ch_layout), AV_OPT_TYPE_CHLAYOUT, {.str="stereo"},0, 0, FLAGS },
1442			{ "level_in", "set input level", OFFSET(level_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1443			{ "level_out", "set output level", OFFSET(level_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1444			{ "lfe", "output LFE", OFFSET(output_lfe), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, TFLAGS },
1445			{ "lfe_low", "LFE low cut off", OFFSET(lowcutf), AV_OPT_TYPE_INT, {.i64=128}, 0, 256, FLAGS },
1446			{ "lfe_high", "LFE high cut off", OFFSET(highcutf), AV_OPT_TYPE_INT, {.i64=256}, 0, 512, FLAGS },
1447			{ "lfe_mode", "set LFE channel mode", OFFSET(lfe_mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, TFLAGS, .unit = "lfe_mode" },
1448			{ "add", "just add LFE channel", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 1, TFLAGS, .unit = "lfe_mode" },
1449			{ "sub", "subtract LFE channel with others", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 1, TFLAGS, .unit = "lfe_mode" },
1450			{ "smooth", "set temporal smoothness strength", OFFSET(smooth), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 1, TFLAGS },
1451			{ "angle", "set soundfield transform angle", OFFSET(angle), AV_OPT_TYPE_FLOAT, {.dbl=90}, 0, 360, TFLAGS },
1452			{ "focus", "set soundfield transform focus", OFFSET(focus), AV_OPT_TYPE_FLOAT, {.dbl=0}, -1, 1, TFLAGS },
1453			{ "fc_in", "set front center channel input level", OFFSET(f_i[SC_FC]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1454			{ "fc_out", "set front center channel output level", OFFSET(f_o[SC_FC]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1455			{ "fl_in", "set front left channel input level", OFFSET(f_i[SC_FL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1456			{ "fl_out", "set front left channel output level", OFFSET(f_o[SC_FL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1457			{ "fr_in", "set front right channel input level", OFFSET(f_i[SC_FR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1458			{ "fr_out", "set front right channel output level", OFFSET(f_o[SC_FR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1459			{ "sl_in", "set side left channel input level", OFFSET(f_i[SC_SL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1460			{ "sl_out", "set side left channel output level", OFFSET(f_o[SC_SL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1461			{ "sr_in", "set side right channel input level", OFFSET(f_i[SC_SR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1462			{ "sr_out", "set side right channel output level", OFFSET(f_o[SC_SR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1463			{ "bl_in", "set back left channel input level", OFFSET(f_i[SC_BL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1464			{ "bl_out", "set back left channel output level", OFFSET(f_o[SC_BL]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1465			{ "br_in", "set back right channel input level", OFFSET(f_i[SC_BR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1466			{ "br_out", "set back right channel output level", OFFSET(f_o[SC_BR]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1467			{ "bc_in", "set back center channel input level", OFFSET(f_i[SC_BC]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1468			{ "bc_out", "set back center channel output level", OFFSET(f_o[SC_BC]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1469			{ "lfe_in", "set lfe channel input level", OFFSET(f_i[SC_LF]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1470			{ "lfe_out", "set lfe channel output level", OFFSET(f_o[SC_LF]), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, TFLAGS },
1471			{ "allx", "set all channel's x spread", OFFSET(all_x), AV_OPT_TYPE_FLOAT, {.dbl=-1}, -1, 15, TFLAGS },
1472			{ "ally", "set all channel's y spread", OFFSET(all_y), AV_OPT_TYPE_FLOAT, {.dbl=-1}, -1, 15, TFLAGS },
1473			{ "fcx", "set front center channel x spread", OFFSET(f_x[SC_FC]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1474			{ "flx", "set front left channel x spread", OFFSET(f_x[SC_FL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1475			{ "frx", "set front right channel x spread", OFFSET(f_x[SC_FR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1476			{ "blx", "set back left channel x spread", OFFSET(f_x[SC_BL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1477			{ "brx", "set back right channel x spread", OFFSET(f_x[SC_BR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1478			{ "slx", "set side left channel x spread", OFFSET(f_x[SC_SL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1479			{ "srx", "set side right channel x spread", OFFSET(f_x[SC_SR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1480			{ "bcx", "set back center channel x spread", OFFSET(f_x[SC_BC]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1481			{ "fcy", "set front center channel y spread", OFFSET(f_y[SC_FC]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1482			{ "fly", "set front left channel y spread", OFFSET(f_y[SC_FL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1483			{ "fry", "set front right channel y spread", OFFSET(f_y[SC_FR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1484			{ "bly", "set back left channel y spread", OFFSET(f_y[SC_BL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1485			{ "bry", "set back right channel y spread", OFFSET(f_y[SC_BR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1486			{ "sly", "set side left channel y spread", OFFSET(f_y[SC_SL]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1487			{ "sry", "set side right channel y spread", OFFSET(f_y[SC_SR]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1488			{ "bcy", "set back center channel y spread", OFFSET(f_y[SC_BC]), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, .06, 15, TFLAGS },
1489			{ "win_size", "set window size", OFFSET(win_size), AV_OPT_TYPE_INT, {.i64=4096},1024,65536,FLAGS },
1490			WIN_FUNC_OPTION("win_func", OFFSET(win_func), FLAGS, WFUNC_HANNING),
1491			{ "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0, 1, TFLAGS },
1492			{ NULL }
1493			};
1494
1495			AVFILTER_DEFINE_CLASS(surround);
1496
1497			static const AVFilterPad inputs[] = {
1498			{
1499			.name = "default",
1500			.type = AVMEDIA_TYPE_AUDIO,
1501			.config_props = config_input,
1502			},
1503			};
1504
1505			static const AVFilterPad outputs[] = {
1506			{
1507			.name = "default",
1508			.type = AVMEDIA_TYPE_AUDIO,
1509			.config_props = config_output,
1510			},
1511			};
1512
1513			const FFFilter ff_af_surround = {
1514			.p.name = "surround",
1515			.p.description = NULL_IF_CONFIG_SMALL("Apply audio surround upmix filter."),
1516			.p.priv_class = &surround_class,
1517			.p.flags = AVFILTER_FLAG_SLICE_THREADS,
1518			.priv_size = sizeof(AudioSurroundContext),
1519			.init = init,
1520			.uninit = uninit,
1521			.activate = activate,
1522			FILTER_INPUTS(inputs),
1523			FILTER_OUTPUTS(outputs),
1524			FILTER_QUERY_FUNC2(query_formats),
1525			.process_command = process_command,
1526			};
1527