2 * Copyright (C) 2017 Paul B Mahol
3 * Copyright (C) 2013-2015 Andreas Fuchs, Wolfgang Hrauda
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "libavutil/avstring.h"
24 #include "libavutil/channel_layout.h"
25 #include "libavutil/float_dsp.h"
26 #include "libavutil/intmath.h"
27 #include "libavutil/opt.h"
28 #include "libavcodec/avfft.h"
36 #define FREQUENCY_DOMAIN 1
41 typedef struct HeadphoneContext {
60 float lfe_gain, gain_lfe;
72 FFTComplex *temp_fft[2];
73 FFTComplex *temp_afft[2];
75 FFTContext *fft[2], *ifft[2];
76 FFTComplex *data_hrtf[2];
78 AVFloatDSPContext *fdsp;
79 struct headphone_inputs {
87 static int parse_channel_name(const char *arg, uint64_t *rchannel)
89 uint64_t layout = av_get_channel_layout(arg);
91 if (av_get_channel_layout_nb_channels(layout) != 1)
92 return AVERROR(EINVAL);
97 static void parse_map(AVFilterContext *ctx)
99 HeadphoneContext *s = ctx->priv;
100 char *arg, *tokenizer, *p;
101 uint64_t used_channels = 0;
106 while ((arg = av_strtok(p, "|", &tokenizer))) {
107 uint64_t out_channel;
110 if (parse_channel_name(arg, &out_channel)) {
111 av_log(ctx, AV_LOG_WARNING, "Failed to parse \'%s\' as channel name.\n", arg);
114 if (used_channels & out_channel) {
115 av_log(ctx, AV_LOG_WARNING, "Ignoring duplicate channel '%s'.\n", arg);
118 used_channels |= out_channel;
119 s->mapping[s->nb_irs] = out_channel;
123 if (s->hrir_fmt == HRIR_MULTI)
126 s->nb_inputs = s->nb_irs + 1;
129 typedef struct ThreadData {
136 FFTComplex **temp_fft;
137 FFTComplex **temp_afft;
140 static int headphone_convolute(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
142 HeadphoneContext *s = ctx->priv;
143 ThreadData *td = arg;
144 AVFrame *in = td->in, *out = td->out;
146 int *write = &td->write[jobnr];
147 const float *const ir = td->ir[jobnr];
148 int *n_clippings = &td->n_clippings[jobnr];
149 float *ringbuffer = td->ringbuffer[jobnr];
150 float *temp_src = td->temp_src[jobnr];
151 const int ir_len = s->ir_len;
152 const int air_len = s->air_len;
153 const float *src = (const float *)in->data[0];
154 float *dst = (float *)out->data[0];
155 const int in_channels = in->channels;
156 const int buffer_length = s->buffer_length;
157 const uint32_t modulo = (uint32_t)buffer_length - 1;
164 for (l = 0; l < in_channels; l++) {
165 buffer[l] = ringbuffer + l * buffer_length;
168 for (i = 0; i < in->nb_samples; i++) {
169 const float *temp_ir = ir;
172 for (l = 0; l < in_channels; l++) {
173 *(buffer[l] + wr) = src[l];
176 for (l = 0; l < in_channels; l++) {
177 const float *const bptr = buffer[l];
179 if (l == s->lfe_channel) {
180 *dst += *(buffer[s->lfe_channel] + wr) * s->gain_lfe;
185 read = (wr - (ir_len - 1) + buffer_length) & modulo;
187 if (read + ir_len < buffer_length) {
188 memcpy(temp_src, bptr + read, ir_len * sizeof(*temp_src));
190 int len = FFMIN(air_len - (read % ir_len), buffer_length - read);
192 memcpy(temp_src, bptr + read, len * sizeof(*temp_src));
193 memcpy(temp_src + len, bptr, (air_len - len) * sizeof(*temp_src));
196 dst[0] += s->fdsp->scalarproduct_float(temp_ir, temp_src, FFALIGN(ir_len, 32));
200 if (fabsf(dst[0]) > 1)
205 wr = (wr + 1) & modulo;
213 static int headphone_fast_convolute(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
215 HeadphoneContext *s = ctx->priv;
216 ThreadData *td = arg;
217 AVFrame *in = td->in, *out = td->out;
219 int *write = &td->write[jobnr];
220 FFTComplex *hrtf = s->data_hrtf[jobnr];
221 int *n_clippings = &td->n_clippings[jobnr];
222 float *ringbuffer = td->ringbuffer[jobnr];
223 const int ir_len = s->ir_len;
224 const float *src = (const float *)in->data[0];
225 float *dst = (float *)out->data[0];
226 const int in_channels = in->channels;
227 const int buffer_length = s->buffer_length;
228 const uint32_t modulo = (uint32_t)buffer_length - 1;
229 FFTComplex *fft_in = s->temp_fft[jobnr];
230 FFTComplex *fft_acc = s->temp_afft[jobnr];
231 FFTContext *ifft = s->ifft[jobnr];
232 FFTContext *fft = s->fft[jobnr];
233 const int n_fft = s->n_fft;
234 const float fft_scale = 1.0f / s->n_fft;
235 FFTComplex *hrtf_offset;
242 n_read = FFMIN(ir_len, in->nb_samples);
243 for (j = 0; j < n_read; j++) {
244 dst[2 * j] = ringbuffer[wr];
245 ringbuffer[wr] = 0.0;
246 wr = (wr + 1) & modulo;
249 for (j = n_read; j < in->nb_samples; j++) {
253 memset(fft_acc, 0, sizeof(FFTComplex) * n_fft);
255 for (i = 0; i < in_channels; i++) {
256 if (i == s->lfe_channel) {
257 for (j = 0; j < in->nb_samples; j++) {
258 dst[2 * j] += src[i + j * in_channels] * s->gain_lfe;
264 hrtf_offset = hrtf + offset;
266 memset(fft_in, 0, sizeof(FFTComplex) * n_fft);
268 for (j = 0; j < in->nb_samples; j++) {
269 fft_in[j].re = src[j * in_channels + i];
272 av_fft_permute(fft, fft_in);
273 av_fft_calc(fft, fft_in);
274 for (j = 0; j < n_fft; j++) {
275 const FFTComplex *hcomplex = hrtf_offset + j;
276 const float re = fft_in[j].re;
277 const float im = fft_in[j].im;
279 fft_acc[j].re += re * hcomplex->re - im * hcomplex->im;
280 fft_acc[j].im += re * hcomplex->im + im * hcomplex->re;
284 av_fft_permute(ifft, fft_acc);
285 av_fft_calc(ifft, fft_acc);
287 for (j = 0; j < in->nb_samples; j++) {
288 dst[2 * j] += fft_acc[j].re * fft_scale;
291 for (j = 0; j < ir_len - 1; j++) {
292 int write_pos = (wr + j) & modulo;
294 *(ringbuffer + write_pos) += fft_acc[in->nb_samples + j].re * fft_scale;
297 for (i = 0; i < out->nb_samples; i++) {
298 if (fabsf(dst[0]) > 1) {
310 static int check_ir(AVFilterLink *inlink, int input_number)
312 AVFilterContext *ctx = inlink->dst;
313 HeadphoneContext *s = ctx->priv;
314 int ir_len, max_ir_len;
316 ir_len = ff_inlink_queued_samples(inlink);
318 if (ir_len > max_ir_len) {
319 av_log(ctx, AV_LOG_ERROR, "Too big length of IRs: %d > %d.\n", ir_len, max_ir_len);
320 return AVERROR(EINVAL);
322 s->in[input_number].ir_len = ir_len;
323 s->ir_len = FFMAX(ir_len, s->ir_len);
328 static int headphone_frame(HeadphoneContext *s, AVFrame *in, AVFilterLink *outlink)
330 AVFilterContext *ctx = outlink->src;
331 int n_clippings[2] = { 0 };
335 out = ff_get_audio_buffer(outlink, in->nb_samples);
338 return AVERROR(ENOMEM);
342 td.in = in; td.out = out; td.write = s->write;
343 td.ir = s->data_ir; td.n_clippings = n_clippings;
344 td.ringbuffer = s->ringbuffer; td.temp_src = s->temp_src;
345 td.temp_fft = s->temp_fft;
346 td.temp_afft = s->temp_afft;
348 if (s->type == TIME_DOMAIN) {
349 ctx->internal->execute(ctx, headphone_convolute, &td, NULL, 2);
351 ctx->internal->execute(ctx, headphone_fast_convolute, &td, NULL, 2);
355 if (n_clippings[0] + n_clippings[1] > 0) {
356 av_log(ctx, AV_LOG_WARNING, "%d of %d samples clipped. Please reduce gain.\n",
357 n_clippings[0] + n_clippings[1], out->nb_samples * 2);
361 return ff_filter_frame(outlink, out);
364 static int convert_coeffs(AVFilterContext *ctx, AVFilterLink *inlink)
366 struct HeadphoneContext *s = ctx->priv;
367 const int ir_len = s->ir_len;
368 int nb_input_channels = ctx->inputs[0]->channels;
369 float gain_lin = expf((s->gain - 3 * nb_input_channels) / 20 * M_LN10);
370 FFTComplex *fft_in_l = NULL;
371 FFTComplex *fft_in_r = NULL;
372 int offset = 0, ret = 0;
376 s->air_len = 1 << (32 - ff_clz(ir_len));
377 if (s->type == TIME_DOMAIN) {
378 s->air_len = FFALIGN(s->air_len, 32);
380 s->buffer_length = 1 << (32 - ff_clz(s->air_len));
381 s->n_fft = n_fft = 1 << (32 - ff_clz(ir_len + s->size));
383 if (s->type == FREQUENCY_DOMAIN) {
384 fft_in_l = av_calloc(n_fft, sizeof(*fft_in_l));
385 fft_in_r = av_calloc(n_fft, sizeof(*fft_in_r));
386 if (!fft_in_l || !fft_in_r) {
387 ret = AVERROR(ENOMEM);
391 s->fft[0] = av_fft_init(av_log2(s->n_fft), 0);
392 s->fft[1] = av_fft_init(av_log2(s->n_fft), 0);
393 s->ifft[0] = av_fft_init(av_log2(s->n_fft), 1);
394 s->ifft[1] = av_fft_init(av_log2(s->n_fft), 1);
396 if (!s->fft[0] || !s->fft[1] || !s->ifft[0] || !s->ifft[1]) {
397 av_log(ctx, AV_LOG_ERROR, "Unable to create FFT contexts of size %d.\n", s->n_fft);
398 ret = AVERROR(ENOMEM);
403 if (s->type == TIME_DOMAIN) {
404 s->ringbuffer[0] = av_calloc(s->buffer_length, sizeof(float) * nb_input_channels);
405 s->ringbuffer[1] = av_calloc(s->buffer_length, sizeof(float) * nb_input_channels);
407 s->ringbuffer[0] = av_calloc(s->buffer_length, sizeof(float));
408 s->ringbuffer[1] = av_calloc(s->buffer_length, sizeof(float));
409 s->temp_fft[0] = av_calloc(s->n_fft, sizeof(FFTComplex));
410 s->temp_fft[1] = av_calloc(s->n_fft, sizeof(FFTComplex));
411 s->temp_afft[0] = av_calloc(s->n_fft, sizeof(FFTComplex));
412 s->temp_afft[1] = av_calloc(s->n_fft, sizeof(FFTComplex));
413 if (!s->temp_fft[0] || !s->temp_fft[1] ||
414 !s->temp_afft[0] || !s->temp_afft[1]) {
415 ret = AVERROR(ENOMEM);
420 if (!s->ringbuffer[0] || !s->ringbuffer[1]) {
421 ret = AVERROR(ENOMEM);
425 if (s->type == TIME_DOMAIN) {
426 s->temp_src[0] = av_calloc(s->air_len, sizeof(float));
427 s->temp_src[1] = av_calloc(s->air_len, sizeof(float));
429 s->data_ir[0] = av_calloc(nb_input_channels * s->air_len, sizeof(*s->data_ir[0]));
430 s->data_ir[1] = av_calloc(nb_input_channels * s->air_len, sizeof(*s->data_ir[1]));
431 if (!s->data_ir[0] || !s->data_ir[1] || !s->temp_src[0] || !s->temp_src[1]) {
432 ret = AVERROR(ENOMEM);
436 s->data_hrtf[0] = av_calloc(n_fft, sizeof(*s->data_hrtf[0]) * nb_input_channels);
437 s->data_hrtf[1] = av_calloc(n_fft, sizeof(*s->data_hrtf[1]) * nb_input_channels);
438 if (!s->data_hrtf[0] || !s->data_hrtf[1]) {
439 ret = AVERROR(ENOMEM);
444 for (i = 0; i < s->nb_inputs - 1; i++) {
445 int len = s->in[i + 1].ir_len;
448 ret = ff_inlink_consume_samples(ctx->inputs[i + 1], len, len, &s->in[i + 1].frame);
451 ptr = (float *)s->in[i + 1].frame->extended_data[0];
453 if (s->hrir_fmt == HRIR_STEREO) {
454 int idx = av_get_channel_layout_channel_index(inlink->channel_layout,
458 if (s->type == TIME_DOMAIN) {
459 float *data_ir_l = s->data_ir[0] + idx * s->air_len;
460 float *data_ir_r = s->data_ir[1] + idx * s->air_len;
462 for (j = 0; j < len; j++) {
463 data_ir_l[j] = ptr[len * 2 - j * 2 - 2] * gain_lin;
464 data_ir_r[j] = ptr[len * 2 - j * 2 - 1] * gain_lin;
467 memset(fft_in_l, 0, n_fft * sizeof(*fft_in_l));
468 memset(fft_in_r, 0, n_fft * sizeof(*fft_in_r));
470 offset = idx * n_fft;
471 for (j = 0; j < len; j++) {
472 fft_in_l[j].re = ptr[j * 2 ] * gain_lin;
473 fft_in_r[j].re = ptr[j * 2 + 1] * gain_lin;
476 av_fft_permute(s->fft[0], fft_in_l);
477 av_fft_calc(s->fft[0], fft_in_l);
478 memcpy(s->data_hrtf[0] + offset, fft_in_l, n_fft * sizeof(*fft_in_l));
479 av_fft_permute(s->fft[0], fft_in_r);
480 av_fft_calc(s->fft[0], fft_in_r);
481 memcpy(s->data_hrtf[1] + offset, fft_in_r, n_fft * sizeof(*fft_in_r));
484 int I, N = ctx->inputs[1]->channels;
486 for (k = 0; k < N / 2; k++) {
487 int idx = av_get_channel_layout_channel_index(inlink->channel_layout,
493 if (s->type == TIME_DOMAIN) {
494 float *data_ir_l = s->data_ir[0] + idx * s->air_len;
495 float *data_ir_r = s->data_ir[1] + idx * s->air_len;
497 for (j = 0; j < len; j++) {
498 data_ir_l[j] = ptr[len * N - j * N - N + I ] * gain_lin;
499 data_ir_r[j] = ptr[len * N - j * N - N + I + 1] * gain_lin;
502 memset(fft_in_l, 0, n_fft * sizeof(*fft_in_l));
503 memset(fft_in_r, 0, n_fft * sizeof(*fft_in_r));
505 offset = idx * n_fft;
506 for (j = 0; j < len; j++) {
507 fft_in_l[j].re = ptr[j * N + I ] * gain_lin;
508 fft_in_r[j].re = ptr[j * N + I + 1] * gain_lin;
511 av_fft_permute(s->fft[0], fft_in_l);
512 av_fft_calc(s->fft[0], fft_in_l);
513 memcpy(s->data_hrtf[0] + offset, fft_in_l, n_fft * sizeof(*fft_in_l));
514 av_fft_permute(s->fft[0], fft_in_r);
515 av_fft_calc(s->fft[0], fft_in_r);
516 memcpy(s->data_hrtf[1] + offset, fft_in_r, n_fft * sizeof(*fft_in_r));
521 av_frame_free(&s->in[i + 1].frame);
528 for (i = 0; i < s->nb_inputs - 1; i++)
529 av_frame_free(&s->in[i + 1].frame);
537 static int activate(AVFilterContext *ctx)
539 HeadphoneContext *s = ctx->priv;
540 AVFilterLink *inlink = ctx->inputs[0];
541 AVFilterLink *outlink = ctx->outputs[0];
545 FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx);
548 for (i = 1; i < s->nb_inputs; i++) {
552 if ((ret = check_ir(ctx->inputs[i], i)) < 0)
555 if (ff_outlink_get_status(ctx->inputs[i]) == AVERROR_EOF) {
556 if (!ff_inlink_queued_samples(ctx->inputs[i])) {
557 av_log(ctx, AV_LOG_ERROR, "No samples provided for "
558 "HRIR stream %d.\n", i - 1);
559 return AVERROR_INVALIDDATA;
563 if (ff_outlink_frame_wanted(ctx->outputs[0]))
564 ff_inlink_request_frame(ctx->inputs[i]);
572 ret = convert_coeffs(ctx, inlink);
575 } else if (!s->have_hrirs)
578 if ((ret = ff_inlink_consume_samples(ctx->inputs[0], s->size, s->size, &in)) > 0) {
579 ret = headphone_frame(s, in, outlink);
587 FF_FILTER_FORWARD_STATUS(ctx->inputs[0], ctx->outputs[0]);
588 if (ff_outlink_frame_wanted(ctx->outputs[0]))
589 ff_inlink_request_frame(ctx->inputs[0]);
594 static int query_formats(AVFilterContext *ctx)
596 struct HeadphoneContext *s = ctx->priv;
597 AVFilterFormats *formats = NULL;
598 AVFilterChannelLayouts *layouts = NULL;
599 AVFilterChannelLayouts *stereo_layout = NULL;
600 AVFilterChannelLayouts *hrir_layouts = NULL;
603 ret = ff_add_format(&formats, AV_SAMPLE_FMT_FLT);
606 ret = ff_set_common_formats(ctx, formats);
610 layouts = ff_all_channel_layouts();
612 return AVERROR(ENOMEM);
614 ret = ff_channel_layouts_ref(layouts, &ctx->inputs[0]->outcfg.channel_layouts);
618 ret = ff_add_channel_layout(&stereo_layout, AV_CH_LAYOUT_STEREO);
621 ret = ff_channel_layouts_ref(stereo_layout, &ctx->outputs[0]->incfg.channel_layouts);
625 if (s->hrir_fmt == HRIR_MULTI) {
626 hrir_layouts = ff_all_channel_counts();
628 return AVERROR(ENOMEM);
629 ret = ff_channel_layouts_ref(hrir_layouts, &ctx->inputs[1]->outcfg.channel_layouts);
633 for (i = 1; i < s->nb_inputs; i++) {
634 ret = ff_channel_layouts_ref(stereo_layout, &ctx->inputs[i]->outcfg.channel_layouts);
640 formats = ff_all_samplerates();
642 return AVERROR(ENOMEM);
643 return ff_set_common_samplerates(ctx, formats);
646 static int config_input(AVFilterLink *inlink)
648 AVFilterContext *ctx = inlink->dst;
649 HeadphoneContext *s = ctx->priv;
651 if (s->nb_irs < inlink->channels) {
652 av_log(ctx, AV_LOG_ERROR, "Number of HRIRs must be >= %d.\n", inlink->channels);
653 return AVERROR(EINVAL);
656 s->lfe_channel = av_get_channel_layout_channel_index(inlink->channel_layout,
657 AV_CH_LOW_FREQUENCY);
661 static av_cold int init(AVFilterContext *ctx)
663 HeadphoneContext *s = ctx->priv;
668 .type = AVMEDIA_TYPE_AUDIO,
669 .config_props = config_input,
671 if ((ret = ff_insert_inpad(ctx, 0, &pad)) < 0)
675 av_log(ctx, AV_LOG_ERROR, "Valid mapping must be set.\n");
676 return AVERROR(EINVAL);
681 s->in = av_calloc(s->nb_inputs, sizeof(*s->in));
683 return AVERROR(ENOMEM);
685 for (i = 1; i < s->nb_inputs; i++) {
686 char *name = av_asprintf("hrir%d", i - 1);
689 .type = AVMEDIA_TYPE_AUDIO,
692 return AVERROR(ENOMEM);
693 if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
699 s->fdsp = avpriv_float_dsp_alloc(0);
701 return AVERROR(ENOMEM);
706 static int config_output(AVFilterLink *outlink)
708 AVFilterContext *ctx = outlink->src;
709 HeadphoneContext *s = ctx->priv;
710 AVFilterLink *inlink = ctx->inputs[0];
712 if (s->hrir_fmt == HRIR_MULTI) {
713 AVFilterLink *hrir_link = ctx->inputs[1];
715 if (hrir_link->channels < inlink->channels * 2) {
716 av_log(ctx, AV_LOG_ERROR, "Number of channels in HRIR stream must be >= %d.\n", inlink->channels * 2);
717 return AVERROR(EINVAL);
721 s->gain_lfe = expf((s->gain - 3 * inlink->channels + s->lfe_gain) / 20 * M_LN10);
726 static av_cold void uninit(AVFilterContext *ctx)
728 HeadphoneContext *s = ctx->priv;
730 av_fft_end(s->ifft[0]);
731 av_fft_end(s->ifft[1]);
732 av_fft_end(s->fft[0]);
733 av_fft_end(s->fft[1]);
734 av_freep(&s->data_ir[0]);
735 av_freep(&s->data_ir[1]);
736 av_freep(&s->ringbuffer[0]);
737 av_freep(&s->ringbuffer[1]);
738 av_freep(&s->temp_src[0]);
739 av_freep(&s->temp_src[1]);
740 av_freep(&s->temp_fft[0]);
741 av_freep(&s->temp_fft[1]);
742 av_freep(&s->temp_afft[0]);
743 av_freep(&s->temp_afft[1]);
744 av_freep(&s->data_hrtf[0]);
745 av_freep(&s->data_hrtf[1]);
749 for (unsigned i = 1; i < ctx->nb_inputs; i++)
750 av_freep(&ctx->input_pads[i].name);
753 #define OFFSET(x) offsetof(HeadphoneContext, x)
754 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
756 static const AVOption headphone_options[] = {
757 { "map", "set channels convolution mappings", OFFSET(map), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
758 { "gain", "set gain in dB", OFFSET(gain), AV_OPT_TYPE_FLOAT, {.dbl=0}, -20, 40, .flags = FLAGS },
759 { "lfe", "set lfe gain in dB", OFFSET(lfe_gain), AV_OPT_TYPE_FLOAT, {.dbl=0}, -20, 40, .flags = FLAGS },
760 { "type", "set processing", OFFSET(type), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, .flags = FLAGS, "type" },
761 { "time", "time domain", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, .flags = FLAGS, "type" },
762 { "freq", "frequency domain", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, .flags = FLAGS, "type" },
763 { "size", "set frame size", OFFSET(size), AV_OPT_TYPE_INT, {.i64=1024},1024,96000, .flags = FLAGS },
764 { "hrir", "set hrir format", OFFSET(hrir_fmt), AV_OPT_TYPE_INT, {.i64=HRIR_STEREO}, 0, 1, .flags = FLAGS, "hrir" },
765 { "stereo", "hrir files have exactly 2 channels", 0, AV_OPT_TYPE_CONST, {.i64=HRIR_STEREO}, 0, 0, .flags = FLAGS, "hrir" },
766 { "multich", "single multichannel hrir file", 0, AV_OPT_TYPE_CONST, {.i64=HRIR_MULTI}, 0, 0, .flags = FLAGS, "hrir" },
770 AVFILTER_DEFINE_CLASS(headphone);
772 static const AVFilterPad outputs[] = {
775 .type = AVMEDIA_TYPE_AUDIO,
776 .config_props = config_output,
781 AVFilter ff_af_headphone = {
783 .description = NULL_IF_CONFIG_SMALL("Apply headphone binaural spatialization with HRTFs in additional streams."),
784 .priv_size = sizeof(HeadphoneContext),
785 .priv_class = &headphone_class,
788 .query_formats = query_formats,
789 .activate = activate,
792 .flags = AVFILTER_FLAG_SLICE_THREADS | AVFILTER_FLAG_DYNAMIC_INPUTS,