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;
107 while ((arg = av_strtok(p, "|", &tokenizer))) {
108 uint64_t out_channel;
111 if (parse_channel_name(arg, &out_channel)) {
112 av_log(ctx, AV_LOG_WARNING, "Failed to parse \'%s\' as channel name.\n", arg);
115 if (used_channels & out_channel) {
116 av_log(ctx, AV_LOG_WARNING, "Ignoring duplicate channel '%s'.\n", arg);
119 used_channels |= out_channel;
120 s->mapping[s->nb_irs] = out_channel;
124 if (s->hrir_fmt == HRIR_MULTI)
127 s->nb_inputs = s->nb_irs + 1;
130 typedef struct ThreadData {
137 FFTComplex **temp_fft;
138 FFTComplex **temp_afft;
141 static int headphone_convolute(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
143 HeadphoneContext *s = ctx->priv;
144 ThreadData *td = arg;
145 AVFrame *in = td->in, *out = td->out;
147 int *write = &td->write[jobnr];
148 const float *const ir = td->ir[jobnr];
149 int *n_clippings = &td->n_clippings[jobnr];
150 float *ringbuffer = td->ringbuffer[jobnr];
151 float *temp_src = td->temp_src[jobnr];
152 const int ir_len = s->ir_len;
153 const int air_len = s->air_len;
154 const float *src = (const float *)in->data[0];
155 float *dst = (float *)out->data[0];
156 const int in_channels = in->channels;
157 const int buffer_length = s->buffer_length;
158 const uint32_t modulo = (uint32_t)buffer_length - 1;
165 for (l = 0; l < in_channels; l++) {
166 buffer[l] = ringbuffer + l * buffer_length;
169 for (i = 0; i < in->nb_samples; i++) {
170 const float *temp_ir = ir;
173 for (l = 0; l < in_channels; l++) {
174 *(buffer[l] + wr) = src[l];
177 for (l = 0; l < in_channels; l++) {
178 const float *const bptr = buffer[l];
180 if (l == s->lfe_channel) {
181 *dst += *(buffer[s->lfe_channel] + wr) * s->gain_lfe;
186 read = (wr - (ir_len - 1) + buffer_length) & modulo;
188 if (read + ir_len < buffer_length) {
189 memcpy(temp_src, bptr + read, ir_len * sizeof(*temp_src));
191 int len = FFMIN(air_len - (read % ir_len), buffer_length - read);
193 memcpy(temp_src, bptr + read, len * sizeof(*temp_src));
194 memcpy(temp_src + len, bptr, (air_len - len) * sizeof(*temp_src));
197 dst[0] += s->fdsp->scalarproduct_float(temp_ir, temp_src, FFALIGN(ir_len, 32));
201 if (fabsf(dst[0]) > 1)
206 wr = (wr + 1) & modulo;
214 static int headphone_fast_convolute(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
216 HeadphoneContext *s = ctx->priv;
217 ThreadData *td = arg;
218 AVFrame *in = td->in, *out = td->out;
220 int *write = &td->write[jobnr];
221 FFTComplex *hrtf = s->data_hrtf[jobnr];
222 int *n_clippings = &td->n_clippings[jobnr];
223 float *ringbuffer = td->ringbuffer[jobnr];
224 const int ir_len = s->ir_len;
225 const float *src = (const float *)in->data[0];
226 float *dst = (float *)out->data[0];
227 const int in_channels = in->channels;
228 const int buffer_length = s->buffer_length;
229 const uint32_t modulo = (uint32_t)buffer_length - 1;
230 FFTComplex *fft_in = s->temp_fft[jobnr];
231 FFTComplex *fft_acc = s->temp_afft[jobnr];
232 FFTContext *ifft = s->ifft[jobnr];
233 FFTContext *fft = s->fft[jobnr];
234 const int n_fft = s->n_fft;
235 const float fft_scale = 1.0f / s->n_fft;
236 FFTComplex *hrtf_offset;
243 n_read = FFMIN(ir_len, in->nb_samples);
244 for (j = 0; j < n_read; j++) {
245 dst[2 * j] = ringbuffer[wr];
246 ringbuffer[wr] = 0.0;
247 wr = (wr + 1) & modulo;
250 for (j = n_read; j < in->nb_samples; j++) {
254 memset(fft_acc, 0, sizeof(FFTComplex) * n_fft);
256 for (i = 0; i < in_channels; i++) {
257 if (i == s->lfe_channel) {
258 for (j = 0; j < in->nb_samples; j++) {
259 dst[2 * j] += src[i + j * in_channels] * s->gain_lfe;
265 hrtf_offset = hrtf + offset;
267 memset(fft_in, 0, sizeof(FFTComplex) * n_fft);
269 for (j = 0; j < in->nb_samples; j++) {
270 fft_in[j].re = src[j * in_channels + i];
273 av_fft_permute(fft, fft_in);
274 av_fft_calc(fft, fft_in);
275 for (j = 0; j < n_fft; j++) {
276 const FFTComplex *hcomplex = hrtf_offset + j;
277 const float re = fft_in[j].re;
278 const float im = fft_in[j].im;
280 fft_acc[j].re += re * hcomplex->re - im * hcomplex->im;
281 fft_acc[j].im += re * hcomplex->im + im * hcomplex->re;
285 av_fft_permute(ifft, fft_acc);
286 av_fft_calc(ifft, fft_acc);
288 for (j = 0; j < in->nb_samples; j++) {
289 dst[2 * j] += fft_acc[j].re * fft_scale;
292 for (j = 0; j < ir_len - 1; j++) {
293 int write_pos = (wr + j) & modulo;
295 *(ringbuffer + write_pos) += fft_acc[in->nb_samples + j].re * fft_scale;
298 for (i = 0; i < out->nb_samples; i++) {
299 if (fabsf(dst[0]) > 1) {
311 static int check_ir(AVFilterLink *inlink, int input_number)
313 AVFilterContext *ctx = inlink->dst;
314 HeadphoneContext *s = ctx->priv;
315 int ir_len, max_ir_len;
317 ir_len = ff_inlink_queued_samples(inlink);
319 if (ir_len > max_ir_len) {
320 av_log(ctx, AV_LOG_ERROR, "Too big length of IRs: %d > %d.\n", ir_len, max_ir_len);
321 return AVERROR(EINVAL);
323 s->in[input_number].ir_len = ir_len;
324 s->ir_len = FFMAX(ir_len, s->ir_len);
329 static int headphone_frame(HeadphoneContext *s, AVFrame *in, AVFilterLink *outlink)
331 AVFilterContext *ctx = outlink->src;
332 int n_clippings[2] = { 0 };
336 out = ff_get_audio_buffer(outlink, in->nb_samples);
339 return AVERROR(ENOMEM);
343 td.in = in; td.out = out; td.write = s->write;
344 td.ir = s->data_ir; td.n_clippings = n_clippings;
345 td.ringbuffer = s->ringbuffer; td.temp_src = s->temp_src;
346 td.temp_fft = s->temp_fft;
347 td.temp_afft = s->temp_afft;
349 if (s->type == TIME_DOMAIN) {
350 ctx->internal->execute(ctx, headphone_convolute, &td, NULL, 2);
352 ctx->internal->execute(ctx, headphone_fast_convolute, &td, NULL, 2);
356 if (n_clippings[0] + n_clippings[1] > 0) {
357 av_log(ctx, AV_LOG_WARNING, "%d of %d samples clipped. Please reduce gain.\n",
358 n_clippings[0] + n_clippings[1], out->nb_samples * 2);
362 return ff_filter_frame(outlink, out);
365 static int convert_coeffs(AVFilterContext *ctx, AVFilterLink *inlink)
367 struct HeadphoneContext *s = ctx->priv;
368 const int ir_len = s->ir_len;
369 int nb_input_channels = ctx->inputs[0]->channels;
370 float gain_lin = expf((s->gain - 3 * nb_input_channels) / 20 * M_LN10);
371 FFTComplex *fft_in_l = NULL;
372 FFTComplex *fft_in_r = NULL;
373 int offset = 0, ret = 0;
377 s->air_len = 1 << (32 - ff_clz(ir_len));
378 if (s->type == TIME_DOMAIN) {
379 s->air_len = FFALIGN(s->air_len, 32);
381 s->buffer_length = 1 << (32 - ff_clz(s->air_len));
382 s->n_fft = n_fft = 1 << (32 - ff_clz(ir_len + s->size));
384 if (s->type == FREQUENCY_DOMAIN) {
385 fft_in_l = av_calloc(n_fft, sizeof(*fft_in_l));
386 fft_in_r = av_calloc(n_fft, sizeof(*fft_in_r));
387 if (!fft_in_l || !fft_in_r) {
388 ret = AVERROR(ENOMEM);
392 s->fft[0] = av_fft_init(av_log2(s->n_fft), 0);
393 s->fft[1] = av_fft_init(av_log2(s->n_fft), 0);
394 s->ifft[0] = av_fft_init(av_log2(s->n_fft), 1);
395 s->ifft[1] = av_fft_init(av_log2(s->n_fft), 1);
397 if (!s->fft[0] || !s->fft[1] || !s->ifft[0] || !s->ifft[1]) {
398 av_log(ctx, AV_LOG_ERROR, "Unable to create FFT contexts of size %d.\n", s->n_fft);
399 ret = AVERROR(ENOMEM);
404 if (s->type == TIME_DOMAIN) {
405 s->ringbuffer[0] = av_calloc(s->buffer_length, sizeof(float) * nb_input_channels);
406 s->ringbuffer[1] = av_calloc(s->buffer_length, sizeof(float) * nb_input_channels);
408 s->ringbuffer[0] = av_calloc(s->buffer_length, sizeof(float));
409 s->ringbuffer[1] = av_calloc(s->buffer_length, sizeof(float));
410 s->temp_fft[0] = av_calloc(s->n_fft, sizeof(FFTComplex));
411 s->temp_fft[1] = av_calloc(s->n_fft, sizeof(FFTComplex));
412 s->temp_afft[0] = av_calloc(s->n_fft, sizeof(FFTComplex));
413 s->temp_afft[1] = av_calloc(s->n_fft, sizeof(FFTComplex));
414 if (!s->temp_fft[0] || !s->temp_fft[1] ||
415 !s->temp_afft[0] || !s->temp_afft[1]) {
416 ret = AVERROR(ENOMEM);
421 if (!s->ringbuffer[0] || !s->ringbuffer[1]) {
422 ret = AVERROR(ENOMEM);
426 if (s->type == TIME_DOMAIN) {
427 s->temp_src[0] = av_calloc(s->air_len, sizeof(float));
428 s->temp_src[1] = av_calloc(s->air_len, sizeof(float));
430 s->data_ir[0] = av_calloc(nb_input_channels * s->air_len, sizeof(*s->data_ir[0]));
431 s->data_ir[1] = av_calloc(nb_input_channels * s->air_len, sizeof(*s->data_ir[1]));
432 if (!s->data_ir[0] || !s->data_ir[1] || !s->temp_src[0] || !s->temp_src[1]) {
433 ret = AVERROR(ENOMEM);
437 s->data_hrtf[0] = av_calloc(n_fft, sizeof(*s->data_hrtf[0]) * nb_input_channels);
438 s->data_hrtf[1] = av_calloc(n_fft, sizeof(*s->data_hrtf[1]) * nb_input_channels);
439 if (!s->data_hrtf[0] || !s->data_hrtf[1]) {
440 ret = AVERROR(ENOMEM);
445 for (i = 0; i < s->nb_inputs - 1; i++) {
446 int len = s->in[i + 1].ir_len;
449 ret = ff_inlink_consume_samples(ctx->inputs[i + 1], len, len, &s->in[i + 1].frame);
452 ptr = (float *)s->in[i + 1].frame->extended_data[0];
454 if (s->hrir_fmt == HRIR_STEREO) {
457 for (j = 0; j < inlink->channels; j++) {
458 if ((av_channel_layout_extract_channel(inlink->channel_layout, j)) == s->mapping[i]) {
460 if (s->mapping[i] == AV_CH_LOW_FREQUENCY)
468 if (s->type == TIME_DOMAIN) {
469 float *data_ir_l = s->data_ir[0] + idx * s->air_len;
470 float *data_ir_r = s->data_ir[1] + idx * s->air_len;
472 for (j = 0; j < len; j++) {
473 data_ir_l[j] = ptr[len * 2 - j * 2 - 2] * gain_lin;
474 data_ir_r[j] = ptr[len * 2 - j * 2 - 1] * gain_lin;
477 memset(fft_in_l, 0, n_fft * sizeof(*fft_in_l));
478 memset(fft_in_r, 0, n_fft * sizeof(*fft_in_r));
480 offset = idx * n_fft;
481 for (j = 0; j < len; j++) {
482 fft_in_l[j].re = ptr[j * 2 ] * gain_lin;
483 fft_in_r[j].re = ptr[j * 2 + 1] * gain_lin;
486 av_fft_permute(s->fft[0], fft_in_l);
487 av_fft_calc(s->fft[0], fft_in_l);
488 memcpy(s->data_hrtf[0] + offset, fft_in_l, n_fft * sizeof(*fft_in_l));
489 av_fft_permute(s->fft[0], fft_in_r);
490 av_fft_calc(s->fft[0], fft_in_r);
491 memcpy(s->data_hrtf[1] + offset, fft_in_r, n_fft * sizeof(*fft_in_r));
494 int I, N = ctx->inputs[1]->channels;
496 for (k = 0; k < N / 2; k++) {
499 for (j = 0; j < inlink->channels; j++) {
500 if ((av_channel_layout_extract_channel(inlink->channel_layout, j)) == s->mapping[k]) {
502 if (s->mapping[k] == AV_CH_LOW_FREQUENCY)
511 if (s->type == TIME_DOMAIN) {
512 float *data_ir_l = s->data_ir[0] + idx * s->air_len;
513 float *data_ir_r = s->data_ir[1] + idx * s->air_len;
515 for (j = 0; j < len; j++) {
516 data_ir_l[j] = ptr[len * N - j * N - N + I ] * gain_lin;
517 data_ir_r[j] = ptr[len * N - j * N - N + I + 1] * gain_lin;
520 memset(fft_in_l, 0, n_fft * sizeof(*fft_in_l));
521 memset(fft_in_r, 0, n_fft * sizeof(*fft_in_r));
523 offset = idx * n_fft;
524 for (j = 0; j < len; j++) {
525 fft_in_l[j].re = ptr[j * N + I ] * gain_lin;
526 fft_in_r[j].re = ptr[j * N + I + 1] * gain_lin;
529 av_fft_permute(s->fft[0], fft_in_l);
530 av_fft_calc(s->fft[0], fft_in_l);
531 memcpy(s->data_hrtf[0] + offset, fft_in_l, n_fft * sizeof(*fft_in_l));
532 av_fft_permute(s->fft[0], fft_in_r);
533 av_fft_calc(s->fft[0], fft_in_r);
534 memcpy(s->data_hrtf[1] + offset, fft_in_r, n_fft * sizeof(*fft_in_r));
539 av_frame_free(&s->in[i + 1].frame);
546 for (i = 0; i < s->nb_inputs - 1; i++)
547 av_frame_free(&s->in[i + 1].frame);
555 static int activate(AVFilterContext *ctx)
557 HeadphoneContext *s = ctx->priv;
558 AVFilterLink *inlink = ctx->inputs[0];
559 AVFilterLink *outlink = ctx->outputs[0];
563 FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx);
566 for (i = 1; i < s->nb_inputs; i++) {
570 if ((ret = check_ir(ctx->inputs[i], i)) < 0)
573 if (ff_outlink_get_status(ctx->inputs[i]) == AVERROR_EOF) {
574 if (!ff_inlink_queued_samples(ctx->inputs[i])) {
575 av_log(ctx, AV_LOG_ERROR, "No samples provided for "
576 "HRIR stream %d.\n", i - 1);
577 return AVERROR_INVALIDDATA;
581 if (ff_outlink_frame_wanted(ctx->outputs[0]))
582 ff_inlink_request_frame(ctx->inputs[i]);
590 ret = convert_coeffs(ctx, inlink);
593 } else if (!s->have_hrirs)
596 if ((ret = ff_inlink_consume_samples(ctx->inputs[0], s->size, s->size, &in)) > 0) {
597 ret = headphone_frame(s, in, outlink);
605 FF_FILTER_FORWARD_STATUS(ctx->inputs[0], ctx->outputs[0]);
606 if (ff_outlink_frame_wanted(ctx->outputs[0]))
607 ff_inlink_request_frame(ctx->inputs[0]);
612 static int query_formats(AVFilterContext *ctx)
614 struct HeadphoneContext *s = ctx->priv;
615 AVFilterFormats *formats = NULL;
616 AVFilterChannelLayouts *layouts = NULL;
617 AVFilterChannelLayouts *stereo_layout = NULL;
618 AVFilterChannelLayouts *hrir_layouts = NULL;
621 ret = ff_add_format(&formats, AV_SAMPLE_FMT_FLT);
624 ret = ff_set_common_formats(ctx, formats);
628 layouts = ff_all_channel_layouts();
630 return AVERROR(ENOMEM);
632 ret = ff_channel_layouts_ref(layouts, &ctx->inputs[0]->outcfg.channel_layouts);
636 ret = ff_add_channel_layout(&stereo_layout, AV_CH_LAYOUT_STEREO);
639 ret = ff_channel_layouts_ref(stereo_layout, &ctx->outputs[0]->incfg.channel_layouts);
643 if (s->hrir_fmt == HRIR_MULTI) {
644 hrir_layouts = ff_all_channel_counts();
646 return AVERROR(ENOMEM);
647 ret = ff_channel_layouts_ref(hrir_layouts, &ctx->inputs[1]->outcfg.channel_layouts);
651 for (i = 1; i < s->nb_inputs; i++) {
652 ret = ff_channel_layouts_ref(stereo_layout, &ctx->inputs[i]->outcfg.channel_layouts);
658 formats = ff_all_samplerates();
660 return AVERROR(ENOMEM);
661 return ff_set_common_samplerates(ctx, formats);
664 static int config_input(AVFilterLink *inlink)
666 AVFilterContext *ctx = inlink->dst;
667 HeadphoneContext *s = ctx->priv;
669 if (s->nb_irs < inlink->channels) {
670 av_log(ctx, AV_LOG_ERROR, "Number of HRIRs must be >= %d.\n", inlink->channels);
671 return AVERROR(EINVAL);
677 static av_cold int init(AVFilterContext *ctx)
679 HeadphoneContext *s = ctx->priv;
684 .type = AVMEDIA_TYPE_AUDIO,
685 .config_props = config_input,
687 if ((ret = ff_insert_inpad(ctx, 0, &pad)) < 0)
691 av_log(ctx, AV_LOG_ERROR, "Valid mapping must be set.\n");
692 return AVERROR(EINVAL);
697 s->in = av_calloc(s->nb_inputs, sizeof(*s->in));
699 return AVERROR(ENOMEM);
701 for (i = 1; i < s->nb_inputs; i++) {
702 char *name = av_asprintf("hrir%d", i - 1);
705 .type = AVMEDIA_TYPE_AUDIO,
708 return AVERROR(ENOMEM);
709 if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
715 s->fdsp = avpriv_float_dsp_alloc(0);
717 return AVERROR(ENOMEM);
722 static int config_output(AVFilterLink *outlink)
724 AVFilterContext *ctx = outlink->src;
725 HeadphoneContext *s = ctx->priv;
726 AVFilterLink *inlink = ctx->inputs[0];
728 if (s->hrir_fmt == HRIR_MULTI) {
729 AVFilterLink *hrir_link = ctx->inputs[1];
731 if (hrir_link->channels < inlink->channels * 2) {
732 av_log(ctx, AV_LOG_ERROR, "Number of channels in HRIR stream must be >= %d.\n", inlink->channels * 2);
733 return AVERROR(EINVAL);
737 s->gain_lfe = expf((s->gain - 3 * inlink->channels + s->lfe_gain) / 20 * M_LN10);
742 static av_cold void uninit(AVFilterContext *ctx)
744 HeadphoneContext *s = ctx->priv;
746 av_fft_end(s->ifft[0]);
747 av_fft_end(s->ifft[1]);
748 av_fft_end(s->fft[0]);
749 av_fft_end(s->fft[1]);
750 av_freep(&s->data_ir[0]);
751 av_freep(&s->data_ir[1]);
752 av_freep(&s->ringbuffer[0]);
753 av_freep(&s->ringbuffer[1]);
754 av_freep(&s->temp_src[0]);
755 av_freep(&s->temp_src[1]);
756 av_freep(&s->temp_fft[0]);
757 av_freep(&s->temp_fft[1]);
758 av_freep(&s->temp_afft[0]);
759 av_freep(&s->temp_afft[1]);
760 av_freep(&s->data_hrtf[0]);
761 av_freep(&s->data_hrtf[1]);
765 for (unsigned i = 1; i < ctx->nb_inputs; i++)
766 av_freep(&ctx->input_pads[i].name);
769 #define OFFSET(x) offsetof(HeadphoneContext, x)
770 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
772 static const AVOption headphone_options[] = {
773 { "map", "set channels convolution mappings", OFFSET(map), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
774 { "gain", "set gain in dB", OFFSET(gain), AV_OPT_TYPE_FLOAT, {.dbl=0}, -20, 40, .flags = FLAGS },
775 { "lfe", "set lfe gain in dB", OFFSET(lfe_gain), AV_OPT_TYPE_FLOAT, {.dbl=0}, -20, 40, .flags = FLAGS },
776 { "type", "set processing", OFFSET(type), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, .flags = FLAGS, "type" },
777 { "time", "time domain", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, .flags = FLAGS, "type" },
778 { "freq", "frequency domain", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, .flags = FLAGS, "type" },
779 { "size", "set frame size", OFFSET(size), AV_OPT_TYPE_INT, {.i64=1024},1024,96000, .flags = FLAGS },
780 { "hrir", "set hrir format", OFFSET(hrir_fmt), AV_OPT_TYPE_INT, {.i64=HRIR_STEREO}, 0, 1, .flags = FLAGS, "hrir" },
781 { "stereo", "hrir files have exactly 2 channels", 0, AV_OPT_TYPE_CONST, {.i64=HRIR_STEREO}, 0, 0, .flags = FLAGS, "hrir" },
782 { "multich", "single multichannel hrir file", 0, AV_OPT_TYPE_CONST, {.i64=HRIR_MULTI}, 0, 0, .flags = FLAGS, "hrir" },
786 AVFILTER_DEFINE_CLASS(headphone);
788 static const AVFilterPad outputs[] = {
791 .type = AVMEDIA_TYPE_AUDIO,
792 .config_props = config_output,
797 AVFilter ff_af_headphone = {
799 .description = NULL_IF_CONFIG_SMALL("Apply headphone binaural spatialization with HRTFs in additional streams."),
800 .priv_size = sizeof(HeadphoneContext),
801 .priv_class = &headphone_class,
804 .query_formats = query_formats,
805 .activate = activate,
808 .flags = AVFILTER_FLAG_SLICE_THREADS | AVFILTER_FLAG_DYNAMIC_INPUTS,