GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/af_headphone.c Lines: 0 402 0.0 %
Date: 2020-10-23 17:01:47 Branches: 0 196 0.0 %

Line Branch Exec Source
1
/*
2
 * Copyright (C) 2017 Paul B Mahol
3
 * Copyright (C) 2013-2015 Andreas Fuchs, Wolfgang Hrauda
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 <math.h>
22
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"
29
30
#include "avfilter.h"
31
#include "filters.h"
32
#include "internal.h"
33
#include "audio.h"
34
35
#define TIME_DOMAIN      0
36
#define FREQUENCY_DOMAIN 1
37
38
#define HRIR_STEREO 0
39
#define HRIR_MULTI  1
40
41
typedef struct HeadphoneContext {
42
    const AVClass *class;
43
44
    char *map;
45
    int type;
46
47
    int lfe_channel;
48
49
    int have_hrirs;
50
    int eof_hrirs;
51
52
    int ir_len;
53
    int air_len;
54
55
    int nb_hrir_inputs;
56
57
    int nb_irs;
58
59
    float gain;
60
    float lfe_gain, gain_lfe;
61
62
    float *ringbuffer[2];
63
    int write[2];
64
65
    int buffer_length;
66
    int n_fft;
67
    int size;
68
    int hrir_fmt;
69
70
    float *data_ir[2];
71
    float *temp_src[2];
72
    FFTComplex *temp_fft[2];
73
    FFTComplex *temp_afft[2];
74
75
    FFTContext *fft[2], *ifft[2];
76
    FFTComplex *data_hrtf[2];
77
78
    float (*scalarproduct_float)(const float *v1, const float *v2, int len);
79
    struct hrir_inputs {
80
        int          ir_len;
81
        int          eof;
82
    } hrir_in[64];
83
    uint64_t mapping[64];
84
} HeadphoneContext;
85
86
static int parse_channel_name(const char *arg, uint64_t *rchannel)
87
{
88
    uint64_t layout = av_get_channel_layout(arg);
89
90
    if (av_get_channel_layout_nb_channels(layout) != 1)
91
        return AVERROR(EINVAL);
92
    *rchannel = layout;
93
    return 0;
94
}
95
96
static void parse_map(AVFilterContext *ctx)
97
{
98
    HeadphoneContext *s = ctx->priv;
99
    char *arg, *tokenizer, *p;
100
    uint64_t used_channels = 0;
101
102
    p = s->map;
103
    while ((arg = av_strtok(p, "|", &tokenizer))) {
104
        uint64_t out_channel;
105
106
        p = NULL;
107
        if (parse_channel_name(arg, &out_channel)) {
108
            av_log(ctx, AV_LOG_WARNING, "Failed to parse \'%s\' as channel name.\n", arg);
109
            continue;
110
        }
111
        if (used_channels & out_channel) {
112
            av_log(ctx, AV_LOG_WARNING, "Ignoring duplicate channel '%s'.\n", arg);
113
            continue;
114
        }
115
        used_channels        |= out_channel;
116
        s->mapping[s->nb_irs] = out_channel;
117
        s->nb_irs++;
118
    }
119
120
    if (s->hrir_fmt == HRIR_MULTI)
121
        s->nb_hrir_inputs = 1;
122
    else
123
        s->nb_hrir_inputs = s->nb_irs;
124
}
125
126
typedef struct ThreadData {
127
    AVFrame *in, *out;
128
    int *write;
129
    float **ir;
130
    int *n_clippings;
131
    float **ringbuffer;
132
    float **temp_src;
133
    FFTComplex **temp_fft;
134
    FFTComplex **temp_afft;
135
} ThreadData;
136
137
static int headphone_convolute(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
138
{
139
    HeadphoneContext *s = ctx->priv;
140
    ThreadData *td = arg;
141
    AVFrame *in = td->in, *out = td->out;
142
    int offset = jobnr;
143
    int *write = &td->write[jobnr];
144
    const float *const ir = td->ir[jobnr];
145
    int *n_clippings = &td->n_clippings[jobnr];
146
    float *ringbuffer = td->ringbuffer[jobnr];
147
    float *temp_src = td->temp_src[jobnr];
148
    const int ir_len = s->ir_len;
149
    const int air_len = s->air_len;
150
    const float *src = (const float *)in->data[0];
151
    float *dst = (float *)out->data[0];
152
    const int in_channels = in->channels;
153
    const int buffer_length = s->buffer_length;
154
    const uint32_t modulo = (uint32_t)buffer_length - 1;
155
    float *buffer[64];
156
    int wr = *write;
157
    int read;
158
    int i, l;
159
160
    dst += offset;
161
    for (l = 0; l < in_channels; l++) {
162
        buffer[l] = ringbuffer + l * buffer_length;
163
    }
164
165
    for (i = 0; i < in->nb_samples; i++) {
166
        const float *cur_ir = ir;
167
168
        *dst = 0;
169
        for (l = 0; l < in_channels; l++) {
170
            *(buffer[l] + wr) = src[l];
171
        }
172
173
        for (l = 0; l < in_channels; cur_ir += air_len, l++) {
174
            const float *const bptr = buffer[l];
175
176
            if (l == s->lfe_channel) {
177
                *dst += *(buffer[s->lfe_channel] + wr) * s->gain_lfe;
178
                continue;
179
            }
180
181
            read = (wr - (ir_len - 1)) & modulo;
182
183
            if (read + ir_len < buffer_length) {
184
                memcpy(temp_src, bptr + read, ir_len * sizeof(*temp_src));
185
            } else {
186
                int len = FFMIN(air_len - (read % ir_len), buffer_length - read);
187
188
                memcpy(temp_src, bptr + read, len * sizeof(*temp_src));
189
                memcpy(temp_src + len, bptr, (air_len - len) * sizeof(*temp_src));
190
            }
191
192
            dst[0] += s->scalarproduct_float(cur_ir, temp_src, FFALIGN(ir_len, 32));
193
        }
194
195
        if (fabsf(dst[0]) > 1)
196
            n_clippings[0]++;
197
198
        dst += 2;
199
        src += in_channels;
200
        wr   = (wr + 1) & modulo;
201
    }
202
203
    *write = wr;
204
205
    return 0;
206
}
207
208
static int headphone_fast_convolute(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
209
{
210
    HeadphoneContext *s = ctx->priv;
211
    ThreadData *td = arg;
212
    AVFrame *in = td->in, *out = td->out;
213
    int offset = jobnr;
214
    int *write = &td->write[jobnr];
215
    FFTComplex *hrtf = s->data_hrtf[jobnr];
216
    int *n_clippings = &td->n_clippings[jobnr];
217
    float *ringbuffer = td->ringbuffer[jobnr];
218
    const int ir_len = s->ir_len;
219
    const float *src = (const float *)in->data[0];
220
    float *dst = (float *)out->data[0];
221
    const int in_channels = in->channels;
222
    const int buffer_length = s->buffer_length;
223
    const uint32_t modulo = (uint32_t)buffer_length - 1;
224
    FFTComplex *fft_in = s->temp_fft[jobnr];
225
    FFTComplex *fft_acc = s->temp_afft[jobnr];
226
    FFTContext *ifft = s->ifft[jobnr];
227
    FFTContext *fft = s->fft[jobnr];
228
    const int n_fft = s->n_fft;
229
    const float fft_scale = 1.0f / s->n_fft;
230
    FFTComplex *hrtf_offset;
231
    int wr = *write;
232
    int n_read;
233
    int i, j;
234
235
    dst += offset;
236
237
    n_read = FFMIN(ir_len, in->nb_samples);
238
    for (j = 0; j < n_read; j++) {
239
        dst[2 * j]     = ringbuffer[wr];
240
        ringbuffer[wr] = 0.0;
241
        wr  = (wr + 1) & modulo;
242
    }
243
244
    for (j = n_read; j < in->nb_samples; j++) {
245
        dst[2 * j] = 0;
246
    }
247
248
    memset(fft_acc, 0, sizeof(FFTComplex) * n_fft);
249
250
    for (i = 0; i < in_channels; i++) {
251
        if (i == s->lfe_channel) {
252
            for (j = 0; j < in->nb_samples; j++) {
253
                dst[2 * j] += src[i + j * in_channels] * s->gain_lfe;
254
            }
255
            continue;
256
        }
257
258
        offset = i * n_fft;
259
        hrtf_offset = hrtf + offset;
260
261
        memset(fft_in, 0, sizeof(FFTComplex) * n_fft);
262
263
        for (j = 0; j < in->nb_samples; j++) {
264
            fft_in[j].re = src[j * in_channels + i];
265
        }
266
267
        av_fft_permute(fft, fft_in);
268
        av_fft_calc(fft, fft_in);
269
        for (j = 0; j < n_fft; j++) {
270
            const FFTComplex *hcomplex = hrtf_offset + j;
271
            const float re = fft_in[j].re;
272
            const float im = fft_in[j].im;
273
274
            fft_acc[j].re += re * hcomplex->re - im * hcomplex->im;
275
            fft_acc[j].im += re * hcomplex->im + im * hcomplex->re;
276
        }
277
    }
278
279
    av_fft_permute(ifft, fft_acc);
280
    av_fft_calc(ifft, fft_acc);
281
282
    for (j = 0; j < in->nb_samples; j++) {
283
        dst[2 * j] += fft_acc[j].re * fft_scale;
284
        if (fabsf(dst[2 * j]) > 1)
285
            n_clippings[0]++;
286
    }
287
288
    for (j = 0; j < ir_len - 1; j++) {
289
        int write_pos = (wr + j) & modulo;
290
291
        *(ringbuffer + write_pos) += fft_acc[in->nb_samples + j].re * fft_scale;
292
    }
293
294
    *write = wr;
295
296
    return 0;
297
}
298
299
static int check_ir(AVFilterLink *inlink, int input_number)
300
{
301
    AVFilterContext *ctx = inlink->dst;
302
    HeadphoneContext *s = ctx->priv;
303
    int ir_len, max_ir_len;
304
305
    ir_len = ff_inlink_queued_samples(inlink);
306
    max_ir_len = 65536;
307
    if (ir_len > max_ir_len) {
308
        av_log(ctx, AV_LOG_ERROR, "Too big length of IRs: %d > %d.\n", ir_len, max_ir_len);
309
        return AVERROR(EINVAL);
310
    }
311
    s->hrir_in[input_number].ir_len = ir_len;
312
    s->ir_len = FFMAX(ir_len, s->ir_len);
313
314
    return 0;
315
}
316
317
static int headphone_frame(HeadphoneContext *s, AVFrame *in, AVFilterLink *outlink)
318
{
319
    AVFilterContext *ctx = outlink->src;
320
    int n_clippings[2] = { 0 };
321
    ThreadData td;
322
    AVFrame *out;
323
324
    out = ff_get_audio_buffer(outlink, in->nb_samples);
325
    if (!out) {
326
        av_frame_free(&in);
327
        return AVERROR(ENOMEM);
328
    }
329
    out->pts = in->pts;
330
331
    td.in = in; td.out = out; td.write = s->write;
332
    td.ir = s->data_ir; td.n_clippings = n_clippings;
333
    td.ringbuffer = s->ringbuffer; td.temp_src = s->temp_src;
334
    td.temp_fft = s->temp_fft;
335
    td.temp_afft = s->temp_afft;
336
337
    if (s->type == TIME_DOMAIN) {
338
        ctx->internal->execute(ctx, headphone_convolute, &td, NULL, 2);
339
    } else {
340
        ctx->internal->execute(ctx, headphone_fast_convolute, &td, NULL, 2);
341
    }
342
    emms_c();
343
344
    if (n_clippings[0] + n_clippings[1] > 0) {
345
        av_log(ctx, AV_LOG_WARNING, "%d of %d samples clipped. Please reduce gain.\n",
346
               n_clippings[0] + n_clippings[1], out->nb_samples * 2);
347
    }
348
349
    av_frame_free(&in);
350
    return ff_filter_frame(outlink, out);
351
}
352
353
static int convert_coeffs(AVFilterContext *ctx, AVFilterLink *inlink)
354
{
355
    struct HeadphoneContext *s = ctx->priv;
356
    const int ir_len = s->ir_len;
357
    int nb_input_channels = ctx->inputs[0]->channels;
358
    float gain_lin = expf((s->gain - 3 * nb_input_channels) / 20 * M_LN10);
359
    AVFrame *frame;
360
    int ret = 0;
361
    int n_fft;
362
    int i, j, k;
363
364
    s->air_len = 1 << (32 - ff_clz(ir_len));
365
    if (s->type == TIME_DOMAIN) {
366
        s->air_len = FFALIGN(s->air_len, 32);
367
    }
368
    s->buffer_length = 1 << (32 - ff_clz(s->air_len));
369
    s->n_fft = n_fft = 1 << (32 - ff_clz(ir_len + s->size));
370
371
    if (s->type == FREQUENCY_DOMAIN) {
372
        s->fft[0] = av_fft_init(av_log2(s->n_fft), 0);
373
        s->fft[1] = av_fft_init(av_log2(s->n_fft), 0);
374
        s->ifft[0] = av_fft_init(av_log2(s->n_fft), 1);
375
        s->ifft[1] = av_fft_init(av_log2(s->n_fft), 1);
376
377
        if (!s->fft[0] || !s->fft[1] || !s->ifft[0] || !s->ifft[1]) {
378
            av_log(ctx, AV_LOG_ERROR, "Unable to create FFT contexts of size %d.\n", s->n_fft);
379
            ret = AVERROR(ENOMEM);
380
            goto fail;
381
        }
382
    }
383
384
    if (s->type == TIME_DOMAIN) {
385
        s->ringbuffer[0] = av_calloc(s->buffer_length, sizeof(float) * nb_input_channels);
386
        s->ringbuffer[1] = av_calloc(s->buffer_length, sizeof(float) * nb_input_channels);
387
    } else {
388
        s->ringbuffer[0] = av_calloc(s->buffer_length, sizeof(float));
389
        s->ringbuffer[1] = av_calloc(s->buffer_length, sizeof(float));
390
        s->temp_fft[0] = av_calloc(s->n_fft, sizeof(FFTComplex));
391
        s->temp_fft[1] = av_calloc(s->n_fft, sizeof(FFTComplex));
392
        s->temp_afft[0] = av_calloc(s->n_fft, sizeof(FFTComplex));
393
        s->temp_afft[1] = av_calloc(s->n_fft, sizeof(FFTComplex));
394
        if (!s->temp_fft[0] || !s->temp_fft[1] ||
395
            !s->temp_afft[0] || !s->temp_afft[1]) {
396
            ret = AVERROR(ENOMEM);
397
            goto fail;
398
        }
399
    }
400
401
    if (!s->ringbuffer[0] || !s->ringbuffer[1]) {
402
        ret = AVERROR(ENOMEM);
403
        goto fail;
404
    }
405
406
    if (s->type == TIME_DOMAIN) {
407
        s->temp_src[0] = av_calloc(s->air_len, sizeof(float));
408
        s->temp_src[1] = av_calloc(s->air_len, sizeof(float));
409
410
        s->data_ir[0] = av_calloc(nb_input_channels * s->air_len, sizeof(*s->data_ir[0]));
411
        s->data_ir[1] = av_calloc(nb_input_channels * s->air_len, sizeof(*s->data_ir[1]));
412
        if (!s->data_ir[0] || !s->data_ir[1] || !s->temp_src[0] || !s->temp_src[1]) {
413
            ret = AVERROR(ENOMEM);
414
            goto fail;
415
        }
416
    } else {
417
        s->data_hrtf[0] = av_calloc(n_fft, sizeof(*s->data_hrtf[0]) * nb_input_channels);
418
        s->data_hrtf[1] = av_calloc(n_fft, sizeof(*s->data_hrtf[1]) * nb_input_channels);
419
        if (!s->data_hrtf[0] || !s->data_hrtf[1]) {
420
            ret = AVERROR(ENOMEM);
421
            goto fail;
422
        }
423
    }
424
425
    for (i = 0; i < s->nb_hrir_inputs; av_frame_free(&frame), i++) {
426
        int len = s->hrir_in[i].ir_len;
427
        float *ptr;
428
429
        ret = ff_inlink_consume_samples(ctx->inputs[i + 1], len, len, &frame);
430
        if (ret < 0)
431
            goto fail;
432
        ptr = (float *)frame->extended_data[0];
433
434
        if (s->hrir_fmt == HRIR_STEREO) {
435
            int idx = av_get_channel_layout_channel_index(inlink->channel_layout,
436
                                                          s->mapping[i]);
437
            if (idx < 0)
438
                continue;
439
            if (s->type == TIME_DOMAIN) {
440
                float *data_ir_l = s->data_ir[0] + idx * s->air_len;
441
                float *data_ir_r = s->data_ir[1] + idx * s->air_len;
442
443
                for (j = 0; j < len; j++) {
444
                    data_ir_l[j] = ptr[len * 2 - j * 2 - 2] * gain_lin;
445
                    data_ir_r[j] = ptr[len * 2 - j * 2 - 1] * gain_lin;
446
                }
447
            } else {
448
                FFTComplex *fft_in_l = s->data_hrtf[0] + idx * n_fft;
449
                FFTComplex *fft_in_r = s->data_hrtf[1] + idx * n_fft;
450
451
                for (j = 0; j < len; j++) {
452
                    fft_in_l[j].re = ptr[j * 2    ] * gain_lin;
453
                    fft_in_r[j].re = ptr[j * 2 + 1] * gain_lin;
454
                }
455
456
                av_fft_permute(s->fft[0], fft_in_l);
457
                av_fft_calc(s->fft[0], fft_in_l);
458
                av_fft_permute(s->fft[0], fft_in_r);
459
                av_fft_calc(s->fft[0], fft_in_r);
460
            }
461
        } else {
462
            int I, N = ctx->inputs[1]->channels;
463
464
            for (k = 0; k < N / 2; k++) {
465
                int idx = av_get_channel_layout_channel_index(inlink->channel_layout,
466
                                                              s->mapping[k]);
467
                if (idx < 0)
468
                    continue;
469
470
                I = k * 2;
471
                if (s->type == TIME_DOMAIN) {
472
                    float *data_ir_l = s->data_ir[0] + idx * s->air_len;
473
                    float *data_ir_r = s->data_ir[1] + idx * s->air_len;
474
475
                    for (j = 0; j < len; j++) {
476
                        data_ir_l[j] = ptr[len * N - j * N - N + I    ] * gain_lin;
477
                        data_ir_r[j] = ptr[len * N - j * N - N + I + 1] * gain_lin;
478
                    }
479
                } else {
480
                    FFTComplex *fft_in_l = s->data_hrtf[0] + idx * n_fft;
481
                    FFTComplex *fft_in_r = s->data_hrtf[1] + idx * n_fft;
482
483
                    for (j = 0; j < len; j++) {
484
                        fft_in_l[j].re = ptr[j * N + I    ] * gain_lin;
485
                        fft_in_r[j].re = ptr[j * N + I + 1] * gain_lin;
486
                    }
487
488
                    av_fft_permute(s->fft[0], fft_in_l);
489
                    av_fft_calc(s->fft[0], fft_in_l);
490
                    av_fft_permute(s->fft[0], fft_in_r);
491
                    av_fft_calc(s->fft[0], fft_in_r);
492
                }
493
            }
494
        }
495
    }
496
497
    s->have_hrirs = 1;
498
499
fail:
500
    return ret;
501
}
502
503
static int activate(AVFilterContext *ctx)
504
{
505
    HeadphoneContext *s = ctx->priv;
506
    AVFilterLink *inlink = ctx->inputs[0];
507
    AVFilterLink *outlink = ctx->outputs[0];
508
    AVFrame *in = NULL;
509
    int i, ret;
510
511
    FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx);
512
    if (!s->eof_hrirs) {
513
        int eof = 1;
514
        for (i = 0; i < s->nb_hrir_inputs; i++) {
515
            AVFilterLink *input = ctx->inputs[i + 1];
516
517
            if (s->hrir_in[i].eof)
518
                continue;
519
520
            if ((ret = check_ir(input, i)) < 0)
521
                return ret;
522
523
            if (ff_outlink_get_status(input) == AVERROR_EOF) {
524
                if (!ff_inlink_queued_samples(input)) {
525
                    av_log(ctx, AV_LOG_ERROR, "No samples provided for "
526
                           "HRIR stream %d.\n", i);
527
                    return AVERROR_INVALIDDATA;
528
                }
529
                s->hrir_in[i].eof = 1;
530
            } else {
531
                if (ff_outlink_frame_wanted(ctx->outputs[0]))
532
                    ff_inlink_request_frame(input);
533
                eof = 0;
534
            }
535
        }
536
        if (!eof)
537
            return 0;
538
        s->eof_hrirs = 1;
539
540
        ret = convert_coeffs(ctx, inlink);
541
        if (ret < 0)
542
            return ret;
543
    } else if (!s->have_hrirs)
544
        return AVERROR_EOF;
545
546
    if ((ret = ff_inlink_consume_samples(ctx->inputs[0], s->size, s->size, &in)) > 0) {
547
        ret = headphone_frame(s, in, outlink);
548
        if (ret < 0)
549
            return ret;
550
    }
551
552
    if (ret < 0)
553
        return ret;
554
555
    FF_FILTER_FORWARD_STATUS(ctx->inputs[0], ctx->outputs[0]);
556
    if (ff_outlink_frame_wanted(ctx->outputs[0]))
557
        ff_inlink_request_frame(ctx->inputs[0]);
558
559
    return 0;
560
}
561
562
static int query_formats(AVFilterContext *ctx)
563
{
564
    struct HeadphoneContext *s = ctx->priv;
565
    AVFilterFormats *formats = NULL;
566
    AVFilterChannelLayouts *layouts = NULL;
567
    AVFilterChannelLayouts *stereo_layout = NULL;
568
    AVFilterChannelLayouts *hrir_layouts = NULL;
569
    int ret, i;
570
571
    ret = ff_add_format(&formats, AV_SAMPLE_FMT_FLT);
572
    if (ret)
573
        return ret;
574
    ret = ff_set_common_formats(ctx, formats);
575
    if (ret)
576
        return ret;
577
578
    layouts = ff_all_channel_layouts();
579
    if (!layouts)
580
        return AVERROR(ENOMEM);
581
582
    ret = ff_channel_layouts_ref(layouts, &ctx->inputs[0]->outcfg.channel_layouts);
583
    if (ret)
584
        return ret;
585
586
    ret = ff_add_channel_layout(&stereo_layout, AV_CH_LAYOUT_STEREO);
587
    if (ret)
588
        return ret;
589
    ret = ff_channel_layouts_ref(stereo_layout, &ctx->outputs[0]->incfg.channel_layouts);
590
    if (ret)
591
        return ret;
592
593
    if (s->hrir_fmt == HRIR_MULTI) {
594
        hrir_layouts = ff_all_channel_counts();
595
        if (!hrir_layouts)
596
            return AVERROR(ENOMEM);
597
        ret = ff_channel_layouts_ref(hrir_layouts, &ctx->inputs[1]->outcfg.channel_layouts);
598
        if (ret)
599
            return ret;
600
    } else {
601
        for (i = 1; i <= s->nb_hrir_inputs; i++) {
602
            ret = ff_channel_layouts_ref(stereo_layout, &ctx->inputs[i]->outcfg.channel_layouts);
603
            if (ret)
604
                return ret;
605
        }
606
    }
607
608
    formats = ff_all_samplerates();
609
    if (!formats)
610
        return AVERROR(ENOMEM);
611
    return ff_set_common_samplerates(ctx, formats);
612
}
613
614
static int config_input(AVFilterLink *inlink)
615
{
616
    AVFilterContext *ctx = inlink->dst;
617
    HeadphoneContext *s = ctx->priv;
618
619
    if (s->nb_irs < inlink->channels) {
620
        av_log(ctx, AV_LOG_ERROR, "Number of HRIRs must be >= %d.\n", inlink->channels);
621
        return AVERROR(EINVAL);
622
    }
623
624
    s->lfe_channel = av_get_channel_layout_channel_index(inlink->channel_layout,
625
                                                         AV_CH_LOW_FREQUENCY);
626
    return 0;
627
}
628
629
static av_cold int init(AVFilterContext *ctx)
630
{
631
    HeadphoneContext *s = ctx->priv;
632
    int i, ret;
633
634
    AVFilterPad pad = {
635
        .name         = "in0",
636
        .type         = AVMEDIA_TYPE_AUDIO,
637
        .config_props = config_input,
638
    };
639
    if ((ret = ff_insert_inpad(ctx, 0, &pad)) < 0)
640
        return ret;
641
642
    if (!s->map) {
643
        av_log(ctx, AV_LOG_ERROR, "Valid mapping must be set.\n");
644
        return AVERROR(EINVAL);
645
    }
646
647
    parse_map(ctx);
648
649
    for (i = 0; i < s->nb_hrir_inputs; i++) {
650
        char *name = av_asprintf("hrir%d", i);
651
        AVFilterPad pad = {
652
            .name         = name,
653
            .type         = AVMEDIA_TYPE_AUDIO,
654
        };
655
        if (!name)
656
            return AVERROR(ENOMEM);
657
        if ((ret = ff_insert_inpad(ctx, i + 1, &pad)) < 0) {
658
            av_freep(&pad.name);
659
            return ret;
660
        }
661
    }
662
663
    if (s->type == TIME_DOMAIN) {
664
        AVFloatDSPContext *fdsp = avpriv_float_dsp_alloc(0);
665
        if (!fdsp)
666
            return AVERROR(ENOMEM);
667
        s->scalarproduct_float = fdsp->scalarproduct_float;
668
        av_free(fdsp);
669
    }
670
671
    return 0;
672
}
673
674
static int config_output(AVFilterLink *outlink)
675
{
676
    AVFilterContext *ctx = outlink->src;
677
    HeadphoneContext *s = ctx->priv;
678
    AVFilterLink *inlink = ctx->inputs[0];
679
680
    if (s->hrir_fmt == HRIR_MULTI) {
681
        AVFilterLink *hrir_link = ctx->inputs[1];
682
683
        if (hrir_link->channels < inlink->channels * 2) {
684
            av_log(ctx, AV_LOG_ERROR, "Number of channels in HRIR stream must be >= %d.\n", inlink->channels * 2);
685
            return AVERROR(EINVAL);
686
        }
687
    }
688
689
    s->gain_lfe = expf((s->gain - 3 * inlink->channels + s->lfe_gain) / 20 * M_LN10);
690
691
    return 0;
692
}
693
694
static av_cold void uninit(AVFilterContext *ctx)
695
{
696
    HeadphoneContext *s = ctx->priv;
697
698
    av_fft_end(s->ifft[0]);
699
    av_fft_end(s->ifft[1]);
700
    av_fft_end(s->fft[0]);
701
    av_fft_end(s->fft[1]);
702
    av_freep(&s->data_ir[0]);
703
    av_freep(&s->data_ir[1]);
704
    av_freep(&s->ringbuffer[0]);
705
    av_freep(&s->ringbuffer[1]);
706
    av_freep(&s->temp_src[0]);
707
    av_freep(&s->temp_src[1]);
708
    av_freep(&s->temp_fft[0]);
709
    av_freep(&s->temp_fft[1]);
710
    av_freep(&s->temp_afft[0]);
711
    av_freep(&s->temp_afft[1]);
712
    av_freep(&s->data_hrtf[0]);
713
    av_freep(&s->data_hrtf[1]);
714
715
    for (unsigned i = 1; i < ctx->nb_inputs; i++)
716
        av_freep(&ctx->input_pads[i].name);
717
}
718
719
#define OFFSET(x) offsetof(HeadphoneContext, x)
720
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
721
722
static const AVOption headphone_options[] = {
723
    { "map",       "set channels convolution mappings",  OFFSET(map),      AV_OPT_TYPE_STRING, {.str=NULL},            .flags = FLAGS },
724
    { "gain",      "set gain in dB",                     OFFSET(gain),     AV_OPT_TYPE_FLOAT,  {.dbl=0},     -20,  40, .flags = FLAGS },
725
    { "lfe",       "set lfe gain in dB",                 OFFSET(lfe_gain), AV_OPT_TYPE_FLOAT,  {.dbl=0},     -20,  40, .flags = FLAGS },
726
    { "type",      "set processing",                     OFFSET(type),     AV_OPT_TYPE_INT,    {.i64=1},       0,   1, .flags = FLAGS, "type" },
727
    { "time",      "time domain",                        0,                AV_OPT_TYPE_CONST,  {.i64=0},       0,   0, .flags = FLAGS, "type" },
728
    { "freq",      "frequency domain",                   0,                AV_OPT_TYPE_CONST,  {.i64=1},       0,   0, .flags = FLAGS, "type" },
729
    { "size",      "set frame size",                     OFFSET(size),     AV_OPT_TYPE_INT,    {.i64=1024},1024,96000, .flags = FLAGS },
730
    { "hrir",      "set hrir format",                    OFFSET(hrir_fmt), AV_OPT_TYPE_INT,    {.i64=HRIR_STEREO}, 0, 1, .flags = FLAGS, "hrir" },
731
    { "stereo",    "hrir files have exactly 2 channels", 0,                AV_OPT_TYPE_CONST,  {.i64=HRIR_STEREO}, 0, 0, .flags = FLAGS, "hrir" },
732
    { "multich",   "single multichannel hrir file",      0,                AV_OPT_TYPE_CONST,  {.i64=HRIR_MULTI},  0, 0, .flags = FLAGS, "hrir" },
733
    { NULL }
734
};
735
736
AVFILTER_DEFINE_CLASS(headphone);
737
738
static const AVFilterPad outputs[] = {
739
    {
740
        .name          = "default",
741
        .type          = AVMEDIA_TYPE_AUDIO,
742
        .config_props  = config_output,
743
    },
744
    { NULL }
745
};
746
747
AVFilter ff_af_headphone = {
748
    .name          = "headphone",
749
    .description   = NULL_IF_CONFIG_SMALL("Apply headphone binaural spatialization with HRTFs in additional streams."),
750
    .priv_size     = sizeof(HeadphoneContext),
751
    .priv_class    = &headphone_class,
752
    .init          = init,
753
    .uninit        = uninit,
754
    .query_formats = query_formats,
755
    .activate      = activate,
756
    .inputs        = NULL,
757
    .outputs       = outputs,
758
    .flags         = AVFILTER_FLAG_SLICE_THREADS | AVFILTER_FLAG_DYNAMIC_INPUTS,
759
};