2 * Copyright (c) 2016 Muhammad Faiz <mfcc64@gmail.com>
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
21 #include "libavutil/opt.h"
22 #include "libavutil/eval.h"
23 #include "libavutil/avassert.h"
24 #include "libavcodec/avfft.h"
29 #define RDFT_BITS_MIN 4
30 #define RDFT_BITS_MAX 16
54 #define NB_GAIN_ENTRY_MAX 4096
68 RDFTContext *analysis_rdft;
69 RDFTContext *analysis_irdft;
72 int analysis_rdft_len;
77 float *kernel_tmp_buf;
80 OverlapIndex *conv_idx;
84 int frame_nsamples_max;
90 const char *gain_entry;
103 GainEntry gain_entry_tbl[NB_GAIN_ENTRY_MAX];
104 } FIREqualizerContext;
106 #define OFFSET(x) offsetof(FIREqualizerContext, x)
107 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
109 static const AVOption firequalizer_options[] = {
110 { "gain", "set gain curve", OFFSET(gain), AV_OPT_TYPE_STRING, { .str = "gain_interpolate(f)" }, 0, 0, FLAGS },
111 { "gain_entry", "set gain entry", OFFSET(gain_entry), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS },
112 { "delay", "set delay", OFFSET(delay), AV_OPT_TYPE_DOUBLE, { .dbl = 0.01 }, 0.0, 1e10, FLAGS },
113 { "accuracy", "set accuracy", OFFSET(accuracy), AV_OPT_TYPE_DOUBLE, { .dbl = 5.0 }, 0.0, 1e10, FLAGS },
114 { "wfunc", "set window function", OFFSET(wfunc), AV_OPT_TYPE_INT, { .i64 = WFUNC_HANN }, 0, NB_WFUNC-1, FLAGS, "wfunc" },
115 { "rectangular", "rectangular window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_RECTANGULAR }, 0, 0, FLAGS, "wfunc" },
116 { "hann", "hann window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_HANN }, 0, 0, FLAGS, "wfunc" },
117 { "hamming", "hamming window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_HAMMING }, 0, 0, FLAGS, "wfunc" },
118 { "blackman", "blackman window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_BLACKMAN }, 0, 0, FLAGS, "wfunc" },
119 { "nuttall3", "3-term nuttall window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_NUTTALL3 }, 0, 0, FLAGS, "wfunc" },
120 { "mnuttall3", "minimum 3-term nuttall window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_MNUTTALL3 }, 0, 0, FLAGS, "wfunc" },
121 { "nuttall", "nuttall window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_NUTTALL }, 0, 0, FLAGS, "wfunc" },
122 { "bnuttall", "blackman-nuttall window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_BNUTTALL }, 0, 0, FLAGS, "wfunc" },
123 { "bharris", "blackman-harris window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_BHARRIS }, 0, 0, FLAGS, "wfunc" },
124 { "tukey", "tukey window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_TUKEY }, 0, 0, FLAGS, "wfunc" },
125 { "fixed", "set fixed frame samples", OFFSET(fixed), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
126 { "multi", "set multi channels mode", OFFSET(multi), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
127 { "zero_phase", "set zero phase mode", OFFSET(zero_phase), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
128 { "scale", "set gain scale", OFFSET(scale), AV_OPT_TYPE_INT, { .i64 = SCALE_LINLOG }, 0, NB_SCALE-1, FLAGS, "scale" },
129 { "linlin", "linear-freq linear-gain", 0, AV_OPT_TYPE_CONST, { .i64 = SCALE_LINLIN }, 0, 0, FLAGS, "scale" },
130 { "linlog", "linear-freq logarithmic-gain", 0, AV_OPT_TYPE_CONST, { .i64 = SCALE_LINLOG }, 0, 0, FLAGS, "scale" },
131 { "loglin", "logarithmic-freq linear-gain", 0, AV_OPT_TYPE_CONST, { .i64 = SCALE_LOGLIN }, 0, 0, FLAGS, "scale" },
132 { "loglog", "logarithmic-freq logarithmic-gain", 0, AV_OPT_TYPE_CONST, { .i64 = SCALE_LOGLOG }, 0, 0, FLAGS, "scale" },
133 { "dumpfile", "set dump file", OFFSET(dumpfile), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS },
134 { "dumpscale", "set dump scale", OFFSET(dumpscale), AV_OPT_TYPE_INT, { .i64 = SCALE_LINLOG }, 0, NB_SCALE-1, FLAGS, "scale" },
138 AVFILTER_DEFINE_CLASS(firequalizer);
140 static void common_uninit(FIREqualizerContext *s)
142 av_rdft_end(s->analysis_rdft);
143 av_rdft_end(s->analysis_irdft);
144 av_rdft_end(s->rdft);
145 av_rdft_end(s->irdft);
146 s->analysis_rdft = s->analysis_irdft = s->rdft = s->irdft = NULL;
148 av_freep(&s->analysis_buf);
149 av_freep(&s->dump_buf);
150 av_freep(&s->kernel_tmp_buf);
151 av_freep(&s->kernel_buf);
152 av_freep(&s->conv_buf);
153 av_freep(&s->conv_idx);
156 static av_cold void uninit(AVFilterContext *ctx)
158 FIREqualizerContext *s = ctx->priv;
161 av_freep(&s->gain_cmd);
162 av_freep(&s->gain_entry_cmd);
165 static int query_formats(AVFilterContext *ctx)
167 AVFilterChannelLayouts *layouts;
168 AVFilterFormats *formats;
169 static const enum AVSampleFormat sample_fmts[] = {
175 layouts = ff_all_channel_counts();
177 return AVERROR(ENOMEM);
178 ret = ff_set_common_channel_layouts(ctx, layouts);
182 formats = ff_make_format_list(sample_fmts);
184 return AVERROR(ENOMEM);
185 ret = ff_set_common_formats(ctx, formats);
189 formats = ff_all_samplerates();
191 return AVERROR(ENOMEM);
192 return ff_set_common_samplerates(ctx, formats);
195 static void fast_convolute(FIREqualizerContext *s, const float *kernel_buf, float *conv_buf,
196 OverlapIndex *idx, float *data, int nsamples)
198 if (nsamples <= s->nsamples_max) {
199 float *buf = conv_buf + idx->buf_idx * s->rdft_len;
200 float *obuf = conv_buf + !idx->buf_idx * s->rdft_len + idx->overlap_idx;
201 int center = s->fir_len/2;
204 memset(buf, 0, center * sizeof(*data));
205 memcpy(buf + center, data, nsamples * sizeof(*data));
206 memset(buf + center + nsamples, 0, (s->rdft_len - nsamples - center) * sizeof(*data));
207 av_rdft_calc(s->rdft, buf);
209 buf[0] *= kernel_buf[0];
210 buf[1] *= kernel_buf[s->rdft_len/2];
211 for (k = 1; k < s->rdft_len/2; k++) {
212 buf[2*k] *= kernel_buf[k];
213 buf[2*k+1] *= kernel_buf[k];
216 av_rdft_calc(s->irdft, buf);
217 for (k = 0; k < s->rdft_len - idx->overlap_idx; k++)
219 memcpy(data, buf, nsamples * sizeof(*data));
220 idx->buf_idx = !idx->buf_idx;
221 idx->overlap_idx = nsamples;
223 while (nsamples > s->nsamples_max * 2) {
224 fast_convolute(s, kernel_buf, conv_buf, idx, data, s->nsamples_max);
225 data += s->nsamples_max;
226 nsamples -= s->nsamples_max;
228 fast_convolute(s, kernel_buf, conv_buf, idx, data, nsamples/2);
229 fast_convolute(s, kernel_buf, conv_buf, idx, data + nsamples/2, nsamples - nsamples/2);
233 static void dump_fir(AVFilterContext *ctx, FILE *fp, int ch)
235 FIREqualizerContext *s = ctx->priv;
236 int rate = ctx->inputs[0]->sample_rate;
237 int xlog = s->dumpscale == SCALE_LOGLIN || s->dumpscale == SCALE_LOGLOG;
238 int ylog = s->dumpscale == SCALE_LINLOG || s->dumpscale == SCALE_LOGLOG;
240 int center = s->fir_len / 2;
241 double delay = s->zero_phase ? 0.0 : (double) center / rate;
244 s->analysis_buf[0] *= s->rdft_len/2;
245 for (x = 1; x <= center; x++) {
246 s->analysis_buf[x] *= s->rdft_len/2;
247 s->analysis_buf[s->analysis_rdft_len - x] *= s->rdft_len/2;
253 fprintf(fp, "# time[%d] (time amplitude)\n", ch);
255 for (x = center; x > 0; x--)
256 fprintf(fp, "%15.10f %15.10f\n", delay - (double) x / rate, (double) s->analysis_buf[s->analysis_rdft_len - x]);
258 for (x = 0; x <= center; x++)
259 fprintf(fp, "%15.10f %15.10f\n", delay + (double)x / rate , (double) s->analysis_buf[x]);
261 av_rdft_calc(s->analysis_rdft, s->analysis_buf);
263 fprintf(fp, "\n\n# freq[%d] (frequency desired_gain actual_gain)\n", ch);
265 for (x = 0; x <= s->analysis_rdft_len/2; x++) {
266 int i = (x == s->analysis_rdft_len/2) ? 1 : 2 * x;
267 vx = (double)x * rate / s->analysis_rdft_len;
271 yb = s->analysis_buf[i];
273 ya = 20.0 * log10(fabs(ya));
274 yb = 20.0 * log10(fabs(yb));
276 fprintf(fp, "%17.10f %17.10f %17.10f\n", vx, ya, yb);
280 static double entry_func(void *p, double freq, double gain)
282 AVFilterContext *ctx = p;
283 FIREqualizerContext *s = ctx->priv;
285 if (s->nb_gain_entry >= NB_GAIN_ENTRY_MAX) {
286 av_log(ctx, AV_LOG_ERROR, "entry table overflow.\n");
287 s->gain_entry_err = AVERROR(EINVAL);
292 av_log(ctx, AV_LOG_ERROR, "nan frequency (%g, %g).\n", freq, gain);
293 s->gain_entry_err = AVERROR(EINVAL);
297 if (s->nb_gain_entry > 0 && freq <= s->gain_entry_tbl[s->nb_gain_entry - 1].freq) {
298 av_log(ctx, AV_LOG_ERROR, "unsorted frequency (%g, %g).\n", freq, gain);
299 s->gain_entry_err = AVERROR(EINVAL);
303 s->gain_entry_tbl[s->nb_gain_entry].freq = freq;
304 s->gain_entry_tbl[s->nb_gain_entry].gain = gain;
309 static int gain_entry_compare(const void *key, const void *memb)
311 const double *freq = key;
312 const GainEntry *entry = memb;
314 if (*freq < entry[0].freq)
316 if (*freq > entry[1].freq)
321 static double gain_interpolate_func(void *p, double freq)
323 AVFilterContext *ctx = p;
324 FIREqualizerContext *s = ctx->priv;
331 if (!s->nb_gain_entry)
334 if (freq <= s->gain_entry_tbl[0].freq)
335 return s->gain_entry_tbl[0].gain;
337 if (freq >= s->gain_entry_tbl[s->nb_gain_entry-1].freq)
338 return s->gain_entry_tbl[s->nb_gain_entry-1].gain;
340 res = bsearch(&freq, &s->gain_entry_tbl, s->nb_gain_entry - 1, sizeof(*res), gain_entry_compare);
343 d = res[1].freq - res[0].freq;
344 d0 = freq - res[0].freq;
345 d1 = res[1].freq - freq;
348 return (d0 * res[1].gain + d1 * res[0].gain) / d;
356 static double cubic_interpolate_func(void *p, double freq)
358 AVFilterContext *ctx = p;
359 FIREqualizerContext *s = ctx->priv;
363 double m0, m1, m2, msum, unit;
365 if (!s->nb_gain_entry)
368 if (freq <= s->gain_entry_tbl[0].freq)
369 return s->gain_entry_tbl[0].gain;
371 if (freq >= s->gain_entry_tbl[s->nb_gain_entry-1].freq)
372 return s->gain_entry_tbl[s->nb_gain_entry-1].gain;
374 res = bsearch(&freq, &s->gain_entry_tbl, s->nb_gain_entry - 1, sizeof(*res), gain_entry_compare);
377 unit = res[1].freq - res[0].freq;
378 m0 = res != s->gain_entry_tbl ?
379 unit * (res[0].gain - res[-1].gain) / (res[0].freq - res[-1].freq) : 0;
380 m1 = res[1].gain - res[0].gain;
381 m2 = res != s->gain_entry_tbl + s->nb_gain_entry - 2 ?
382 unit * (res[2].gain - res[1].gain) / (res[2].freq - res[1].freq) : 0;
384 msum = fabs(m0) + fabs(m1);
385 m0 = msum > 0 ? (fabs(m0) * m1 + fabs(m1) * m0) / msum : 0;
386 msum = fabs(m1) + fabs(m2);
387 m1 = msum > 0 ? (fabs(m1) * m2 + fabs(m2) * m1) / msum : 0;
391 b = 3 * res[1].gain - m1 - 2 * c - 3 * d;
392 a = res[1].gain - b - c - d;
394 x = (freq - res[0].freq) / unit;
398 return a * x3 + b * x2 + c * x + d;
401 static const char *const var_names[] = {
421 static int generate_kernel(AVFilterContext *ctx, const char *gain, const char *gain_entry)
423 FIREqualizerContext *s = ctx->priv;
424 AVFilterLink *inlink = ctx->inputs[0];
425 const char *gain_entry_func_names[] = { "entry", NULL };
426 const char *gain_func_names[] = { "gain_interpolate", "cubic_interpolate", NULL };
427 double (*gain_entry_funcs[])(void *, double, double) = { entry_func, NULL };
428 double (*gain_funcs[])(void *, double) = { gain_interpolate_func, cubic_interpolate_func, NULL };
431 int ret, k, center, ch;
432 int xlog = s->scale == SCALE_LOGLIN || s->scale == SCALE_LOGLOG;
433 int ylog = s->scale == SCALE_LINLOG || s->scale == SCALE_LOGLOG;
434 FILE *dump_fp = NULL;
436 s->nb_gain_entry = 0;
437 s->gain_entry_err = 0;
440 ret = av_expr_parse_and_eval(&result, gain_entry, NULL, NULL, NULL, NULL,
441 gain_entry_func_names, gain_entry_funcs, ctx, 0, ctx);
444 if (s->gain_entry_err < 0)
445 return s->gain_entry_err;
448 av_log(ctx, AV_LOG_DEBUG, "nb_gain_entry = %d.\n", s->nb_gain_entry);
450 ret = av_expr_parse(&gain_expr, gain, var_names,
451 gain_func_names, gain_funcs, NULL, NULL, 0, ctx);
455 if (s->dumpfile && (!s->dump_buf || !s->analysis_rdft || !(dump_fp = fopen(s->dumpfile, "w"))))
456 av_log(ctx, AV_LOG_WARNING, "dumping failed.\n");
458 vars[VAR_CHS] = inlink->channels;
459 vars[VAR_CHLAYOUT] = inlink->channel_layout;
460 vars[VAR_SR] = inlink->sample_rate;
461 for (ch = 0; ch < inlink->channels; ch++) {
462 float *rdft_buf = s->kernel_tmp_buf + ch * s->rdft_len;
465 vars[VAR_CHID] = av_channel_layout_extract_channel(inlink->channel_layout, ch);
468 vars[VAR_F] = log2(0.05 * vars[VAR_F]);
469 result = av_expr_eval(gain_expr, vars, ctx);
470 s->analysis_buf[0] = ylog ? pow(10.0, 0.05 * result) : result;
472 vars[VAR_F] = 0.5 * inlink->sample_rate;
474 vars[VAR_F] = log2(0.05 * vars[VAR_F]);
475 result = av_expr_eval(gain_expr, vars, ctx);
476 s->analysis_buf[1] = ylog ? pow(10.0, 0.05 * result) : result;
478 for (k = 1; k < s->analysis_rdft_len/2; k++) {
479 vars[VAR_F] = k * ((double)inlink->sample_rate /(double)s->analysis_rdft_len);
481 vars[VAR_F] = log2(0.05 * vars[VAR_F]);
482 result = av_expr_eval(gain_expr, vars, ctx);
483 s->analysis_buf[2*k] = ylog ? pow(10.0, 0.05 * result) : result;
484 s->analysis_buf[2*k+1] = 0.0;
488 memcpy(s->dump_buf, s->analysis_buf, s->analysis_rdft_len * sizeof(*s->analysis_buf));
490 av_rdft_calc(s->analysis_irdft, s->analysis_buf);
491 center = s->fir_len / 2;
493 for (k = 0; k <= center; k++) {
494 double u = k * (M_PI/center);
497 case WFUNC_RECTANGULAR:
501 win = 0.5 + 0.5 * cos(u);
504 win = 0.53836 + 0.46164 * cos(u);
507 win = 0.42 + 0.5 * cos(u) + 0.08 * cos(2*u);
510 win = 0.40897 + 0.5 * cos(u) + 0.09103 * cos(2*u);
512 case WFUNC_MNUTTALL3:
513 win = 0.4243801 + 0.4973406 * cos(u) + 0.0782793 * cos(2*u);
516 win = 0.355768 + 0.487396 * cos(u) + 0.144232 * cos(2*u) + 0.012604 * cos(3*u);
519 win = 0.3635819 + 0.4891775 * cos(u) + 0.1365995 * cos(2*u) + 0.0106411 * cos(3*u);
522 win = 0.35875 + 0.48829 * cos(u) + 0.14128 * cos(2*u) + 0.01168 * cos(3*u);
525 win = (u <= 0.5 * M_PI) ? 1.0 : (0.5 + 0.5 * cos(2*u - M_PI));
530 s->analysis_buf[k] *= (2.0/s->analysis_rdft_len) * (2.0/s->rdft_len) * win;
532 s->analysis_buf[s->analysis_rdft_len - k] = s->analysis_buf[k];
535 memset(s->analysis_buf + center + 1, 0, (s->analysis_rdft_len - s->fir_len) * sizeof(*s->analysis_buf));
536 memcpy(rdft_buf, s->analysis_buf, s->rdft_len/2 * sizeof(*s->analysis_buf));
537 memcpy(rdft_buf + s->rdft_len/2, s->analysis_buf + s->analysis_rdft_len - s->rdft_len/2, s->rdft_len/2 * sizeof(*s->analysis_buf));
538 av_rdft_calc(s->rdft, rdft_buf);
540 for (k = 0; k < s->rdft_len; k++) {
541 if (isnan(rdft_buf[k]) || isinf(rdft_buf[k])) {
542 av_log(ctx, AV_LOG_ERROR, "filter kernel contains nan or infinity.\n");
543 av_expr_free(gain_expr);
546 return AVERROR(EINVAL);
550 rdft_buf[s->rdft_len-1] = rdft_buf[1];
551 for (k = 0; k < s->rdft_len/2; k++)
552 rdft_buf[k] = rdft_buf[2*k];
553 rdft_buf[s->rdft_len/2] = rdft_buf[s->rdft_len-1];
556 dump_fir(ctx, dump_fp, ch);
562 memcpy(s->kernel_buf, s->kernel_tmp_buf, (s->multi ? inlink->channels : 1) * s->rdft_len * sizeof(*s->kernel_buf));
563 av_expr_free(gain_expr);
569 #define SELECT_GAIN(s) (s->gain_cmd ? s->gain_cmd : s->gain)
570 #define SELECT_GAIN_ENTRY(s) (s->gain_entry_cmd ? s->gain_entry_cmd : s->gain_entry)
572 static int config_input(AVFilterLink *inlink)
574 AVFilterContext *ctx = inlink->dst;
575 FIREqualizerContext *s = ctx->priv;
581 s->frame_nsamples_max = 0;
583 s->fir_len = FFMAX(2 * (int)(inlink->sample_rate * s->delay) + 1, 3);
584 s->remaining = s->fir_len - 1;
586 for (rdft_bits = RDFT_BITS_MIN; rdft_bits <= RDFT_BITS_MAX; rdft_bits++) {
587 s->rdft_len = 1 << rdft_bits;
588 s->nsamples_max = s->rdft_len - s->fir_len + 1;
589 if (s->nsamples_max * 2 >= s->fir_len)
593 if (rdft_bits > RDFT_BITS_MAX) {
594 av_log(ctx, AV_LOG_ERROR, "too large delay, please decrease it.\n");
595 return AVERROR(EINVAL);
598 if (!(s->rdft = av_rdft_init(rdft_bits, DFT_R2C)) || !(s->irdft = av_rdft_init(rdft_bits, IDFT_C2R)))
599 return AVERROR(ENOMEM);
601 for ( ; rdft_bits <= RDFT_BITS_MAX; rdft_bits++) {
602 s->analysis_rdft_len = 1 << rdft_bits;
603 if (inlink->sample_rate <= s->accuracy * s->analysis_rdft_len)
607 if (rdft_bits > RDFT_BITS_MAX) {
608 av_log(ctx, AV_LOG_ERROR, "too small accuracy, please increase it.\n");
609 return AVERROR(EINVAL);
612 if (!(s->analysis_irdft = av_rdft_init(rdft_bits, IDFT_C2R)))
613 return AVERROR(ENOMEM);
616 s->analysis_rdft = av_rdft_init(rdft_bits, DFT_R2C);
617 s->dump_buf = av_malloc_array(s->analysis_rdft_len, sizeof(*s->dump_buf));
620 s->analysis_buf = av_malloc_array(s->analysis_rdft_len, sizeof(*s->analysis_buf));
621 s->kernel_tmp_buf = av_malloc_array(s->rdft_len * (s->multi ? inlink->channels : 1), sizeof(*s->kernel_tmp_buf));
622 s->kernel_buf = av_malloc_array(s->rdft_len * (s->multi ? inlink->channels : 1), sizeof(*s->kernel_buf));
623 s->conv_buf = av_calloc(2 * s->rdft_len * inlink->channels, sizeof(*s->conv_buf));
624 s->conv_idx = av_calloc(inlink->channels, sizeof(*s->conv_idx));
625 if (!s->analysis_buf || !s->kernel_tmp_buf || !s->kernel_buf || !s->conv_buf || !s->conv_idx)
626 return AVERROR(ENOMEM);
628 av_log(ctx, AV_LOG_DEBUG, "sample_rate = %d, channels = %d, analysis_rdft_len = %d, rdft_len = %d, fir_len = %d, nsamples_max = %d.\n",
629 inlink->sample_rate, inlink->channels, s->analysis_rdft_len, s->rdft_len, s->fir_len, s->nsamples_max);
632 inlink->min_samples = inlink->max_samples = inlink->partial_buf_size = s->nsamples_max;
634 return generate_kernel(ctx, SELECT_GAIN(s), SELECT_GAIN_ENTRY(s));
637 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
639 AVFilterContext *ctx = inlink->dst;
640 FIREqualizerContext *s = ctx->priv;
643 for (ch = 0; ch < inlink->channels; ch++) {
644 fast_convolute(s, s->kernel_buf + (s->multi ? ch * s->rdft_len : 0),
645 s->conv_buf + 2 * ch * s->rdft_len, s->conv_idx + ch,
646 (float *) frame->extended_data[ch], frame->nb_samples);
649 s->next_pts = AV_NOPTS_VALUE;
650 if (frame->pts != AV_NOPTS_VALUE) {
651 s->next_pts = frame->pts + av_rescale_q(frame->nb_samples, av_make_q(1, inlink->sample_rate), inlink->time_base);
653 frame->pts -= av_rescale_q(s->fir_len/2, av_make_q(1, inlink->sample_rate), inlink->time_base);
655 s->frame_nsamples_max = FFMAX(s->frame_nsamples_max, frame->nb_samples);
656 return ff_filter_frame(ctx->outputs[0], frame);
659 static int request_frame(AVFilterLink *outlink)
661 AVFilterContext *ctx = outlink->src;
662 FIREqualizerContext *s= ctx->priv;
665 ret = ff_request_frame(ctx->inputs[0]);
666 if (ret == AVERROR_EOF && s->remaining > 0 && s->frame_nsamples_max > 0) {
667 AVFrame *frame = ff_get_audio_buffer(outlink, FFMIN(s->remaining, s->frame_nsamples_max));
670 return AVERROR(ENOMEM);
672 av_samples_set_silence(frame->extended_data, 0, frame->nb_samples, outlink->channels, frame->format);
673 frame->pts = s->next_pts;
674 s->remaining -= frame->nb_samples;
675 ret = filter_frame(ctx->inputs[0], frame);
681 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
682 char *res, int res_len, int flags)
684 FIREqualizerContext *s = ctx->priv;
685 int ret = AVERROR(ENOSYS);
687 if (!strcmp(cmd, "gain")) {
690 if (SELECT_GAIN(s) && !strcmp(SELECT_GAIN(s), args)) {
691 av_log(ctx, AV_LOG_DEBUG, "equal gain, do not rebuild.\n");
695 gain_cmd = av_strdup(args);
697 return AVERROR(ENOMEM);
699 ret = generate_kernel(ctx, gain_cmd, SELECT_GAIN_ENTRY(s));
701 av_freep(&s->gain_cmd);
702 s->gain_cmd = gain_cmd;
706 } else if (!strcmp(cmd, "gain_entry")) {
707 char *gain_entry_cmd;
709 if (SELECT_GAIN_ENTRY(s) && !strcmp(SELECT_GAIN_ENTRY(s), args)) {
710 av_log(ctx, AV_LOG_DEBUG, "equal gain_entry, do not rebuild.\n");
714 gain_entry_cmd = av_strdup(args);
716 return AVERROR(ENOMEM);
718 ret = generate_kernel(ctx, SELECT_GAIN(s), gain_entry_cmd);
720 av_freep(&s->gain_entry_cmd);
721 s->gain_entry_cmd = gain_entry_cmd;
723 av_freep(&gain_entry_cmd);
730 static const AVFilterPad firequalizer_inputs[] = {
733 .config_props = config_input,
734 .filter_frame = filter_frame,
735 .type = AVMEDIA_TYPE_AUDIO,
741 static const AVFilterPad firequalizer_outputs[] = {
744 .request_frame = request_frame,
745 .type = AVMEDIA_TYPE_AUDIO,
750 AVFilter ff_af_firequalizer = {
751 .name = "firequalizer",
752 .description = NULL_IF_CONFIG_SMALL("Finite Impulse Response Equalizer."),
754 .query_formats = query_formats,
755 .process_command = process_command,
756 .priv_size = sizeof(FIREqualizerContext),
757 .inputs = firequalizer_inputs,
758 .outputs = firequalizer_outputs,
759 .priv_class = &firequalizer_class,