0,0 → 1,620 |
/* |
* Copyright (c) 2013 Paul B Mahol |
* Copyright (c) 2006-2008 Rob Sykes <robs@users.sourceforge.net> |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
/* |
* 2-pole filters designed by Robert Bristow-Johnson <rbj@audioimagination.com> |
* see http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt |
* |
* 1-pole filters based on code (c) 2000 Chris Bagwell <cbagwell@sprynet.com> |
* Algorithms: Recursive single pole low/high pass filter |
* Reference: The Scientist and Engineer's Guide to Digital Signal Processing |
* |
* low-pass: output[N] = input[N] * A + output[N-1] * B |
* X = exp(-2.0 * pi * Fc) |
* A = 1 - X |
* B = X |
* Fc = cutoff freq / sample rate |
* |
* Mimics an RC low-pass filter: |
* |
* ---/\/\/\/\-----------> |
* | |
* --- C |
* --- |
* | |
* | |
* V |
* |
* high-pass: output[N] = A0 * input[N] + A1 * input[N-1] + B1 * output[N-1] |
* X = exp(-2.0 * pi * Fc) |
* A0 = (1 + X) / 2 |
* A1 = -(1 + X) / 2 |
* B1 = X |
* Fc = cutoff freq / sample rate |
* |
* Mimics an RC high-pass filter: |
* |
* || C |
* ----||---------> |
* || | |
* < |
* > R |
* < |
* | |
* V |
*/ |
|
#include "libavutil/avassert.h" |
#include "libavutil/opt.h" |
#include "audio.h" |
#include "avfilter.h" |
#include "internal.h" |
|
enum FilterType { |
biquad, |
equalizer, |
bass, |
treble, |
band, |
bandpass, |
bandreject, |
allpass, |
highpass, |
lowpass, |
}; |
|
enum WidthType { |
NONE, |
HERTZ, |
OCTAVE, |
QFACTOR, |
SLOPE, |
}; |
|
typedef struct ChanCache { |
double i1, i2; |
double o1, o2; |
} ChanCache; |
|
typedef struct { |
const AVClass *class; |
|
enum FilterType filter_type; |
enum WidthType width_type; |
int poles; |
int csg; |
|
double gain; |
double frequency; |
double width; |
|
double a0, a1, a2; |
double b0, b1, b2; |
|
ChanCache *cache; |
|
void (*filter)(const void *ibuf, void *obuf, int len, |
double *i1, double *i2, double *o1, double *o2, |
double b0, double b1, double b2, double a1, double a2); |
} BiquadsContext; |
|
static av_cold int init(AVFilterContext *ctx) |
{ |
BiquadsContext *p = ctx->priv; |
|
if (p->filter_type != biquad) { |
if (p->frequency <= 0 || p->width <= 0) { |
av_log(ctx, AV_LOG_ERROR, "Invalid frequency %f and/or width %f <= 0\n", |
p->frequency, p->width); |
return AVERROR(EINVAL); |
} |
} |
|
return 0; |
} |
|
static int query_formats(AVFilterContext *ctx) |
{ |
AVFilterFormats *formats; |
AVFilterChannelLayouts *layouts; |
static const enum AVSampleFormat sample_fmts[] = { |
AV_SAMPLE_FMT_S16P, |
AV_SAMPLE_FMT_S32P, |
AV_SAMPLE_FMT_FLTP, |
AV_SAMPLE_FMT_DBLP, |
AV_SAMPLE_FMT_NONE |
}; |
|
layouts = ff_all_channel_layouts(); |
if (!layouts) |
return AVERROR(ENOMEM); |
ff_set_common_channel_layouts(ctx, layouts); |
|
formats = ff_make_format_list(sample_fmts); |
if (!formats) |
return AVERROR(ENOMEM); |
ff_set_common_formats(ctx, formats); |
|
formats = ff_all_samplerates(); |
if (!formats) |
return AVERROR(ENOMEM); |
ff_set_common_samplerates(ctx, formats); |
|
return 0; |
} |
|
#define BIQUAD_FILTER(name, type, min, max) \ |
static void biquad_## name (const void *input, void *output, int len, \ |
double *in1, double *in2, \ |
double *out1, double *out2, \ |
double b0, double b1, double b2, \ |
double a1, double a2) \ |
{ \ |
const type *ibuf = input; \ |
type *obuf = output; \ |
double i1 = *in1; \ |
double i2 = *in2; \ |
double o1 = *out1; \ |
double o2 = *out2; \ |
int i; \ |
a1 = -a1; \ |
a2 = -a2; \ |
\ |
for (i = 0; i+1 < len; i++) { \ |
o2 = i2 * b2 + i1 * b1 + ibuf[i] * b0 + o2 * a2 + o1 * a1; \ |
i2 = ibuf[i]; \ |
if (o2 < min) { \ |
av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ |
obuf[i] = min; \ |
} else if (o2 > max) { \ |
av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ |
obuf[i] = max; \ |
} else { \ |
obuf[i] = o2; \ |
} \ |
i++; \ |
o1 = i1 * b2 + i2 * b1 + ibuf[i] * b0 + o1 * a2 + o2 * a1; \ |
i1 = ibuf[i]; \ |
if (o1 < min) { \ |
av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ |
obuf[i] = min; \ |
} else if (o1 > max) { \ |
av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ |
obuf[i] = max; \ |
} else { \ |
obuf[i] = o1; \ |
} \ |
} \ |
if (i < len) { \ |
double o0 = ibuf[i] * b0 + i1 * b1 + i2 * b2 + o1 * a1 + o2 * a2; \ |
i2 = i1; \ |
i1 = ibuf[i]; \ |
o2 = o1; \ |
o1 = o0; \ |
if (o0 < min) { \ |
av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ |
obuf[i] = min; \ |
} else if (o0 > max) { \ |
av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ |
obuf[i] = max; \ |
} else { \ |
obuf[i] = o0; \ |
} \ |
} \ |
*in1 = i1; \ |
*in2 = i2; \ |
*out1 = o1; \ |
*out2 = o2; \ |
} |
|
BIQUAD_FILTER(s16, int16_t, INT16_MIN, INT16_MAX) |
BIQUAD_FILTER(s32, int32_t, INT32_MIN, INT32_MAX) |
BIQUAD_FILTER(flt, float, -1., 1.) |
BIQUAD_FILTER(dbl, double, -1., 1.) |
|
static int config_output(AVFilterLink *outlink) |
{ |
AVFilterContext *ctx = outlink->src; |
BiquadsContext *p = ctx->priv; |
AVFilterLink *inlink = ctx->inputs[0]; |
double A = exp(p->gain / 40 * log(10.)); |
double w0 = 2 * M_PI * p->frequency / inlink->sample_rate; |
double alpha; |
|
if (w0 > M_PI) { |
av_log(ctx, AV_LOG_ERROR, |
"Invalid frequency %f. Frequency must be less than half the sample-rate %d.\n", |
p->frequency, inlink->sample_rate); |
return AVERROR(EINVAL); |
} |
|
switch (p->width_type) { |
case NONE: |
alpha = 0.0; |
break; |
case HERTZ: |
alpha = sin(w0) / (2 * p->frequency / p->width); |
break; |
case OCTAVE: |
alpha = sin(w0) * sinh(log(2.) / 2 * p->width * w0 / sin(w0)); |
break; |
case QFACTOR: |
alpha = sin(w0) / (2 * p->width); |
break; |
case SLOPE: |
alpha = sin(w0) / 2 * sqrt((A + 1 / A) * (1 / p->width - 1) + 2); |
break; |
default: |
av_assert0(0); |
} |
|
switch (p->filter_type) { |
case biquad: |
break; |
case equalizer: |
p->a0 = 1 + alpha / A; |
p->a1 = -2 * cos(w0); |
p->a2 = 1 - alpha / A; |
p->b0 = 1 + alpha * A; |
p->b1 = -2 * cos(w0); |
p->b2 = 1 - alpha * A; |
break; |
case bass: |
p->a0 = (A + 1) + (A - 1) * cos(w0) + 2 * sqrt(A) * alpha; |
p->a1 = -2 * ((A - 1) + (A + 1) * cos(w0)); |
p->a2 = (A + 1) + (A - 1) * cos(w0) - 2 * sqrt(A) * alpha; |
p->b0 = A * ((A + 1) - (A - 1) * cos(w0) + 2 * sqrt(A) * alpha); |
p->b1 = 2 * A * ((A - 1) - (A + 1) * cos(w0)); |
p->b2 = A * ((A + 1) - (A - 1) * cos(w0) - 2 * sqrt(A) * alpha); |
break; |
case treble: |
p->a0 = (A + 1) - (A - 1) * cos(w0) + 2 * sqrt(A) * alpha; |
p->a1 = 2 * ((A - 1) - (A + 1) * cos(w0)); |
p->a2 = (A + 1) - (A - 1) * cos(w0) - 2 * sqrt(A) * alpha; |
p->b0 = A * ((A + 1) + (A - 1) * cos(w0) + 2 * sqrt(A) * alpha); |
p->b1 =-2 * A * ((A - 1) + (A + 1) * cos(w0)); |
p->b2 = A * ((A + 1) + (A - 1) * cos(w0) - 2 * sqrt(A) * alpha); |
break; |
case bandpass: |
if (p->csg) { |
p->a0 = 1 + alpha; |
p->a1 = -2 * cos(w0); |
p->a2 = 1 - alpha; |
p->b0 = sin(w0) / 2; |
p->b1 = 0; |
p->b2 = -sin(w0) / 2; |
} else { |
p->a0 = 1 + alpha; |
p->a1 = -2 * cos(w0); |
p->a2 = 1 - alpha; |
p->b0 = alpha; |
p->b1 = 0; |
p->b2 = -alpha; |
} |
break; |
case bandreject: |
p->a0 = 1 + alpha; |
p->a1 = -2 * cos(w0); |
p->a2 = 1 - alpha; |
p->b0 = 1; |
p->b1 = -2 * cos(w0); |
p->b2 = 1; |
break; |
case lowpass: |
if (p->poles == 1) { |
p->a0 = 1; |
p->a1 = -exp(-w0); |
p->a2 = 0; |
p->b0 = 1 + p->a1; |
p->b1 = 0; |
p->b2 = 0; |
} else { |
p->a0 = 1 + alpha; |
p->a1 = -2 * cos(w0); |
p->a2 = 1 - alpha; |
p->b0 = (1 - cos(w0)) / 2; |
p->b1 = 1 - cos(w0); |
p->b2 = (1 - cos(w0)) / 2; |
} |
break; |
case highpass: |
if (p->poles == 1) { |
p->a0 = 1; |
p->a1 = -exp(-w0); |
p->a2 = 0; |
p->b0 = (1 - p->a1) / 2; |
p->b1 = -p->b0; |
p->b2 = 0; |
} else { |
p->a0 = 1 + alpha; |
p->a1 = -2 * cos(w0); |
p->a2 = 1 - alpha; |
p->b0 = (1 + cos(w0)) / 2; |
p->b1 = -(1 + cos(w0)); |
p->b2 = (1 + cos(w0)) / 2; |
} |
break; |
case allpass: |
p->a0 = 1 + alpha; |
p->a1 = -2 * cos(w0); |
p->a2 = 1 - alpha; |
p->b0 = 1 - alpha; |
p->b1 = -2 * cos(w0); |
p->b2 = 1 + alpha; |
break; |
default: |
av_assert0(0); |
} |
|
p->a1 /= p->a0; |
p->a2 /= p->a0; |
p->b0 /= p->a0; |
p->b1 /= p->a0; |
p->b2 /= p->a0; |
|
p->cache = av_realloc_f(p->cache, sizeof(ChanCache), inlink->channels); |
if (!p->cache) |
return AVERROR(ENOMEM); |
memset(p->cache, 0, sizeof(ChanCache) * inlink->channels); |
|
switch (inlink->format) { |
case AV_SAMPLE_FMT_S16P: p->filter = biquad_s16; break; |
case AV_SAMPLE_FMT_S32P: p->filter = biquad_s32; break; |
case AV_SAMPLE_FMT_FLTP: p->filter = biquad_flt; break; |
case AV_SAMPLE_FMT_DBLP: p->filter = biquad_dbl; break; |
default: av_assert0(0); |
} |
|
return 0; |
} |
|
static int filter_frame(AVFilterLink *inlink, AVFrame *buf) |
{ |
BiquadsContext *p = inlink->dst->priv; |
AVFilterLink *outlink = inlink->dst->outputs[0]; |
AVFrame *out_buf; |
int nb_samples = buf->nb_samples; |
int ch; |
|
if (av_frame_is_writable(buf)) { |
out_buf = buf; |
} else { |
out_buf = ff_get_audio_buffer(inlink, nb_samples); |
if (!out_buf) |
return AVERROR(ENOMEM); |
av_frame_copy_props(out_buf, buf); |
} |
|
for (ch = 0; ch < av_frame_get_channels(buf); ch++) |
p->filter(buf->extended_data[ch], |
out_buf->extended_data[ch], nb_samples, |
&p->cache[ch].i1, &p->cache[ch].i2, |
&p->cache[ch].o1, &p->cache[ch].o2, |
p->b0, p->b1, p->b2, p->a1, p->a2); |
|
if (buf != out_buf) |
av_frame_free(&buf); |
|
return ff_filter_frame(outlink, out_buf); |
} |
|
static av_cold void uninit(AVFilterContext *ctx) |
{ |
BiquadsContext *p = ctx->priv; |
|
av_freep(&p->cache); |
} |
|
static const AVFilterPad inputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_AUDIO, |
.filter_frame = filter_frame, |
}, |
{ NULL } |
}; |
|
static const AVFilterPad outputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_AUDIO, |
.config_props = config_output, |
}, |
{ NULL } |
}; |
|
#define OFFSET(x) offsetof(BiquadsContext, x) |
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
|
#define DEFINE_BIQUAD_FILTER(name_, description_) \ |
AVFILTER_DEFINE_CLASS(name_); \ |
static av_cold int name_##_init(AVFilterContext *ctx) \ |
{ \ |
BiquadsContext *p = ctx->priv; \ |
p->class = &name_##_class; \ |
p->filter_type = name_; \ |
return init(ctx); \ |
} \ |
\ |
AVFilter avfilter_af_##name_ = { \ |
.name = #name_, \ |
.description = NULL_IF_CONFIG_SMALL(description_), \ |
.priv_size = sizeof(BiquadsContext), \ |
.init = name_##_init, \ |
.uninit = uninit, \ |
.query_formats = query_formats, \ |
.inputs = inputs, \ |
.outputs = outputs, \ |
.priv_class = &name_##_class, \ |
} |
|
#if CONFIG_EQUALIZER_FILTER |
static const AVOption equalizer_options[] = { |
{"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 999999, FLAGS}, |
{"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 999999, FLAGS}, |
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"}, |
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"}, |
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"}, |
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"}, |
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"}, |
{"width", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 999, FLAGS}, |
{"w", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 999, FLAGS}, |
{"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS}, |
{"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS}, |
{NULL} |
}; |
|
DEFINE_BIQUAD_FILTER(equalizer, "Apply two-pole peaking equalization (EQ) filter."); |
#endif /* CONFIG_EQUALIZER_FILTER */ |
#if CONFIG_BASS_FILTER |
static const AVOption bass_options[] = { |
{"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=100}, 0, 999999, FLAGS}, |
{"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=100}, 0, 999999, FLAGS}, |
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"}, |
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"}, |
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"}, |
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"}, |
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"}, |
{"width", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS}, |
{"w", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS}, |
{"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS}, |
{"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS}, |
{NULL} |
}; |
|
DEFINE_BIQUAD_FILTER(bass, "Boost or cut lower frequencies."); |
#endif /* CONFIG_BASS_FILTER */ |
#if CONFIG_TREBLE_FILTER |
static const AVOption treble_options[] = { |
{"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
{"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"}, |
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"}, |
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"}, |
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"}, |
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"}, |
{"width", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS}, |
{"w", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS}, |
{"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS}, |
{"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS}, |
{NULL} |
}; |
|
DEFINE_BIQUAD_FILTER(treble, "Boost or cut upper frequencies."); |
#endif /* CONFIG_TREBLE_FILTER */ |
#if CONFIG_BANDPASS_FILTER |
static const AVOption bandpass_options[] = { |
{"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
{"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"}, |
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"}, |
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"}, |
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"}, |
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"}, |
{"width", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 999, FLAGS}, |
{"w", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 999, FLAGS}, |
{"csg", "use constant skirt gain", OFFSET(csg), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS}, |
{NULL} |
}; |
|
DEFINE_BIQUAD_FILTER(bandpass, "Apply a two-pole Butterworth band-pass filter."); |
#endif /* CONFIG_BANDPASS_FILTER */ |
#if CONFIG_BANDREJECT_FILTER |
static const AVOption bandreject_options[] = { |
{"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
{"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"}, |
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"}, |
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"}, |
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"}, |
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"}, |
{"width", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 999, FLAGS}, |
{"w", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 999, FLAGS}, |
{NULL} |
}; |
|
DEFINE_BIQUAD_FILTER(bandreject, "Apply a two-pole Butterworth band-reject filter."); |
#endif /* CONFIG_BANDREJECT_FILTER */ |
#if CONFIG_LOWPASS_FILTER |
static const AVOption lowpass_options[] = { |
{"frequency", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=500}, 0, 999999, FLAGS}, |
{"f", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=500}, 0, 999999, FLAGS}, |
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"}, |
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"}, |
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"}, |
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"}, |
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"}, |
{"width", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS}, |
{"w", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS}, |
{"poles", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS}, |
{"p", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS}, |
{NULL} |
}; |
|
DEFINE_BIQUAD_FILTER(lowpass, "Apply a low-pass filter with 3dB point frequency."); |
#endif /* CONFIG_LOWPASS_FILTER */ |
#if CONFIG_HIGHPASS_FILTER |
static const AVOption highpass_options[] = { |
{"frequency", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
{"f", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"}, |
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"}, |
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"}, |
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"}, |
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"}, |
{"width", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS}, |
{"w", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS}, |
{"poles", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS}, |
{"p", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS}, |
{NULL} |
}; |
|
DEFINE_BIQUAD_FILTER(highpass, "Apply a high-pass filter with 3dB point frequency."); |
#endif /* CONFIG_HIGHPASS_FILTER */ |
#if CONFIG_ALLPASS_FILTER |
static const AVOption allpass_options[] = { |
{"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
{"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=HERTZ}, HERTZ, SLOPE, FLAGS, "width_type"}, |
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"}, |
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"}, |
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"}, |
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"}, |
{"width", "set filter-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=707.1}, 0, 99999, FLAGS}, |
{"w", "set filter-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=707.1}, 0, 99999, FLAGS}, |
{NULL} |
}; |
|
DEFINE_BIQUAD_FILTER(allpass, "Apply a two-pole all-pass filter."); |
#endif /* CONFIG_ALLPASS_FILTER */ |
#if CONFIG_BIQUAD_FILTER |
static const AVOption biquad_options[] = { |
{"a0", NULL, OFFSET(a0), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS}, |
{"a1", NULL, OFFSET(a1), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS}, |
{"a2", NULL, OFFSET(a2), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS}, |
{"b0", NULL, OFFSET(b0), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS}, |
{"b1", NULL, OFFSET(b1), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS}, |
{"b2", NULL, OFFSET(b2), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS}, |
{NULL} |
}; |
|
DEFINE_BIQUAD_FILTER(biquad, "Apply a biquad IIR filter with the given coefficients."); |
#endif /* CONFIG_BIQUAD_FILTER */ |