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https://github.com/FFmpeg/FFmpeg.git
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790f793844
There are lots of files that don't need it: The number of object files that actually need it went down from 2011 to 884 here. Keep it for external users in order to not cause breakages. Also improve the other headers a bit while just at it. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
253 lines
8.2 KiB
C
253 lines
8.2 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/channel_layout.h"
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#include "libavutil/ffmath.h"
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#include "libavutil/mem.h"
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#include "libavutil/opt.h"
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#include "avfilter.h"
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#include "audio.h"
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typedef struct ASubBoostContext {
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const AVClass *class;
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double dry_gain;
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double wet_gain;
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double feedback;
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double max_boost;
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double decay;
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double delay;
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double cutoff;
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double slope;
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double a0, a1, a2;
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double b0, b1, b2;
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char *ch_layout_str;
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AVChannelLayout ch_layout;
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int *write_pos;
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int buffer_samples;
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AVFrame *w;
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AVFrame *buffer;
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} ASubBoostContext;
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static int get_coeffs(AVFilterContext *ctx)
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{
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ASubBoostContext *s = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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double w0 = 2 * M_PI * s->cutoff / inlink->sample_rate;
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double alpha = sin(w0) / 2 * sqrt(2. * (1. / s->slope - 1.) + 2.);
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s->a0 = 1 + alpha;
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s->a1 = -2 * cos(w0);
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s->a2 = 1 - alpha;
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s->b0 = (1 - cos(w0)) / 2;
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s->b1 = 1 - cos(w0);
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s->b2 = (1 - cos(w0)) / 2;
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s->a1 /= s->a0;
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s->a2 /= s->a0;
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s->b0 /= s->a0;
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s->b1 /= s->a0;
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s->b2 /= s->a0;
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s->buffer_samples = inlink->sample_rate * s->delay / 1000;
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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ASubBoostContext *s = ctx->priv;
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s->buffer = ff_get_audio_buffer(inlink, inlink->sample_rate / 10);
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s->w = ff_get_audio_buffer(inlink, 3);
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s->write_pos = av_calloc(inlink->ch_layout.nb_channels, sizeof(*s->write_pos));
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if (!s->buffer || !s->w || !s->write_pos)
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return AVERROR(ENOMEM);
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return get_coeffs(ctx);
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}
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typedef struct ThreadData {
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AVFrame *in, *out;
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} ThreadData;
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static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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{
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ASubBoostContext *s = ctx->priv;
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ThreadData *td = arg;
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AVFrame *out = td->out;
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AVFrame *in = td->in;
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const double mix = ctx->is_disabled ? 0. : 1.;
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const double wet = ctx->is_disabled ? 1. : s->wet_gain;
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const double dry = ctx->is_disabled ? 1. : s->dry_gain;
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const double feedback = s->feedback, decay = s->decay;
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const double max_boost = s->max_boost;
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const double b0 = s->b0;
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const double b1 = s->b1;
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const double b2 = s->b2;
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const double a1 = -s->a1;
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const double a2 = -s->a2;
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const int start = (in->ch_layout.nb_channels * jobnr) / nb_jobs;
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const int end = (in->ch_layout.nb_channels * (jobnr+1)) / nb_jobs;
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const int buffer_samples = s->buffer_samples;
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for (int ch = start; ch < end; ch++) {
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const double *src = (const double *)in->extended_data[ch];
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double *dst = (double *)out->extended_data[ch];
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double *buffer = (double *)s->buffer->extended_data[ch];
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double *w = (double *)s->w->extended_data[ch];
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int write_pos = s->write_pos[ch];
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enum AVChannel channel = av_channel_layout_channel_from_index(&in->ch_layout, ch);
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const int bypass = av_channel_layout_index_from_channel(&s->ch_layout, channel) < 0;
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const double a = 0.00001;
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const double b = 1. - a;
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if (bypass) {
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if (in != out)
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memcpy(out->extended_data[ch], in->extended_data[ch],
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in->nb_samples * sizeof(double));
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continue;
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}
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for (int n = 0; n < in->nb_samples; n++) {
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double out_sample, boost;
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out_sample = src[n] * b0 + w[0];
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w[0] = b1 * src[n] + w[1] + a1 * out_sample;
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w[1] = b2 * src[n] + a2 * out_sample;
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buffer[write_pos] = buffer[write_pos] * decay + out_sample * feedback;
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boost = av_clipd((1. - (fabs(src[n] * dry))) / fabs(buffer[write_pos]), 0., max_boost);
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w[2] = boost > w[2] ? w[2] * b + a * boost : w[2] * a + b * boost;
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w[2] = av_clipd(w[2], 0., max_boost);
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dst[n] = (src[n] * dry + w[2] * buffer[write_pos] * mix) * wet;
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if (++write_pos >= buffer_samples)
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write_pos = 0;
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}
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s->write_pos[ch] = write_pos;
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}
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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ASubBoostContext *s = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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ThreadData td;
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AVFrame *out;
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int ret;
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ret = av_channel_layout_copy(&s->ch_layout, &inlink->ch_layout);
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if (ret < 0)
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return ret;
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if (strcmp(s->ch_layout_str, "all"))
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av_channel_layout_from_string(&s->ch_layout,
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s->ch_layout_str);
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if (av_frame_is_writable(in)) {
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out = in;
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} else {
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out = ff_get_audio_buffer(outlink, in->nb_samples);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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}
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td.in = in; td.out = out;
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ff_filter_execute(ctx, filter_channels, &td, NULL,
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FFMIN(inlink->ch_layout.nb_channels, ff_filter_get_nb_threads(ctx)));
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if (out != in)
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av_frame_free(&in);
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return ff_filter_frame(outlink, out);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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ASubBoostContext *s = ctx->priv;
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av_channel_layout_uninit(&s->ch_layout);
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av_frame_free(&s->buffer);
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av_frame_free(&s->w);
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av_freep(&s->write_pos);
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}
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static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
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char *res, int res_len, int flags)
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{
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int ret;
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ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
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if (ret < 0)
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return ret;
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return get_coeffs(ctx);
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}
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#define OFFSET(x) offsetof(ASubBoostContext, x)
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
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static const AVOption asubboost_options[] = {
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{ "dry", "set dry gain", OFFSET(dry_gain), AV_OPT_TYPE_DOUBLE, {.dbl=1.0}, 0, 1, FLAGS },
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{ "wet", "set wet gain", OFFSET(wet_gain), AV_OPT_TYPE_DOUBLE, {.dbl=1.0}, 0, 1, FLAGS },
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{ "boost", "set max boost",OFFSET(max_boost),AV_OPT_TYPE_DOUBLE, {.dbl=2.0}, 1, 12, FLAGS },
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{ "decay", "set decay", OFFSET(decay), AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, 0, 1, FLAGS },
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{ "feedback", "set feedback", OFFSET(feedback), AV_OPT_TYPE_DOUBLE, {.dbl=0.9}, 0, 1, FLAGS },
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{ "cutoff", "set cutoff", OFFSET(cutoff), AV_OPT_TYPE_DOUBLE, {.dbl=100}, 50, 900, FLAGS },
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{ "slope", "set slope", OFFSET(slope), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0.0001, 1, FLAGS },
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{ "delay", "set delay", OFFSET(delay), AV_OPT_TYPE_DOUBLE, {.dbl=20}, 1, 100, FLAGS },
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{ "channels", "set channels to filter", OFFSET(ch_layout_str), AV_OPT_TYPE_STRING, {.str="all"}, 0, 0, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(asubboost);
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static const AVFilterPad inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_frame = filter_frame,
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.config_props = config_input,
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},
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};
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const AVFilter ff_af_asubboost = {
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.name = "asubboost",
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.description = NULL_IF_CONFIG_SMALL("Boost subwoofer frequencies."),
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.priv_size = sizeof(ASubBoostContext),
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.priv_class = &asubboost_class,
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.uninit = uninit,
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FILTER_INPUTS(inputs),
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FILTER_OUTPUTS(ff_audio_default_filterpad),
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FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBLP),
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.process_command = process_command,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
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AVFILTER_FLAG_SLICE_THREADS,
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};
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