117 lines
3.1 KiB
C++
117 lines
3.1 KiB
C++
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/*
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* Copyright (C) 2020 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "audiographer/general/demo_noise.h"
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#include "ardour/dB.h"
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using namespace AudioGrapher;
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DemoNoiseAdder::DemoNoiseAdder (unsigned int channels)
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: _data_out (0)
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, _data_out_size (0)
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, _channels (channels)
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, _interval (48000 * 20)
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, _duration (48000)
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, _level (.1) // -20dBFS
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, _pos (48000 * 5)
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, _rseed (1)
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{
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}
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DemoNoiseAdder::~DemoNoiseAdder ()
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{
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delete[] _data_out;
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}
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void
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DemoNoiseAdder::init (samplecnt_t max_samples, samplecnt_t interval, samplecnt_t duration, float level)
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{
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if (max_samples > _data_out_size) {
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delete[] _data_out;
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_data_out = new float[max_samples];
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_data_out_size = max_samples;
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}
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if (_duration <= 0) {
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_duration = 48000;
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}
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if (duration > interval) {
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_duration = std::min ((samplecnt_t)48000, interval / 5);
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} else {
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_duration = duration;
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}
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_interval = interval;
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_level = dB_to_coefficient (level);
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_pos = interval / 5 + duration;
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}
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void
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DemoNoiseAdder::process (ProcessContext<float> const& ctx)
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{
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const samplecnt_t n_samples = ctx.samples_per_channel ();
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if (throw_level (ThrowStrict) && ctx.channels () != _channels) {
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throw Exception (*this, boost::str (boost::format ("Wrong channel count given to process(), %1% instead of %2%") % ctx.channels () % _channels));
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}
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if (throw_level (ThrowProcess) && ctx.samples () > _data_out_size) {
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throw Exception (*this, boost::str (boost::format ("Too many samples given to process(), %1% instead of %2%") % ctx.samples () % _data_out_size));
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}
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if (_pos + n_samples > _duration) {
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_pos -= n_samples;
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ListedSource<float>::output (ctx);
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return;
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}
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assert (ctx.samples () % ctx.channels () == 0);
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assert (ctx.samples () == n_samples * _channels);
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memcpy (_data_out, ctx.data (), sizeof (float) * n_samples * _channels);
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// TODO: optimize, single loop
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float* d = _data_out;
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for (samplecnt_t s = 0; s < n_samples; ++s) {
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for (unsigned int c = 0; c < _channels; ++c, ++d) {
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if (_pos <= _duration) {
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*d += _level * randf ();
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}
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}
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if (--_pos == 0) {
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_pos += _interval;
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break;
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}
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}
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ProcessContext<float> ctx_out (ctx, _data_out);
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this->output (ctx_out);
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}
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inline uint32_t
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DemoNoiseAdder::randi ()
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{
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// 31bit Park-Miller-Carta Pseudo-Random Number Generator
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uint32_t hi, lo;
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lo = 16807 * (_rseed & 0xffff);
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hi = 16807 * (_rseed >> 16);
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lo += (hi & 0x7fff) << 16;
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lo += hi >> 15;
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lo = (lo & 0x7fffffff) + (lo >> 31);
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return (_rseed = lo);
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}
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