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117 lines
2.6 KiB
C++
117 lines
2.6 KiB
C++
/***
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This file is part of snapcast
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Copyright (C) 2014-2018 Johannes Pohl
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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 3 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <iostream>
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#include <cmath>
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#include "player.h"
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#include "aixlog.hpp"
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using namespace std;
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Player::Player(const PcmDevice& pcmDevice, std::shared_ptr<Stream> stream) :
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active_(false),
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stream_(stream),
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pcmDevice_(pcmDevice),
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volume_(1.0),
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muted_(false),
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volCorrection_(1.0)
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{
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}
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void Player::start()
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{
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active_ = true;
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playerThread_ = thread(&Player::worker, this);
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}
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Player::~Player()
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{
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stop();
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}
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void Player::stop()
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{
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if (active_)
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{
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active_ = false;
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playerThread_.join();
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}
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}
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void Player::adjustVolume(char* buffer, size_t frames)
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{
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double volume = volume_;
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if (muted_)
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volume = 0.;
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const SampleFormat& sampleFormat = stream_->getFormat();
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if ((volume < 1.0) || (volCorrection_ != 1.))
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{
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volume *= volCorrection_;
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if (sampleFormat.sampleSize == 1)
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adjustVolume<int8_t>(buffer, frames*sampleFormat.channels, volume);
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else if (sampleFormat.sampleSize == 2)
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adjustVolume<int16_t>(buffer, frames*sampleFormat.channels, volume);
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else if (sampleFormat.sampleSize == 4)
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adjustVolume<int32_t>(buffer, frames*sampleFormat.channels, volume);
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}
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}
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//https://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/pulse/volume.c#n260
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//http://www.robotplanet.dk/audio/audio_gui_design/
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//https://lists.linuxaudio.org/pipermail/linux-audio-dev/2009-May/thread.html#22198
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void Player::setVolume_poly(double volume, double exp)
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{
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volume_ = std::pow(volume, exp);
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LOG(DEBUG) << "setVolume poly: " << volume << " => " << volume_ << "\n";
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}
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//http://stackoverflow.com/questions/1165026/what-algorithms-could-i-use-for-audio-volume-level
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void Player::setVolume_exp(double volume, double base)
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{
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// double base = M_E;
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// double base = 10.;
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volume_ = (pow(base, volume)-1) / (base-1);
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LOG(DEBUG) << "setVolume exp: " << volume << " => " << volume_ << "\n";
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}
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void Player::setVolume(double volume)
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{
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setVolume_exp(volume, 10.);
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}
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void Player::setMute(bool mute)
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{
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muted_ = mute;
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}
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