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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* wavfile.cc
*
* Mi 20. Jan 16:57:16 CET 2016
* Copyright 2016 Christian Glöckner
* cgloeckner@freenet.de
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo 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 3 of the License, or
* (at your option) any later version.
*
* DrumGizmo 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 DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <iostream>
#include "wavfile.h"
WavfileOutputEngine::WavfileOutputEngine()
: AudioOutputEngine{}
, info{}
, channels{}
, file{"output"}
, latency{0}
{
info.samplerate = 44100;
info.channels = 1;
info.format = SF_FORMAT_WAV | SF_FORMAT_FLOAT;
}
WavfileOutputEngine::~WavfileOutputEngine()
{
for(auto& ptr : channels)
{
if(ptr != nullptr)
{
sf_close(ptr);
}
}
}
bool WavfileOutputEngine::init(const Channels& data)
{
channels.clear();
channels.resize(data.size()); // value-initialized with null
for(auto i = 0u; i < data.size(); ++i)
{
// write channel to file
auto fname = file + data[i].name + "-" + std::to_string(i) + ".wav";
channels[i] = sf_open(fname.c_str(), SFM_WRITE, &info);
if(channels[i] == nullptr)
{
std::cerr << "[WaffileOutputEngine] Failed to initialize "
<< "channel #" << i << "\n";
return false;
}
}
return true;
}
void WavfileOutputEngine::setParm(const std::string& parm,
const std::string& value)
{
if(parm == "file")
{
// apply output filename prefix
file = value;
}
else if(parm == "srate")
{
// try to apply samplerate
try
{
info.samplerate = std::stoi(value);
}
catch(...)
{
std::cerr << "[WavfileOutputEngine] Invalid samplerate " << value
<< "\n";
}
}
else
{
std::cerr << "[WavfileOutputEngine] Unsupported parameter '" << parm
<< "'\n";
}
}
bool WavfileOutputEngine::start()
{
return true;
}
void WavfileOutputEngine::stop()
{
}
void WavfileOutputEngine::pre(std::size_t nsamples)
{
}
void WavfileOutputEngine::run(int ch, sample_t* samples, std::size_t nsamples)
{
if(static_cast<unsigned int>(ch) >= channels.size())
{
std::cerr << "[WavfileOutputEngine] cannot access channel #" << ch
<< " (" << channels.size() << " channels available)\n";
return;
}
// Skip the initial 'latency' samples.
if(nsamples <= latency)
{
return;
}
nsamples -= latency;
sf_writef_float(channels[ch], samples + latency, nsamples);
}
void WavfileOutputEngine::post(std::size_t nsamples)
{
if(latency > nsamples)
{
latency -= nsamples;
}
else
{
latency = 0;
}
}
std::size_t WavfileOutputEngine::getSamplerate() const
{
return info.samplerate;
}
void WavfileOutputEngine::onLatencyChange(std::size_t latency)
{
this->latency = latency;
}
bool WavfileOutputEngine::isFreewheeling() const
{
return true;
}
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