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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* jackaudio.cc
*
* Fr 22. Jan 09:43:30 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 <cassert>
#include <iostream>
#include "jackaudio.h"
JackAudioOutputEngine::JackAudioOutputEngine(JackClient& client)
: AudioOutputEngine{}
, client(client)
, channels{}
, latency{0}
{
client.add(*this);
}
JackAudioOutputEngine::~JackAudioOutputEngine()
{
client.remove(*this);
}
bool JackAudioOutputEngine::init(const Channels& data)
{
channels.clear();
channels.reserve(data.size());
auto i = 0u;
auto const buffer_size = getBufferSize();
for(auto const& elem : data)
{
auto name = std::to_string(i) + "-" + elem.name;
// initialize new channel
channels.emplace_back(client, name, buffer_size);
if(channels.back().port.port == nullptr)
{
std::cerr << "[JackAudioOutputEngine] Cannot create jack "
<< "port for channel #" << i << "\n";
return false;
}
++i;
}
return true;
}
void JackAudioOutputEngine::setParm(const std::string& parm, const std::string& value)
{
}
bool JackAudioOutputEngine::start()
{
client.activate();
return true;
}
void JackAudioOutputEngine::stop()
{
}
void JackAudioOutputEngine::pre(size_t nsamples)
{
}
void JackAudioOutputEngine::run(int ch, sample_t* samples, size_t nsamples)
{
for(auto i = 0u; i < nsamples; ++i)
{
channels[ch].samples[i] = samples[i];
}
}
void JackAudioOutputEngine::post(size_t nsamples)
{
sema.wait();
}
void JackAudioOutputEngine::process(jack_nframes_t num_frames)
{
assert(num_frames == getBufferSize());
for(auto& channel : channels)
{
auto ptr = static_cast<jack_default_audio_sample_t*>(jack_port_get_buffer(channel.port.port, num_frames));
for(auto i = 0u; i < num_frames; ++i)
{
ptr[i] = channel.samples[i];
}
}
sema.post();
}
size_t JackAudioOutputEngine::getBufferSize() const
{
return client.getBufferSize();
}
size_t JackAudioOutputEngine::getSamplerate() const
{
return client.getSampleRate();
}
void JackAudioOutputEngine::onLatencyChange(std::size_t latency)
{
this->latency = latency;
}
JackAudioOutputEngine::Channel::Channel(JackClient& client,
const std::string& name,
std::size_t buffer_size)
: port{client, name, JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput}
, samples{}
{
samples.resize(buffer_size);
}
void JackAudioOutputEngine::jackLatencyCallback(jack_latency_callback_mode_t mode)
{
jack_latency_range_t range;
switch(mode)
{
case JackCaptureLatency:
// We do not have any audio input ports. Use this for when we do...
// jack_port_get_latency_range(port_feeding_input_port,
// JackPlaybackLatency,
// &range);
// range.min += 0;
// range.max += 0;
// jack_port_set_latency_range(input_port, JackPlaybackLatency, &range);
break;
case JackPlaybackLatency:
for(auto& channel : channels)
{
jack_port_get_latency_range(channel.port.port,
JackPlaybackLatency,
&range);
range.min += latency;
range.max += latency;
jack_port_set_latency_range(channel.port.port,
JackPlaybackLatency,
&range);
}
break;
}
}
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