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/* -*- Mode: c++ -*- */
/***************************************************************************
* ossmidi.cc
*
* Sun May 21 10:52:09 CEST 2017
* Copyright 2017 Goran Mekić
* meka@tilda.center
****************************************************************************/
/*
* 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 "ossmidi.h"
#include <sys/soundcard.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <iostream>
static int const NOTE_ON = 0x90;
static int const NOTE_MASK = 0xF0;
OSSInputEngine::OSSInputEngine()
: AudioInputEngineMidi{}
, dev{"/dev/midi"}
{
}
OSSInputEngine::~OSSInputEngine()
{
}
bool OSSInputEngine::init(const Instruments& instruments)
{
if(!loadMidiMap(midimap_file, instruments))
{
std::cerr << "[OSSInputEngine] Failed to parse midimap '"
<< midimap_file << std::endl;
return false;
}
if ((fd = open(dev.data(), O_RDONLY | O_NONBLOCK, 0)) == -1)
{
std::cerr << dev.data() << ' ' << std::strerror(errno) << std::endl;
return false;
}
return true;
}
void OSSInputEngine::setParm(const std::string& parm, const std::string& value)
{
if(parm == "dev")
{
dev = value;
}
else if(parm == "midimap")
{
midimap_file = value;
}
}
bool OSSInputEngine::start()
{
return true;
}
void OSSInputEngine::stop()
{
}
void OSSInputEngine::pre()
{
events.clear();
}
void OSSInputEngine::run(size_t pos, size_t len, std::vector<event_t>& events)
{
int l;
unsigned char buf[128];
if ((l = read (fd, buf, sizeof (buf))) != -1)
{
int masked_note = buf[0] & NOTE_MASK;
if (masked_note == NOTE_ON) {
int note = buf[1];
int velocity = buf[2];
event_t event;
event.instrument = mmap.lookup(note);
if(event.instrument != -1)
{
event.velocity = velocity / 127.0;
event.type = 0;
event.offset = 0;
events.push_back(event);
}
}
} else if (errno != EAGAIN) {
std::cerr << "Error code: " << errno << std::endl;
std::cerr << std::strerror(errno) << std::endl;
}
}
void OSSInputEngine::post()
{
}
bool OSSInputEngine::isFreewheeling() const
{
return false;
}
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