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/* -*- Mode: c++ -*- */
/***************************************************************************
* oss.cc
*
* Tue Apr 11 19:42:45 CET 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 "oss.h"
#include <sys/soundcard.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <iostream>
OSSOutputEngine::OSSOutputEngine()
: dev{"/dev/dsp"}
, num_channels{16}
, srate{44100}
, format{AFMT_S32_NE}
, data{}
, max_fragments{4}
, fragment_size{8}
{
data.clear();
data.resize(1024 * num_channels);
}
bool OSSOutputEngine::init(const Channels& channels)
{
int tmp, mode = O_WRONLY, fragments;
num_channels = channels.size();
if((fd = open(dev.data(), mode, 0)) == -1)
{
std::cerr << dev.data() << ' ' << std::strerror(errno) << std::endl;
return false;
}
fragments = max_fragments << 16 | fragment_size;
tmp = fragments;
if (ioctl(fd, SNDCTL_DSP_SETFRAGMENT, &tmp) == -1 || tmp != fragments)
{
perror("SNDCTL_DSP_SETFRAGMENT");
exit(-1);
}
tmp = format;
if(ioctl(fd, SNDCTL_DSP_SETFMT, &tmp) == -1 || tmp != format)
{
std::cerr << "Setting audio format failed " << std::strerror(errno);
std::cerr << std::endl;
return false;
}
tmp = num_channels;
if(ioctl(fd, SNDCTL_DSP_CHANNELS, &tmp) == -1 || tmp != num_channels)
{
std::cerr << "Can not set number of channels to " << num_channels;
std::cerr << ": " << std::strerror(errno) << std::endl;
return false;
}
tmp = srate;
if(ioctl(fd, SNDCTL_DSP_SPEED, &tmp) == -1 || tmp != srate)
{
std::cerr << "Can not set sampling frequency to " << srate << ": ";
std::cerr << std::strerror(errno) << std::endl;
return false;
}
return true;
}
void OSSOutputEngine::setParm(const std::string& parm, const std::string& value)
{
if(parm == "dev")
{
dev = value;
}
else if(parm == "srate")
{
try
{
srate = std::stoi(value);
}
catch(...)
{
std::cerr << "[OSSOutputEngine] Invalid samplerate ";
std::cerr << value << std::endl;
}
}
else if(parm == "max_fragments")
{
try
{
max_fragments = std::stoi(value);
}
catch(...)
{
std::cerr << "[OSSOutputEngine] Invalid max_fragments ";
std::cerr << value << std::endl;
}
if(max_fragments < 2)
{
std::cerr << "[OSSoutputEngine] max_fragments must be at least 2\n";
std::cerr << "Setting max_fragments to 2" << std::endl;
max_fragments = 2;
}
}
else if(parm == "fragment_size")
{
try
{
fragment_size = std::stoi(value);
}
catch(...)
{
std::cerr << "[OSSOutputEngine] Invalid fragment_size ";
std::cerr << value << std::endl;
}
if(fragment_size < 4)
{
std::cerr << "[OSSoutputEngine] fragment_size must be at least 4\n";
std::cerr << "Setting fragment_size to 4 (";
fragment_size = 4;
auto fragment_byte_size = 1 << fragment_size;
std::cerr << fragment_byte_size << "Bytes)" << std::endl;
}
}
else
{
std::cerr << "[OSSOutputEngine] Unsupported parameter '";
std::cerr << parm << std::endl;
}
}
void OSSOutputEngine::pre(size_t nsamples)
{
data.resize(nsamples * num_channels);
}
void OSSOutputEngine::run(int ch, sample_t* samples, size_t nsamples)
{
// Convert to int format and
// write channel data in interleaved buffer
std::int32_t sample;
for(size_t i = 0; i < nsamples; ++i)
{
// Hard clip if needed
if(samples[i] > 1)
{
sample = INT32_MAX;
}
else if(samples[i] < -1)
{
sample = -INT32_MAX;
}
else
{
sample = samples[i] * INT32_MAX;
}
data[i * num_channels + ch] = sample;
}
}
void OSSOutputEngine::post(size_t nsamples)
{
auto data_size = data.size() * sizeof(*data.data());
auto size_written = write(fd, data.data(), data_size);
if(size_written != data_size)
{
std::cerr << "Audio write: " << std::strerror(errno) << std::endl;
}
}
std::size_t OSSOutputEngine::getBufferSize() const
{
return data.size() / num_channels;
}
std::size_t OSSOutputEngine::getSamplerate() const
{
return srate;
}
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