171 lines
3.7 KiB
Plaintext
171 lines
3.7 KiB
Plaintext
/*
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* This file is part of sidplayfp, a console SID player.
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*
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* Copyright 2000-2002 Simon White
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*
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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 2 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "audiodrv.h"
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#ifdef HAVE_OSS
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <new>
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#if defined(HAVE_NETBSD)
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const char Audio_OSS::AUDIODEVICE[] = "/dev/audio";
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#else
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const char Audio_OSS::AUDIODEVICE[] = "/dev/dsp";
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#endif
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Audio_OSS::Audio_OSS() :
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AudioBase("OSS")
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{
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// Reset everything.
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outOfOrder();
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}
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Audio_OSS::~Audio_OSS ()
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{
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close ();
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}
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void Audio_OSS::outOfOrder ()
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{
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// Reset everything.
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clearError();
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_audiofd = -1;
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}
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bool Audio_OSS::open (AudioConfig &cfg)
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{
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if (_audiofd != -1)
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{
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setError("Device already in use");
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return false;
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}
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try
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{
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if (access (AUDIODEVICE, W_OK) == -1)
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{
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throw error("Could not locate an audio device.");
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}
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if ((_audiofd = ::open (AUDIODEVICE, O_WRONLY, 0)) == (-1))
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{
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throw error("Could not open audio device.");
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}
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int format = AFMT_S16_LE;
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if (ioctl (_audiofd, SNDCTL_DSP_SETFMT, &format) == (-1))
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{
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throw error("Could not set sample format.");
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}
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// Set mono/stereo.
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if (ioctl (_audiofd, SNDCTL_DSP_CHANNELS, &cfg.channels) == (-1))
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{
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throw error("Could not set mono/stereo.");
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}
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// Verify and accept the number of channels the driver accepted.
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switch (cfg.channels)
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{
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case 1:
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case 2:
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break;
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default:
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throw error("Could not set mono/stereo.");
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break;
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}
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// Set frequency.
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if (ioctl (_audiofd, SNDCTL_DSP_SPEED, &cfg.frequency) == (-1))
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{
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throw error("Could not set frequency.");
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}
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int temp = 0;
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ioctl (_audiofd, SNDCTL_DSP_GETBLKSIZE, &temp);
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cfg.bufSize = (uint_least32_t) temp;
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try
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{
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_sampleBuffer = new short[cfg.bufSize];
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}
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catch (std::bad_alloc const &ba)
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{
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throw error("Unable to allocate memory for sample buffers.");
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}
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// Setup internal Config
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_settings = cfg;
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return true;
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}
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catch(error const &e)
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{
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setError(e.message());
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if (_audiofd != -1)
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{
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close ();
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_audiofd = -1;
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}
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perror (AUDIODEVICE);
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return false;
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}
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}
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// Close an opened audio device, free any allocated buffers and
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// reset any variables that reflect the current state.
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void Audio_OSS::close ()
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{
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if (_audiofd != -1)
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{
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::close (_audiofd);
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delete [] _sampleBuffer;
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outOfOrder ();
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}
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}
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void Audio_OSS::reset ()
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{
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if (_audiofd != -1)
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{
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ioctl (_audiofd, SNDCTL_DSP_RESET, 0);
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}
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}
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bool Audio_OSS::write ()
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{
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if (_audiofd == -1)
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{
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setError("Device not open.");
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return false;
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}
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::write (_audiofd, _sampleBuffer, 2 * _settings.bufSize);
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return true;
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}
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#endif // HAVE_OSS
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