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/*
Copyright (C) 2001 Robert Lunnon
[email protected]
Copyright (C) 2001 Stefan Westerfeld
[email protected]
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
/**
* only compile 'LibAudioIO' AudioIO class if libaudio was detected during
* configure
*/
#ifdef HAVE_LIBAUDIOIO
#include <libaudioio.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h> // Needed on some systems.
#endif
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <iostream>
#include <algorithm>
#include "debug.h"
#include "audioio.h"
namespace Arts {
class AudioIOLibAudioIO : public AudioIO {
protected:
int audio_fd;
int requestedFragmentSize;
int requestedFragmentCount;
SampleSpec_t spec;
public:
AudioIOLibAudioIO();
void setParam(AudioParam param, int& value);
int getParam(AudioParam param);
bool open();
void close();
int read(void *buffer, int size);
int write(void *buffer, int size);
};
REGISTER_AUDIO_IO(AudioIOLibAudioIO,"libaudioio"," Portable Audio Library");
};
using namespace std;
using namespace Arts;
AudioIOLibAudioIO::AudioIOLibAudioIO()
{
/*
* default parameters
*/
param(samplingRate) = spec.rate=44100;
paramStr(deviceName) = "/dev/Audio";
requestedFragmentSize = param(fragmentSize) = 4096;
requestedFragmentCount =spec.max_blocks= param(fragmentCount) = 7;
param(channels) = spec.channels=2;
param(direction) = 2;
}
bool AudioIOLibAudioIO::open()
{
string& _error = paramStr(lastError);
string& _deviceName = paramStr(deviceName);
int& _channels = param(channels);
int& _fragmentSize = param(fragmentSize);
int& _fragmentCount = param(fragmentCount);
int& _samplingRate = param(samplingRate);
int& _format = param(format);
int mode;
spec.channels=_channels;
spec.max_blocks= param(fragmentCount);
spec.rate= _samplingRate;
spec.encoding= ENCODE_PCM;
spec.precision=16 ;
spec.endian=ENDIAN_NATURAL;
spec.disable_threads=1;
if(param(direction) == 3)
mode = O_RDWR|O_NDELAY;
else if(param(direction) == 2)
mode = O_WRONLY|O_NDELAY;
else
{
_error = "invalid direction";
return false;
}
audio_fd = ::AudioIOOpenX( mode, &spec,&spec );
if(audio_fd == -1)
{
_error = "device ";
_error += _deviceName.c_str();
_error += " can't be opened (";
_error += strerror(errno);
_error += ")";
return false;
}
/*
* since we use spec.endian=ENDIAN_NATURAL we'll have little endian audio
* on little endian machines and big endian audio on big endian machines:
*/
#ifdef WORDS_BIGENDIAN
_format = 17;
#else
_format = 16;
#endif
spec.channels=_channels;
spec.rate = _samplingRate;
_fragmentSize = requestedFragmentSize;
spec.max_blocks=_fragmentCount = requestedFragmentCount;
artsdebug("buffering: %d fragments with %d bytes "
"(audio latency is %1.1f ms)", _fragmentCount, _fragmentSize,
(float)(_fragmentSize*_fragmentCount) /
(float)(2.0 * _samplingRate * _channels)*1000.0);
return(true);
}
void AudioIOLibAudioIO::close()
{
::AudioIOClose();
}
void AudioIOLibAudioIO::setParam(AudioParam p, int& value)
{
switch(p)
{
case fragmentSize:
param(p) = requestedFragmentSize = value;
break;
case fragmentCount:
param(p) = requestedFragmentCount = value;
break;
default:
param(p) = value;
break;
}
}
int AudioIOLibAudioIO::getParam(AudioParam p)
{
switch(p)
{
case canRead:
return AudioIOCheckRead();
break;
case canWrite:
return (AudioIOCheckWriteReady()) ? (16*1024) : 0;
// Assume if writable can write 16K
// Arts Really doesn't care
break;
case selectReadFD:
return (param(direction) & directionRead)?audio_fd:-1;
break;
case selectWriteFD:
return (param(direction) & directionWrite)?audio_fd:-1;
break;
case autoDetect:
/*
* if there is a "native" aRts driver, we'll rather use this
* than the generic libaudioio one, because the native one
* is likely to be better optimized to the needs of aRts than
* a generic driver, so keep the value small
*/
return 3;
break;
default:
return param(p);
break;
}
}
int AudioIOLibAudioIO::read(void *buffer, int size)
{
arts_assert(audio_fd != 0);
return ::AudioIORead(buffer,size);
}
int AudioIOLibAudioIO::write(void *buffer, int size)
{
arts_assert(audio_fd != 0);
return ::AudioIOWrite(buffer,size);
}
#endif
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