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+ /*
+
+ Copyright (C) 2001 Robert Lunnon
+ bob@yarrabee.net.au
+ Copyright (C) 2001 Stefan Westerfeld
+ stefan@space.twc.de
+
+ 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