1 files changed, 274 insertions, 0 deletions
diff --git a/flow/audioiosgi.cpp b/flow/audioiosgi.cpp
new file mode 100644
index 0000000..72e1782
--- /dev/null
+++ b/flow/audioiosgi.cpp
@@ -0,0 +1,274 @@
+    /*
+
+    Copyright (C) 2001 Carsten Kroll
+                       ckroll@pinnaclesys.com
+
+    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 'sgi' AudioIO class if compiled under IRIX
+ */
+#ifdef HAVE_IRIX
+
+#include <dmedia/audio.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 AudioIOSGI : public AudioIO {
+protected:
+	int requestedFragmentSize;
+	int requestedFragmentCount;
+	ALport audio_port,audio_port1;
+	ALconfig audioconfig;
+	int framesz;
+
+public:
+	AudioIOSGI();
+
+	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(AudioIOSGI,"sgi","SGI dmedia Audio I/O");
+};
+
+using namespace std;
+using namespace Arts;
+
+AudioIOSGI::AudioIOSGI()
+{
+	/*
+	 * default parameters
+	 */
+	param(samplingRate) = 44100;
+	paramStr(deviceName) = "audioio";
+	requestedFragmentSize = param(fragmentSize) = 4096;
+	requestedFragmentCount = param(fragmentCount) = 10;
+	audio_port=0;
+	audio_port1=0;
+	param(format)=17;
+	param(channels) = 2;
+	param(direction) = 2;
+}
+
+bool AudioIOSGI::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& _direction = param(direction);
+	int err;
+
+	if(_direction != 3  && _direction != 2){
+		_error = "invalid direction";
+		return false;
+	}
+	framesz=((_format & ~1) >> 3) * _channels;
+
+	audioconfig = alNewConfig();
+	alSetSampFmt(audioconfig,AL_SAMPFMT_TWOSCOMP);
+
+	alSetWidth(audioconfig, _format==8 ? AL_SAMPLE_8 : _format==16 || _format==17 ? AL_SAMPLE_16 : AL_SAMPLE_24);
+	alSetQueueSize(audioconfig,(requestedFragmentSize * requestedFragmentCount) / framesz);
+	alSetChannels(audioconfig,_channels);
+
+	audio_port = alOpenPort("out","w",audioconfig);
+
+
+	if (audio_port == (ALport) 0 ) {
+		err = oserror();
+		if (err == AL_BAD_NO_PORTS) {
+			_error = "System is out of audio ports";
+		} else if (err == AL_BAD_DEVICE_ACCESS) {
+			_error = "Couldn't access audio device";
+		} else if (err == AL_BAD_OUT_OF_MEM) {
+			_error = "Out of memory";
+		}
+		close();
+		return false;
+	}
+	if (_direction == 3){
+		audio_port1  = alOpenPort("in","r",audioconfig);
+		if (audio_port1 == (ALport) 0 ) {
+			err = oserror();
+			if (err == AL_BAD_NO_PORTS) {
+				_error = "System is out of audio ports";
+			} else if (err == AL_BAD_DEVICE_ACCESS) {
+				_error = "Couldn't access audio device";
+			} else if (err == AL_BAD_OUT_OF_MEM) {
+				_error = "Out of memory";
+			}
+			close();
+			return false;
+		}
+	}
+	/*
+	 * Attempt to set a crystal-based sample-rate on the
+	 * given device.
+	 */
+	ALpv x[2];
+	x[0].param = AL_MASTER_CLOCK;
+	x[0].value.i = AL_CRYSTAL_MCLK_TYPE;
+	x[1].param = AL_RATE;
+	x[1].value.ll = alDoubleToFixed(double(_samplingRate));
+	if (alSetParams(alGetResource(audio_port),x, 2)<0) {
+		_error="setparams failed: ";
+		_error+=alGetErrorString(oserror());
+		close();
+		return false;
+	}
+	if (_direction == 3)
+		if (alSetParams(alGetResource(audio_port1),x, 2)<0) {
+			_error="setparams failed: ";
+			_error+=alGetErrorString(oserror());
+			close();
+			return false;
+		}
+	if (x[1].sizeOut < 0) {
+		_error="rate was invalid";
+		close();
+		return false;
+	}
+
+	alSetFillPoint(audio_port,(alGetQueueSize(audioconfig)*5)/10) ;//50 %
+	if (_direction == 3)
+		alSetFillPoint(audio_port1,(alGetQueueSize(audioconfig)*4)/10) ;//40 %
+	/*
+	 * set the fragment settings to what the user requested
+	 */
+
+	_fragmentSize = requestedFragmentSize;
+	_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 AudioIOSGI::close()
+{
+	alFreeConfig(audioconfig);
+	alClosePort(audio_port);
+	audio_port=0;
+	if (param(direction) == 3) {
+		alClosePort(audio_port1);
+		audio_port1=0;
+	}
+}
+
+void AudioIOSGI::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 AudioIOSGI::getParam(AudioParam p)
+{
+	int frames;
+	switch(p)
+	{
+		case canRead:
+				frames=alGetFilled(audio_port);
+				return frames*framesz;
+			break;
+
+		case canWrite:
+				frames=alGetFillable(audio_port);
+				return frames*framesz;
+			break;
+
+		case selectReadFD:
+				return (param(direction) & directionRead)?
+						alGetFD(audio_port1):-1;
+			break;
+
+		case selectWriteFD:
+				return (param(direction) & directionWrite)?
+						alGetFD(audio_port):-1;
+			break;
+
+		default:
+				return param(p);
+			break;
+	}
+}
+
+int AudioIOSGI::read(void *buffer, int size)
+{
+	arts_assert(audio_port1 != 0);
+	::alReadFrames(audio_port1,buffer,size/framesz);
+	return size;
+}
+
+int AudioIOSGI::write(void *buffer, int size)
+{
+	arts_assert(audio_port != 0);
+	::alWriteFrames(audio_port,buffer,size/framesz);
+	return size;
+}
+
+#endif