1 files changed, 142 insertions, 0 deletions
diff --git a/examples/testasubsys.cc b/examples/testasubsys.cc
new file mode 100644
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+++ b/examples/testasubsys.cc
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+    /*
+
+    Copyright (C) 2000 Stefan Westerfeld
+                       stefan@space.twc.de
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+    Permission is also granted to link this program with the Qt
+    library, treating Qt like a library that normally accompanies the
+    operating system kernel, whether or not that is in fact the case.
+
+    */
+
+#include <iostream>
+#include <math.h>
+#include "audiosubsys.h"
+#include "convert.h"
+#include "dispatcher.h"
+
+using namespace std;
+using namespace Arts;
+
+class SinTest : public ASProducer {
+protected:
+	int audiofd;
+	int done;
+	AudioSubSystem *as;
+	bool attached;
+
+public:
+	SinTest();
+	virtual ~SinTest();
+	void needMore();
+	void run(long samples);
+};
+
+SinTest::SinTest() : done(0), as(AudioSubSystem::the())
+{
+	// initialize and open audio subsystem (defaults to 44kHz, 16bit, stereo)
+	attached = as->attachProducer(this);
+	if(!attached)
+	{
+		cout << "audio subsystem is already used?" << endl;
+	}
+	else
+	{
+		if(as->open() == false)
+		{
+			cout << "audio subsystem init failed ("
+			     << as->error() << ")" << endl;
+			audiofd = -1;
+		}
+		else
+			audiofd = as->selectWriteFD();
+	}
+}
+
+SinTest::~SinTest()
+{
+	// deinitialize the audio subsystem
+	if(attached)
+		as->detachProducer();
+}
+
+void SinTest::run(long samples)
+{
+	// run this loop until enough samples are produced
+	while(attached && audiofd >= 0 && (done < samples))
+	{
+		fd_set wfds, efds;
+		FD_ZERO(&wfds);
+		FD_ZERO(&efds);
+		FD_SET(audiofd, &wfds);
+		FD_SET(audiofd, &efds);
+
+		// look if the audio filedescriptor becomes writeable
+		int result = select(audiofd+1,0,&wfds,&efds,0);
+		if(result > 0)
+		{
+			// if yes, tell the audio subsystem to do something about it
+			if(FD_ISSET(audiofd, &wfds))
+				as->handleIO(AudioSubSystem::ioWrite);
+			if(FD_ISSET(audiofd, &efds))
+				as->handleIO(AudioSubSystem::ioExcept);
+		}
+		else
+		{
+			cout << "select returned " << result << endl;
+		}
+	}
+}
+
+/*
+ * needMore is a callback by the audio subsystem, which is made as soon as
+ * the internal buffers need a refill
+ */
+void SinTest::needMore()
+{
+	float left[100], right[100];
+	unsigned char out[400];
+
+	// generate two waves, one 440 Hz (left), one 880Hz (right)
+	for(int i=0;i<100;i++)
+	{
+		left[i] = sin((float)i*6.28/100.0);
+		right[i] = sin((float)i*6.28/50.0);
+	}
+	convert_stereo_2float_i16le(100, left, right, out);
+
+	// write them to the audio subsystem
+	as->write(out,400);
+	done += 100;
+}
+
+/*
+ * This is intended to help testing the audio subsystem with different
+ * hardware without needing to use the whole server.
+ *
+ * Warning: this is *not* an example how to use aRts (there are others),
+ * but a simple test program for debugging purposes.
+ */
+int main()
+{
+	Dispatcher d;	// to get startup classes executed
+
+	// the test, generate 88100 samples (2 seconds) of pure sine wave test data
+	SinTest s;
+	s.run(88100);
+	return 0;
+}