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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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;
+}