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143 lines
3.4 KiB
143 lines
3.4 KiB
/*
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Copyright (C) 2000 Stefan Westerfeld
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stefan@space.twc.de
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Permission is also granted to link this program with the TQt
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library, treating TQt like a library that normally accompanies the
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operating system kernel, whether or not that is in fact the case.
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*/
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#include <iostream>
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#include <math.h>
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#include "audiosubsys.h"
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#include "convert.h"
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#include "dispatcher.h"
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using namespace std;
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using namespace Arts;
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class SinTest : public ASProducer {
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protected:
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int audiofd;
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int done;
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AudioSubSystem *as;
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bool attached;
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public:
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SinTest();
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virtual ~SinTest();
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void needMore();
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void run(long samples);
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};
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SinTest::SinTest() : done(0), as(AudioSubSystem::the())
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{
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// initialize and open audio subsystem (defaults to 44kHz, 16bit, stereo)
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attached = as->attachProducer(this);
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if(!attached)
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{
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cout << "audio subsystem is already used?" << endl;
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}
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else
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{
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if(as->open() == false)
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{
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cout << "audio subsystem init failed ("
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<< as->error() << ")" << endl;
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audiofd = -1;
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}
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else
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audiofd = as->selectWriteFD();
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}
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}
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SinTest::~SinTest()
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{
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// deinitialize the audio subsystem
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if(attached)
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as->detachProducer();
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}
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void SinTest::run(long samples)
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{
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// run this loop until enough samples are produced
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while(attached && audiofd >= 0 && (done < samples))
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{
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fd_set wfds, efds;
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FD_ZERO(&wfds);
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FD_ZERO(&efds);
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FD_SET(audiofd, &wfds);
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FD_SET(audiofd, &efds);
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// look if the audio filedescriptor becomes writeable
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int result = select(audiofd+1,0,&wfds,&efds,0);
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if(result > 0)
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{
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// if yes, tell the audio subsystem to do something about it
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if(FD_ISSET(audiofd, &wfds))
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as->handleIO(AudioSubSystem::ioWrite);
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if(FD_ISSET(audiofd, &efds))
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as->handleIO(AudioSubSystem::ioExcept);
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}
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else
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{
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cout << "select returned " << result << endl;
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}
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}
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}
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/*
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* needMore is a callback by the audio subsystem, which is made as soon as
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* the internal buffers need a refill
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*/
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void SinTest::needMore()
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{
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float left[100], right[100];
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unsigned char out[400];
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// generate two waves, one 440 Hz (left), one 880Hz (right)
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for(int i=0;i<100;i++)
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{
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left[i] = sin((float)i*6.28/100.0);
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right[i] = sin((float)i*6.28/50.0);
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}
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convert_stereo_2float_i16le(100, left, right, out);
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// write them to the audio subsystem
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as->write(out,400);
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done += 100;
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}
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/*
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* This is intended to help testing the audio subsystem with different
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* hardware without needing to use the whole server.
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*
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* Warning: this is *not* an example how to use aRts (there are others),
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* but a simple test program for debugging purposes.
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*/
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int main()
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{
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Dispatcher d; // to get startup classes executed
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// the test, generate 88100 samples (2 seconds) of pure sine wave test data
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SinTest s;
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s.run(88100);
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return 0;
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}
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