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https://github.com/wang-bin/QtAV.git
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wang-bin
89 lines
3.0 KiB
C++
89 lines
3.0 KiB
C++
/******************************************************************************
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QtAV: Media play library based on Qt and FFmpeg
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Copyright (C) 2014-2015 Wang Bin <wbsecg1@gmail.com>
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* This file is part of QtAV
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; 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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******************************************************************************/
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#include <limits>
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#include <QtCore/qmath.h>
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#include <QtCore/QCoreApplication>
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#include <QtCore/QElapsedTimer>
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#include <QtCore/QStringList>
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#include <QtAV/AudioOutput.h>
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#include <QtDebug>
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using namespace QtAV;
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const int kTableSize = 200;
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const int kFrames = 1024;
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qint16 sin_table[kTableSize];
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void help() {
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qDebug() << QLatin1String("parameters: [-ao ") << AudioOutput::backendsAvailable().join(QLatin1String("|")) << QLatin1String("]");
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}
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int main(int argc, char** argv)
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{
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help();
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/* initialise sinusoidal wavetable */
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for(int i=0; i<kTableSize; i++) {
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sin_table[i] = (qint16)((double)std::numeric_limits<qint16>::max() * sin(((double)i/(double)kTableSize)*3.1415926*2.0));
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}
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QCoreApplication app(argc, argv); //only used qapp to get parameter easily
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AudioOutput ao;
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int idx = app.arguments().indexOf(QLatin1String("-ao"));
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if (idx > 0)
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ao.setBackends(QStringList() << app.arguments().at(idx+1));
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if (ao.backend().isEmpty()) {
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qWarning("unknow backend");
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return -1;
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}
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AudioFormat af;
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af.setChannels(2);
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af.setSampleFormat(AudioFormat::SampleFormat_Signed16);
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af.setSampleRate(44100);
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if (!ao.isSupported(af)) {
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qDebug() << "does not support format: " << af;
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return -1;
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}
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ao.setAudioFormat(af);
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QByteArray data(af.bytesPerFrame()*kFrames, 0); //bytesPerSample*channels*1024
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ao.setBufferSize(data.size());
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if (!ao.open()) {
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qWarning("open audio error");
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return -1;
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}
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int left =0, right = 0;
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QElapsedTimer timer;
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timer.start();
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while (timer.elapsed() < 3000) {
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qint16 *d = (qint16*)data.data();
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for (int k = 0; k < kFrames; k++) {
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*d++ = sin_table[left];
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*d++ = sin_table[right];
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left = (left+1) % kTableSize;
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right = (right+3)% kTableSize;
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}
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ao.setVolume(2*sin(2.0*M_PI/1000.0*timer.elapsed()));
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ao.play(data);
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}
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ao.close();
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return 0;
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}
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