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main.cpp
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main.cpp
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/******************************************************************************
audiopipeline: this file is part of QtAV examples
Copyright (C) 2015-2016 Wang Bin <wbsecg1@gmail.com>
* This file is part of QtAV
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 3 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, see <http://www.gnu.org/licenses/>.
******************************************************************************/
#include <QtAV>
#include <QtCore/QCoreApplication>
#include <QtCore/QScopedPointer>
#include <QtDebug>
using namespace QtAV;
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
qDebug() << QLatin1String("usage: ") << a.applicationFilePath().split(QLatin1String("/")).last().append(QLatin1String(" url"));
if (a.arguments().size() < 2)
return 0;
QScopedPointer<AudioOutput> ao(new AudioOutput());
AVDemuxer demuxer;
demuxer.setMedia(a.arguments().last());
if (!demuxer.load()) {
qWarning() << "Failed to load file " << demuxer.fileName();
return 1;
}
QScopedPointer<AudioDecoder> dec(AudioDecoder::create()); // delete by user
dec->setCodecContext(demuxer.audioCodecContext());
//dec->prepare();
if (!dec->open())
qFatal("open decoder error");
int astream = demuxer.audioStream();
Packet pkt;
while (!demuxer.atEnd()) {
if (!pkt.isValid()) { // continue to decode previous undecoded data
if (!demuxer.readFrame() || demuxer.stream() != astream)
continue;
pkt = demuxer.packet();
}
if (!dec->decode(pkt)) {
pkt = Packet(); // set invalid to read from demuxer
continue;
}
// decode the rest data in the next loop. read from demuxer if no data remains
pkt.data = QByteArray::fromRawData(pkt.data.constData() + pkt.data.size() - dec->undecodedSize(), dec->undecodedSize());
AudioFrame frame(dec->frame()); // why is faster to call frame() for hwdec? no frame() is very slow for VDA
if (!frame)
continue;
//frame.setAudioResampler(dec->resampler()); // if not set, always create a resampler in AudioFrame.to()
AudioFormat af(frame.format());
if (ao->isOpen()) {
af = ao->audioFormat();
} else {
ao->setAudioFormat(af);
dec->resampler()->setOutAudioFormat(ao->audioFormat());
// if decoded format is not supported by audio renderer, change decoder output format
if (af != ao->audioFormat())
dec->resampler()->prepare();
// now af is supported by audio renderer. it's safe to open
if (!ao->open())
qFatal("Open audio output error");
#if 0 // always resample ONCE due to QtAV bug
// the first format unsupported frame still need to be converted to a supported format
if (!ao->isSupported(frame.format()))
frame = frame.to(af);
#endif
qDebug() << "Input: " << frame.format();
qDebug() << "Output: " << af;
}
printf("playing: %.3f...\r", frame.timestamp());
fflush(0);
// always resample ONCE. otherwise data are all 0x0. QtAV bug
frame = frame.to(af);
QByteArray data(frame.data()); // plane data. currently only packet sample formats are supported.
while (!data.isEmpty()) {
ao->play(QByteArray::fromRawData(data.constData(), qMin(data.size(), ao->bufferSize())));
data.remove(0, qMin(data.size(), ao->bufferSize()));
}
}
// dec, ao will be closed in dtor. demuxer will call unload in dtor
return 0;
}