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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
// written by Christian Daniel //
// //
// 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 as version 3 of the License, or //
// //
// 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 V3 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 <string.h>
#include <QAudioFormat>
#include <QAudioDeviceInfo>
#include <QAudioOutput>
#include "audio/audiooutput.h"
#include "audio/audiofifo.h"
AudioOutput::AudioOutput() :
m_mutex(),
m_audioOutput(NULL),
m_audioFifos()
{
}
AudioOutput::~AudioOutput()
{
stop();
QMutexLocker mutexLocker(&m_mutex);
for(AudioFifos::iterator it = m_audioFifos.begin(); it != m_audioFifos.end(); ++it)
delete *it;
m_audioFifos.clear();
}
bool AudioOutput::start(int device, int rate)
{
QMutexLocker mutexLocker(&m_mutex);
Q_UNUSED(device);
Q_UNUSED(rate);
QAudioFormat format;
QAudioDeviceInfo devInfo(QAudioDeviceInfo::defaultOutputDevice());
format.setSampleRate(41000);
format.setChannelCount(2);
format.setSampleSize(16);
format.setCodec("audio/pcm");
format.setByteOrder(QAudioFormat::LittleEndian);
format.setSampleType(QAudioFormat::SignedInt);
if(!devInfo.isFormatSupported(format)) {
qDebug("default format not supported - try to use nearest");
format = devInfo.nearestFormat(format);
}
if(format.sampleSize() != 16) {
qDebug("audio device doesn't support 16 bit samples (%s)", qPrintable(devInfo.defaultOutputDevice().deviceName()));
return false;
}
m_audioOutput = new QAudioOutput(format);
QIODevice::open(QIODevice::ReadOnly);
m_audioOutput->start(this);
return true;
}
void AudioOutput::stop()
{
QMutexLocker mutexLocker(&m_mutex);
if(m_audioOutput != NULL) {
m_audioOutput->stop();
delete m_audioOutput;
m_audioOutput = NULL;
}
QIODevice::close();
}
void AudioOutput::addFifo(AudioFifo* audioFifo)
{
QMutexLocker mutexLocker(&m_mutex);
m_audioFifos.push_back(audioFifo);
}
void AudioOutput::removeFifo(AudioFifo* audioFifo)
{
QMutexLocker mutexLocker(&m_mutex);
m_audioFifos.remove(audioFifo);
}
bool AudioOutput::open(OpenMode mode)
{
Q_UNUSED(mode);
return false;
}
qint64 AudioOutput::readData(char* data, qint64 maxLen)
{
if(maxLen == 0)
return 0;
QMutexLocker mutexLocker(&m_mutex);
maxLen -= maxLen % 4;
int framesPerBuffer = maxLen / 4;
if((int)m_mixBuffer.size() < framesPerBuffer * 2) {
m_mixBuffer.resize(framesPerBuffer * 2); // allocate 2 qint32 per frame (stereo)
if(m_mixBuffer.size() != framesPerBuffer * 2)
return 0;
}
memset(&m_mixBuffer[0], 0x00, 2 * framesPerBuffer * sizeof(m_mixBuffer[0])); // start with silence
// sum up a block from all fifos
for(AudioFifos::iterator it = m_audioFifos.begin(); it != m_audioFifos.end(); ++it) {
// use outputBuffer as temp - yes, one memcpy could be saved
uint samples = (*it)->read((quint8*)data, framesPerBuffer, 1);
const qint16* src = (const qint16*)data;
std::vector<qint32>::iterator dst = m_mixBuffer.begin();
for(uint i = 0; i < samples; i++) {
*dst += *src;
++src;
++dst;
*dst += *src;
++src;
++dst;
}
}
// convert to int16
std::vector<qint32>::const_iterator src = m_mixBuffer.begin();
qint16* dst = (qint16*)data;
for(int i = 0; i < framesPerBuffer; ++i) {
// left channel
qint32 s = *src++;
if(s < -32768)
s = -32768;
else if(s > 32767)
s = 32767;
*dst++ = s;
// right channel
s = *src++;
if(s < -32768)
s = -32768;
else if(s > 32767)
s = 32767;
*dst++ = s;
}
return framesPerBuffer * 4;
}
qint64 AudioOutput::writeData(const char* data, qint64 len)
{
Q_UNUSED(data);
Q_UNUSED(len);
return 0;
}
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