sdrangel/sdrbase/audio/audiooutput.cpp

253 wiersze
6.5 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// 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(0),
m_audioUsageCount(0),
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);
if (m_audioUsageCount == 0)
{
QAudioDeviceInfo devInfo;
if (device < 0)
{
devInfo = QAudioDeviceInfo::defaultOutputDevice();
qWarning("AudioOutput::start: using default device %s", qPrintable(devInfo.defaultOutputDevice().deviceName()));
}
else
{
QList<QAudioDeviceInfo> devicesInfo = QAudioDeviceInfo::availableDevices(QAudio::AudioOutput);
if (device < devicesInfo.size())
{
devInfo = devicesInfo[device];
qWarning("AudioOutput::start: using audio device #%d: %s", device, qPrintable(devInfo.defaultOutputDevice().deviceName()));
}
else
{
devInfo = QAudioDeviceInfo::defaultOutputDevice();
qWarning("AudioOutput::start: audio device #%d does not exist. Using default device %s", device, qPrintable(devInfo.defaultOutputDevice().deviceName()));
}
}
//QAudioDeviceInfo devInfo(QAudioDeviceInfo::defaultOutputDevice());
m_audioFormat.setSampleRate(rate);
m_audioFormat.setChannelCount(2);
m_audioFormat.setSampleSize(16);
m_audioFormat.setCodec("audio/pcm");
m_audioFormat.setByteOrder(QAudioFormat::LittleEndian);
m_audioFormat.setSampleType(QAudioFormat::SignedInt);
if (!devInfo.isFormatSupported(m_audioFormat))
{
m_audioFormat = devInfo.nearestFormat(m_audioFormat);
qWarning("AudioOutput::start: %d Hz S16_LE audio format not supported. New rate: %d", rate, m_audioFormat.sampleRate());
}
if (m_audioFormat.sampleSize() != 16)
{
qWarning("AudioOutput::start: Audio device ( %s ) failed", qPrintable(devInfo.defaultOutputDevice().deviceName()));
return false;
}
m_audioOutput = new QAudioOutput(devInfo, m_audioFormat);
QIODevice::open(QIODevice::ReadOnly);
m_audioOutput->start(this);
if (m_audioOutput->state() != QAudio::ActiveState)
{
qWarning("AudioOutput::start: cannot start");
}
}
m_audioUsageCount++;
return true;
}
void AudioOutput::stop()
{
QMutexLocker mutexLocker(&m_mutex);
if (m_audioUsageCount > 0)
{
m_audioUsageCount--;
if (m_audioUsageCount == 0)
{
QIODevice::close();
// delete m_audioOutput;
}
}
}
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)
{
//qDebug("AudioOutput::readData: %lld", maxLen);
// @TODO: Study this mutex on OSX, for now deadlocks possible
#ifndef __APPLE__
QMutexLocker mutexLocker(&m_mutex);
#endif
unsigned int framesPerBuffer = maxLen / 4;
if (framesPerBuffer == 0)
{
return 0;
}
if (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();
// if (samples != framesPerBuffer)
// {
// qDebug("AudioOutput::readData: read %d samples vs %d requested", samples, framesPerBuffer);
// }
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(); // Valgrind optim
qint16* dst = (qint16*) data;
qint32 s;
for (uint i = 0; i < framesPerBuffer; i++)
{
// left channel
//s = *src++; // Valgrind optim
s = m_mixBuffer[2*i];
if(s < -32768)
{
s = -32768;
}
else if (s > 32767)
{
s = 32767;
}
*dst++ = s;
// right channel
//s = *src++; // Valgrind optim
s = m_mixBuffer[2*i + 1];
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;
}