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channelCount math cleanup

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This commit is contained in:
Ken Cooke 2016-11-15 09:10:05 -08:00
parent cc6d68ffdf
commit 30c189e624
1 changed files with 14 additions and 23 deletions

37
libraries/audio-client/src/AudioClient.cpp
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@ -237,14 +237,6 @@ QAudioDeviceInfo getNamedAudioDeviceForMode(QAudio::Mode mode, const QString& de
return result;
}
int numDestinationSamplesRequired(const QAudioFormat& sourceFormat, const QAudioFormat& destinationFormat,
int numSourceSamples) {
float ratio = (float) destinationFormat.channelCount() / sourceFormat.channelCount();
ratio *= (float) destinationFormat.sampleRate() / sourceFormat.sampleRate();
return (numSourceSamples * ratio) + 0.5f;
}
#ifdef Q_OS_WIN
QString friendlyNameForAudioDevice(IMMDevice* pEndpoint) {
QString deviceName;
@ -427,15 +419,15 @@ bool adjustedFormatForAudioDevice(const QAudioDeviceInfo& audioDevice,
}
bool sampleChannelConversion(const int16_t* sourceSamples, int16_t* destinationSamples, unsigned int numSourceSamples,
const QAudioFormat& sourceAudioFormat, const QAudioFormat& destinationAudioFormat) {
if (sourceAudioFormat.channelCount() == 2 && destinationAudioFormat.channelCount() == 1) {
const int sourceChannelCount, const int destinationChannelCount) {
if (sourceChannelCount == 2 && destinationChannelCount == 1) {
// loop through the stereo input audio samples and average every two samples
for (uint i = 0; i < numSourceSamples; i += 2) {
destinationSamples[i / 2] = (sourceSamples[i] / 2) + (sourceSamples[i + 1] / 2);
}
return true;
} else if (sourceAudioFormat.channelCount() == 1 && destinationAudioFormat.channelCount() == 2) {
} else if (sourceChannelCount == 1 && destinationChannelCount == 2) {
// loop through the mono input audio and repeat each sample twice
for (uint i = 0; i < numSourceSamples; ++i) {
@ -451,26 +443,24 @@ bool sampleChannelConversion(const int16_t* sourceSamples, int16_t* destinationS
void possibleResampling(AudioSRC* resampler,
const int16_t* sourceSamples, int16_t* destinationSamples,
unsigned int numSourceSamples, unsigned int numDestinationSamples,
const QAudioFormat& sourceAudioFormat, const QAudioFormat& destinationAudioFormat) {
const int sourceChannelCount, const int destinationChannelCount) {
if (numSourceSamples > 0) {
if (!resampler) {
if (!sampleChannelConversion(sourceSamples, destinationSamples, numSourceSamples,
sourceAudioFormat, destinationAudioFormat)) {
sourceChannelCount, destinationChannelCount)) {
// no conversion, we can copy the samples directly across
memcpy(destinationSamples, sourceSamples, numSourceSamples * AudioConstants::SAMPLE_SIZE);
}
} else {
if (sourceAudioFormat.channelCount() != destinationAudioFormat.channelCount()) {
float channelCountRatio = (float)destinationAudioFormat.channelCount() / sourceAudioFormat.channelCount();
if (sourceChannelCount != destinationChannelCount) {
int numChannelCoversionSamples = (int)(numSourceSamples * channelCountRatio);
int numChannelCoversionSamples = (numSourceSamples * destinationChannelCount) / sourceChannelCount;
int16_t* channelConversionSamples = new int16_t[numChannelCoversionSamples];
sampleChannelConversion(sourceSamples, channelConversionSamples,
numSourceSamples,
sourceAudioFormat, destinationAudioFormat);
sampleChannelConversion(sourceSamples, channelConversionSamples, numSourceSamples,
sourceChannelCount, destinationChannelCount);
resampler->render(channelConversionSamples, destinationSamples, numChannelCoversionSamples);
@ -480,7 +470,7 @@ void possibleResampling(AudioSRC* resampler,
unsigned int numAdjustedSourceSamples = numSourceSamples;
unsigned int numAdjustedDestinationSamples = numDestinationSamples;
if (sourceAudioFormat.channelCount() == 2 && destinationAudioFormat.channelCount() == 2) {
if (sourceChannelCount == 2 && destinationChannelCount == 2) {
numAdjustedSourceSamples /= 2;
numAdjustedDestinationSamples /= 2;
}
@ -857,7 +847,8 @@ void AudioClient::handleLocalEchoAndReverb(QByteArray& inputByteArray) {
static QByteArray loopBackByteArray;
int numInputSamples = inputByteArray.size() / AudioConstants::SAMPLE_SIZE;
int numLoopbackSamples = numDestinationSamplesRequired(_inputFormat, _outputFormat, numInputSamples);
//int numLoopbackSamples = ((int64_t)numInputSamples * _outputFormat.channelCount() * _outputFormat.sampleRate()) / (_inputFormat.channelCount() * _inputFormat.sampleRate());
int numLoopbackSamples = (numInputSamples * _outputFormat.channelCount()) / _inputFormat.channelCount();
loopBackByteArray.resize(numLoopbackSamples * AudioConstants::SAMPLE_SIZE);
@ -865,7 +856,7 @@ void AudioClient::handleLocalEchoAndReverb(QByteArray& inputByteArray) {
int16_t* loopbackSamples = reinterpret_cast<int16_t*>(loopBackByteArray.data());
// upmix mono to stereo
if (!sampleChannelConversion(inputSamples, loopbackSamples, numInputSamples, _inputFormat, _outputFormat)) {
if (!sampleChannelConversion(inputSamples, loopbackSamples, numInputSamples, _inputFormat.channelCount(), _outputFormat.channelCount())) {
// no conversion, just copy the samples
memcpy(loopbackSamples, inputSamples, numInputSamples * AudioConstants::SAMPLE_SIZE);
}
@ -923,7 +914,7 @@ void AudioClient::handleAudioInput() {
possibleResampling(_inputToNetworkResampler,
inputAudioSamples.get(), networkAudioSamples,
inputSamplesRequired, numNetworkSamples,
_inputFormat, _desiredInputFormat);
_inputFormat.channelCount(), _desiredInputFormat.channelCount());
// Remove DC offset
if (!_isStereoInput) {