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Merge pull request #4407 from birarda/windows-fixes

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fix for out of bounds sound resampling
This commit is contained in:
Philip Rosedale 2015-03-10 13:35:22 -07:00
commit 4b53cfb950
1 changed files with 22 additions and 11 deletions
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33
libraries/audio/src/Sound.cpp
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@ -94,30 +94,41 @@ void Sound::downloadFinished(QNetworkReply* reply) {
void Sound::downSample(const QByteArray& rawAudioByteArray) {
// assume that this was a RAW file and is now an array of samples that are
// signed, 16-bit, 48Khz, mono
// signed, 16-bit, 48Khz
// we want to convert it to the format that the audio-mixer wants
// which is signed, 16-bit, 24Khz, mono
_byteArray.resize(rawAudioByteArray.size() / 2);
// which is signed, 16-bit, 24Khz
int numSourceSamples = rawAudioByteArray.size() / sizeof(int16_t);
int numDestinationBytes = rawAudioByteArray.size() / 2;
if (_isStereo && numSourceSamples % 4 != 0) {
numDestinationBytes += 1;
}
_byteArray.resize(numDestinationBytes);
int16_t* sourceSamples = (int16_t*) rawAudioByteArray.data();
int16_t* destinationSamples = (int16_t*) _byteArray.data();
if (_isStereo) {
for (int i = 0; i < numSourceSamples; i += 4) {
destinationSamples[i / 2] = (sourceSamples[i] / 2) + (sourceSamples[i + 2] / 2);
destinationSamples[(i / 2) + 1] = (sourceSamples[i + 1] / 2) + (sourceSamples[i + 3] / 2);
if (i + 2 >= numSourceSamples) {
destinationSamples[i / 2] = sourceSamples[i];
destinationSamples[(i / 2) + 1] = sourceSamples[i + 1];
} else {
destinationSamples[i / 2] = (sourceSamples[i] + sourceSamples[i + 2]) / 2;
destinationSamples[(i / 2) + 1] = (sourceSamples[i + 1] + sourceSamples[i + 3]) / 2;
}
}
} else {
for (int i = 1; i < numSourceSamples; i += 2) {
if (i + 1 >= numSourceSamples) {
destinationSamples[(i - 1) / 2] = (sourceSamples[i - 1] / 2) + (sourceSamples[i] / 2);
destinationSamples[(i - 1) / 2] = (sourceSamples[i - 1] + sourceSamples[i]) / 2;
} else {
destinationSamples[(i - 1) / 2] = (sourceSamples[i - 1] / 4) + (sourceSamples[i] / 2)
+ (sourceSamples[i + 1] / 4);
destinationSamples[(i - 1) / 2] = ((sourceSamples[i - 1] + sourceSamples[i + 1]) / 4) + (sourceSamples[i] / 2);
}
}
}