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Merge pull request #6976 from birarda/injector-dos

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fix for overflow on injector playNextFrameAt
This commit is contained in:
Ryan Huffman 2016-01-28 16:37:12 -08:00
commit c67f39a6c0
4 changed files with 9 additions and 11 deletions
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3
libraries/audio/src/AudioConstants.h
View file

@ -29,7 +29,10 @@ namespace AudioConstants {
const int NETWORK_FRAME_SAMPLES_PER_CHANNEL = NETWORK_FRAME_BYTES_PER_CHANNEL / sizeof(AudioSample);
const float NETWORK_FRAME_MSECS = (AudioConstants::NETWORK_FRAME_SAMPLES_PER_CHANNEL
/ (float)AudioConstants::SAMPLE_RATE) * 1000.0f;
// be careful with overflows when using this constant
const int NETWORK_FRAME_USECS = static_cast<int>(NETWORK_FRAME_MSECS * 1000.0f);
const int MIN_SAMPLE_VALUE = std::numeric_limits<AudioSample>::min();
const int MAX_SAMPLE_VALUE = std::numeric_limits<AudioSample>::max();
}

13
libraries/audio/src/AudioInjector.cpp
View file

@ -295,14 +295,7 @@ int64_t AudioInjector::injectNextFrame() {
if (audioMixer) {
// send off this audio packet
auto bytesWritten = nodeList->sendUnreliablePacket(*_currentPacket, *audioMixer);
if (bytesWritten < 0) {
auto currentTime = _frameTimer->nsecsElapsed() / 1000;
qDebug() << this << "error sending audio injector packet. NF:"
<< _nextFrame << "CT:" << currentTime
<< "CF:" << currentTime / AudioConstants::NETWORK_FRAME_USECS;
}
nodeList->sendUnreliablePacket(*_currentPacket, *audioMixer);
_outgoingSequenceNumber++;
}
@ -321,14 +314,16 @@ int64_t AudioInjector::injectNextFrame() {
const int MAX_ALLOWED_FRAMES_TO_FALL_BEHIND = 7;
int64_t currentTime = _frameTimer->nsecsElapsed() / 1000;
auto currentFrameBasedOnElapsedTime = currentTime / AudioConstants::NETWORK_FRAME_USECS;
if (currentFrameBasedOnElapsedTime - _nextFrame > MAX_ALLOWED_FRAMES_TO_FALL_BEHIND) {
// If we are falling behind by more frames than our threshold, let's skip the frames ahead
qDebug() << "AudioInjector::injectNextFrame() skipping ahead, fell behind by " << (currentFrameBasedOnElapsedTime - _nextFrame) << " frames";
qDebug() << this << "injectNextFrame() skipping ahead, fell behind by " << (currentFrameBasedOnElapsedTime - _nextFrame) << " frames";
_nextFrame = currentFrameBasedOnElapsedTime;
_currentSendOffset = _nextFrame * AudioConstants::NETWORK_FRAME_BYTES_PER_CHANNEL * (_options.stereo ? 2 : 1) % _audioData.size();
}
int64_t playNextFrameAt = ++_nextFrame * AudioConstants::NETWORK_FRAME_USECS;
return std::max(INT64_C(0), playNextFrameAt - currentTime);
}

2
libraries/audio/src/AudioInjector.h
View file

@ -99,7 +99,7 @@ private:
AbstractAudioInterface* _localAudioInterface { nullptr };
AudioInjectorLocalBuffer* _localBuffer { nullptr };
int _nextFrame { 0 };
int64_t _nextFrame { 0 };
std::unique_ptr<QElapsedTimer> _frameTimer { nullptr };
quint16 _outgoingSequenceNumber { 0 };

2
libraries/audio/src/AudioInjectorManager.cpp
View file

@ -87,7 +87,7 @@ void AudioInjectorManager::run() {
if (!injector.isNull()) {
// this is an injector that's ready to go, have it send a frame now
auto nextCallDelta = injector->injectNextFrame();
if (nextCallDelta >= 0 && !injector->isFinished()) {
// re-enqueue the injector with the correct timing
_injectors.emplace(usecTimestampNow() + nextCallDelta, injector);