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Merge pull request #11602 from kencooke/audio-startup-fix

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Fix loud screeching sound when certain users join a domain
This commit is contained in:
Brad Hefta-Gaub 2017-10-16 16:47:42 -07:00 committed by GitHub
commit c1ce84b060
2 changed files with 29 additions and 10 deletions
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38
libraries/audio/src/InboundAudioStream.cpp
View file

@ -46,6 +46,10 @@ static const int STATS_FOR_STATS_PACKET_WINDOW_SECONDS = 30;
// _currentJitterBufferFrames is updated with the time-weighted avg and the running time-weighted avg is reset.
static const quint64 FRAMES_AVAILABLE_STAT_WINDOW_USECS = 10 * USECS_PER_SECOND;
// When the audio codec is switched, temporary codec mismatch is expected due to packets in-flight.
// A SelectedAudioFormat packet is not sent until this threshold is exceeded.
static const int MAX_MISMATCHED_AUDIO_CODEC_COUNT = 10;
InboundAudioStream::InboundAudioStream(int numChannels, int numFrames, int numBlocks, int numStaticJitterBlocks) :
_ringBuffer(numChannels * numFrames, numBlocks),
_numChannels(numChannels),
@ -153,6 +157,7 @@ int InboundAudioStream::parseData(ReceivedMessage& message) {
// If we recieved a SilentAudioFrame from our sender, we might want to drop
// some of the samples in order to catch up to our desired jitter buffer size.
writeDroppableSilentFrames(networkFrames);
} else {
// note: PCM and no codec are identical
bool selectedPCM = _selectedCodecName == "pcm" || _selectedCodecName == "";
@ -160,20 +165,33 @@ int InboundAudioStream::parseData(ReceivedMessage& message) {
if (codecInPacket == _selectedCodecName || (packetPCM && selectedPCM)) {
auto afterProperties = message.readWithoutCopy(message.getBytesLeftToRead());
parseAudioData(message.getType(), afterProperties);
_mismatchedAudioCodecCount = 0;
} else {
qDebug(audio) << "Codec mismatch: expected" << _selectedCodecName << "got" << codecInPacket << "writing silence";
_mismatchedAudioCodecCount++;
qDebug(audio) << "Codec mismatch: expected" << _selectedCodecName << "got" << codecInPacket;
// Since the data in the stream is using a codec that we aren't prepared for,
// we need to let the codec know that we don't have data for it, this will
// allow the codec to interpolate missing data and produce a fade to silence.
lostAudioData(1);
// inform others of the mismatch
auto sendingNode = DependencyManager::get<NodeList>()->nodeWithUUID(message.getSourceID());
if (sendingNode) {
emit mismatchedAudioCodec(sendingNode, _selectedCodecName, codecInPacket);
if (packetPCM) {
// If there are PCM packets in-flight after the codec is changed, use them.
auto afterProperties = message.readWithoutCopy(message.getBytesLeftToRead());
_ringBuffer.writeData(afterProperties.data(), afterProperties.size());
} else {
// Since the data in the stream is using a codec that we aren't prepared for,
// we need to let the codec know that we don't have data for it, this will
// allow the codec to interpolate missing data and produce a fade to silence.
lostAudioData(1);
}
if (_mismatchedAudioCodecCount > MAX_MISMATCHED_AUDIO_CODEC_COUNT) {
_mismatchedAudioCodecCount = 0;
// inform others of the mismatch
auto sendingNode = DependencyManager::get<NodeList>()->nodeWithUUID(message.getSourceID());
if (sendingNode) {
emit mismatchedAudioCodec(sendingNode, _selectedCodecName, codecInPacket);
qDebug(audio) << "Codec mismatch threshold exceeded, SelectedAudioFormat(" << _selectedCodecName << " ) sent";
}
}
}
}
break;

1
libraries/audio/src/InboundAudioStream.h
View file

@ -186,6 +186,7 @@ protected:
CodecPluginPointer _codec;
QString _selectedCodecName;
Decoder* _decoder { nullptr };
int _mismatchedAudioCodecCount { 0 };
};
float calculateRepeatedFrameFadeFactor(int indexOfRepeat);