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Add proper loop handling in injector

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This commit is contained in:
Ryan Huffman 2016-01-27 10:14:05 -08:00
parent b56668892e
commit a3b2dd2295
2 changed files with 32 additions and 29 deletions
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52
libraries/audio/src/AudioInjector.cpp
View file

@ -238,16 +238,19 @@ int64_t AudioInjector::injectNextFrame() {
}
}
int bytesToCopy = std::min((_options.stereo ? 2 : 1) * AudioConstants::NETWORK_FRAME_BYTES_PER_CHANNEL,
_audioData.size() - _currentSendOffset);
int totalBytesLeftToCopy = (_options.stereo ? 2 : 1) * AudioConstants::NETWORK_FRAME_BYTES_PER_CHANNEL;
if (!_options.loop) {
// If we aren't looping, let's make sure we don't read past the end
totalBytesLeftToCopy = std::min(totalBytesLeftToCopy, _audioData.size() - _currentSendOffset);
}
// Measure the loudness of this frame
_loudness = 0.0f;
for (int i = 0; i < bytesToCopy; i += sizeof(int16_t)) {
_loudness += abs(*reinterpret_cast<int16_t*>(_audioData.data() + _currentSendOffset + i)) /
for (int i = 0; i < totalBytesLeftToCopy; i += sizeof(int16_t)) {
_loudness += abs(*reinterpret_cast<int16_t*>(_audioData.data() + ((_currentSendOffset + i) % _audioData.size()))) /
(AudioConstants::MAX_SAMPLE_VALUE / 2.0f);
}
_loudness /= (float)(bytesToCopy / sizeof(int16_t));
_loudness /= (float)(totalBytesLeftToCopy/ sizeof(int16_t));
_currentPacket->seek(0);
@ -264,8 +267,16 @@ int64_t AudioInjector::injectNextFrame() {
_currentPacket->seek(audioDataOffset);
// copy the next NETWORK_BUFFER_LENGTH_BYTES_PER_CHANNEL bytes to the packet
_currentPacket->write(_audioData.data() + _currentSendOffset, bytesToCopy);
while (totalBytesLeftToCopy > 0) {
int bytesToCopy = std::min(totalBytesLeftToCopy, _audioData.size() - _currentSendOffset);
_currentPacket->write(_audioData.data() + _currentSendOffset, bytesToCopy);
_currentSendOffset += bytesToCopy;
totalBytesLeftToCopy -= bytesToCopy;
if (_currentSendOffset >= _audioData.size()) {
_currentSendOffset = 0;
}
}
// set the correct size used for this packet
_currentPacket->setPayloadSize(_currentPacket->pos());
@ -280,21 +291,13 @@ int64_t AudioInjector::injectNextFrame() {
_outgoingSequenceNumber++;
}
_currentSendOffset += bytesToCopy;
if (_currentSendOffset >= _audioData.size()) {
// we're at the end of the audio data to send
if (_options.loop) {
// we were asked to loop, set our send offset to 0
_currentSendOffset = 0;
} else {
// we weren't to loop, say that we're done now
finish();
return NEXT_FRAME_DELTA_ERROR_OR_FINISHED;
}
if (_currentSendOffset >= _audioData.size() && !_options.loop) {
finish();
return NEXT_FRAME_DELTA_ERROR_OR_FINISHED;
}
if (_currentSendOffset == bytesToCopy) {
if (!_hasSentFirstFrame) {
_hasSentFirstFrame = true;
// ask AudioInjectorManager to call us right away again to
// immediately send the first two frames so the mixer can start using the audio right away
return NEXT_FRAME_DELTA_IMMEDIATELY;
@ -303,15 +306,14 @@ 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
_nextFrame = currentFrameBasedOnElapsedTime - MAX_ALLOWED_FRAMES_TO_FALL_BEHIND;
} else {
++_nextFrame;
qDebug() << "AudioInjector::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;
int64_t playNextFrameAt = ++_nextFrame * AudioConstants::NETWORK_FRAME_USECS;
return std::max(INT64_C(0), playNextFrameAt - currentTime);
}

9
libraries/audio/src/AudioInjector.h
View file

@ -90,10 +90,11 @@ private:
QByteArray _audioData;
AudioInjectorOptions _options;
State _state { State::NotFinished };
bool _hasSetup = false;
bool _shouldStop = false;
float _loudness = 0.0f;
int _currentSendOffset = 0;
bool _hasSentFirstFrame { false };
bool _hasSetup { false };
bool _shouldStop { false };
float _loudness { 0.0f };
int _currentSendOffset { 0 };
std::unique_ptr<NLPacket> _currentPacket { nullptr };
AbstractAudioInterface* _localAudioInterface { nullptr };
AudioInjectorLocalBuffer* _localBuffer { nullptr };