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tweaks to audioring buffer

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This commit is contained in:
ZappoMan 2014-04-04 07:04:48 -07:00
parent 4c0f83913b
commit b56e0ff3d4
1 changed files with 15 additions and 2 deletions
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17
libraries/audio/src/AudioRingBuffer.cpp
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@ -24,6 +24,7 @@ AudioRingBuffer::AudioRingBuffer(int numFrameSamples) :
{
if (numFrameSamples) {
_buffer = new int16_t[_sampleCapacity];
memset(_buffer, 0, _sampleCapacity * sizeof(int16_t));
_nextOutput = _buffer;
_endOfLastWrite = _buffer;
} else {
@ -47,6 +48,7 @@ void AudioRingBuffer::resizeForFrameSize(qint64 numFrameSamples) {
delete[] _buffer;
_sampleCapacity = numFrameSamples * RING_BUFFER_LENGTH_FRAMES;
_buffer = new int16_t[_sampleCapacity];
memset(_buffer, 0, _sampleCapacity * sizeof(int16_t));
_nextOutput = _buffer;
_endOfLastWrite = _buffer;
}
@ -63,7 +65,8 @@ qint64 AudioRingBuffer::readSamples(int16_t* destination, qint64 maxSamples) {
qint64 AudioRingBuffer::readData(char *data, qint64 maxSize) {
// only copy up to the number of samples we have available
int numReadSamples = std::min((unsigned) (maxSize / sizeof(int16_t)), samplesAvailable());
//int numReadSamples = std::min((unsigned) (maxSize / sizeof(int16_t)), samplesAvailable());
int numReadSamples = _endOfLastWrite ? (maxSize / sizeof(int16_t)) : samplesAvailable();
if (_nextOutput + numReadSamples > _buffer + _sampleCapacity) {
// we're going to need to do two reads to get this data, it wraps around the edge
@ -71,12 +74,15 @@ qint64 AudioRingBuffer::readData(char *data, qint64 maxSize) {
// read to the end of the buffer
int numSamplesToEnd = (_buffer + _sampleCapacity) - _nextOutput;
memcpy(data, _nextOutput, numSamplesToEnd * sizeof(int16_t));
memset(_nextOutput, 0, numSamplesToEnd * sizeof(int16_t)); // clear it
// read the rest from the beginning of the buffer
memcpy(data + (numSamplesToEnd * sizeof(int16_t)), _buffer, (numReadSamples - numSamplesToEnd) * sizeof(int16_t));
memset(_buffer, 0, (numReadSamples - numSamplesToEnd) * sizeof(int16_t)); // clear it
} else {
// read the data
memcpy(data, _nextOutput, numReadSamples * sizeof(int16_t));
memset(_nextOutput, 0, numReadSamples * sizeof(int16_t)); // clear it
}
// push the position of _nextOutput by the number of samples read
@ -102,7 +108,7 @@ qint64 AudioRingBuffer::writeData(const char* data, qint64 maxSize) {
&& (less(_endOfLastWrite, _nextOutput)
&& lessEqual(_nextOutput, shiftedPositionAccomodatingWrap(_endOfLastWrite, samplesToCopy)))) {
// this read will cross the next output, so call us starved and reset the buffer
qDebug() << "Filled the ring buffer. Resetting.";
qDebug() << "Filled the ring buffer. Resetting. <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<";
_endOfLastWrite = _buffer;
_nextOutput = _buffer;
_isStarved = true;
@ -142,6 +148,13 @@ unsigned int AudioRingBuffer::samplesAvailable() const {
if (sampleDifference < 0) {
sampleDifference += _sampleCapacity;
}
if (sampleDifference == 0) {
qDebug() << "ran dry!!! _endOfLastWrite=" << _endOfLastWrite
<< "_nextOutput=" << _nextOutput
<< "_buffer + _sampleCapacity=" << (_buffer + _sampleCapacity)
<< " samplesAvailable() == 0!!!!!!!!!!!!!!!!!!!!";
}
return sampleDifference;
}