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/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2015 - ROLI Ltd.
Permission is granted to use this software under the terms of either:
a) the GPL v2 (or any later version)
b) the Affero GPL v3
Details of these licenses can be found at: www.gnu.org/licenses
JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
------------------------------------------------------------------------------
To release a closed-source product which uses JUCE, commercial licenses are
available: visit www.juce.com for more information.
==============================================================================
*/
BufferingAudioReader::BufferingAudioReader (AudioFormatReader* sourceReader,
TimeSliceThread& timeSliceThread,
int samplesToBuffer)
: AudioFormatReader (nullptr, sourceReader->getFormatName()),
source (sourceReader), thread (timeSliceThread),
nextReadPosition (0),
numBlocks (1 + (samplesToBuffer / samplesPerBlock)),
timeoutMs (0)
{
sampleRate = source->sampleRate;
lengthInSamples = source->lengthInSamples;
numChannels = source->numChannels;
metadataValues = source->metadataValues;
bitsPerSample = 32;
usesFloatingPointData = true;
for (int i = 3; --i >= 0;)
readNextBufferChunk();
timeSliceThread.addTimeSliceClient (this);
}
BufferingAudioReader::~BufferingAudioReader()
{
thread.removeTimeSliceClient (this);
}
void BufferingAudioReader::setReadTimeout (int timeoutMilliseconds) noexcept
{
timeoutMs = timeoutMilliseconds;
}
bool BufferingAudioReader::readSamples (int** destSamples, int numDestChannels, int startOffsetInDestBuffer,
int64 startSampleInFile, int numSamples)
{
const uint32 startTime = Time::getMillisecondCounter();
clearSamplesBeyondAvailableLength (destSamples, numDestChannels, startOffsetInDestBuffer,
startSampleInFile, numSamples, lengthInSamples);
const ScopedLock sl (lock);
nextReadPosition = startSampleInFile;
while (numSamples > 0)
{
if (const BufferedBlock* const block = getBlockContaining (startSampleInFile))
{
const int offset = (int) (startSampleInFile - block->range.getStart());
const int numToDo = jmin (numSamples, (int) (block->range.getEnd() - startSampleInFile));
for (int j = 0; j < numDestChannels; ++j)
{
if (float* dest = (float*) destSamples[j])
{
dest += startOffsetInDestBuffer;
if (j < (int) numChannels)
FloatVectorOperations::copy (dest, block->buffer.getReadPointer (j, offset), numToDo);
else
FloatVectorOperations::clear (dest, numToDo);
}
}
startOffsetInDestBuffer += numToDo;
startSampleInFile += numToDo;
numSamples -= numToDo;
}
else
{
if (timeoutMs >= 0 && Time::getMillisecondCounter() >= startTime + (uint32) timeoutMs)
{
for (int j = 0; j < numDestChannels; ++j)
if (float* dest = (float*) destSamples[j])
FloatVectorOperations::clear (dest + startOffsetInDestBuffer, numSamples);
break;
}
else
{
ScopedUnlock ul (lock);
Thread::yield();
}
}
}
return true;
}
BufferingAudioReader::BufferedBlock::BufferedBlock (AudioFormatReader& reader, int64 pos, int numSamples)
: range (pos, pos + numSamples),
buffer ((int) reader.numChannels, numSamples)
{
reader.read (&buffer, 0, numSamples, pos, true, true);
}
BufferingAudioReader::BufferedBlock* BufferingAudioReader::getBlockContaining (int64 pos) const noexcept
{
for (int i = blocks.size(); --i >= 0;)
{
BufferedBlock* const b = blocks.getUnchecked(i);
if (b->range.contains (pos))
return b;
}
return nullptr;
}
int BufferingAudioReader::useTimeSlice()
{
return readNextBufferChunk() ? 1 : 100;
}
bool BufferingAudioReader::readNextBufferChunk()
{
const int64 pos = nextReadPosition;
const int64 startPos = ((pos - 1024) / samplesPerBlock) * samplesPerBlock;
const int64 endPos = startPos + numBlocks * samplesPerBlock;
OwnedArray<BufferedBlock> newBlocks;
for (int i = blocks.size(); --i >= 0;)
if (blocks.getUnchecked(i)->range.intersects (Range<int64> (startPos, endPos)))
newBlocks.add (blocks.getUnchecked(i));
if (newBlocks.size() == numBlocks)
{
newBlocks.clear (false);
return false;
}
for (int64 p = startPos; p < endPos; p += samplesPerBlock)
{
if (getBlockContaining (p) == nullptr)
{
newBlocks.add (new BufferedBlock (*source, p, samplesPerBlock));
break; // just do one block
}
}
{
const ScopedLock sl (lock);
newBlocks.swapWith (blocks);
}
for (int i = blocks.size(); --i >= 0;)
newBlocks.removeObject (blocks.getUnchecked(i), false);
return true;
}
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