343 lines
11 KiB
C++
343 lines
11 KiB
C++
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2020 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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The code included in this file is provided under the terms of the ISC license
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http://www.isc.org/downloads/software-support-policy/isc-license. Permission
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To use, copy, modify, and/or distribute this software for any purpose with or
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without fee is hereby granted provided that the above copyright notice and
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this permission notice appear in all copies.
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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BufferingAudioSource::BufferingAudioSource (PositionableAudioSource* s,
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TimeSliceThread& thread,
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bool deleteSourceWhenDeleted,
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int bufferSizeSamples,
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int numChannels,
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bool prefillBufferOnPrepareToPlay)
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: source (s, deleteSourceWhenDeleted),
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backgroundThread (thread),
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numberOfSamplesToBuffer (jmax (1024, bufferSizeSamples)),
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numberOfChannels (numChannels),
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prefillBuffer (prefillBufferOnPrepareToPlay)
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{
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jassert (source != nullptr);
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jassert (numberOfSamplesToBuffer > 1024); // not much point using this class if you're
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// not using a larger buffer..
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}
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BufferingAudioSource::~BufferingAudioSource()
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{
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releaseResources();
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}
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//==============================================================================
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void BufferingAudioSource::prepareToPlay (int samplesPerBlockExpected, double newSampleRate)
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{
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auto bufferSizeNeeded = jmax (samplesPerBlockExpected * 2, numberOfSamplesToBuffer);
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if (newSampleRate != sampleRate
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|| bufferSizeNeeded != buffer.getNumSamples()
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|| ! isPrepared)
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{
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backgroundThread.removeTimeSliceClient (this);
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isPrepared = true;
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sampleRate = newSampleRate;
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source->prepareToPlay (samplesPerBlockExpected, newSampleRate);
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buffer.setSize (numberOfChannels, bufferSizeNeeded);
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buffer.clear();
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const ScopedLock sl (bufferRangeLock);
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bufferValidStart = 0;
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bufferValidEnd = 0;
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backgroundThread.addTimeSliceClient (this);
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do
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{
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const ScopedUnlock ul (bufferRangeLock);
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backgroundThread.moveToFrontOfQueue (this);
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Thread::sleep (5);
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}
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while (prefillBuffer
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&& (bufferValidEnd - bufferValidStart < jmin (((int) newSampleRate) / 4, buffer.getNumSamples() / 2)));
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}
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}
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void BufferingAudioSource::releaseResources()
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{
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isPrepared = false;
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backgroundThread.removeTimeSliceClient (this);
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buffer.setSize (numberOfChannels, 0);
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// MSVC2015 seems to need this if statement to not generate a warning during linking.
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// As source is set in the constructor, there is no way that source could
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// ever equal this, but it seems to make MSVC2015 happy.
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if (source != this)
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source->releaseResources();
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}
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void BufferingAudioSource::getNextAudioBlock (const AudioSourceChannelInfo& info)
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{
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const auto bufferRange = getValidBufferRange (info.numSamples);
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if (bufferRange.isEmpty())
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{
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// total cache miss
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info.clearActiveBufferRegion();
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return;
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}
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const auto validStart = bufferRange.getStart();
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const auto validEnd = bufferRange.getEnd();
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const ScopedLock sl (callbackLock);
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if (validStart > 0)
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info.buffer->clear (info.startSample, validStart); // partial cache miss at start
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if (validEnd < info.numSamples)
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info.buffer->clear (info.startSample + validEnd,
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info.numSamples - validEnd); // partial cache miss at end
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if (validStart < validEnd)
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{
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for (int chan = jmin (numberOfChannels, info.buffer->getNumChannels()); --chan >= 0;)
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{
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jassert (buffer.getNumSamples() > 0);
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const auto startBufferIndex = (int) ((validStart + nextPlayPos) % buffer.getNumSamples());
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const auto endBufferIndex = (int) ((validEnd + nextPlayPos) % buffer.getNumSamples());
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if (startBufferIndex < endBufferIndex)
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{
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info.buffer->copyFrom (chan, info.startSample + validStart,
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buffer,
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chan, startBufferIndex,
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validEnd - validStart);
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}
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else
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{
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const auto initialSize = buffer.getNumSamples() - startBufferIndex;
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info.buffer->copyFrom (chan, info.startSample + validStart,
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buffer,
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chan, startBufferIndex,
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initialSize);
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info.buffer->copyFrom (chan, info.startSample + validStart + initialSize,
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buffer,
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chan, 0,
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(validEnd - validStart) - initialSize);
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}
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}
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}
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nextPlayPos += info.numSamples;
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}
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bool BufferingAudioSource::waitForNextAudioBlockReady (const AudioSourceChannelInfo& info, uint32 timeout)
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{
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if (source == nullptr || source->getTotalLength() <= 0)
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return false;
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if ((nextPlayPos + info.numSamples < 0)
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|| (! isLooping() && nextPlayPos > getTotalLength()))
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return true;
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const auto startTime = Time::getMillisecondCounter();
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auto now = startTime;
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auto elapsed = (now >= startTime ? now - startTime
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: (std::numeric_limits<uint32>::max() - startTime) + now);
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while (elapsed <= timeout)
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{
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const auto bufferRange = getValidBufferRange (info.numSamples);
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const auto validStart = bufferRange.getStart();
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const auto validEnd = bufferRange.getEnd();
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if (validStart <= 0
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&& validStart < validEnd
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&& validEnd >= info.numSamples)
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{
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return true;
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}
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if (elapsed < timeout
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&& ! bufferReadyEvent.wait (static_cast<int> (timeout - elapsed)))
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{
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return false;
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}
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now = Time::getMillisecondCounter();
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elapsed = (now >= startTime ? now - startTime
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: (std::numeric_limits<uint32>::max() - startTime) + now);
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}
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return false;
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}
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void BufferingAudioSource::setLoopRange (int64 loopStart, int64 loopLength)
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{
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source->setLoopRange(loopStart, loopLength);
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loopRangeChanged = true;
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backgroundThread.moveToFrontOfQueue (this);
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}
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int64 BufferingAudioSource::getNextReadPosition() const
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{
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jassert (source->getTotalLength() > 0);
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const auto pos = nextPlayPos.load();
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if (source->isLooping()) {
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int64 loopstart, looplen;
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source->getLoopRange(loopstart, looplen);
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return ((pos - loopstart) % looplen) + loopstart ;
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}
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else return pos;
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}
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void BufferingAudioSource::setNextReadPosition (int64 newPosition)
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{
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const ScopedLock sl (bufferRangeLock);
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nextPlayPos = newPosition;
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backgroundThread.moveToFrontOfQueue (this);
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}
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Range<int> BufferingAudioSource::getValidBufferRange (int numSamples) const
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{
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const ScopedLock sl (bufferRangeLock);
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const auto pos = nextPlayPos.load();
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return { (int) (jlimit (bufferValidStart, bufferValidEnd, pos) - pos),
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(int) (jlimit (bufferValidStart, bufferValidEnd, pos + numSamples) - pos) };
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}
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bool BufferingAudioSource::readNextBufferChunk()
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{
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int64 newBVS, newBVE, sectionToReadStart, sectionToReadEnd;
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{
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const ScopedLock sl (bufferRangeLock);
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if (wasSourceLooping != isLooping() || loopRangeChanged)
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{
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wasSourceLooping = isLooping();
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bufferValidStart = 0;
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bufferValidEnd = 0;
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loopRangeChanged = false;
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}
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newBVS = jmax ((int64) 0, nextPlayPos.load());
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newBVE = newBVS + buffer.getNumSamples() - 4;
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sectionToReadStart = 0;
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sectionToReadEnd = 0;
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constexpr int maxChunkSize = 2048;
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if (newBVS < bufferValidStart || newBVS >= bufferValidEnd)
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{
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newBVE = jmin (newBVE, newBVS + maxChunkSize);
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sectionToReadStart = newBVS;
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sectionToReadEnd = newBVE;
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bufferValidStart = 0;
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bufferValidEnd = 0;
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}
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else if (std::abs ((int) (newBVS - bufferValidStart)) > 512
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|| std::abs ((int) (newBVE - bufferValidEnd)) > 512)
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{
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newBVE = jmin (newBVE, bufferValidEnd + maxChunkSize);
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sectionToReadStart = bufferValidEnd;
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sectionToReadEnd = newBVE;
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bufferValidStart = newBVS;
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bufferValidEnd = jmin (bufferValidEnd, newBVE);
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}
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}
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if (sectionToReadStart == sectionToReadEnd)
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return false;
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jassert (buffer.getNumSamples() > 0);
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const auto bufferIndexStart = (int) (sectionToReadStart % buffer.getNumSamples());
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const auto bufferIndexEnd = (int) (sectionToReadEnd % buffer.getNumSamples());
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if (bufferIndexStart < bufferIndexEnd)
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{
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readBufferSection (sectionToReadStart,
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(int) (sectionToReadEnd - sectionToReadStart),
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bufferIndexStart);
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}
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else
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{
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const auto initialSize = buffer.getNumSamples() - bufferIndexStart;
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readBufferSection (sectionToReadStart,
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initialSize,
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bufferIndexStart);
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readBufferSection (sectionToReadStart + initialSize,
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(int) (sectionToReadEnd - sectionToReadStart) - initialSize,
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0);
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}
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{
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const ScopedLock sl2 (bufferRangeLock);
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bufferValidStart = newBVS;
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bufferValidEnd = newBVE;
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}
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bufferReadyEvent.signal();
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return true;
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}
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void BufferingAudioSource::readBufferSection (int64 start, int length, int bufferOffset)
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{
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if (source->getNextReadPosition() != start)
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source->setNextReadPosition (start);
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AudioSourceChannelInfo info (&buffer, bufferOffset, length);
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const ScopedLock sl (callbackLock);
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source->getNextAudioBlock (info);
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}
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int BufferingAudioSource::useTimeSlice()
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{
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return readNextBufferChunk() ? 1 : 100;
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}
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} // namespace juce
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