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- /*
- ==============================================================================
-
- This file is part of the JUCE library.
- Copyright (c) 2013 - Raw Material Software 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.
-
- ==============================================================================
- */
-
- AudioSourcePlayer::AudioSourcePlayer()
- : source (nullptr),
- sampleRate (0),
- bufferSize (0),
- lastGain (1.0f),
- gain (1.0f)
- {
- }
-
- AudioSourcePlayer::~AudioSourcePlayer()
- {
- setSource (nullptr);
- }
-
- void AudioSourcePlayer::setSource (AudioSource* newSource)
- {
- if (source != newSource)
- {
- AudioSource* const oldSource = source;
-
- if (newSource != nullptr && bufferSize > 0 && sampleRate > 0)
- newSource->prepareToPlay (bufferSize, sampleRate);
-
- {
- const ScopedLock sl (readLock);
- source = newSource;
- }
-
- if (oldSource != nullptr)
- oldSource->releaseResources();
- }
- }
-
- void AudioSourcePlayer::setGain (const float newGain) noexcept
- {
- gain = newGain;
- }
-
- void AudioSourcePlayer::audioDeviceIOCallback (const float** inputChannelData,
- int totalNumInputChannels,
- float** outputChannelData,
- int totalNumOutputChannels,
- int numSamples)
- {
- // these should have been prepared by audioDeviceAboutToStart()...
- jassert (sampleRate > 0 && bufferSize > 0);
-
- const ScopedLock sl (readLock);
-
- if (source != nullptr)
- {
- int numActiveChans = 0, numInputs = 0, numOutputs = 0;
-
- // messy stuff needed to compact the channels down into an array
- // of non-zero pointers..
- for (int i = 0; i < totalNumInputChannels; ++i)
- {
- if (inputChannelData[i] != nullptr)
- {
- inputChans [numInputs++] = inputChannelData[i];
- if (numInputs >= numElementsInArray (inputChans))
- break;
- }
- }
-
- for (int i = 0; i < totalNumOutputChannels; ++i)
- {
- if (outputChannelData[i] != nullptr)
- {
- outputChans [numOutputs++] = outputChannelData[i];
- if (numOutputs >= numElementsInArray (outputChans))
- break;
- }
- }
-
- if (numInputs > numOutputs)
- {
- // if there aren't enough output channels for the number of
- // inputs, we need to create some temporary extra ones (can't
- // use the input data in case it gets written to)
- tempBuffer.setSize (numInputs - numOutputs, numSamples,
- false, false, true);
-
- for (int i = 0; i < numOutputs; ++i)
- {
- channels[numActiveChans] = outputChans[i];
- memcpy (channels[numActiveChans], inputChans[i], sizeof (float) * (size_t) numSamples);
- ++numActiveChans;
- }
-
- for (int i = numOutputs; i < numInputs; ++i)
- {
- channels[numActiveChans] = tempBuffer.getWritePointer (i - numOutputs);
- memcpy (channels[numActiveChans], inputChans[i], sizeof (float) * (size_t) numSamples);
- ++numActiveChans;
- }
- }
- else
- {
- for (int i = 0; i < numInputs; ++i)
- {
- channels[numActiveChans] = outputChans[i];
- memcpy (channels[numActiveChans], inputChans[i], sizeof (float) * (size_t) numSamples);
- ++numActiveChans;
- }
-
- for (int i = numInputs; i < numOutputs; ++i)
- {
- channels[numActiveChans] = outputChans[i];
- zeromem (channels[numActiveChans], sizeof (float) * (size_t) numSamples);
- ++numActiveChans;
- }
- }
-
- AudioSampleBuffer buffer (channels, numActiveChans, numSamples);
-
- AudioSourceChannelInfo info (&buffer, 0, numSamples);
- source->getNextAudioBlock (info);
-
- for (int i = info.buffer->getNumChannels(); --i >= 0;)
- buffer.applyGainRamp (i, info.startSample, info.numSamples, lastGain, gain);
-
- lastGain = gain;
- }
- else
- {
- for (int i = 0; i < totalNumOutputChannels; ++i)
- if (outputChannelData[i] != nullptr)
- zeromem (outputChannelData[i], sizeof (float) * (size_t) numSamples);
- }
- }
-
- void AudioSourcePlayer::audioDeviceAboutToStart (AudioIODevice* device)
- {
- prepareToPlay (device->getCurrentSampleRate(),
- device->getCurrentBufferSizeSamples());
- }
-
- void AudioSourcePlayer::prepareToPlay (double newSampleRate, int newBufferSize)
- {
- sampleRate = newSampleRate;
- bufferSize = newBufferSize;
- zeromem (channels, sizeof (channels));
-
- if (source != nullptr)
- source->prepareToPlay (bufferSize, sampleRate);
- }
-
- void AudioSourcePlayer::audioDeviceStopped()
- {
- if (source != nullptr)
- source->releaseResources();
-
- sampleRate = 0.0;
- bufferSize = 0;
-
- tempBuffer.setSize (2, 8);
- }
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