itsmattkc
f6064b40df
Workers run in different threads and the backends can poll whether the worker is currently busy or not. However the previous iteration has the worker (and an atomic int) provide the busy state which could easily desync with the main thread (since all workers run in different threads). By holding the busy states in the main thread, the main thread will always be able to poll the busy state accurately.
103 lines
2.3 KiB
C++
103 lines
2.3 KiB
C++
#include "audiobackend.h"
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#include "audioworker.h"
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AudioBackend::AudioBackend(QObject *parent) :
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AudioRenderBackend(parent)
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{
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}
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AudioBackend::~AudioBackend()
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{
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Close();
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}
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QIODevice *AudioBackend::GetAudioPullDevice()
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{
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pull_device_.setFileName(CachePathName());
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return &pull_device_;
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}
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void AudioBackend::InvalidateCache(const rational &start_range, const rational &end_range)
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{
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/*
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// Truncate to length if necessary
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int max_length_in_bytes = params().time_to_bytes(viewer_node()->Length());
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if (pcm_data_.size() > max_length_in_bytes) {
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pcm_data_.resize(max_length_in_bytes);
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}
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*/
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AudioRenderBackend::InvalidateCache(start_range, end_range);
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}
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bool AudioBackend::InitInternal()
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{
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// Initiate one thread per CPU core
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for (int i=0;i<threads().size();i++) {
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// Create one processor object for each thread
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AudioWorker* processor = new AudioWorker();
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processor->SetParameters(params());
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processors_.append(processor);
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}
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return true;
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}
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void AudioBackend::CloseInternal()
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{
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}
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bool AudioBackend::CompileInternal()
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{
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// This backend doesn't compile anything yet
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return true;
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}
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void AudioBackend::DecompileInternal()
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{
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// This backend doesn't compile anything yet
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}
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void AudioBackend::ConnectWorkerToThis(RenderWorker *worker)
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{
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connect(worker, SIGNAL(CompletedCache(NodeDependency, NodeValueTable)), this, SLOT(ThreadCompletedCache(NodeDependency, NodeValueTable)));
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}
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void AudioBackend::ThreadCompletedCache(NodeDependency dep, NodeValueTable data)
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{
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SetWorkerBusyState(static_cast<RenderWorker*>(sender()), false);
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QByteArray cached_samples = data.Get(NodeParam::kSamples).toByteArray();
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int offset = params().time_to_bytes(dep.in());
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int length = params().time_to_bytes(dep.range().length());
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int out_point = offset + length;
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QFile f(CachePathName());
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if (f.open(QFile::WriteOnly | QFile::Append)) {
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if (f.size() < out_point) {
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f.resize(out_point);
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}
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f.seek(offset);
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// Replace data with this data
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int copy_length = qMin(length, cached_samples.size());
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f.write(cached_samples.data(), copy_length);
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if (copy_length < length) {
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// Fill in remainder with silence
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QByteArray empty_space(length - copy_length, 0);
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f.write(empty_space);
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}
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f.close();
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}
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CacheNext();
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}
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