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forego memory sample buffer and only write samples that need writing

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Rather than writing the entire sequence audio to disk every change, now we
just write the parts we need to write.
This commit is contained in:
itsmattkc
2019-11-20 10:32:46 +09:00
parent 6693fc75a3
commit 2599c1e8a4
4 changed files with 35 additions and 25 deletions
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app/render/backend/audio/audiobackend.cpp
+32 -17
View File
@@ -19,6 +19,19 @@ QIODevice *AudioBackend::GetAudioPullDevice()
return &pull_device_;
}
void AudioBackend::InvalidateCache(const rational &start_range, const rational &end_range)
{
/*
// Truncate to length if necessary
int max_length_in_bytes = params().time_to_bytes(viewer_node()->Length());
if (pcm_data_.size() > max_length_in_bytes) {
pcm_data_.resize(max_length_in_bytes);
}
*/
AudioRenderBackend::InvalidateCache(start_range, end_range);
}
bool AudioBackend::InitInternal()
{
// Initiate one thread per CPU core
@@ -34,7 +47,6 @@ bool AudioBackend::InitInternal()
void AudioBackend::CloseInternal()
{
// This backend doesn't init anything yet
}
bool AudioBackend::CompileInternal()
@@ -63,23 +75,26 @@ void AudioBackend::ThreadCompletedCache(NodeDependency dep)
int length = params().time_to_bytes(dep.range().length());
int out_point = offset + length;
if (pcm_data_.size() < out_point) {
pcm_data_.resize(out_point);
}
// Replace data with this data
int copy_length = qMin(length, cached_samples.size());
memcpy(pcm_data_.data() + offset, cached_samples.data(), static_cast<size_t>(copy_length));
if (copy_length < length) {
// Fill in remainder with silence
memset(pcm_data_.data() + offset + copy_length, 0, static_cast<size_t>(length - copy_length));
}
QFile f(CachePathName());
if (f.open(QFile::WriteOnly)) {
f.write(pcm_data_);
if (f.open(QFile::WriteOnly | QFile::Append)) {
if (f.size() < out_point) {
f.resize(out_point);
}
f.seek(offset);
// Replace data with this data
int copy_length = qMin(length, cached_samples.size());
f.write(cached_samples.data(), copy_length);
if (copy_length < length) {
// Fill in remainder with silence
QByteArray empty_space(length - copy_length, 0);
f.write(empty_space);
}
f.close();
}