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LibAudio: Speed up WavWriter by buffering output data

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We were calling write syscall twice for every sample, which effectively
hurt the writer's performance.

With this change exporting a melody in the Piano app now takes less than
a second, which previously took about 20 seconds on my machine.

Additionally, I've removed an unused `WavWriter::file()` getter.
This commit is contained in:
Karol Kosek 2023-11-23 22:09:13 +01:00 • committed by Tim Flynn
parent fbf87299a2
commit 963a6b3d3d
2 changed files with 3 additions and 3 deletions
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3
Userland/Libraries/LibAudio/WavWriter.cpp
View file

@ -33,7 +33,8 @@ WavWriter::~WavWriter()
ErrorOr<void> WavWriter::set_file(StringView path)
{
m_file = TRY(Core::File::open(path, Core::File::OpenMode::Write));
auto file = TRY(Core::File::open(path, Core::File::OpenMode::Write));
m_file = TRY(Core::OutputBufferedFile::create(move(file)));
TRY(m_file->seek(44, SeekMode::SetPosition));
m_finalized = false;
return {};

3
Userland/Libraries/LibAudio/WavWriter.h
View file

@ -33,7 +33,6 @@ public:
u32 sample_rate() const { return m_sample_rate; }
u16 num_channels() const { return m_num_channels; }
PcmSampleFormat sample_format() const { return m_sample_format; }
Core::File& file() const { return *m_file; }
ErrorOr<void> set_file(StringView path);
void set_num_channels(int num_channels) { m_num_channels = num_channels; }
@ -42,7 +41,7 @@ public:
private:
ErrorOr<void> write_header();
OwnPtr<Core::File> m_file;
OwnPtr<Core::OutputBufferedFile> m_file;
bool m_finalized { false };
u32 m_sample_rate;