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https://github.com/RGBCube/serenity
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LibAudio: Add an adjustable buffer size to FlacLoader
This makes it easier to fine-tune the optimal input buffer size.
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parent
eb1f00a940
commit
9fa3aa84e1
2 changed files with 16 additions and 13 deletions
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@ -4,12 +4,12 @@
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "AK/StdLibExtras.h"
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#include <AK/Debug.h>
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#include <AK/FlyString.h>
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#include <AK/Format.h>
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#include <AK/Math.h>
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#include <AK/ScopeGuard.h>
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#include <AK/StdLibExtras.h>
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <AK/Try.h>
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@ -30,19 +30,15 @@ FlacLoaderPlugin::FlacLoaderPlugin(StringView path)
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return;
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}
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auto maybe_stream = Core::InputFileStream::open_buffered(path);
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if (maybe_stream.is_error()) {
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m_error = LoaderError { "Can't open file stream" };
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return;
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}
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m_stream = make<FlacInputStream>(maybe_stream.release_value());
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auto maybe_stream = Buffered<Core::InputFileStream, FLAC_BUFFER_SIZE> { MUST(Core::File::open(path, Core::OpenMode::ReadOnly)) };
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m_stream = make<FlacInputStream<FLAC_BUFFER_SIZE>>(move(maybe_stream));
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if (!m_stream)
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m_error = LoaderError { "Can't open file stream" };
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}
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FlacLoaderPlugin::FlacLoaderPlugin(const ByteBuffer& buffer)
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{
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m_stream = make<FlacInputStream>(InputMemoryStream(buffer));
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m_stream = make<FlacInputStream<FLAC_BUFFER_SIZE>>(InputMemoryStream(buffer));
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if (!m_stream)
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m_error = LoaderError { "Can't open memory stream" };
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}
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@ -61,7 +57,7 @@ MaybeLoaderError FlacLoaderPlugin::parse_header()
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{
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InputBitStream bit_input = [&]() -> InputBitStream {
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if (m_file) {
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return InputBitStream(m_stream->get<Buffered<Core::InputFileStream>>());
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return InputBitStream(m_stream->get<Buffered<Core::InputFileStream, FLAC_BUFFER_SIZE>>());
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}
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return InputBitStream(m_stream->get<InputMemoryStream>());
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}();
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@ -19,15 +19,22 @@
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namespace Audio {
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class FlacInputStream : public Variant<Buffered<Core::InputFileStream>, InputMemoryStream> {
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// Experimentally determined to be a decent buffer size on i686:
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// 4K (the default) is slightly worse, and 64K is much worse.
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// At sufficiently large buffer sizes, the advantage of infrequent read() calls is outweighed by the memmove() overhead.
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// There was no intensive fine-tuning done to determine this value, so improvements may definitely be possible.
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constexpr size_t FLAC_BUFFER_SIZE = 8 * KiB;
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template<size_t Size = FLAC_BUFFER_SIZE>
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class FlacInputStream : public Variant<Buffered<Core::InputFileStream, Size>, InputMemoryStream> {
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public:
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using Variant<Buffered<Core::InputFileStream>, InputMemoryStream>::Variant;
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using Variant<Buffered<Core::InputFileStream, Size>, InputMemoryStream>::Variant;
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bool seek(size_t pos)
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{
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return this->visit(
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[&](Buffered<Core::InputFileStream>& buffered) {
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[&](Buffered<Core::InputFileStream, Size>& buffered) {
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// Discard the buffer, then seek normally.
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if (!buffered.discard_or_error(buffered.buffered()))
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return false;
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@ -142,7 +149,7 @@ private:
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// keep track of the start of the data in the FLAC stream to seek back more easily
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u64 m_data_start_location { 0 };
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OwnPtr<FlacInputStream> m_stream;
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OwnPtr<FlacInputStream<FLAC_BUFFER_SIZE>> m_stream;
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Optional<FlacFrameHeader> m_current_frame;
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Vector<Sample> m_current_frame_data;
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u64 m_current_sample_or_frame { 0 };
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