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LibAudio: Allow the MP3 plugin to be constructed from a byte buffer

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This commit is contained in:
Lucas CHOLLET 2022-10-13 15:55:21 +02:00 • committed by Linus Groh
parent bb17ee8397
commit 754b129f4a
3 changed files with 14 additions and 2 deletions
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3
Userland/Libraries/LibAudio/Loader.cpp
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@ -42,6 +42,9 @@ Result<NonnullOwnPtr<LoaderPlugin>, LoaderError> Loader::try_create(Bytes& buffe
if (auto initstate = plugin->initialize(); !initstate.is_error())
return plugin;
plugin = adopt_own(*new FlacLoaderPlugin(buffer));
if (auto initstate = plugin->initialize(); !initstate.is_error())
return plugin;
plugin = adopt_own(*new MP3LoaderPlugin(buffer));
if (auto initstate = plugin->initialize(); !initstate.is_error())
return plugin;
return LoaderError { "No loader plugin available" };

10
Userland/Libraries/LibAudio/MP3Loader.cpp
View file

@ -15,13 +15,19 @@ DSP::MDCT<12> MP3LoaderPlugin::s_mdct_12;
DSP::MDCT<36> MP3LoaderPlugin::s_mdct_36;
MP3LoaderPlugin::MP3LoaderPlugin(StringView path)
: m_path(path)
: LoaderPlugin(path)
{
}
MP3LoaderPlugin::MP3LoaderPlugin(Bytes buffer)
: m_backing_memory(buffer)
{
}
MaybeLoaderError MP3LoaderPlugin::initialize()
{
m_stream = LOADER_TRY(Core::Stream::File::open(m_path, Core::Stream::OpenMode::Read));
LOADER_TRY(LoaderPlugin::initialize());
m_bitstream = LOADER_TRY(Core::Stream::BigEndianInputBitStream::construct(*m_stream));
TRY(synchronize());

3
Userland/Libraries/LibAudio/MP3Loader.h
View file

@ -11,6 +11,7 @@
#include <AK/MemoryStream.h>
#include <AK/Tuple.h>
#include <LibCore/InputBitStream.h>
#include <LibCore/MemoryStream.h>
#include <LibCore/Stream.h>
#include <LibDSP/MDCT.h>
@ -23,6 +24,7 @@ struct ScaleFactorBand;
class MP3LoaderPlugin : public LoaderPlugin {
public:
explicit MP3LoaderPlugin(StringView path);
explicit MP3LoaderPlugin(Bytes buffer);
virtual ~MP3LoaderPlugin() = default;
virtual MaybeLoaderError initialize() override;
@ -72,6 +74,7 @@ private:
u32 m_current_frame_read;
StringView m_path;
OwnPtr<Core::Stream::SeekableStream> m_stream;
Optional<Bytes const&> m_backing_memory;
OwnPtr<Core::Stream::BigEndianInputBitStream> m_bitstream;
DuplexMemoryStream m_bit_reservoir;
};