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LibAudio: Extract loader stream creation from the plugins

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This removes a lot of duplicated stream creation code from the plugins,
and also simplifies the way that the appropriate plugin is found. This
mirrors the ImageDecoderPlugin design and necessitates new sniffing
methods on the loaders.
This commit is contained in:
kleines Filmröllchen 2023-06-24 17:04:38 +02:00 • committed by Sam Atkins
parent dfd48ab643
commit 5f1dbbaaa6
15 changed files with 124 additions and 131 deletions
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11
Userland/Libraries/LibAudio/Loader.h
View file

@ -6,12 +6,12 @@
#pragma once
#include <AK/Error.h>
#include <AK/FixedArray.h>
#include <AK/NonnullOwnPtr.h>
#include <AK/NonnullRefPtr.h>
#include <AK/RefCounted.h>
#include <AK/RefPtr.h>
#include <AK/Result.h>
#include <AK/Span.h>
#include <AK/Stream.h>
#include <AK/StringView.h>
@ -24,8 +24,6 @@
namespace Audio {
static constexpr StringView no_plugin_error = "No loader plugin available"sv;
// Experimentally determined to be a decent buffer size on i686:
// 4K (the default) is slightly worse, and 64K is much worse.
// At sufficiently large buffer sizes, the advantage of infrequent read() calls is outweighed by the memmove() overhead.
@ -87,8 +85,8 @@ protected:
class Loader : public RefCounted<Loader> {
public:
static Result<NonnullRefPtr<Loader>, LoaderError> create(StringView path) { return adopt_ref(*new Loader(TRY(create_plugin(path)))); }
static Result<NonnullRefPtr<Loader>, LoaderError> create(Bytes buffer) { return adopt_ref(*new Loader(TRY(create_plugin(buffer)))); }
static ErrorOr<NonnullRefPtr<Loader>, LoaderError> create(StringView path);
static ErrorOr<NonnullRefPtr<Loader>, LoaderError> create(Bytes buffer);
// Will only read less samples if we're at the end of the stream.
LoaderSamples get_more_samples(size_t samples_to_read_from_input = 128 * KiB);
@ -111,8 +109,7 @@ public:
Vector<PictureData> const& pictures() const { return m_plugin->pictures(); };
private:
static Result<NonnullOwnPtr<LoaderPlugin>, LoaderError> create_plugin(StringView path);
static Result<NonnullOwnPtr<LoaderPlugin>, LoaderError> create_plugin(Bytes buffer);
static ErrorOr<NonnullOwnPtr<LoaderPlugin>, LoaderError> create_plugin(NonnullOwnPtr<SeekableStream> stream);
explicit Loader(NonnullOwnPtr<LoaderPlugin>);