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LibAudio: New error propagation API in Loader and Buffer

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Previously, a libc-like out-of-line error information was used in the
loader and its plugins. Now, all functions that may fail to do their job
return some sort of Result. The universally-used error type ist the new
LoaderError, which can contain information about the general error
category (such as file format, I/O, unimplemented features), an error
description, and location information, such as file index or sample
index.

Additionally, the loader plugins try to do as little work as possible in
their constructors. Right after being constructed, a user should call
initialize() and check the errors returned from there. (This is done
transparently by Loader itself.) If a constructor caused an error, the
call to initialize should check and return it immediately.

This opportunity was used to rework a lot of the internal error
propagation in both loader classes, especially FlacLoader. Therefore, a
couple of other refactorings may have sneaked in as well.

The adoption of LibAudio users is minimal. Piano's adoption is not
important, as the code will receive major refactoring in the near future
anyways. SoundPlayer's adoption is also less important, as changes to
refactor it are in the works as well. aplay's adoption is the best and
may serve as an example for other users. It also includes new buffering
behavior.

Buffer also gets some attention, making it OOM-safe and thereby also
propagating its errors to the user.
This commit is contained in:
kleines Filmröllchen 2021-11-27 17:00:19 +01:00 • committed by Brian Gianforcaro
parent ec8bd8116d
commit 96d02a3e75
19 changed files with 406 additions and 397 deletions
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21
Userland/Libraries/LibAudio/Buffer.h
View file

@ -8,10 +8,14 @@
#pragma once
#include <AK/ByteBuffer.h>
#include <AK/Error.h>
#include <AK/MemoryStream.h>
#include <AK/NonnullRefPtr.h>
#include <AK/RefPtr.h>
#include <AK/String.h>
#include <AK/Types.h>
#include <AK/Vector.h>
#include <AK/kmalloc.h>
#include <LibAudio/Sample.h>
#include <LibCore/AnonymousBuffer.h>
#include <string.h>
@ -67,19 +71,20 @@ private:
// A buffer of audio samples.
class Buffer : public RefCounted<Buffer> {
public:
static NonnullRefPtr<Buffer> from_pcm_data(ReadonlyBytes data, int num_channels, PcmSampleFormat sample_format);
static NonnullRefPtr<Buffer> from_pcm_stream(InputMemoryStream& stream, int num_channels, PcmSampleFormat sample_format, int num_samples);
static NonnullRefPtr<Buffer> create_with_samples(Vector<Sample>&& samples)
static ErrorOr<NonnullRefPtr<Buffer>> from_pcm_data(ReadonlyBytes data, int num_channels, PcmSampleFormat sample_format);
static ErrorOr<NonnullRefPtr<Buffer>> from_pcm_stream(InputMemoryStream& stream, int num_channels, PcmSampleFormat sample_format, int num_samples);
static ErrorOr<NonnullRefPtr<Buffer>> create_with_samples(Vector<Sample>&& samples)
{
return adopt_ref(*new Buffer(move(samples)));
return adopt_nonnull_ref_or_enomem(new (nothrow) Buffer(move(samples)));
}
static NonnullRefPtr<Buffer> create_with_anonymous_buffer(Core::AnonymousBuffer buffer, i32 buffer_id, int sample_count)
static ErrorOr<NonnullRefPtr<Buffer>> create_with_anonymous_buffer(Core::AnonymousBuffer buffer, i32 buffer_id, int sample_count)
{
return adopt_ref(*new Buffer(move(buffer), buffer_id, sample_count));
return adopt_nonnull_ref_or_enomem(new (nothrow) Buffer(move(buffer), buffer_id, sample_count));
}
static NonnullRefPtr<Buffer> create_empty()
{
return adopt_ref(*new Buffer({}));
// If we can't allocate an empty buffer, things are in a very bad state.
return MUST(adopt_nonnull_ref_or_enomem(new (nothrow) Buffer({})));
}
const Sample* samples() const { return (const Sample*)data(); }
@ -115,6 +120,6 @@ private:
};
// This only works for double resamplers, and therefore cannot be part of the class
NonnullRefPtr<Buffer> resample_buffer(ResampleHelper<double>& resampler, Buffer const& to_resample);
ErrorOr<NonnullRefPtr<Buffer>> resample_buffer(ResampleHelper<double>& resampler, Buffer const& to_resample);
}