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70 lines
2.6 KiB
C++
70 lines
2.6 KiB
C++
/*
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* Copyright (c) 2023, kleines Filmröllchen <filmroellchen@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include "Loader.h"
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#include "QOATypes.h"
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#include "SampleFormats.h"
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#include <AK/Error.h>
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#include <AK/NonnullOwnPtr.h>
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#include <AK/Span.h>
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#include <AK/Types.h>
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namespace Audio {
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// Decoder for the Quite Okay Audio (QOA) format.
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// NOTE: The QOA format is not finalized yet and this decoder might not be fully spec-compliant as of 2023-02-02.
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//
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// https://github.com/phoboslab/qoa/blob/master/qoa.h
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class QOALoaderPlugin : public LoaderPlugin {
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public:
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explicit QOALoaderPlugin(NonnullOwnPtr<AK::SeekableStream> stream);
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virtual ~QOALoaderPlugin() override = default;
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static bool sniff(SeekableStream& stream);
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static ErrorOr<NonnullOwnPtr<LoaderPlugin>, LoaderError> create(NonnullOwnPtr<SeekableStream>);
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virtual ErrorOr<Vector<FixedArray<Sample>>, LoaderError> load_chunks(size_t samples_to_read_from_input) override;
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virtual MaybeLoaderError reset() override;
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virtual MaybeLoaderError seek(int sample_index) override;
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virtual int loaded_samples() override { return static_cast<int>(m_loaded_samples); }
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virtual int total_samples() override { return static_cast<int>(m_total_samples); }
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virtual u32 sample_rate() override { return m_sample_rate; }
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virtual u16 num_channels() override { return m_num_channels; }
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virtual ByteString format_name() override { return "Quite Okay Audio (.qoa)"; }
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virtual PcmSampleFormat pcm_format() override { return PcmSampleFormat::Int16; }
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private:
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enum class IsFirstFrame : bool {
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Yes = true,
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No = false,
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};
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MaybeLoaderError initialize();
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MaybeLoaderError parse_header();
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MaybeLoaderError load_one_frame(Span<Sample>& target, IsFirstFrame is_first_frame = IsFirstFrame::No);
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// Updates predictor values in lms_state so the next slice can reuse the same state.
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MaybeLoaderError read_one_slice(QOA::LMSState& lms_state, Span<i16>& samples);
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static ALWAYS_INLINE QOA::UnpackedSlice unpack_slice(QOA::PackedSlice packed_slice);
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// QOA's division routine for scaling residuals before final quantization.
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static ALWAYS_INLINE i16 qoa_divide(i16 value, i16 scale_factor);
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// Because QOA has dynamic sample rate and channel count, we only use the sample rate and channel count from the first frame.
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u32 m_sample_rate { 0 };
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u8 m_num_channels { 0 };
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// If this is the case (the reference encoder even enforces it at the moment)
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bool m_has_uniform_channel_count { true };
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size_t m_loaded_samples { 0 };
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size_t m_total_samples { 0 };
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};
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}
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