mirror of
https://github.com/RGBCube/serenity
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5f1dbbaaa6
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.
64 lines
2.4 KiB
C++
64 lines
2.4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, 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 <AK/DeprecatedString.h>
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#include <AK/FixedArray.h>
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#include <AK/OwnPtr.h>
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#include <AK/RefPtr.h>
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#include <AK/Span.h>
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#include <AK/StringView.h>
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#include <LibAudio/Loader.h>
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#include <LibAudio/RIFFTypes.h>
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namespace Audio {
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// Loader for the WAVE (file extension .wav) uncompressed audio file format.
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// WAVE uses the Microsoft RIFF container.
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// Original RIFF Spec, without later extensions: https://www.aelius.com/njh/wavemetatools/doc/riffmci.pdf
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// More concise WAVE information plus various spec links: http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/WAVE.html
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class WavLoaderPlugin : public LoaderPlugin {
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public:
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explicit WavLoaderPlugin(NonnullOwnPtr<SeekableStream> stream);
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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 { return seek(0); }
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// sample_index 0 is the start of the raw audio sample data
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// within the file/stream.
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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 DeprecatedString format_name() override { return "RIFF WAVE (.wav)"; }
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virtual PcmSampleFormat pcm_format() override { return m_sample_format; }
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private:
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MaybeLoaderError parse_header();
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MaybeLoaderError load_wav_info_block(Vector<RIFF::Chunk> info_chunks);
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LoaderSamples samples_from_pcm_data(Bytes const& data, size_t samples_to_read) const;
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template<typename SampleReader>
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MaybeLoaderError read_samples_from_stream(Stream& stream, SampleReader read_sample, FixedArray<Sample>& samples) const;
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u32 m_sample_rate { 0 };
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u16 m_num_channels { 0 };
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PcmSampleFormat m_sample_format;
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size_t m_byte_offset_of_data_samples { 0 };
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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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