mirror of
https://github.com/RGBCube/serenity
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0a9fa85e86
Bytes will implicitly cast to StringView, but not to ReadonlyBytes. That means that if you call `Audio::Loader::create_plugin(mapped_file->bytes())` it will silently use the `create_plugin(StringView path)` overload. Reading audio data does not require that data to be writable, so let's use ReadonlyBytes for it and avoid the footgun.
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(ReadonlyBytes 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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