mirror of
https://github.com/RGBCube/serenity
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f14a71eb34
This completely removes WavLoader's dependency on LegacyBuffer: We directly create the result sample container and write into it. I took this opportunity to rewrite most of the sample reading functions as a single templated function, which combined with the better error handling makes this "ported" code super concise.
75 lines
2.8 KiB
C++
75 lines
2.8 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/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/String.h>
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#include <AK/StringView.h>
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#include <LibAudio/Loader.h>
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#include <LibCore/File.h>
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#include <LibCore/Stream.h>
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namespace Audio {
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// constants for handling the WAV header data
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static constexpr unsigned const WAVE_FORMAT_PCM = 0x0001; // PCM
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static constexpr unsigned const WAVE_FORMAT_IEEE_FLOAT = 0x0003; // IEEE float
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static constexpr unsigned const WAVE_FORMAT_ALAW = 0x0006; // 8-bit ITU-T G.711 A-law
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static constexpr unsigned const WAVE_FORMAT_MULAW = 0x0007; // 8-bit ITU-T G.711 µ-law
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static constexpr unsigned const WAVE_FORMAT_EXTENSIBLE = 0xFFFE; // Determined by SubFormat
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// Parses and reads audio data from a WAV file.
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class WavLoaderPlugin : public LoaderPlugin {
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public:
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explicit WavLoaderPlugin(StringView path);
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explicit WavLoaderPlugin(Bytes const& buffer);
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virtual MaybeLoaderError initialize() override;
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virtual LoaderSamples get_more_samples(size_t max_samples_to_read_from_input = 128 * KiB) 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 String format_name() override { return "RIFF WAVE (.wav)"; }
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virtual PcmSampleFormat pcm_format() override { return m_sample_format; }
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virtual RefPtr<Core::File> file() override { return m_file; }
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private:
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MaybeLoaderError parse_header();
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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(Core::Stream::Stream& stream, SampleReader read_sample, FixedArray<Sample>& samples) const;
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// This is only kept around for compatibility for now.
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RefPtr<Core::File> m_file;
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OwnPtr<Core::Stream::SeekableStream> m_stream;
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// The constructor might set this so that we can initialize the data stream later.
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Optional<Bytes const&> m_backing_memory;
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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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