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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, kleines Filmröllchen <filmroellchen@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/FixedArray.h>
#include <AK/OwnPtr.h>
#include <AK/RefPtr.h>
#include <AK/Span.h>
#include <AK/String.h>
#include <AK/StringView.h>
#include <LibAudio/Loader.h>
#include <LibCore/File.h>
#include <LibCore/Stream.h>
namespace Audio {
// constants for handling the WAV header data
static constexpr unsigned const WAVE_FORMAT_PCM = 0x0001; // PCM
static constexpr unsigned const WAVE_FORMAT_IEEE_FLOAT = 0x0003; // IEEE float
static constexpr unsigned const WAVE_FORMAT_ALAW = 0x0006; // 8-bit ITU-T G.711 A-law
static constexpr unsigned const WAVE_FORMAT_MULAW = 0x0007; // 8-bit ITU-T G.711 µ-law
static constexpr unsigned const WAVE_FORMAT_EXTENSIBLE = 0xFFFE; // Determined by SubFormat
// Parses and reads audio data from a WAV file.
class WavLoaderPlugin : public LoaderPlugin {
public:
explicit WavLoaderPlugin(OwnPtr<Core::Stream::SeekableStream> stream);
static Result<NonnullOwnPtr<WavLoaderPlugin>, LoaderError> try_create(StringView path);
static Result<NonnullOwnPtr<WavLoaderPlugin>, LoaderError> try_create(Bytes buffer);
virtual LoaderSamples get_more_samples(size_t max_samples_to_read_from_input = 128 * KiB) override;
virtual MaybeLoaderError reset() override { return seek(0); }
// sample_index 0 is the start of the raw audio sample data
// within the file/stream.
virtual MaybeLoaderError seek(int sample_index) override;
virtual int loaded_samples() override { return static_cast<int>(m_loaded_samples); }
virtual int total_samples() override { return static_cast<int>(m_total_samples); }
virtual u32 sample_rate() override { return m_sample_rate; }
virtual u16 num_channels() override { return m_num_channels; }
virtual String format_name() override { return "RIFF WAVE (.wav)"; }
virtual PcmSampleFormat pcm_format() override { return m_sample_format; }
private:
MaybeLoaderError initialize();
MaybeLoaderError parse_header();
LoaderSamples samples_from_pcm_data(Bytes const& data, size_t samples_to_read) const;
template<typename SampleReader>
MaybeLoaderError read_samples_from_stream(Core::Stream::Stream& stream, SampleReader read_sample, FixedArray<Sample>& samples) const;
u32 m_sample_rate { 0 };
u16 m_num_channels { 0 };
PcmSampleFormat m_sample_format;
size_t m_byte_offset_of_data_samples { 0 };
size_t m_loaded_samples { 0 };
size_t m_total_samples { 0 };
};
}
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