ladybird/Userland/Libraries/LibAudio/WavLoader.h

/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include <AK/ByteBuffer.h>
#include <AK/MemoryStream.h>
#include <AK/OwnPtr.h>
#include <AK/RefPtr.h>
#include <AK/String.h>
#include <AK/StringView.h>
#include <LibAudio/Buffer.h>
#include <LibAudio/Loader.h>
#include <LibCore/File.h>

namespace Audio {
class Buffer;

// Parses a WAV file and produces an Audio::Buffer.
class WavLoaderPlugin : public LoaderPlugin {
public:
    WavLoaderPlugin(const StringView& path);
    WavLoaderPlugin(const ByteBuffer& buffer);

    virtual bool sniff() override;

    virtual bool has_error() override { return !m_error_string.is_null(); }
    virtual const char* error_string() override { return m_error_string.characters(); }

    virtual RefPtr<Buffer> get_more_samples(size_t max_bytes_to_read_from_input = 128 * KiB) override;

    virtual void reset() override;
    virtual void seek(const int position) override;

    virtual int loaded_samples() override { return m_loaded_samples; }
    virtual int total_samples() override { return m_total_samples; }
    virtual u32 sample_rate() override { return m_sample_rate; }
    virtual u16 num_channels() override { return m_num_channels; }
    virtual u16 bits_per_sample() override { return m_bits_per_sample; }
    virtual RefPtr<Core::File> file() override { return m_file; }

private:
    bool parse_header();

    bool valid { false };
    RefPtr<Core::File> m_file;
    OwnPtr<InputMemoryStream> m_stream;
    String m_error_string;
    OwnPtr<ResampleHelper> m_resampler;

    u32 m_sample_rate { 0 };
    u16 m_num_channels { 0 };
    u16 m_bits_per_sample { 0 };

    int m_loaded_samples { 0 };
    int m_total_samples { 0 };
};

}