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/*
* Copyright (c) 2018-2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/ByteBuffer.h>
#include <AK/NonnullOwnPtr.h>
#include <AK/NonnullRefPtr.h>
#include <AK/RefCounted.h>
#include <AK/RefPtr.h>
#include <AK/Result.h>
#include <AK/StringView.h>
#include <AK/Try.h>
#include <LibAudio/Buffer.h>
#include <LibAudio/LoaderError.h>
#include <LibCore/File.h>
namespace Audio {
static const String empty_string = "";
static String no_plugin_error = "No loader plugin available";
using LoaderSamples = Result<NonnullRefPtr<Buffer>, LoaderError>;
using MaybeLoaderError = Result<void, LoaderError>;
class LoaderPlugin {
public:
virtual ~LoaderPlugin() { }
virtual MaybeLoaderError initialize() = 0;
virtual LoaderSamples get_more_samples(size_t max_bytes_to_read_from_input = 128 * KiB) = 0;
virtual MaybeLoaderError reset() = 0;
virtual MaybeLoaderError seek(const int sample_index) = 0;
// total_samples() and loaded_samples() should be independent
// of the number of channels.
//
// For example, with a three-second-long, stereo, 44.1KHz audio file:
// num_channels() should return 2
// sample_rate() should return 44100 (each channel is sampled at this rate)
// total_samples() should return 132300 (sample_rate * three seconds)
virtual int loaded_samples() = 0;
virtual int total_samples() = 0;
virtual u32 sample_rate() = 0;
virtual u16 num_channels() = 0;
virtual PcmSampleFormat pcm_format() = 0;
virtual RefPtr<Core::File> file() = 0;
};
class Loader : public RefCounted<Loader> {
public:
static Result<NonnullRefPtr<Loader>, LoaderError> create(StringView path) { return adopt_ref(*new Loader(TRY(try_create(path)))); }
static Result<NonnullRefPtr<Loader>, LoaderError> create(ByteBuffer const& buffer) { return adopt_ref(*new Loader(TRY(try_create(buffer)))); }
LoaderSamples get_more_samples(size_t max_bytes_to_read_from_input = 128 * KiB) const { return m_plugin->get_more_samples(max_bytes_to_read_from_input); }
MaybeLoaderError reset() const { return m_plugin->reset(); }
MaybeLoaderError seek(const int position) const { return m_plugin->seek(position); }
int loaded_samples() const { return m_plugin->loaded_samples(); }
int total_samples() const { return m_plugin->total_samples(); }
u32 sample_rate() const { return m_plugin->sample_rate(); }
u16 num_channels() const { return m_plugin->num_channels(); }
u16 bits_per_sample() const { return pcm_bits_per_sample(m_plugin->pcm_format()); }
RefPtr<Core::File> file() const { return m_plugin->file(); }
private:
static Result<NonnullOwnPtr<LoaderPlugin>, LoaderError> try_create(StringView path);
static Result<NonnullOwnPtr<LoaderPlugin>, LoaderError> try_create(ByteBuffer const& buffer);
explicit Loader(NonnullOwnPtr<LoaderPlugin>);
mutable NonnullOwnPtr<LoaderPlugin> m_plugin;
};
}
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