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/*
* Copyright 2023 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#pragma once
#include <cstdint>
#include <memory>
#include "audio_converter.hpp"
#include "audio_events.hpp"
#include "audio_sink.hpp"
#include "audio_source.hpp"
#include "codec.hpp"
#include "track.hpp"
#include "types.hpp"
namespace audio {
/*
* Sample-based timer for the current elapsed playback time.
*/
class Timer {
public:
Timer(std::shared_ptr<Track>, const codecs::ICodec::OutputFormat& format, uint32_t current_seconds = 0);
auto AddSamples(std::size_t) -> void;
private:
std::shared_ptr<Track> track_;
uint32_t current_seconds_;
uint32_t current_sample_in_second_;
uint32_t samples_per_second_;
uint32_t total_duration_seconds_;
};
/*
* Handle to a persistent task that takes bytes from the given source, decodes
* them into sample::Sample (normalised to 16 bit signed PCM), and then
* forwards the resulting stream to the given converter.
*/
class Decoder {
public:
static auto Start(std::shared_ptr<IAudioSource> source,
std::shared_ptr<SampleConverter> converter) -> Decoder*;
auto Main() -> void;
Decoder(const Decoder&) = delete;
Decoder& operator=(const Decoder&) = delete;
private:
Decoder(std::shared_ptr<IAudioSource> source,
std::shared_ptr<SampleConverter> converter);
auto BeginDecoding(std::shared_ptr<TaggedStream>) -> bool;
auto ContinueDecoding() -> bool;
std::shared_ptr<IAudioSource> source_;
std::shared_ptr<SampleConverter> converter_;
std::shared_ptr<codecs::IStream> stream_;
std::unique_ptr<codecs::ICodec> codec_;
std::unique_ptr<Timer> timer_;
std::optional<codecs::ICodec::OutputFormat> current_format_;
std::optional<IAudioOutput::Format> current_sink_format_;
cpp::span<sample::Sample> codec_buffer_;
};
} // namespace audio
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