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53 lines
1.1 KiB
53 lines
1.1 KiB
2 years ago
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/*
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* Copyright 2023 jacqueline <me@jacqueline.id.au>
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*
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* SPDX-License-Identifier: GPL-3.0-only
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*/
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#pragma once
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#include <cstddef>
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#include <cstdint>
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#include <memory>
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#include "freertos/FreeRTOS.h"
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#include "ff.h"
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#include "freertos/stream_buffer.h"
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#include "audio_source.hpp"
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#include "codec.hpp"
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#include "tasks.hpp"
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namespace audio {
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/*
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* Wraps another stream, proactively buffering large chunks of it into memory
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* at a time.
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*/
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class ReadaheadSource : public codecs::IStream {
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public:
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ReadaheadSource(tasks::Worker&, std::unique_ptr<codecs::IStream>);
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~ReadaheadSource();
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auto Read(cpp::span<std::byte> dest) -> ssize_t override;
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auto CanSeek() -> bool override;
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auto SeekTo(int64_t destination, SeekFrom from) -> void override;
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auto CurrentPosition() -> int64_t override;
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ReadaheadSource(const ReadaheadSource&) = delete;
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ReadaheadSource& operator=(const ReadaheadSource&) = delete;
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private:
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tasks::Worker& worker_;
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std::unique_ptr<codecs::IStream> wrapped_;
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std::atomic<bool> is_refilling_;
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StreamBufferHandle_t buffer_;
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int64_t tell_;
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};
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} // namespace audio
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