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119 lines
2.3 KiB
119 lines
2.3 KiB
/*
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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 <stdint.h>
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#include <cstdint>
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#include <optional>
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#include <string>
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#include <string_view>
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#include <type_traits>
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#include <utility>
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#include <variant>
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#include "freertos/FreeRTOS.h"
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#include "freertos/ringbuf.h"
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#include "freertos/stream_buffer.h"
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#include "result.hpp"
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#include "span.hpp"
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#include "types.hpp"
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namespace audio {
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struct StreamInfo {
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// The number of bytes that are available for consumption within this
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// stream's buffer.
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std::size_t bytes_in_stream{0};
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bool is_producer_finished = true;
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bool is_consumer_finished = true;
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std::optional<std::uint32_t> duration_seconds;
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std::optional<std::uint32_t> seek_to_seconds{};
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struct Encoded {
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// The codec that this stream is associated with.
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codecs::StreamType type;
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std::optional<std::size_t> duration_bytes;
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bool operator==(const Encoded&) const = default;
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};
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struct Pcm {
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// Number of channels in this stream.
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uint8_t channels;
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// Number of bits per sample.
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uint8_t bits_per_sample;
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// The sample rate.
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uint32_t sample_rate;
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bool operator==(const Pcm&) const = default;
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};
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typedef std::variant<std::monostate, Encoded, Pcm> Format;
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Format format{};
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bool operator==(const StreamInfo&) const = default;
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};
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class RawStream {
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public:
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StreamInfo* info;
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cpp::span<std::byte> data;
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RawStream(StreamInfo* i, cpp::span<std::byte> d) : info(i), data(d) {}
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};
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/*
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* A byte buffer + associated metadata, which is not allowed to modify any of
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* the underlying data.
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*/
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class InputStream {
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public:
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explicit InputStream(RawStream* s) : raw_(s) {}
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void consume(std::size_t bytes) const;
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bool is_producer_finished() const;
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void mark_consumer_finished() const;
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const StreamInfo& info() const;
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cpp::span<const std::byte> data() const;
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private:
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RawStream* raw_;
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};
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class OutputStream {
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public:
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explicit OutputStream(RawStream* s) : raw_(s) {}
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void add(std::size_t bytes) const;
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bool prepare(const StreamInfo::Format& new_format);
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void set_duration(std::size_t);
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const StreamInfo& info() const;
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cpp::span<std::byte> data() const;
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bool is_consumer_finished() const;
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void mark_producer_finished() const;
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private:
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RawStream* raw_;
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};
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} // namespace audio
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