77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
// SPDX-License-Identifier: MPL-2.0
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// Copyright © 2020 Skyline Team and Contributors (https://github.com/skyline-emu/)
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#pragma once
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#include <deque>
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#include <kernel/types/KEvent.h>
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#include <common/circular_buffer.h>
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#include "common.h"
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namespace skyline::audio {
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/**
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* @brief The AudioTrack class manages the buffers for an audio stream
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*/
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class AudioTrack {
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private:
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std::function<void()> releaseCallback; //!< Callback called when a buffer has been played
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std::deque<BufferIdentifier> identifiers; //!< Queue of all appended buffer identifiers
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u8 channelCount;
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u32 sampleRate;
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public:
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CircularBuffer<i16, constant::SampleRate * constant::StereoChannelCount * 10> samples; //!< A circular buffer with all appended audio samples
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std::mutex bufferLock; //!< Synchronizes appending to audio buffers
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AudioOutState playbackState{AudioOutState::Stopped}; //!< The current state of playback
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u64 sampleCounter{}; //!< A counter used for tracking when buffers have been played and can be released
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/**
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* @param channelCount The amount channels that will be present in the track
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* @param sampleRate The sample rate to use for the track
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* @param releaseCallback A callback to call when a buffer has been played
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*/
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AudioTrack(u8 channelCount, u32 sampleRate, std::function<void()> releaseCallback);
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/**
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* @brief Starts audio playback using data from appended buffers
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*/
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void Start() {
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playbackState = AudioOutState::Started;
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}
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/**
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* @brief Stops audio playback, this waits for audio playback to finish before returning
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*/
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void Stop();
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/**
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* @brief Checks if a buffer has been released
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* @param tag The tag of the buffer to check
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* @return True if the given buffer hasn't been released
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*/
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bool ContainsBuffer(u64 tag);
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/**
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* @brief Gets the IDs of all newly released buffers
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* @param max The maximum amount of buffers to return
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* @return A vector containing the identifiers of the buffers
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*/
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std::vector<u64> GetReleasedBuffers(u32 max);
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/**
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* @brief Appends audio samples to the output buffer
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* @param tag The tag of the buffer
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* @param buffer A span containing the source sample buffer
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*/
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void AppendBuffer(u64 tag, span<i16> buffer = {});
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/**
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* @brief Checks if any buffers have been released and calls the appropriate callback for them
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* @note bufferLock MUST be locked when calling this
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*/
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void CheckReleasedBuffers();
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};
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}
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