100 lines
3 KiB
C++
100 lines
3 KiB
C++
// Copyright 2018 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <functional>
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#include <memory>
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#include <vector>
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#include <queue>
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#include "audio_core/buffer.h"
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#include "common/assert.h"
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#include "common/common_types.h"
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#include "core/core_timing.h"
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namespace AudioCore {
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/**
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* Represents an audio stream, which is a sequence of queued buffers, to be outputed by AudioOut
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*/
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class Stream {
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public:
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/// Audio format of the stream
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enum class Format {
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Mono16,
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Stereo16,
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Multi51Channel16,
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};
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/// Callback function type, used to change guest state on a buffer being released
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using ReleaseCallback = std::function<void()>;
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Stream(int sample_rate, Format format, ReleaseCallback&& release_callback);
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/// Plays the audio stream
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void Play();
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/// Stops the audio stream
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void Stop();
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/// Queues a buffer into the audio stream, returns true on success
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bool QueueBuffer(BufferPtr&& buffer);
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/// Returns true if the audio stream contains a buffer with the specified tag
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bool ContainsBuffer(Buffer::Tag tag) const;
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/// Returns a vector of recently released buffers specified by tag
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std::vector<Buffer::Tag> GetTagsAndReleaseBuffers(size_t max_count);
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/// Returns true if the stream is currently playing
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bool IsPlaying() const {
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return state == State::Playing;
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}
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/// Returns the number of queued buffers
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size_t GetQueueSize() const {
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return queued_buffers.size();
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}
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/// Gets the sample rate
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u32 GetSampleRate() const {
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return sample_rate;
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}
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/// Gets the number of channels
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u32 GetNumChannels() const;
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/// Gets the sample size in bytes
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u32 GetSampleSize() const;
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private:
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/// Current state of the stream
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enum class State {
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Stopped,
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Playing,
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};
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/// Plays the next queued buffer in the audio stream, starting playback if necessary
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void PlayNextBuffer();
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/// Releases the actively playing buffer, signalling that it has been completed
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void ReleaseActiveBuffer();
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/// Gets the number of core cycles when the specified buffer will be released
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s64 GetBufferReleaseCycles(const Buffer& buffer) const;
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int sample_rate; ///< Sample rate of the stream
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Format format; ///< Format of the stream
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ReleaseCallback release_callback; ///< Buffer release callback for the stream
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State state{State::Stopped}; ///< Playback state of the stream
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CoreTiming::EventType* release_event{}; ///< Core timing release event for the stream
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BufferPtr active_buffer; ///< Actively playing buffer in the stream
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std::queue<BufferPtr> queued_buffers; ///< Buffers queued to be played in the stream
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std::queue<BufferPtr> released_buffers; ///< Buffers recently released from the stream
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};
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using StreamPtr = std::shared_ptr<Stream>;
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} // namespace AudioCore
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