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