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7977fbb9c5
Cubeb uses internal rate resampler and it's not being flushed during call to stream_stop. This results in noticeable click when emulator is unpaused. Reset last sample buffer on pause for all backends.
101 lines
2.3 KiB
C++
101 lines
2.3 KiB
C++
#pragma once
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#include "util/types.hpp"
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#include "Utilities/StrFmt.h"
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enum : u32
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{
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DEFAULT_AUDIO_SAMPLING_RATE = 48000,
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MAX_AUDIO_BUFFERS = 64,
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AUDIO_BUFFER_SAMPLES = 256,
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AUDIO_MAX_CHANNELS = 8,
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};
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enum class AudioFreq : u32
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{
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FREQ_32K = 32000,
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FREQ_44K = 44100,
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FREQ_48K = 48000,
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FREQ_88K = 88200,
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FREQ_96K = 96000,
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FREQ_176K = 176400,
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FREQ_192K = 192000,
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};
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enum class AudioSampleSize : u32
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{
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FLOAT = sizeof(float),
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S16 = sizeof(s16),
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};
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enum class AudioChannelCnt : u32
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{
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STEREO = 2,
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SURROUND_5_1 = 6,
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SURROUND_7_1 = 8,
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};
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class AudioBackend
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{
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public:
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AudioBackend();
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virtual ~AudioBackend() = default;
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/*
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* Pure virtual methods
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*/
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virtual std::string_view GetName() const = 0;
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virtual void Open(AudioFreq freq, AudioSampleSize sample_size, AudioChannelCnt ch_cnt) = 0;
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virtual void Close() = 0;
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// Sets write callback. It's called when backend requests new data to be sent
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// Callback should return number of submitted bytes. Calling other backend functions from callback is unsafe
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virtual void SetWriteCallback(std::function<u32(u32 /* byte_cnt */, void * /* buffer */)> cb) = 0;
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// Returns length of one callback frame in seconds.
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virtual f64 GetCallbackFrameLen() = 0;
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// Returns true if audio is currently being played, false otherwise
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virtual bool IsPlaying() = 0;
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// Start playing enqueued data
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virtual void Play() = 0;
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// Pause playing enqueued data
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virtual void Pause() = 0;
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/*
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* This virtual method should be reimplemented if backend can fail to be initialized under non-error conditions
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* eg. when there is no audio devices attached
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*/
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virtual bool Initialized() { return true; }
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/*
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* This virtual method should be reimplemented if backend can fail during normal operation
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*/
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virtual bool Operational() { return true; }
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/*
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* Helper methods
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*/
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u32 get_sampling_rate() const;
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u32 get_sample_size() const;
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u32 get_channels() const;
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bool get_convert_to_s16() const;
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/*
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* Convert float buffer to s16 one. src and dst could be the same. cnt is number of buffer elements.
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*/
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static void convert_to_s16(u32 cnt, const f32* src, void* dst);
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protected:
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AudioSampleSize m_sample_size = AudioSampleSize::FLOAT;
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AudioFreq m_sampling_rate = AudioFreq::FREQ_48K;
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AudioChannelCnt m_channels = AudioChannelCnt::STEREO;
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};
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