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489d0366d9
This can reduce audio latency according to https://developer.android.com/ndk/guides/audio/opensl/opensl-prog-notes#perform. Previously we were using the hardcoded values of 48000 Hz and 256 frames per buffer. The sample rate we use with this change is 48000 Hz on all devices I'm aware of, but the buffer size does vary across devices. Terminology note: The old code used the term "sample" to refer to what Android refers to as a "frame". "Frame" is a clearer term to use for this, so I've changed OpenSLESStream's terminology. One frame consists of one sample per channel.
48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
// Copyright 2008 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#ifdef HAVE_OPENSL_ES
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#include <array>
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#include <vector>
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#include <SLES/OpenSLES.h>
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#include <SLES/OpenSLES_Android.h>
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#endif // HAVE_OPENSL_ES
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#include "AudioCommon/SoundStream.h"
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class OpenSLESStream final : public SoundStream
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{
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#ifdef HAVE_OPENSL_ES
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public:
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~OpenSLESStream() override;
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bool Init() override;
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bool SetRunning(bool running) override;
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void SetVolume(int volume) override;
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static bool IsValid() { return true; }
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private:
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static void BQPlayerCallback(SLAndroidSimpleBufferQueueItf bq, void* context);
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void PushSamples(SLAndroidSimpleBufferQueueItf bq);
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// engine interfaces
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SLObjectItf m_engine_object;
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SLEngineItf m_engine_engine;
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SLObjectItf m_output_mix_object;
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// buffer queue player interfaces
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SLObjectItf m_bq_player_object = nullptr;
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SLPlayItf m_bq_player_play;
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SLAndroidSimpleBufferQueueItf m_bq_player_buffer_queue;
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SLVolumeItf m_bq_player_volume;
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SLuint32 m_frames_per_buffer;
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SLuint32 m_bytes_per_buffer;
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// Double buffering.
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std::array<std::vector<short>, 2> m_buffer;
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int m_current_buffer = 0;
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#endif // HAVE_OPENSL_ES
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};
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