mirror of
https://github.com/hajimehoshi/ebiten.git
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122 lines
3.9 KiB
C++
Vendored
122 lines
3.9 KiB
C++
Vendored
/*
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* Copyright 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef OBOE_QUIRKS_MANAGER_H
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#define OBOE_QUIRKS_MANAGER_H
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#include <memory>
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#include "oboe_oboe_AudioStreamBuilder_android.h"
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#include "oboe_aaudio_AudioStreamAAudio_android.h"
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namespace oboe {
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/**
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* INTERNAL USE ONLY.
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*
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* Based on manufacturer, model and Android version number
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* decide whether data conversion needs to occur.
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*
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* This also manages device and version specific workarounds.
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*/
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class QuirksManager {
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public:
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static QuirksManager &getInstance() {
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static QuirksManager instance; // singleton
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return instance;
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}
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QuirksManager();
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virtual ~QuirksManager() = default;
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/**
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* Do we need to do channel, format or rate conversion to provide a low latency
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* stream for this builder? If so then provide a builder for the native child stream
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* that will be used to get low latency.
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*
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* @param builder builder provided by application
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* @param childBuilder modified builder appropriate for the underlying device
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* @return true if conversion is needed
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*/
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bool isConversionNeeded(const AudioStreamBuilder &builder, AudioStreamBuilder &childBuilder);
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static bool isMMapUsed(AudioStream &stream) {
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bool answer = false;
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if (stream.getAudioApi() == AudioApi::AAudio) {
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AudioStreamAAudio *streamAAudio =
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reinterpret_cast<AudioStreamAAudio *>(&stream);
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answer = streamAAudio->isMMapUsed();
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}
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return answer;
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}
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virtual int32_t clipBufferSize(AudioStream &stream, int32_t bufferSize) {
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return mDeviceQuirks->clipBufferSize(stream, bufferSize);
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}
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class DeviceQuirks {
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public:
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virtual ~DeviceQuirks() = default;
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/**
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* Restrict buffer size. This is mainly to avoid glitches caused by MMAP
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* timestamp inaccuracies.
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* @param stream
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* @param requestedSize
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* @return
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*/
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int32_t clipBufferSize(AudioStream &stream, int32_t requestedSize);
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// Exclusive MMAP streams can have glitches because they are using a timing
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// model of the DSP to control IO instead of direct synchronization.
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virtual int32_t getExclusiveBottomMarginInBursts() const {
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return kDefaultBottomMarginInBursts;
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}
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virtual int32_t getExclusiveTopMarginInBursts() const {
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return kDefaultTopMarginInBursts;
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}
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// On some devices, you can open a mono stream but it is actually running in stereo!
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virtual bool isMonoMMapActuallyStereo() const {
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return false;
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}
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virtual bool isAAudioMMapPossible(const AudioStreamBuilder &builder) const;
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static constexpr int32_t kDefaultBottomMarginInBursts = 0;
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static constexpr int32_t kDefaultTopMarginInBursts = 0;
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// For Legacy streams, do not let the buffer go below one burst.
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// b/129545119 | AAudio Legacy allows setBufferSizeInFrames too low
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// Fixed in Q
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static constexpr int32_t kLegacyBottomMarginInBursts = 1;
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static constexpr int32_t kCommonNativeRate = 48000; // very typical native sample rate
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};
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private:
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static constexpr int32_t kChannelCountMono = 1;
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static constexpr int32_t kChannelCountStereo = 2;
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std::unique_ptr<DeviceQuirks> mDeviceQuirks{};
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};
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}
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#endif //OBOE_QUIRKS_MANAGER_H
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