113 lines
4.1 KiB
C++
113 lines
4.1 KiB
C++
/*
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* Copyright 2016 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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#include "oboe/AudioStreamBuilder.h"
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#include <sys/types.h>
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#include "CoreMinimal.h"
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#include "aaudio/AudioStreamAAudio.h"
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#include "OboeDebug.h"
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#include "oboe/Oboe.h"
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#include "opensles/AudioInputStreamOpenSLES.h"
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#include "opensles/AudioOutputStreamOpenSLES.h"
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#include "opensles/AudioStreamOpenSLES.h"
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namespace oboe {
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/**
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* The following default values are used when oboe does not have any better way of determining the optimal values
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* for an audio stream. This can happen when:
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*
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* - Client is creating a stream on API < 26 (OpenSLES) but has not supplied the optimal sample
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* rate and/or frames per burst
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* - Client is creating a stream on API 16 (OpenSLES) where AudioManager.PROPERTY_OUTPUT_* values
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* are not available
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*/
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int32_t DefaultStreamValues::SampleRate = 48000; // Common rate for mobile audio and video
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int32_t DefaultStreamValues::FramesPerBurst = 192; // 4 msec at 48000 Hz
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int32_t DefaultStreamValues::ChannelCount = 2; // Stereo
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constexpr int kBufferSizeInBurstsForLowLatencyStreams = 2;
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#ifndef OBOE_ENABLE_AAUDIO
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// Set OBOE_ENABLE_AAUDIO to 0 if you want to disable the AAudio API.
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// This might be useful if you want to force all the unit tests to use OpenSL ES.
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#define OBOE_ENABLE_AAUDIO 1
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#endif
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bool AudioStreamBuilder::isAAudioSupported() {
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return AudioStreamAAudio::isSupported() && OBOE_ENABLE_AAUDIO;
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}
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bool AudioStreamBuilder::isAAudioRecommended() {
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// See https://github.com/google/oboe/issues/40,
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// AAudio may not be stable on Android O, depending on how it is used.
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// To be safe, use AAudio only on O_MR1 and above.
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return (getSdkVersion() >= __ANDROID_API_O_MR1__) && isAAudioSupported();
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}
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AudioStream *AudioStreamBuilder::build() {
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AudioStream *stream = nullptr;
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if (mAudioApi == AudioApi::AAudio && isAAudioSupported()) {
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stream = new AudioStreamAAudio(*this);
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// If unspecified, only use AAudio if recommended.
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} else if (mAudioApi == AudioApi::Unspecified && isAAudioRecommended()) {
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stream = new AudioStreamAAudio(*this);
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} else {
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if (getDirection() == oboe::Direction::Output) {
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stream = new AudioOutputStreamOpenSLES(*this);
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} else if (getDirection() == oboe::Direction::Input) {
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stream = new AudioInputStreamOpenSLES(*this);
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}
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}
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return stream;
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}
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Result AudioStreamBuilder::openStream(AudioStream **streamPP) {
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LOGD("%s() %s -------- %s --------",
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__func__, getDirection() == Direction::Input ? "INPUT" : "OUTPUT", getVersionText());
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if (streamPP == nullptr) {
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return Result::ErrorNull;
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}
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*streamPP = nullptr;
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AudioStream *streamP = build();
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if (streamP == nullptr) {
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return Result::ErrorNull;
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}
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Result result = streamP->open(); // TODO review API
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if (result == Result::OK) {
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// Use a reasonable default buffer size for low latency streams.
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if (streamP->getPerformanceMode() == PerformanceMode::LowLatency){
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int32_t optimalBufferSize = streamP->getFramesPerBurst() *
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kBufferSizeInBurstsForLowLatencyStreams;
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auto setBufferResult = streamP->setBufferSizeInFrames(optimalBufferSize);
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if (!setBufferResult){
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LOGW("Failed to set buffer size to %d. Error was %s",
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optimalBufferSize,
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convertToText(setBufferResult.error()));
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}
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}
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*streamPP = streamP;
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} else {
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delete streamP;
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}
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return result;
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}
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} // namespace oboe
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