4e65e07e41
Besides being ~40% the size of the previous implementation, this makes it so that VideoCaptureAndroid can stop and restart capture, which is necessary to support onPause/onResume reasonably on Android. BUG=1407 R=henrike@webrtc.org, wu@webrtc.org Review URL: https://webrtc-codereview.appspot.com/2334004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@4915 4adac7df-926f-26a2-2b94-8c16560cd09d
72 lines
2.8 KiB
C++
72 lines
2.8 KiB
C++
/*
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* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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// Android APIs used to access Java functionality needed to enable low latency
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// audio.
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#ifndef WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_AUDIO_MANAGER_JNI_H_
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#define WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_AUDIO_MANAGER_JNI_H_
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#include <jni.h>
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namespace webrtc {
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class AudioManagerJni {
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public:
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AudioManagerJni();
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~AudioManagerJni() {}
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// SetAndroidAudioDeviceObjects must only be called once unless there has
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// been a successive call to ClearAndroidAudioDeviceObjects. For each
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// call to ClearAndroidAudioDeviceObjects, SetAndroidAudioDeviceObjects may be
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// called once.
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// This function must be called by a Java thread as calling it from a thread
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// created by the native application will prevent FindClass from working. See
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// http://developer.android.com/training/articles/perf-jni.html#faq_FindClass
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// for more details.
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// It has to be called for this class' APIs to be successful. Calling
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// ClearAndroidAudioDeviceObjects will prevent this class' APIs to be called
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// successfully if SetAndroidAudioDeviceObjects is not called after it.
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static void SetAndroidAudioDeviceObjects(void* jvm, void* env,
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void* context);
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// This function must be called when the AudioManagerJni class is no
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// longer needed. It frees up the global references acquired in
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// SetAndroidAudioDeviceObjects.
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static void ClearAndroidAudioDeviceObjects();
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bool low_latency_supported() const { return low_latency_supported_; }
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int native_output_sample_rate() const { return native_output_sample_rate_; }
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int native_buffer_size() const { return native_buffer_size_; }
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private:
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bool HasDeviceObjects();
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// Following functions assume that the calling thread has been attached.
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void SetLowLatencySupported(JNIEnv* env);
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void SetNativeOutputSampleRate(JNIEnv* env);
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void SetNativeFrameSize(JNIEnv* env);
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jmethodID LookUpMethodId(JNIEnv* env, const char* method_name,
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const char* method_signature);
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void CreateInstance(JNIEnv* env);
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// Whether or not low latency audio is supported, the native output sample
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// rate and the audio buffer size do not change. I.e the values might as well
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// just be cached when initializing.
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bool low_latency_supported_;
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int native_output_sample_rate_;
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int native_buffer_size_;
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_AUDIO_MANAGER_JNI_H_
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