| /* |
| * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #ifndef SDK_ANDROID_SRC_JNI_AUDIO_DEVICE_AUDIO_TRACK_JNI_H_ |
| #define SDK_ANDROID_SRC_JNI_AUDIO_DEVICE_AUDIO_TRACK_JNI_H_ |
| |
| #include <jni.h> |
| #include <memory> |
| |
| #include "absl/types/optional.h" |
| #include "modules/audio_device/audio_device_buffer.h" |
| #include "modules/audio_device/include/audio_device_defines.h" |
| #include "rtc_base/thread_checker.h" |
| #include "sdk/android/src/jni/audio_device/audio_common.h" |
| #include "sdk/android/src/jni/audio_device/audio_device_module.h" |
| |
| namespace webrtc { |
| |
| namespace jni { |
| |
| // Implements 16-bit mono PCM audio output support for Android using the Java |
| // AudioTrack interface. Most of the work is done by its Java counterpart in |
| // WebRtcAudioTrack.java. This class is created and lives on a thread in |
| // C++-land, but decoded audio buffers are requested on a high-priority |
| // thread managed by the Java class. |
| // |
| // An instance can be created on any thread, but must then be used on one and |
| // the same thread. All public methods must also be called on the same thread. A |
| // thread checker will RTC_DCHECK if any method is called on an invalid thread |
| // |
| // This class uses AttachCurrentThreadIfNeeded to attach to a Java VM if needed. |
| // Additional thread checking guarantees that no other (possibly non attached) |
| // thread is used. |
| class AudioTrackJni : public AudioOutput { |
| public: |
| static ScopedJavaLocalRef<jobject> CreateJavaWebRtcAudioTrack( |
| JNIEnv* env, |
| const JavaRef<jobject>& j_context, |
| const JavaRef<jobject>& j_audio_manager); |
| |
| AudioTrackJni(JNIEnv* env, |
| const AudioParameters& audio_parameters, |
| const JavaRef<jobject>& j_webrtc_audio_track); |
| ~AudioTrackJni() override; |
| |
| int32_t Init() override; |
| int32_t Terminate() override; |
| |
| int32_t InitPlayout() override; |
| bool PlayoutIsInitialized() const override; |
| |
| int32_t StartPlayout() override; |
| int32_t StopPlayout() override; |
| bool Playing() const override; |
| |
| bool SpeakerVolumeIsAvailable() override; |
| int SetSpeakerVolume(uint32_t volume) override; |
| absl::optional<uint32_t> SpeakerVolume() const override; |
| absl::optional<uint32_t> MaxSpeakerVolume() const override; |
| absl::optional<uint32_t> MinSpeakerVolume() const override; |
| |
| void AttachAudioBuffer(AudioDeviceBuffer* audioBuffer) override; |
| |
| // Called from Java side so we can cache the address of the Java-manged |
| // |byte_buffer| in |direct_buffer_address_|. The size of the buffer |
| // is also stored in |direct_buffer_capacity_in_bytes_|. |
| // Called on the same thread as the creating thread. |
| void CacheDirectBufferAddress(JNIEnv* env, |
| const JavaParamRef<jobject>& j_caller, |
| const JavaParamRef<jobject>& byte_buffer); |
| // Called periodically by the Java based WebRtcAudioTrack object when |
| // playout has started. Each call indicates that |length| new bytes should |
| // be written to the memory area |direct_buffer_address_| for playout. |
| // This method is called on a high-priority thread from Java. The name of |
| // the thread is 'AudioTrackThread'. |
| void GetPlayoutData(JNIEnv* env, |
| const JavaParamRef<jobject>& j_caller, |
| size_t length); |
| |
| private: |
| // Stores thread ID in constructor. |
| rtc::ThreadChecker thread_checker_; |
| |
| // Stores thread ID in first call to OnGetPlayoutData() from high-priority |
| // thread in Java. Detached during construction of this object. |
| rtc::ThreadChecker thread_checker_java_; |
| |
| // Wraps the Java specific parts of the AudioTrackJni class. |
| JNIEnv* env_ = nullptr; |
| ScopedJavaGlobalRef<jobject> j_audio_track_; |
| |
| // Contains audio parameters provided to this class at construction by the |
| // AudioManager. |
| const AudioParameters audio_parameters_; |
| |
| // Cached copy of address to direct audio buffer owned by |j_audio_track_|. |
| void* direct_buffer_address_; |
| |
| // Number of bytes in the direct audio buffer owned by |j_audio_track_|. |
| size_t direct_buffer_capacity_in_bytes_; |
| |
| // Number of audio frames per audio buffer. Each audio frame corresponds to |
| // one sample of PCM mono data at 16 bits per sample. Hence, each audio |
| // frame contains 2 bytes (given that the Java layer only supports mono). |
| // Example: 480 for 48000 Hz or 441 for 44100 Hz. |
| size_t frames_per_buffer_; |
| |
| bool initialized_; |
| |
| bool playing_; |
| |
| // Raw pointer handle provided to us in AttachAudioBuffer(). Owned by the |
| // AudioDeviceModuleImpl class and called by AudioDeviceModule::Create(). |
| // The AudioDeviceBuffer is a member of the AudioDeviceModuleImpl instance |
| // and therefore outlives this object. |
| AudioDeviceBuffer* audio_device_buffer_; |
| }; |
| |
| } // namespace jni |
| |
| } // namespace webrtc |
| |
| #endif // SDK_ANDROID_SRC_JNI_AUDIO_DEVICE_AUDIO_TRACK_JNI_H_ |