初始化

cocos2d-x/cocos/audio/android/Track.cpp

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+/****************************************************************************
+Copyright (c) 2016 Chukong Technologies Inc.
+Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
+
+http://www.cocos2d-x.org
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+****************************************************************************/
+
+#define LOG_TAG "Track"
+
+#include "audio/android/cutils/log.h"
+#include "audio/android/Track.h"
+
+#include <math.h>
+
+namespace cocos2d { 
+
+Track::Track(const PcmData &pcmData)
+        : onStateChanged(nullptr)
+        , _pcmData(pcmData)
+        , _prevState(State::IDLE)
+        , _state(State::IDLE)
+        , _name(-1)
+        , _volume(1.0f)
+        , _isVolumeDirty(true)
+        , _isLoop(false)
+        , _isInitialized(false)
+        , _isAudioFocus(true)
+{
+    init(_pcmData.pcmBuffer->data(), _pcmData.numFrames, _pcmData.bitsPerSample / 8 * _pcmData.numChannels);
+}
+
+Track::~Track()
+{
+    ALOGV("~Track(): %p", this);
+}
+
+gain_minifloat_packed_t Track::getVolumeLR()
+{
+    float volume = _isAudioFocus ? _volume : 0.0f;
+    gain_minifloat_t v = gain_from_float(volume);
+    return gain_minifloat_pack(v, v);
+}
+
+bool Track::setPosition(float pos)
+{
+    _nextFrame = (size_t) (pos * _numFrames / _pcmData.duration);
+    _unrel = 0;
+    return true;
+}
+
+float Track::getPosition() const
+{
+    return _nextFrame * _pcmData.duration / _numFrames;
+}
+
+void Track::setVolume(float volume)
+{
+    std::lock_guard<std::mutex> lk(_volumeDirtyMutex);
+    if (fabs(_volume - volume) > 0.00001)
+    {
+        _volume = volume;
+        setVolumeDirty(true);
+    }
+}
+
+float Track::getVolume() const
+{
+    return _volume;
+}
+
+void Track::setAudioFocus(bool isFocus)
+{
+    _isAudioFocus = isFocus;
+    setVolumeDirty(true);
+}
+
+void Track::setState(State state)
+{
+    std::lock_guard<std::mutex> lk(_stateMutex);
+    if (_state != state)
+    {
+        _prevState = _state;
+        _state = state;
+        onStateChanged(_state);
+    }
+};
+
+} // namespace cocos2d {