[adapters] 增加小游戏适配部分源码

adapters/common/engine/Audio.js

@@ -0,0 +1,69 @@
+const Audio = cc._Audio;
+
+if (Audio) {
+    let originGetDuration = Audio.prototype.getDuration;
+    Object.assign(Audio.prototype, {
+        _createElement () {
+            let elem = this._src._nativeAsset;
+            // Reuse dom audio element
+            if (!this._element) {
+                this._element = __globalAdapter.createInnerAudioContext();
+            }
+            this._element.src = elem.src;
+        },
+
+        destroy () {
+            if (this._element) {
+                this._element.destroy();
+                this._element = null;
+            }
+        },
+
+        setCurrentTime (num) {
+            let self = this;
+            this._src && this._src._ensureLoaded(function () {
+                self._element.seek(num);
+            });
+        },
+
+        stop () {
+            let self = this;
+            this._src && this._src._ensureLoaded(function () {
+                // HACK: some platforms won't set currentTime to 0 when stop audio
+                self._element.seek(0);
+                self._element.stop();
+                self._unbindEnded();
+                self.emit('stop');
+                self._state = Audio.State.STOPPED;
+            });
+        },
+
+        _bindEnded () {
+            let elem = this._element;
+            if (elem && elem.onEnded && !this._onended._binded) {
+              this._onended._binded = true;
+              elem.onEnded(this._onended);
+            }
+        },
+
+        _unbindEnded () {
+            let elem = this._element;
+            if (elem && elem.offEnded && this._onended._binded) {
+              this._onended._binded = false;
+              elem.offEnded && elem.offEnded(this._onended);
+            }
+        },
+
+        getDuration () {
+            let duration = originGetDuration.call(this);
+            // HACK: in mini game, if dynamicly load audio, can't get duration from audioClip
+            // because duration is not coming from audio deserialization
+            duration = duration || (this._element ? this._element.duration : 0);
+            return duration;
+        },
+
+        // adapt some special operations on web platform
+        _touchToPlay () { },
+        _forceUpdatingState () { },
+    });
+}