fix: 修复在长时间暂停后无法播放的问题 (#1627)

* fix: 修复在长时间暂停后无法播放的问题

* 增加doc

src/utils/Player.js

@@ -14,6 +14,15 @@ import { decode as base642Buffer } from '@/utils/base64';
 
 const PLAY_PAUSE_FADE_DURATION = 200;
 
+/**
+ * @readonly
+ * @enum {string}
+ */
+const UNPLAYABLE_CONDITION = {
+  PLAY_NEXT_TRACK: 'playNextTrack',
+  PLAY_PREV_TRACK: 'playPrevTrack',
+};
+
 const electron =
   process.env.IS_ELECTRON === true ? window.require('electron') : null;
 const ipcRenderer =
@@ -164,6 +173,9 @@ export default class {
   get currentTrack() {
     return this._currentTrack;
   }
+  get currentTrackID() {
+    return this._currentTrack?.id ?? 0;
+  }
   get playlistSource() {
     return this._playlistSource;
   }
@@ -199,7 +211,7 @@ export default class {
 
     if (this._enabled) {
       // 恢复当前播放歌曲
-      this._replaceCurrentTrack(this._currentTrack.id, false).then(() => {
+      this._replaceCurrentTrack(this.currentTrackID, false).then(() => {
         this._howler?.seek(localStorage.getItem('playerCurrentTrackTime') ?? 0);
       }); // update audio source and init howler
       this._initMediaSession();
@@ -278,7 +290,7 @@ export default class {
     // 返回 [trackID, index]
     return [this.list[next], next];
   }
-  async _shuffleTheList(firstTrackID = this._currentTrack.id) {
+  async _shuffleTheList(firstTrackID = this.currentTrackID) {
     let list = this._list.filter(tid => tid !== firstTrackID);
     if (firstTrackID === 'first') list = this._list;
     this._shuffledList = shuffle(list);
@@ -321,6 +333,25 @@ export default class {
         this._nextTrackCallback();
       },
     });
+    this._howler.on('loaderror', (_, errCode) => {
+      // https://developer.mozilla.org/en-US/docs/Web/API/MediaError/code
+      // code 3: MEDIA_ERR_DECODE
+      if (errCode === 3) {
+        this._playNextTrack(this._isPersonalFM);
+      } else {
+        const t = this.progress;
+        this._replaceCurrentTrackAudio(this.currentTrack, false, false).then(
+          replaced => {
+            // 如果 replaced 为 false，代表当前的 track 已经不是这里想要替换的track
+            // 此时则不修改当前的歌曲进度
+            if (replaced) {
+              this._howler?.seek(t);
+              this.play();
+            }
+          }
+        );
+      }
+    });
     if (autoplay) {
       this.play();
       if (this._currentTrack.name) {
@@ -452,33 +483,61 @@ export default class {
   _replaceCurrentTrack(
     id,
     autoplay = true,
-    ifUnplayableThen = 'playNextTrack'
+    ifUnplayableThen = UNPLAYABLE_CONDITION.PLAY_NEXT_TRACK
   ) {
     if (autoplay && this._currentTrack.name) {
       this._scrobble(this.currentTrack, this._howler?.seek());
     }
     return getTrackDetail(id).then(data => {
-      let track = data.songs[0];
+      const track = data.songs[0];
       this._currentTrack = track;
       this._updateMediaSessionMetaData(track);
-      return this._getAudioSource(track).then(source => {
-        if (source) {
+      return this._replaceCurrentTrackAudio(
+        track,
+        autoplay,
+        true,
+        ifUnplayableThen
+      );
+    });
+  }
+  /**
+   * @returns 是否成功加载音频，并使用加载完成的音频替换了howler实例
+   */
+  _replaceCurrentTrackAudio(
+    track,
+    autoplay,
+    isCacheNextTrack,
+    ifUnplayableThen = UNPLAYABLE_CONDITION.PLAY_NEXT_TRACK
+  ) {
+    return this._getAudioSource(track).then(source => {
+      if (source) {
+        let replaced = false;
+        if (track.id === this.currentTrackID) {
           this._playAudioSource(source, autoplay);
+          replaced = true;
+        }
+        if (isCacheNextTrack) {
           this._cacheNextTrack();
-          return source;
-        } else {
-          store.dispatch('showToast', `无法播放 ${track.name}`);
-          if (ifUnplayableThen === 'playNextTrack') {
-            if (this.isPersonalFM) {
-              this.playNextFMTrack();
-            } else {
-              this.playNextTrack();
-            }
-          } else {
+        }
+        return replaced;
+      } else {
+        store.dispatch('showToast', `无法播放 ${track.name}`);
+        switch (ifUnplayableThen) {
+          case UNPLAYABLE_CONDITION.PLAY_NEXT_TRACK:
+            this._playNextTrack(this.isPersonalFM);
+            break;
+          case UNPLAYABLE_CONDITION.PLAY_PREV_TRACK:
             this.playPrevTrack();
-          }
+            break;
+          default:
+            store.dispatch(
+              'showToast',
+              `undefined Unplayable condition: ${ifUnplayableThen}`
+            );
+            break;
         }
-      });
+        return false;
+      }
     });
   }
   _cacheNextTrack() {
@@ -511,11 +570,7 @@ export default class {
         this.playPrevTrack();
       });
       navigator.mediaSession.setActionHandler('nexttrack', () => {
-        if (this.isPersonalFM) {
-          this.playNextFMTrack();
-        } else {
-          this.playNextTrack();
-        }
+        this._playNextTrack(this.isPersonalFM);
       });
       navigator.mediaSession.setActionHandler('stop', () => {
         this.pause();
@@ -579,11 +634,9 @@ export default class {
   _nextTrackCallback() {
     this._scrobble(this._currentTrack, 0, true);
     if (!this.isPersonalFM && this.repeatMode === 'one') {
-      this._replaceCurrentTrack(this._currentTrack.id);
-    } else if (this.isPersonalFM) {
-      this.playNextFMTrack();
+      this._replaceCurrentTrack(this.currentTrackID);
     } else {
-      this.playNextTrack();
+      this._playNextTrack(this.isPersonalFM);
     }
   }
   _loadPersonalFMNextTrack() {
@@ -628,11 +681,14 @@ export default class {
     }
     ipcRenderer?.send('pauseDiscordPresence', track);
   }
-
-  currentTrackID() {
-    const { list, current } = this._getListAndCurrent();
-    return list[current];
+  _playNextTrack(isPersonal) {
+    if (isPersonal) {
+      this.playNextFMTrack();
+    } else {
+      this.playNextTrack();
+    }
   }
+
   appendTrack(trackID) {
     this.list.append(trackID);
   }
@@ -697,7 +753,11 @@ export default class {
     const [trackID, index] = this._getPrevTrack();
     if (trackID === undefined) return false;
     this.current = index;
-    this._replaceCurrentTrack(trackID, true, 'playPrevTrack');
+    this._replaceCurrentTrack(
+      trackID,
+      true,
+      UNPLAYABLE_CONDITION.PLAY_PREV_TRACK
+    );
     return true;
   }
   saveSelfToLocalStorage() {
@@ -838,20 +898,14 @@ export default class {
   addTrackToPlayNext(trackID, playNow = false) {
     this._playNextList.push(trackID);
     if (playNow) {
-      if (this.isPersonalFM) {
-        this.playNextFMTrack();
-      } else {
-        this.playNextTrack();
-      }
+      this.playNextTrack();
     }
   }
   playPersonalFM() {
     this._isPersonalFM = true;
     if (!this._enabled) this._enabled = true;
-    if (this._currentTrack.id !== this._personalFMTrack.id) {
-      this._replaceCurrentTrack(this._personalFMTrack.id).then(() =>
-        this.playOrPause()
-      );
+    if (this.currentTrackID !== this._personalFMTrack.id) {
+      this._replaceCurrentTrack(this._personalFMTrack.id, true);
     } else {
       this.playOrPause();
     }