When playing back in reverse, make sure the grain to be played takes that into account.

[sound.git] / sound.js

diff --git a/sound.js b/sound.js
index e195ca69041689b36b098d8cd066465b6c0db333..6a481c58a98d1ed0c99b781022752a6512aa0be3 100644 (file)
--- a/sound.js
+++ b/sound.js
@@ -36,7 +36,6 @@ function Sound(src) {
     this._playbackRate = 1;
     this._played = {};
     this._seekable = {};
-    this._ended = false;
     this._autoplay = true;
     this._loop = false;
     this._volume = 1;
@@ -185,7 +184,7 @@ Sound.prototype = {
 
         this.setNetworkState(this.NETWORK.IDLE);
         this.dispatchEventAsync(new CustomEvent('suspend'));
-        this.setReadyState(this.READY.FUTURE_DATA);
+        this.setReadyState(this.READY.METADATA);
 
         try {
             Sound.audioContext.decodeAudioData(
@@ -210,7 +209,7 @@ Sound.prototype = {
 
         this.setCurrentTime(0);
         this.dispatchEventAsync(new CustomEvent('durationchange'));
-        this.setReadyState(this.READY.METADATA);
+        this.setReadyState(this.READY.ENOUGH_DATA);
 
         if (this.autoplaying && this._paused && this._autoplay)
             this.play();
@@ -239,12 +238,15 @@ Sound.prototype = {
         if (this.node)
             return;
 
-        if (this._ended && this._playbackRate > 0)
-            this.setCurrentTime(0);
+        if (this.endedPlayback()) {
+            if (this._playbackRate > 0)
+                this.setCurrentTime(0);
+            else
+                this.setCurrentTime(this.duration)
+        }
 
-        if (this._paused || this._ended) {
+        if (this._paused || this.endedPlayback()) {
             this._paused = false;
-            this._ended = false;
             this.dispatchEventAsync(new CustomEvent('play'));
 
             if (this._readyState < this.READY.FUTURE_DATA)
@@ -269,8 +271,11 @@ Sound.prototype = {
         this.node.connect(this.gainNode);
         this.node.buffer = this.buffer;
         this.node.playbackRate.value = this._playbackRate;
-        this.node.start(0, this.nextStartTime);
         this.node.onended = this.onended.bind(this);
+        if (this._playbackRate < 0)
+            this.node.start(0, 0, this.nextStartTime);
+        else
+            this.node.start(0, this.nextStartTime, this.buffer.duration - this.nextStartTime);
 
         this.timeUpdateTimer = setInterval(this.sendTimeUpdate.bind(this), 250);
     },
@@ -294,7 +299,7 @@ Sound.prototype = {
         if (!this.buffer || !this.node)
             return;
 
-        this.nextStartTime = Sound.audioContext.currentTime - this.startTime;
+        this.nextStartTime = this._playbackRate * (Sound.audioContext.currentTime - this.startTime);
         this.stopInternal();
     },
 
@@ -313,18 +318,32 @@ Sound.prototype = {
 
     onended: function() {
         if (this._loop) {
+            this.nextStartTime = this._playbackRate < 0 ? this.duration : 0;
             this.stopInternal();
-            this.setCurrentTime(0);
             this.playInternal();
             return;
         }
 
-        this._ended = true;
-        this.nextStartTime = 0;
+        this.nextStartTime = this._playbackRate < 0 ? 0 : this.duration;
         this.stopInternal();
         this.dispatchEventAsync(new CustomEvent('ended'));
     },
 
+    endedPlayback: function() {
+        if (this._readyState < this.READY.METADATA)
+            return false;
+
+        if (this.currentTime >= this.duration && this._playbackRate >= 0 && !this._loop)
+            return true;
+
+        if (this.currentTime <= 0 && this._playbackRate <= 0)
+            return true;
+    },
+
+    getEnded: function() {
+        return this.endedPlayback() && this._playbackRate >= 0;
+    },
+
     addEventListener: function(eventName, handler) {
         if (!this.eventListeners[eventName])
             this.eventListeners[eventName] = [];
@@ -405,10 +424,10 @@ Sound.prototype = {
         }
 
         if (oldState >= this.READY.FUTURE_DATA && newState <= this.READY.CURRENT_DATA) {
-            if (this.autoplaying && this._paused && this._autoplay && !this._ended && !this._error) {
+            if (this.autoplaying && this._paused && this._autoplay && !this.endedPlayback() && !this._error) {
                 this.dispatchEventAsync('timeupdate');
                 this.dispatchEventAsync('waiting');
-                this.nextStartTime = Sound.audioContext.currentTime - this.startTime;
+                this.nextStartTime = this._playbackRate * (Sound.audioContext.currentTime - this.startTime);
                 this.stopInternal();
             }
         }
@@ -462,11 +481,11 @@ Sound.prototype = {
     getCurrentTime: function() {
         if (!this.node)
             return this.nextStartTime;
-        return this.nextStartTime + Sound.audioContext.currentTime - this.startTime;
+        return this.nextStartTime + this._playbackRate * (Sound.audioContext.currentTime - this.startTime);
     },
 
     setCurrentTime: function(time) {
-        this.nextStartTime = time;
+        this.nextStartTime = parseFloat(time);
         this.dispatchEventAsync(new CustomEvent('timeupdate'));
         if (!this.node)
             return;
@@ -491,14 +510,32 @@ Sound.prototype = {
     },
 
     setPlaybackRate: function(rate) {
-        this._playbackRate = rate;
+        var oldPlaybackRate = this._playbackRate;
+        this._playbackRate = parseFloat(rate);
+        this.dispatchEventAsync(new CustomEvent('ratechange'));
 
-        if (this.buffer) {
-            this.stopInternal();
-            this.playInternal();
+        if (this.node) {
+            var currentTime = Sound.audioContext.currentTime
+            this.nextStartTime += oldPlaybackRate * (currentTime - this.startTime);
+            this.startTime = currentTime;
+            this.node.playbackRate.value = this._playbackRate;
+
+            if ((oldPlaybackRate <= 0) != (this._playbackRate <= 0)) {
+                this.stopInternal();
+                this.playInternal();
+            }
         }
     },
 
+    getDefaultPlaybackRate: function() {
+        return this._defaultPlaybackRate;
+    },
+
+    setDefaultPlaybackRate: function(rate) {
+        this._defaultPlaybackRate = parseFloat(rate);
+        this.dispatchEventAsync(new CustomEvent('ratechange'));
+    },
+
     getVolume: function() {
         return this._volume;
     },
@@ -507,7 +544,7 @@ Sound.prototype = {
         if (this._volume === volume)
             return;
 
-        this._volume = volume;
+        this._volume = parseFloat(volume);
         this.dispatchEventAsync(new CustomEvent('volumechange'));
 
         if (this.gainNode)