From bd4d16768440b2c636f48bfca9344078dd6c15af Mon Sep 17 00:00:00 2001
From: David Rowe <david@ctrlaltstudio.com>
Date: Thu, 29 May 2014 14:13:02 -0700
Subject: [PATCH] Make JavaScript audio samples able to be looped

Add a "loop" property to AudioInjectorOptions and provide an example JavaScript file.
---
 examples/playSoundLoop.js                    | 43 ++++++++++++++++++++
 libraries/audio/src/AudioInjector.cpp        |  5 +++
 libraries/audio/src/AudioInjectorOptions.cpp |  2 +
 libraries/audio/src/AudioInjectorOptions.h   |  5 +++
 4 files changed, 55 insertions(+)
 create mode 100644 examples/playSoundLoop.js

diff --git a/examples/playSoundLoop.js b/examples/playSoundLoop.js
new file mode 100644
index 0000000000..86226468bc
--- /dev/null
+++ b/examples/playSoundLoop.js
@@ -0,0 +1,43 @@
+//
+//  playSoundLoop.js
+//  examples
+//
+//  Created by David Rowe on 5/29/14.
+//  Copyright 2014 High Fidelity, Inc.
+//
+//  This example script plays a sound in a continuous loop.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+var sound = new Sound("https://s3-us-west-1.amazonaws.com/highfidelity-public/sounds/Guitars/Guitar+-+Nylon+A.raw");
+
+var soundPlaying = false;
+
+function keyPressEvent(event) {
+    if (event.text === "1") {
+        if (!Audio.isInjectorPlaying(soundPlaying)) {
+            var options = new AudioInjectionOptions();
+            options.position = MyAvatar.position;
+            options.volume = 0.5;
+            options.loop = true;
+            soundPlaying = Audio.playSound(sound, options);
+            print("Started sound loop");
+        } else {
+            Audio.stopInjector(soundPlaying);
+            print("Stopped sound loop");
+        }
+    }
+}
+
+function scriptEnding() {
+    if (Audio.isInjectorPlaying(soundPlaying)) {
+        Audio.stopInjector(soundPlaying);
+        print("Stopped sound loop");
+    }
+}
+
+// Connect a call back that happens every frame
+Script.scriptEnding.connect(scriptEnding);
+Controller.keyPressEvent.connect(keyPressEvent);
diff --git a/libraries/audio/src/AudioInjector.cpp b/libraries/audio/src/AudioInjector.cpp
index 1fe9f1336f..129dc47bd0 100644
--- a/libraries/audio/src/AudioInjector.cpp
+++ b/libraries/audio/src/AudioInjector.cpp
@@ -88,6 +88,7 @@ void AudioInjector::injectAudio() {
         int currentSendPosition = 0;
         
         int numPreAudioDataBytes = injectAudioPacket.size();
+        bool shouldLoop = _options.getLoop();
         
         // loop to send off our audio in NETWORK_BUFFER_LENGTH_SAMPLES_PER_CHANNEL byte chunks
         while (currentSendPosition < soundByteArray.size() && !_shouldStop) {
@@ -120,6 +121,10 @@ void AudioInjector::injectAudio() {
                     usleep(usecToSleep);
                 }
             }
+
+            if (shouldLoop && currentSendPosition == soundByteArray.size()) {
+                currentSendPosition = 0;
+            }
         }
     }
     
diff --git a/libraries/audio/src/AudioInjectorOptions.cpp b/libraries/audio/src/AudioInjectorOptions.cpp
index cd6b08f6c7..49f1571c98 100644
--- a/libraries/audio/src/AudioInjectorOptions.cpp
+++ b/libraries/audio/src/AudioInjectorOptions.cpp
@@ -15,6 +15,7 @@ AudioInjectorOptions::AudioInjectorOptions(QObject* parent) :
     QObject(parent),
     _position(0.0f, 0.0f, 0.0f),
     _volume(1.0f),
+    _loop(false),
     _orientation(glm::vec3(0.0f, 0.0f, 0.0f)),
     _loopbackAudioInterface(NULL)
 {
@@ -24,6 +25,7 @@ AudioInjectorOptions::AudioInjectorOptions(QObject* parent) :
 AudioInjectorOptions::AudioInjectorOptions(const AudioInjectorOptions& other) {
     _position = other._position;
     _volume = other._volume;
+    _loop = other._loop;
     _orientation = other._orientation;
     _loopbackAudioInterface = other._loopbackAudioInterface;
 }
diff --git a/libraries/audio/src/AudioInjectorOptions.h b/libraries/audio/src/AudioInjectorOptions.h
index bbe3d57b08..b90deb93f1 100644
--- a/libraries/audio/src/AudioInjectorOptions.h
+++ b/libraries/audio/src/AudioInjectorOptions.h
@@ -26,6 +26,7 @@ class AudioInjectorOptions : public QObject {
     
     Q_PROPERTY(glm::vec3 position READ getPosition WRITE setPosition)
     Q_PROPERTY(float volume READ getVolume WRITE setVolume)
+    Q_PROPERTY(bool loop READ getLoop WRITE setLoop)
 public:
     AudioInjectorOptions(QObject* parent = 0);
     AudioInjectorOptions(const AudioInjectorOptions& other);
@@ -36,6 +37,9 @@ public:
     float getVolume() const { return _volume; }
     void setVolume(float volume) { _volume = volume; }
     
+    float getLoop() const { return _loop; }
+    void setLoop(float loop) { _loop = loop; }
+
     const glm::quat& getOrientation() const { return _orientation; }
     void setOrientation(const glm::quat& orientation) { _orientation = orientation; }
     
@@ -45,6 +49,7 @@ public:
 private:
     glm::vec3 _position;
     float _volume;
+    bool _loop;
     glm::quat _orientation;
     AbstractAudioInterface* _loopbackAudioInterface;
 };