From 4c90ba4d6464916edb4a98f88ddf461e02553de6 Mon Sep 17 00:00:00 2001
From: Lukasz Foniok <l.foniok@samsung.com>
Date: Mon, 9 Nov 2015 16:33:50 +0100
Subject: [PATCH] [Media] startRecord, stopRecord implementation

Change-Id: I552481d5e5cf91c8af9babadb30684f12605d3ec
Signed-off-by: Lukasz Foniok <l.foniok@samsung.com>
---
 src/media/cordova_media_api.js | 239 +++++++++++++++++++++++++++++----
 1 file changed, 216 insertions(+), 23 deletions(-)

diff --git a/src/media/cordova_media_api.js b/src/media/cordova_media_api.js
index 0f42cc4..199e17a 100755
--- a/src/media/cordova_media_api.js
+++ b/src/media/cordova_media_api.js
@@ -20,18 +20,205 @@ var plugin_name = 'cordova-plugin-media.tizen.Media';
 cordova.define(plugin_name, function(require, exports, module) {
 // TODO: remove -> end
 
-  var audioObjects = {};
+    var audioObjects = {};
+    var recorder = null;
+
+    function Recorder(_filename) {
+        var recorder = null;
+        var recording = false;
+        var recordingLength = 0;
+        var volume = null;
+        var audioInput = null;
+        var sampleRate = null;
+        var filename = _filename;
+
+        // creates the audio context
+        var audioContext = window.AudioContext || window.webkitAudioContext;
+        var context = new audioContext();
+
+        var audioBlob = null;
+
+        this.rec = function(){
+
+            if (!navigator.getUserMedia)
+                navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia ||
+                    navigator.mozGetUserMedia || navigator.msGetUserMedia;
+
+            if (navigator.getUserMedia){
+                navigator.getUserMedia({audio:true}, onGetUserMedia, function(e) {
+                    console.log('Error capturing audio.');
+                });
+            } else {
+                console.log('getUserMedia not supported in this browser.');
+            }
+        }
+
+        this.stop = function (){
+            recording = false;
+            audioBlob.stop();
+            recorder.disconnect();
+
+            // flat the left and right channels down
+            var leftBuffer = mergeBuffers(leftchannel, recordingLength);
+            var rightBuffer = mergeBuffers(rightchannel, recordingLength);
+            // interleave both channels together
+            var interleaved = interleave(leftBuffer, rightBuffer);
+
+            // create the buffer and view to create the .WAV file
+            var buffer = new ArrayBuffer(44 + interleaved.length * 2);
+            var view = new DataView(buffer);
+
+            // write the WAV container
+            // RIFF chunk descriptor
+            writeUTFBytes(view, 0, 'RIFF');
+            view.setUint32(4, 44 + interleaved.length * 2, true);
+            writeUTFBytes(view, 8, 'WAVE');
+            // FMT sub-chunk
+            writeUTFBytes(view, 12, 'fmt ');
+            view.setUint32(16, 16, true);
+            view.setUint16(20, 1, true);
+            // stereo (2 channels)
+            view.setUint16(22, 2, true);
+            view.setUint32(24, sampleRate, true);
+            view.setUint32(28, sampleRate * 4, true);
+            view.setUint16(32, 4, true);
+            view.setUint16(34, 16, true);
+            // data sub-chunk
+            writeUTFBytes(view, 36, 'data');
+            view.setUint32(40, interleaved.length * 2, true);
+
+            // write the PCM samples
+            var lng = interleaved.length;
+            var index = 44;
+            var volume = 1;
+            for (var i = 0; i < lng; i++){
+                view.setInt16(index, interleaved[i] * (0x7FFF * volume), true);
+                index += 2;
+            }
+
+            handleReadBlob(buffer);
+        }
+
+        function onGetUserMedia(stream){
+            recording = true;
+            var leftchannel = [];
+            var rightchannel = [];
+            recordingLength = 0;
+
+            audioBlob = stream;
+
+            // retrieve the current sample rate to be used for WAV packaging
+            sampleRate = context.sampleRate;
+
+            // creates a gain node
+            volume = context.createGain();
+
+            // creates an audio node from the microphone incoming stream
+            audioInput = context.createMediaStreamSource(stream);
+
+            // connect the stream to the gain node
+            audioInput.connect(volume);
+
+            /* From the spec: This value controls how frequently the audioprocess event is
+             dispatched and how many sample-frames need to be processed each call.
+             Lower values for buffer size will result in a lower (better) latency.
+             Higher values will be necessary to avoid audio breakup and glitches */
+            var bufferSize = 2048;
+            recorder = context.createJavaScriptNode(bufferSize, 2, 2);
+
+            recorder.onaudioprocess = function(sample){
+                if(!recording) {
+                    return;
+                }
+                var left = sample.inputBuffer.getChannelData(0);
+                var right = sample.inputBuffer.getChannelData(1);
+                // clone the samples
+                leftchannel.push(new Float32Array(left));
+                rightchannel.push(new Float32Array(right));
+                recordingLength += bufferSize;
+            }
+
+            //  connect the recorder
+            volume.connect (recorder);
+            recorder.connect (context.destination);
+        }
+
+        function handleReadBlob(buffer) {
+            var array = new Uint8Array(buffer);
+            var arr = [];
+            for (var i=0; i<array.length; i++){
+                arr[i] = array[i];
+            }
+
+            function onsuccess(dir) {
+                var recFile = dir.createFile(filename);
+                if (recFile != null) {
+                    recFile.openStream('w', function (fs) {
+                        fs.writeBytes(arr);
+                        fs.close();
+                    }, function (error) {
+                        console.log('Error ' + error.message);
+                    }, 'UTF-8');
+                }
+            }
+
+            function onerror(error) {
+                console.log('The error ' + error + ' occurred when resolving documents folder');
+            }
+
+            try {
+                tizen.filesystem.resolve('documents', onsuccess, onerror, 'rw');
+            }
+            catch(error) {
+                console.log('Caught error ' + error);
+            }
+        }
+
+        function mergeBuffers(channelBuffer, recordingLength){
+            var result = new Float32Array(recordingLength);
+            var offset = 0;
+            var lng = channelBuffer.length;
+            for (var i = 0; i < lng; i++){
+                var buffer = channelBuffer[i];
+                result.set(buffer, offset);
+                offset += buffer.length;
+            }
+            return result;
+        }
+
+        function interleave(leftChannel, rightChannel){
+            var length = leftChannel.length + rightChannel.length;
+            var result = new Float32Array(length);
+
+            var inputIndex = 0;
+
+            for (var index = 0; index < length;){
+                result[index++] = leftChannel[inputIndex];
+                result[index++] = rightChannel[inputIndex];
+                inputIndex++;
+            }
+            return result;
+        }
+
+        function writeUTFBytes(view, offset, string){
+            var lng = string.length;
+            for (var i = 0; i < lng; i++){
+                view.setUint8(offset + i, string.charCodeAt(i));
+            }
+        }
+    }
 
   exports = {
   create: function(successCallback, errorCallback, args) {
     var id = args[0], src = args[1];
 
-    console.log("media::create() - id =" + id + ", src =" + src);
+    console.log('media::create() - id =' + id + ', src =' + src);
 
+    recorder = new Recorder(src);
     audioObjects[id] = new Audio(src);
 
     audioObjects[id].onStalledCB = function () {
-      console.log("media::onStalled()");
+      console.log('media::onStalled()');
 
       audioObjects[id].timer = setTimeout(
         function () {
@@ -40,52 +227,52 @@ cordova.define(plugin_name, function(require, exports, module) {
           if (audioObjects[id].currentTime !== 0)
             audioObjects[id].currentTime = 0;
 
-          console.log("media::onStalled() - MEDIA_ERROR -> " + MediaError.MEDIA_ERR_ABORTED);
+          console.log('media::onStalled() - MEDIA_ERROR -> ' + MediaError.MEDIA_ERR_ABORTED);
 
-          var err = new MediaError(MediaError.MEDIA_ERR_ABORTED, "Stalled");
+          var err = new MediaError(MediaError.MEDIA_ERR_ABORTED, 'Stalled');
 
           Media.onStatus(id, Media.MEDIA_ERROR, err);
       }, 2000);
     };
 
     audioObjects[id].onEndedCB = function () {
-        console.log("media::onEndedCB() - MEDIA_STATE -> MEDIA_STOPPED");
+        console.log('media::onEndedCB() - MEDIA_STATE -> MEDIA_STOPPED');
 
         Media.onStatus(id, Media.MEDIA_STATE, Media.MEDIA_STOPPED);
     };
 
     audioObjects[id].onErrorCB = function (event) {
-        console.log("media::onErrorCB() - MEDIA_ERROR -> " + event.srcElement.error);
+        console.log('media::onErrorCB() - MEDIA_ERROR -> ' + event.srcElement.error);
 
         Media.onStatus(id, Media.MEDIA_ERROR, event.srcElement.error);
     };
 
     audioObjects[id].onPlayCB = function () {
-        console.log("media::onPlayCB() - MEDIA_STATE -> MEDIA_STARTING");
+        console.log('media::onPlayCB() - MEDIA_STATE -> MEDIA_STARTING');
 
         Media.onStatus(id, Media.MEDIA_STATE, Media.MEDIA_STARTING);
     };
 
     audioObjects[id].onPlayingCB = function () {
-        console.log("media::onPlayingCB() - MEDIA_STATE -> MEDIA_RUNNING");
+        console.log('media::onPlayingCB() - MEDIA_STATE -> MEDIA_RUNNING');
 
         Media.onStatus(id, Media.MEDIA_STATE, Media.MEDIA_RUNNING);
     };
 
     audioObjects[id].onDurationChangeCB = function () {
-        console.log("media::onDurationChangeCB() - MEDIA_DURATION -> " +  audioObjects[id].duration);
+        console.log('media::onDurationChangeCB() - MEDIA_DURATION -> ' +  audioObjects[id].duration);
 
         Media.onStatus(id, Media.MEDIA_DURATION, audioObjects[id].duration);
     };
 
     audioObjects[id].onTimeUpdateCB = function () {
-        console.log("media::onTimeUpdateCB() - MEDIA_POSITION -> " +  audioObjects[id].currentTime);
+        console.log('media::onTimeUpdateCB() - MEDIA_POSITION -> ' +  audioObjects[id].currentTime);
 
         Media.onStatus(id, Media.MEDIA_POSITION, audioObjects[id].currentTime);
     };
 
     audioObjects[id].onCanPlayCB = function () {
-        console.log("media::onCanPlayCB()");
+        console.log('media::onCanPlayCB()');
 
         window.clearTimeout(audioObjects[id].timer);
 
@@ -95,7 +282,7 @@ cordova.define(plugin_name, function(require, exports, module) {
   startPlayingAudio: function(successCallback, errorCallback, args) {
     var id = args[0], src = args[1];
 
-    console.log("media::startPlayingAudio() - id =" + id + ", src =" + src);
+    console.log('media::startPlayingAudio() - id =' + id + ', src =' + src);
 
     audioObjects[id].addEventListener('canplay', audioObjects[id].onCanPlayCB);
     audioObjects[id].addEventListener('ended', audioObjects[id].onEndedCB);
@@ -118,7 +305,7 @@ cordova.define(plugin_name, function(require, exports, module) {
       if (audioObjects[id].currentTime !== 0)
           audioObjects[id].currentTime = 0;
 
-      console.log("media::stopPlayingAudio() - MEDIA_STATE -> MEDIA_STOPPED");
+      console.log('media::stopPlayingAudio() - MEDIA_STATE -> MEDIA_STOPPED');
 
       audioObjects[id].removeEventListener('canplay', audioObjects[id].onCanPlayCB);
       audioObjects[id].removeEventListener('ended', audioObjects[id].onEndedCB);
@@ -134,15 +321,15 @@ cordova.define(plugin_name, function(require, exports, module) {
   seekToAudio: function(successCallback, errorCallback, args) {
       var id = args[0], milliseconds = args[1];
 
-      console.log("media::seekToAudio()");
+      console.log('media::seekToAudio()');
 
       audioObjects[id].currentTime = milliseconds;
-      successCallback( audioObjects[id].currentTime);
+      successCallback(audioObjects[id].currentTime);
   },
   pausePlayingAudio: function(successCallback, errorCallback, args) {
       var id = args[0];
 
-      console.log("media::pausePlayingAudio() - MEDIA_STATE -> MEDIA_PAUSED");
+      console.log('media::pausePlayingAudio() - MEDIA_STATE -> MEDIA_PAUSED');
 
       audioObjects[id].pause();
 
@@ -150,26 +337,32 @@ cordova.define(plugin_name, function(require, exports, module) {
   },
   getCurrentPositionAudio: function(successCallback, errorCallback, args) {
       var id = args[0];
-      console.log("media::getCurrentPositionAudio()");
+      console.log('media::getCurrentPositionAudio()');
       successCallback(audioObjects[id].currentTime);
   },
-  startRecordingAudio: function(successCallback, errorCallback, args) {},
-  stopRecordingAudio: function(successCallback, errorCallback, args) {},
+  startRecordingAudio: function(successCallback, errorCallback, args) {
+      console.log('media::startRecordingAudio()');
+      recorder.rec();
+  },
+  stopRecordingAudio: function(successCallback, errorCallback, args) {
+      console.log('media::stopRecordingAudio()');
+      recorder.stop();
+  },
   release: function(successCallback, errorCallback, args) {
       exports.stopPlayingAudio(successCallback, errorCallback, args);
       var id = args[0];
       delete audioObjects[id];
-      console.log("media::release()");
+      console.log('media::release()');
   },
   setVolume: function(successCallback, errorCallback, args) {
       var id = args[0], volume = args[1];
 
-      console.log("media::setVolume()");
+      console.log('media::setVolume()');
 
       audioObjects[id].volume = volume;
   }
 };
-require("cordova/exec/proxy").add("Media", exports);
+require('cordova/exec/proxy').add('Media', exports);
 
 console.log('Loaded cordova.media API');
 
-- 
2.34.1