Fix serial and 64bit granule pos

Author: chris-rudmin

dist-unminified/encoderWorker.js

@@ -1,6 +1,6 @@
 {
   "name": "opus-recorder",
-  "version": "4.1.1",
+  "version": "4.1.2",
   "description": "A library for recording opus encoded audio",
   "homepage": "https://github.com/chris-rudmin/opus-recorder",
   "author": "Chris Rudmin",

dist/encoderWorker.min.js

@@ -48,7 +48,7 @@ var OggOpusEncoder = function( config, Module ){
     numberOfChannels: 1,
     originalSampleRate: 44100,
     resampleQuality: 3, // Value between 0 and 10 inclusive. 10 being highest quality.
-    serial: Math.floor( Math.random() * Math.pow(2,32) )
+    serial: Math.floor( Math.random() * (Math.pow(2,32) - 1) )
   }, config );
 
   this._opus_encoder_create = Module._opus_encoder_create;
@@ -171,10 +171,14 @@ OggOpusEncoder.prototype.generatePage = function(){
   pageBufferView.setUint8( 4, 0, true ); // Version
   pageBufferView.setUint8( 5, this.headerType, true ); // 1 = continuation, 2 = beginning of stream, 4 = end of stream
 
-  // Number of samples upto and including this page at 48000Hz, into 64 bits
+  // Number of samples upto and including this page at 48000Hz, into signed 64 bit Little Endian integer
+  // Javascript Number maximum value is 53 bits or 2^53 - 1 
   pageBufferView.setUint32( 6, granulePosition, true );
-  if ( granulePosition > 4294967296 || granulePosition < 0 ) {
-    pageBufferView.setUint32( 10, Math.floor( granulePosition/4294967296 ), true );
+  if (granulePosition < 0) {
+    pageBufferView.setInt32( 10, Math.ceil(granulePosition/4294967297) - 1, true );
+  }
+  else {
+    pageBufferView.setInt32( 10, Math.floor(granulePosition/4294967296), true );
   }
 
   pageBufferView.setUint32( 14, this.config.serial, true ); // Bitstream serial number

package.json

@@ -139,4 +139,130 @@ describe('encoderWorker', function() {
     getEncoder();
   });
 
+  it('should set granule position to 0', function (done) {
+    var pageBufferCount = 0;
+
+    global.postMessage = function(page) {
+      pageBufferCount++;
+
+      if (pageBufferCount == 3) {
+        var dataView = new DataView(page.buffer);
+        expect(dataView.getUint32(6, true)).to.equal(0);
+        expect(dataView.getInt32(10, true)).to.equal(0);
+        done();
+      }
+    };
+
+    getEncoder().then(function(encoder) {
+      encoder.lastPositiveGranulePosition = 1;
+      encoder.granulePosition = 0;
+      encoder.generatePage();
+    });
+  });
+
+  it('should set granule position to -1', function (done) {
+    var pageBufferCount = 0;
+
+    global.postMessage = function(page) {
+      pageBufferCount++;
+
+      if (pageBufferCount == 3) {
+        var dataView = new DataView(page.buffer);
+        expect(dataView.getUint32(6, true)).to.equal(4294967295);
+        expect(dataView.getInt32(10, true)).to.equal(-1);
+        done();
+      }
+    };
+
+    getEncoder().then(function(encoder) {
+      encoder.lastPositiveGranulePosition = 1;
+      encoder.granulePosition = -1;
+      encoder.generatePage();
+    });
+  });
+
+  it('should set granule position to -2^32', function (done) {
+    var pageBufferCount = 0;
+
+    global.postMessage = function(page) {
+      pageBufferCount++;
+
+      if (pageBufferCount == 3) {
+        var dataView = new DataView(page.buffer);
+        expect(dataView.getUint32(6, true)).to.equal(0);
+        expect(dataView.getInt32(10, true)).to.equal(-1);
+        done();
+      }
+    };
+
+    getEncoder().then(function(encoder) {
+      encoder.lastPositiveGranulePosition = 1;
+      encoder.granulePosition = -4294967296;
+      encoder.generatePage();
+    });
+  });
+
+  it('should set granule position to -2^32 - 1', function (done) {
+    var pageBufferCount = 0;
+
+    global.postMessage = function(page) {
+      pageBufferCount++;
+
+      if (pageBufferCount == 3) {
+        var dataView = new DataView(page.buffer);
+        expect(dataView.getUint32(6, true)).to.equal(4294967295);
+        expect(dataView.getInt32(10, true)).to.equal(-2);
+        done();
+      }
+    };
+
+    getEncoder().then(function(encoder) {
+      encoder.lastPositiveGranulePosition = 1;
+      encoder.granulePosition = -4294967297;
+      encoder.generatePage();
+    });
+  });
+
+  it('should set granule position to 2^32 - 1', function (done) {
+    var pageBufferCount = 0;
+
+    global.postMessage = function(page) {
+      pageBufferCount++;
+
+      if (pageBufferCount == 3) {
+        var dataView = new DataView(page.buffer);
+        expect(dataView.getUint32(6, true)).to.equal(4294967295);
+        expect(dataView.getInt32(10, true)).to.equal(0);
+        done();
+      }
+    };
+
+    getEncoder().then(function(encoder) {
+      encoder.lastPositiveGranulePosition = 1;
+      encoder.granulePosition = 4294967295;
+      encoder.generatePage();
+    });
+  });
+
+  it('should set granule position to 2^32', function (done) {
+    var pageBufferCount = 0;
+
+    global.postMessage = function(page) {
+      pageBufferCount++;
+
+      if (pageBufferCount == 3) {
+        var dataView = new DataView(page.buffer);
+        expect(dataView.getUint32(6, true)).to.equal(0);
+        expect(dataView.getInt32(10, true)).to.equal(1);
+        done();
+      }
+    };
+
+    getEncoder().then(function(encoder) {
+      encoder.lastPositiveGranulePosition = 1;
+      encoder.granulePosition = 4294967296;
+      encoder.generatePage();
+    });
+  });
+
 });