laser500-wav - npm Package Compare versions

Comparing version 0.0.1 to 0.1.0

laser500wav.js

@@ -17,2 +17,5 @@ #!/usr/bin/env node
    { name: 'samplerate', alias: 's', type: Number },
+   { name: 'volume', alias: 'v', type: Number },
+   { name: 'stereoboost', type: Boolean },
+   { name: 'invert', type: Boolean },
    { name: 'turbo', alias: 'x', type: Boolean },   
@@ -39,2 +42,5 @@ { name: 'turbo-address', type: Number },
    console.log("  -s or --samplerate rate     the samplerate of the WAV file (96000 default)");
+   console.log("  -v or --volume number       volume between 0 and 1 (1.0 default)");
+   console.log("  --stereoboost               boost volume for stereo cables by inverting the RIGHT channel");
+   console.log("  --invert                    inverts the polarity of the audio");
    console.log("  -x or --turbo               generates a turbo tape loadable file");
@@ -50,2 +56,3 @@ console.log("  --turbo-address hexaddress  address in memory of the turbo tape file (0x8995 default)");
 const SAMPLE_RATE = options.samplerate || 96000;
+const VOLUME = options.volume || 1.0;
 
@@ -102,5 +109,11 @@ console.log(`sample rate is ${SAMPLE_RATE} Hz`);
 
+// invert audio samples if --invert option was given
+if(options.invert) samples = invertSamples(samples);
+
+samples = new Float32Array(samples);
+const samples_inv = new Float32Array(invertSamples(samples));
+
 const wavData = {
   sampleRate: SAMPLE_RATE,
-  channelData: [ new Float32Array(samples) ]
+  channelData: !options.stereoboost ? [ samples ] : [ samples, samples_inv ]
 };
@@ -129,2 +142,7 @@
 
+function invertSamples(samples)
+{
+   return samples.map(e=>-e);
+}
+
 function tapeStructure(tapeName, fileType, startAddress, program) {   
@@ -220,11 +238,11 @@ const bytes = [];
       if(tapeBits[t]==="S") {         
-         for(;ptr<BIT_0_SIZE; ptr++) samples.push(0.75); 
+         for(;ptr<BIT_0_SIZE; ptr++) samples.push(VOLUME); 
          ptr -= BIT_0_SIZE;
-         for(;ptr<BIT_0_SIZE; ptr++) samples.push(-0.75);
+         for(;ptr<BIT_0_SIZE; ptr++) samples.push(-VOLUME);
          ptr -= BIT_0_SIZE;
       }
       else {
-         for(;ptr<BIT_1_SIZE; ptr++) samples.push(0.75); 
+         for(;ptr<BIT_1_SIZE; ptr++) samples.push(VOLUME); 
          ptr -= BIT_1_SIZE;
-         for(;ptr<BIT_1_SIZE; ptr++) samples.push(-0.75);
+         for(;ptr<BIT_1_SIZE; ptr++) samples.push(-VOLUME);
          ptr -= BIT_1_SIZE;
@@ -405,3 +423,3 @@ }
       const b = tapeBits[t];      
-      const s = (b == 0) ? -0.75 : 0.75;      
+      const s = (b == 0) ? -VOLUME : VOLUME;      
 
@@ -426,2 +444,1 @@ const pixelsize = TURBO_BIT_SIZE + elongations[t];
 }
-

package.json

 {
   "name": "laser500-wav",
-  "version": "0.0.1",
+  "version": "0.1.0",
   "description": "Laser500 program to WAV (tape) converter",
@@ -5,0 +5,0 @@ "main": "index.js",

No alert changes

Improved metrics

Total package byte prevSize

72442

increased by0.48%

Lines of code

664

increased by2.31%

No dependency changes