update interface button styles

node_modules/zzfx/wav.js

@@ -0,0 +1,62 @@
+// wav.js by Frank Force - https://github.com/KilledByAPixel/ZzFX
+
+export function buildWavBlob(sampleChannels, sampleRate = 44100)
+{
+    // adapted from https://gist.github.com/asanoboy/3979747
+    const channelCount = sampleChannels.length;
+    const sampleCount = sampleChannels[0].length;
+    const length = channelCount * sampleCount;
+    const buffer = new Int16Array(length + 23);
+
+    console.assert(channelCount && sampleCount, 'No channels or samples found!');
+    
+    // wave header
+    buffer[ 0] = 0x4952; // RI
+    buffer[ 1] = 0x4646; // FF
+    buffer[ 2] = (2*length + 15) & 0x0000ffff; // RIFF size
+    buffer[ 3] = ((2*length + 15) & 0xffff0000) >> 16; // RIFF size
+    buffer[ 4] = 0x4157; // WA
+    buffer[ 5] = 0x4556; // VE
+    buffer[ 6] = 0x6d66; // fm
+    buffer[ 7] = 0x2074; // t
+    buffer[ 8] = 0x0012; // fmt chunksize: 18
+    buffer[ 9] = 0x0000; //
+    buffer[10] = 0x0001; // format tag : 1 
+    buffer[11] = channelCount; // channelCount
+    buffer[12] = sampleRate & 0x0000ffff; // sample per sec
+    buffer[13] = (sampleRate & 0xffff0000) >> 16; // sample per sec
+    buffer[14] = (2*channelCount*sampleRate) & 0x0000ffff; // byte per sec
+    buffer[15] = ((2*channelCount*sampleRate) & 0xffff0000) >> 16; // byte per sec
+    buffer[16] = 0x0004; // block align
+    buffer[17] = 0x0010; // bit per sample
+    buffer[18] = 0x0000; // cb size
+    buffer[19] = 0x6164; // da
+    buffer[20] = 0x6174; // ta
+    buffer[21] = (2*length) & 0x0000ffff; // data size[byte]
+    buffer[22] = ((2*length) & 0xffff0000) >> 16; // data size[byte]	
+
+    // copy samples to buffer
+    for (let i = 0; i < sampleCount; i++)
+    for (let j = 0; j < channelCount; j++)
+    {
+        const s = sampleChannels[j][i];
+        buffer[i*channelCount + j + 23] = s>=1 ? (1<<15) - 1 : (s * (1<<15) | 0);
+    }
+
+    // build the blob
+    let end = 0;
+    let bufferNeedle = 0;
+    const blobData = [];
+    const GetBuffer = (length) =>
+    {
+        end = bufferNeedle + length >= buffer.length;
+        const rt = new Int16Array(end? buffer.length - bufferNeedle : length);
+        for(let i = 0; i < rt.length; i++)
+            rt[i] = buffer[i + bufferNeedle];
+        bufferNeedle += rt.length;
+        return rt.buffer;
+    }
+    while ( !end ) blobData.push(GetBuffer(1e3));
+    
+    return new Blob(blobData, {type:'audio/wav'});
+}