update demo [ci skip]

Author: mohayonao

demo/.gitignore

@@ -0,0 +1 @@
+out.wav

demo/index.js

@@ -2,6 +2,7 @@
 
 const fs = require("fs");
 const optionator = require("optionator")(require("./package").cliOptions);
+const tickable = require("tickable-timer");
 const wae = require("../src");
 
 function requireSourceIfExists(filepath) {
@@ -15,7 +16,7 @@ function requireSourceIfExists(filepath) {
 function createContextOptions(opts) {
   return Object.assign({
     sampleRate: +opts.rate,
-    numberOfChannels: opts.channels|0,
+    numberOfChannels: Math.max(1, opts.channels|0),
   }, {
     u8: { bitDepth: 8 },
     s16: { bitDepth: 16 },
@@ -25,12 +26,27 @@ function createContextOptions(opts) {
 }
 
 function createPrintFunc(opts) {
-  if (opts.noShowProgress) {
-    return () => {};
+  if (opts.verbose) {
+    return (msg) => {
+      process.stderr.write(msg + "\n");
+    };
   }
-  return (msg) => {
-    process.stderr.write(msg + "\n");
-  };
+  return () => {};
+}
+
+function fetchAudioBuffer(context, filename) {
+  if (Array.isArray(filename)) {
+    return Promise.all(filename.map(filename => fetchAudioBuffer(context, filename)));
+  }
+
+  return new Promise((resolve, reject) => {
+    fs.readFile(`${ __dirname }/assets/sound/${ filename }`, (err, data) => {
+      if (err) {
+        return reject(err);
+      }
+      resolve(context.decodeAudioData(data));
+    });
+  });
 }
 
 function showHelp() {
@@ -58,20 +74,78 @@ function main(opts) {
     return console.log(`demo: ${ name } is not found`);
   }
 
-  runWithStreamAudioContext(func, opts);
+  if (opts.out) {
+    runWithRenderingAudioContext(func, opts);
+  } else {
+    runWithStreamAudioContext(func, opts);
+  }
+}
+
+function runWithRenderingAudioContext(func, opts) {
+  const AudioContext = wae.RenderingAudioContext;
+  const context = new AudioContext(createContextOptions(opts));
+
+  let isEnded = false;
+
+  const util = {
+    fetchAudioBuffer: fetchAudioBuffer.bind(null, context),
+    timerAPI: tickable,
+    print: createPrintFunc(opts),
+    end: () => { isEnded = true }
+  };
+
+  const promise = func(context, util) || Promise.resolve();
+
+  promise.then(() => {
+    let currentTime = 0;
+    let counter = 0;
+
+    const beginTime = Date.now();
+    const duration = Math.max(0, opts.duration) || 10;
+    const numberOfProcessing = Math.ceil((duration * context.sampleRate) / context.processingSizeInFrames);
+    const processingTimeInFrames = context.processingSizeInFrames / context.sampleRate;
+
+    for (let i = 0; i < numberOfProcessing && !isEnded; i++) {
+      tickable.tick(processingTimeInFrames * 1000);
+      context.processTo(processingTimeInFrames * i);
+    }
+
+    const endTime = Date.now();
+    const outputFilename = opts.out || "out.wav";
+    const audioData = context.exportAsAudioData();
+
+    context.encodeAudioData(audioData).then((arrayBuffer) => {
+      fs.writeFile(outputFilename, new Buffer(arrayBuffer), (err) => {
+        if (err) {
+          console.error(err);
+        } else {
+          const renderingTime = (endTime - beginTime) / 1000;
+          const duration = context.currentTime;
+
+          console.log(`rendering time: ${ renderingTime }sec; duration: ${ duration }sec`);
+        }
+      });
+    });
+  });
 }
 
 function runWithStreamAudioContext(func, opts) {
   const AudioContext = wae.StreamAudioContext;
   const context = new AudioContext(createContextOptions(opts));
-
-  func(context, {
+  const util = {
+    fetchAudioBuffer: fetchAudioBuffer.bind(null, context),
     timerAPI: global,
-    print: createPrintFunc(opts)
-  });
+    print: createPrintFunc(opts),
+    end: () => { process.exit(0) }
+  };
 
   context.pipe(process.stdout);
-  context.resume();
+
+  const promise = func(context, util) || Promise.resolve();
+
+  promise.then(() => {
+    context.resume();
+  });
 }
 
 const opts = optionator.parse(process.argv);

demo/package.json

@@ -39,18 +39,31 @@
         "default": "2"
       },
       {
-        "option": "no-show-progress",
-        "alias": "q",
+        "option": "duration",
+        "alias": "d",
+        "type": "Number",
+        "description": "Number of duration for rendering"
+      },
+      {
+        "option": "out",
+        "alias": "o",
+        "type": "String",
+        "description": "Write output to <file>"
+      },
+      {
+        "option": "verbose",
+        "alias": "V",
         "type": "Boolean",
-        "description": "Run in quite mode",
+        "description": "Run in verbose mode",
         "default": "false"
       }
     ],
     "append": "AUDIO FILE FORMATS: s16 s32 u8 raw"
   },
-  "dependencies": {},
-  "devDependencies": {
-    "optionator": "^0.8.1"
+  "dependencies": {
+    "optionator": "^0.8.1",
+    "power-assert": "^1.3.1",
+    "tickable-timer": "^1.0.0"
   },
   "license": "MIT",
   "main": "index.js",