Updated Windows to support exporting (#48)

Adds dataFormat parameter
Also fixed macOS exporting (#71)

README.md

@@ -59,11 +59,12 @@ say.speak(text, voice || null, speed || null, callback || null)
 
 #### Export Audio:
 
-* MacOS Only
+* MacOS & Windows Only (Windows ignores endian and data type parts of the dataFormat, can only output sample size to 8 or 16 bit)
 * Speed: 1 = 100%, 0.5 = 50%, 2 = 200%, etc
+* dataFormat: As per [macOS say](https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man1/say.1.html) e.g. "BEF16@22100" is big endian, floating point, 16bit, 22100kHz, defaults to "LEF32@32000" if unspecified
 
 ```javascript
-say.export(text, voice || null, speed || null, filename, callback || null)
+say.export(text, voice || null, speed || null, filename, callback || null, dataFormat || null)
 ```
 
 #### Stop Speaking:
@@ -80,7 +81,7 @@ Platform | Speak | Export | Stop | Speed | Voice
 ---------|-------|--------|------|-------|------
 macOS    | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: 
 Linux    | :white_check_mark: | :no_entry_sign:    | :white_check_mark: | :white_check_mark: | :white_check_mark: 
-Windows  | :white_check_mark: | :no_entry_sign:    | :white_check_mark: | :white_check_mark: | :white_check_mark:
+Windows  | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark:
 
 
 ## macOS Notes
@@ -94,11 +95,6 @@ say -v "?"
 As an example, the default voice is `Alex` and the voice used by Siri is `Samantha`.
 
 
-## Windows Notes
-
-The `.export()` method is not available.
-
-
 ## Linux Notes
 
 Linux support requires [Festival](http://www.cstr.ed.ac.uk/projects/festival/), which uses less friendly names for its voices. Voices for Festival sometimes need to be installed separately. You can check which voices are available by running `festival`, typing `(voice_`, and pressing Tab. Then take the name of the voice you'd like to try, minus the parentheses, and pass it in to say.js.

platform/base.js

@@ -63,8 +63,9 @@ class SayPlatformBase {
    * @param {number|null} speed Speed of text (e.g. 1.0 for normal, 0.5 half, 2.0 double)
    * @param {string} filename Path to file to write audio to, e.g. "greeting.wav"
    * @param {Function|null} callback A callback of type function(err) to return.
+   * @param {string} dataFormat A dataFormat string as per macOS say e.g. "BEF16@22100"
    */
-  export (text, voice, speed, filename, callback) {
+  export (text, voice, speed, filename, callback, dataFormat) {
     if (typeof callback !== 'function') {
       callback = () => {}
     }
@@ -83,8 +84,22 @@ class SayPlatformBase {
       })
     }
 
+    if (!dataFormat) {
+      dataFormat = 'LEF32@32000'
+    }
+    const dataFormatParts = /(BE|LE)(F|I|UI)(\d+)@(\d+)/.exec(dataFormat)
+    if (!dataFormatParts) {
+      throw new Error('Invalid dataFormat')
+    }
+    const dataFormatInfo = {
+      endian: dataFormatParts[1],
+      dataType: dataFormatParts[2],
+      sampleSize: parseInt(dataFormatParts[3], 10),
+      sampleRate: parseInt(dataFormatParts[4], 10)
+    }
+
     try {
-      var {command, args, pipedData, options} = this.buildExportCommand({text, voice, speed})
+      var {command, args, pipedData, options} = this.buildExportCommand({text, voice, speed, filename, dataFormatInfo})
     } catch (error) {
       return setImmediate(() => {
         callback(error)

platform/darwin.js

@@ -27,7 +27,7 @@ class SayPlatformDarwin extends SayPlatformBase {
     return {command: COMMAND, args, pipedData, options}
   }
 
-  buildExportCommand ({text, voice, speed, filename}) {
+  buildExportCommand ({text, voice, speed, filename, dataFormatInfo}) {
     let args = []
     let pipedData = ''
     let options = {}
@@ -43,7 +43,7 @@ class SayPlatformDarwin extends SayPlatformBase {
     }
 
     if (filename) {
-      args.push('-o', filename, '--data-format=LEF32@32000')
+      args.push('-o', filename, `--data-format=${dataFormatInfo.endian}${dataFormatInfo.dataType}${dataFormatInfo.sampleSize}@${dataFormatInfo.sampleRate}`)
     }
 
     return {command: COMMAND, args, pipedData, options}

platform/win32.js

@@ -11,7 +11,7 @@ class SayPlatformWin32 extends SayPlatformBase {
     this.baseSpeed = BASE_SPEED
   }
 
-  buildSpeakCommand ({text, voice, speed}) {
+  buildCommand ({text, voice, speed, filename, dataFormatInfo}) {
     let args = []
     let pipedData = ''
     let options = {}
@@ -27,6 +27,15 @@ class SayPlatformWin32 extends SayPlatformBase {
       psCommand += `$speak.Rate = ${adjustedSpeed};`
     }
 
+    if (filename) {
+      const audioBitsPerSample = (dataFormatInfo.sampleSize <= 8) ? 'Eight' : 'Sixteen'
+      const escapedFilename = filename.replace(/\\/g, '\\\\').replace(/"/g, '\\"\\"').replace(/`/g, '``')
+      psCommand += `$formatSampleSize = [System.Speech.AudioFormat.AudioBitsPerSample]::${audioBitsPerSample};`
+      psCommand += `$formatChannels = [System.Speech.AudioFormat.AudioChannel]::Mono;`
+      psCommand += `$format = New-Object System.Speech.AudioFormat.SpeechAudioFormatInfo ${dataFormatInfo.sampleRate}, $formatSampleSize, $formatChannels;`
+      psCommand += `$speak.SetOutputToWaveFile(\\"${escapedFilename}\\", $format);`
+    }
+
     psCommand += `$speak.Speak([Console]::In.ReadToEnd())`
 
     pipedData += text
@@ -36,8 +45,12 @@ class SayPlatformWin32 extends SayPlatformBase {
     return {command: COMMAND, args, pipedData, options}
   }
 
-  buildExportCommand ({text, voice, speed, filename}) {
-    throw new Error(`say.export(): does not support platform ${this.platform}`)
+  buildSpeakCommand ({text, voice, speed}) {
+    return this.buildCommand({text, voice, speed})
+  }
+
+  buildExportCommand ({text, voice, speed, filename, dataFormatInfo}) {
+    return this.buildCommand({text, voice, speed, filename, dataFormatInfo})
   }
 
   runStopCommand () {