Switch the backend from mpg123 to libao

.travis.yml

@@ -8,7 +8,7 @@ addons:
       - ubuntu-toolchain-r-test
     packages:
       - g++-4.8
-      - libasound2-dev
+      - libao-dev
 
 language: node_js
 
@@ -17,12 +17,16 @@ node_js:
   - "6"
   - "7"
   - "8"
+  - "9"
 
 install:
   - PATH="`npm bin`:`npm bin -g`:$PATH"
   # Install dependencies and build
   - npm install
 
+before_script:
+  - "echo 'default_driver=null' | sudo tee /etc/libao.conf"
+
 script:
   # Output useful info for debugging
   - node --version

README.md

@@ -6,23 +6,28 @@
 [![Build Status](https://ci.appveyor.com/api/projects/status/wix7wml3v55670kw?svg=true)](https://ci.appveyor.com/project/TooTallNate/node-speaker)
 
 A Writable stream instance that accepts [PCM audio][pcm] data and outputs it
-to the speakers. The output is backed by `mpg123`'s audio output modules, which
-in turn use any number of audio backends commonly found on Operating Systems
-these days.
+to the speakers. The output is backed by [libao][ao], which supports
+a ton of audio backends.
+
 
 ## Installation
 
-Simply compile and install `node-speaker` using `npm`:
+You need `libao` installed on your system before installig `node-speaker`.
+
+- Debian
+```sh
+$ apt-get install libao-dev
+```
 
+- OSX:
 ```sh
-npm install speaker
+$ brew install libao
 ```
 
-On Debian/Ubuntu, the [ALSA][alsa] backend is selected by default, so be sure
-to have the `alsa.h` header file in place:
+Now, simply compile and install `node-speaker` using `npm`:
 
 ```sh
-sudo apt-get install libasound2-dev
+$ npm install speaker
 ```
 
 ## Example
@@ -58,44 +63,24 @@ base class options, as well as any of these PCM formatting options:
 * `channels` - The number of audio channels. PCM data must be interleaved. Defaults to `2`.
 * `bitDepth` - The number of bits per sample. Defaults to `16` (16-bit).
 * `sampleRate` - The number of samples per second per channel. Defaults to `44100`.
-* `signed` - Boolean specifying if the samples are signed or unsigned. Defaults to `true` when bit depth is 8-bit, `false` otherwise.
-* `float` - Boolean specifying if the samples are floating-point values. Defaults to `false`.
-* `samplesPerFrame` - The number of samples to send to the audio backend at a time. You likely don't need to mess with this value. Defaults to `1024`.
 
 #### "open" event
 
 Fired when the backend `open()` call has completed. This happens once the first
 `write()` call happens on the speaker instance.
 
-#### "flush" event
-
-Fired after the speaker instance has had `end()` called, and after the audio data
-has been flushed to the speakers.
-
 #### "close" event
 
 Fired after the "flush" event, after the backend `close()` call has completed.
 This speaker instance is essentially finished after this point.
 
 ## Audio Backend Selection
 
-`node-speaker` is backed by `mpg123`'s "output modules", which in turn use one of
-many popular audio backends like ALSA, OSS, SDL, and lots more. The default
-backends for each operating system are described in the table below:
-
-| **Operating System** | **Audio Backend** | **Description**
-|:---------------------|:------------------|:----------------------------------
-| Linux                | `alsa`            | Output audio using [Advanced Linux Sound Architecture (ALSA)][alsa].
-| Mac OS X             | `coreaudio`       | Output audio using Mac OS X's CoreAudio.
-| Windows              | `win32`           | Audio output for Windows (winmm).
-| Solaris              | `sun`             | Audio output for Sun Audio.
-
-To manually override the default backend, pass the `--mpg123-backend` switch to
-`npm`/`node-gyp`:
-
-```sh
-npm install speaker --mpg123-backend=openal
-```
+`node-speaker` is backed by `libao`'s "output modules", which in turn use one of
+many popular audio backends like ALSA, pulseaudio, and lots more. The default
+backends for each operating system depend on libao configuration. Please check
+[libao's documentation][aodoc] for more information.
 
 [pcm]: http://en.wikipedia.org/wiki/Pulse-code_modulation
-[alsa]: http://www.alsa-project.org/
+[ao]: https://www.xiph.org/ao/
+[aodoc]: https://xiph.org/ao/doc/config.html

appveyor.yml

@@ -11,6 +11,7 @@ environment:
     - nodejs_version: "6"
     - nodejs_version: "7"
     - nodejs_version: "8"
+    - nodejs_version: "9"
 
 platform:
   - x86

binding.gyp

@@ -5,12 +5,21 @@
       'sources': [
         'src/binding.cc',
       ],
-      "include_dirs" : [
+      'include_dirs' : [
         '<!(node -e "require(\'nan\')")'
       ],
-      'dependencies': [
-        'deps/mpg123/mpg123.gyp:output'
-      ],
+      'conditions': [
+        ['OS=="linux"', {
+          'cflags': [
+            '<!@(pkg-config --cflags ao)'
+          ],
+          'ldflags': [
+            '<!@(pkg-config  --libs-only-L ao)'
+          ],
+          'libraries': [
+            '<!@(pkg-config  --libs-only-l ao)'
+          ]
+        }]]
     }
   ]
 }