Initial commit

.gitignore

@@ -0,0 +1,6 @@
+*.log
+.DS_Store
+.nyc_output
+coverage
+node_modules
+package-lock.json

.jshintrc

@@ -0,0 +1,4 @@
+{
+  "esversion": 6,
+  "sub": true
+}

.npmignore

@@ -0,0 +1,6 @@
+test
+.nyc_output
+.jshintrc
+.travis.yml
+appveyor.yml
+webpack.config.js

.travis.yml

@@ -0,0 +1,10 @@
+language: node_js
+os:
+  - linux
+node_js:
+  - "7"
+  - "8"
+script:
+  - npm run build
+after_success:
+  - npm run coverage

LICENSE

@@ -0,0 +1,20 @@
+Copyright (c) 2018 Rafael da Silva Rocha.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

@@ -0,0 +1,50 @@
+# low-pass-filter
+Copyright (c) 2018 Rafael da Silva Rocha.  
+MIT License.
+
+## About
+LPF. This is a audio FX.
+
+## Install
+```
+npm install low-pass-filter
+```
+
+## Use
+```javascript
+
+/**
+ * Apply LPF to an array of samples.
+ * @param {!Array<number>} samples The samples.
+ * @param {!number} cutoff The cutoff frequency.
+ * @param {!number} sampleRate The sample rate.
+ * @param {!number} numChannels The number of channels.
+ */
+function lowPassFilter(samples, cutoff, sampleRate, numChannels) {}
+```
+
+### References
+https://github.com/jiaaro/pydub/blob/master/pydub/effects.py#L187  
+http://stackoverflow.com/questions/13882038/implementing-simple-high-and-low-pass-filters-in-c
+
+## LICENSE
+Copyright (c) 2018 Rafael da Silva Rocha.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

appveyor.yml

@@ -0,0 +1,21 @@
+environment:
+  matrix:
+    - nodejs_version: "7"
+    - nodejs_version: "8"
+
+install:
+  - ps: Install-Product node $env:nodejs_version
+  - npm -g install npm@latest
+  - npm install
+
+test_script:
+  - node --version
+  - npm --version
+  - cmd: npm run build
+
+build: off
+
+version: "{build}"
+
+matrix:
+  fast_finish: true

compile.js

@@ -0,0 +1,6 @@
+/*
+ * Copyright (c) 2018 Rafael da Silva Rocha.
+ * MIT License.
+ */
+const lowPassFilter = require("./index.js");
+window['lowPassFilter'] = lowPassFilter;