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Levels"},"bugs":{"url":"https://github.com/naomiaro/waveform-playlist/issues"},"license":"MIT","readme":"[Npm Package](https://www.npmjs.com/package/afripods-waveform-playlist)\n\n\n## Browser Support\n\nWaveform Playlist requires webaudio in the browser to function correctly: [Can I Use?](http://caniuse.com/#search=webaudio)\n\n## Installation\n\n`npm install afripods-waveform-playlist --save`\n\nHate npm? Check Unpkg: https://unpkg.com/browse/waveform-playlist/\n\n- If you want to download and run the already compiled website, navigate to folder `/dist` and run `python -m SimpleHTTPServer 8000`. The website will be available at `localhost:8000/waveform-playlist`.\n\n## Basic Usage\n\n```javascript\nimport WaveformPlaylist from \"waveform-playlist\";\n\nvar playlist = WaveformPlaylist({\n samplesPerPixel: 3000,\n mono: true,\n waveHeight: 70,\n container: document.getElementById(\"playlist\"),\n state: \"cursor\",\n colors: {\n waveOutlineColor: \"#E0EFF1\",\n timeColor: \"grey\",\n fadeColor: \"black\",\n },\n controls: {\n show: false,\n width: 150,\n },\n zoomLevels: [500, 1000, 3000, 5000],\n});\n\nplaylist\n .load([\n {\n src: \"media/audio/Vocals30.mp3\",\n name: \"Vocals\",\n gain: 0.5,\n },\n {\n src: \"media/audio/BassDrums30.mp3\",\n name: \"Drums\",\n start: 8.5,\n fadeIn: {\n duration: 0.5,\n },\n fadeOut: {\n shape: \"logarithmic\",\n duration: 0.5,\n },\n },\n {\n src: \"media/audio/Guitar30.mp3\",\n name: \"Guitar\",\n start: 23.5,\n fadeOut: {\n shape: \"linear\",\n duration: 0.5,\n },\n cuein: 15,\n },\n ])\n .then(function () {\n // can do stuff with the playlist.\n });\n```\n\n### Playlist Options\n\n```javascript\nvar options = {\n // webaudio api AudioContext\n ac: new (window.AudioContext || window.webkitAudioContext)(),\n\n // DOM container element REQUIRED\n container: document.getElementById(\"playlist\"),\n\n // sample rate of the project. (used for correct peaks rendering)\n sampleRate: new (\n window.AudioContext || window.webkitAudioContext\n ).sampleRate(),\n\n // number of audio samples per waveform peak.\n // must be an entry in option: zoomLevels.\n samplesPerPixel: 4096,\n\n // whether to draw multiple channels or combine them.\n mono: true,\n\n // enables \"exclusive solo\" where solo switches between tracks\n exclSolo: false,\n\n // default fade curve type.\n fadeType: \"logarithmic\", // (logarithmic | linear | sCurve | exponential)\n\n // whether or not to include the time measure.\n timescale: false,\n\n // control panel on left side of waveform\n controls: {\n // whether or not to include the track controls\n show: false,\n\n // width of controls in pixels\n width: 150,\n\n // whether to render the widget or not in the controls panel.\n widgets: {\n // Mute & solo button widget\n muteOrSolo: true,\n\n // Volume slider\n volume: true,\n\n // Stereo pan slider\n stereoPan: true,\n\n // Collapse track button\n collapse: true,\n\n // Remove track button\n remove: true,\n },\n },\n\n colors: {\n // color of the wave background\n waveOutlineColor: \"white\",\n\n // color of the time ticks on the canvas\n timeColor: \"grey\",\n\n // color of the fade drawn on canvas\n fadeColor: \"black\",\n },\n\n // height in pixels of each canvas element a waveform is on.\n waveHeight: 128,\n\n // width in pixels of waveform bars.\n barWidth: 1,\n\n // spacing in pixels between waveform bars.\n barGap: 0,\n\n // interaction state of the playlist\n // (cursor | select | fadein | fadeout | shift)\n state: \"cursor\",\n\n // (line | fill)\n seekStyle: \"line\",\n\n // Array of zoom levels in samples per pixel.\n // Smaller numbers have a greater zoom in.\n zoomLevels: [512, 1024, 2048, 4096],\n\n // Whether to automatically scroll the waveform while playing\n isAutomaticScroll: false,\n\n // configuration object for the annotations add on.\n annotationList: {\n // Array of annotations in [Aeneas](https://github.com/readbeyond/aeneas) JSON format\n annotations: [],\n\n // Whether the annotation texts will be in updateable contenteditable html elements\n editable: false,\n\n // User defined functions which can manipulate the loaded annotations\n controls: [\n {\n // class names for generated tag separated by '.'\n class: \"fa.fa-minus\",\n\n // title attribute for the generated tag\n title: \"Reduce annotation end by 0.010s\",\n\n // function which acts on the given annotation row\n // when the corresponding is clicked.\n action: (annotation, i, annotations, opts) => {\n // @param Object annotation - current annotation\n // @param Number i - index of annotation\n // @param Array annotations - array of annotations in the playlist\n // @param Object opts - configuration options available\n // - opts.linkEndpoints\n },\n },\n ],\n\n // If false when clicking an annotation id segment\n // playback will stop after segment completion.\n isContinuousPlay: false,\n\n // If true annotation endpoints will remain linked when dragged\n // if they were the same value before dragging started.\n linkEndpoints: false,\n\n // pass a custom function which will receive the mastergainnode for this playlist and the audio context's destination.\n // if you pass a function, you must connect these two nodes to hear sound at minimum.\n // if you need to clean something up when the graph is disposed, return a cleanup function. Waveform Playlist will cleanup the nodes passed as arguments.\n effects: function (masterGainNode, destination, isOffline) {\n // analyser nodes don't work offline.\n if (!isOffline) masterGainNode.connect(analyser);\n masterGainNode.connect(destination);\n\n // return function cleanup() {\n // // if you create webaudio nodes that need to be cleaned up do that here\n // // see the track effects example.\n // };\n },\n },\n};\n```\n\n### Track Options\n\n```javascript\n{\n // a media path for XHR, a Blob, a File, or an AudioBuffer object.\n src: 'media/audio/BassDrums30.mp3',\n\n // name that will display in the playlist control panel.\n name: 'Drums',\n\n // volume level of the track between [0-1]\n gain: 1,\n\n // whether the track should initially be muted.\n muted: false,\n\n // whether the track should initially be soloed.\n soloed: false,\n\n // time in seconds relative to the playlist\n // ex (track will start after 8.5 seconds)\n // DEFAULT 0 - track starts at beginning of playlist\n start: 8.5,\n\n // track fade in details\n fadeIn: {\n // fade curve shape\n // (logarithmic | linear | sCurve | exponential)\n shape: 'logarithmic',\n\n // length of fade starting from the beginning of this track, in seconds.\n duration: 0.5,\n },\n\n // track fade out details\n fadeOut: {\n // fade curve shape\n // (logarithmic | linear | sCurve | exponential)\n shape: 'logarithmic',\n\n //length of fade which reaches the end of this track, in seconds.\n duration: 0.5,\n }\n\n // where the waveform for this track should begin from\n // ex (Waveform will begin 15 seconds into this track)\n // DEFAULT start at the beginning - 0 seconds\n cuein: 15,\n\n // where the waveform for this track should end\n // ex (Waveform will end at 30 second into this track)\n // DEFAULT duration of the track\n cueout: 30,\n\n // custom class for unique track styling\n customClass: 'vocals',\n\n // custom background-color for the canvas-drawn waveform\n waveOutlineColor: '#f3f3f3',\n\n // interaction states allowed on this track.\n // DEFAULT - all true\n states: {\n cursor: true,\n fadein: true,\n fadeout: true,\n select: true,\n shift: true,\n },\n\n // pre-selected section on track.\n // ONLY ONE selection is permitted in a list of tracks, will take most recently set if multiple passed.\n // This track is marked as 'active'\n selected: {\n // start time of selection in seconds, relative to the playlist\n start: 5,\n\n // end time of selection in seconds, relative to the playlist\n end: 15,\n },\n\n // value from -1 (full left pan) to 1 (full right pan)\n stereoPan: 0,\n\n // pass a custom function which will receive the last graphnode for this track and the mastergainnode.\n // if you pass a function, you must connect these two nodes to hear sound at minimum.\n // if you need to clean something up when the graph is disposed, return a cleanup function. Waveform Playlist will cleanup the nodes passed as arguments.\n effects: function(graphEnd, masterGainNode, isOffline) {\n var reverb = new Tone.Reverb(1.2);\n\n Tone.connect(graphEnd, reverb);\n Tone.connect(reverb, masterGainNode);\n\n return function cleanup() {\n reverb.disconnect();\n reverb.dispose();\n }\n }\n}\n```\n\n### Playlist Events\n\nWaveform Playlist uses an instance of [event-emitter](https://www.npmjs.com/package/event-emitter) to send & receive messages from the playlist.\n\n```javascript\nimport EventEmitter from \"event-emitter\";\nimport WaveformPlaylist from \"waveform-playlist\";\n\nvar playlist = WaveformPlaylist(\n {\n container: document.getElementById(\"playlist\"),\n },\n\n // you can pass your own event emitter\n EventEmitter()\n);\n\n// retrieves the event emitter the playlist is using.\nvar ee = playlist.getEventEmitter();\n```\n\nAn example of using the event emitter to control the playlist can be found in [/dist/js/examples/emitter.js](https://github.com/naomiaro/waveform-playlist/blob/main/dist/waveform-playlist/js/emitter.js)\n\n#### Events to Invoke\n\n| event | arguments | description |\n| --------------------- |------------------------------------------------------| ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| `play` | `start:optional, end:optional` | Starts playout of the playlist. Takes optional Number parameters in seconds `start` and `end` to play just an audio segment. `start` can be passed without an `end` to play to the end of the track. |\n| `pause` | _none_ | Pauses playout of the playlist. |\n| `stop` | _none_ | Stops playout of the playlist. |\n| `rewind` | _none_ | Stops playout if playlist is playing, resets cursor to the beginning of the playlist. |\n| `fastforward` | _none_ | Stops playout if playlist is playing, resets cursor to the end of the playlist. |\n| `clear` | _none_ | Stops playout if playlist is playing, removes all tracks from the playlist. |\n| `record` | _none_ | Starts recording an audio track. Begins playout of other tracks in playlist if there are any. |\n| `zoomin` | _none_ | Changes zoom level to the next smallest entry (if one exists) from the array `zoomLevels`. |\n| `zoomout` | _none_ | Changes zoom level to the next largest entry (if one exists) from the array `zoomLevels`. |\n| `trim` | _none_ | Trims currently active track to the cursor selection. |\n| `statechange` | `cursor` / `select` / `fadein` / `fadeout` / `shift` | Changes interaction state to the state given. |\n| `fadetype` | `logarithmic` / `linear` / `sCurve` / `exponential` | Changes playlist default fade type. |\n| `newtrack` | `File` | Loads `File` object into the playlist. |\n| `volumechange` | `volume, track` | Set volume of `track` to `volume` (0-100) |\n| `mastervolumechange` | `volume` | Set a new master volume `volume` (0-100) |\n| `select` | `start, end, track:optional` | Seek to the start time or start/end selection optionally with active track `track`. |\n| `startaudiorendering` | `mp3` / `wav` / `buffer` | Request for a downloadable file or web Audio buffer that represent the current work |\n| `automaticscroll` | `true`/`false` | Change property `isAutomaticScroll`. |\n| `continuousplay` | `true`/`false` | Change property `isContinuousPlay`. |\n| `linkendpoints` | `true`/`false` | Change property `linkEndpoints`. |\n| `annotationsrequest` | _none_ | Requests to download the annotations to a json file. |\n| `stereopan` | `panvalue, track` | Set pan value of `track` to `panvalue` (-1-1) |\n\n#### Events to Listen to\n\n| event | arguments | description |\n| ------------------------- | ------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| `select` | `start, end, track` | Cursor selection has occurred from `start` to `end` with active Track `track`. |\n| `timeupdate` | `playbackPosition` | Sends current position of playout `playbackPosition` in seconds. |\n| `scroll` | `scrollLeft` | Sends current position of scroll `scrollLeft` in seconds. |\n| `statechange` | `state` | Sends current interaction state `state`. |\n| `shift` | `deltaTime, track` | Sends `deltaTime` in seconds change for Track `track` |\n| `mute` | `track` | Mute button has been pressed for `track` |\n| `solo` | `track` | Solo button has been pressed for `track` |\n| `removeTrack` | `track` | Remove button has been pressed for `track` |\n| `changeTrackView` | `track, opts` | Collapse button has been pressed for `track` |\n| `volumechange` | `volume, track` | Volume of `track` has changed to `volume` (0-100) |\n| `mastervolumechange` | `volume` | Master volume of the playlist has changed to `volume` (0-100) |\n| `audiorequeststatechange` | `state, src` | Loading audio `src` (`string` or `File`) is now in state [`state`](https://github.com/naomiaro/waveform-playlist/wiki/Track-Loading-States) (Number) |\n| `loadprogress` | `percent, src` | Loading audio `src` has loaded percent `percent` (0-100) |\n| `audiosourcesloaded` | _none_ | Audio decoding has finished for all tracks |\n| `audiosourcesrendered` | _none_ | Tracks are rendered to the playlist |\n| `audiosourceserror` | `err` | Error thrown while loading tracks |\n| `finished` | _none_ | Event fired when cursor ( while playing ) reaches the end (maximum duration) |\n| `audiorenderingstarting` | `offlineCtx, setUpPromiseArray` | Event fired after the OfflineAudioContext is created before any rendering begins. If any setup is async before offline redering, push a promise to the setUpPromiseArray. |\n| `audiorenderingfinished` | `type, data` | Return the result of the rendering in the desired format. `type` can be `buffer` or `wav` and can be used to dertermine the `data` type. When `type` is `wav`, data is a `blob` object that represent the wav file. |\n| `stereopan` | `panvalue, track` | Pan value of `track` has been changed to `panvalue` |\n\n## Tests\n\n`npm test`\n\n## Development without example changes\n\n`npm install && npm start`\n\nThis will install dependencies and start the webpack server.\n\n## Development with example changes\n\n`gem install jekyll`\n\nJekyll is needed if changes to the example pages will be done.\n\n`npm install && npm run dev`\n\nThis will build and watch the jekyll site and startup the webpack dev server.\n\n\n## License\n\n[MIT License](http://doge.mit-license.org)\n","readmeFilename":"README.md"}