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Merge pull request #54 from jitsi/modern-constraints
Modern constraints
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,35 +1,178 @@ | ||
| 'use strict'; | ||
|
|
||
| const DEFAULT_AUDIO_CONSTRAINTS = {}; | ||
|
|
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| const DEFAULT_VIDEO_CONSTRAINTS = { | ||
| facingMode: 'user', | ||
| frameRate: 30, | ||
| height: 720, | ||
| width: 1280 | ||
| }; | ||
|
|
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| const ASPECT_RATIO = 16 / 9; | ||
|
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| const STANDARD_OA_OPTIONS = [ | ||
| 'iceRestart', | ||
| 'offerToReceiveAudio', | ||
| 'offerToReceiveVideo', | ||
| 'voiceActivityDetection' | ||
| ]; | ||
|
|
||
| function getDefaultMediaConstraints(mediaType) { | ||
| switch(mediaType) { | ||
| case 'audio': | ||
| return DEFAULT_AUDIO_CONSTRAINTS; | ||
| case 'video': | ||
| return DEFAULT_VIDEO_CONSTRAINTS; | ||
| default: | ||
| throw new TypeError(`Invalid media type: ${mediaType}`); | ||
| } | ||
| } | ||
|
|
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| function extractString(constraints, prop) { | ||
| const value = constraints[prop]; | ||
| const type = typeof value; | ||
|
|
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| if (type === 'object') { | ||
| for (const v of [ 'exact', 'ideal' ]) { | ||
| if (value[v]) { | ||
| return value[v]; | ||
| } | ||
| } | ||
| } else if (type === 'string') { | ||
| return value; | ||
| } | ||
| } | ||
|
|
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| function extractNumber(constraints, prop) { | ||
| const value = constraints[prop]; | ||
| const type = typeof value; | ||
|
|
||
| if (type === 'number') { | ||
| return Number.parseInt(value); | ||
| } else if (type === 'object') { | ||
| for (const v of [ 'exact', 'ideal', 'min', 'max' ]) { | ||
| if (value[v]) { | ||
| return Number.parseInt(value[v]); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| function normalizeMediaConstraints(constraints, mediaType) { | ||
| switch(mediaType) { | ||
| case 'audio': | ||
| return constraints; | ||
| case 'video': { | ||
| let c; | ||
| if (constraints.mandatory) { | ||
| // Old style. | ||
| c = { | ||
| deviceId: extractString(constraints.optional || {}, 'sourceId'), | ||
| facingMode: extractString(constraints, 'facingMode'), | ||
| frameRate: extractNumber(constraints.mandatory, 'minFrameRate'), | ||
| height: extractNumber(constraints.mandatory, 'minHeight'), | ||
| width: extractNumber(constraints.mandatory, 'minWidth') | ||
| }; | ||
| } else { | ||
| // New style. | ||
| c = { | ||
| deviceId: extractString(constraints, 'deviceId'), | ||
| facingMode: extractString(constraints, 'facingMode'), | ||
| frameRate: extractNumber(constraints, 'frameRate'), | ||
| height: extractNumber(constraints, 'height'), | ||
| width: extractNumber(constraints, 'width') | ||
| }; | ||
| } | ||
|
|
||
| if (!c.deviceId) { | ||
| delete c.deviceId; | ||
| } | ||
|
|
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| if (!c.facingMode || (c.facingMode !== 'user' && c.facingMode !== 'environment')) { | ||
| c.facingMode = DEFAULT_VIDEO_CONSTRAINTS.facingMode; | ||
| } | ||
|
|
||
| if (!c.frameRate) { | ||
| c.frameRate = DEFAULT_VIDEO_CONSTRAINTS.frameRate; | ||
| } | ||
|
|
||
| if (!c.height && !c.width) { | ||
| c.height = DEFAULT_VIDEO_CONSTRAINTS.height; | ||
| c.width = DEFAULT_VIDEO_CONSTRAINTS.width; | ||
| } else if (!c.height) { | ||
| c.height = Math.round(c.width / ASPECT_RATIO); | ||
| } else if (!c.width) { | ||
| c.width = Math.round(c.height * ASPECT_RATIO); | ||
| } | ||
|
|
||
| return c; | ||
| } | ||
| default: | ||
| throw new TypeError(`Invalid media type: ${mediaType}`); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Internal util for deep clone object. Object.assign() only does a shallow copy | ||
| * | ||
| * @param {Object} obj - object to be cloned | ||
| * @return {Object} cloned obj | ||
| */ | ||
| function _deepClone(obj) { | ||
| return JSON.parse(JSON.stringify(obj)); | ||
| return JSON.parse(JSON.stringify(obj)); | ||
| } | ||
|
|
||
| /** | ||
| * Merge custom constraints with the default one. The custom one take precedence. | ||
| * Normalize options passed to createOffer() / createAnswer(). | ||
| * | ||
| * @param {Object} custom - custom webrtc constraints | ||
| * @param {Object} def - default webrtc constraints | ||
| * @return {Object} constraints - merged webrtc constraints | ||
| * @param {Object} options - user supplied options | ||
| * @return {Object} newOptions - normalized options | ||
| */ | ||
| export function mergeMediaConstraints(custom, def) { | ||
| const constraints = (def ? _deepClone(def) : {}); | ||
| if (custom) { | ||
| if (custom.mandatory) { | ||
| constraints.mandatory = {...constraints.mandatory, ...custom.mandatory}; | ||
| export function normalizeOfferAnswerOptions(options = {}) { | ||
| const newOptions = {}; | ||
|
|
||
| if (!options) { | ||
| return newOptions; | ||
| } | ||
| if (custom.optional && Array.isArray(custom.optional)) { | ||
| // `optional` is an array, webrtc only finds first and ignore the rest if duplicate. | ||
| constraints.optional = custom.optional.concat(constraints.optional); | ||
|
|
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| // Convert standard options into WebRTC internal constant names. | ||
| // See: https://github.com/jitsi/webrtc/blob/0cd6ce4de669bed94ba47b88cb71b9be0341bb81/sdk/media_constraints.cc#L113 | ||
| for (const [ key, value ] of Object.entries(options)) { | ||
| if (STANDARD_OA_OPTIONS.indexOf(key) !== -1) { | ||
| // offerToReceiveAudio -> OfferToReceiveAudio | ||
| const newKey = key.charAt(0).toUpperCase() + key.slice(1); | ||
| newOptions[newKey] = String(Boolean(value)); | ||
| } else { | ||
| newOptions[key] = value; | ||
| } | ||
| } | ||
| if (custom.facingMode) { | ||
| constraints.facingMode = custom.facingMode.toString(); // string, 'user' or the default 'environment' | ||
|
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| return newOptions; | ||
| } | ||
|
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| /** | ||
| * Normalize the given constraints in something we can work with. | ||
| */ | ||
| export function normalizeConstraints(constraints) { | ||
| const c = _deepClone(constraints); | ||
|
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| for (const mediaType of [ 'audio', 'video' ]) { | ||
| const mediaTypeConstraints = c[mediaType]; | ||
| const typeofMediaTypeConstraints = typeof mediaTypeConstraints; | ||
|
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| if (typeofMediaTypeConstraints !== 'undefined') { | ||
| if (typeofMediaTypeConstraints === 'boolean') { | ||
| if (mediaTypeConstraints) { | ||
| c[mediaType] = getDefaultMediaConstraints(mediaType); | ||
| } | ||
| } else if (typeofMediaTypeConstraints === 'object') { | ||
| c[mediaType] = normalizeMediaConstraints(mediaTypeConstraints, mediaType); | ||
| } else { | ||
| throw new TypeError(`constraints.${mediaType} is neither a boolean nor a dictionary`); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| return constraints; | ||
|
|
||
| return c; | ||
| } |
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