recordrtc/dev/RecordRTC-Configuration.js

RecordRTC is a server-less (entire client-side) JavaScript library can be used to record WebRTC audio/video media streams. It supports cross-browser audio/video recording.

// __________________________
// RecordRTC-Configuration.js

/**
 * {@link RecordRTCConfiguration} is an inner/private helper for {@link RecordRTC}.
 * @summary It configures the 2nd parameter passed over {@link RecordRTC} and returns a valid "config" object.
 * @license {@link https://github.com/muaz-khan/RecordRTC#license|MIT}
 * @author {@link http://www.MuazKhan.com|Muaz Khan}
 * @typedef RecordRTCConfiguration
 * @class
 * @example
 * var options = RecordRTCConfiguration(mediaStream, options);
 * @see {@link https://github.com/muaz-khan/RecordRTC|RecordRTC Source Code}
 * @param {MediaStream} mediaStream - MediaStream object fetched using getUserMedia API or generated using captureStreamUntilEnded or WebAudio API.
 * @param {object} config - {type:"video", disableLogs: true, numberOfAudioChannels: 1, bufferSize: 0, sampleRate: 0, video: HTMLVideoElement, getNativeBlob:true, etc.}
 */

function RecordRTCConfiguration(mediaStream, config) {
    if (config.recorderType && !config.type) {
        if (config.recorderType === WhammyRecorder || config.recorderType === CanvasRecorder) {
            config.type = 'video';
        } else if (config.recorderType === GifRecorder) {
            config.type = 'gif';
        } else if (config.recorderType === StereoAudioRecorder) {
            config.type = 'audio';
        } else if (config.recorderType === MediaStreamRecorder) {
            if (mediaStream.getAudioTracks().length && mediaStream.getVideoTracks().length) {
                config.type = 'video';
            } else if (mediaStream.getAudioTracks().length && !mediaStream.getVideoTracks().length) {
                config.type = 'audio';
            } else if (!mediaStream.getAudioTracks().length && mediaStream.getVideoTracks().length) {
                config.type = 'audio';
            } else {
                // config.type = 'UnKnown';
            }
        }
    }

    if (typeof MediaStreamRecorder !== 'undefined' && typeof MediaRecorder !== 'undefined' && 'requestData' in MediaRecorder.prototype) {
        if (!config.mimeType) {
            config.mimeType = 'video/webm';
        }

        if (!config.type) {
            config.type = config.mimeType.split('/')[0];
        }

        if (!config.bitsPerSecond) {
            // config.bitsPerSecond = 128000;
        }
    }

    // consider default type=audio
    if (!config.type) {
        if (config.mimeType) {
            config.type = config.mimeType.split('/')[0];
        }
        if (!config.type) {
            config.type = 'audio';
        }
    }

    return config;
}