Audio vu meter1/2/2024 ![]() The following snippet will show, once started, the volume value of the meter object (from 0.00 to 1.00) in the console (respectively with console.log if the level is "normal" or with console.warn if the volume is "clipped") with the onLevelChange function: /** To retrieve only the values, you can simply remove all the code that is related to the canvas element from the previous script. In case you want to display a custom volume meter with your own style, then you would only need the values of the volume meter instead of displaying them on a canvas. You can check the working script that shows a basic implementation of the Volume Meter in your browser here (and displays it on a canvas). The previous code should display a simple canvas in bar-style that changes when you use the microphone: RafID = window.requestAnimationFrame( onLevelChange ) draw a bar based on the current volumeĬanvasContext.fillRect(0, 0, meter.volume * WIDTH * 1.4, HEIGHT) Create a new volume meter and connect it.ĬanvasContext.clearRect(0,0,WIDTH,HEIGHT) MediaStreamSource = audioContext.createMediaStreamSource(stream) }, onMicrophoneGranted, onMicrophoneDenied) Īlert('getUserMedia threw exception :' + e) ![]() Window.AudioContext = window.AudioContext || window.webkitAudioContext OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THEĬanvasContext = document.getElementById( "meter" ).getContext("2d") LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, IN NO EVENT SHALL THEĪUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,įITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR The above copyright notice and this permission notice shall be included in allĬopies or substantial portions of the Software. To use, copy, modify, merge, publish, distribute, sublicense, and/or sellĬopies of the Software, and to permit persons to whom the Software isįurnished to do so, subject to the following conditions: In the Software without restriction, including without limitation the rights Of this software and associated documentation files (the "Software"), to deal Permission is hereby granted, free of charge, to any person obtaining a copy It will try to access the User Media API and through the stream received as first argument in the onMicrophoneGranted callback, the input level of the microphone can be retrieved thanks to the functions of the plugin createAudioMeter and volumeAudioProcess: To show the known bar that goes green and red according to the input level of the microphone, you can use the following code. It's worth to say that the scripts ( getUserMedia) needs to be executed once the window is loaded, otherwise it will fail for obviously reasons. ![]() With those functions, you can now retrieve the sound level of the microphone and you can do anything of the following tasks: The point is, that the 2 functions of the plugin are available : createAudioMeter and volumeAudioProcess. Using Volume MeterĪs mentioned previously, the "plugin" are 2 functions, you can decide by your own if you want to declare them in the window or just add them as a new script in your document. This script was written by Chris Wilson at Google, visit the official repository in Github for more information. But if the goal is to get a general idea of a measurement of the sound level for your user, then it might be pretty useful.ĭownload the script of volume meter in the Github repository here. ![]() If you're working in some kind of scientific project about how to retrieve the sound level of the microphone through the browser, this ain't probably what you're looking for. Volume Meter is not a plugin, but a collection of 2 useful functions that will help you to retrieve the input level of the microphone through the WebAudio API. ![]() We are talking about an useful "Volume Meter" that comes in handy to display it graphically to warn the one that uses the system with the famous green and red bar, that he should speak quietly. As one of those weird projects that we like to share here in Our Code World, we bring you today one of those functions that you won't probably use in in your Laboral scene but in personal projects or just to expand your knowledge of Javascript. ![]()
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |