web-audio-api

I'm working on a little project that decrypts (using openpgp.js) and decodes a server-side audio file using the Web Audio API. The decrypted file arrives to the client as raw audio. Currently I can play back audio files using source.start(0) but there doesn't seems to be an easy way to dump the audio to a GUI that would allow users to do things like adjust volume and seek through the audio. I have a AudioContext object that's decoded and buffered with createBufferSource function playSound(decodedAudio) { var source = context.createBufferSource(); source.buffer = decodedAudio; source.connect

I have been looking around for creating an audio equalizer using the Web audio API: http://webaudio.github.io/web-audio-api/ I found a lot of threads about creating a visualizer, but that is of course not what I want to do. I simply want to be able to alter the sound using frequency sliders. I found that the biquadFilter should do the work, but I can't get a good result. The sound is altered consistently when I change any frequency value, but it just lowers the quality of the sound while it should alter the frequencies. I first load a sound: Audio.prototype.init = function(callback){ var $this

I'm trying to create a realtime voice chat. once a client is holding a button and talks, I want the sound to be sent over the socket to the nodejs backend, then I want to stream this data to another client. here is the sender client code: socket.on('connect', function() { var session = { audio: true, video: false }; navigator.getUserMedia(session, function(stream){ var audioInput = context.createMediaStreamSource(stream); var bufferSize = 2048; recorder = context.createScriptProcessor(bufferSize, 1, 1); recorder.onaudioprocess = onAudio; audioInput.connect(recorder); recorder.connect(context

I am using Opentok JavaScript WebRTC library to host a 1-to-1 video chat (peer-to-peer). I can see my peer's video and hear the audio flawlessly. My wish is to record audio / video of other chat party (remote). For this purpose, I'm using RecordRTC . I was able to record the video of other chat participant (video is outputted to HTML video element), but, so far, I have not succeeded in recording audio (a dead-silence .wav file is as far as I could get). Using Chrome Canary (30.0.1554.0). This is my method: var clientVideo = $('#peerdiv video')[0];//peer's video (html element) var serverVideo =

Trying to merge two buffers into one; I have been able to create the two buffers from the audio files and load and play them. Now I need to merge the two buffers into one buffer. How can they get merged? context = new webkitAudioContext(); bufferLoader = new BufferLoader( context, [ 'audio1.mp3', 'audio2.mp3', ], finishedLoading ); bufferLoader.load(); function finishedLoading(bufferList) { // Create the two buffer sources and play them both together. var source1 = context.createBufferSource(); var source2 = context.createBufferSource(); source1.buffer = bufferList[0]; source2.buffer =

What I am trying to learn / do: How to set up a simple working convolver (reverb) into my code sandbox below using an impulse response. I thought it was similar to setting a filter but things seem quite different. What I tried: As with all new technologies things change at a fast pace making it difficult to know which implementation is correct and what is not. I looked at countless WebAudio Api Convolver Tutorials, many were old and others were working but far too "bloated" making it hard to understand what is going on. I tried to implement some of the examples from the mozilla documentation:

i'm trying to build a waveform generator that get audiofile amplitudes values and display them to a canvas as quick as possible (faster than realtime) in javascript. so i use the OfflineAudioContext / webkitOfflineAudioContext , load the file and start the analyse. the waveform is to fill a wide canvas. i analyse buffer in a processor.onaudioprocess function. (i guess it's the way it works ?) it works fine in firefox but i've got an issue in chrome : it seems it "jumps" over much analyse to finish it works as soon as possible and only returns a few coordinates (something like 16). here is the