You can do this by passing the destination property of your audio context to the connect() function of your source. You can route your source through a complex graph of nodes (which is covered in the next section, Routing and Mixing Sounds), but for now, connect it directly to the destination of your audio context. Now that you have your source buffered or synthesized, for sound to emit from your speakers you need to connect your source to a destination. You can adjust the sound of the emitted tones in the same fashion as adjusting any source, as further described in, Routing and Mixing Sounds. Var waveTable = myAudioContext.createWaveTable(curve1, curve2) Var curve2 = new Float32Array(curveLength) Ĭurve1 = Math.sin(Math.PI * i / curveLength) Ĭurve2 = s(Math.PI * i / curveLength) Var curve1 = new Float32Array(curveLength) Acceptable values for the type property are listed in Table 3-1. Create an oscillator with the createOscillator() constructor, and assign a waveform to its type property. Oscillators are great for creating beeps and single notes.
Instead of loading a preexisting audio file, you can generate sounds with the Oscillator object. This can be used, for example, to change the pitch of the video’s sound dynamically while the video plays. Pass a reference to your desired media element to return a buffered source.
#Javascript html5 video change pitch manual
If you want to pull the audio of an or element that’s already on the page, you can bypass both the XMLHttpRequest creation and manual buffering steps by calling your audio context’s createMediaElementSource() function. The decodeAudioData() function provides an optional third parameter you can use to catch errors. Instead of calling createBuffer() directly, you can create a buffer by using the decodeAudioData() function on your audio context. Source.buffer = myAudioContext.createBuffer(request.response, false) Var source = myAudioContext.createBufferSource()
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