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Introducing the Audio API extension - Archive of obsolete content
this event has the following attributes: mozchannels: number of channels
mozsamplerate: sample rate per second mozframebufferlength: number of samples collected in all channels this information is needed later to decode the audio data stream.
... extracts the data from an audio element: <!doctype html> <html> <head> <title>javascript metadata example</title> </head> <body> <audio id="audio-element" src="song.ogg" controls="true" style="width: 512px;"> </audio> <script> function loadedmetadata() { channels = audio.mozchannels; rate = audio.
mozsamplerate; framebufferlength = audio.mozframebufferlength; } var audio = document.getelementbyid('audio-element'); audio.addeventlistener('loadedmetadata', loadedmetadata, false); </script> </body> </html> the mozaudioavailable event as the audio is played, sample data is made available to the audio layer and the audio buffer (size defined in mozframebufferlength) gets f...
...lement: <!doctype html> <html> <head> <title>javascript visualization example</title> </head> <body> <audio id="audio-element" src="revolve.ogg" controls="true" style="width: 512px;"> </audio> <pre id="raw">hello</pre> <script> function loadedmetadata() { channels = audio.mozchannels; rate = audio.
mozsamplerate; framebufferlength = audio.mozframebufferlength; } function audioavailable(event) { var framebuffer = event.framebuffer; var t = event.time; var text = "samples at: " + t + "\n"; text += framebuffer[0] + " " + framebuffer[1]; raw.innerhtml = text; } var raw = document.getelementbyid('raw'); var audio = document...
... a2.mozsetup(a1.mozchannels, a1.
mozsamplerate); } function audioavailable(event) { // write the current framebuffer var framebuffer = event.framebuffer; writeaudio(framebuffer); } a1.addeventlistener('mozaudioavailable', audioavailable, false); a1.addeventlistener('loadedmetadata', loadedmetadata, false); function writeaudio(audio) { buffers.push(audio); // if there's buffered data, write that while(buffers.length > 0) { ...
Visualizing an audio spectrum - Archive of obsolete content
="width: 512px;"> </audio> <div><canvas id="fft" width="512" height="200"></canvas></div> <script> var canvas = document.getelementbyid('fft'), ctx = canvas.getcontext('2d'), channels, rate, framebufferlength, fft; function loadedmetadata() { channels = audio.mozchannels; rate = audio.
mozsamplerate; framebufferlength = audio.mozframebufferlength; fft = new fft(framebufferlength / channels, rate); } function audioavailable(event) { var fb = event.framebuffer, t = event.time, /* unused, but it's there */ signal = new float32array(fb.length / channels), magnitude; for (var i = 0, fbl = framebufferlength / 2; i ...
Displaying a graphic with audio samples - Archive of obsolete content
height="200"></canvas></div> <img id="mozlogo" style="display:none" src="mozilla2.png"></img> <script> var canvas = document.getelementbyid('fft'), ctx = canvas.getcontext('2d'), channels, rate, framebufferlength, fft; function loadedmetadata() { channels = audio.mozchannels; rate = audio.
mozsamplerate; framebufferlength = audio.mozframebufferlength; fft = new fft(framebufferlength / channels, rate); } function audioavailable(event) { var fb = event.framebuffer, t = event.time, /* unused, but it's there */ signal = new float32array(fb.length / channels), magnitude; for (var i = 0, fbl = framebufferlength...