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→Complete Example: Creating a Web Based Tone Generator
<body>
<input type="text" size="4" id="freq" value="440"><label for="hz">Hz</label>
<button onclick="start()">play</button>
<button onclick="stop()">stop</button>
<script type="text/javascript">
var sampledata sampleRate = [];44100, var freq portionSize = 440;sampleRate / 10, var interval prebufferSize = -1;sampleRate / 2, var audio freq = undefined;// no sound
function startgetSoundData(t, size) { audio var soundData = new AudioFloat32Array(size); audioif (freq) { var k = 2* Math.mozSetupPI * freq / sampleRate; for (1, 44100, 1var i=0; i<size; i++);{ interval soundData[i] = setIntervalMath.sin(writeData, 10k * (i + t)); } } return soundData;
}
function stopwriteData() { if while(interval !audio.mozCurrentSampleOffset() + prebufferSize >= -1currentWritePosition) { clearIntervalvar soundData = getSoundData(currentWritePosition, portionSize); audio.mozWriteAudio(intervalsoundData); interval currentWritePosition += -1portionSize;
}
}
// initial write writeData(); var writeInterval = Math.floor(1000 * portionSize / sampleRate); setInterval(writeData, writeInterval); function generateWaveformstart() {
freq = parseFloat(document.getElementById("freq").value);
}
</script>
</body>
