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Audio Data API Review Version: Difference between revisions
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→Writing Audio
| Line 291: | Line 291: | ||
<audio id="a1" | <audio id="a1" | ||
src="song.ogg" | src="song.ogg" | ||
onloadedmetadata="loadedMetadata( | onloadedmetadata="loadedMetadata();" | ||
onaudiowritten="audioWritten(event);" | onaudiowritten="audioWritten(event);" | ||
controls="controls"> | controls="controls"> | ||
| Line 300: | Line 300: | ||
buffer = []; | buffer = []; | ||
function loadedMetadata( | function loadedMetadata() { | ||
// Mute a1 audio. | // Mute a1 audio. | ||
a1.volume = 0; | a1.volume = 0; | ||
// Setup a2 to be identical to a1, and play through there. | // Setup a2 to be identical to a1, and play through there. | ||
a2.mozSetup( | a2.mozSetup(a1.mozChannels, a1.mozSampleRate, 1); | ||
} | } | ||
| Line 329: | Line 329: | ||
</pre> | </pre> | ||
Audio data written using the '''mozWriteAudio()''' method needs to be written at a regular interval in equal portions, in order to keep a little ahead of the current sample offset (current sample offset of hardware can be obtained with '''mozCurrentSampleOffset()'''), where a little means something on the order of 500ms of samples. For example, if working with 2 channels at 44100 samples per second, | Audio data written using the '''mozWriteAudio()''' method needs to be written at a regular interval in equal portions, in order to keep a little ahead of the current sample offset (current sample offset of hardware can be obtained with '''mozCurrentSampleOffset()'''), where a little means something on the order of 500ms of samples. For example, if working with 2 channels at 44100 samples per second, a writing interval of 100ms, and a pre-buffer equal to 500ms, one would write an array of (2 * 44100 / 10) = 8820 samples, and a total of (currentSampleOffset + 2 * 44100 / 2). | ||
===== Complete Example: Creating a Web Based Tone Generator ===== | ===== Complete Example: Creating a Web Based Tone Generator ===== | ||