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I'm currently converting a Float32Array to an Int32Array for input to a real-time audio raw PCM to MP3 recording application.

new Int32Array([...new Float32Array(b)].map(f=>f<0?f*32768:f*32767)

The examples in the wild I've seen convert each float individually to avoid static, gaps, glitches when the audio recording is played back. I have a sense there is a way to do this without comparing each float, though I've seen no such examples in the wild for audio processing.

Looking at the I wonder is there a way to do this without comparing each float, basically, what is the shortest code to convert a Float32Array to a Int32Array or Int16Array for audio processing?

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    \$\begingroup\$ Note that in general Int32Array.from(new Float32Array(b), f => f * 32768) or some such is generally more efficient than round-tripping through an intermediate array. \$\endgroup\$ Commented Mar 9, 2024 at 20:37
  • \$\begingroup\$ @Neil 8**5 reduces by 1 character. \$\endgroup\$ Commented Mar 9, 2024 at 21:37
  • \$\begingroup\$ @Neil We get glitches in the audio recording using either f*32768 or f*8**5. \$\endgroup\$ Commented Mar 9, 2024 at 21:55
  • \$\begingroup\$ Sorry, I was just making a general efficiency comment, not a golfing suggestion. As such I just used a simple example. In particular I don't know what value range you're getting or what you're expected to map it to. \$\endgroup\$ Commented Mar 10, 2024 at 0:21
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    \$\begingroup\$ I found this blog post which shows how confusing this is. Out of those, I think the one used by PulseAudio seems to be the most straightforward. \$\endgroup\$ Commented Mar 10, 2024 at 9:25

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