Fix output interleaving/summing for iOS devices playing through mono speaker about novocaine HOT 4 CLOSED

@alexbw whenever you get a chance I'd like to get your input on this issue.

It seems that CoreAudio internally handles mono summing if the audio is playing through the mono device speaker. Hence, the render callback still gets two buffers to fill. The fix on this branch does the trick, but I'm wondering if novocaine should always request a stereo buffer from its output block, since iOS seems to always want a stereo buffer? So basically the block will always provide stereo data, and in whatever rare case that the callback only wants mono, the summation could then just be handled by novocaine.

I'm not sure if it's the same case for a mono output on OSX, but that seems far less common - it might take some clever configuration to make the default output device mono.

from novocaine.

I like the proposal, and in the absence of any (long-ago planned) non-IO
block functionality, this makes sense. Originally, I had planned an
expansion where Novocaine-style APIs existed on the front-end of a
multi-channel mixer, which would allow easy stringing together of arbitrary
audio processing functionality. That's just not something I'm ever going to
get to.

I'll take a look at the code soon.

On Tue, Jul 30, 2013 at 1:44 PM, Nick D. [email protected] wrote:

@alexbw https://github.com/alexbw whenever you get a chance I'd like to
get your input on this issue.

It seems that CoreAudio internally handles mono summing if the audio is
playing through the mono device speaker. Hence, the render callback still
gets two buffers to fill. The fix on this branchhttps://github.com/alexbw/novocaine/tree/DeviceChannelOutputFixdoes the trick, but I'm wondering if novocaine should always request a
stereo buffer from its output block, since iOS seems to always want a
stereo buffer? So basically the block will always provide stereo data, and
in whatever rare case that the callback only wants mono, the summation
could then just be handled by novocaine.

I'm not sure if it's the same case for a mono output on OSX, but that
seems far less common - it might take some clever configuration to make the
default output device mono.

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Reply to this email directly or view it on GitHubhttps://github.com//issues/52#issuecomment-21808810
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from novocaine.

@ndonald2, I've been out of the game for too long. Is this something that still should be merged?

from novocaine.

Looks like it's already been merged. I'll go ahead and close this issue.

from novocaine.