Re: newBe Question about buffers...
Re: newBe Question about buffers...
- Subject: Re: newBe Question about buffers...
- From: R <email@hidden>
- Date: Sat, 29 Dec 2012 23:25:07 -0700
Let me ask this a different way…
Listed below is the Canonical ASBD for streams between audio units in OSX.
How can I have 32 bits per channel and also have 4 bytes per frame/packet? I would think there would be 8 bytes per frame for 2channel audio.
mSampleRate Float64 44100
mFormatID UInt32 1819304813
mFormatFlags UInt32 41
mBytesPerPacket UInt32 4
mFramesPerPacket UInt32 1
mBytesPerFrame UInt32 4
mChannelsPerFrame UInt32 2
mBitsPerChannel UInt32 32
mReserved UInt32 0
On Dec 29, 2012, at 7:31 PM, R wrote:
>
> This question will be basic to most, but it has been bothering me for awhile. It has to do with buffers and floats.
>
> I want to size a buffer.
>
> The ASBD of the stream I'm dealing with is a follows:
>
> - Linear PCM
> - mFormatFlags=41, kAudioFormatFlagIsFloat, IsPacked, IsNoninterleaved
> - 2 channels per frame
> - 4 bytes per frame
>
> Since the stream in nonInterleaved, I will need to have a mBuffers[0] and mBuffers[1] in by BufferList struct
>
> I assume that I have 2 bytes for each channel (4 bytes per frame / 2)
>
> Here is my question:
>
> For kAudioFormatFlagIsSignedInteger, I size each buffer for an UInt16 (2 bytes = 16 bits)
>
> But, for kAudioFormtFlagIsFloat, there is no such thing as a Float16. I have to size each channel for a Float32 (32 bits of space).
>
> Here is my question, is the data value for each channel taking up only 16 bits of float data, but I have to size the buffer for Float32 and just assume wasted space?
>
> Thanks for your help and patience -- Ron
>
> å
>
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