audio - iOS 3D mixer works in iOS 5+ but not in iOS 4.3 -


i've set kaudiounitsubtype_au3dmixerembedded part of functional augraph. i've set output asbd of mixer following:

sample rate:              44100 format id:                 lpcm format flags:                 c // (kaudioformatflagissignedinteger | kaudioformatflagsnativeendian | kaudioformatflagispacked) frames per packet:            1 channels per frame:           2 bits per channel:            16 bytes per packet:             4 bytes per frame:              4

this audio graph works great when running on ios 5+, on ios 4.3, outputs weird distorted sounds sound nothing inputs. better understand this, used 1 mixer input , compared input bytes versus output bytes. on ios 5+, input , output bytes identical, expect. however, on ios 4.3, output bytes different. when i'm inputting in 0s mixer (0x0000, 0x0000, ...) , output bytes printing out stream of 0x8000 0x8000.

does have idea why 3d mixer behaves strangely on ios 4.3?


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