AudioChannelLayout, channel Order, kAudioChannelLayoutTag_UseChannelBitmap
AudioChannelLayout, channel Order, kAudioChannelLayoutTag_UseChannelBitmap
- Subject: AudioChannelLayout, channel Order, kAudioChannelLayoutTag_UseChannelBitmap
- From: Jamie Gjerde <email@hidden>
- Date: Thu, 4 Jan 2007 11:35:18 -0800 (PST)
i have a quicktime file with a 5.1 audio track. i get an AudioChannelLayout from the track that has an mChannelLayoutTag = kAudioChannelLayoutTag_UseChannelBitmap. mChannelBitmap is...
kAudioChannelBit_Left | kAudioChannelBit_Right | kAudioChannelBit_Center | kAudioChannelBit_LFEScreen | kAudioChannelBit_LeftSurround | kAudioChannelBit_RightSurround
the exact 6 channels i am looking for, however this just tells me what channels are there, not what order they are in. i know that when mChannelLayoutTag ==
kAudioChannelLayoutTag_UseChannelDescriptions the channel descriptions are in the same order as they appear in the audio buffer.
how can i know the order when there is a channel bitmap?
i have alternatives for dealing with this outside of QT - CoreAudio, i am just asking in this specific case when there is a channel
bitmap if there is any way i can know exactly what the channel ordering is in the bufffer. for the particular file i am reading, the channels happen to be in the exact order as the bit constants are defined in the enum.
l,r,c,lfe,ls,rs
thanks,
jamie
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