Apple

Hi,

I've facing some problems with kAudioChannelLayoutTag_UseChannelDescriptions implementation.

When I report this layout tag for output in my plugin, I receive the error while trying to pass AU validation:

# # AudioChannelLayouts (1), Output Scope:

ChannelLayout is Writable: T

The Unit publishes the following Channel Layouts:

0x0 (Use_Channel_Descriptions)

Is Audio Channel Layout Available:

Mono Stereo Binau. AU_4 Ambi. AU_5 AU_5_0 AU_6 AU_6_0 AU_7_0 AU_7_0F AU_8 AU_5_1 AU_6_1 AU_7_1 AU_7_1F

X X X X X X X X X X X X X X X X

ERROR: Mismatch between reported channel layouts and reported numChannels

(*please see the full report at the end of this message)

When I use the “regular” layout tag (like kAudioChannelLayoutTag_MPEG_7_1_C) for my plugin output, it's passing AU validation successfully.

In fact, I need kAudioChannelLayoutTag_MPEG_7_1_C instead of kAudioChannelLayoutTag_UseChannelDescriptions, but I can’t use this tag because I need it will be supported by Logic and Logic currently doesn’t support kAudioChannelLayoutTag_MPEG_7_1_C. (kAudioChannelLayoutTag_MPEG_7_1_A and kAudioChannelLayoutTag_MPEG_7_1_B supported only)

How can I avoid this validation error with kAudioChannelLayoutTag_UseChannelDescriptions used?

When can I read information about the kAudioChannelLayoutTag_UseChannelDescriptions implementation and the error above? (or, no less importance, to see implementation examples?)

I tried to search (internet/SDK’s/…) some info about all above but can’t find anything really helps.

Any explanations/instructions/help will be highly appreciated.

Please advise.

Thank you,

Alexander.

* My System:

Mac Pro, OS X 10.9.5 Mavericks.

CoreAudio 4.2.1

** AU validation fail log:

--------------------------------------------------

FORMAT TESTS:

Reported Channel Capabilities (explicit):

[2, 8]

Input/Output Channel Handling:

1-1 1-2 1-4 1-5 1-6 1-7 1-8 2-2 2-4 2-5 2-6 2-7 2-8 4-4 4-5 5-5 6-6 7-7 8-8

ca_require: IsStreamFormatWritable(inScope, inElement) NotWritable /Volumes/Data/p4client_Mavericks/ProAudio/SDKs/CoreAudio/1.1/AudioUnits/AUPublic/AUBase/AUBase.cpp:871

# # AudioChannelLayouts (3), Input Scope:

ChannelLayout is Writable: T

The Unit publishes the following Channel Layouts:

0x650002, 0x660002, 0x6A0002,

Is Audio Channel Layout Available:

Mono Stereo Binau. AU_4 Ambi. AU_5 AU_5_0 AU_6 AU_6_0 AU_7_0 AU_7_0F AU_8 AU_5_1 AU_6_1 AU_7_1 AU_7_1F

X X

Current Format:AudioStreamBasicDescription: 2 ch, 44100 Hz, 'lpcm' (0x00000029) 32-bit little-endian float, deinterleaved

Current Format Tag = 0x650002, New Format Tag = 0x650002, Successsful

Current Format:AudioStreamBasicDescription: 2 ch, 44100 Hz, 'lpcm' (0x00000029) 32-bit little-endian float, deinterleaved

Current Format Tag = 0x650002, New Format Tag = 0x6A0002, Successsful

# # AudioChannelLayouts (1), Output Scope:

ChannelLayout is Writable: T

The Unit publishes the following Channel Layouts:

0x0 (Use_Channel_Descriptions)

Is Audio Channel Layout Available:

Mono Stereo Binau. AU_4 Ambi. AU_5 AU_5_0 AU_6 AU_6_0 AU_7_0 AU_7_0F AU_8 AU_5_1 AU_6_1 AU_7_1 AU_7_1F

X X X X X X X X X X X X X X X X

ERROR: Mismatch between reported channel layouts and reported numChannels