objc2_audio_toolbox

Function AudioFileComponentCountUserData

Source 
pub unsafe extern "C-unwind" fn AudioFileComponentCountUserData(
    in_component: AudioFileComponent,
    in_user_data_id: u32,
    out_number_items: NonNull<u32>,
) -> i32
Available on crate feature AudioComponent only.
Expand description

implements AudioFileCountUserData

“User Data” refers to chunks in AIFF, CAF and WAVE files, or resources in Sound Designer II files, and possibly other things in other files. For simplicity, referred to below as “chunks”.

Parameter inComponent: an AudioFileComponent

Parameter inUserDataID: the four char code of the chunk.

Parameter outNumberItems: on output, if successful, number of chunks of this type in the file.

Returns: returns noErr if successful.