ios - Why can't I change the number of elements / buses in the input scope of AU multi channel mixer? -


update: i'm changing code illustrate issue in more streamlined way. had little bug which, while not deterring problem, did add confusion.

i'm instantiating multi channel mixer au in ios (kaudiounitsubtype_multichannelmixer) , following:

osstatus status = noerr;  //  set component type: audiocomponentdescription cd = {0}; cd.componenttype = kaudiounittype_mixer; cd.componentsubtype = kaudiounitsubtype_multichannelmixer; cd.componentmanufacturer = kaudiounitmanufacturer_apple;  //  alloc unit: audiocomponent defaultoutput = audiocomponentfindnext(null, &cd); audiounit mixer; status = audiocomponentinstancenew(defaultoutput, &mixer); nslog(@"au init status: %li", status);   //  can try initializing unit before or after attempt set input bus count. //  doesn't matter; won't work either way. audiounitinitialize(mixer);  //  number of inputs uint32 bussize = sizeof(uint32); uint32 buscount = 0; status = audiounitgetproperty(mixer,                               kaudiounitproperty_elementcount,                               kaudiounitscope_input,                               0,                               &buscount,                               &bussize); nslog(@"au input bus count | status: %li | count: %lu", status, buscount);   //  try setting number of inputs buscount = 3; status = audiounitsetproperty(mixer,                               kaudiounitproperty_elementcount,                               kaudiounitscope_input,                               0,                               &buscount,                               bussize);  nslog(@"au set input status: %li", status);  //  number of inputs buscount = 0; status = audiounitgetproperty(mixer,                               kaudiounitproperty_elementcount,                               kaudiounitscope_input,                               0,                               &buscount,                               &bussize);  nslog(@"au input bus count | status: %li | count: %lu", status, buscount);   //  try setting number of inputs buscount = 10; status = audiounitsetproperty(mixer,                               kaudiounitproperty_elementcount,                               kaudiounitscope_input,                               0,                               &buscount,                               bussize);  nslog(@"au set input status: %li", status);  //  number of inputs buscount = 0; status = audiounitgetproperty(mixer,                               kaudiounitproperty_elementcount,                               kaudiounitscope_input,                               0,                               &buscount,                               &bussize);  nslog(@"au input bus count | status: %li | count: %lu", status, buscount);

and following output:

2013-10-11 19:54:32.248 aumultichannelradar[3996:a0b] au init status: 0 2013-10-11 19:54:32.249 aumultichannelradar[3996:a0b] au input bus count | status: 0 | count: 8 2013-10-11 19:54:32.250 aumultichannelradar[3996:a0b] au set input status: 0 2013-10-11 19:54:32.250 aumultichannelradar[3996:a0b] au input bus count | status: 0 | count: 8 2013-10-11 19:54:32.250 aumultichannelradar[3996:a0b] au set input status: 0 2013-10-11 19:54:32.251 aumultichannelradar[3996:a0b] au input bus count | status: 0 | count: 10

i'd expect bus count not 8 default (since audio unit documentation doesn't there default value on instantiation) , i'd expect able change number of input elements both less , more 8 matter (since docs can have "any" number of inputs). however, output, attempting set input count less 8 nothing; can set more 8.

i talked apple engineer part of coreaudio team , showed him code , agreed bug. tried out himself , got same results me: unit seems instantiated 8 inputs default , can set number more 8 not less (yes, code showed 2 inputs cause messing , dividing 8/4 -- thanks).

he told me file radar did. # 15214291.


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