MultiAccessunitHelper: samplerate and channelCount

The sample rates and channel count should be quieried at the output
rather than at the input. This will make sure that the codec
reports values in the current stream.

Test: atest android.mediav2.cts.CodecDecoderMultiAccessUnitTest
Test: atest android.mediav2.cts.CodecDecoderBlockModelMultiAccessUnitTest
Bug: 325512893
Change-Id: I88c2b778998ed91faca9d3664400e1e9c2ac2fa5
2 files changed