Merge "Speed up SniffMidi() by parsing the initial bytes of the header" into main am: 92949994fc

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/3286814

Change-Id: I3177642dc0bd3d32dce4b6ba06f2dd6a1103cc88
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>