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Commit 6456a65a authored by Phil Burk's avatar Phil Burk
Browse files

UsbMidiDevice: add timestamps for input events 



This will improve the accuracy of recorded MIDI performances.

Bug: 22801515
Change-Id: Ib78bc929224f2f27938c83a815eaa62f6b5f9560
Signed-off-by: default avatarPhil Burk <philburk@google.com>
parent b83b5fa6

services/usb/java/com/android/server/usb/UsbMidiDevice.java

+5 −3
Original line number Diff line number Diff line
@@ -203,6 +203,8 @@ public final class UsbMidiDevice implements Closeable { 
                byte[] buffer = new byte[BUFFER_SIZE];

                try {

                    while (true) {

                        // Record time of event immediately after waking.

                        long timestamp = System.nanoTime();

                        synchronized (mLock) {

                            if (!mIsOpen) break;
@@ -222,7 +224,7 @@ public final class UsbMidiDevice implements Closeable { 
                                    }



                                    int count = mInputStreams[index].read(buffer);

                                    outputReceivers[index].send(buffer, 0, count);

                                    outputReceivers[index].send(buffer, 0, count, timestamp);

                                }

                            }

                        }