commit 97350f9df7252c881f011a410fcd9e6d766d2bee
author Phil Burk <philburk@google.com> Fri Jul 21 15:59:44 2017 -0700
committer Phil Burk <philburk@google.com> Wed Aug 02 10:57:31 2017 -0700
tree fab6334a25607e03276648611584b8fc23b40463
parent eb1c0658e405e5b7e26f4b16761c5b1ce3f77d46

aaudio: improve accuracy of timestamps

Account for latency added by the AAudio service.
Fix input timestamps.

Bug: 37080396
Test: test_timestamps.cpp input_monitor.cpp
Change-Id: I1053cd21af722bb9b9371df4e5731bf4a0a57b0b

media/libaaudio/src/binding/AAudioServiceMessage.h

diff --git a/media/libaaudio/src/binding/AAudioServiceMessage.h b/media/libaaudio/src/binding/AAudioServiceMessage.h
index b4377fb..54e8001 100644
--- a/media/libaaudio/src/binding/AAudioServiceMessage.h
+++ b/media/libaaudio/src/binding/AAudioServiceMessage.h
@@ -28,7 +28,6 @@
 // Used to send information about the HAL to the client.
 struct AAudioMessageTimestamp {
     int64_t position;     // number of frames transferred so far
-    int64_t deviceOffset; // add to client position to get device position
     int64_t timestamp;    // time when that position was reached
 };
 
@@ -51,7 +50,8 @@
 typedef struct AAudioServiceMessage_s {
     enum class code : uint32_t {
         NOTHING,
-        TIMESTAMP,
+        TIMESTAMP_SERVICE, // when frame is read or written by the service to the client
+        TIMESTAMP_HARDWARE, // when frame is at DAC or ADC
         EVENT,
     };