Add getExternalPosition in MMapStreamInterface.
GetExternalPosition will return a recent count of the number of
audio frames presented/received to/from an external observer. Using
the new API can return a precise timestamp to client, which can
help on A/V sync.
Test: atest AAudioTests
Bug: 158609200
Change-Id: If74e1d859a2bb2b4dba6af0e4e9164f05d19d962
diff --git a/services/oboeservice/AAudioServiceEndpointMMAP.cpp b/services/oboeservice/AAudioServiceEndpointMMAP.cpp
index 04c6453..5bccfd5 100644
--- a/services/oboeservice/AAudioServiceEndpointMMAP.cpp
+++ b/services/oboeservice/AAudioServiceEndpointMMAP.cpp
@@ -378,3 +378,18 @@
parcelable.mDownDataQueueParcelable.setCapacityInFrames(getBufferCapacity());
return AAUDIO_OK;
}
+
+aaudio_result_t AAudioServiceEndpointMMAP::getExternalPosition(uint64_t *positionFrames,
+ int64_t *timeNanos)
+{
+ if (!mExternalPositionSupported) {
+ return AAUDIO_ERROR_INVALID_STATE;
+ }
+ status_t status = mMmapStream->getExternalPosition(positionFrames, timeNanos);
+ if (status == INVALID_OPERATION) {
+ // getExternalPosition is not supported. Set mExternalPositionSupported as false
+ // so that the call will not go to the HAL next time.
+ mExternalPositionSupported = false;
+ }
+ return AAudioConvert_androidToAAudioResult(status);
+}