commit b7d8c5aa7a9c182e695e456c4aea8f8f6c550850
author jiabin <jiabin@google.com> Wed Aug 26 17:24:52 2020 -0700
committer Jiabin Huang <jiabin@google.com> Wed Sep 23 21:45:29 2020 +0000
tree 8d602524e90bf46e4cbe1e33a71fa472e7998c34
parent 8dbd241e279e1a637502e38af32ef6ead483768f

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

services/audioflinger/Threads.h

diff --git a/services/audioflinger/Threads.h b/services/audioflinger/Threads.h
index d59b702..be92769 100644
--- a/services/audioflinger/Threads.h
+++ b/services/audioflinger/Threads.h
@@ -1824,6 +1824,7 @@
                    audio_port_handle_t *handle);
     status_t stop(audio_port_handle_t handle);
     status_t standby();
+    virtual status_t getExternalPosition(uint64_t *position, int64_t *timeNaos) = 0;
 
     // RefBase
     virtual     void        onFirstRef();
@@ -1935,6 +1936,8 @@
 
     virtual     void        toAudioPortConfig(struct audio_port_config *config);
 
+                status_t    getExternalPosition(uint64_t *position, int64_t *timeNanos) override;
+
 protected:
                 void        dumpInternals_l(int fd, const Vector<String16>& args) override;
 
@@ -1965,6 +1968,8 @@
 
     virtual     void           toAudioPortConfig(struct audio_port_config *config);
 
+                status_t       getExternalPosition(uint64_t *position, int64_t *timeNanos) override;
+
 protected:
 
                 AudioStreamIn*  mInput;