commit c8f69a08a409fd163873d725c63f8d60259ae21d
author Phil Burk <philburk@google.com> Thu May 11 15:53:06 2017 -0700
committer Phil Burk <philburk@google.com> Tue May 16 10:34:05 2017 -0700
tree da3c5a871c2a78e109d02cf1c08cfb496d4aa3e6
parent feb0d87f693abd8fd2fa7ebfcdf7d91f0b95c131

aaudio: control MMAP mode using system properties

To facilitate testing of MMAP mode.

Bug: 38268547
Test: set properties, see framesPerBurst in write_sine_callback.cpp
Change-Id: I6e15c563215017f6a5020d89ac312ff8331afc4f
Signed-off-by: Phil Burk <philburk@google.com>

services/oboeservice/AAudioServiceEndpoint.cpp

diff --git a/services/oboeservice/AAudioServiceEndpoint.cpp b/services/oboeservice/AAudioServiceEndpoint.cpp
index d3e182a..a2e6d33 100644
--- a/services/oboeservice/AAudioServiceEndpoint.cpp
+++ b/services/oboeservice/AAudioServiceEndpoint.cpp
@@ -44,10 +44,6 @@
 // This is the maximum size in frames. The effective size can be tuned smaller at runtime.
 #define DEFAULT_BUFFER_CAPACITY   (48 * 8)
 
-// Use 2 for "double buffered"
-#define BUFFER_SIZE_IN_BURSTS     2
-#define BURSTS_PER_MIX_LOOP       1
-
 // The mStreamInternal will use a service interface that does not go through Binder.
 AAudioServiceEndpoint::AAudioServiceEndpoint(AAudioService &audioService)
         : mStreamInternal(audioService, true)
@@ -71,7 +67,13 @@
     if (result == AAUDIO_OK) {
         mMixer.allocate(mStreamInternal.getSamplesPerFrame(), mStreamInternal.getFramesPerBurst());
 
-        int32_t desiredBufferSize = BUFFER_SIZE_IN_BURSTS * mStreamInternal.getFramesPerBurst();
+        int32_t burstsPerBuffer = AAudioProperty_getMixerBursts();
+        if (burstsPerBuffer == 0) {
+            mLatencyTuningEnabled = true;
+            burstsPerBuffer = 2;
+        }
+        ALOGD("AAudioServiceEndpoint(): burstsPerBuffer = %d", burstsPerBuffer);
+        int32_t desiredBufferSize = burstsPerBuffer * mStreamInternal.getFramesPerBurst();
         mStreamInternal.setBufferSize(desiredBufferSize);
     }
     return result;
@@ -117,7 +119,6 @@
 
 static void *aaudio_mixer_thread_proc(void *context) {
     AAudioServiceEndpoint *stream = (AAudioServiceEndpoint *) context;
-    //LOGD("AudioStreamAAudio(): oboe_callback_thread, stream = %p", stream);
     if (stream != NULL) {
         return stream->callbackLoop();
     } else {