commit 87c9f646a94259d7c321c3b3d5947fa1778f5ac2
author Phil Burk <philburk@google.com> Wed May 17 07:22:39 2017 -0700
committer Phil Burk <philburk@google.com> Wed May 24 15:44:23 2017 -0700
tree 89c57e19157557b2cb5d7aca7bc1371e530f734c
parent da6b9eafb5de2434717aea264ad61b025bc4fe7f

aaudio: lower latency using MMAP capture

MMAP can be enabled by setting system properties.

Bug: 38267780
Test: input_monitor.cpp
Change-Id: I5e86fd1d9baef4fe59837ccbca7971acbb54d8b5
Signed-off-by: Phil Burk <philburk@google.com>

media/libaaudio/src/client/AudioEndpoint.h

diff --git a/media/libaaudio/src/client/AudioEndpoint.h b/media/libaaudio/src/client/AudioEndpoint.h
index 3a2099f..53ba033 100644
--- a/media/libaaudio/src/client/AudioEndpoint.h
+++ b/media/libaaudio/src/client/AudioEndpoint.h
@@ -54,29 +54,36 @@
      */
     aaudio_result_t writeDataNow(const void *buffer, int32_t numFrames);
 
-    void getEmptyRoomAvailable(android::WrappingBuffer *wrappingBuffer);
+    void getEmptyFramesAvailable(android::WrappingBuffer *wrappingBuffer);
 
     int32_t getEmptyFramesAvailable();
+
+    void getFullFramesAvailable(android::WrappingBuffer *wrappingBuffer);
+
     int32_t getFullFramesAvailable();
 
+    void advanceReadIndex(int32_t deltaFrames);
+
     void advanceWriteIndex(int32_t deltaFrames);
 
     /**
      * Set the read index in the downData queue.
      * This is needed if the reader is not updating the index itself.
      */
-    void setDownDataReadCounter(android::fifo_counter_t framesRead);
-    android::fifo_counter_t getDownDataReadCounter();
+    void setDataReadCounter(android::fifo_counter_t framesRead);
 
-    void setDownDataWriteCounter(android::fifo_counter_t framesWritten);
-    android::fifo_counter_t getDownDataWriteCounter();
+    android::fifo_counter_t getDataReadCounter();
+
+    void setDataWriteCounter(android::fifo_counter_t framesWritten);
+
+    android::fifo_counter_t getDataWriteCounter();
 
     /**
      * The result is not valid until after configure() is called.
      *
      * @return true if the output buffer read position is not updated, eg. DMA
      */
-    bool isOutputFreeRunning() const { return mOutputFreeRunning; }
+    bool isFreeRunning() const { return mFreeRunning; }
 
     int32_t setBufferSizeInFrames(int32_t requestedFrames,
                                   int32_t *actualFrames);
@@ -86,8 +93,8 @@
 
 private:
     android::FifoBuffer    *mUpCommandQueue;
-    android::FifoBuffer    *mDownDataQueue;
-    bool                    mOutputFreeRunning;
+    android::FifoBuffer    *mDataQueue;
+    bool                    mFreeRunning;
     android::fifo_counter_t mDataReadCounter; // only used if free-running
     android::fifo_counter_t mDataWriteCounter; // only used if free-running
 };