Add an implementation of get_next_write_timestamp.

Add a default implementation of get_next_write_timestamp to the C <--> C++
legacy audio HAL implementation allowing HALs using the legacy C++
AudioStreamOut to overload and implement get_next_write_timestamp.  Default
implementation returns INVALID_OPERATION to indicate that the functionality is
not supported.

Change-Id: I087347649e9ba186a74cb34aaadf989bf90720fe

1 files changed, 7 insertions, 0 deletions

diff --git a/audio/AudioHardwareInterface.cpp b/audio/AudioHardwareInterface.cpp
index 4997a6a..c116669 100644
--- a/audio/AudioHardwareInterface.cpp
+++ b/audio/AudioHardwareInterface.cpp
@@ -73,6 +73,12 @@ AudioStreamOut::~AudioStreamOut()
 {
 }
 
+// default implementation is unsupported
+status_t AudioStreamOut::getNextWriteTimestamp(int64_t *timestamp)
+{
+    return INVALID_OPERATION;
+}
+
 AudioStreamIn::~AudioStreamIn() {}
 
 AudioHardwareBase::AudioHardwareBase()
@@ -125,6 +131,7 @@ size_t AudioHardwareBase::getInputBufferSize(uint32_t sampleRate, int format, in
     return 320;
 }
 
+// default implementation is unsupported
 status_t AudioHardwareBase::getMasterVolume(float *volume)
 {
     return INVALID_OPERATION;