Fix race condition for non-started fast tracks

This required re-implementing how fast tracks are considered active.
Now, they use the same logic as normal tracks, except underrun is ignored.

Other changes:
 - add framesReady() to AudioBufferProvider interface
 - rebased
 - add track underrun counter state to fast mixer dump state
 - move dumpsys header to Track::appendDumpHeader()
   so it closer to where tracks are dumped
 - display track state in dumpsys as a character code
 - measure and display warmup time and cycles in dumpsys
 - copy in the presentation complete code
 - add ExtendedAudioBufferProvider for framesReady() which returns size_t
 - simplify underrun tracking
 - deferred reset track after stop()
 - add comments

Change-Id: I7db8821bc565230ec76da1f9380fe3fb09735e5b

1 files changed, 6 insertions, 0 deletions

diff --git a/services/audioflinger/SourceAudioBufferProvider.cpp b/services/audioflinger/SourceAudioBufferProvider.cpp
index e9e8c161..e9d6d2c7 100644
--- a/services/audioflinger/SourceAudioBufferProvider.cpp
+++ b/services/audioflinger/SourceAudioBufferProvider.cpp
@@ -95,4 +95,10 @@ void SourceAudioBufferProvider::releaseBuffer(Buffer *buffer)
     mGetCount = 0;
 }
 
+size_t SourceAudioBufferProvider::framesReady() const
+{
+    ssize_t avail = mSource->availableToRead();
+    return avail < 0 ? 0 : (size_t) avail;
+}
+
 }   // namespace android