Report underruns for fast tracks also

This fixes a regression that was introduced earlier
by commit 9f80dd223d83d9bb9077fb6baee056cee4eaf7e5
called "New control block for AudioTrack and AudioRecord".
That commit broke underrun reporting for fast tracks.

Also remove Track::mUnderrunCount, which counted the number of underrun
events, and was only used by dumpsys media.audio_flinger.

Now dumpsys media.audio_flinger reports the number of underrun frames,

Isolated underrun-related control block accesses via the proxy, so that
the server is not directly poking around in the control block.

The new proxy APIs are AudioTrackServerProxy::getUnderrunFrames() and
AudioTrackServerProxy::tallyUnderrunFrames().  getUnderrunFrames() returns
a rolling counter for streaming tracks, or zero for static buffer tracks
which never underrun, but do a kind of 'pause' at end of buffer.
tallyUnderrunFrames() increments the counter by a specified number of frames.

Change-Id: Ib31fd73eb17cbb23888ce3af8ff29f471f5bd5a2

1 files changed, 19 insertions, 0 deletions

diff --git a/media/libmedia/AudioTrackShared.cpp b/media/libmedia/AudioTrackShared.cpp
index 3b7616f..e7abb40 100644
--- a/media/libmedia/AudioTrackShared.cpp
+++ b/media/libmedia/AudioTrackShared.cpp
@@ -661,6 +661,14 @@ bool  AudioTrackServerProxy::setStreamEndDone() {
     return old;
 }
 
+void AudioTrackServerProxy::tallyUnderrunFrames(uint32_t frameCount)
+{
+    mCblk->u.mStreaming.mUnderrunFrames += frameCount;
+
+    // FIXME also wake futex so that underrun is noticed more quickly
+    (void) android_atomic_or(CBLK_UNDERRUN, &mCblk->mFlags);
+}
+
 // ---------------------------------------------------------------------------
 
 StaticAudioTrackServerProxy::StaticAudioTrackServerProxy(audio_track_cblk_t* cblk, void *buffers,
@@ -817,6 +825,17 @@ void StaticAudioTrackServerProxy::releaseBuffer(Buffer* buffer)
     buffer->mNonContig = 0;
 }
 
+void StaticAudioTrackServerProxy::tallyUnderrunFrames(uint32_t frameCount)
+{
+    // Unlike AudioTrackServerProxy::tallyUnderrunFrames() used for streaming tracks,
+    // we don't have a location to count underrun frames.  The underrun frame counter
+    // only exists in AudioTrackSharedStreaming.  Fortunately, underruns are not
+    // possible for static buffer tracks other than at end of buffer, so this is not a loss.
+
+    // FIXME also wake futex so that underrun is noticed more quickly
+    (void) android_atomic_or(CBLK_UNDERRUN, &mCblk->mFlags);
+}
+
 // ---------------------------------------------------------------------------
 
 }   // namespace android