Add new API for plugin audio track latency.

This CL extends the existing udio API with a new function to
measure the latency of a audio track. To preserve binary
compatibility with the already released v0 API we have created
a v1 extension.

Change-Id: I656ac10470f2262bac7039aa45458d2100a37612
http://b/3088633

2 files changed, 19 insertions, 0 deletions

diff --git a/WebKit/android/plugins/ANPSoundInterface.cpp b/WebKit/android/plugins/ANPSoundInterface.cpp
index 8e31d69..91778e3 100644
--- a/WebKit/android/plugins/ANPSoundInterface.cpp
+++ b/WebKit/android/plugins/ANPSoundInterface.cpp
@@ -136,6 +136,10 @@ static bool ANPTrackIsStopped(ANPAudioTrack* track) {
     return track->mTrack->stopped();
 }
 
+static uint32_t ANPTrackLatency(ANPAudioTrack* track) {
+    return track->mTrack->latency();
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 void ANPAudioTrackInterfaceV0_Init(ANPInterface* value) {
@@ -147,3 +151,11 @@ void ANPAudioTrackInterfaceV0_Init(ANPInterface* value) {
     si->stop        = ANPTrackStop;
     si->isStopped   = ANPTrackIsStopped;
 }
+
+void ANPAudioTrackInterfaceV1_Init(ANPInterface* value) {
+    // initialize the functions from the previous interface
+    ANPAudioTrackInterfaceV0_Init(value);
+    // add any new functions or override existing functions
+    ANPAudioTrackInterfaceV1* si = reinterpret_cast<ANPAudioTrackInterfaceV1*>(value);
+    si->trackLatency = ANPTrackLatency;
+}
diff --git a/WebKit/android/plugins/android_npapi.h b/WebKit/android/plugins/android_npapi.h
index 25cee97..87ca8cc 100644
--- a/WebKit/android/plugins/android_npapi.h
+++ b/WebKit/android/plugins/android_npapi.h
@@ -120,6 +120,8 @@ typedef uint32_t ANPMatrixFlag;
 #define kSystemInterfaceV0_ANPGetValue      ((NPNVariable)1010)
 #define kEventInterfaceV0_ANPGetValue       ((NPNVariable)1011)
 
+#define kAudioTrackInterfaceV1_ANPGetValue  ((NPNVariable)1012)
+
 /** queries for the drawing models supported on this device.
 
     NPN_GetValue(inst, kSupportedDrawingModel_ANPGetValue, uint32_t* bits)
@@ -762,6 +764,11 @@ struct ANPAudioTrackInterfaceV0 : ANPInterface {
     bool (*isStopped)(ANPAudioTrack*);
 };
 
+struct ANPAudioTrackInterfaceV1 : ANPAudioTrackInterfaceV0 {
+    /** Returns the track's latency in milliseconds. */
+    uint32_t (*trackLatency)(ANPAudioTrack*);
+};
+
 ///////////////////////////////////////////////////////////////////////////////
 // DEFINITION OF VALUES PASSED THROUGH NPP_HandleEvent