Use Format_isValid() and Format_isEqual() instead of direct comparison

Change-Id: Ie87607aa514976947540a77775e6425c4e56e7d9
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index f9cc17b..039a0d8 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -1783,7 +1783,7 @@
                                         popcount(inStream->common.get_channels(&inStream->common)));
         if (!mTeeSinkInputEnabled) {
             kind = TEE_SINK_NO;
-        } else if (format == Format_Invalid) {
+        } else if (!Format_isValid(format)) {
             kind = TEE_SINK_NO;
         } else if (mRecordTeeSink == 0) {
             kind = TEE_SINK_NEW;
diff --git a/services/audioflinger/FastMixer.cpp b/services/audioflinger/FastMixer.cpp
index 7126e92..28b9d77 100644
--- a/services/audioflinger/FastMixer.cpp
+++ b/services/audioflinger/FastMixer.cpp
@@ -239,7 +239,7 @@
                 dumpState->mSampleRate = sampleRate;
             }
 
-            if ((format != previousFormat) || (frameCount != previous->mFrameCount)) {
+            if ((!Format_isEqual(format, previousFormat)) || (frameCount != previous->mFrameCount)) {
                 // FIXME to avoid priority inversion, don't delete here
                 delete mixer;
                 mixer = NULL;
diff --git a/services/audioflinger/Tracks.cpp b/services/audioflinger/Tracks.cpp
index d8d7790..19e715a 100644
--- a/services/audioflinger/Tracks.cpp
+++ b/services/audioflinger/Tracks.cpp
@@ -146,7 +146,7 @@
 #ifdef TEE_SINK
         if (mTeeSinkTrackEnabled) {
             NBAIO_Format pipeFormat = Format_from_SR_C(mSampleRate, mChannelCount);
-            if (pipeFormat != Format_Invalid) {
+            if (Format_isValid(pipeFormat)) {
                 Pipe *pipe = new Pipe(mTeeSinkTrackFrames, pipeFormat);
                 size_t numCounterOffers = 0;
                 const NBAIO_Format offers[1] = {pipeFormat};