AudioTrack: support ENCODING_IEC61937

Set DIRECT flag.
Use audio_has_proportional_frames() instead of audio_is_linear_pcm()
where appropriate.

Bug: 24541671
Bug: 20891646
Bug: 26373761
Change-Id: Ia32036b18683b084d6c9887593df87397ea0afd9
Signed-off-by: Phil Burk <philburk@google.com>
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index ec70ed4..a5b1e47 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -711,7 +711,7 @@
     sp<SwAudioOutputDescriptor> desc;
     if (mPolicyMixes.getOutputForAttr(attributes, desc) == NO_ERROR) {
         ALOG_ASSERT(desc != 0, "Invalid desc returned by getOutputForAttr");
-        if (!audio_is_linear_pcm(format)) {
+        if (!audio_has_proportional_frames(format)) {
             return BAD_VALUE;
         }
         *stream = streamTypefromAttributesInt(&attributes);