audio policy: add support for ro.audio.media_deep_buffer

Bug: 17931716.
Change-Id: Ife170f20f5d02b71059fbd384bd29759fafee826

2 files changed, 13 insertions, 1 deletions

diff --git a/services/audiopolicy/AudioPolicyManager.cpp b/services/audiopolicy/AudioPolicyManager.cpp
index 536987a..e4d785c 100644
--- a/services/audiopolicy/AudioPolicyManager.cpp
+++ b/services/audiopolicy/AudioPolicyManager.cpp
@@ -926,6 +926,10 @@ audio_io_handle_t AudioPolicyManager::getOutputForDevice(
     if ((flags & AUDIO_OUTPUT_FLAG_HW_AV_SYNC) != 0) {
         flags = (audio_output_flags_t)(flags | AUDIO_OUTPUT_FLAG_DIRECT);
     }
+    if (mForceDeepBufferForMedia && (flags & AUDIO_OUTPUT_FLAG_DIRECT) == 0 &&
+            stream == AUDIO_STREAM_MUSIC) {
+        flags = (audio_output_flags_t)(flags | AUDIO_OUTPUT_FLAG_DEEP_BUFFER);
+    }
 
     sp<IOProfile> profile;
 
@@ -2653,8 +2657,14 @@ AudioPolicyManager::AudioPolicyManager(AudioPolicyClientInterface *clientInterfa
     mTotalEffectsCpuLoad(0), mTotalEffectsMemory(0),
     mA2dpSuspended(false),
     mSpeakerDrcEnabled(false), mNextUniqueId(1),
-    mAudioPortGeneration(1)
+    mAudioPortGeneration(1),
+    mForceDeepBufferForMedia(false)
 {
+    char propValue[PROPERTY_VALUE_MAX];
+    if (property_get("ro.audio.media_deep_buffer", propValue, "0")) {
+        mForceDeepBufferForMedia = atoi(propValue);
+    }
+
     mUidCached = getuid();
     mpClientInterface = clientInterface;
 
diff --git a/services/audiopolicy/AudioPolicyManager.h b/services/audiopolicy/AudioPolicyManager.h
index 0ea7b97..b57a295 100644
--- a/services/audiopolicy/AudioPolicyManager.h
+++ b/services/audiopolicy/AudioPolicyManager.h
@@ -806,6 +806,8 @@ protected:
         sp<AudioPatch> mCallTxPatch;
         sp<AudioPatch> mCallRxPatch;
 
+        bool mForceDeepBufferForMedia;
+
 #ifdef AUDIO_POLICY_TEST
         Mutex   mLock;
         Condition mWaitWorkCV;