policy_hal: fix for volume burst during FM device switch

- Issue: Volume burst is heard during device switch
  (headphone and speaker) for FM playback
- Root cause: delayMs passed to CheckAndSetVolume is
  not applied for FM playback
- Fix: Double delayMs and apply FM volume with this delay

Change-Id: Ifa0b214d16527973277a5c84b8a4f3fbd0760d07

1 files changed, 2 insertions, 1 deletions

diff --git a/policy_hal/AudioPolicyManager.cpp b/policy_hal/AudioPolicyManager.cpp
index 440d1229..ac4436c7 100644
--- a/policy_hal/AudioPolicyManager.cpp
+++ b/policy_hal/AudioPolicyManager.cpp
@@ -995,7 +995,8 @@ status_t AudioPolicyManagerCustom::checkAndSetVolume(audio_stream_type_t stream,
             mPrevFMVolumeDb = volumeDb;
             AudioParameter param = AudioParameter();
             param.addFloat(String8("fm_volume"), Volume::DbToAmpl(volumeDb));
-            mpClientInterface->setParameters(mPrimaryOutput->mIoHandle, param.toString(), delayMs);
+            //Double delayMs to avoid sound burst while device switch.
+            mpClientInterface->setParameters(mPrimaryOutput->mIoHandle, param.toString(), delayMs*2);
         }
 #endif /* FM_POWER_OPT end */
     }