Define and use DRC-specific volume curves when applicable

Add support for property defining whether a DRC on the speaker path
 is enabled and will boost soft sounds.
Define new volume curves with more attenuations than existing ones
 to compensate for DRC-induced boost on sonification sounds to
 provide a more "linear" control to the user over the applied volume.

Bug 11600699

Change-Id: If23dd097a8b9b5ebb61e75dd8512ff75e63ba899

1 files changed, 35 insertions, 3 deletions

diff --git a/audio/AudioPolicyManagerBase.cpp b/audio/AudioPolicyManagerBase.cpp
index dbca8ff..65e732f 100644
--- a/audio/AudioPolicyManagerBase.cpp
+++ b/audio/AudioPolicyManagerBase.cpp
@@ -1532,7 +1532,8 @@ AudioPolicyManagerBase::AudioPolicyManagerBase(AudioPolicyClientInterface *clien
     mPhoneState(AudioSystem::MODE_NORMAL),
     mLimitRingtoneVolume(false), mLastVoiceVolume(-1.0f),
     mTotalEffectsCpuLoad(0), mTotalEffectsMemory(0),
-    mA2dpSuspended(false), mHasA2dp(false), mHasUsb(false), mHasRemoteSubmix(false)
+    mA2dpSuspended(false), mHasA2dp(false), mHasUsb(false), mHasRemoteSubmix(false),
+    mSpeakerDrcEnabled(false)
 {
     mpClientInterface = clientInterface;
 
@@ -1540,8 +1541,6 @@ AudioPolicyManagerBase::AudioPolicyManagerBase(AudioPolicyClientInterface *clien
         mForceUse[i] = AudioSystem::FORCE_NONE;
     }
 
-    initializeVolumeCurves();
-
     mA2dpDeviceAddress = String8("");
     mScoDeviceAddress = String8("");
     mUsbCardAndDevice = String8("");
@@ -1553,6 +1552,9 @@ AudioPolicyManagerBase::AudioPolicyManagerBase(AudioPolicyClientInterface *clien
         }
     }
 
+    // must be done after reading the policy
+    initializeVolumeCurves();
+
     // open all output streams needed to access attached devices
     for (size_t i = 0; i < mHwModules.size(); i++) {
         mHwModules[i]->mHandle = mpClientInterface->loadHwModule(mHwModules[i]->mName);
@@ -2874,6 +2876,11 @@ const AudioPolicyManagerBase::VolumeCurvePoint
     {1, -29.7f}, {33, -20.1f}, {66, -10.2f}, {100, 0.0f}
 };
 
+const AudioPolicyManagerBase::VolumeCurvePoint
+    AudioPolicyManagerBase::sSpeakerSonificationVolumeCurveDrc[AudioPolicyManagerBase::VOLCNT] = {
+    {1, -35.7f}, {33, -26.1f}, {66, -13.2f}, {100, 0.0f}
+};
+
 // AUDIO_STREAM_SYSTEM, AUDIO_STREAM_ENFORCED_AUDIBLE and AUDIO_STREAM_DTMF volume tracks
 // AUDIO_STREAM_RING on phones and AUDIO_STREAM_MUSIC on tablets.
 // AUDIO_STREAM_DTMF tracks AUDIO_STREAM_VOICE_CALL while in call (See AudioService.java).
@@ -2885,6 +2892,11 @@ const AudioPolicyManagerBase::VolumeCurvePoint
 };
 
 const AudioPolicyManagerBase::VolumeCurvePoint
+    AudioPolicyManagerBase::sDefaultSystemVolumeCurveDrc[AudioPolicyManagerBase::VOLCNT] = {
+    {1, -34.0f}, {33, -24.0f}, {66, -15.0f}, {100, -6.0f}
+};
+
+const AudioPolicyManagerBase::VolumeCurvePoint
     AudioPolicyManagerBase::sHeadsetSystemVolumeCurve[AudioPolicyManagerBase::VOLCNT] = {
     {1, -30.0f}, {33, -26.0f}, {66, -22.0f}, {100, -18.0f}
 };
@@ -2962,6 +2974,18 @@ void AudioPolicyManagerBase::initializeVolumeCurves()
                     sVolumeProfiles[i][j];
         }
     }
+
+    // Check availability of DRC on speaker path: if available, override some of the speaker curves
+    if (mSpeakerDrcEnabled) {
+        mStreams[AUDIO_STREAM_SYSTEM].mVolumeCurve[DEVICE_CATEGORY_SPEAKER] =
+                sDefaultSystemVolumeCurveDrc;
+        mStreams[AUDIO_STREAM_RING].mVolumeCurve[DEVICE_CATEGORY_SPEAKER] =
+                sSpeakerSonificationVolumeCurveDrc;
+        mStreams[AUDIO_STREAM_ALARM].mVolumeCurve[DEVICE_CATEGORY_SPEAKER] =
+                sSpeakerSonificationVolumeCurveDrc;
+        mStreams[AUDIO_STREAM_NOTIFICATION].mVolumeCurve[DEVICE_CATEGORY_SPEAKER] =
+                sSpeakerSonificationVolumeCurveDrc;
+    }
 }
 
 float AudioPolicyManagerBase::computeVolume(int stream,
@@ -3688,6 +3712,11 @@ uint32_t AudioPolicyManagerBase::stringToEnum(const struct StringToEnum *table,
     return 0;
 }
 
+bool AudioPolicyManagerBase::stringToBool(const char *value)
+{
+    return ((strcasecmp("true", value) == 0) || (strcmp("1", value) == 0));
+}
+
 audio_output_flags_t AudioPolicyManagerBase::parseFlagNames(char *name)
 {
     uint32_t flag = 0;
@@ -3993,6 +4022,9 @@ void AudioPolicyManagerBase::loadGlobalConfig(cnode *root)
         } else if (strcmp(ATTACHED_INPUT_DEVICES_TAG, node->name) == 0) {
             mAvailableInputDevices = parseDeviceNames((char *)node->value) & ~AUDIO_DEVICE_BIT_IN;
             ALOGV("loadGlobalConfig() mAvailableInputDevices %04x", mAvailableInputDevices);
+        } else if (strcmp(SPEAKER_DRC_ENABLED_TAG, node->name) == 0) {
+            mSpeakerDrcEnabled = stringToBool((char *)node->value);
+            ALOGV("loadGlobalConfig() mSpeakerDrcEnabled = %d", mSpeakerDrcEnabled);
         }
         node = node->next;
     }