diff --git a/include/media/AudioSystem.h b/include/media/AudioSystem.h
index da4645a..49e1afc 100644
--- a/include/media/AudioSystem.h
+++ b/include/media/AudioSystem.h
@@ -70,6 +70,8 @@
     // returns true in *state if tracks are active on the specified stream or has been active
     // in the past inPastMs milliseconds
     static status_t isStreamActive(audio_stream_type_t stream, bool *state, uint32_t inPastMs = 0);
+    // returns true in *state if a recorder is currently recording with the specified source
+    static status_t isSourceActive(audio_source_t source, bool *state);
 
     // set/get audio hardware parameters. The function accepts a list of parameters
     // key value pairs in the form: key1=value1;key2=value2;...
diff --git a/include/media/IAudioPolicyService.h b/include/media/IAudioPolicyService.h
index fb556af..cc2e069 100644
--- a/include/media/IAudioPolicyService.h
+++ b/include/media/IAudioPolicyService.h
@@ -88,6 +88,7 @@
     virtual status_t unregisterEffect(int id) = 0;
     virtual status_t setEffectEnabled(int id, bool enabled) = 0;
     virtual bool     isStreamActive(audio_stream_type_t stream, uint32_t inPastMs = 0) const = 0;
+    virtual bool     isSourceActive(audio_source_t source) const = 0;
     virtual status_t queryDefaultPreProcessing(int audioSession,
                                               effect_descriptor_t *descriptors,
                                               uint32_t *count) = 0;
diff --git a/media/libmedia/AudioSystem.cpp b/media/libmedia/AudioSystem.cpp
index 5624df4..207f96f 100644
--- a/media/libmedia/AudioSystem.cpp
+++ b/media/libmedia/AudioSystem.cpp
@@ -735,6 +735,15 @@
     return NO_ERROR;
 }
 
+status_t AudioSystem::isSourceActive(audio_source_t stream, bool* state)
+{
+    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
+    if (aps == 0) return PERMISSION_DENIED;
+    if (state == NULL) return BAD_VALUE;
+    *state = aps->isSourceActive(stream);
+    return NO_ERROR;
+}
+
 int32_t AudioSystem::getPrimaryOutputSamplingRate()
 {
     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
diff --git a/media/libmedia/IAudioPolicyService.cpp b/media/libmedia/IAudioPolicyService.cpp
index 31c5d27..401437c 100644
--- a/media/libmedia/IAudioPolicyService.cpp
+++ b/media/libmedia/IAudioPolicyService.cpp
@@ -52,6 +52,7 @@
     REGISTER_EFFECT,
     UNREGISTER_EFFECT,
     IS_STREAM_ACTIVE,
+    IS_SOURCE_ACTIVE,
     GET_DEVICES_FOR_STREAM,
     QUERY_DEFAULT_PRE_PROCESSING,
     SET_EFFECT_ENABLED
@@ -329,6 +330,15 @@
         return reply.readInt32();
     }
 
+    virtual bool isSourceActive(audio_source_t source) const
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IAudioPolicyService::getInterfaceDescriptor());
+        data.writeInt32((int32_t) source);
+        remote()->transact(IS_SOURCE_ACTIVE, data, &reply);
+        return reply.readInt32();
+    }
+
     virtual status_t queryDefaultPreProcessing(int audioSession,
                                                effect_descriptor_t *descriptors,
                                                uint32_t *count)
@@ -592,6 +602,13 @@
             return NO_ERROR;
         } break;
 
+        case IS_SOURCE_ACTIVE: {
+            CHECK_INTERFACE(IAudioPolicyService, data, reply);
+            audio_source_t source = (audio_source_t) data.readInt32();
+            reply->writeInt32( isSourceActive(source));
+            return NO_ERROR;
+        }
+
         case QUERY_DEFAULT_PRE_PROCESSING: {
             CHECK_INTERFACE(IAudioPolicyService, data, reply);
             int audioSession = data.readInt32();
diff --git a/services/audioflinger/AudioPolicyService.cpp b/services/audioflinger/AudioPolicyService.cpp
index 155a0b8..8b99bd2 100644
--- a/services/audioflinger/AudioPolicyService.cpp
+++ b/services/audioflinger/AudioPolicyService.cpp
@@ -483,6 +483,18 @@
     return mpAudioPolicy->is_stream_active(mpAudioPolicy, stream, inPastMs);
 }
 
+bool AudioPolicyService::isSourceActive(audio_source_t source) const
+{
+    if (mpAudioPolicy == NULL) {
+        return false;
+    }
+    if (mpAudioPolicy->is_source_active == 0) {
+        return false;
+    }
+    Mutex::Autolock _l(mLock);
+    return mpAudioPolicy->is_source_active(mpAudioPolicy, source);
+}
+
 status_t AudioPolicyService::queryDefaultPreProcessing(int audioSession,
                                                        effect_descriptor_t *descriptors,
                                                        uint32_t *count)
diff --git a/services/audioflinger/AudioPolicyService.h b/services/audioflinger/AudioPolicyService.h
index a086734..63f9549 100644
--- a/services/audioflinger/AudioPolicyService.h
+++ b/services/audioflinger/AudioPolicyService.h
@@ -104,6 +104,7 @@
     virtual status_t unregisterEffect(int id);
     virtual status_t setEffectEnabled(int id, bool enabled);
     virtual bool isStreamActive(audio_stream_type_t stream, uint32_t inPastMs = 0) const;
+    virtual bool isSourceActive(audio_source_t source) const;
 
     virtual status_t queryDefaultPreProcessing(int audioSession,
                                               effect_descriptor_t *descriptors,