Added APIs for audio preprocessing

Added APIs to control pre processes applied on captured audio.
Those APIs are still hidden until reviewed by API council.

Three types of standard pre processes are supported:
- Automatic Gain Control (AGC) by AutomaticGainControl class
- Acoustic Echo Cancellation (AEC) by AcousticEchoCanceler class
- Noise Suppression (NS) by NoiseSuppressor class

A method is added to AudioEffect class to query audio pre processings
applied by default by the platform on a given AudioRecord session ID.

Change-Id: I0b9fceeb8c704dd06319c3b52b85c96fe871d51d

2 files changed, 40 insertions, 0 deletions

diff --git a/services/audioflinger/AudioPolicyService.cpp b/services/audioflinger/AudioPolicyService.cpp
index dd1e153..6d06d83 100644
--- a/services/audioflinger/AudioPolicyService.cpp
+++ b/services/audioflinger/AudioPolicyService.cpp
@@ -497,6 +497,43 @@ bool AudioPolicyService::isStreamActive(int stream, uint32_t inPastMs) const
     return mpAudioPolicy->is_stream_active(mpAudioPolicy, stream, inPastMs);
 }
 
+status_t AudioPolicyService::queryDefaultPreProcessing(int audioSession,
+                                                       effect_descriptor_t *descriptors,
+                                                       uint32_t *count)
+{
+
+    if (mpAudioPolicy == NULL) {
+        *count = 0;
+        return NO_INIT;
+    }
+    Mutex::Autolock _l(mLock);
+    status_t status = NO_ERROR;
+
+    size_t index;
+    for (index = 0; index < mInputs.size(); index++) {
+        if (mInputs.valueAt(index)->mSessionId == audioSession) {
+            break;
+        }
+    }
+    if (index == mInputs.size()) {
+        *count = 0;
+        return BAD_VALUE;
+    }
+    Vector< sp<AudioEffect> > effects = mInputs.valueAt(index)->mEffects;
+
+    for (size_t i = 0; i < effects.size(); i++) {
+        effect_descriptor_t desc = effects[i]->descriptor();
+        if (i < *count) {
+            memcpy(descriptors + i, &desc, sizeof(effect_descriptor_t));
+        }
+    }
+    if (effects.size() > *count) {
+        status = NO_MEMORY;
+    }
+    *count = effects.size();
+    return status;
+}
+
 void AudioPolicyService::binderDied(const wp<IBinder>& who) {
     LOGW("binderDied() %p, tid %d, calling tid %d", who.unsafe_get(), gettid(),
             IPCThreadState::self()->getCallingPid());
diff --git a/services/audioflinger/AudioPolicyService.h b/services/audioflinger/AudioPolicyService.h
index 62ad29e..834b794 100644
--- a/services/audioflinger/AudioPolicyService.h
+++ b/services/audioflinger/AudioPolicyService.h
@@ -104,6 +104,9 @@ public:
     virtual status_t unregisterEffect(int id);
     virtual bool isStreamActive(int stream, uint32_t inPastMs = 0) const;
 
+    virtual status_t queryDefaultPreProcessing(int audioSession,
+                                              effect_descriptor_t *descriptors,
+                                              uint32_t *count);
     virtual     status_t    onTransact(
                                 uint32_t code,
                                 const Parcel& data,