AudioManager: add audio port gain control

Implement AudioManager.setAudioPortGain() API.

Bug: 14815883.

Change-Id: Ib54bd1fd1392c474f4767a00228b0a617c51ec5e

3 files changed, 12 insertions, 1 deletions

diff --git a/media/java/android/media/AudioManager.java b/media/java/android/media/AudioManager.java
index e6988b6..2f8a17b 100644
--- a/media/java/android/media/AudioManager.java
+++ b/media/java/android/media/AudioManager.java
@@ -3087,7 +3087,14 @@ public class AudioManager {
      * @hide
      */
     public int setAudioPortGain(AudioPort port, AudioGainConfig gain) {
-        return ERROR_INVALID_OPERATION;
+        if (port == null || gain == null) {
+            return ERROR_BAD_VALUE;
+        }
+        AudioPortConfig activeConfig = port.activeConfig();
+        AudioPortConfig config = new AudioPortConfig(port, activeConfig.samplingRate(),
+                                        activeConfig.channelMask(), activeConfig.format(), gain);
+        config.mConfigMask = AudioPortConfig.GAIN;
+        return AudioSystem.setAudioPortConfig(config);
     }
 
     /**
diff --git a/media/java/android/media/AudioPort.java b/media/java/android/media/AudioPort.java
index 9aeddef..fbd5022 100644
--- a/media/java/android/media/AudioPort.java
+++ b/media/java/android/media/AudioPort.java
@@ -133,6 +133,9 @@ public class AudioPort {
      * Get the gain descriptor at a given index
      */
     AudioGain gain(int index) {
+        if (index < mGains.length) {
+            return null;
+        }
         return mGains[index];
     }
 
diff --git a/media/java/android/media/AudioSystem.java b/media/java/android/media/AudioSystem.java
index 47a884b..af7a3e1 100644
--- a/media/java/android/media/AudioSystem.java
+++ b/media/java/android/media/AudioSystem.java
@@ -465,5 +465,6 @@ public class AudioSystem
                                             AudioPortConfig[] sources, AudioPortConfig[] sinks);
     public static native int releaseAudioPatch(AudioPatch patch);
     public static native int listAudioPatches(ArrayList<AudioPatch> patches, int[] generation);
+    public static native int setAudioPortConfig(AudioPortConfig config);
 }