Gallery2: support stereo/single track play mode

(cherry picked new files from commit id
990c6d43ea7c184846e19d41bef0d93aee4e581b)

Change-Id: I2d7d523ca586a031c3fb139eda321d5073b30589

3 files changed, 118 insertions, 0 deletions

diff --git a/res/drawable-mdpi/ic_menu_single_track.png b/res/drawable-mdpi/ic_menu_single_track.png
new file mode 100755
index 000000000..b11c2e434
--- /dev/null
+++ b/res/drawable-mdpi/ic_menu_single_track.png
diff --git a/res/drawable-mdpi/ic_menu_stereo.png b/res/drawable-mdpi/ic_menu_stereo.png
new file mode 100755
index 000000000..ef3ee9fe3
--- /dev/null
+++ b/res/drawable-mdpi/ic_menu_stereo.png
diff --git a/src/com/qcom/gallery3d/video/StereoAudioHooker.java b/src/com/qcom/gallery3d/video/StereoAudioHooker.java
new file mode 100755
index 000000000..72f3cb255
--- /dev/null
+++ b/src/com/qcom/gallery3d/video/StereoAudioHooker.java
@@ -0,0 +1,118 @@
+package com.qcom.gallery3d.video;
+
+import android.content.Context;
+import android.media.AudioManager;
+import android.view.Menu;
+import android.view.MenuItem;
+
+import com.android.gallery3d.R;
+import com.qcom.gallery3d.ext.QcomLog;
+
+public class StereoAudioHooker extends MovieHooker {
+    private static final String TAG = "StereoAudioHooker";
+    private static final boolean LOG = true;
+    
+    private static final int MENU_STEREO_AUDIO = 1;
+    private MenuItem mMenuStereoAudio;
+    
+    private static final String KEY_STEREO = "EnableStereoOutput";
+    private boolean mSystemStereoAudio;
+    private boolean mCurrentStereoAudio;
+    private boolean mIsInitedStereoAudio;
+    private AudioManager mAudioManager;
+    
+    @Override
+    public void onStart() {
+        super.onStart();
+        enableStereoAudio();
+    }
+    @Override
+    public void onStop() {
+        super.onStop();
+        restoreStereoAudio();
+    }
+    @Override
+    public boolean onCreateOptionsMenu(final Menu menu) {
+        super.onCreateOptionsMenu(menu);
+        mMenuStereoAudio = menu.add(0, getMenuActivityId(MENU_STEREO_AUDIO), 0, R.string.single_track);
+        return true;
+    }
+    @Override
+    public boolean onPrepareOptionsMenu(final Menu menu) {
+        super.onPrepareOptionsMenu(menu);
+        updateStereoAudioIcon();
+        return true;
+    }
+    @Override
+    public boolean onOptionsItemSelected(final MenuItem item) {
+        super.onOptionsItemSelected(item);
+        switch(getMenuOriginalId(item.getItemId())) {
+        case MENU_STEREO_AUDIO:
+            mCurrentStereoAudio = !mCurrentStereoAudio;
+            setStereoAudio(mCurrentStereoAudio);
+            return true;
+        default:
+            return false;
+        }
+    }
+    
+    private boolean getStereoAudio() {
+        boolean isstereo = false;
+        if (mAudioManager == null) {
+            mAudioManager = (AudioManager)getContext().getSystemService(Context.AUDIO_SERVICE);
+        }
+        final String stereo = mAudioManager.getParameters(KEY_STEREO);
+        final String key = KEY_STEREO + "=1";
+        if (stereo != null && stereo.indexOf(key) > -1) {
+            isstereo = true;
+        } else {
+            isstereo = false;
+        }
+        if (LOG) {
+            QcomLog.v(TAG, "getStereoAudio() isstereo=" + isstereo + ", stereo=" + stereo + ", key=" + key);
+        }
+        return isstereo;
+    }
+    
+    private void setStereoAudio(final boolean flag) {
+        final String value = KEY_STEREO + "=" + (flag ? "1" : "0");
+        if (mAudioManager == null) {
+            mAudioManager = (AudioManager)getContext().getSystemService(Context.AUDIO_SERVICE);
+        }
+        mAudioManager.setParameters(value);
+        if (LOG) {
+            QcomLog.v(TAG, "setStereoAudio(" + flag + ") value=" + value);
+        }
+    }
+    
+    private void updateStereoAudioIcon() {
+        if (mMenuStereoAudio != null) {
+            if (mCurrentStereoAudio) {
+                mMenuStereoAudio.setTitle(R.string.single_track);
+            } else {
+                mMenuStereoAudio.setTitle(R.string.stereo);
+            }
+        }
+    }
+    
+    private void enableStereoAudio() {
+        if (LOG) {
+            QcomLog.v(TAG, "enableStereoAudio() mIsInitedStereoAudio=" + mIsInitedStereoAudio
+                    + ", mCurrentStereoAudio=" + mCurrentStereoAudio);
+        }
+        mSystemStereoAudio = getStereoAudio();
+        if (!mIsInitedStereoAudio) {
+            mCurrentStereoAudio = mSystemStereoAudio;
+            mIsInitedStereoAudio = true;
+        } else {
+            //if activity is not from onCreate()
+            //restore old stereo type
+            setStereoAudio(mCurrentStereoAudio);
+        }
+        updateStereoAudioIcon();
+    }
+    
+    private void restoreStereoAudio() {
+        setStereoAudio(mSystemStereoAudio);
+    }
+}