From 37d7804627eecaf04e170793c2f5703d5d6d44e8 Mon Sep 17 00:00:00 2001
From: Jean-Michel Trivi <jmtrivi@google.com>
Date: Sun, 10 Aug 2014 14:59:15 -0700
Subject: [PATCH] HDMI plug intent and associated information

Read HDMI device information from audio ports and add it as
 extras in the connection intent.
Document the new extras in the connection intent.
Make Intent.ACTION_HDMI_AUDIO_PLUG public.

Bug 10549017

Change-Id: I6236b5363f00c433e443195fae8c43af2fc834f7
---
 api/current.txt                            |  1 +
 core/java/android/content/Intent.java      | 11 ++++--
 media/java/android/media/AudioService.java | 45 +++++++++++++++++++++-
 3 files changed, 53 insertions(+), 4 deletions(-)

diff --git a/api/current.txt b/api/current.txt
index 652bfe221e2b5..e8d1369abdef5 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -7702,6 +7702,7 @@ package android.content {
     field public static final java.lang.String ACTION_GET_RESTRICTION_ENTRIES = "android.intent.action.GET_RESTRICTION_ENTRIES";
     field public static final java.lang.String ACTION_GTALK_SERVICE_CONNECTED = "android.intent.action.GTALK_CONNECTED";
     field public static final java.lang.String ACTION_GTALK_SERVICE_DISCONNECTED = "android.intent.action.GTALK_DISCONNECTED";
+    field public static final java.lang.String ACTION_HDMI_AUDIO_PLUG = "android.intent.action.HDMI_AUDIO_PLUG";
     field public static final java.lang.String ACTION_HEADSET_PLUG = "android.intent.action.HEADSET_PLUG";
     field public static final java.lang.String ACTION_INPUT_METHOD_CHANGED = "android.intent.action.INPUT_METHOD_CHANGED";
     field public static final java.lang.String ACTION_INSERT = "android.intent.action.INSERT";
diff --git a/core/java/android/content/Intent.java b/core/java/android/content/Intent.java
index 04a06af2b6c4f..974ff136f2176 100644
--- a/core/java/android/content/Intent.java
+++ b/core/java/android/content/Intent.java
@@ -2279,15 +2279,20 @@ public class Intent implements Parcelable, Cloneable {
             "android.intent.action.DIGITAL_AUDIO_DOCK_PLUG";
 
     /**
-     * Broadcast Action: A HMDI cable was plugged or unplugged
+     * Broadcast Action: A sticky broadcast indicating an HMDI cable was plugged or unplugged
      *
      * <p>The intent will have the following extra values:
      * <ul>
      *   <li><em>state</em> - 0 for unplugged, 1 for plugged. </li>
      *   <li><em>name</em> - HDMI cable, human readable string </li>
+     *   <li><em>maxChannelCount</em> - the maximum number of output channels supported by the
+     *       connected HDMI device, only available when <i>state</i> is 1.</li>
+     *   <li><em>encodings</em> - an array of formats supported by the connected HDMI device,
+     *       only available when <i>state</i> is 1. Encoding values are defined in
+     *       {@link android.media.AudioFormat} (for instance see
+     *       {@link android.media.AudioFormat#ENCODING_PCM_16BIT}). Use
+     *       {@link #getIntArrayExtra(String)} to retrieve the encoding values.</li>
      * </ul>
-     * </ul>
-     * @hide
      */
     @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
     public static final String ACTION_HDMI_AUDIO_PLUG =
diff --git a/media/java/android/media/AudioService.java b/media/java/android/media/AudioService.java
index fb7f0c6e2444b..c6489a63c3fd9 100644
--- a/media/java/android/media/AudioService.java
+++ b/media/java/android/media/AudioService.java
@@ -4389,7 +4389,7 @@ public class AudioService extends IAudioService.Stub {
             intent.setAction(Intent.ACTION_DIGITAL_AUDIO_DOCK_PLUG);
         } else if (device == AudioSystem.DEVICE_OUT_HDMI) {
             connType = AudioRoutesInfo.MAIN_HDMI;
-            intent.setAction(Intent.ACTION_HDMI_AUDIO_PLUG);
+            configureHdmiPlugIntent(intent, state);
         }
 
         synchronized (mCurAudioRoutes) {
@@ -4471,6 +4471,49 @@ public class AudioService extends IAudioService.Stub {
         }
     }
 
+    private void configureHdmiPlugIntent(Intent intent, int state) {
+        intent.setAction(Intent.ACTION_HDMI_AUDIO_PLUG);
+        if (state == 1) {
+            ArrayList<AudioPort> ports = new ArrayList<AudioPort>();
+            int[] portGeneration = new int[1];
+            int status = AudioSystem.listAudioPorts(ports, portGeneration);
+            if (status == AudioManager.SUCCESS) {
+                for (AudioPort port : ports) {
+                    if (port instanceof AudioDevicePort) {
+                        final AudioDevicePort devicePort = (AudioDevicePort) port;
+                        if (devicePort.type() == AudioManager.DEVICE_OUT_HDMI) {
+                            // format the list of supported encodings
+                            int[] formats = devicePort.formats();
+                            if (formats.length > 0) {
+                                ArrayList<Integer> encodingList = new ArrayList(1);
+                                for (int format : formats) {
+                                    // a format in the list can be 0, skip it
+                                    if (format != AudioFormat.ENCODING_INVALID) {
+                                        encodingList.add(format);
+                                    }
+                                }
+                                int[] encodingArray = new int[encodingList.size()];
+                                for (int i = 0 ; i < encodingArray.length ; i++) {
+                                    encodingArray[i] = encodingList.get(i);
+                                }
+                                intent.putExtra("encodings", encodingArray);
+                            }
+                            // find the maximum supported number of channels
+                            int maxChannels = 0;
+                            for (int mask : devicePort.channelMasks()) {
+                                int channelCount = AudioFormat.channelCountFromOutChannelMask(mask);
+                                if (channelCount > maxChannels) {
+                                    maxChannels = channelCount;
+                                }
+                            }
+                            intent.putExtra("maxChannelCount", maxChannels);
+                        }
+                    }
+                }
+            }
+        }
+    }
+
     /* cache of the address of the last dock the device was connected to */
     private String mDockAddress;