Set the AVRCP Browsing MTU for a device after browse open

Trying to get the Browsing MTU before the Browsing channel is opened
returns the minimum MTU. This leads to smaller browsing messages than
expected.

Bug: 113160447
Test: Connect to device and see that Avrcp Browse packets are the
correct size

Change-Id: Iefda855d0a777439a8a6829619bc4c5543b62eaf

system/profile/avrcp/connection_handler.cc

@@ -273,13 +273,20 @@ void ConnectionHandler::InitiatorControlCb(uint8_t handle, uint8_t event,
       device_map_.erase(handle);
     } break;
 
-    case AVRC_BROWSE_OPEN_IND_EVT:
+    case AVRC_BROWSE_OPEN_IND_EVT: {
       LOG(INFO) << __PRETTY_FUNCTION__ << ": Browse Open Event";
       // NOTE (apanicke): We don't need to explicitly handle this message
       // since the AVCTP Layer will still send us browsing messages
       // regardless. It would be useful to note this though for future
       // compatibility issues.
-      break;
+      if (device_map_.find(handle) == device_map_.end()) {
+        LOG(WARNING) << "Browse Opened received from device that doesn't exist";
+        return;
+      }
+
+      auto browse_mtu = avrc_->GetBrowseMtu(handle) - AVCT_HDR_LEN;
+      device_map_[handle]->SetBrowseMtu(browse_mtu);
+    } break;
     case AVRC_BROWSE_CLOSE_IND_EVT:
       LOG(INFO) << __PRETTY_FUNCTION__ << ": Browse Close Event";
       break;
@@ -357,13 +364,20 @@ void ConnectionHandler::AcceptorControlCb(uint8_t handle, uint8_t event,
       device_map_.erase(handle);
     } break;
 
-    case AVRC_BROWSE_OPEN_IND_EVT:
+    case AVRC_BROWSE_OPEN_IND_EVT: {
       LOG(INFO) << __PRETTY_FUNCTION__ << ": Browse Open Event";
       // NOTE (apanicke): We don't need to explicitly handle this message
       // since the AVCTP Layer will still send us browsing messages
       // regardless. It would be useful to note this though for future
       // compatibility issues.
-      break;
+      if (device_map_.find(handle) == device_map_.end()) {
+        LOG(WARNING) << "Browse Opened received from device that doesn't exist";
+        return;
+      }
+
+      auto browse_mtu = avrc_->GetBrowseMtu(handle) - AVCT_HDR_LEN;
+      device_map_[handle]->SetBrowseMtu(browse_mtu);
+    } break;
     case AVRC_BROWSE_CLOSE_IND_EVT:
       LOG(INFO) << __PRETTY_FUNCTION__ << ": Browse Close Event";
       break;

system/profile/avrcp/device.cc

@@ -59,6 +59,11 @@ void Device::RegisterInterfaces(MediaInterface* media_interface,
   volume_interface_ = volume_interface;
 }
 
+void Device::SetBrowseMtu(uint16_t browse_mtu) {
+  DEVICE_LOG(INFO) << __PRETTY_FUNCTION__ << ": browse_mtu = " << browse_mtu;
+  browse_mtu_ = browse_mtu;
+}
+
 bool Device::IsActive() const {
   return address_ == a2dp_interface_->active_peer();
 }

system/profile/avrcp/device.h

@@ -90,6 +90,12 @@ class Device {
                           A2dpInterface* a2dp_interface,
                           VolumeInterface* volume_interface);
 
+  /**
+   * Set the maximum size of a AVRCP Browsing Packet. This is done after the
+   * connection of the Browsing channel.
+   */
+  void SetBrowseMtu(uint16_t browse_mtu);
+
   /**
    * Notify the device that metadata, play_status, and/or queue have updated
    * via a boolean. Each boolean represents whether its respective content has