From cc0cd5eadf108f527895767f38b32c51affa928f Mon Sep 17 00:00:00 2001
From: Chen Chen <cncn@google.com>
Date: Mon, 31 Jan 2022 15:50:17 -0800
Subject: [PATCH] Spatial Audio: Add audio HAL interface for allowing or
 disallowing low latency audio

Bug: 214615268
Test: build
Tag: feature
Change-Id: I5c9e26edb1271cd69a487409506cc1b93f49e111
---
 bluetooth/audio/2.2/IBluetoothAudioProvider.hal      |  8 ++++++++
 .../audio/2.2/default/BluetoothAudioProvider.cpp     | 12 ++++++++++++
 bluetooth/audio/2.2/default/BluetoothAudioProvider.h |  2 ++
 3 files changed, 22 insertions(+)

diff --git a/bluetooth/audio/2.2/IBluetoothAudioProvider.hal b/bluetooth/audio/2.2/IBluetoothAudioProvider.hal
index f57753709c..7c91805619 100644
--- a/bluetooth/audio/2.2/IBluetoothAudioProvider.hal
+++ b/bluetooth/audio/2.2/IBluetoothAudioProvider.hal
@@ -69,4 +69,12 @@ interface IBluetoothAudioProvider extends @2.1::IBluetoothAudioProvider {
      *    encoding.
      */
     updateAudioConfiguration(AudioConfiguration audioConfig);
+
+    /**
+     * Called when the supported latency mode is updated.
+     *
+     * @param allowed If the peripheral devices can't keep up with low latency
+     * mode, the API will be called with supported is false.
+     */
+    setLowLatencyModeAllowed(bool allowed);
 };
diff --git a/bluetooth/audio/2.2/default/BluetoothAudioProvider.cpp b/bluetooth/audio/2.2/default/BluetoothAudioProvider.cpp
index 202cfb9f90..62511e922a 100644
--- a/bluetooth/audio/2.2/default/BluetoothAudioProvider.cpp
+++ b/bluetooth/audio/2.2/default/BluetoothAudioProvider.cpp
@@ -209,6 +209,18 @@ Return<void> BluetoothAudioProvider::updateAudioConfiguration(
   return Void();
 }
 
+Return<void> BluetoothAudioProvider::setLowLatencyModeAllowed(bool allowed) {
+  LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_);
+
+  if (stack_iface_ == nullptr) {
+    LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+              << " has NO session";
+    return Void();
+  }
+  LOG(INFO) << __func__ << " allowed: " << allowed;
+  return Void();
+}
+
 }  // namespace implementation
 }  // namespace V2_2
 }  // namespace audio
diff --git a/bluetooth/audio/2.2/default/BluetoothAudioProvider.h b/bluetooth/audio/2.2/default/BluetoothAudioProvider.h
index 425ea3b303..90c158e5b5 100644
--- a/bluetooth/audio/2.2/default/BluetoothAudioProvider.h
+++ b/bluetooth/audio/2.2/default/BluetoothAudioProvider.h
@@ -56,6 +56,8 @@ class BluetoothAudioProvider : public IBluetoothAudioProvider {
   Return<void> updateAudioConfiguration(
       const AudioConfiguration& audioConfig) override;
 
+  Return<void> setLowLatencyModeAllowed(bool allowed) override;
+
  protected:
   sp<BluetoothAudioDeathRecipient> death_recipient_;