From 6ab53e76a3d1f7969c95668aa254987aeb818154 Mon Sep 17 00:00:00 2001
From: Josh Wu <joshwu@google.com>
Date: Wed, 29 Dec 2021 23:53:33 -0800
Subject: Add Bluetooth Audio default AIDL implementation

Test: manual
Bug: 203490261
Change-Id: I39224ecdd18b9eb0626d6188442a33ef65820673
---
 .../aidl/default/LeAudioSoftwareAudioProvider.cpp  | 125 +++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 bluetooth/audio/aidl/default/LeAudioSoftwareAudioProvider.cpp

(limited to 'bluetooth/audio/aidl/default/LeAudioSoftwareAudioProvider.cpp')

diff --git a/bluetooth/audio/aidl/default/LeAudioSoftwareAudioProvider.cpp b/bluetooth/audio/aidl/default/LeAudioSoftwareAudioProvider.cpp
new file mode 100644
index 0000000000..f9962fd9d9
--- /dev/null
+++ b/bluetooth/audio/aidl/default/LeAudioSoftwareAudioProvider.cpp
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioProviderLeAudioHW"
+
+#include "LeAudioSoftwareAudioProvider.h"
+
+#include <BluetoothAudioCodecs.h>
+#include <BluetoothAudioSessionReport.h>
+#include <android-base/logging.h>
+
+#include <cstdint>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+static constexpr uint32_t kBufferOutCount = 2;  // two frame buffer
+static constexpr uint32_t kBufferInCount = 2;   // two frame buffer
+
+inline uint32_t channel_mode_to_channel_count(ChannelMode channel_mode) {
+  switch (channel_mode) {
+    case ChannelMode::MONO:
+      return 1;
+    case ChannelMode::STEREO:
+      return 2;
+    default:
+      return 0;
+  }
+  return 0;
+}
+
+LeAudioSoftwareOutputAudioProvider::LeAudioSoftwareOutputAudioProvider()
+    : LeAudioSoftwareAudioProvider() {
+  session_type_ = SessionType::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH;
+}
+
+LeAudioSoftwareInputAudioProvider::LeAudioSoftwareInputAudioProvider()
+    : LeAudioSoftwareAudioProvider() {
+  session_type_ = SessionType::LE_AUDIO_SOFTWARE_DECODING_DATAPATH;
+}
+
+LeAudioSoftwareAudioProvider::LeAudioSoftwareAudioProvider()
+    : BluetoothAudioProvider(), data_mq_(nullptr) {}
+
+bool LeAudioSoftwareAudioProvider::isValid(const SessionType& sessionType) {
+  return (sessionType == session_type_);
+}
+
+ndk::ScopedAStatus LeAudioSoftwareAudioProvider::startSession(
+    const std::shared_ptr<IBluetoothAudioPort>& host_if,
+    const AudioConfiguration& audio_config, DataMQDesc* _aidl_return) {
+  if (audio_config.getTag() != AudioConfiguration::pcmConfig) {
+    LOG(WARNING) << __func__ << " - Invalid Audio Configuration="
+                 << audio_config.toString();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+  const auto& pcm_config = audio_config.get<AudioConfiguration::pcmConfig>();
+  if (!BluetoothAudioCodecs::IsSoftwarePcmConfigurationValid(pcm_config)) {
+    LOG(WARNING) << __func__ << " - Unsupported PCM Configuration="
+                 << pcm_config.toString();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+
+  uint32_t buffer_modifier = 0;
+  if (session_type_ == SessionType::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH)
+    buffer_modifier = kBufferOutCount;
+  else if (session_type_ == SessionType::LE_AUDIO_SOFTWARE_DECODING_DATAPATH)
+    buffer_modifier = kBufferInCount;
+
+  uint32_t data_mq_size =
+      (ceil(pcm_config.sampleRateHz) / 1000) *
+      channel_mode_to_channel_count(pcm_config.channelMode) *
+      (pcm_config.bitsPerSample / 8) * (pcm_config.dataIntervalUs / 1000) *
+      buffer_modifier;
+
+  LOG(INFO) << __func__ << " - size of audio buffer " << data_mq_size
+            << " byte(s)";
+
+  std::unique_ptr<DataMQ> temp_data_mq(
+      new DataMQ(data_mq_size, /* EventFlag */ true));
+  if (temp_data_mq == nullptr || !temp_data_mq->isValid()) {
+    ALOGE_IF(!temp_data_mq, "failed to allocate data MQ");
+    ALOGE_IF(temp_data_mq && !temp_data_mq->isValid(), "data MQ is invalid");
+    *_aidl_return = DataMQDesc();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+  data_mq_ = std::move(temp_data_mq);
+
+  return BluetoothAudioProvider::startSession(host_if, audio_config,
+                                              _aidl_return);
+}
+
+ndk::ScopedAStatus LeAudioSoftwareAudioProvider::onSessionReady(
+    DataMQDesc* _aidl_return) {
+  if (data_mq_ == nullptr || !data_mq_->isValid()) {
+    *_aidl_return = DataMQDesc();
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+  }
+  *_aidl_return = data_mq_->dupeDesc();
+  BluetoothAudioSessionReport::OnSessionStarted(session_type_, stack_iface_,
+                                                _aidl_return, *audio_config_);
+  return ndk::ScopedAStatus::ok();
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
\ No newline at end of file
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