session/server/background_audio_controller.cpp

/*
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * 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.
 */

#include "background_audio_controller.h"
#include "avsession_log.h"
#include "avsession_service.h"
#include "avsession_item.h"
#include "permission_checker.h"

namespace OHOS::AVSession {
using AudioStandard::RendererState;

BackgroundAudioController::BackgroundAudioController() : ptr_(nullptr)
{
    SLOGI("construct");
}

BackgroundAudioController::~BackgroundAudioController()
{
    SLOGI("destroy");
}

void BackgroundAudioController::Init(AVSessionService *ptr)
{
    ptr_ = ptr;
    AudioAdapter::GetInstance().AddStreamRendererStateListener([this](const auto& infos) {
        HandleAudioStreamRendererStateChange(infos);
    });
    AppManagerAdapter::GetInstance().SetAppStateChangeObserver([this](int32_t uid, int32_t pid, bool isBackground) {
        SLOGI("set background observe for uid=%{public}d, pid=%{public}d, isBackground=%{public}d",
            uid, pid, isBackground);
        HandleAppMuteState(uid, pid, isBackground);
    });
}

void BackgroundAudioController::OnSessionCreate(const AVSessionDescriptor& descriptor)
{
    std::lock_guard lockGuard(lock_);
    auto it = sessionUIDs_.find(descriptor.uid_);
    if (it == sessionUIDs_.end()) {
        std::set<int32_t> pidSet;
        pidSet.insert(descriptor.pid_);
        sessionUIDs_.insert(std::make_pair(descriptor.uid_, pidSet));
    } else {
        it->second.insert(descriptor.pid_);
    }
    SLOGI("OnSessionCreate remove observe for uid %{public}d pid %{public}d", descriptor.uid_, descriptor.pid_);
    AppManagerAdapter::GetInstance().RemoveObservedApp(descriptor.uid_);
}

void BackgroundAudioController::OnSessionRelease(const AVSessionDescriptor& descriptor)
{
    bool isEmpty = false;
    {
        std::lock_guard lockGuard(lock_);
        auto it = sessionUIDs_.find(descriptor.uid_);
        if (it != sessionUIDs_.end()) {
            it->second.erase(descriptor.pid_);
            if (it->second.empty()) {
                it = sessionUIDs_.erase(it);
                isEmpty = true;
            }
        }
    }

    if (descriptor.isThirdPartyApp_ && isEmpty) {
        SLOGI("OnSessionRelease add observe for uid %{public}d isPidEmpty %{public}d", descriptor.uid_, isEmpty);
        AppManagerAdapter::GetInstance().AddObservedApp(descriptor.uid_);
        if (AppManagerAdapter::GetInstance().IsAppBackground(descriptor.uid_, descriptor.pid_)) {
            auto mute = AudioAdapter::GetInstance().MuteAudioStream(descriptor.uid_, descriptor.pid_);
            if (mute == AVSESSION_SUCCESS && ptr_ != nullptr) {
                SLOGI("mute uid=%{public}d done", descriptor.uid_);
                ptr_->NotifyAudioSessionCheckTrigger(descriptor.uid_);
            }
        }
    }
}

void BackgroundAudioController::RendererChangeReport(AudioStandard::AudioRendererChangeInfo& info)
{
    if (info.rendererState == AudioStandard::RENDERER_RUNNING ||
        info.rendererState == AudioStandard::RENDERER_PAUSED ||
        info.rendererState == AudioStandard::RENDERER_STOPPED) {
            ptr_->NotifyBackgroundReportCheck(info.clientUID, info.clientPid, info.rendererInfo.streamUsage,
                info.rendererState);
        }
}

// LCOV_EXCL_START
void BackgroundAudioController::HandleAudioStreamRendererStateChange(const AudioRendererChangeInfos& infos)
{
    for (const auto& info : infos) {
        if (info->rendererState != AudioStandard::RENDERER_RUNNING) {
            continue;
        }
        if (!AppManagerAdapter::GetInstance().IsAppBackground(info->clientUID, info->clientPid)) {
            SLOGI("AudioStreamRendererStateChange add observe for uid %{public}d", info->clientUID);
            AppManagerAdapter::GetInstance().AddObservedApp(info->clientUID);
            if (!info->backMute) {
                SLOGI("uid=%{public}d renderer=%{public}d fore unmute, continue", info->clientUID, info->sessionId);
            } else {
                AudioAdapter::GetInstance().UnMuteAudioStream(info->clientUID, info->rendererInfo.streamUsage);
            }
            continue;
        }
        if (HasAVSession(info->clientUID)) {
            RendererChangeReport(*info);
            continue;
        }
        if (PermissionChecker::GetInstance().CheckSystemPermissionByUid(info->clientUID)) {
            SLOGD("uid=%{public}d is system app", info->clientUID);
            continue;
        }
        if (info->backMute) {
            SLOGI("renderer=%{public}d back is mute, continue", info->sessionId);
            continue;
        }
        auto mute = AudioAdapter::GetInstance().MuteAudioStream(info->clientUID, info->rendererInfo.streamUsage);
        if (mute == AVSESSION_SUCCESS && ptr_ != nullptr) {
            SLOGI("mute uid=%{public}d done", info->clientUID);
            ptr_->NotifyAudioSessionCheckTrigger(info->clientUID);
        }
    }
}

void BackgroundAudioController::HandleAppMuteState(int32_t uid, int32_t pid, bool isBackground)
{
    if (!isBackground) {
        SLOGI("try unmute uid=%{public}d", uid);
        AudioAdapter::GetInstance().UnMuteAudioStream(uid);
        return;
    }
    if (PermissionChecker::GetInstance().CheckSystemPermissionByUid(uid)) {
        SLOGD("uid=%{public}d is system app", uid);
        return;
    }
    if (HasAVSession(uid)) {
        return;
    }

    auto mute = AudioAdapter::GetInstance().MuteAudioStream(uid, pid);
    if (mute == AVSESSION_SUCCESS && ptr_ != nullptr) {
        SLOGI("mute uid=%{public}d done", uid);
        ptr_->NotifyAudioSessionCheckTrigger(uid);
    }
}
// LCOV_EXCL_STOP

bool BackgroundAudioController::IsBackgroundMode(int32_t creatorUid, BackgroundMode backgroundMode) const
{
    // LCOV_EXCL_START
    std::vector<std::shared_ptr<ContinuousTaskCallbackInfo>> continuousTaskList;
    ErrCode code = BackgroundTaskMgr::BackgroundTaskMgrHelper::GetContinuousTaskApps(continuousTaskList);
    if (code != OHOS::ERR_OK) {
        SLOGE("uid=%{public}d no continuous task list, code=%{public}d", creatorUid, code);
        return false;
    }
    // LCOV_EXCL_STOP

    for (const auto &task : continuousTaskList) {
        SLOGD("uid=%{public}d taskCreatorUid=%{public}d", creatorUid, task->GetCreatorUid());
        if (task->GetCreatorUid() != creatorUid) {
            continue;
        }

        std::vector<uint32_t> bgModeIds = task->GetTypeIds();
        auto it = std::find_if(bgModeIds.begin(), bgModeIds.end(), [ = ](auto mode) {
            uint32_t uMode = static_cast<uint32_t>(backgroundMode);
            return (mode == uMode);
        });
        if (it != bgModeIds.end()) {
            SLOGD("uid=%{public}d is audio playback", creatorUid);
            return true;
        }
    }
    SLOGD("uid=%{public}d isn't audio playback", creatorUid);
    return false;
}

bool BackgroundAudioController::HasAVSession(int32_t uid)
{
    std::lock_guard lockGuard(lock_);
    bool hasSession = false;
    auto it = sessionUIDs_.find(uid);
    if (it != sessionUIDs_.end()) {
        SLOGD("uid=%{public}d has av_session, no need to handle mute or unmute strategy.", uid);
        hasSession = true;
    }
    return hasSession;
}
}