services/audiopolicy/service/CaptureStateNotifier.cpp

#define LOG_TAG "CaptureStateNotifier"

#include "CaptureStateNotifier.h"

#include <android/media/ICaptureStateListener.h>
#include <binder/IBinder.h>
#include <utils/Log.h>

namespace android {

using media::ICaptureStateListener;

class CaptureStateNotifier::DeathRecipient : public IBinder::DeathRecipient {
public:
    DeathRecipient(CaptureStateNotifier* notifier) : mNotifier(notifier) {}

    void binderDied(const wp<IBinder>&) override {
        mNotifier->binderDied();
    }

private:
    CaptureStateNotifier* const mNotifier;
};

CaptureStateNotifier::CaptureStateNotifier(bool initialActive)
    : mDeathRecipient(new DeathRecipient(this)), mActive(
    initialActive) {}

CaptureStateNotifier::~CaptureStateNotifier() {
    LOG_ALWAYS_FATAL_IF(mListener != nullptr);
}

bool CaptureStateNotifier::RegisterListener(const sp<ICaptureStateListener>& listener) {
    std::lock_guard<std::mutex> _l(mMutex);
    LOG_ALWAYS_FATAL_IF(mListener != nullptr);
    LOG_ALWAYS_FATAL_IF(listener == nullptr);

    ALOGI("Registering a listener");
    sp<IBinder> binder = IInterface::asBinder(listener);
    if (binder != nullptr) {
        status_t status = binder->linkToDeath(mDeathRecipient);
        if (status == NO_ERROR) {
            mListener = listener;
        } else {
            ALOGE("Failed to register death listener: %u", status);
        }
    } else {
        ALOGE("Listener failed to cast to a binder.");
    }
    return mActive;
}

void CaptureStateNotifier::setCaptureState(bool active) {
    std::lock_guard<std::mutex> _l(mMutex);
    mActive = active;
    if (mListener) {
        mListener->setCaptureState(active);
    }
}

void CaptureStateNotifier::binderDied() {
    std::lock_guard<std::mutex> _l(mMutex);
    mListener.clear();
    ALOGI("Listener binder died");
}

}  // namespace android