media/libstagefright/include/media/stagefright/PersistentSurface.h

/*
 * Copyright 2015 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.
 */

#ifndef PERSISTENT_SURFACE_H_

#define PERSISTENT_SURFACE_H_

#include <android/binder_auto_utils.h>
#include <android/binder_libbinder.h>
#include <binder/Parcel.h>
#include <hidl/HidlSupport.h>
#include <hidl/HybridInterface.h>
#include <gui/IGraphicBufferProducer.h>
#include <media/stagefright/foundation/ABase.h>

namespace android {

struct PersistentSurface : public RefBase {
    PersistentSurface() {}

    // create a persistent surface in HIDL
    PersistentSurface(
            const sp<IGraphicBufferProducer>& bufferProducer,
            const sp<hidl::base::V1_0::IBase>& hidlTarget) :
        mBufferProducer(bufferProducer),
        mHidlTarget(hidlTarget),
        mAidlTarget(nullptr),
        mAidl(false) { }

    // create a persistent surface in AIDL
    PersistentSurface(
            const sp<IGraphicBufferProducer>& bufferProducer,
            const ::ndk::SpAIBinder& aidlTarget) :
        mBufferProducer(bufferProducer),
        mHidlTarget(nullptr),
        mAidlTarget(aidlTarget),
        mAidl(true) { }

    sp<IGraphicBufferProducer> getBufferProducer() const {
        return mBufferProducer;
    }

    bool isTargetAidl() const {
        return mAidl;
    }

    sp<hidl::base::V1_0::IBase> getHidlTarget() const {
        return mAidl ? nullptr : mHidlTarget;
    }

    ::ndk::SpAIBinder getAidlTarget() const {
        return mAidl ? mAidlTarget : nullptr;
    }

    status_t writeToParcel(Parcel *parcel) const {
        parcel->writeStrongBinder(IInterface::asBinder(mBufferProducer));
        // write hidl target if available
        if (mHidlTarget != nullptr) {
            HalToken token;
            bool result = createHalToken(mHidlTarget, &token);
            parcel->writeBool(result);
            if (result) {
                parcel->writeByteArray(token.size(), token.data());
            }
        } else {
            parcel->writeBool(false);
        }
        // write aidl target if available
        if (mAidl) {
            AIBinder *binder = mAidlTarget.get();
            if (binder != nullptr) {
                ::android::sp<::android::IBinder> intf =
                        AIBinder_toPlatformBinder(binder);
                if (intf) {
                    parcel->writeBool(true);
                    parcel->writeStrongBinder(intf);
                } else {
                    parcel->writeBool(false);
                }
            } else {
                parcel->writeBool(false);
            }
        }
        return NO_ERROR;
    }

    status_t readFromParcel(const Parcel *parcel) {
        mBufferProducer = interface_cast<IGraphicBufferProducer>(
                parcel->readStrongBinder());
        // read hidl target
        bool haveHidlTarget = parcel->readBool();
        mAidl = false;
        if (haveHidlTarget) {
            std::vector<uint8_t> tokenVector;
            parcel->readByteVector(&tokenVector);
            HalToken token = HalToken(tokenVector);
            mHidlTarget = retrieveHalInterface(token);
            deleteHalToken(token);
            return NO_ERROR;
        } else {
            mHidlTarget.clear();
        }

        // read aidl target
        bool haveAidlTarget = false;
        if (parcel->readBool(&haveAidlTarget) != NO_ERROR) {
            return NO_ERROR;
        }
        mAidl = true;
        if (haveAidlTarget) {
            ::android::sp<::android::IBinder> intf = parcel->readStrongBinder();
            AIBinder *ndkBinder = AIBinder_fromPlatformBinder(intf);
            if (ndkBinder) {
                mAidlTarget.set(ndkBinder);
            } else {
                mAidlTarget.set(nullptr);
            }
        } else {
            mAidlTarget.set(nullptr);
        }
        return NO_ERROR;
    }

private:
    sp<IGraphicBufferProducer> mBufferProducer;
    sp<hidl::base::V1_0::IBase> mHidlTarget;
    ::ndk::SpAIBinder mAidlTarget;
    bool mAidl;

    DISALLOW_EVIL_CONSTRUCTORS(PersistentSurface);
};

}  // namespace android

#endif  // PERSISTENT_SURFACE_H_