camera/IProCameraUser.cpp

/*
**
** Copyright 2013, 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_NDEBUG 0
#define LOG_TAG "IProCameraUser"
#include <utils/Log.h>
#include <stdint.h>
#include <sys/types.h>
#include <binder/Parcel.h>
#include <camera/IProCameraUser.h>
#include <gui/IGraphicBufferProducer.h>
#include <gui/Surface.h>
#include <system/camera_metadata.h>

namespace android {

typedef Parcel::WritableBlob WritableBlob;
typedef Parcel::ReadableBlob ReadableBlob;

enum {
    DISCONNECT = IBinder::FIRST_CALL_TRANSACTION,
    CONNECT,
    EXCLUSIVE_TRY_LOCK,
    EXCLUSIVE_LOCK,
    EXCLUSIVE_UNLOCK,
    HAS_EXCLUSIVE_LOCK,
    SUBMIT_REQUEST,
    CANCEL_REQUEST,
    REQUEST_STREAM,
    CANCEL_STREAM,
};

class BpProCameraUser: public BpInterface<IProCameraUser>
{
public:
    BpProCameraUser(const sp<IBinder>& impl)
        : BpInterface<IProCameraUser>(impl)
    {
    }

    // disconnect from camera service
    void disconnect()
    {
        ALOGV("disconnect");
        Parcel data, reply;
        data.writeInterfaceToken(IProCameraUser::getInterfaceDescriptor());
        remote()->transact(DISCONNECT, data, &reply);
    }

    virtual status_t connect(const sp<IProCameraCallbacks>& cameraClient)
    {
        Parcel data, reply;
        data.writeInterfaceToken(IProCameraUser::getInterfaceDescriptor());
        data.writeStrongBinder(cameraClient->asBinder());
        remote()->transact(CONNECT, data, &reply);
        return reply.readInt32();
    }

    /* Shared ProCameraUser */

    virtual status_t exclusiveTryLock()
    {
        Parcel data, reply;
        data.writeInterfaceToken(IProCameraUser::getInterfaceDescriptor());
        remote()->transact(EXCLUSIVE_TRY_LOCK, data, &reply);
        return reply.readInt32();
    }
    virtual status_t exclusiveLock()
    {
        Parcel data, reply;
        data.writeInterfaceToken(IProCameraUser::getInterfaceDescriptor());
        remote()->transact(EXCLUSIVE_LOCK, data, &reply);
        return reply.readInt32();
    }

    virtual status_t exclusiveUnlock()
    {
        Parcel data, reply;
        data.writeInterfaceToken(IProCameraUser::getInterfaceDescriptor());
        remote()->transact(EXCLUSIVE_UNLOCK, data, &reply);
        return reply.readInt32();
    }

    virtual bool hasExclusiveLock()
    {
        Parcel data, reply;
        data.writeInterfaceToken(IProCameraUser::getInterfaceDescriptor());
        remote()->transact(HAS_EXCLUSIVE_LOCK, data, &reply);
        return !!reply.readInt32();
    }

    virtual int submitRequest(camera_metadata_t* metadata, bool streaming)
    {

        Parcel data, reply;
        data.writeInterfaceToken(IProCameraUser::getInterfaceDescriptor());

        // arg0 = metadataSize (int32)
        size_t metadataSize = get_camera_metadata_compact_size(metadata);
        data.writeInt32(static_cast<int32_t>(metadataSize));

        // arg1 = metadata (blob)
        WritableBlob blob;
        {
            data.writeBlob(metadataSize, &blob);
            copy_camera_metadata(blob.data(), metadataSize, metadata);
        }
        blob.release();

        // arg2 = streaming (bool)
        data.writeInt32(streaming);

        remote()->transact(SUBMIT_REQUEST, data, &reply);
        return reply.readInt32();
    }

    virtual status_t cancelRequest(int requestId)
    {
        Parcel data, reply;
        data.writeInterfaceToken(IProCameraUser::getInterfaceDescriptor());
        data.writeInt32(requestId);

        remote()->transact(CANCEL_REQUEST, data, &reply);
        return reply.readInt32();
    }

    virtual status_t requestStream(int streamId)
    {
        Parcel data, reply;
        data.writeInterfaceToken(IProCameraUser::getInterfaceDescriptor());
        data.writeInt32(streamId);

        remote()->transact(REQUEST_STREAM, data, &reply);
        return reply.readInt32();
    }
    virtual status_t cancelStream(int streamId)
    {
        Parcel data, reply;
        data.writeInterfaceToken(IProCameraUser::getInterfaceDescriptor());
        data.writeInt32(streamId);

        remote()->transact(CANCEL_STREAM, data, &reply);
        return reply.readInt32();
    }

};

IMPLEMENT_META_INTERFACE(ProCameraUser, "android.hardware.IProCameraUser");

// ----------------------------------------------------------------------

status_t BnProCameraUser::onTransact(
    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
{
    switch(code) {
        case DISCONNECT: {
            ALOGV("DISCONNECT");
            CHECK_INTERFACE(IProCameraUser, data, reply);
            disconnect();
            return NO_ERROR;
        } break;
        case CONNECT: {
            CHECK_INTERFACE(IProCameraUser, data, reply);
            sp<IProCameraCallbacks> cameraClient =
                   interface_cast<IProCameraCallbacks>(data.readStrongBinder());
            reply->writeInt32(connect(cameraClient));
            return NO_ERROR;
        } break;

        /* Shared ProCameraUser */
        case EXCLUSIVE_TRY_LOCK: {
            CHECK_INTERFACE(IProCameraUser, data, reply);
            reply->writeInt32(exclusiveTryLock());
            return NO_ERROR;
        } break;
        case EXCLUSIVE_LOCK: {
            CHECK_INTERFACE(IProCameraUser, data, reply);
            reply->writeInt32(exclusiveLock());
            return NO_ERROR;
        } break;
        case EXCLUSIVE_UNLOCK: {
            CHECK_INTERFACE(IProCameraUser, data, reply);
            reply->writeInt32(exclusiveUnlock());
            return NO_ERROR;
        } break;
        case HAS_EXCLUSIVE_LOCK: {
            CHECK_INTERFACE(IProCameraUser, data, reply);
            reply->writeInt32(hasExclusiveLock());
            return NO_ERROR;
        } break;
        case SUBMIT_REQUEST: {
            CHECK_INTERFACE(IProCameraUser, data, reply);
            camera_metadata_t* metadata;

            // arg0 = metadataSize (int32)
            size_t metadataSize = static_cast<size_t>(data.readInt32());

            // NOTE: this doesn't make sense to me. shouldnt the blob
            // know how big it is? why do we have to specify the size
            // to Parcel::readBlob ?

            ReadableBlob blob;
            // arg1 = metadata (blob)
            {
                data.readBlob(metadataSize, &blob);
                const camera_metadata_t* tmp =
                        reinterpret_cast<const camera_metadata_t*>(blob.data());
                size_t entry_capacity = get_camera_metadata_entry_capacity(tmp);
                size_t data_capacity = get_camera_metadata_data_capacity(tmp);

                metadata = allocate_camera_metadata(entry_capacity,
                                                                 data_capacity);
                copy_camera_metadata(metadata, metadataSize, tmp);
            }
            blob.release();

            // arg2 = streaming (bool)
            bool streaming = data.readInt32();

            // return code: requestId (int32)
            reply->writeInt32(submitRequest(metadata, streaming));

            return NO_ERROR;
        } break;
        case CANCEL_REQUEST: {
            CHECK_INTERFACE(IProCameraUser, data, reply);
            int requestId = data.readInt32();
            reply->writeInt32(cancelRequest(requestId));
            return NO_ERROR;
        } break;
        case REQUEST_STREAM: {
            CHECK_INTERFACE(IProCameraUser, data, reply);
            int streamId = data.readInt32();
            reply->writeInt32(requestStream(streamId));
            return NO_ERROR;
        } break;
        case CANCEL_STREAM: {
            CHECK_INTERFACE(IProCameraUser, data, reply);
            int streamId = data.readInt32();
            reply->writeInt32(cancelStream(streamId));
            return NO_ERROR;
        } break;
        default:
            return BBinder::onTransact(code, data, reply, flags);
    }
}

// ----------------------------------------------------------------------------

}; // namespace android