status_t BnCameraClient::onTransact(
    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
{
    switch(code) {
        case NOTIFY_CALLBACK: {
            ALOGV("NOTIFY_CALLBACK");
            CHECK_INTERFACE(ICameraClient, data, reply);
            int32_t msgType = data.readInt32();
            int32_t ext1    = data.readInt32();
            int32_t ext2    = 0;
            if ((msgType == CAMERA_MSG_PREVIEW_FRAME) && (ext1 == CAMERA_FRAME_DATA_FD)) {
                ext2 = data.readFileDescriptor();
                ALOGD("onTransact: CAMERA_MSG_PREVIEW_FRAME fd = %d", ext2);
            } else {
                ext2 = data.readInt32();
            }
            notifyCallback(msgType, ext1, ext2);
            return NO_ERROR;
        } break;
        case DATA_CALLBACK: {
            ALOGV("DATA_CALLBACK");
            CHECK_INTERFACE(ICameraClient, data, reply);
            int32_t msgType = data.readInt32();
            sp<IMemory> imageData = interface_cast<IMemory>(data.readStrongBinder());
            camera_frame_metadata_t *metadata = NULL;
            if (data.dataAvail() > 0) {
                metadata = new camera_frame_metadata_t;
                metadata->number_of_faces = data.readInt32();
                metadata->faces = (camera_face_t *) data.readInplace(
                        sizeof(camera_face_t) * metadata->number_of_faces);
            }
            dataCallback(msgType, imageData, metadata);
            if (metadata) delete metadata;
            return NO_ERROR;
        } break;
        case DATA_CALLBACK_TIMESTAMP: {
            ALOGV("DATA_CALLBACK_TIMESTAMP");
            CHECK_INTERFACE(ICameraClient, data, reply);
            nsecs_t timestamp = data.readInt64();
            int32_t msgType = data.readInt32();
            sp<IMemory> imageData = interface_cast<IMemory>(data.readStrongBinder());
            dataCallbackTimestamp(timestamp, msgType, imageData);
            return NO_ERROR;
        } break;
        default:
            return BBinder::onTransact(code, data, reply, flags);
    }
}
status_t BnCameraRecordingProxyListener::onTransact(
    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
{
    switch(code) {
        case DATA_CALLBACK_TIMESTAMP: {
            ALOGV("DATA_CALLBACK_TIMESTAMP");
            CHECK_INTERFACE(ICameraRecordingProxyListener, data, reply);
            nsecs_t timestamp = data.readInt64();
            int32_t msgType = data.readInt32();
            sp<IMemory> imageData = interface_cast<IMemory>(data.readStrongBinder());
            dataCallbackTimestamp(timestamp, msgType, imageData);
            return NO_ERROR;
        } break;
        case RECORDING_FRAME_HANDLE_CALLBACK_TIMESTAMP: {
            ALOGV("RECORDING_FRAME_HANDLE_CALLBACK_TIMESTAMP");
            CHECK_INTERFACE(ICameraRecordingProxyListener, data, reply);
            nsecs_t timestamp;
            status_t res = data.readInt64(&timestamp);
            if (res != OK) {
                ALOGE("%s: Failed to read timestamp: %s (%d)", __FUNCTION__, strerror(-res), res);
                return BAD_VALUE;
            }

            native_handle_t* handle = data.readNativeHandle();
            if (handle == nullptr) {
                ALOGE("%s: Received a null native handle", __FUNCTION__);
                return BAD_VALUE;
            }
            // The native handle will be freed in
            // BpCameraRecordingProxy::releaseRecordingFrameHandle.
            recordingFrameHandleCallbackTimestamp(timestamp, handle);
            return NO_ERROR;
        } break;
        case RECORDING_FRAME_HANDLE_CALLBACK_TIMESTAMP_BATCH: {
            ALOGV("RECORDING_FRAME_HANDLE_CALLBACK_TIMESTAMP_BATCH");
            CHECK_INTERFACE(ICameraRecordingProxyListener, data, reply);
            uint32_t n = 0;
            status_t res = data.readUint32(&n);
            if (res != OK) {
                ALOGE("%s: Failed to read batch size: %s (%d)", __FUNCTION__, strerror(-res), res);
                return BAD_VALUE;
            }
            std::vector<nsecs_t> timestamps;
            std::vector<native_handle_t*> handles;
            timestamps.reserve(n);
            handles.reserve(n);
            for (uint32_t i = 0; i < n; i++) {
                nsecs_t t;
                res = data.readInt64(&t);
                if (res != OK) {
                    ALOGE("%s: Failed to read timestamp[%d]: %s (%d)",
                            __FUNCTION__, i, strerror(-res), res);
                    return BAD_VALUE;
                }
                timestamps.push_back(t);
            }
            for (uint32_t i = 0; i < n; i++) {
                native_handle_t* handle = data.readNativeHandle();
                if (handle == nullptr) {
                    ALOGE("%s: Received a null native handle at handles[%d]",
                            __FUNCTION__, i);
                    return BAD_VALUE;
                }
                handles.push_back(handle);
            }
            // The native handle will be freed in
            // BpCameraRecordingProxy::releaseRecordingFrameHandleBatch.
            recordingFrameHandleCallbackTimestampBatch(timestamps, handles);
            return NO_ERROR;
        } break;
        default:
            return BBinder::onTransact(code, data, reply, flags);
    }
}