services/camera/libcameraservice/Camera3Device.cpp

/*
 * Copyright (C) 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_TAG "Camera3-Device"
#define ATRACE_TAG ATRACE_TAG_CAMERA
//#define LOG_NDEBUG 0
//#define LOG_NNDEBUG 0  // Per-frame verbose logging

#ifdef LOG_NNDEBUG
#define ALOGVV(...) ALOGV(__VA_ARGS__)
#else
#define ALOGVV(...) ((void)0)
#endif

#include <utils/Log.h>
#include <utils/Trace.h>
#include <utils/Timers.h>
#include "Camera3Device.h"
#include "camera3/Camera3OutputStream.h"

using namespace android::camera3;

namespace android {

Camera3Device::Camera3Device(int id):
        mId(id),
        mHal3Device(NULL),
        mStatus(STATUS_UNINITIALIZED)
{
    ATRACE_CALL();
    camera3_callback_ops::notify = &sNotify;
    camera3_callback_ops::process_capture_result = &sProcessCaptureResult;
    ALOGV("%s: Created device for camera %d", __FUNCTION__, id);
}

Camera3Device::~Camera3Device()
{
    ATRACE_CALL();
    ALOGV("%s: Tearing down for camera id %d", __FUNCTION__, mId);
    disconnect();
}

int Camera3Device::getId() const {
    return mId;
}

/**
 * CameraDeviceBase interface
 */

status_t Camera3Device::initialize(camera_module_t *module)
{
    ATRACE_CALL();
    Mutex::Autolock l(mLock);

    ALOGV("%s: Initializing device for camera %d", __FUNCTION__, mId);
    if (mStatus != STATUS_UNINITIALIZED) {
        ALOGE("%s: Already initialized!", __FUNCTION__);
        return INVALID_OPERATION;
    }

    /** Open HAL device */

    status_t res;
    String8 deviceName = String8::format("%d", mId);

    camera3_device_t *device;

    res = module->common.methods->open(&module->common, deviceName.string(),
            reinterpret_cast<hw_device_t**>(&device));

    if (res != OK) {
        ALOGE("%s: Could not open camera %d: %s (%d)", __FUNCTION__,
                mId, strerror(-res), res);
        mStatus = STATUS_ERROR;
        return res;
    }

    /** Cross-check device version */

    if (device->common.version != CAMERA_DEVICE_API_VERSION_3_0) {
        ALOGE("%s: Could not open camera %d: "
                "Camera device is not version %x, reports %x instead",
                __FUNCTION__, mId, CAMERA_DEVICE_API_VERSION_3_0,
                device->common.version);
        device->common.close(&device->common);
        mStatus = STATUS_ERROR;
        return BAD_VALUE;
    }

    camera_info info;
    res = module->get_camera_info(mId, &info);
    if (res != OK) return res;

    if (info.device_version != device->common.version) {
        ALOGE("%s: HAL reporting mismatched camera_info version (%x)"
                " and device version (%x).", __FUNCTION__,
                device->common.version, info.device_version);
        device->common.close(&device->common);
        mStatus = STATUS_ERROR;
        return BAD_VALUE;
    }

    /** Initialize device with callback functions */

    res = device->ops->initialize(device, this);
    if (res != OK) {
        ALOGE("%s: Camera %d: Unable to initialize HAL device: %s (%d)",
                __FUNCTION__, mId, strerror(-res), res);
        device->common.close(&device->common);
        mStatus = STATUS_ERROR;
        return BAD_VALUE;
    }

    /** Get vendor metadata tags */

    mVendorTagOps.get_camera_vendor_section_name = NULL;

    device->ops->get_metadata_vendor_tag_ops(device, &mVendorTagOps);

    if (mVendorTagOps.get_camera_vendor_section_name != NULL) {
        res = set_camera_metadata_vendor_tag_ops(&mVendorTagOps);
        if (res != OK) {
            ALOGE("%s: Camera %d: Unable to set tag ops: %s (%d)",
                    __FUNCTION__, mId, strerror(-res), res);
            device->common.close(&device->common);
            mStatus = STATUS_ERROR;
            return res;
        }
    }

    /** Start up request queue thread */

    mRequestThread = new RequestThread(this, device);
    res = mRequestThread->run(String8::format("C3Dev-%d-ReqQueue", mId).string());
    if (res != OK) {
        ALOGE("%s: Camera %d: Unable to start request queue thread: %s (%d)",
                __FUNCTION__, mId, strerror(-res), res);
        device->common.close(&device->common);
        mRequestThread.clear();
        mStatus = STATUS_ERROR;
        return res;
    }

    /** Everything is good to go */

    mDeviceInfo = info.static_camera_characteristics;
    mHal3Device = device;
    mStatus = STATUS_IDLE;
    mNextStreamId = 0;

    return OK;
}

status_t Camera3Device::disconnect() {
    ATRACE_CALL();
    Mutex::Autolock l(mLock);

    ALOGV("%s: E", __FUNCTION__);

    status_t res;
    if (mStatus == STATUS_UNINITIALIZED) return OK;

    if (mStatus == STATUS_ACTIVE ||
            (mStatus == STATUS_ERROR && mRequestThread != NULL)) {
        res = mRequestThread->clearRepeatingRequests();
        if (res != OK) {
            ALOGE("%s: Can't stop streaming", __FUNCTION__);
            return res;
        }
        res = waitUntilDrainedLocked();
        if (res != OK) {
            ALOGE("%s: Timeout waiting for HAL to drain", __FUNCTION__);
            return res;
        }
    }
    assert(mStatus == STATUS_IDLE || mStatus == STATUS_ERROR);

    if (mRequestThread != NULL) {
        mRequestThread->requestExit();
    }

    mOutputStreams.clear();
    mInputStream.clear();

    if (mRequestThread != NULL) {
        mRequestThread->join();
        mRequestThread.clear();
    }

    if (mHal3Device != NULL) {
        mHal3Device->common.close(&mHal3Device->common);
        mHal3Device = NULL;
    }

    mStatus = STATUS_UNINITIALIZED;

    ALOGV("%s: X", __FUNCTION__);
    return OK;
}

status_t Camera3Device::dump(int fd, const Vector<String16> &args) {
    ATRACE_CALL();
    (void)args;
    String8 lines;

    const char *status =
            mStatus == STATUS_ERROR         ? "ERROR" :
            mStatus == STATUS_UNINITIALIZED ? "UNINITIALIZED" :
            mStatus == STATUS_IDLE          ? "IDLE" :
            mStatus == STATUS_ACTIVE        ? "ACTIVE" :
            "Unknown";
    lines.appendFormat("    Device status: %s\n", status);
    lines.appendFormat("    Stream configuration:\n");

    if (mInputStream != NULL) {
        write(fd, lines.string(), lines.size());
        mInputStream->dump(fd, args);
    } else {
        lines.appendFormat("      No input stream.\n");
        write(fd, lines.string(), lines.size());
    }
    for (size_t i = 0; i < mOutputStreams.size(); i++) {
        mOutputStreams[i]->dump(fd,args);
    }

    if (mHal3Device != NULL) {
        lines = String8("     HAL device dump:\n");
        write(fd, lines.string(), lines.size());
        mHal3Device->ops->dump(mHal3Device, fd);
    }

    return OK;
}

const CameraMetadata& Camera3Device::info() const {
    ALOGVV("%s: E", __FUNCTION__);
    if (CC_UNLIKELY(mStatus == STATUS_UNINITIALIZED ||
                    mStatus == STATUS_ERROR)) {
        ALOGE("%s: Access to static info %s!", __FUNCTION__,
                mStatus == STATUS_ERROR ?
                "when in error state" : "before init");
    }
    return mDeviceInfo;
}

status_t Camera3Device::capture(CameraMetadata &request) {
    ATRACE_CALL();
    Mutex::Autolock l(mLock);

    switch (mStatus) {
        case STATUS_ERROR:
            ALOGE("%s: Device has encountered a serious error", __FUNCTION__);
            return INVALID_OPERATION;
        case STATUS_UNINITIALIZED:
            ALOGE("%s: Device not initialized", __FUNCTION__);
            return INVALID_OPERATION;
        case STATUS_IDLE:
        case STATUS_ACTIVE:
            // OK
            break;
        default:
            ALOGE("%s: Unexpected status: %d", __FUNCTION__, mStatus);
            return INVALID_OPERATION;
    }

    sp<CaptureRequest> newRequest = setUpRequestLocked(request);
    if (newRequest == NULL) {
        ALOGE("%s: Can't create capture request", __FUNCTION__);
        return BAD_VALUE;
    }

    return mRequestThread->queueRequest(newRequest);
}


status_t Camera3Device::setStreamingRequest(const CameraMetadata &request) {
    ATRACE_CALL();
    Mutex::Autolock l(mLock);

    switch (mStatus) {
        case STATUS_ERROR:
            ALOGE("%s: Device has encountered a serious error", __FUNCTION__);
            return INVALID_OPERATION;
        case STATUS_UNINITIALIZED:
            ALOGE("%s: Device not initialized", __FUNCTION__);
            return INVALID_OPERATION;
        case STATUS_IDLE:
        case STATUS_ACTIVE:
            // OK
            break;
        default:
            ALOGE("%s: Unexpected status: %d", __FUNCTION__, mStatus);
            return INVALID_OPERATION;
    }

    sp<CaptureRequest> newRepeatingRequest = setUpRequestLocked(request);
    if (newRepeatingRequest == NULL) {
        ALOGE("%s: Can't create repeating request", __FUNCTION__);
        return BAD_VALUE;
    }

    RequestList newRepeatingRequests;
    newRepeatingRequests.push_back(newRepeatingRequest);

    return mRequestThread->setRepeatingRequests(newRepeatingRequests);
}


sp<Camera3Device::CaptureRequest> Camera3Device::setUpRequestLocked(
        const CameraMetadata &request) {
    status_t res;

    if (mStatus == STATUS_IDLE) {
        res = configureStreamsLocked();
        if (res != OK) {
            ALOGE("%s: Can't set up streams: %s (%d)",
                    __FUNCTION__, strerror(-res), res);
            return NULL;
        }
    }

    sp<CaptureRequest> newRequest = createCaptureRequest(request);
    return newRequest;
}

status_t Camera3Device::clearStreamingRequest() {
    ATRACE_CALL();
    Mutex::Autolock l(mLock);

    switch (mStatus) {
        case STATUS_ERROR:
            ALOGE("%s: Device has encountered a serious error", __FUNCTION__);
            return INVALID_OPERATION;
        case STATUS_UNINITIALIZED:
            ALOGE("%s: Device not initialized", __FUNCTION__);
            return INVALID_OPERATION;
        case STATUS_IDLE:
        case STATUS_ACTIVE:
            // OK
            break;
        default:
            ALOGE("%s: Unexpected status: %d", __FUNCTION__, mStatus);
            return INVALID_OPERATION;
    }

    return mRequestThread->clearRepeatingRequests();
}

status_t Camera3Device::waitUntilRequestReceived(int32_t requestId, nsecs_t timeout) {
    ATRACE_CALL();
    (void)requestId; (void)timeout;

    ALOGE("%s: Unimplemented", __FUNCTION__);
    return INVALID_OPERATION;
}

status_t Camera3Device::createStream(sp<ANativeWindow> consumer,
        uint32_t width, uint32_t height, int format, size_t size, int *id) {
    ATRACE_CALL();
    Mutex::Autolock l(mLock);

    status_t res;
    bool wasActive = false;

    switch (mStatus) {
        case STATUS_ERROR:
            ALOGE("%s: Device has encountered a serious error", __FUNCTION__);
            return INVALID_OPERATION;
        case STATUS_UNINITIALIZED:
            ALOGE("%s: Device not initialized", __FUNCTION__);
            return INVALID_OPERATION;
        case STATUS_IDLE:
            // OK
            break;
        case STATUS_ACTIVE:
            ALOGV("%s: Stopping activity to reconfigure streams", __FUNCTION__);
            mRequestThread->setPaused(true);
            res = waitUntilDrainedLocked();
            if (res != OK) {
                ALOGE("%s: Can't pause captures to reconfigure streams!",
                        __FUNCTION__);
                mStatus = STATUS_ERROR;
                return res;
            }
            wasActive = true;
            break;
        default:
            ALOGE("%s: Unexpected status: %d", __FUNCTION__, mStatus);
            return INVALID_OPERATION;
    }
    assert(mStatus == STATUS_IDLE);

    sp<Camera3OutputStream> newStream;
    if (format == HAL_PIXEL_FORMAT_BLOB) {
        newStream = new Camera3OutputStream(mNextStreamId, consumer,
                width, height, size, format);
    } else {
        newStream = new Camera3OutputStream(mNextStreamId, consumer,
                width, height, format);
    }

    res = mOutputStreams.add(mNextStreamId, newStream);
    if (res < 0) {
        ALOGE("%s: Can't add new stream to set: %s (%d)",
                __FUNCTION__, strerror(-res), res);
        return res;
    }

    *id = mNextStreamId++;

    // Continue captures if active at start
    if (wasActive) {
        ALOGV("%s: Restarting activity to reconfigure streams", __FUNCTION__);
        res = configureStreamsLocked();
        if (res != OK) {
            ALOGE("%s: Can't reconfigure device for new stream %d: %s (%d)",
                    __FUNCTION__, mNextStreamId, strerror(-res), res);
            return res;
        }
        mRequestThread->setPaused(false);
    }

    return OK;
}

status_t Camera3Device::createReprocessStreamFromStream(int outputId, int *id) {
    ATRACE_CALL();
    (void)outputId; (void)id;

    ALOGE("%s: Unimplemented", __FUNCTION__);
    return INVALID_OPERATION;
}


status_t Camera3Device::getStreamInfo(int id,
        uint32_t *width, uint32_t *height, uint32_t *format) {
    ATRACE_CALL();
    Mutex::Autolock l(mLock);

    switch (mStatus) {
        case STATUS_ERROR:
            ALOGE("%s: Device has encountered a serious error", __FUNCTION__);
            return INVALID_OPERATION;
        case STATUS_UNINITIALIZED:
            ALOGE("%s: Device not initialized!", __FUNCTION__);
            return INVALID_OPERATION;
        case STATUS_IDLE:
        case STATUS_ACTIVE:
            // OK
            break;
        default:
            ALOGE("%s: Unexpected status: %d", __FUNCTION__, mStatus);
            return INVALID_OPERATION;
    }

    ssize_t idx = mOutputStreams.indexOfKey(id);
    if (idx == NAME_NOT_FOUND) {
        ALOGE("%s: Stream %d is unknown", __FUNCTION__, id);
        return idx;
    }

    if (width) *width  = mOutputStreams[idx]->getWidth();
    if (height) *height = mOutputStreams[idx]->getHeight();
    if (format) *format = mOutputStreams[idx]->getFormat();

    return OK;
}

status_t Camera3Device::setStreamTransform(int id,
        int transform) {
    ATRACE_CALL();
    Mutex::Autolock l(mLock);

    switch (mStatus) {
        case STATUS_ERROR:
            ALOGE("%s: Device has encountered a serious error", __FUNCTION__);
            return INVALID_OPERATION;
        case STATUS_UNINITIALIZED:
            ALOGE("%s: Device not initialized", __FUNCTION__);
            return INVALID_OPERATION;
        case STATUS_IDLE:
        case STATUS_ACTIVE:
            // OK
            break;
        default:
            ALOGE("%s: Unexpected status: %d", __FUNCTION__, mStatus);
            return INVALID_OPERATION;
    }

    ssize_t idx = mOutputStreams.indexOfKey(id);
    if (idx == NAME_NOT_FOUND) {
        ALOGE("%s: Stream %d does not exist",
                __FUNCTION__, id);
        return BAD_VALUE;
    }

    return mOutputStreams.editValueAt(idx)->setTransform(transform);
}

status_t Camera3Device::deleteStream(int id) {
    ATRACE_CALL();
    Mutex::Autolock l(mLock);
    status_t res;

    // CameraDevice semantics require device to already be idle before
    // deleteStream is called, unlike for createStream.
    if (mStatus != STATUS_IDLE) {
        ALOGE("%s: Device not idle", __FUNCTION__);
        return INVALID_OPERATION;
    }

    sp<Camera3Stream> deletedStream;
    if (mInputStream != NULL && id == mInputStream->getId()) {
        deletedStream = mInputStream;
        mInputStream.clear();
    } else {
        ssize_t idx = mOutputStreams.indexOfKey(id);
        if (idx == NAME_NOT_FOUND) {
            ALOGE("%s: Stream %d does not exist",
                    __FUNCTION__, id);
            return BAD_VALUE;
        }
        deletedStream = mOutputStreams.editValueAt(idx);
        mOutputStreams.removeItem(id);
    }

    // Free up the stream endpoint so that it can be used by some other stream
    res = deletedStream->disconnect();
    if (res != OK) {
        ALOGE("%s: Can't disconnect deleted stream", __FUNCTION__);
        // fall through since we want to still list the stream as deleted.
    }
    mDeletedStreams.add(deletedStream);

    return res;
}

status_t Camera3Device::deleteReprocessStream(int id) {
    ATRACE_CALL();
    (void)id;

    ALOGE("%s: Unimplemented", __FUNCTION__);
    return INVALID_OPERATION;
}


status_t Camera3Device::createDefaultRequest(int templateId,
        CameraMetadata *request) {
    ATRACE_CALL();
    ALOGV("%s: E", __FUNCTION__);
    Mutex::Autolock l(mLock);

    switch (mStatus) {
        case STATUS_ERROR:
            ALOGE("%s: Device has encountered a serious error", __FUNCTION__);
            return INVALID_OPERATION;
        case STATUS_UNINITIALIZED:
            ALOGE("%s: Device is not initialized!", __FUNCTION__);
            return INVALID_OPERATION;
        case STATUS_IDLE:
        case STATUS_ACTIVE:
            // OK
            break;
        default:
            ALOGE("%s: Unexpected status: %d", __FUNCTION__, mStatus);
            return INVALID_OPERATION;
    }

    const camera_metadata_t *rawRequest;
    rawRequest = mHal3Device->ops->construct_default_request_settings(
        mHal3Device, templateId);
    if (rawRequest == NULL) return DEAD_OBJECT;
    *request = rawRequest;

    return OK;
}

status_t Camera3Device::waitUntilDrained() {
    ATRACE_CALL();
    Mutex::Autolock l(mLock);

    return waitUntilDrainedLocked();
}

status_t Camera3Device::waitUntilDrainedLocked() {
    ATRACE_CALL();
    status_t res;

    switch (mStatus) {
        case STATUS_UNINITIALIZED:
        case STATUS_IDLE:
            ALOGV("%s: Already idle", __FUNCTION__);
            return OK;
        case STATUS_ERROR:
        case STATUS_ACTIVE:
            // Need to shut down
            break;
        default:
            ALOGE("%s: Unexpected status: %d", __FUNCTION__, mStatus);
            return INVALID_OPERATION;
    }

    if (mRequestThread != NULL) {
        res = mRequestThread->waitUntilPaused(kShutdownTimeout);
        if (res != OK) {
            ALOGE("%s: Can't stop request thread in %f seconds!",
                    __FUNCTION__, kShutdownTimeout/1e9);
            mStatus = STATUS_ERROR;
            return res;
        }
    }
    if (mInputStream != NULL) {
        res = mInputStream->waitUntilIdle(kShutdownTimeout);
        if (res != OK) {
            ALOGE("%s: Can't idle input stream %d in %f seconds!",
                    __FUNCTION__, mInputStream->getId(), kShutdownTimeout/1e9);
            mStatus = STATUS_ERROR;
            return res;
        }
    }
    for (size_t i = 0; i < mOutputStreams.size(); i++) {
        res = mOutputStreams.editValueAt(i)->waitUntilIdle(kShutdownTimeout);
        if (res != OK) {
            ALOGE("%s: Can't idle output stream %d in %f seconds!",
                    __FUNCTION__, mOutputStreams.keyAt(i),
                    kShutdownTimeout/1e9);
            mStatus = STATUS_ERROR;
            return res;
        }
    }

    if (mStatus != STATUS_ERROR) {
        mStatus = STATUS_IDLE;
    }

    return OK;
}

status_t Camera3Device::setNotifyCallback(NotificationListener *listener) {
    ATRACE_CALL();
    (void)listener;

    ALOGE("%s: Unimplemented", __FUNCTION__);
    return INVALID_OPERATION;
}

status_t Camera3Device::waitForNextFrame(nsecs_t timeout) {
    (void)timeout;

    ALOGE("%s: Unimplemented", __FUNCTION__);
    return INVALID_OPERATION;
}

status_t Camera3Device::getNextFrame(CameraMetadata *frame) {
    ATRACE_CALL();
    (void)frame;

    ALOGE("%s: Unimplemented", __FUNCTION__);
    return INVALID_OPERATION;
}

status_t Camera3Device::triggerAutofocus(uint32_t id) {
    ATRACE_CALL();
    (void)id;


    ALOGE("%s: Unimplemented", __FUNCTION__);
    return INVALID_OPERATION;
}

status_t Camera3Device::triggerCancelAutofocus(uint32_t id) {
    ATRACE_CALL();
    (void)id;

    ALOGE("%s: Unimplemented", __FUNCTION__);
    return INVALID_OPERATION;

}

status_t Camera3Device::triggerPrecaptureMetering(uint32_t id) {
    ATRACE_CALL();
    (void)id;

    ALOGE("%s: Unimplemented", __FUNCTION__);
    return INVALID_OPERATION;

}

status_t Camera3Device::pushReprocessBuffer(int reprocessStreamId,
        buffer_handle_t *buffer, wp<BufferReleasedListener> listener) {
    ATRACE_CALL();
    (void)reprocessStreamId; (void)buffer; (void)listener;

    ALOGE("%s: Unimplemented", __FUNCTION__);
    return INVALID_OPERATION;
}

/**
 * Camera3Device private methods
 */

sp<Camera3Device::CaptureRequest> Camera3Device::createCaptureRequest(
        const CameraMetadata &request) {
    ATRACE_CALL();
    status_t res;

    sp<CaptureRequest> newRequest = new CaptureRequest;
    newRequest->mSettings = request;

    camera_metadata_entry_t inputStreams =
            newRequest->mSettings.find(ANDROID_REQUEST_INPUT_STREAMS);
    if (inputStreams.count > 0) {
        if (mInputStream == NULL ||
                mInputStream->getId() != inputStreams.data.u8[0]) {
            ALOGE("%s: Request references unknown input stream %d",
                    __FUNCTION__, inputStreams.data.u8[0]);
            return NULL;
        }
        // Lazy completion of stream configuration (allocation/registration)
        // on first use
        if (mInputStream->isConfiguring()) {
            res = mInputStream->finishConfiguration(mHal3Device);
            if (res != OK) {
                ALOGE("%s: Unable to finish configuring input stream %d:"
                        " %s (%d)",
                        __FUNCTION__, mInputStream->getId(),
                        strerror(-res), res);
                return NULL;
            }
        }

        newRequest->mInputStream = mInputStream;
        newRequest->mSettings.erase(ANDROID_REQUEST_INPUT_STREAMS);
    }

    camera_metadata_entry_t streams =
            newRequest->mSettings.find(ANDROID_REQUEST_OUTPUT_STREAMS);
    if (streams.count == 0) {
        ALOGE("%s: Zero output streams specified!", __FUNCTION__);
        return NULL;
    }

    for (size_t i = 0; i < streams.count; i++) {
        int idx = mOutputStreams.indexOfKey(streams.data.u8[i]);
        if (idx == NAME_NOT_FOUND) {
            ALOGE("%s: Request references unknown stream %d",
                    __FUNCTION__, streams.data.u8[i]);
            return NULL;
        }
        sp<Camera3OutputStream> stream = mOutputStreams.editValueAt(idx);

        // Lazy completion of stream configuration (allocation/registration)
        // on first use
        if (stream->isConfiguring()) {
            res = stream->finishConfiguration(mHal3Device);
            if (res != OK) {
                ALOGE("%s: Unable to finish configuring stream %d: %s (%d)",
                        __FUNCTION__, stream->getId(), strerror(-res), res);
                return NULL;
            }
        }

        newRequest->mOutputStreams.push(stream);
    }
    newRequest->mSettings.erase(ANDROID_REQUEST_OUTPUT_STREAMS);

    return newRequest;
}

status_t Camera3Device::configureStreamsLocked() {
    ATRACE_CALL();
    status_t res;

    if (mStatus != STATUS_IDLE) {
        ALOGE("%s: Not idle", __FUNCTION__);
        return INVALID_OPERATION;
    }

    // Start configuring the streams

    camera3_stream_configuration config;

    config.num_streams = (mInputStream != NULL) + mOutputStreams.size();

    Vector<camera3_stream_t*> streams;
    streams.setCapacity(config.num_streams);

    if (mInputStream != NULL) {
        camera3_stream_t *inputStream;
        inputStream = mInputStream->startConfiguration();
        if (inputStream == NULL) {
            ALOGE("%s: Can't start input stream configuration",
                    __FUNCTION__);
            // TODO: Make sure the error flow here is correct
            return INVALID_OPERATION;
        }
        streams.add(inputStream);
    }

    for (size_t i = 0; i < mOutputStreams.size(); i++) {
        camera3_stream_t *outputStream;
        outputStream = mOutputStreams.editValueAt(i)->startConfiguration();
        if (outputStream == NULL) {
            ALOGE("%s: Can't start output stream configuration",
                    __FUNCTION__);
            // TODO: Make sure the error flow here is correct
            return INVALID_OPERATION;
        }
        streams.add(outputStream);
    }

    config.streams = streams.editArray();

    // Do the HAL configuration; will potentially touch stream
    // max_buffers, usage, priv fields.

    res = mHal3Device->ops->configure_streams(mHal3Device, &config);

    if (res != OK) {
        ALOGE("%s: Unable to configure streams with HAL: %s (%d)",
                __FUNCTION__, strerror(-res), res);
        return res;
    }

    // Request thread needs to know to avoid using repeat-last-settings protocol
    // across configure_streams() calls
    mRequestThread->configurationComplete();

    // Finish configuring the streams lazily on first reference

    mStatus = STATUS_ACTIVE;

    return OK;
}


/**
 * Camera HAL device callback methods
 */

void Camera3Device::processCaptureResult(const camera3_capture_result *result) {
    (void)result;

    ALOGE("%s: Unimplemented", __FUNCTION__);
}

void Camera3Device::notify(const camera3_notify_msg *msg) {
    (void)msg;

    ALOGE("%s: Unimplemented", __FUNCTION__);
}

/**
 * RequestThread inner class methods
 */

Camera3Device::RequestThread::RequestThread(wp<Camera3Device> parent,
        camera3_device_t *hal3Device) :
        Thread(false),
        mParent(parent),
        mHal3Device(hal3Device),
        mReconfigured(false),
        mDoPause(false),
        mPaused(true),
        mFrameNumber(0) {
}

void Camera3Device::RequestThread::configurationComplete() {
    Mutex::Autolock l(mRequestLock);
    mReconfigured = true;
}

status_t Camera3Device::RequestThread::queueRequest(
         sp<CaptureRequest> request) {
    Mutex::Autolock l(mRequestLock);
    mRequestQueue.push_back(request);

    return OK;
}

status_t Camera3Device::RequestThread::setRepeatingRequests(
        const RequestList &requests) {
    Mutex::Autolock l(mRequestLock);
    mRepeatingRequests.clear();
    mRepeatingRequests.insert(mRepeatingRequests.begin(),
            requests.begin(), requests.end());
    return OK;
}

status_t Camera3Device::RequestThread::clearRepeatingRequests() {
    Mutex::Autolock l(mRequestLock);
    mRepeatingRequests.clear();
    return OK;
}

void Camera3Device::RequestThread::setPaused(bool paused) {
    Mutex::Autolock l(mPauseLock);
    mDoPause = paused;
    mDoPauseSignal.signal();
}

status_t Camera3Device::RequestThread::waitUntilPaused(nsecs_t timeout) {
    status_t res;
    Mutex::Autolock l(mPauseLock);
    while (!mPaused) {
        res = mPausedSignal.waitRelative(mPauseLock, timeout);
        if (res == TIMED_OUT) {
            return res;
        }
    }
    return OK;
}

bool Camera3Device::RequestThread::threadLoop() {

    status_t res;

    // Handle paused state.
    if (waitIfPaused()) {
        return true;
    }

    // Get work to do

    sp<CaptureRequest> nextRequest = waitForNextRequest();
    if (nextRequest == NULL) {
        return true;
    }

    // Create request to HAL

    camera3_capture_request_t request = camera3_capture_request_t();

    if (mPrevRequest != nextRequest) {
        request.settings = nextRequest->mSettings.getAndLock();
        mPrevRequest = nextRequest;
    } // else leave request.settings NULL to indicate 'reuse latest given'

    camera3_stream_buffer_t inputBuffer;
    Vector<camera3_stream_buffer_t> outputBuffers;

    // Fill in buffers

    if (nextRequest->mInputStream != NULL) {
        request.input_buffer = &inputBuffer;
        res = nextRequest->mInputStream->getBuffer(&inputBuffer);
        if (res != OK) {
            ALOGE("RequestThread: Can't get input buffer, skipping request:"
                    " %s (%d)", strerror(-res), res);
            cleanUpFailedRequest(request, nextRequest, outputBuffers);
            return true;
        }
    } else {
        request.input_buffer = NULL;
    }

    outputBuffers.insertAt(camera3_stream_buffer_t(), 0,
            nextRequest->mOutputStreams.size());
    request.output_buffers = outputBuffers.array();
    for (size_t i = 0; i < nextRequest->mOutputStreams.size(); i++) {
        res = nextRequest->mOutputStreams.editItemAt(i)->
                getBuffer(&outputBuffers.editItemAt(i));
        if (res != OK) {
            ALOGE("RequestThread: Can't get output buffer, skipping request:"
                    "%s (%d)", strerror(-res), res);
            cleanUpFailedRequest(request, nextRequest, outputBuffers);
            return true;
        }
        request.num_output_buffers++;
    }

    request.frame_number = mFrameNumber++;

    // Submit request and block until ready for next one

    res = mHal3Device->ops->process_capture_request(mHal3Device, &request);
    if (res != OK) {
        ALOGE("RequestThread: Unable to submit capture request %d to HAL"
                " device: %s (%d)", request.frame_number, strerror(-res), res);
        cleanUpFailedRequest(request, nextRequest, outputBuffers);
        return false;
    }

    if (request.settings != NULL) {
        nextRequest->mSettings.unlock(request.settings);
    }
    return true;
}

void Camera3Device::RequestThread::cleanUpFailedRequest(
        camera3_capture_request_t &request,
        sp<CaptureRequest> &nextRequest,
        Vector<camera3_stream_buffer_t> &outputBuffers) {

    if (request.settings != NULL) {
        nextRequest->mSettings.unlock(request.settings);
    }
    if (request.input_buffer != NULL) {
        request.input_buffer->status = CAMERA3_BUFFER_STATUS_ERROR;
        nextRequest->mInputStream->returnBuffer(*(request.input_buffer), 0);
    }
    for (size_t i = 0; i < request.num_output_buffers; i++) {
        outputBuffers.editItemAt(i).status = CAMERA3_BUFFER_STATUS_ERROR;
        nextRequest->mOutputStreams.editItemAt(i)->returnBuffer(
            outputBuffers[i], 0);
    }
    // TODO: Report error upstream
}

sp<Camera3Device::CaptureRequest>
        Camera3Device::RequestThread::waitForNextRequest() {
    status_t res;
    sp<CaptureRequest> nextRequest;

    // Optimized a bit for the simple steady-state case (single repeating
    // request), to avoid putting that request in the queue temporarily.
    Mutex::Autolock l(mRequestLock);

    while (mRequestQueue.empty()) {
        if (!mRepeatingRequests.empty()) {
            // Always atomically enqueue all requests in a repeating request
            // list. Guarantees a complete in-sequence set of captures to
            // application.
            const RequestList &requests = mRepeatingRequests;
            RequestList::const_iterator firstRequest =
                    requests.begin();
            nextRequest = *firstRequest;
            mRequestQueue.insert(mRequestQueue.end(),
                    ++firstRequest,
                    requests.end());
            // No need to wait any longer
            break;
        }

        res = mRequestSignal.waitRelative(mRequestLock, kRequestTimeout);

        if (res == TIMED_OUT) {
            // Signal that we're paused by starvation
            Mutex::Autolock pl(mPauseLock);
            if (mPaused == false) {
                mPaused = true;
                mPausedSignal.signal();
            }
            // Stop waiting for now and let thread management happen
            return NULL;
        }
    }

    if (nextRequest == NULL) {
        // Don't have a repeating request already in hand, so queue
        // must have an entry now.
        RequestList::iterator firstRequest =
                mRequestQueue.begin();
        nextRequest = *firstRequest;
        mRequestQueue.erase(firstRequest);
    }

    // Not paused
    Mutex::Autolock pl(mPauseLock);
    mPaused = false;

    // Check if we've reconfigured since last time, and reset the preview
    // request if so. Can't use 'NULL request == repeat' across configure calls.
    if (mReconfigured) {
        mPrevRequest.clear();
        mReconfigured = false;
    }

    return nextRequest;
}

bool Camera3Device::RequestThread::waitIfPaused() {
    status_t res;
    Mutex::Autolock l(mPauseLock);
    while (mDoPause) {
        // Signal that we're paused by request
        if (mPaused == false) {
            mPaused = true;
            mPausedSignal.signal();
        }
        res = mDoPauseSignal.waitRelative(mPauseLock, kRequestTimeout);
        if (res == TIMED_OUT) {
            return true;
        }
    }
    // We don't set mPaused to false here, because waitForNextRequest needs
    // to further manage the paused state in case of starvation.
    return false;
}

/**
 * Static callback forwarding methods from HAL to instance
 */

void Camera3Device::sProcessCaptureResult(const camera3_callback_ops *cb,
        const camera3_capture_result *result) {
    Camera3Device *d =
            const_cast<Camera3Device*>(static_cast<const Camera3Device*>(cb));
    d->processCaptureResult(result);
}

void Camera3Device::sNotify(const camera3_callback_ops *cb,
        const camera3_notify_msg *msg) {
    Camera3Device *d =
            const_cast<Camera3Device*>(static_cast<const Camera3Device*>(cb));
    d->notify(msg);
}

}; // namespace android