/*
* Copyright (C) 2010 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 ANDROID_GUI_IGRAPHICBUFFERPRODUCER_H
#define ANDROID_GUI_IGRAPHICBUFFERPRODUCER_H
#include <stdint.h>
#include <sys/types.h>
#include <utils/Errors.h>
#include <utils/RefBase.h>
#include <binder/IInterface.h>
#include <ui/Fence.h>
#include <ui/GraphicBuffer.h>
#include <ui/Rect.h>
#include <ui/Region.h>
#include <gui/FrameTimestamps.h>
#include <hidl/HybridInterface.h>
#include <android/hardware/graphics/bufferqueue/1.0/IGraphicBufferProducer.h>
namespace android {
// ----------------------------------------------------------------------------
class IProducerListener;
class NativeHandle;
class Surface;
typedef ::android::hardware::graphics::bufferqueue::V1_0::IGraphicBufferProducer
HGraphicBufferProducer;
/*
* This class defines the Binder IPC interface for the producer side of
* a queue of graphics buffers. It's used to send graphics data from one
* component to another. For example, a class that decodes video for
* playback might use this to provide frames. This is typically done
* indirectly, through Surface.
*
* The underlying mechanism is a BufferQueue, which implements
* BnGraphicBufferProducer. In normal operation, the producer calls
* dequeueBuffer() to get an empty buffer, fills it with data, then
* calls queueBuffer() to make it available to the consumer.
*
* This class was previously called ISurfaceTexture.
*/
class IGraphicBufferProducer : public IInterface
{
public:
DECLARE_HYBRID_META_INTERFACE(GraphicBufferProducer, HGraphicBufferProducer)
enum {
// A flag returned by dequeueBuffer when the client needs to call
// requestBuffer immediately thereafter.
BUFFER_NEEDS_REALLOCATION = 0x1,
// A flag returned by dequeueBuffer when all mirrored slots should be
// released by the client. This flag should always be processed first.
RELEASE_ALL_BUFFERS = 0x2,
};
// requestBuffer requests a new buffer for the given index. The server (i.e.
// the IGraphicBufferProducer implementation) assigns the newly created
// buffer to the given slot index, and the client is expected to mirror the
// slot->buffer mapping so that it's not necessary to transfer a
// GraphicBuffer for every dequeue operation.
//
// The slot must be in the range of [0, NUM_BUFFER_SLOTS).
//
// Return of a value other than NO_ERROR means an error has occurred:
// * NO_INIT - the buffer queue has been abandoned or the producer is not
// connected.
// * BAD_VALUE - one of the two conditions occurred:
// * slot was out of range (see above)
// * buffer specified by the slot is not dequeued
virtual status_t requestBuffer(int slot, sp<GraphicBuffer>* buf) = 0;
// setMaxDequeuedBufferCount sets the maximum number of buffers that can be
// dequeued by the producer at one time. If this method succeeds, any new
// buffer slots will be both unallocated and owned by the BufferQueue object
// (i.e. they are not owned by the producer or consumer). Calling this may
// also cause some buffer slots to be emptied. If the caller is caching the
// contents of the buffer slots, it should empty that cache after calling
// this method.
//
// This function should not be called with a value of maxDequeuedBuffers
// that is less than the number of currently dequeued buffer slots. Doing so
// will result in a BAD_VALUE error.
//
// The buffer count should be at least 1 (inclusive), but at most
// (NUM_BUFFER_SLOTS - the minimum undequeued buffer count) (exclusive). The
// minimum undequeued buffer count can be obtained by calling
// query(NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS).
//
// Return of a value other than NO_ERROR means an error has occurred:
// * NO_INIT - the buffer queue has been abandoned.
// * BAD_VALUE - one of the below conditions occurred:
// * bufferCount was out of range (see above).
// * client would have more than the requested number of dequeued
// buffers after this call.
// * this call would cause the maxBufferCount value to be exceeded.
// * failure to adjust the number of available slots.
virtual status_t setMaxDequeuedBufferCount(int maxDequeuedBuffers) = 0;
// Set the async flag if the producer intends to asynchronously queue
// buffers without blocking. Typically this is used for triple-buffering
// and/or when the swap interval is set to zero.
//
// Enabling async mode will internally allocate an additional buffer to
// allow for the asynchronous behavior. If it is not enabled queue/dequeue
// calls may block.
//
// Return of a value other than NO_ERROR means an error has occurred:
// * NO_INIT - the buffer queue has been abandoned.
// * BAD_VALUE - one of the following has occurred:
// * this call would cause the maxBufferCount value to be
// exceeded
// * failure to adjust the number of available slots.
virtual status_t setAsyncMode(bool async) = 0;
// dequeueBuffer requests a new buffer slot for the client to use. Ownership
// of the slot is transfered to the client, meaning that the server will not
// use the contents of the buffer associated with that slot.
//
// The slot index returned may or may not contain a buffer (client-side).
// If the slot is empty the client should call requestBuffer to assign a new
// buffer to that slot.
//
// Once the client is done filling this buffer, it is expected to transfer
// buffer ownership back to the server with either cancelBuffer on
// the dequeued slot or to fill in the contents of its associated buffer
// contents and call queueBuffer.
//
// If dequeueBuffer returns the BUFFER_NEEDS_REALLOCATION flag, the client is
// expected to call requestBuffer immediately.
//
// If dequeueBuffer returns the RELEASE_ALL_BUFFERS flag, the client is
// expected to release all of the mirrored slot->buffer mappings.
//
// The fence parameter will be updated to hold the fence associated with
// the buffer. The contents of the buffer must not be overwritten until the
// fence signals. If the fence is Fence::NO_FENCE, the buffer may be written
// immediately.
//
// The width and height parameters must be no greater than the minimum of
// GL_MAX_VIEWPORT_DIMS and GL_MAX_TEXTURE_SIZE (see: glGetIntegerv).
// An error due to invalid dimensions might not be reported until
// updateTexImage() is called. If width and height are both zero, the
// default values specified by setDefaultBufferSize() are used instead.
//
// If the format is 0, the default format will be used.
//
// The usage argument specifies gralloc buffer usage flags. The values
// are enumerated in <gralloc.h>, e.g. GRALLOC_USAGE_HW_RENDER. These
// will be merged with the usage flags specified by
// IGraphicBufferConsumer::setConsumerUsageBits.
//
// This call will block until a buffer is available to be dequeued. If
// both the producer and consumer are controlled by the app, then this call
// can never block and will return WOULD_BLOCK if no buffer is available.
//
// A non-negative value with flags set (see above) will be returned upon
// success.
//
// Return of a negative means an error has occurred:
// * NO_INIT - the buffer queue has been abandoned or the producer is not
// connected.
// * BAD_VALUE - both in async mode and buffer count was less than the
// max numbers of buffers that can be allocated at once.
// * INVALID_OPERATION - cannot attach the buffer because it would cause
// too many buffers to be dequeued, either because
// the producer already has a single buffer dequeued
// and did not set a buffer count, or because a
// buffer count was set and this call would cause
// it to be exceeded.
// * WOULD_BLOCK - no buffer is currently available, and blocking is disabled
// since both the producer/consumer are controlled by app
// * NO_MEMORY - out of memory, cannot allocate the graphics buffer.
// * TIMED_OUT - the timeout set by setDequeueTimeout was exceeded while
// waiting for a buffer to become available.
//
// All other negative values are an unknown error returned downstream
// from the graphics allocator (typically errno).
virtual status_t dequeueBuffer(int* slot, sp<Fence>* fence, uint32_t w,
uint32_t h, PixelFormat format, uint32_t usage,
FrameEventHistoryDelta* outTimestamps) = 0;
// detachBuffer attempts to remove all ownership of the buffer in the given
// slot from the buffer queue. If this call succeeds, the slot will be
// freed, and there will be no way to obtain the buffer from this interface.
// The freed slot will remain unallocated until either it is selected to
// hold a freshly allocated buffer in dequeueBuffer or a buffer is attached
// to the slot. The buffer must have already been dequeued, and the caller
// must already possesses the sp<GraphicBuffer> (i.e., must have called
// requestBuffer).
//
// Return of a value other than NO_ERROR means an error has occurred:
// * NO_INIT - the buffer queue has been abandoned or the producer is not
// connected.
// * BAD_VALUE - the given slot number is invalid, either because it is
// out of the range [0, NUM_BUFFER_SLOTS), or because the slot
// it refers to is not currently dequeued and requested.
virtual status_t detachBuffer(int slot) = 0;
// detachNextBuffer is equivalent to calling dequeueBuffer, requestBuffer,
// and detachBuffer in sequence, except for two things:
//
// 1) It is unnecessary to know the dimensions, format, or usage of the
// next buffer.
// 2) It will not block, since if it cannot find an appropriate buffer to
// return, it will return an error instead.
//
// Only slots that are free but still contain a GraphicBuffer will be
// considered, and the oldest of those will be returned. outBuffer is
// equivalent to outBuffer from the requestBuffer call, and outFence is
// equivalent to fence from the dequeueBuffer call.
//
// Return of a value other than NO_ERROR means an error has occurred:
// * NO_INIT - the buffer queue has been abandoned or the producer is not
// connected.
// * BAD_VALUE - either outBuffer or outFence were NULL.
// * NO_MEMORY - no slots were found that were both free and contained a
// GraphicBuffer.
virtual status_t detachNextBuffer(sp<GraphicBuffer>* outBuffer,
sp<Fence>* outFence) = 0;
// attachBuffer attempts to transfer ownership of a buffer to the buffer
// queue. If this call succeeds, it will be as if this buffer was dequeued
// from the returned slot number. As such, this call will fail if attaching
// this buffer would cause too many buffers to be simultaneously dequeued.
//
// If attachBuffer returns the RELEASE_ALL_BUFFERS flag, the caller is
// expected to release all of the mirrored slot->buffer mappings.
//
// A non-negative value with flags set (see above) will be returned upon
// success.
//
// Return of a negative value means an error has occurred:
// * NO_INIT - the buffer queue has been abandoned or the producer is not
// connected.
// * BAD_VALUE - outSlot or buffer were NULL, invalid combination of
// async mode and buffer count override, or the generation
// number of the buffer did not match the buffer queue.
// * INVALID_OPERATION - cannot attach the buffer because it would cause
// too many buffers to be dequeued, either because
// the producer already has a single buffer dequeued
// and did not set a buffer count, or because a
// buffer count was set and this call would cause
// it to be exceeded.
// * WOULD_BLOCK - no buffer slot is currently available, and blocking is
// disabled since both the producer/consumer are
// controlled by the app.
// * TIMED_OUT - the timeout set by setDequeueTimeout was exceeded while
// waiting for a slot to become available.
virtual status_t attachBuffer(int* outSlot,
const sp<GraphicBuffer>& buffer) = 0;
// queueBuffer indicates that the client has finished filling in the
// contents of the buffer associated with slot and transfers ownership of
// that slot back to the server.
//
// It is not valid to call queueBuffer on a slot that is not owned
// by the client or one for which a buffer associated via requestBuffer
// (an attempt to do so will fail with a return value of BAD_VALUE).
//
// In addition, the input must be described by the client (as documented
// below). Any other properties (zero point, etc)
// are client-dependent, and should be documented by the client.
//
// The slot must be in the range of [0, NUM_BUFFER_SLOTS).
//
// Upon success, the output will be filled with meaningful values
// (refer to the documentation below).
//
// Return of a value other than NO_ERROR means an error has occurred:
// * NO_INIT - the buffer queue has been abandoned or the producer is not
// connected.
// * BAD_VALUE - one of the below conditions occurred:
// * fence was NULL
// * scaling mode was unknown
// * both in async mode and buffer count was less than the
// max numbers of buffers that can be allocated at once
// * slot index was out of range (see above).
// * the slot was not in the dequeued state
// * the slot was enqueued without requesting a buffer
// * crop rect is out of bounds of the buffer dimensions
struct QueueBufferInput : public Flattenable<QueueBufferInput> {
friend class Flattenable<QueueBufferInput>;
explicit inline QueueBufferInput(const Parcel& parcel);
// timestamp - a monotonically increasing value in nanoseconds
// isAutoTimestamp - if the timestamp was synthesized at queue time
// dataSpace - description of the contents, interpretation depends on format
// crop - a crop rectangle that's used as a hint to the consumer
// scalingMode - a set of flags from NATIVE_WINDOW_SCALING_* in <window.h>
// transform - a set of flags from NATIVE_WINDOW_TRANSFORM_* in <window.h>
// fence - a fence that the consumer must wait on before reading the buffer,
// set this to Fence::NO_FENCE if the buffer is ready immediately
// sticky - the sticky transform set in Surface (only used by the LEGACY
// camera mode).
// getFrameTimestamps - whether or not the latest frame timestamps
// should be retrieved from the consumer.
inline QueueBufferInput(int64_t _timestamp, bool _isAutoTimestamp,
android_dataspace _dataSpace, const Rect& _crop,
int _scalingMode, uint32_t _transform, const sp<Fence>& _fence,
uint32_t _sticky = 0, bool _getFrameTimestamps = false)
: timestamp(_timestamp), isAutoTimestamp(_isAutoTimestamp),
dataSpace(_dataSpace), crop(_crop), scalingMode(_scalingMode),
transform(_transform), stickyTransform(_sticky), fence(_fence),
surfaceDamage(), getFrameTimestamps(_getFrameTimestamps) { }
inline void deflate(int64_t* outTimestamp, bool* outIsAutoTimestamp,
android_dataspace* outDataSpace,
Rect* outCrop, int* outScalingMode,
uint32_t* outTransform, sp<Fence>* outFence,
uint32_t* outStickyTransform = nullptr,
bool* outGetFrameTimestamps = nullptr) const {
*outTimestamp = timestamp;
*outIsAutoTimestamp = bool(isAutoTimestamp);
*outDataSpace = dataSpace;
*outCrop = crop;
*outScalingMode = scalingMode;
*outTransform = transform;
*outFence = fence;
if (outStickyTransform != NULL) {
*outStickyTransform = stickyTransform;
}
if (outGetFrameTimestamps) {
*outGetFrameTimestamps = getFrameTimestamps;
}
}
// Flattenable protocol
static constexpr size_t minFlattenedSize();
size_t getFlattenedSize() const;
size_t getFdCount() const;
status_t flatten(void*& buffer, size_t& size, int*& fds, size_t& count) const;
status_t unflatten(void const*& buffer, size_t& size, int const*& fds, size_t& count);
const Region& getSurfaceDamage() const { return surfaceDamage; }
void setSurfaceDamage(const Region& damage) { surfaceDamage = damage; }
private:
int64_t timestamp{0};
int isAutoTimestamp{0};
android_dataspace dataSpace{HAL_DATASPACE_UNKNOWN};
Rect crop;
int scalingMode{0};
uint32_t transform{0};
uint32_t stickyTransform{0};
sp<Fence> fence;
Region surfaceDamage;
bool getFrameTimestamps{false};
};
struct QueueBufferOutput : public Flattenable<QueueBufferOutput> {
QueueBufferOutput() = default;
// Moveable.
QueueBufferOutput(QueueBufferOutput&& src) = default;
QueueBufferOutput& operator=(QueueBufferOutput&& src) = default;
// Not copyable.
QueueBufferOutput(const QueueBufferOutput& src) = delete;
QueueBufferOutput& operator=(const QueueBufferOutput& src) = delete;
// Flattenable protocol
static constexpr size_t minFlattenedSize();
size_t getFlattenedSize() const;
size_t getFdCount() const;
status_t flatten(void*& buffer, size_t& size, int*& fds, size_t& count) const;
status_t unflatten(void const*& buffer, size_t& size, int const*& fds, size_t& count);
uint32_t width{0};
uint32_t height{0};
uint32_t transformHint{0};
uint32_t numPendingBuffers{0};
uint64_t nextFrameNumber{0};
FrameEventHistoryDelta frameTimestamps;
bool bufferReplaced{false};
};
virtual status_t queueBuffer(int slot, const QueueBufferInput& input,
QueueBufferOutput* output) = 0;
// cancelBuffer indicates that the client does not wish to fill in the
// buffer associated with slot and transfers ownership of the slot back to
// the server.
//
// The buffer is not queued for use by the consumer.
//
// The slot must be in the range of [0, NUM_BUFFER_SLOTS).
//
// The buffer will not be overwritten until the fence signals. The fence
// will usually be the one obtained from dequeueBuffer.
//
// Return of a value other than NO_ERROR means an error has occurred:
// * NO_INIT - the buffer queue has been abandoned or the producer is not
// connected.
// * BAD_VALUE - one of the below conditions occurred:
// * fence was NULL
// * slot index was out of range (see above).
// * the slot was not in the dequeued state
virtual status_t cancelBuffer(int slot, const sp<Fence>& fence) = 0;
// query retrieves some information for this surface
// 'what' tokens allowed are that of NATIVE_WINDOW_* in <window.h>
//
// Return of a value other than NO_ERROR means an error has occurred:
// * NO_INIT - the buffer queue has been abandoned.
// * BAD_VALUE - what was out of range
virtual int query(int what, int* value) = 0;
// connect attempts to connect a client API to the IGraphicBufferProducer.
// This must be called before any other IGraphicBufferProducer methods are
// called except for getAllocator. A consumer must be already connected.
//
// This method will fail if the connect was previously called on the
// IGraphicBufferProducer and no corresponding disconnect call was made.
//
// The listener is an optional binder callback object that can be used if
// the producer wants to be notified when the consumer releases a buffer
// back to the BufferQueue. It is also used to detect the death of the
// producer. If only the latter functionality is desired, there is a
// DummyProducerListener class in IProducerListener.h that can be used.
//
// The api should be one of the NATIVE_WINDOW_API_* values in <window.h>
//
// The producerControlledByApp should be set to true if the producer is hosted
// by an untrusted process (typically app_process-forked processes). If both
// the producer and the consumer are app-controlled then all buffer queues
// will operate in async mode regardless of the async flag.
//
// Upon success, the output will be filled with meaningful data
// (refer to QueueBufferOutput documentation above).
//
// Return of a value other than NO_ERROR means an error has occurred:
// * NO_INIT - one of the following occurred:
// * the buffer queue was abandoned
// * no consumer has yet connected
// * BAD_VALUE - one of the following has occurred:
// * the producer is already connected
// * api was out of range (see above).
// * output was NULL.
// * Failure to adjust the number of available slots. This can
// happen because of trying to allocate/deallocate the async
// buffer in response to the value of producerControlledByApp.
// * DEAD_OBJECT - the token is hosted by an already-dead process
//
// Additional negative errors may be returned by the internals, they
// should be treated as opaque fatal unrecoverable errors.
virtual status_t connect(const sp<IProducerListener>& listener,
int api, bool producerControlledByApp, QueueBufferOutput* output) = 0;
enum class DisconnectMode {
// Disconnect only the specified API.
Api,
// Disconnect any API originally connected from the process calling disconnect.
AllLocal
};
// disconnect attempts to disconnect a client API from the
// IGraphicBufferProducer. Calling this method will cause any subsequent
// calls to other IGraphicBufferProducer methods to fail except for
// getAllocator and connect. Successfully calling connect after this will
// allow the other methods to succeed again.
//
// The api should be one of the NATIVE_WINDOW_API_* values in <window.h>
//
// Alternatively if mode is AllLocal, then the API value is ignored, and any API
// connected from the same PID calling disconnect will be disconnected.
//
// Disconnecting from an abandoned IGraphicBufferProducer is legal and
// is considered a no-op.
//
// Return of a value other than NO_ERROR means an error has occurred:
// * NO_INIT - the producer is not connected
// * BAD_VALUE - one of the following has occurred:
// * the api specified does not match the one that was connected
// * api was out of range (see above).
// * DEAD_OBJECT - the token is hosted by an already-dead process
virtual status_t disconnect(int api, DisconnectMode mode = DisconnectMode::Api) = 0;
// Attaches a sideband buffer stream to the IGraphicBufferProducer.
//
// A sideband stream is a device-specific mechanism for passing buffers
// from the producer to the consumer without using dequeueBuffer/
// queueBuffer. If a sideband stream is present, the consumer can choose
// whether to acquire buffers from the sideband stream or from the queued
// buffers.
//
// Passing NULL or a different stream handle will detach the previous
// handle if any.
virtual status_t setSidebandStream(const sp<NativeHandle>& stream) = 0;
// Allocates buffers based on the given dimensions/format.
//
// This function will allocate up to the maximum number of buffers
// permitted by the current BufferQueue configuration. It will use the
// given format, dimensions, and usage bits, which are interpreted in the
// same way as for dequeueBuffer, and the async flag must be set the same
// way as for dequeueBuffer to ensure that the correct number of buffers are
// allocated. This is most useful to avoid an allocation delay during
// dequeueBuffer. If there are already the maximum number of buffers
// allocated, this function has no effect.
virtual void allocateBuffers(uint32_t width, uint32_t height,
PixelFormat format, uint32_t usage) = 0;
// Sets whether dequeueBuffer is allowed to allocate new buffers.
//
// Normally dequeueBuffer does not discriminate between free slots which
// already have an allocated buffer and those which do not, and will
// allocate a new buffer if the slot doesn't have a buffer or if the slot's
// buffer doesn't match the requested size, format, or usage. This method
// allows the producer to restrict the eligible slots to those which already
// have an allocated buffer of the correct size, format, and usage. If no
// eligible slot is available, dequeueBuffer will block or return an error
// as usual.
virtual status_t allowAllocation(bool allow) = 0;
// Sets the current generation number of the BufferQueue.
//
// This generation number will be inserted into any buffers allocated by the
// BufferQueue, and any attempts to attach a buffer with a different
// generation number will fail. Buffers already in the queue are not
// affected and will retain their current generation number. The generation
// number defaults to 0.
virtual status_t setGenerationNumber(uint32_t generationNumber) = 0;
// Returns the name of the connected consumer.
virtual String8 getConsumerName() const = 0;
// Used to enable/disable shared buffer mode.
//
// When shared buffer mode is enabled the first buffer that is queued or
// dequeued will be cached and returned to all subsequent calls to
// dequeueBuffer and acquireBuffer. This allows the producer and consumer to
// simultaneously access the same buffer.
virtual status_t setSharedBufferMode(bool sharedBufferMode) = 0;
// Used to enable/disable auto-refresh.
//
// Auto refresh has no effect outside of shared buffer mode. In shared
// buffer mode, when enabled, it indicates to the consumer that it should
// attempt to acquire buffers even if it is not aware of any being
// available.
virtual status_t setAutoRefresh(bool autoRefresh) = 0;
// Sets how long dequeueBuffer will wait for a buffer to become available
// before returning an error (TIMED_OUT).
//
// This timeout also affects the attachBuffer call, which will block if
// there is not a free slot available into which the attached buffer can be
// placed.
//
// By default, the BufferQueue will wait forever, which is indicated by a
// timeout of -1. If set (to a value other than -1), this will disable
// non-blocking mode and its corresponding spare buffer (which is used to
// ensure a buffer is always available).
//
// Return of a value other than NO_ERROR means an error has occurred:
// * BAD_VALUE - Failure to adjust the number of available slots. This can
// happen because of trying to allocate/deallocate the async
// buffer.
virtual status_t setDequeueTimeout(nsecs_t timeout) = 0;
// Returns the last queued buffer along with a fence which must signal
// before the contents of the buffer are read. If there are no buffers in
// the queue, outBuffer will be populated with nullptr and outFence will be
// populated with Fence::NO_FENCE
//
// outTransformMatrix is not modified if outBuffer is null.
//
// Returns NO_ERROR or the status of the Binder transaction
virtual status_t getLastQueuedBuffer(sp<GraphicBuffer>* outBuffer,
sp<Fence>* outFence, float outTransformMatrix[16]) = 0;
// Gets the frame events that haven't already been retrieved.
virtual void getFrameTimestamps(FrameEventHistoryDelta* /*outDelta*/) {}
// Returns a unique id for this BufferQueue
virtual status_t getUniqueId(uint64_t* outId) const = 0;
};
// ----------------------------------------------------------------------------
class BnGraphicBufferProducer : public BnInterface<IGraphicBufferProducer>
{
public:
virtual status_t onTransact( uint32_t code,
const Parcel& data,
Parcel* reply,
uint32_t flags = 0);
};
// ----------------------------------------------------------------------------
}; // namespace android
#endif // ANDROID_GUI_IGRAPHICBUFFERPRODUCER_H