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* Copyright 2014 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <gui/BufferQueueDefs.h>
#include <gui/IGraphicBufferConsumer.h>
#include <utils/String8.h>
namespace android {
class BufferQueueCore;
class BufferQueueConsumer : public BnGraphicBufferConsumer {
explicit BufferQueueConsumer(const sp<BufferQueueCore>& core);
~BufferQueueConsumer() override;
// acquireBuffer attempts to acquire ownership of the next pending buffer in
// the BufferQueue. If no buffer is pending then it returns
// NO_BUFFER_AVAILABLE. If a buffer is successfully acquired, the
// information about the buffer is returned in BufferItem. If the buffer
// returned had previously been acquired then the BufferItem::mGraphicBuffer
// field of buffer is set to NULL and it is assumed that the consumer still
// holds a reference to the buffer.
// If expectedPresent is nonzero, it indicates the time when the buffer
// will be displayed on screen. If the buffer's timestamp is farther in the
// future, the buffer won't be acquired, and PRESENT_LATER will be
// returned. The presentation time is in nanoseconds, and the time base
virtual status_t acquireBuffer(BufferItem* outBuffer,
nsecs_t expectedPresent, uint64_t maxFrameNumber = 0) override;
// See IGraphicBufferConsumer::detachBuffer
virtual status_t detachBuffer(int slot);
// See IGraphicBufferConsumer::attachBuffer
virtual status_t attachBuffer(int* slot, const sp<GraphicBuffer>& buffer);
// releaseBuffer releases a buffer slot from the consumer back to the
// BufferQueue. This may be done while the buffer's contents are still
// being accessed. The fence will signal when the buffer is no longer
// in use. frameNumber is used to indentify the exact buffer returned.
// If releaseBuffer returns STALE_BUFFER_SLOT, then the consumer must free
// any references to the just-released buffer that it might have, as if it
// had received a onBuffersReleased() call with a mask set for the released
// buffer.
// Note that the dependencies on EGL will be removed once we switch to using
// the Android HW Sync HAL.
virtual status_t releaseBuffer(int slot, uint64_t frameNumber,
const sp<Fence>& releaseFence, EGLDisplay display,
EGLSyncKHR fence);
// connect connects a consumer to the BufferQueue. Only one
// consumer may be connected, and when that consumer disconnects the
// BufferQueue is placed into the "abandoned" state, causing most
// interactions with the BufferQueue by the producer to fail.
// controlledByApp indicates whether the consumer is controlled by
// the application.
// consumerListener may not be NULL.
virtual status_t connect(const sp<IConsumerListener>& consumerListener,
bool controlledByApp);
// disconnect disconnects a consumer from the BufferQueue. All
// buffers will be freed and the BufferQueue is placed in the "abandoned"
// state, causing most interactions with the BufferQueue by the producer to
// fail.
virtual status_t disconnect();
// getReleasedBuffers sets the value pointed to by outSlotMask to a bit mask
// indicating which buffer slots have been released by the BufferQueue
// but have not yet been released by the consumer.
// This should be called from the onBuffersReleased() callback.
virtual status_t getReleasedBuffers(uint64_t* outSlotMask);
// setDefaultBufferSize is used to set the size of buffers returned by
// dequeueBuffer when a width and height of zero is requested. Default
// is 1x1.
virtual status_t setDefaultBufferSize(uint32_t width, uint32_t height);
// see IGraphicBufferConsumer::setMaxBufferCount
virtual status_t setMaxBufferCount(int bufferCount);
// setMaxAcquiredBufferCount sets the maximum number of buffers that can
// be acquired by the consumer at one time (default 1). This call will
// fail if a producer is connected to the BufferQueue.
virtual status_t setMaxAcquiredBufferCount(int maxAcquiredBuffers);
// setConsumerName sets the name used in logging
status_t setConsumerName(const String8& name) override;
// setDefaultBufferFormat allows the BufferQueue to create
// GraphicBuffers of a defaultFormat if no format is specified
// in dequeueBuffer. The initial default is HAL_PIXEL_FORMAT_RGBA_8888.
virtual status_t setDefaultBufferFormat(PixelFormat defaultFormat);
// setDefaultBufferDataSpace allows the BufferQueue to create
// GraphicBuffers of a defaultDataSpace if no data space is specified
// in queueBuffer.
// The initial default is HAL_DATASPACE_UNKNOWN
virtual status_t setDefaultBufferDataSpace(android_dataspace defaultDataSpace);
// setConsumerUsageBits will turn on additional usage bits for dequeueBuffer.
// These are merged with the bits passed to dequeueBuffer. The values are
// enumerated in gralloc.h, e.g. GRALLOC_USAGE_HW_RENDER; the default is 0.
virtual status_t setConsumerUsageBits(uint64_t usage) override;
// setConsumerIsProtected will turn on an internal bit that indicates whether
// the consumer can handle protected gralloc buffers (i.e. with
// GRALLOC_USAGE_PROTECTED set). IGraphicBufferProducer can query this
virtual status_t setConsumerIsProtected(bool isProtected);
// setTransformHint bakes in rotation to buffers so overlays can be used.
// The values are enumerated in window.h, e.g.
// NATIVE_WINDOW_TRANSFORM_ROT_90. The default is 0 (no transform).
virtual status_t setTransformHint(uint32_t hint);
// Retrieve the sideband buffer stream, if any.
status_t getSidebandStream(sp<NativeHandle>* outStream) const override;
// See IGraphicBufferConsumer::getOccupancyHistory
virtual status_t getOccupancyHistory(bool forceFlush,
std::vector<OccupancyTracker::Segment>* outHistory) override;
// See IGraphicBufferConsumer::discardFreeBuffers
virtual status_t discardFreeBuffers() override;
// dump our state in a String
status_t dumpState(const String8& prefix, String8* outResult) const override;
// Functions required for backwards compatibility.
// These will be modified/renamed in IGraphicBufferConsumer and will be
// removed from this class at that time. See b/13306289.
virtual status_t releaseBuffer(int buf, uint64_t frameNumber,
EGLDisplay display, EGLSyncKHR fence,
const sp<Fence>& releaseFence) {
return releaseBuffer(buf, frameNumber, releaseFence, display, fence);
virtual status_t consumerConnect(const sp<IConsumerListener>& consumer,
bool controlledByApp) {
return connect(consumer, controlledByApp);
virtual status_t consumerDisconnect() { return disconnect(); }
// End functions required for backwards compatibility
// Value used to determine if present time is valid.
constexpr static int MAX_REASONABLE_NSEC = 1'000'000'000ULL; // 1 second
sp<BufferQueueCore> mCore;
// This references mCore->mSlots. Lock mCore->mMutex while accessing.
BufferQueueDefs::SlotsType& mSlots;
// This is a cached copy of the name stored in the BufferQueueCore.
// It's updated during setConsumerName.
String8 mConsumerName;
}; // class BufferQueueConsumer
} // namespace android