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* Copyright (C) 2012 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 <gui/ConsumerBase.h>
#include <ui/GraphicBuffer.h>
#include <utils/String8.h>
#include <utils/Vector.h>
#include <utils/threads.h>
namespace android {
class BufferQueue;
* CpuConsumer is a BufferQueue consumer endpoint that allows direct CPU
* access to the underlying gralloc buffers provided by BufferQueue. Multiple
* buffers may be acquired by it at once, to be used concurrently by the
* CpuConsumer owner. Sets gralloc usage flags to be software-read-only.
* This queue is synchronous by default.
class CpuConsumer : public ConsumerBase
typedef ConsumerBase::FrameAvailableListener FrameAvailableListener;
struct LockedBuffer {
uint8_t *data;
uint32_t width;
uint32_t height;
PixelFormat format;
uint32_t stride;
Rect crop;
uint32_t transform;
uint32_t scalingMode;
int64_t timestamp;
uint64_t frameNumber;
// Values below are only valid when using
// HAL_PIXEL_FORMAT_YCbCr_420_888, in which case LockedBuffer::data
// contains the Y channel, and stride is the Y channel stride. For other
// formats, these will all be 0.
uint8_t *dataCb;
uint8_t *dataCr;
uint32_t chromaStride;
uint32_t chromaStep;
// Create a new CPU consumer. The maxLockedBuffers parameter specifies
// how many buffers can be locked for user access at the same time.
CpuConsumer(const sp<IGraphicBufferConsumer>& bq,
uint32_t maxLockedBuffers, bool controlledByApp = false);
virtual ~CpuConsumer();
// set the name of the CpuConsumer that will be used to identify it in
// log messages.
void setName(const String8& name);
// setDefaultBufferSize is used to set the size of buffers returned by
// requestBuffers when a width and height of zero is requested.
// A call to setDefaultBufferSize() may trigger requestBuffers() to
// be called from the client. Default size is 1x1.
status_t setDefaultBufferSize(uint32_t width, uint32_t height);
// setDefaultBufferFormat allows CpuConsumer's BufferQueue to create buffers
// of a defaultFormat if no format is specified by producer. Formats are
// enumerated in graphics.h; the initial default is
status_t setDefaultBufferFormat(uint32_t defaultFormat);
// Gets the next graphics buffer from the producer and locks it for CPU use,
// filling out the passed-in locked buffer structure with the native pointer
// and metadata. Returns BAD_VALUE if no new buffer is available, and
// NOT_ENOUGH_DATA if the maximum number of buffers is already locked.
// Only a fixed number of buffers can be locked at a time, determined by the
// construction-time maxLockedBuffers parameter. If INVALID_OPERATION is
// returned by lockNextBuffer, then old buffers must be returned to the queue
// by calling unlockBuffer before more buffers can be acquired.
status_t lockNextBuffer(LockedBuffer *nativeBuffer);
// Returns a locked buffer to the queue, allowing it to be reused. Since
// only a fixed number of buffers may be locked at a time, old buffers must
// be released by calling unlockBuffer to ensure new buffers can be acquired by
// lockNextBuffer.
status_t unlockBuffer(const LockedBuffer &nativeBuffer);
// Maximum number of buffers that can be locked at a time
uint32_t mMaxLockedBuffers;
status_t releaseAcquiredBufferLocked(int lockedIdx);
virtual void freeBufferLocked(int slotIndex);
// Tracking for buffers acquired by the user
struct AcquiredBuffer {
// Need to track the original mSlot index and the buffer itself because
// the mSlot entry may be freed/reused before the acquired buffer is
// released.
int mSlot;
sp<GraphicBuffer> mGraphicBuffer;
void *mBufferPointer;
AcquiredBuffer() :
mBufferPointer(NULL) {
Vector<AcquiredBuffer> mAcquiredBuffers;
// Count of currently locked buffers
uint32_t mCurrentLockedBuffers;
} // namespace android