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/*
* 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_SURFACETEXTURE_H
#define ANDROID_GUI_SURFACETEXTURE_H
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <GLES2/gl2.h>
#include <gui/ISurfaceTexture.h>
#include <ui/GraphicBuffer.h>
#include <utils/threads.h>
#include <utils/Vector.h>
#define ANDROID_GRAPHICS_SURFACETEXTURE_JNI_ID "mSurfaceTexture"
namespace android {
// ----------------------------------------------------------------------------
class IGraphicBufferAlloc;
class String8;
class SurfaceTexture : public BnSurfaceTexture {
public:
enum { MIN_UNDEQUEUED_BUFFERS = 2 };
enum {
MIN_ASYNC_BUFFER_SLOTS = MIN_UNDEQUEUED_BUFFERS + 1,
MIN_SYNC_BUFFER_SLOTS = MIN_UNDEQUEUED_BUFFERS
};
enum { NUM_BUFFER_SLOTS = 32 };
struct FrameAvailableListener : public virtual RefBase {
// onFrameAvailable() is called from queueBuffer() is the FIFO is
// empty. You can use SurfaceTexture::getQueuedCount() to
// figure out if there are more frames waiting.
// This is called without any lock held can be called concurrently by
// multiple threads.
virtual void onFrameAvailable() = 0;
};
// tex indicates the name OpenGL texture to which images are to be streamed.
// This texture name cannot be changed once the SurfaceTexture is created.
SurfaceTexture(GLuint tex, bool allowSynchronousMode = true);
virtual ~SurfaceTexture();
// setBufferCount updates the number of available buffer slots. After
// calling this all buffer slots are both unallocated and owned by the
// SurfaceTexture object (i.e. they are not owned by the client).
virtual status_t setBufferCount(int bufferCount);
virtual sp<GraphicBuffer> requestBuffer(int buf);
// dequeueBuffer gets the next buffer slot index for the client to use. If a
// buffer slot is available then that slot index is written to the location
// pointed to by the buf argument and a status of OK is returned. If no
// slot is available then a status of -EBUSY is returned and buf is
// unmodified.
virtual status_t dequeueBuffer(int *buf, uint32_t w, uint32_t h,
uint32_t format, uint32_t usage);
// queueBuffer returns a filled buffer to the SurfaceTexture. In addition, a
// timestamp must be provided for the buffer. The timestamp is in
// nanoseconds, and must be monotonically increasing. Its other semantics
// (zero point, etc) are client-dependent and should be documented by the
// client.
virtual status_t queueBuffer(int buf, int64_t timestamp);
virtual void cancelBuffer(int buf);
virtual status_t setCrop(const Rect& reg);
virtual status_t setTransform(uint32_t transform);
virtual int query(int what, int* value);
// setSynchronousMode set whether dequeueBuffer is synchronous or
// asynchronous. In synchronous mode, dequeueBuffer blocks until
// a buffer is available, the currently bound buffer can be dequeued and
// queued buffers will be retired in order.
// The default mode is asynchronous.
virtual status_t setSynchronousMode(bool enabled);
// updateTexImage sets the image contents of the target texture to that of
// the most recently queued buffer.
//
// This call may only be made while the OpenGL ES context to which the
// target texture belongs is bound to the calling thread.
status_t updateTexImage();
// getqueuedCount returns the number of queued frames waiting in the
// FIFO. In asynchronous mode, this always returns 0 or 1 since
// frames are not accumulating in the FIFO.
size_t getQueuedCount() const;
// setBufferCountServer set the buffer count. If the client has requested
// a buffer count using setBufferCount, the server-buffer count will
// take effect once the client sets the count back to zero.
status_t setBufferCountServer(int bufferCount);
// getTransformMatrix retrieves the 4x4 texture coordinate transform matrix
// associated with the texture image set by the most recent call to
// updateTexImage.
//
// This transform matrix maps 2D homogeneous texture coordinates of the form
// (s, t, 0, 1) with s and t in the inclusive range [0, 1] to the texture
// coordinate that should be used to sample that location from the texture.
// Sampling the texture outside of the range of this transform is undefined.
//
// This transform is necessary to compensate for transforms that the stream
// content producer may implicitly apply to the content. By forcing users of
// a SurfaceTexture to apply this transform we avoid performing an extra
// copy of the data that would be needed to hide the transform from the
// user.
//
// The matrix is stored in column-major order so that it may be passed
// directly to OpenGL ES via the glLoadMatrixf or glUniformMatrix4fv
// functions.
void getTransformMatrix(float mtx[16]);
// getTimestamp retrieves the timestamp associated with the texture image
// set by the most recent call to updateTexImage.
//
// The timestamp is in nanoseconds, and is monotonically increasing. Its
// other semantics (zero point, etc) are source-dependent and should be
// documented by the source.
int64_t getTimestamp();
// setFrameAvailableListener sets the listener object that will be notified
// when a new frame becomes available.
void setFrameAvailableListener(const sp<FrameAvailableListener>& l);
// getAllocator retrieves the binder object that must be referenced as long
// as the GraphicBuffers dequeued from this SurfaceTexture are referenced.
// Holding this binder reference prevents SurfaceFlinger from freeing the
// buffers before the client is done with them.
sp<IBinder> getAllocator();
// setDefaultBufferSize is used to set the size of buffers returned by
// requestBuffers when a with and height of zero is requested.
// A call to setDefaultBufferSize() may trigger requestBuffers() to
// be called from the client.
status_t setDefaultBufferSize(uint32_t w, uint32_t h);
// getCurrentBuffer returns the buffer associated with the current image.
sp<GraphicBuffer> getCurrentBuffer() const;
// getCurrentTextureTarget returns the texture target of the current
// texture as returned by updateTexImage().
GLenum getCurrentTextureTarget() const;
// getCurrentCrop returns the cropping rectangle of the current buffer
Rect getCurrentCrop() const;
// getCurrentTransform returns the transform of the current buffer
uint32_t getCurrentTransform() const;
// dump our state in a String
void dump(String8& result) const;
void dump(String8& result, const char* prefix, char* buffer, size_t SIZE) const;
protected:
// freeAllBuffers frees the resources (both GraphicBuffer and EGLImage) for
// all slots.
void freeAllBuffers();
static bool isExternalFormat(uint32_t format);
static GLenum getTextureTarget(uint32_t format);
private:
// createImage creates a new EGLImage from a GraphicBuffer.
EGLImageKHR createImage(EGLDisplay dpy,
const sp<GraphicBuffer>& graphicBuffer);
status_t setBufferCountServerLocked(int bufferCount);
// computeCurrentTransformMatrix computes the transform matrix for the
// current texture. It uses mCurrentTransform and the current GraphicBuffer
// to compute this matrix and stores it in mCurrentTransformMatrix.
void computeCurrentTransformMatrix();
enum { INVALID_BUFFER_SLOT = -1 };
struct BufferSlot {
BufferSlot()
: mEglImage(EGL_NO_IMAGE_KHR),
mEglDisplay(EGL_NO_DISPLAY),
mBufferState(BufferSlot::FREE),
mRequestBufferCalled(false),
mTransform(0),
mTimestamp(0) {
mCrop.makeInvalid();
}
// mGraphicBuffer points to the buffer allocated for this slot or is NULL
// if no buffer has been allocated.
sp<GraphicBuffer> mGraphicBuffer;
// mEglImage is the EGLImage created from mGraphicBuffer.
EGLImageKHR mEglImage;
// mEglDisplay is the EGLDisplay used to create mEglImage.
EGLDisplay mEglDisplay;
// BufferState represents the different states in which a buffer slot
// can be.
enum BufferState {
// FREE indicates that the buffer is not currently being used and
// will not be used in the future until it gets dequeued and
// subseqently queued by the client.
FREE = 0,
// DEQUEUED indicates that the buffer has been dequeued by the
// client, but has not yet been queued or canceled. The buffer is
// considered 'owned' by the client, and the server should not use
// it for anything.
//
// Note that when in synchronous-mode (mSynchronousMode == true),
// the buffer that's currently attached to the texture may be
// dequeued by the client. That means that the current buffer can
// be in either the DEQUEUED or QUEUED state. In asynchronous mode,
// however, the current buffer is always in the QUEUED state.
DEQUEUED = 1,
// QUEUED indicates that the buffer has been queued by the client,
// and has not since been made available for the client to dequeue.
// Attaching the buffer to the texture does NOT transition the
// buffer away from the QUEUED state. However, in Synchronous mode
// the current buffer may be dequeued by the client under some
// circumstances. See the note about the current buffer in the
// documentation for DEQUEUED.
QUEUED = 2,
};
// mBufferState is the current state of this buffer slot.
BufferState mBufferState;
// mRequestBufferCalled is used for validating that the client did
// call requestBuffer() when told to do so. Technically this is not
// needed but useful for debugging and catching client bugs.
bool mRequestBufferCalled;
// mCrop is the current crop rectangle for this buffer slot. This gets
// set to mNextCrop each time queueBuffer gets called for this buffer.
Rect mCrop;
// mTransform is the current transform flags for this buffer slot. This
// gets set to mNextTransform each time queueBuffer gets called for this
// slot.
uint32_t mTransform;
// mTimestamp is the current timestamp for this buffer slot. This gets
// to set by queueBuffer each time this slot is queued.
int64_t mTimestamp;
};
// mSlots is the array of buffer slots that must be mirrored on the client
// side. This allows buffer ownership to be transferred between the client
// and server without sending a GraphicBuffer over binder. The entire array
// is initialized to NULL at construction time, and buffers are allocated
// for a slot when requestBuffer is called with that slot's index.
BufferSlot mSlots[NUM_BUFFER_SLOTS];
// mDefaultWidth holds the default width of allocated buffers. It is used
// in requestBuffers() if a width and height of zero is specified.
uint32_t mDefaultWidth;
// mDefaultHeight holds the default height of allocated buffers. It is used
// in requestBuffers() if a width and height of zero is specified.
uint32_t mDefaultHeight;
// mPixelFormat holds the pixel format of allocated buffers. It is used
// in requestBuffers() if a format of zero is specified.
uint32_t mPixelFormat;
// mBufferCount is the number of buffer slots that the client and server
// must maintain. It defaults to MIN_ASYNC_BUFFER_SLOTS and can be changed
// by calling setBufferCount or setBufferCountServer
int mBufferCount;
// mClientBufferCount is the number of buffer slots requested by the client.
// The default is zero, which means the client doesn't care how many buffers
// there is.
int mClientBufferCount;
// mServerBufferCount buffer count requested by the server-side
int mServerBufferCount;
// mCurrentTexture is the buffer slot index of the buffer that is currently
// bound to the OpenGL texture. It is initialized to INVALID_BUFFER_SLOT,
// indicating that no buffer slot is currently bound to the texture. Note,
// however, that a value of INVALID_BUFFER_SLOT does not necessarily mean
// that no buffer is bound to the texture. A call to setBufferCount will
// reset mCurrentTexture to INVALID_BUFFER_SLOT.
int mCurrentTexture;
// mCurrentTextureTarget is the GLES texture target to be used with the
// current texture.
GLenum mCurrentTextureTarget;
// mCurrentTextureBuf is the graphic buffer of the current texture. It's
// possible that this buffer is not associated with any buffer slot, so we
// must track it separately in order to properly use
// IGraphicBufferAlloc::freeAllGraphicBuffersExcept.
sp<GraphicBuffer> mCurrentTextureBuf;
// mCurrentCrop is the crop rectangle that applies to the current texture.
// It gets set to mLastQueuedCrop each time updateTexImage is called.
Rect mCurrentCrop;
// mCurrentTransform is the transform identifier for the current texture. It
// gets set to mLastQueuedTransform each time updateTexImage is called.
uint32_t mCurrentTransform;
// mCurrentTransformMatrix is the transform matrix for the current texture.
// It gets computed by computeTransformMatrix each time updateTexImage is
// called.
float mCurrentTransformMatrix[16];
// mCurrentTimestamp is the timestamp for the current texture. It
// gets set to mLastQueuedTimestamp each time updateTexImage is called.
int64_t mCurrentTimestamp;
// mNextCrop is the crop rectangle that will be used for the next buffer
// that gets queued. It is set by calling setCrop.
Rect mNextCrop;
// mNextTransform is the transform identifier that will be used for the next
// buffer that gets queued. It is set by calling setTransform.
uint32_t mNextTransform;
// mTexName is the name of the OpenGL texture to which streamed images will
// be bound when updateTexImage is called. It is set at construction time
// changed with a call to setTexName.
const GLuint mTexName;
// mGraphicBufferAlloc is the connection to SurfaceFlinger that is used to
// allocate new GraphicBuffer objects.
sp<IGraphicBufferAlloc> mGraphicBufferAlloc;
// mFrameAvailableListener is the listener object that will be called when a
// new frame becomes available. If it is not NULL it will be called from
// queueBuffer.
sp<FrameAvailableListener> mFrameAvailableListener;
// mSynchronousMode whether we're in synchronous mode or not
bool mSynchronousMode;
// mAllowSynchronousMode whether we allow synchronous mode or not
const bool mAllowSynchronousMode;
// mDequeueCondition condition used for dequeueBuffer in synchronous mode
mutable Condition mDequeueCondition;
// mQueue is a FIFO of queued buffers used in synchronous mode
typedef Vector<int> Fifo;
Fifo mQueue;
// mMutex is the mutex used to prevent concurrent access to the member
// variables of SurfaceTexture objects. It must be locked whenever the
// member variables are accessed.
mutable Mutex mMutex;
};
// ----------------------------------------------------------------------------
}; // namespace android
#endif // ANDROID_GUI_SURFACETEXTURE_H
|