SurfaceTexture.h revision 97c602c5af5f3ffd69009bf496d86347b71a2b4c
1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef ANDROID_GUI_SURFACETEXTURE_H 18#define ANDROID_GUI_SURFACETEXTURE_H 19 20#include <EGL/egl.h> 21#include <EGL/eglext.h> 22#include <GLES2/gl2.h> 23 24#include <gui/ISurfaceTexture.h> 25 26#include <ui/GraphicBuffer.h> 27 28#include <utils/threads.h> 29#include <utils/Vector.h> 30 31#define ANDROID_GRAPHICS_SURFACETEXTURE_JNI_ID "mSurfaceTexture" 32 33namespace android { 34// ---------------------------------------------------------------------------- 35 36class IGraphicBufferAlloc; 37class String8; 38 39class SurfaceTexture : public BnSurfaceTexture { 40public: 41 enum { MIN_UNDEQUEUED_BUFFERS = 2 }; 42 enum { 43 MIN_ASYNC_BUFFER_SLOTS = MIN_UNDEQUEUED_BUFFERS + 1, 44 MIN_SYNC_BUFFER_SLOTS = MIN_UNDEQUEUED_BUFFERS 45 }; 46 enum { NUM_BUFFER_SLOTS = 32 }; 47 enum { NO_CONNECTED_API = 0 }; 48 49 struct FrameAvailableListener : public virtual RefBase { 50 // onFrameAvailable() is called from queueBuffer() each time an 51 // additional frame becomes available for consumption. This means that 52 // frames that are queued while in asynchronous mode only trigger the 53 // callback if no previous frames are pending. Frames queued while in 54 // synchronous mode always trigger the callback. 55 // 56 // This is called without any lock held and can be called concurrently 57 // by multiple threads. 58 virtual void onFrameAvailable() = 0; 59 }; 60 61 // tex indicates the name OpenGL texture to which images are to be streamed. 62 // This texture name cannot be changed once the SurfaceTexture is created. 63 SurfaceTexture(GLuint tex, bool allowSynchronousMode = true); 64 65 virtual ~SurfaceTexture(); 66 67 // setBufferCount updates the number of available buffer slots. After 68 // calling this all buffer slots are both unallocated and owned by the 69 // SurfaceTexture object (i.e. they are not owned by the client). 70 virtual status_t setBufferCount(int bufferCount); 71 72 virtual sp<GraphicBuffer> requestBuffer(int buf); 73 74 // dequeueBuffer gets the next buffer slot index for the client to use. If a 75 // buffer slot is available then that slot index is written to the location 76 // pointed to by the buf argument and a status of OK is returned. If no 77 // slot is available then a status of -EBUSY is returned and buf is 78 // unmodified. 79 virtual status_t dequeueBuffer(int *buf, uint32_t w, uint32_t h, 80 uint32_t format, uint32_t usage); 81 82 // queueBuffer returns a filled buffer to the SurfaceTexture. In addition, a 83 // timestamp must be provided for the buffer. The timestamp is in 84 // nanoseconds, and must be monotonically increasing. Its other semantics 85 // (zero point, etc) are client-dependent and should be documented by the 86 // client. 87 virtual status_t queueBuffer(int buf, int64_t timestamp, 88 uint32_t* outWidth, uint32_t* outHeight, uint32_t* outTransform); 89 virtual void cancelBuffer(int buf); 90 virtual status_t setCrop(const Rect& reg); 91 virtual status_t setTransform(uint32_t transform); 92 virtual status_t setScalingMode(int mode); 93 94 virtual int query(int what, int* value); 95 96 // setSynchronousMode set whether dequeueBuffer is synchronous or 97 // asynchronous. In synchronous mode, dequeueBuffer blocks until 98 // a buffer is available, the currently bound buffer can be dequeued and 99 // queued buffers will be retired in order. 100 // The default mode is asynchronous. 101 virtual status_t setSynchronousMode(bool enabled); 102 103 // connect attempts to connect a client API to the SurfaceTexture. This 104 // must be called before any other ISurfaceTexture methods are called except 105 // for getAllocator. 106 // 107 // This method will fail if the connect was previously called on the 108 // SurfaceTexture and no corresponding disconnect call was made. 109 virtual status_t connect(int api); 110 111 // disconnect attempts to disconnect a client API from the SurfaceTexture. 112 // Calling this method will cause any subsequent calls to other 113 // ISurfaceTexture methods to fail except for getAllocator and connect. 114 // Successfully calling connect after this will allow the other methods to 115 // succeed again. 116 // 117 // This method will fail if the the SurfaceTexture is not currently 118 // connected to the specified client API. 119 virtual status_t disconnect(int api); 120 121 // updateTexImage sets the image contents of the target texture to that of 122 // the most recently queued buffer. 123 // 124 // This call may only be made while the OpenGL ES context to which the 125 // target texture belongs is bound to the calling thread. 126 status_t updateTexImage(); 127 128 // setBufferCountServer set the buffer count. If the client has requested 129 // a buffer count using setBufferCount, the server-buffer count will 130 // take effect once the client sets the count back to zero. 131 status_t setBufferCountServer(int bufferCount); 132 133 // getTransformMatrix retrieves the 4x4 texture coordinate transform matrix 134 // associated with the texture image set by the most recent call to 135 // updateTexImage. 136 // 137 // This transform matrix maps 2D homogeneous texture coordinates of the form 138 // (s, t, 0, 1) with s and t in the inclusive range [0, 1] to the texture 139 // coordinate that should be used to sample that location from the texture. 140 // Sampling the texture outside of the range of this transform is undefined. 141 // 142 // This transform is necessary to compensate for transforms that the stream 143 // content producer may implicitly apply to the content. By forcing users of 144 // a SurfaceTexture to apply this transform we avoid performing an extra 145 // copy of the data that would be needed to hide the transform from the 146 // user. 147 // 148 // The matrix is stored in column-major order so that it may be passed 149 // directly to OpenGL ES via the glLoadMatrixf or glUniformMatrix4fv 150 // functions. 151 void getTransformMatrix(float mtx[16]); 152 153 // getTimestamp retrieves the timestamp associated with the texture image 154 // set by the most recent call to updateTexImage. 155 // 156 // The timestamp is in nanoseconds, and is monotonically increasing. Its 157 // other semantics (zero point, etc) are source-dependent and should be 158 // documented by the source. 159 int64_t getTimestamp(); 160 161 // setFrameAvailableListener sets the listener object that will be notified 162 // when a new frame becomes available. 163 void setFrameAvailableListener(const sp<FrameAvailableListener>& listener); 164 165 // getAllocator retrieves the binder object that must be referenced as long 166 // as the GraphicBuffers dequeued from this SurfaceTexture are referenced. 167 // Holding this binder reference prevents SurfaceFlinger from freeing the 168 // buffers before the client is done with them. 169 sp<IBinder> getAllocator(); 170 171 // setDefaultBufferSize is used to set the size of buffers returned by 172 // requestBuffers when a with and height of zero is requested. 173 // A call to setDefaultBufferSize() may trigger requestBuffers() to 174 // be called from the client. 175 status_t setDefaultBufferSize(uint32_t w, uint32_t h); 176 177 // getCurrentBuffer returns the buffer associated with the current image. 178 sp<GraphicBuffer> getCurrentBuffer() const; 179 180 // getCurrentTextureTarget returns the texture target of the current 181 // texture as returned by updateTexImage(). 182 GLenum getCurrentTextureTarget() const; 183 184 // getCurrentCrop returns the cropping rectangle of the current buffer 185 Rect getCurrentCrop() const; 186 187 // getCurrentTransform returns the transform of the current buffer 188 uint32_t getCurrentTransform() const; 189 190 // getCurrentScalingMode returns the scaling mode of the current buffer 191 uint32_t getCurrentScalingMode() const; 192 193 // dump our state in a String 194 void dump(String8& result) const; 195 void dump(String8& result, const char* prefix, char* buffer, size_t SIZE) const; 196 197protected: 198 199 // freeAllBuffers frees the resources (both GraphicBuffer and EGLImage) for 200 // all slots. 201 void freeAllBuffers(); 202 static bool isExternalFormat(uint32_t format); 203 static GLenum getTextureTarget(uint32_t format); 204 205private: 206 207 // createImage creates a new EGLImage from a GraphicBuffer. 208 EGLImageKHR createImage(EGLDisplay dpy, 209 const sp<GraphicBuffer>& graphicBuffer); 210 211 status_t setBufferCountServerLocked(int bufferCount); 212 213 // computeCurrentTransformMatrix computes the transform matrix for the 214 // current texture. It uses mCurrentTransform and the current GraphicBuffer 215 // to compute this matrix and stores it in mCurrentTransformMatrix. 216 void computeCurrentTransformMatrix(); 217 218 enum { INVALID_BUFFER_SLOT = -1 }; 219 220 struct BufferSlot { 221 222 BufferSlot() 223 : mEglImage(EGL_NO_IMAGE_KHR), 224 mEglDisplay(EGL_NO_DISPLAY), 225 mBufferState(BufferSlot::FREE), 226 mRequestBufferCalled(false), 227 mTransform(0), 228 mScalingMode(NATIVE_WINDOW_SCALING_MODE_FREEZE), 229 mTimestamp(0) { 230 mCrop.makeInvalid(); 231 } 232 233 // mGraphicBuffer points to the buffer allocated for this slot or is NULL 234 // if no buffer has been allocated. 235 sp<GraphicBuffer> mGraphicBuffer; 236 237 // mEglImage is the EGLImage created from mGraphicBuffer. 238 EGLImageKHR mEglImage; 239 240 // mEglDisplay is the EGLDisplay used to create mEglImage. 241 EGLDisplay mEglDisplay; 242 243 // BufferState represents the different states in which a buffer slot 244 // can be. 245 enum BufferState { 246 // FREE indicates that the buffer is not currently being used and 247 // will not be used in the future until it gets dequeued and 248 // subseqently queued by the client. 249 FREE = 0, 250 251 // DEQUEUED indicates that the buffer has been dequeued by the 252 // client, but has not yet been queued or canceled. The buffer is 253 // considered 'owned' by the client, and the server should not use 254 // it for anything. 255 // 256 // Note that when in synchronous-mode (mSynchronousMode == true), 257 // the buffer that's currently attached to the texture may be 258 // dequeued by the client. That means that the current buffer can 259 // be in either the DEQUEUED or QUEUED state. In asynchronous mode, 260 // however, the current buffer is always in the QUEUED state. 261 DEQUEUED = 1, 262 263 // QUEUED indicates that the buffer has been queued by the client, 264 // and has not since been made available for the client to dequeue. 265 // Attaching the buffer to the texture does NOT transition the 266 // buffer away from the QUEUED state. However, in Synchronous mode 267 // the current buffer may be dequeued by the client under some 268 // circumstances. See the note about the current buffer in the 269 // documentation for DEQUEUED. 270 QUEUED = 2, 271 }; 272 273 // mBufferState is the current state of this buffer slot. 274 BufferState mBufferState; 275 276 // mRequestBufferCalled is used for validating that the client did 277 // call requestBuffer() when told to do so. Technically this is not 278 // needed but useful for debugging and catching client bugs. 279 bool mRequestBufferCalled; 280 281 // mCrop is the current crop rectangle for this buffer slot. This gets 282 // set to mNextCrop each time queueBuffer gets called for this buffer. 283 Rect mCrop; 284 285 // mTransform is the current transform flags for this buffer slot. This 286 // gets set to mNextTransform each time queueBuffer gets called for this 287 // slot. 288 uint32_t mTransform; 289 290 // mScalingMode is the current scaling mode for this buffer slot. This 291 // gets set to mNextScalingMode each time queueBuffer gets called for 292 // this slot. 293 uint32_t mScalingMode; 294 295 // mTimestamp is the current timestamp for this buffer slot. This gets 296 // to set by queueBuffer each time this slot is queued. 297 int64_t mTimestamp; 298 }; 299 300 // mSlots is the array of buffer slots that must be mirrored on the client 301 // side. This allows buffer ownership to be transferred between the client 302 // and server without sending a GraphicBuffer over binder. The entire array 303 // is initialized to NULL at construction time, and buffers are allocated 304 // for a slot when requestBuffer is called with that slot's index. 305 BufferSlot mSlots[NUM_BUFFER_SLOTS]; 306 307 // mDefaultWidth holds the default width of allocated buffers. It is used 308 // in requestBuffers() if a width and height of zero is specified. 309 uint32_t mDefaultWidth; 310 311 // mDefaultHeight holds the default height of allocated buffers. It is used 312 // in requestBuffers() if a width and height of zero is specified. 313 uint32_t mDefaultHeight; 314 315 // mPixelFormat holds the pixel format of allocated buffers. It is used 316 // in requestBuffers() if a format of zero is specified. 317 uint32_t mPixelFormat; 318 319 // mBufferCount is the number of buffer slots that the client and server 320 // must maintain. It defaults to MIN_ASYNC_BUFFER_SLOTS and can be changed 321 // by calling setBufferCount or setBufferCountServer 322 int mBufferCount; 323 324 // mClientBufferCount is the number of buffer slots requested by the client. 325 // The default is zero, which means the client doesn't care how many buffers 326 // there is. 327 int mClientBufferCount; 328 329 // mServerBufferCount buffer count requested by the server-side 330 int mServerBufferCount; 331 332 // mCurrentTexture is the buffer slot index of the buffer that is currently 333 // bound to the OpenGL texture. It is initialized to INVALID_BUFFER_SLOT, 334 // indicating that no buffer slot is currently bound to the texture. Note, 335 // however, that a value of INVALID_BUFFER_SLOT does not necessarily mean 336 // that no buffer is bound to the texture. A call to setBufferCount will 337 // reset mCurrentTexture to INVALID_BUFFER_SLOT. 338 int mCurrentTexture; 339 340 // mCurrentTextureTarget is the GLES texture target to be used with the 341 // current texture. 342 GLenum mCurrentTextureTarget; 343 344 // mCurrentTextureBuf is the graphic buffer of the current texture. It's 345 // possible that this buffer is not associated with any buffer slot, so we 346 // must track it separately in order to properly use 347 // IGraphicBufferAlloc::freeAllGraphicBuffersExcept. 348 sp<GraphicBuffer> mCurrentTextureBuf; 349 350 // mCurrentCrop is the crop rectangle that applies to the current texture. 351 // It gets set each time updateTexImage is called. 352 Rect mCurrentCrop; 353 354 // mCurrentTransform is the transform identifier for the current texture. It 355 // gets set each time updateTexImage is called. 356 uint32_t mCurrentTransform; 357 358 // mCurrentScalingMode is the scaling mode for the current texture. It gets 359 // set to each time updateTexImage is called. 360 uint32_t mCurrentScalingMode; 361 362 // mCurrentTransformMatrix is the transform matrix for the current texture. 363 // It gets computed by computeTransformMatrix each time updateTexImage is 364 // called. 365 float mCurrentTransformMatrix[16]; 366 367 // mCurrentTimestamp is the timestamp for the current texture. It 368 // gets set each time updateTexImage is called. 369 int64_t mCurrentTimestamp; 370 371 // mNextCrop is the crop rectangle that will be used for the next buffer 372 // that gets queued. It is set by calling setCrop. 373 Rect mNextCrop; 374 375 // mNextTransform is the transform identifier that will be used for the next 376 // buffer that gets queued. It is set by calling setTransform. 377 uint32_t mNextTransform; 378 379 // mNextScalingMode is the scaling mode that will be used for the next 380 // buffers that get queued. It is set by calling setScalingMode. 381 int mNextScalingMode; 382 383 // mTexName is the name of the OpenGL texture to which streamed images will 384 // be bound when updateTexImage is called. It is set at construction time 385 // changed with a call to setTexName. 386 const GLuint mTexName; 387 388 // mGraphicBufferAlloc is the connection to SurfaceFlinger that is used to 389 // allocate new GraphicBuffer objects. 390 sp<IGraphicBufferAlloc> mGraphicBufferAlloc; 391 392 // mFrameAvailableListener is the listener object that will be called when a 393 // new frame becomes available. If it is not NULL it will be called from 394 // queueBuffer. 395 sp<FrameAvailableListener> mFrameAvailableListener; 396 397 // mSynchronousMode whether we're in synchronous mode or not 398 bool mSynchronousMode; 399 400 // mAllowSynchronousMode whether we allow synchronous mode or not 401 const bool mAllowSynchronousMode; 402 403 // mConnectedApi indicates the API that is currently connected to this 404 // SurfaceTexture. It defaults to NO_CONNECTED_API (= 0), and gets updated 405 // by the connect and disconnect methods. 406 int mConnectedApi; 407 408 // mDequeueCondition condition used for dequeueBuffer in synchronous mode 409 mutable Condition mDequeueCondition; 410 411 // mQueue is a FIFO of queued buffers used in synchronous mode 412 typedef Vector<int> Fifo; 413 Fifo mQueue; 414 415 // mMutex is the mutex used to prevent concurrent access to the member 416 // variables of SurfaceTexture objects. It must be locked whenever the 417 // member variables are accessed. 418 mutable Mutex mMutex; 419 420}; 421 422// ---------------------------------------------------------------------------- 423}; // namespace android 424 425#endif // ANDROID_GUI_SURFACETEXTURE_H 426