2 * Copyright (C) 2012 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #define LOG_TAG "BufferQueue"
18 #define ATRACE_TAG ATRACE_TAG_GRAPHICS
19 //#define LOG_NDEBUG 0
21 #define GL_GLEXT_PROTOTYPES
22 #define EGL_EGLEXT_PROTOTYPES
25 #include <EGL/eglext.h>
27 #include <gui/BufferQueue.h>
28 #include <gui/ISurfaceComposer.h>
29 #include <private/gui/ComposerService.h>
31 #include <utils/Log.h>
32 #include <utils/Trace.h>
34 // Macros for including the BufferQueue name in log messages
35 #define ST_LOGV(x, ...) ALOGV("[%s] "x, mConsumerName.string(), ##__VA_ARGS__)
36 #define ST_LOGD(x, ...) ALOGD("[%s] "x, mConsumerName.string(), ##__VA_ARGS__)
37 #define ST_LOGI(x, ...) ALOGI("[%s] "x, mConsumerName.string(), ##__VA_ARGS__)
38 #define ST_LOGW(x, ...) ALOGW("[%s] "x, mConsumerName.string(), ##__VA_ARGS__)
39 #define ST_LOGE(x, ...) ALOGE("[%s] "x, mConsumerName.string(), ##__VA_ARGS__)
41 #define ATRACE_BUFFER_INDEX(index) \
42 if (ATRACE_ENABLED()) { \
43 char ___traceBuf[1024]; \
44 snprintf(___traceBuf, 1024, "%s: %d", mConsumerName.string(), \
46 android::ScopedTrace ___bufTracer(ATRACE_TAG, ___traceBuf); \
51 // Get an ID that's unique within this process.
52 static int32_t createProcessUniqueId() {
53 static volatile int32_t globalCounter = 0;
54 return android_atomic_inc(&globalCounter);
57 static const char* scalingModeName(int scalingMode) {
58 switch (scalingMode) {
59 case NATIVE_WINDOW_SCALING_MODE_FREEZE: return "FREEZE";
60 case NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW: return "SCALE_TO_WINDOW";
61 case NATIVE_WINDOW_SCALING_MODE_SCALE_CROP: return "SCALE_CROP";
62 default: return "Unknown";
66 BufferQueue::BufferQueue(bool allowSynchronousMode,
67 const sp<IGraphicBufferAlloc>& allocator) :
70 mMaxAcquiredBufferCount(1),
71 mDefaultMaxBufferCount(2),
72 mOverrideMaxBufferCount(0),
73 mSynchronousMode(false),
74 mAllowSynchronousMode(allowSynchronousMode),
75 mConnectedApi(NO_CONNECTED_API),
78 mBufferHasBeenQueued(false),
79 mDefaultBufferFormat(PIXEL_FORMAT_RGBA_8888),
80 mConsumerUsageBits(0),
83 // Choose a name using the PID and a process-unique ID.
84 mConsumerName = String8::format("unnamed-%d-%d", getpid(), createProcessUniqueId());
86 ST_LOGV("BufferQueue");
87 if (allocator == NULL) {
88 sp<ISurfaceComposer> composer(ComposerService::getComposerService());
89 mGraphicBufferAlloc = composer->createGraphicBufferAlloc();
90 if (mGraphicBufferAlloc == 0) {
91 ST_LOGE("createGraphicBufferAlloc() failed in BufferQueue()");
94 mGraphicBufferAlloc = allocator;
98 BufferQueue::~BufferQueue() {
99 ST_LOGV("~BufferQueue");
102 status_t BufferQueue::setDefaultMaxBufferCountLocked(int count) {
103 if (count < 2 || count > NUM_BUFFER_SLOTS)
106 mDefaultMaxBufferCount = count;
107 mDequeueCondition.broadcast();
112 bool BufferQueue::isSynchronousMode() const {
113 Mutex::Autolock lock(mMutex);
114 return mSynchronousMode;
117 void BufferQueue::setConsumerName(const String8& name) {
118 Mutex::Autolock lock(mMutex);
119 mConsumerName = name;
122 status_t BufferQueue::setDefaultBufferFormat(uint32_t defaultFormat) {
123 Mutex::Autolock lock(mMutex);
124 mDefaultBufferFormat = defaultFormat;
128 status_t BufferQueue::setConsumerUsageBits(uint32_t usage) {
129 Mutex::Autolock lock(mMutex);
130 mConsumerUsageBits = usage;
134 status_t BufferQueue::setTransformHint(uint32_t hint) {
135 ST_LOGV("setTransformHint: %02x", hint);
136 Mutex::Autolock lock(mMutex);
137 mTransformHint = hint;
141 status_t BufferQueue::setBufferCount(int bufferCount) {
142 ST_LOGV("setBufferCount: count=%d", bufferCount);
144 sp<ConsumerListener> listener;
146 Mutex::Autolock lock(mMutex);
149 ST_LOGE("setBufferCount: BufferQueue has been abandoned!");
152 if (bufferCount > NUM_BUFFER_SLOTS) {
153 ST_LOGE("setBufferCount: bufferCount too large (max %d)",
158 // Error out if the user has dequeued buffers
159 int maxBufferCount = getMaxBufferCountLocked();
160 for (int i=0 ; i<maxBufferCount; i++) {
161 if (mSlots[i].mBufferState == BufferSlot::DEQUEUED) {
162 ST_LOGE("setBufferCount: client owns some buffers");
167 const int minBufferSlots = getMinMaxBufferCountLocked();
168 if (bufferCount == 0) {
169 mOverrideMaxBufferCount = 0;
170 mDequeueCondition.broadcast();
174 if (bufferCount < minBufferSlots) {
175 ST_LOGE("setBufferCount: requested buffer count (%d) is less than "
176 "minimum (%d)", bufferCount, minBufferSlots);
180 // here we're guaranteed that the client doesn't have dequeued buffers
181 // and will release all of its buffer references.
183 // XXX: Should this use drainQueueAndFreeBuffersLocked instead?
184 freeAllBuffersLocked();
185 mOverrideMaxBufferCount = bufferCount;
186 mBufferHasBeenQueued = false;
187 mDequeueCondition.broadcast();
188 listener = mConsumerListener;
191 if (listener != NULL) {
192 listener->onBuffersReleased();
198 int BufferQueue::query(int what, int* outValue)
201 Mutex::Autolock lock(mMutex);
204 ST_LOGE("query: BufferQueue has been abandoned!");
210 case NATIVE_WINDOW_WIDTH:
211 value = mDefaultWidth;
213 case NATIVE_WINDOW_HEIGHT:
214 value = mDefaultHeight;
216 case NATIVE_WINDOW_FORMAT:
217 value = mDefaultBufferFormat;
219 case NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS:
220 value = getMinUndequeuedBufferCountLocked();
222 case NATIVE_WINDOW_CONSUMER_RUNNING_BEHIND:
223 value = (mQueue.size() >= 2);
232 status_t BufferQueue::requestBuffer(int slot, sp<GraphicBuffer>* buf) {
234 ST_LOGV("requestBuffer: slot=%d", slot);
235 Mutex::Autolock lock(mMutex);
237 ST_LOGE("requestBuffer: BufferQueue has been abandoned!");
240 int maxBufferCount = getMaxBufferCountLocked();
241 if (slot < 0 || maxBufferCount <= slot) {
242 ST_LOGE("requestBuffer: slot index out of range [0, %d]: %d",
243 maxBufferCount, slot);
245 } else if (mSlots[slot].mBufferState != BufferSlot::DEQUEUED) {
246 // XXX: I vaguely recall there was some reason this can be valid, but
247 // for the life of me I can't recall under what circumstances that's
249 ST_LOGE("requestBuffer: slot %d is not owned by the client (state=%d)",
250 slot, mSlots[slot].mBufferState);
253 mSlots[slot].mRequestBufferCalled = true;
254 *buf = mSlots[slot].mGraphicBuffer;
258 status_t BufferQueue::dequeueBuffer(int *outBuf, sp<Fence>* outFence,
259 uint32_t w, uint32_t h, uint32_t format, uint32_t usage) {
261 ST_LOGV("dequeueBuffer: w=%d h=%d fmt=%#x usage=%#x", w, h, format, usage);
263 if ((w && !h) || (!w && h)) {
264 ST_LOGE("dequeueBuffer: invalid size: w=%u, h=%u", w, h);
268 status_t returnFlags(OK);
269 EGLDisplay dpy = EGL_NO_DISPLAY;
270 EGLSyncKHR eglFence = EGL_NO_SYNC_KHR;
272 { // Scope for the lock
273 Mutex::Autolock lock(mMutex);
276 format = mDefaultBufferFormat;
278 // turn on usage bits the consumer requested
279 usage |= mConsumerUsageBits;
282 int dequeuedCount = 0;
283 bool tryAgain = true;
286 ST_LOGE("dequeueBuffer: BufferQueue has been abandoned!");
290 const int maxBufferCount = getMaxBufferCountLocked();
292 // Free up any buffers that are in slots beyond the max buffer
294 for (int i = maxBufferCount; i < NUM_BUFFER_SLOTS; i++) {
295 assert(mSlots[i].mBufferState == BufferSlot::FREE);
296 if (mSlots[i].mGraphicBuffer != NULL) {
298 returnFlags |= IGraphicBufferProducer::RELEASE_ALL_BUFFERS;
302 // look for a free buffer to give to the client
303 found = INVALID_BUFFER_SLOT;
305 for (int i = 0; i < maxBufferCount; i++) {
306 const int state = mSlots[i].mBufferState;
307 if (state == BufferSlot::DEQUEUED) {
311 if (state == BufferSlot::FREE) {
312 /* We return the oldest of the free buffers to avoid
313 * stalling the producer if possible. This is because
314 * the consumer may still have pending reads of the
318 mSlots[i].mFrameNumber < mSlots[found].mFrameNumber) {
324 // clients are not allowed to dequeue more than one buffer
325 // if they didn't set a buffer count.
326 if (!mOverrideMaxBufferCount && dequeuedCount) {
327 ST_LOGE("dequeueBuffer: can't dequeue multiple buffers without "
328 "setting the buffer count");
332 // See whether a buffer has been queued since the last
333 // setBufferCount so we know whether to perform the min undequeued
334 // buffers check below.
335 if (mBufferHasBeenQueued) {
336 // make sure the client is not trying to dequeue more buffers
338 const int newUndequeuedCount = maxBufferCount - (dequeuedCount+1);
339 const int minUndequeuedCount = getMinUndequeuedBufferCountLocked();
340 if (newUndequeuedCount < minUndequeuedCount) {
341 ST_LOGE("dequeueBuffer: min undequeued buffer count (%d) "
342 "exceeded (dequeued=%d undequeudCount=%d)",
343 minUndequeuedCount, dequeuedCount,
349 // If no buffer is found, wait for a buffer to be released or for
350 // the max buffer count to change.
351 tryAgain = found == INVALID_BUFFER_SLOT;
353 mDequeueCondition.wait(mMutex);
358 if (found == INVALID_BUFFER_SLOT) {
359 // This should not happen.
360 ST_LOGE("dequeueBuffer: no available buffer slots");
364 const int buf = found;
367 ATRACE_BUFFER_INDEX(buf);
369 const bool useDefaultSize = !w && !h;
370 if (useDefaultSize) {
371 // use the default size
376 mSlots[buf].mBufferState = BufferSlot::DEQUEUED;
378 const sp<GraphicBuffer>& buffer(mSlots[buf].mGraphicBuffer);
379 if ((buffer == NULL) ||
380 (uint32_t(buffer->width) != w) ||
381 (uint32_t(buffer->height) != h) ||
382 (uint32_t(buffer->format) != format) ||
383 ((uint32_t(buffer->usage) & usage) != usage))
385 mSlots[buf].mAcquireCalled = false;
386 mSlots[buf].mGraphicBuffer = NULL;
387 mSlots[buf].mRequestBufferCalled = false;
388 mSlots[buf].mEglFence = EGL_NO_SYNC_KHR;
389 mSlots[buf].mFence = Fence::NO_FENCE;
390 mSlots[buf].mEglDisplay = EGL_NO_DISPLAY;
392 returnFlags |= IGraphicBufferProducer::BUFFER_NEEDS_REALLOCATION;
395 dpy = mSlots[buf].mEglDisplay;
396 eglFence = mSlots[buf].mEglFence;
397 *outFence = mSlots[buf].mFence;
398 mSlots[buf].mEglFence = EGL_NO_SYNC_KHR;
399 mSlots[buf].mFence = Fence::NO_FENCE;
402 if (returnFlags & IGraphicBufferProducer::BUFFER_NEEDS_REALLOCATION) {
404 sp<GraphicBuffer> graphicBuffer(
405 mGraphicBufferAlloc->createGraphicBuffer(
406 w, h, format, usage, &error));
407 if (graphicBuffer == 0) {
408 ST_LOGE("dequeueBuffer: SurfaceComposer::createGraphicBuffer "
413 { // Scope for the lock
414 Mutex::Autolock lock(mMutex);
417 ST_LOGE("dequeueBuffer: BufferQueue has been abandoned!");
421 mSlots[*outBuf].mGraphicBuffer = graphicBuffer;
425 if (eglFence != EGL_NO_SYNC_KHR) {
426 EGLint result = eglClientWaitSyncKHR(dpy, eglFence, 0, 1000000000);
427 // If something goes wrong, log the error, but return the buffer without
428 // synchronizing access to it. It's too late at this point to abort the
429 // dequeue operation.
430 if (result == EGL_FALSE) {
431 ST_LOGE("dequeueBuffer: error waiting for fence: %#x", eglGetError());
432 } else if (result == EGL_TIMEOUT_EXPIRED_KHR) {
433 ST_LOGE("dequeueBuffer: timeout waiting for fence");
435 eglDestroySyncKHR(dpy, eglFence);
438 ST_LOGV("dequeueBuffer: returning slot=%d buf=%p flags=%#x", *outBuf,
439 mSlots[*outBuf].mGraphicBuffer->handle, returnFlags);
444 status_t BufferQueue::setSynchronousMode(bool enabled) {
446 ST_LOGV("setSynchronousMode: enabled=%d", enabled);
447 Mutex::Autolock lock(mMutex);
450 ST_LOGE("setSynchronousMode: BufferQueue has been abandoned!");
455 if (!mAllowSynchronousMode && enabled)
459 // going to asynchronous mode, drain the queue
460 err = drainQueueLocked();
465 if (mSynchronousMode != enabled) {
466 // - if we're going to asynchronous mode, the queue is guaranteed to be
468 // - if the client set the number of buffers, we're guaranteed that
469 // we have at least 3 (because we don't allow less)
470 mSynchronousMode = enabled;
471 mDequeueCondition.broadcast();
476 status_t BufferQueue::queueBuffer(int buf,
477 const QueueBufferInput& input, QueueBufferOutput* output) {
479 ATRACE_BUFFER_INDEX(buf);
487 input.deflate(×tamp, &crop, &scalingMode, &transform, &fence);
490 ST_LOGE("queueBuffer: fence is NULL");
494 ST_LOGV("queueBuffer: slot=%d time=%#llx crop=[%d,%d,%d,%d] tr=%#x "
496 buf, timestamp, crop.left, crop.top, crop.right, crop.bottom,
497 transform, scalingModeName(scalingMode));
499 sp<ConsumerListener> listener;
501 { // scope for the lock
502 Mutex::Autolock lock(mMutex);
504 ST_LOGE("queueBuffer: BufferQueue has been abandoned!");
507 int maxBufferCount = getMaxBufferCountLocked();
508 if (buf < 0 || buf >= maxBufferCount) {
509 ST_LOGE("queueBuffer: slot index out of range [0, %d]: %d",
510 maxBufferCount, buf);
512 } else if (mSlots[buf].mBufferState != BufferSlot::DEQUEUED) {
513 ST_LOGE("queueBuffer: slot %d is not owned by the client "
514 "(state=%d)", buf, mSlots[buf].mBufferState);
516 } else if (!mSlots[buf].mRequestBufferCalled) {
517 ST_LOGE("queueBuffer: slot %d was enqueued without requesting a "
522 const sp<GraphicBuffer>& graphicBuffer(mSlots[buf].mGraphicBuffer);
523 Rect bufferRect(graphicBuffer->getWidth(), graphicBuffer->getHeight());
525 crop.intersect(bufferRect, &croppedCrop);
526 if (croppedCrop != crop) {
527 ST_LOGE("queueBuffer: crop rect is not contained within the "
528 "buffer in slot %d", buf);
532 if (mSynchronousMode) {
533 // In synchronous mode we queue all buffers in a FIFO.
534 mQueue.push_back(buf);
536 // Synchronous mode always signals that an additional frame should
538 listener = mConsumerListener;
540 // In asynchronous mode we only keep the most recent buffer.
541 if (mQueue.empty()) {
542 mQueue.push_back(buf);
544 // Asynchronous mode only signals that a frame should be
545 // consumed if no previous frame was pending. If a frame were
546 // pending then the consumer would have already been notified.
547 listener = mConsumerListener;
549 Fifo::iterator front(mQueue.begin());
550 // buffer currently queued is freed
551 mSlots[*front].mBufferState = BufferSlot::FREE;
552 // and we record the new buffer index in the queued list
557 mSlots[buf].mTimestamp = timestamp;
558 mSlots[buf].mCrop = crop;
559 mSlots[buf].mTransform = transform;
560 mSlots[buf].mFence = fence;
562 switch (scalingMode) {
563 case NATIVE_WINDOW_SCALING_MODE_FREEZE:
564 case NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW:
565 case NATIVE_WINDOW_SCALING_MODE_SCALE_CROP:
568 ST_LOGE("unknown scaling mode: %d (ignoring)", scalingMode);
569 scalingMode = mSlots[buf].mScalingMode;
573 mSlots[buf].mBufferState = BufferSlot::QUEUED;
574 mSlots[buf].mScalingMode = scalingMode;
576 mSlots[buf].mFrameNumber = mFrameCounter;
578 mBufferHasBeenQueued = true;
579 mDequeueCondition.broadcast();
581 output->inflate(mDefaultWidth, mDefaultHeight, mTransformHint,
584 ATRACE_INT(mConsumerName.string(), mQueue.size());
585 } // scope for the lock
587 // call back without lock held
589 listener->onFrameAvailable();
594 void BufferQueue::cancelBuffer(int buf, const sp<Fence>& fence) {
596 ST_LOGV("cancelBuffer: slot=%d", buf);
597 Mutex::Autolock lock(mMutex);
600 ST_LOGW("cancelBuffer: BufferQueue has been abandoned!");
604 int maxBufferCount = getMaxBufferCountLocked();
605 if (buf < 0 || buf >= maxBufferCount) {
606 ST_LOGE("cancelBuffer: slot index out of range [0, %d]: %d",
607 maxBufferCount, buf);
609 } else if (mSlots[buf].mBufferState != BufferSlot::DEQUEUED) {
610 ST_LOGE("cancelBuffer: slot %d is not owned by the client (state=%d)",
611 buf, mSlots[buf].mBufferState);
613 } else if (fence == NULL) {
614 ST_LOGE("cancelBuffer: fence is NULL");
617 mSlots[buf].mBufferState = BufferSlot::FREE;
618 mSlots[buf].mFrameNumber = 0;
619 mSlots[buf].mFence = fence;
620 mDequeueCondition.broadcast();
623 status_t BufferQueue::connect(int api, QueueBufferOutput* output) {
625 ST_LOGV("connect: api=%d", api);
626 Mutex::Autolock lock(mMutex);
629 ST_LOGE("connect: BufferQueue has been abandoned!");
633 if (mConsumerListener == NULL) {
634 ST_LOGE("connect: BufferQueue has no consumer!");
640 case NATIVE_WINDOW_API_EGL:
641 case NATIVE_WINDOW_API_CPU:
642 case NATIVE_WINDOW_API_MEDIA:
643 case NATIVE_WINDOW_API_CAMERA:
644 if (mConnectedApi != NO_CONNECTED_API) {
645 ST_LOGE("connect: already connected (cur=%d, req=%d)",
650 output->inflate(mDefaultWidth, mDefaultHeight, mTransformHint,
659 mBufferHasBeenQueued = false;
664 status_t BufferQueue::disconnect(int api) {
666 ST_LOGV("disconnect: api=%d", api);
669 sp<ConsumerListener> listener;
671 { // Scope for the lock
672 Mutex::Autolock lock(mMutex);
675 // it is not really an error to disconnect after the surface
676 // has been abandoned, it should just be a no-op.
681 case NATIVE_WINDOW_API_EGL:
682 case NATIVE_WINDOW_API_CPU:
683 case NATIVE_WINDOW_API_MEDIA:
684 case NATIVE_WINDOW_API_CAMERA:
685 if (mConnectedApi == api) {
686 drainQueueAndFreeBuffersLocked();
687 mConnectedApi = NO_CONNECTED_API;
688 mDequeueCondition.broadcast();
689 listener = mConsumerListener;
691 ST_LOGE("disconnect: connected to another api (cur=%d, req=%d)",
697 ST_LOGE("disconnect: unknown API %d", api);
703 if (listener != NULL) {
704 listener->onBuffersReleased();
710 void BufferQueue::dump(String8& result) const {
711 BufferQueue::dump(result, "");
714 void BufferQueue::dump(String8& result, const char* prefix) const {
715 Mutex::Autolock _l(mMutex);
719 Fifo::const_iterator i(mQueue.begin());
720 while (i != mQueue.end()) {
721 fifo.appendFormat("%02d ", *i++);
725 int maxBufferCount = getMaxBufferCountLocked();
728 "%s-BufferQueue maxBufferCount=%d, mSynchronousMode=%d, default-size=[%dx%d], "
729 "default-format=%d, transform-hint=%02x, FIFO(%d)={%s}\n",
730 prefix, maxBufferCount, mSynchronousMode, mDefaultWidth,
731 mDefaultHeight, mDefaultBufferFormat, mTransformHint,
732 fifoSize, fifo.string());
735 const char * operator()(int state) const {
737 case BufferSlot::DEQUEUED: return "DEQUEUED";
738 case BufferSlot::QUEUED: return "QUEUED";
739 case BufferSlot::FREE: return "FREE";
740 case BufferSlot::ACQUIRED: return "ACQUIRED";
741 default: return "Unknown";
746 for (int i=0 ; i<maxBufferCount ; i++) {
747 const BufferSlot& slot(mSlots[i]);
750 "state=%-8s, crop=[%d,%d,%d,%d], "
751 "xform=0x%02x, time=%#llx, scale=%s",
752 prefix, (slot.mBufferState == BufferSlot::ACQUIRED)?">":" ", i,
753 stateName(slot.mBufferState),
754 slot.mCrop.left, slot.mCrop.top, slot.mCrop.right,
755 slot.mCrop.bottom, slot.mTransform, slot.mTimestamp,
756 scalingModeName(slot.mScalingMode)
759 const sp<GraphicBuffer>& buf(slot.mGraphicBuffer);
762 ", %p [%4ux%4u:%4u,%3X]",
763 buf->handle, buf->width, buf->height, buf->stride,
770 void BufferQueue::freeBufferLocked(int slot) {
771 ST_LOGV("freeBufferLocked: slot=%d", slot);
772 mSlots[slot].mGraphicBuffer = 0;
773 if (mSlots[slot].mBufferState == BufferSlot::ACQUIRED) {
774 mSlots[slot].mNeedsCleanupOnRelease = true;
776 mSlots[slot].mBufferState = BufferSlot::FREE;
777 mSlots[slot].mFrameNumber = 0;
778 mSlots[slot].mAcquireCalled = false;
780 // destroy fence as BufferQueue now takes ownership
781 if (mSlots[slot].mEglFence != EGL_NO_SYNC_KHR) {
782 eglDestroySyncKHR(mSlots[slot].mEglDisplay, mSlots[slot].mEglFence);
783 mSlots[slot].mEglFence = EGL_NO_SYNC_KHR;
785 mSlots[slot].mFence = Fence::NO_FENCE;
788 void BufferQueue::freeAllBuffersLocked() {
789 ALOGW_IF(!mQueue.isEmpty(),
790 "freeAllBuffersLocked called but mQueue is not empty");
792 mBufferHasBeenQueued = false;
793 for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
798 status_t BufferQueue::acquireBuffer(BufferItem *buffer) {
800 Mutex::Autolock _l(mMutex);
802 // Check that the consumer doesn't currently have the maximum number of
803 // buffers acquired. We allow the max buffer count to be exceeded by one
804 // buffer, so that the consumer can successfully set up the newly acquired
805 // buffer before releasing the old one.
806 int numAcquiredBuffers = 0;
807 for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
808 if (mSlots[i].mBufferState == BufferSlot::ACQUIRED) {
809 numAcquiredBuffers++;
812 if (numAcquiredBuffers >= mMaxAcquiredBufferCount+1) {
813 ST_LOGE("acquireBuffer: max acquired buffer count reached: %d (max=%d)",
814 numAcquiredBuffers, mMaxAcquiredBufferCount);
815 return INVALID_OPERATION;
818 // check if queue is empty
819 // In asynchronous mode the list is guaranteed to be one buffer
820 // deep, while in synchronous mode we use the oldest buffer.
821 if (!mQueue.empty()) {
822 Fifo::iterator front(mQueue.begin());
825 ATRACE_BUFFER_INDEX(buf);
827 if (mSlots[buf].mAcquireCalled) {
828 buffer->mGraphicBuffer = NULL;
830 buffer->mGraphicBuffer = mSlots[buf].mGraphicBuffer;
832 buffer->mCrop = mSlots[buf].mCrop;
833 buffer->mTransform = mSlots[buf].mTransform;
834 buffer->mScalingMode = mSlots[buf].mScalingMode;
835 buffer->mFrameNumber = mSlots[buf].mFrameNumber;
836 buffer->mTimestamp = mSlots[buf].mTimestamp;
838 buffer->mFence = mSlots[buf].mFence;
840 mSlots[buf].mAcquireCalled = true;
841 mSlots[buf].mNeedsCleanupOnRelease = false;
842 mSlots[buf].mBufferState = BufferSlot::ACQUIRED;
843 mSlots[buf].mFence = Fence::NO_FENCE;
846 mDequeueCondition.broadcast();
848 ATRACE_INT(mConsumerName.string(), mQueue.size());
850 return NO_BUFFER_AVAILABLE;
856 status_t BufferQueue::releaseBuffer(int buf, EGLDisplay display,
857 EGLSyncKHR eglFence, const sp<Fence>& fence) {
859 ATRACE_BUFFER_INDEX(buf);
861 Mutex::Autolock _l(mMutex);
863 if (buf == INVALID_BUFFER_SLOT || fence == NULL) {
867 mSlots[buf].mEglDisplay = display;
868 mSlots[buf].mEglFence = eglFence;
869 mSlots[buf].mFence = fence;
871 // The buffer can now only be released if its in the acquired state
872 if (mSlots[buf].mBufferState == BufferSlot::ACQUIRED) {
873 mSlots[buf].mBufferState = BufferSlot::FREE;
874 } else if (mSlots[buf].mNeedsCleanupOnRelease) {
875 ST_LOGV("releasing a stale buf %d its state was %d", buf, mSlots[buf].mBufferState);
876 mSlots[buf].mNeedsCleanupOnRelease = false;
877 return STALE_BUFFER_SLOT;
879 ST_LOGE("attempted to release buf %d but its state was %d", buf, mSlots[buf].mBufferState);
883 mDequeueCondition.broadcast();
887 status_t BufferQueue::consumerConnect(const sp<ConsumerListener>& consumerListener) {
888 ST_LOGV("consumerConnect");
889 Mutex::Autolock lock(mMutex);
892 ST_LOGE("consumerConnect: BufferQueue has been abandoned!");
895 if (consumerListener == NULL) {
896 ST_LOGE("consumerConnect: consumerListener may not be NULL");
900 mConsumerListener = consumerListener;
905 status_t BufferQueue::consumerDisconnect() {
906 ST_LOGV("consumerDisconnect");
907 Mutex::Autolock lock(mMutex);
909 if (mConsumerListener == NULL) {
910 ST_LOGE("consumerDisconnect: No consumer is connected!");
915 mConsumerListener = NULL;
917 freeAllBuffersLocked();
918 mDequeueCondition.broadcast();
922 status_t BufferQueue::getReleasedBuffers(uint32_t* slotMask) {
923 ST_LOGV("getReleasedBuffers");
924 Mutex::Autolock lock(mMutex);
927 ST_LOGE("getReleasedBuffers: BufferQueue has been abandoned!");
932 for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
933 if (!mSlots[i].mAcquireCalled) {
939 ST_LOGV("getReleasedBuffers: returning mask %#x", mask);
943 status_t BufferQueue::setDefaultBufferSize(uint32_t w, uint32_t h)
945 ST_LOGV("setDefaultBufferSize: w=%d, h=%d", w, h);
947 ST_LOGE("setDefaultBufferSize: dimensions cannot be 0 (w=%d, h=%d)",
952 Mutex::Autolock lock(mMutex);
958 status_t BufferQueue::setDefaultMaxBufferCount(int bufferCount) {
960 Mutex::Autolock lock(mMutex);
961 return setDefaultMaxBufferCountLocked(bufferCount);
964 status_t BufferQueue::setMaxAcquiredBufferCount(int maxAcquiredBuffers) {
966 Mutex::Autolock lock(mMutex);
967 if (maxAcquiredBuffers < 1 || maxAcquiredBuffers > MAX_MAX_ACQUIRED_BUFFERS) {
968 ST_LOGE("setMaxAcquiredBufferCount: invalid count specified: %d",
972 if (mConnectedApi != NO_CONNECTED_API) {
973 return INVALID_OPERATION;
975 mMaxAcquiredBufferCount = maxAcquiredBuffers;
979 void BufferQueue::freeAllBuffersExceptHeadLocked() {
981 if (!mQueue.empty()) {
982 Fifo::iterator front(mQueue.begin());
985 mBufferHasBeenQueued = false;
986 for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
993 status_t BufferQueue::drainQueueLocked() {
994 while (mSynchronousMode && mQueue.size() > 1) {
995 mDequeueCondition.wait(mMutex);
997 ST_LOGE("drainQueueLocked: BufferQueue has been abandoned!");
1000 if (mConnectedApi == NO_CONNECTED_API) {
1001 ST_LOGE("drainQueueLocked: BufferQueue is not connected!");
1008 status_t BufferQueue::drainQueueAndFreeBuffersLocked() {
1009 status_t err = drainQueueLocked();
1010 if (err == NO_ERROR) {
1011 if (mQueue.empty()) {
1012 freeAllBuffersLocked();
1014 freeAllBuffersExceptHeadLocked();
1020 int BufferQueue::getMinMaxBufferCountLocked() const {
1021 return getMinUndequeuedBufferCountLocked() + 1;
1024 int BufferQueue::getMinUndequeuedBufferCountLocked() const {
1025 return mSynchronousMode ? mMaxAcquiredBufferCount :
1026 mMaxAcquiredBufferCount + 1;
1029 int BufferQueue::getMaxBufferCountLocked() const {
1030 int minMaxBufferCount = getMinMaxBufferCountLocked();
1032 int maxBufferCount = mDefaultMaxBufferCount;
1033 if (maxBufferCount < minMaxBufferCount) {
1034 maxBufferCount = minMaxBufferCount;
1036 if (mOverrideMaxBufferCount != 0) {
1037 assert(mOverrideMaxBufferCount >= minMaxBufferCount);
1038 maxBufferCount = mOverrideMaxBufferCount;
1041 // Any buffers that are dequeued by the producer or sitting in the queue
1042 // waiting to be consumed need to have their slots preserved. Such
1043 // buffers will temporarily keep the max buffer count up until the slots
1044 // no longer need to be preserved.
1045 for (int i = maxBufferCount; i < NUM_BUFFER_SLOTS; i++) {
1046 BufferSlot::BufferState state = mSlots[i].mBufferState;
1047 if (state == BufferSlot::QUEUED || state == BufferSlot::DEQUEUED) {
1048 maxBufferCount = i + 1;
1052 return maxBufferCount;
1055 BufferQueue::ProxyConsumerListener::ProxyConsumerListener(
1056 const wp<BufferQueue::ConsumerListener>& consumerListener):
1057 mConsumerListener(consumerListener) {}
1059 BufferQueue::ProxyConsumerListener::~ProxyConsumerListener() {}
1061 void BufferQueue::ProxyConsumerListener::onFrameAvailable() {
1062 sp<BufferQueue::ConsumerListener> listener(mConsumerListener.promote());
1063 if (listener != NULL) {
1064 listener->onFrameAvailable();
1068 void BufferQueue::ProxyConsumerListener::onBuffersReleased() {
1069 sp<BufferQueue::ConsumerListener> listener(mConsumerListener.promote());
1070 if (listener != NULL) {
1071 listener->onBuffersReleased();
1075 }; // namespace android