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Diffstat (limited to 'libs/gui/BufferQueue.cpp')
| -rw-r--r-- | libs/gui/BufferQueue.cpp | 722 |
1 files changed, 722 insertions, 0 deletions
diff --git a/libs/gui/BufferQueue.cpp b/libs/gui/BufferQueue.cpp new file mode 100644 index 0000000..c7e2c0f --- /dev/null +++ b/libs/gui/BufferQueue.cpp @@ -0,0 +1,722 @@ +/* + * 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 + * + * 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. + */ + +#define LOG_TAG "BufferQueue" + +#define GL_GLEXT_PROTOTYPES +#define EGL_EGLEXT_PROTOTYPES + +#include <EGL/egl.h> +#include <EGL/eglext.h> + +#include <gui/BufferQueue.h> +#include <private/gui/ComposerService.h> +#include <surfaceflinger/ISurfaceComposer.h> + +#include <utils/Log.h> + +// This compile option causes SurfaceTexture to return the buffer that is currently +// attached to the GL texture from dequeueBuffer when no other buffers are +// available. It requires the drivers (Gralloc, GL, OMX IL, and Camera) to do +// implicit cross-process synchronization to prevent the buffer from being +// written to before the buffer has (a) been detached from the GL texture and +// (b) all GL reads from the buffer have completed. +#ifdef ALLOW_DEQUEUE_CURRENT_BUFFER +#define FLAG_ALLOW_DEQUEUE_CURRENT_BUFFER true +#warning "ALLOW_DEQUEUE_CURRENT_BUFFER enabled" +#else +#define FLAG_ALLOW_DEQUEUE_CURRENT_BUFFER false +#endif + +// Macros for including the BufferQueue name in log messages +#define ST_LOGV(x, ...) ALOGV("[%s] "x, mName.string(), ##__VA_ARGS__) +#define ST_LOGD(x, ...) ALOGD("[%s] "x, mName.string(), ##__VA_ARGS__) +#define ST_LOGI(x, ...) ALOGI("[%s] "x, mName.string(), ##__VA_ARGS__) +#define ST_LOGW(x, ...) ALOGW("[%s] "x, mName.string(), ##__VA_ARGS__) +#define ST_LOGE(x, ...) ALOGE("[%s] "x, mName.string(), ##__VA_ARGS__) + +namespace android { + +// Get an ID that's unique within this process. +static int32_t createProcessUniqueId() { + static volatile int32_t globalCounter = 0; + return android_atomic_inc(&globalCounter); +} + +BufferQueue::BufferQueue( bool allowSynchronousMode ) : + mDefaultWidth(1), + mDefaultHeight(1), + mPixelFormat(PIXEL_FORMAT_RGBA_8888), + mBufferCount(MIN_ASYNC_BUFFER_SLOTS), + mClientBufferCount(0), + mServerBufferCount(MIN_ASYNC_BUFFER_SLOTS), + mCurrentTexture(INVALID_BUFFER_SLOT), + mNextTransform(0), + mNextScalingMode(NATIVE_WINDOW_SCALING_MODE_FREEZE), + mSynchronousMode(false), + mAllowSynchronousMode(allowSynchronousMode), + mConnectedApi(NO_CONNECTED_API), + mAbandoned(false), + mFrameCounter(0) +{ + // Choose a name using the PID and a process-unique ID. + mName = String8::format("unnamed-%d-%d", getpid(), createProcessUniqueId()); + + ST_LOGV("BufferQueue"); + sp<ISurfaceComposer> composer(ComposerService::getComposerService()); + mGraphicBufferAlloc = composer->createGraphicBufferAlloc(); + mNextCrop.makeInvalid(); +} + +BufferQueue::~BufferQueue() { + ST_LOGV("~BufferQueue"); +} + +status_t BufferQueue::setBufferCountServerLocked(int bufferCount) { + if (bufferCount > NUM_BUFFER_SLOTS) + return BAD_VALUE; + + // special-case, nothing to do + if (bufferCount == mBufferCount) + return OK; + + if (!mClientBufferCount && + bufferCount >= mBufferCount) { + // easy, we just have more buffers + mBufferCount = bufferCount; + mServerBufferCount = bufferCount; + mDequeueCondition.signal(); + } else { + // we're here because we're either + // - reducing the number of available buffers + // - or there is a client-buffer-count in effect + + // less than 2 buffers is never allowed + if (bufferCount < 2) + return BAD_VALUE; + + // when there is non client-buffer-count in effect, the client is not + // allowed to dequeue more than one buffer at a time, + // so the next time they dequeue a buffer, we know that they don't + // own one. the actual resizing will happen during the next + // dequeueBuffer. + + mServerBufferCount = bufferCount; + } + return OK; +} + +status_t BufferQueue::setBufferCount(int bufferCount) { + ST_LOGV("setBufferCount: count=%d", bufferCount); + Mutex::Autolock lock(mMutex); + + if (mAbandoned) { + ST_LOGE("setBufferCount: SurfaceTexture has been abandoned!"); + return NO_INIT; + } + if (bufferCount > NUM_BUFFER_SLOTS) { + ST_LOGE("setBufferCount: bufferCount larger than slots available"); + return BAD_VALUE; + } + + // Error out if the user has dequeued buffers + for (int i=0 ; i<mBufferCount ; i++) { + if (mSlots[i].mBufferState == BufferSlot::DEQUEUED) { + ST_LOGE("setBufferCount: client owns some buffers"); + return -EINVAL; + } + } + + const int minBufferSlots = mSynchronousMode ? + MIN_SYNC_BUFFER_SLOTS : MIN_ASYNC_BUFFER_SLOTS; + if (bufferCount == 0) { + mClientBufferCount = 0; + bufferCount = (mServerBufferCount >= minBufferSlots) ? + mServerBufferCount : minBufferSlots; + return setBufferCountServerLocked(bufferCount); + } + + if (bufferCount < minBufferSlots) { + ST_LOGE("setBufferCount: requested buffer count (%d) is less than " + "minimum (%d)", bufferCount, minBufferSlots); + return BAD_VALUE; + } + + // here we're guaranteed that the client doesn't have dequeued buffers + // and will release all of its buffer references. + freeAllBuffersLocked(); + mBufferCount = bufferCount; + mClientBufferCount = bufferCount; + mCurrentTexture = INVALID_BUFFER_SLOT; + mQueue.clear(); + mDequeueCondition.signal(); + return OK; +} + +status_t BufferQueue::requestBuffer(int slot, sp<GraphicBuffer>* buf) { + ST_LOGV("requestBuffer: slot=%d", slot); + Mutex::Autolock lock(mMutex); + if (mAbandoned) { + ST_LOGE("requestBuffer: SurfaceTexture has been abandoned!"); + return NO_INIT; + } + if (slot < 0 || mBufferCount <= slot) { + ST_LOGE("requestBuffer: slot index out of range [0, %d]: %d", + mBufferCount, slot); + return BAD_VALUE; + } + mSlots[slot].mRequestBufferCalled = true; + *buf = mSlots[slot].mGraphicBuffer; + return NO_ERROR; +} + +status_t BufferQueue::dequeueBuffer(int *outBuf, uint32_t w, uint32_t h, + uint32_t format, uint32_t usage) { + ST_LOGV("dequeueBuffer: w=%d h=%d fmt=%#x usage=%#x", w, h, format, usage); + + if ((w && !h) || (!w && h)) { + ST_LOGE("dequeueBuffer: invalid size: w=%u, h=%u", w, h); + return BAD_VALUE; + } + + status_t returnFlags(OK); + EGLDisplay dpy = EGL_NO_DISPLAY; + EGLSyncKHR fence = EGL_NO_SYNC_KHR; + + { // Scope for the lock + Mutex::Autolock lock(mMutex); + + int found = -1; + int foundSync = -1; + int dequeuedCount = 0; + bool tryAgain = true; + while (tryAgain) { + if (mAbandoned) { + ST_LOGE("dequeueBuffer: SurfaceTexture has been abandoned!"); + return NO_INIT; + } + + // We need to wait for the FIFO to drain if the number of buffer + // needs to change. + // + // The condition "number of buffers needs to change" is true if + // - the client doesn't care about how many buffers there are + // - AND the actual number of buffer is different from what was + // set in the last setBufferCountServer() + // - OR - + // setBufferCountServer() was set to a value incompatible with + // the synchronization mode (for instance because the sync mode + // changed since) + // + // As long as this condition is true AND the FIFO is not empty, we + // wait on mDequeueCondition. + + const int minBufferCountNeeded = mSynchronousMode ? + MIN_SYNC_BUFFER_SLOTS : MIN_ASYNC_BUFFER_SLOTS; + + const bool numberOfBuffersNeedsToChange = !mClientBufferCount && + ((mServerBufferCount != mBufferCount) || + (mServerBufferCount < minBufferCountNeeded)); + + if (!mQueue.isEmpty() && numberOfBuffersNeedsToChange) { + // wait for the FIFO to drain + mDequeueCondition.wait(mMutex); + // NOTE: we continue here because we need to reevaluate our + // whole state (eg: we could be abandoned or disconnected) + continue; + } + + if (numberOfBuffersNeedsToChange) { + // here we're guaranteed that mQueue is empty + freeAllBuffersLocked(); + mBufferCount = mServerBufferCount; + if (mBufferCount < minBufferCountNeeded) + mBufferCount = minBufferCountNeeded; + mCurrentTexture = INVALID_BUFFER_SLOT; + returnFlags |= ISurfaceTexture::RELEASE_ALL_BUFFERS; + } + + // look for a free buffer to give to the client + found = INVALID_BUFFER_SLOT; + foundSync = INVALID_BUFFER_SLOT; + dequeuedCount = 0; + for (int i = 0; i < mBufferCount; i++) { + const int state = mSlots[i].mBufferState; + if (state == BufferSlot::DEQUEUED) { + dequeuedCount++; + } + + // if buffer is FREE it CANNOT be current + ALOGW_IF((state == BufferSlot::FREE) && (mCurrentTexture==i), + "dequeueBuffer: buffer %d is both FREE and current!", + i); + + if (FLAG_ALLOW_DEQUEUE_CURRENT_BUFFER) { + if (state == BufferSlot::FREE || i == mCurrentTexture) { + foundSync = i; + if (i != mCurrentTexture) { + found = i; + break; + } + } + } else { + if (state == BufferSlot::FREE) { + /* We return the oldest of the free buffers to avoid + * stalling the producer if possible. This is because + * the consumer may still have pending reads of the + * buffers in flight. + */ + bool isOlder = mSlots[i].mFrameNumber < + mSlots[found].mFrameNumber; + if (found < 0 || isOlder) { + foundSync = i; + found = i; + } + } + } + } + + // clients are not allowed to dequeue more than one buffer + // if they didn't set a buffer count. + if (!mClientBufferCount && dequeuedCount) { + ST_LOGE("dequeueBuffer: can't dequeue multiple buffers without " + "setting the buffer count"); + return -EINVAL; + } + + // See whether a buffer has been queued since the last + // setBufferCount so we know whether to perform the + // MIN_UNDEQUEUED_BUFFERS check below. + bool bufferHasBeenQueued = mCurrentTexture != INVALID_BUFFER_SLOT; + if (bufferHasBeenQueued) { + // make sure the client is not trying to dequeue more buffers + // than allowed. + const int avail = mBufferCount - (dequeuedCount+1); + if (avail < (MIN_UNDEQUEUED_BUFFERS-int(mSynchronousMode))) { + ST_LOGE("dequeueBuffer: MIN_UNDEQUEUED_BUFFERS=%d exceeded " + "(dequeued=%d)", + MIN_UNDEQUEUED_BUFFERS-int(mSynchronousMode), + dequeuedCount); + return -EBUSY; + } + } + + // we're in synchronous mode and didn't find a buffer, we need to + // wait for some buffers to be consumed + tryAgain = mSynchronousMode && (foundSync == INVALID_BUFFER_SLOT); + if (tryAgain) { + mDequeueCondition.wait(mMutex); + } + } + + if (mSynchronousMode && found == INVALID_BUFFER_SLOT) { + // foundSync guaranteed to be != INVALID_BUFFER_SLOT + found = foundSync; + } + + if (found == INVALID_BUFFER_SLOT) { + // This should not happen. + ST_LOGE("dequeueBuffer: no available buffer slots"); + return -EBUSY; + } + + const int buf = found; + *outBuf = found; + + const bool useDefaultSize = !w && !h; + if (useDefaultSize) { + // use the default size + w = mDefaultWidth; + h = mDefaultHeight; + } + + const bool updateFormat = (format != 0); + if (!updateFormat) { + // keep the current (or default) format + format = mPixelFormat; + } + + // buffer is now in DEQUEUED (but can also be current at the same time, + // if we're in synchronous mode) + mSlots[buf].mBufferState = BufferSlot::DEQUEUED; + + const sp<GraphicBuffer>& buffer(mSlots[buf].mGraphicBuffer); + if ((buffer == NULL) || + (uint32_t(buffer->width) != w) || + (uint32_t(buffer->height) != h) || + (uint32_t(buffer->format) != format) || + ((uint32_t(buffer->usage) & usage) != usage)) + { + usage |= GraphicBuffer::USAGE_HW_TEXTURE; + status_t error; + sp<GraphicBuffer> graphicBuffer( + mGraphicBufferAlloc->createGraphicBuffer( + w, h, format, usage, &error)); + if (graphicBuffer == 0) { + ST_LOGE("dequeueBuffer: SurfaceComposer::createGraphicBuffer " + "failed"); + return error; + } + if (updateFormat) { + mPixelFormat = format; + } + mSlots[buf].mGraphicBuffer = graphicBuffer; + mSlots[buf].mRequestBufferCalled = false; + mSlots[buf].mFence = EGL_NO_SYNC_KHR; + if (mSlots[buf].mEglImage != EGL_NO_IMAGE_KHR) { + eglDestroyImageKHR(mSlots[buf].mEglDisplay, + mSlots[buf].mEglImage); + mSlots[buf].mEglImage = EGL_NO_IMAGE_KHR; + mSlots[buf].mEglDisplay = EGL_NO_DISPLAY; + } + if (mCurrentTexture == buf) { + // The current texture no longer references the buffer in this slot + // since we just allocated a new buffer. + mCurrentTexture = INVALID_BUFFER_SLOT; + } + returnFlags |= ISurfaceTexture::BUFFER_NEEDS_REALLOCATION; + } + + dpy = mSlots[buf].mEglDisplay; + fence = mSlots[buf].mFence; + mSlots[buf].mFence = EGL_NO_SYNC_KHR; + } + + if (fence != EGL_NO_SYNC_KHR) { + EGLint result = eglClientWaitSyncKHR(dpy, fence, 0, 1000000000); + // If something goes wrong, log the error, but return the buffer without + // synchronizing access to it. It's too late at this point to abort the + // dequeue operation. + if (result == EGL_FALSE) { + ALOGE("dequeueBuffer: error waiting for fence: %#x", eglGetError()); + } else if (result == EGL_TIMEOUT_EXPIRED_KHR) { + ALOGE("dequeueBuffer: timeout waiting for fence"); + } + eglDestroySyncKHR(dpy, fence); + } + + ST_LOGV("dequeueBuffer: returning slot=%d buf=%p flags=%#x", *outBuf, + mSlots[*outBuf].mGraphicBuffer->handle, returnFlags); + + return returnFlags; +} + +status_t BufferQueue::setSynchronousMode(bool enabled) { + ST_LOGV("setSynchronousMode: enabled=%d", enabled); + Mutex::Autolock lock(mMutex); + + if (mAbandoned) { + ST_LOGE("setSynchronousMode: SurfaceTexture has been abandoned!"); + return NO_INIT; + } + + status_t err = OK; + if (!mAllowSynchronousMode && enabled) + return err; + + if (!enabled) { + // going to asynchronous mode, drain the queue + err = drainQueueLocked(); + if (err != NO_ERROR) + return err; + } + + if (mSynchronousMode != enabled) { + // - if we're going to asynchronous mode, the queue is guaranteed to be + // empty here + // - if the client set the number of buffers, we're guaranteed that + // we have at least 3 (because we don't allow less) + mSynchronousMode = enabled; + mDequeueCondition.signal(); + } + return err; +} + +status_t BufferQueue::queueBuffer(int buf, int64_t timestamp, + uint32_t* outWidth, uint32_t* outHeight, uint32_t* outTransform) { + ST_LOGV("queueBuffer: slot=%d time=%lld", buf, timestamp); + + sp<FrameAvailableListener> listener; + + { // scope for the lock + Mutex::Autolock lock(mMutex); + if (mAbandoned) { + ST_LOGE("queueBuffer: SurfaceTexture has been abandoned!"); + return NO_INIT; + } + if (buf < 0 || buf >= mBufferCount) { + ST_LOGE("queueBuffer: slot index out of range [0, %d]: %d", + mBufferCount, buf); + return -EINVAL; + } else if (mSlots[buf].mBufferState != BufferSlot::DEQUEUED) { + ST_LOGE("queueBuffer: slot %d is not owned by the client " + "(state=%d)", buf, mSlots[buf].mBufferState); + return -EINVAL; + } else if (buf == mCurrentTexture) { + ST_LOGE("queueBuffer: slot %d is current!", buf); + return -EINVAL; + } else if (!mSlots[buf].mRequestBufferCalled) { + ST_LOGE("queueBuffer: slot %d was enqueued without requesting a " + "buffer", buf); + return -EINVAL; + } + + if (mSynchronousMode) { + // In synchronous mode we queue all buffers in a FIFO. + mQueue.push_back(buf); + + // Synchronous mode always signals that an additional frame should + // be consumed. + listener = mFrameAvailableListener; + } else { + // In asynchronous mode we only keep the most recent buffer. + if (mQueue.empty()) { + mQueue.push_back(buf); + + // Asynchronous mode only signals that a frame should be + // consumed if no previous frame was pending. If a frame were + // pending then the consumer would have already been notified. + listener = mFrameAvailableListener; + } else { + Fifo::iterator front(mQueue.begin()); + // buffer currently queued is freed + mSlots[*front].mBufferState = BufferSlot::FREE; + // and we record the new buffer index in the queued list + *front = buf; + } + } + + mSlots[buf].mBufferState = BufferSlot::QUEUED; + mSlots[buf].mCrop = mNextCrop; + mSlots[buf].mTransform = mNextTransform; + mSlots[buf].mScalingMode = mNextScalingMode; + mSlots[buf].mTimestamp = timestamp; + mFrameCounter++; + mSlots[buf].mFrameNumber = mFrameCounter; + + mDequeueCondition.signal(); + + *outWidth = mDefaultWidth; + *outHeight = mDefaultHeight; + *outTransform = 0; + } // scope for the lock + + // call back without lock held + if (listener != 0) { + listener->onFrameAvailable(); + } + return OK; +} + +void BufferQueue::cancelBuffer(int buf) { + ST_LOGV("cancelBuffer: slot=%d", buf); + Mutex::Autolock lock(mMutex); + + if (mAbandoned) { + ST_LOGW("cancelBuffer: BufferQueue has been abandoned!"); + return; + } + + if (buf < 0 || buf >= mBufferCount) { + ST_LOGE("cancelBuffer: slot index out of range [0, %d]: %d", + mBufferCount, buf); + return; + } else if (mSlots[buf].mBufferState != BufferSlot::DEQUEUED) { + ST_LOGE("cancelBuffer: slot %d is not owned by the client (state=%d)", + buf, mSlots[buf].mBufferState); + return; + } + mSlots[buf].mBufferState = BufferSlot::FREE; + mSlots[buf].mFrameNumber = 0; + mDequeueCondition.signal(); +} + +status_t BufferQueue::setCrop(const Rect& crop) { + ST_LOGV("setCrop: crop=[%d,%d,%d,%d]", crop.left, crop.top, crop.right, + crop.bottom); + + Mutex::Autolock lock(mMutex); + if (mAbandoned) { + ST_LOGE("setCrop: BufferQueue has been abandoned!"); + return NO_INIT; + } + mNextCrop = crop; + return OK; +} + +status_t BufferQueue::setTransform(uint32_t transform) { + ST_LOGV("setTransform: xform=%#x", transform); + Mutex::Autolock lock(mMutex); + if (mAbandoned) { + ST_LOGE("setTransform: BufferQueue has been abandoned!"); + return NO_INIT; + } + mNextTransform = transform; + return OK; +} + +status_t BufferQueue::setScalingMode(int mode) { + ST_LOGV("setScalingMode: mode=%d", mode); + + switch (mode) { + case NATIVE_WINDOW_SCALING_MODE_FREEZE: + case NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW: + break; + default: + ST_LOGE("unknown scaling mode: %d", mode); + return BAD_VALUE; + } + + Mutex::Autolock lock(mMutex); + mNextScalingMode = mode; + return OK; +} + +status_t BufferQueue::connect(int api, + uint32_t* outWidth, uint32_t* outHeight, uint32_t* outTransform) { + ST_LOGV("connect: api=%d", api); + Mutex::Autolock lock(mMutex); + + if (mAbandoned) { + ST_LOGE("connect: BufferQueue has been abandoned!"); + return NO_INIT; + } + + int err = NO_ERROR; + switch (api) { + case NATIVE_WINDOW_API_EGL: + case NATIVE_WINDOW_API_CPU: + case NATIVE_WINDOW_API_MEDIA: + case NATIVE_WINDOW_API_CAMERA: + if (mConnectedApi != NO_CONNECTED_API) { + ST_LOGE("connect: already connected (cur=%d, req=%d)", + mConnectedApi, api); + err = -EINVAL; + } else { + mConnectedApi = api; + *outWidth = mDefaultWidth; + *outHeight = mDefaultHeight; + *outTransform = 0; + } + break; + default: + err = -EINVAL; + break; + } + return err; +} + +status_t BufferQueue::disconnect(int api) { + ST_LOGV("disconnect: api=%d", api); + Mutex::Autolock lock(mMutex); + + if (mAbandoned) { + // it is not really an error to disconnect after the surface + // has been abandoned, it should just be a no-op. + return NO_ERROR; + } + + int err = NO_ERROR; + switch (api) { + case NATIVE_WINDOW_API_EGL: + case NATIVE_WINDOW_API_CPU: + case NATIVE_WINDOW_API_MEDIA: + case NATIVE_WINDOW_API_CAMERA: + if (mConnectedApi == api) { + drainQueueAndFreeBuffersLocked(); + mConnectedApi = NO_CONNECTED_API; + mNextCrop.makeInvalid(); + mNextScalingMode = NATIVE_WINDOW_SCALING_MODE_FREEZE; + mNextTransform = 0; + mDequeueCondition.signal(); + } else { + ST_LOGE("disconnect: connected to another api (cur=%d, req=%d)", + mConnectedApi, api); + err = -EINVAL; + } + break; + default: + ST_LOGE("disconnect: unknown API %d", api); + err = -EINVAL; + break; + } + return err; +} + +void BufferQueue::freeBufferLocked(int i) { + mSlots[i].mGraphicBuffer = 0; + mSlots[i].mBufferState = BufferSlot::FREE; + mSlots[i].mFrameNumber = 0; + if (mSlots[i].mEglImage != EGL_NO_IMAGE_KHR) { + eglDestroyImageKHR(mSlots[i].mEglDisplay, mSlots[i].mEglImage); + mSlots[i].mEglImage = EGL_NO_IMAGE_KHR; + mSlots[i].mEglDisplay = EGL_NO_DISPLAY; + } +} + +void BufferQueue::freeAllBuffersLocked() { + ALOGW_IF(!mQueue.isEmpty(), + "freeAllBuffersLocked called but mQueue is not empty"); + mCurrentTexture = INVALID_BUFFER_SLOT; + for (int i = 0; i < NUM_BUFFER_SLOTS; i++) { + freeBufferLocked(i); + } +} + +void BufferQueue::freeAllBuffersExceptHeadLocked() { + ALOGW_IF(!mQueue.isEmpty(), + "freeAllBuffersExceptCurrentLocked called but mQueue is not empty"); + int head = -1; + if (!mQueue.empty()) { + Fifo::iterator front(mQueue.begin()); + head = *front; + } + mCurrentTexture = INVALID_BUFFER_SLOT; + for (int i = 0; i < NUM_BUFFER_SLOTS; i++) { + if (i != head) { + freeBufferLocked(i); + } + } +} + +status_t BufferQueue::drainQueueLocked() { + while (mSynchronousMode && !mQueue.isEmpty()) { + mDequeueCondition.wait(mMutex); + if (mAbandoned) { + ST_LOGE("drainQueueLocked: BufferQueue has been abandoned!"); + return NO_INIT; + } + if (mConnectedApi == NO_CONNECTED_API) { + ST_LOGE("drainQueueLocked: BufferQueue is not connected!"); + return NO_INIT; + } + } + return NO_ERROR; +} + +status_t BufferQueue::drainQueueAndFreeBuffersLocked() { + status_t err = drainQueueLocked(); + if (err == NO_ERROR) { + if (mSynchronousMode) { + freeAllBuffersLocked(); + } else { + freeAllBuffersExceptHeadLocked(); + } + } + return err; +} + +}; // namespace android |