1 /*
2 * Copyright 2014 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 #define LOG_TAG "BufferQueueCore"
18 #define ATRACE_TAG ATRACE_TAG_GRAPHICS
19 //#define LOG_NDEBUG 0
20
21 #define EGL_EGLEXT_PROTOTYPES
22
23 #include <inttypes.h>
24
25 #include <gui/BufferItem.h>
26 #include <gui/BufferQueueCore.h>
27 #include <gui/IConsumerListener.h>
28 #include <gui/IGraphicBufferAlloc.h>
29 #include <gui/IProducerListener.h>
30 #include <gui/ISurfaceComposer.h>
31 #include <private/gui/ComposerService.h>
32
33 template <typename T>
max(T a,T b)34 static inline T max(T a, T b) { return a > b ? a : b; }
35
36 namespace android {
37
getUniqueName()38 static String8 getUniqueName() {
39 static volatile int32_t counter = 0;
40 return String8::format("unnamed-%d-%d", getpid(),
41 android_atomic_inc(&counter));
42 }
43
BufferQueueCore(const sp<IGraphicBufferAlloc> & allocator)44 BufferQueueCore::BufferQueueCore(const sp<IGraphicBufferAlloc>& allocator) :
45 mAllocator(allocator),
46 mMutex(),
47 mIsAbandoned(false),
48 mConsumerControlledByApp(false),
49 mConsumerName(getUniqueName()),
50 mConsumerListener(),
51 mConsumerUsageBits(0),
52 mConnectedApi(NO_CONNECTED_API),
53 mConnectedProducerListener(),
54 mSlots(),
55 mQueue(),
56 mOverrideMaxBufferCount(0),
57 mDequeueCondition(),
58 mUseAsyncBuffer(true),
59 mDequeueBufferCannotBlock(false),
60 mDefaultBufferFormat(PIXEL_FORMAT_RGBA_8888),
61 mDefaultWidth(1),
62 mDefaultHeight(1),
63 mDefaultMaxBufferCount(2),
64 mMaxAcquiredBufferCount(1),
65 mBufferHasBeenQueued(false),
66 mFrameCounter(0),
67 mTransformHint(0),
68 mIsAllocating(false),
69 mIsAllocatingCondition()
70 {
71 if (allocator == NULL) {
72 sp<ISurfaceComposer> composer(ComposerService::getComposerService());
73 mAllocator = composer->createGraphicBufferAlloc();
74 if (mAllocator == NULL) {
75 BQ_LOGE("createGraphicBufferAlloc failed");
76 }
77 }
78 }
79
~BufferQueueCore()80 BufferQueueCore::~BufferQueueCore() {}
81
dump(String8 & result,const char * prefix) const82 void BufferQueueCore::dump(String8& result, const char* prefix) const {
83 Mutex::Autolock lock(mMutex);
84
85 String8 fifo;
86 Fifo::const_iterator current(mQueue.begin());
87 while (current != mQueue.end()) {
88 fifo.appendFormat("%02d:%p crop=[%d,%d,%d,%d], "
89 "xform=0x%02x, time=%#" PRIx64 ", scale=%s\n",
90 current->mSlot, current->mGraphicBuffer.get(),
91 current->mCrop.left, current->mCrop.top, current->mCrop.right,
92 current->mCrop.bottom, current->mTransform, current->mTimestamp,
93 BufferItem::scalingModeName(current->mScalingMode));
94 ++current;
95 }
96
97 result.appendFormat("%s-BufferQueue mMaxAcquiredBufferCount=%d, "
98 "mDequeueBufferCannotBlock=%d, default-size=[%dx%d], "
99 "default-format=%d, transform-hint=%02x, FIFO(%zu)={%s}\n",
100 prefix, mMaxAcquiredBufferCount, mDequeueBufferCannotBlock,
101 mDefaultWidth, mDefaultHeight, mDefaultBufferFormat, mTransformHint,
102 mQueue.size(), fifo.string());
103
104 // Trim the free buffers so as to not spam the dump
105 int maxBufferCount = 0;
106 for (int s = BufferQueueDefs::NUM_BUFFER_SLOTS - 1; s >= 0; --s) {
107 const BufferSlot& slot(mSlots[s]);
108 if (slot.mBufferState != BufferSlot::FREE ||
109 slot.mGraphicBuffer != NULL) {
110 maxBufferCount = s + 1;
111 break;
112 }
113 }
114
115 for (int s = 0; s < maxBufferCount; ++s) {
116 const BufferSlot& slot(mSlots[s]);
117 const sp<GraphicBuffer>& buffer(slot.mGraphicBuffer);
118 result.appendFormat("%s%s[%02d:%p] state=%-8s", prefix,
119 (slot.mBufferState == BufferSlot::ACQUIRED) ? ">" : " ",
120 s, buffer.get(),
121 BufferSlot::bufferStateName(slot.mBufferState));
122
123 if (buffer != NULL) {
124 result.appendFormat(", %p [%4ux%4u:%4u,%3X]", buffer->handle,
125 buffer->width, buffer->height, buffer->stride,
126 buffer->format);
127 }
128
129 result.append("\n");
130 }
131 }
132
getMinUndequeuedBufferCountLocked(bool async) const133 int BufferQueueCore::getMinUndequeuedBufferCountLocked(bool async) const {
134 // If dequeueBuffer is allowed to error out, we don't have to add an
135 // extra buffer.
136 if (!mUseAsyncBuffer) {
137 return mMaxAcquiredBufferCount;
138 }
139
140 if (mDequeueBufferCannotBlock || async) {
141 return mMaxAcquiredBufferCount + 1;
142 }
143
144 return mMaxAcquiredBufferCount;
145 }
146
getMinMaxBufferCountLocked(bool async) const147 int BufferQueueCore::getMinMaxBufferCountLocked(bool async) const {
148 return getMinUndequeuedBufferCountLocked(async) + 1;
149 }
150
getMaxBufferCountLocked(bool async) const151 int BufferQueueCore::getMaxBufferCountLocked(bool async) const {
152 int minMaxBufferCount = getMinMaxBufferCountLocked(async);
153
154 int maxBufferCount = max(mDefaultMaxBufferCount, minMaxBufferCount);
155 if (mOverrideMaxBufferCount != 0) {
156 assert(mOverrideMaxBufferCount >= minMaxBufferCount);
157 maxBufferCount = mOverrideMaxBufferCount;
158 }
159
160 // Any buffers that are dequeued by the producer or sitting in the queue
161 // waiting to be consumed need to have their slots preserved. Such buffers
162 // will temporarily keep the max buffer count up until the slots no longer
163 // need to be preserved.
164 for (int s = maxBufferCount; s < BufferQueueDefs::NUM_BUFFER_SLOTS; ++s) {
165 BufferSlot::BufferState state = mSlots[s].mBufferState;
166 if (state == BufferSlot::QUEUED || state == BufferSlot::DEQUEUED) {
167 maxBufferCount = s + 1;
168 }
169 }
170
171 return maxBufferCount;
172 }
173
setDefaultMaxBufferCountLocked(int count)174 status_t BufferQueueCore::setDefaultMaxBufferCountLocked(int count) {
175 const int minBufferCount = mUseAsyncBuffer ? 2 : 1;
176 if (count < minBufferCount || count > BufferQueueDefs::NUM_BUFFER_SLOTS) {
177 BQ_LOGV("setDefaultMaxBufferCount: invalid count %d, should be in "
178 "[%d, %d]",
179 count, minBufferCount, BufferQueueDefs::NUM_BUFFER_SLOTS);
180 return BAD_VALUE;
181 }
182
183 BQ_LOGV("setDefaultMaxBufferCount: setting count to %d", count);
184 mDefaultMaxBufferCount = count;
185 mDequeueCondition.broadcast();
186
187 return NO_ERROR;
188 }
189
freeBufferLocked(int slot)190 void BufferQueueCore::freeBufferLocked(int slot) {
191 BQ_LOGV("freeBufferLocked: slot %d", slot);
192 mSlots[slot].mGraphicBuffer.clear();
193 if (mSlots[slot].mBufferState == BufferSlot::ACQUIRED) {
194 mSlots[slot].mNeedsCleanupOnRelease = true;
195 }
196 mSlots[slot].mBufferState = BufferSlot::FREE;
197 mSlots[slot].mFrameNumber = UINT32_MAX;
198 mSlots[slot].mAcquireCalled = false;
199
200 // Destroy fence as BufferQueue now takes ownership
201 if (mSlots[slot].mEglFence != EGL_NO_SYNC_KHR) {
202 eglDestroySyncKHR(mSlots[slot].mEglDisplay, mSlots[slot].mEglFence);
203 mSlots[slot].mEglFence = EGL_NO_SYNC_KHR;
204 }
205 mSlots[slot].mFence = Fence::NO_FENCE;
206 }
207
freeAllBuffersLocked()208 void BufferQueueCore::freeAllBuffersLocked() {
209 mBufferHasBeenQueued = false;
210 for (int s = 0; s < BufferQueueDefs::NUM_BUFFER_SLOTS; ++s) {
211 freeBufferLocked(s);
212 }
213 }
214
stillTracking(const BufferItem * item) const215 bool BufferQueueCore::stillTracking(const BufferItem* item) const {
216 const BufferSlot& slot = mSlots[item->mSlot];
217
218 BQ_LOGV("stillTracking: item { slot=%d/%" PRIu64 " buffer=%p } "
219 "slot { slot=%d/%" PRIu64 " buffer=%p }",
220 item->mSlot, item->mFrameNumber,
221 (item->mGraphicBuffer.get() ? item->mGraphicBuffer->handle : 0),
222 item->mSlot, slot.mFrameNumber,
223 (slot.mGraphicBuffer.get() ? slot.mGraphicBuffer->handle : 0));
224
225 // Compare item with its original buffer slot. We can check the slot as
226 // the buffer would not be moved to a different slot by the producer.
227 return (slot.mGraphicBuffer != NULL) &&
228 (item->mGraphicBuffer->handle == slot.mGraphicBuffer->handle);
229 }
230
waitWhileAllocatingLocked() const231 void BufferQueueCore::waitWhileAllocatingLocked() const {
232 ATRACE_CALL();
233 while (mIsAllocating) {
234 mIsAllocatingCondition.wait(mMutex);
235 }
236 }
237
238 } // namespace android
239