BufferQueueCore.cpp revision f0eaf25e9247edf4d124bedaeb863f7abdf35a3e 
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 <gui/BufferItem.h>
24#include <gui/BufferQueueCore.h>
25#include <gui/IConsumerListener.h>
26#include <gui/IGraphicBufferAlloc.h>
27#include <gui/IProducerListener.h>
28#include <gui/ISurfaceComposer.h>
29#include <private/gui/ComposerService.h>
30
31template <typename T>
32static inline T max(T a, T b) { return a > b ? a : b; }
33
34namespace android {
35
36static String8 getUniqueName() {
37    static volatile int32_t counter = 0;
38    return String8::format("unnamed-%d-%d", getpid(),
39            android_atomic_inc(&counter));
40}
41
42BufferQueueCore::BufferQueueCore(const sp<IGraphicBufferAlloc>& allocator) :
43    mAllocator(allocator),
44    mMutex(),
45    mIsAbandoned(false),
46    mConsumerControlledByApp(false),
47    mConsumerName(getUniqueName()),
48    mConsumerListener(),
49    mConsumerUsageBits(0),
50    mConnectedApi(NO_CONNECTED_API),
51    mConnectedProducerListener(),
52    mSlots(),
53    mQueue(),
54    mOverrideMaxBufferCount(0),
55    mDequeueCondition(),
56    mUseAsyncBuffer(true),
57    mDequeueBufferCannotBlock(false),
58    mDefaultBufferFormat(PIXEL_FORMAT_RGBA_8888),
59    mDefaultWidth(1),
60    mDefaultHeight(1),
61    mDefaultMaxBufferCount(2),
62    mMaxAcquiredBufferCount(1),
63    mBufferHasBeenQueued(false),
64    mFrameCounter(0),
65    mTransformHint(0)
66{
67    if (allocator == NULL) {
68        sp<ISurfaceComposer> composer(ComposerService::getComposerService());
69        mAllocator = composer->createGraphicBufferAlloc();
70        if (mAllocator == NULL) {
71            BQ_LOGE("createGraphicBufferAlloc failed");
72        }
73    }
74}
75
76BufferQueueCore::~BufferQueueCore() {}
77
78void BufferQueueCore::dump(String8& result, const char* prefix) const {
79    Mutex::Autolock lock(mMutex);
80
81    String8 fifo;
82    Fifo::const_iterator current(mQueue.begin());
83    while (current != mQueue.end()) {
84        fifo.appendFormat("%02d:%p crop=[%d,%d,%d,%d], "
85                "xform=0x%02x, time=%#llx, scale=%s\n",
86                current->mSlot, current->mGraphicBuffer.get(),
87                current->mCrop.left, current->mCrop.top, current->mCrop.right,
88                current->mCrop.bottom, current->mTransform, current->mTimestamp,
89                BufferItem::scalingModeName(current->mScalingMode));
90        ++current;
91    }
92
93    result.appendFormat("%s-BufferQueue mMaxAcquiredBufferCount=%d, "
94            "mDequeueBufferCannotBlock=%d, default-size=[%dx%d], "
95            "default-format=%d, transform-hint=%02x, FIFO(%d)={%s}\n",
96            prefix, mMaxAcquiredBufferCount, mDequeueBufferCannotBlock,
97            mDefaultWidth, mDefaultHeight, mDefaultBufferFormat, mTransformHint,
98            mQueue.size(), fifo.string());
99
100    // Trim the free buffers so as to not spam the dump
101    int maxBufferCount = 0;
102    for (int s = BufferQueueDefs::NUM_BUFFER_SLOTS - 1; s >= 0; --s) {
103        const BufferSlot& slot(mSlots[s]);
104        if (slot.mBufferState != BufferSlot::FREE ||
105                slot.mGraphicBuffer != NULL) {
106            maxBufferCount = s + 1;
107            break;
108        }
109    }
110
111    for (int s = 0; s < maxBufferCount; ++s) {
112        const BufferSlot& slot(mSlots[s]);
113        const sp<GraphicBuffer>& buffer(slot.mGraphicBuffer);
114        result.appendFormat("%s%s[%02d:%p] state=%-8s", prefix,
115                (slot.mBufferState == BufferSlot::ACQUIRED) ? ">" : " ",
116                s, buffer.get(),
117                BufferSlot::bufferStateName(slot.mBufferState));
118
119        if (buffer != NULL) {
120            result.appendFormat(", %p [%4ux%4u:%4u,%3X]", buffer->handle,
121                    buffer->width, buffer->height, buffer->stride,
122                    buffer->format);
123        }
124
125        result.append("\n");
126    }
127}
128
129int BufferQueueCore::getMinUndequeuedBufferCountLocked(bool async) const {
130    // If dequeueBuffer is allowed to error out, we don't have to add an
131    // extra buffer.
132    if (!mUseAsyncBuffer) {
133        return mMaxAcquiredBufferCount;
134    }
135
136    if (mDequeueBufferCannotBlock || async) {
137        return mMaxAcquiredBufferCount + 1;
138    }
139
140    return mMaxAcquiredBufferCount;
141}
142
143int BufferQueueCore::getMinMaxBufferCountLocked(bool async) const {
144    return getMinUndequeuedBufferCountLocked(async) + 1;
145}
146
147int BufferQueueCore::getMaxBufferCountLocked(bool async) const {
148    int minMaxBufferCount = getMinMaxBufferCountLocked(async);
149
150    int maxBufferCount = max(mDefaultMaxBufferCount, minMaxBufferCount);
151    if (mOverrideMaxBufferCount != 0) {
152        assert(mOverrideMaxBufferCount >= minMaxBufferCount);
153        maxBufferCount = mOverrideMaxBufferCount;
154    }
155
156    // Any buffers that are dequeued by the producer or sitting in the queue
157    // waiting to be consumed need to have their slots preserved. Such buffers
158    // will temporarily keep the max buffer count up until the slots no longer
159    // need to be preserved.
160    for (int s = maxBufferCount; s < BufferQueueDefs::NUM_BUFFER_SLOTS; ++s) {
161        BufferSlot::BufferState state = mSlots[s].mBufferState;
162        if (state == BufferSlot::QUEUED || state == BufferSlot::DEQUEUED) {
163            maxBufferCount = s + 1;
164        }
165    }
166
167    return maxBufferCount;
168}
169
170status_t BufferQueueCore::setDefaultMaxBufferCountLocked(int count) {
171    const int minBufferCount = mUseAsyncBuffer ? 2 : 1;
172    if (count < minBufferCount || count > BufferQueueDefs::NUM_BUFFER_SLOTS) {
173        BQ_LOGV("setDefaultMaxBufferCount: invalid count %d, should be in "
174                "[%d, %d]", minBufferCount, BufferQueueDefs::NUM_BUFFER_SLOTS);
175        return BAD_VALUE;
176    }
177
178    BQ_LOGV("setDefaultMaxBufferCount: setting count to %d", count);
179    mDefaultMaxBufferCount = count;
180    mDequeueCondition.broadcast();
181
182    return NO_ERROR;
183}
184
185void BufferQueueCore::freeBufferLocked(int slot) {
186    BQ_LOGV("freeBufferLocked: slot %d", slot);
187    mSlots[slot].mGraphicBuffer.clear();
188    if (mSlots[slot].mBufferState == BufferSlot::ACQUIRED) {
189        mSlots[slot].mNeedsCleanupOnRelease = true;
190    }
191    mSlots[slot].mBufferState = BufferSlot::FREE;
192    mSlots[slot].mFrameNumber = 0;
193    mSlots[slot].mAcquireCalled = false;
194
195    // Destroy fence as BufferQueue now takes ownership
196    if (mSlots[slot].mEglFence != EGL_NO_SYNC_KHR) {
197        eglDestroySyncKHR(mSlots[slot].mEglDisplay, mSlots[slot].mEglFence);
198        mSlots[slot].mEglFence = EGL_NO_SYNC_KHR;
199    }
200    mSlots[slot].mFence = Fence::NO_FENCE;
201}
202
203void BufferQueueCore::freeAllBuffersLocked() {
204    mBufferHasBeenQueued = false;
205    for (int s = 0; s < BufferQueueDefs::NUM_BUFFER_SLOTS; ++s) {
206        freeBufferLocked(s);
207    }
208}
209
210bool BufferQueueCore::stillTracking(const BufferItem* item) const {
211    const BufferSlot& slot = mSlots[item->mSlot];
212
213    BQ_LOGV("stillTracking: item { slot=%d/%llu buffer=%p } "
214            "slot { slot=%d/%llu buffer=%p }",
215            item->mSlot, item->mFrameNumber,
216            (item->mGraphicBuffer.get() ? item->mGraphicBuffer->handle : 0),
217            item->mSlot, slot.mFrameNumber,
218            (slot.mGraphicBuffer.get() ? slot.mGraphicBuffer->handle : 0));
219
220    // Compare item with its original buffer slot. We can check the slot as
221    // the buffer would not be moved to a different slot by the producer.
222    return (slot.mGraphicBuffer != NULL) &&
223           (item->mGraphicBuffer->handle == slot.mGraphicBuffer->handle);
224}
225
226} // namespace android
227