BufferQueue.cpp revision ad678e18b66f495efa78dc3b9ab99b579945c9e2 
1/*
2 * Copyright (C) 2012 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 "BufferQueue"
18#define ATRACE_TAG ATRACE_TAG_GRAPHICS
19//#define LOG_NDEBUG 0
20
21#define GL_GLEXT_PROTOTYPES
22#define EGL_EGLEXT_PROTOTYPES
23
24#include <EGL/egl.h>
25#include <EGL/eglext.h>
26
27#include <gui/BufferQueue.h>
28#include <gui/ISurfaceComposer.h>
29#include <private/gui/ComposerService.h>
30
31#include <utils/Log.h>
32#include <utils/Trace.h>
33#include <utils/CallStack.h>
34
35// Macros for including the BufferQueue name in log messages
36#define ST_LOGV(x, ...) ALOGV("[%s] "x, mConsumerName.string(), ##__VA_ARGS__)
37#define ST_LOGD(x, ...) ALOGD("[%s] "x, mConsumerName.string(), ##__VA_ARGS__)
38#define ST_LOGI(x, ...) ALOGI("[%s] "x, mConsumerName.string(), ##__VA_ARGS__)
39#define ST_LOGW(x, ...) ALOGW("[%s] "x, mConsumerName.string(), ##__VA_ARGS__)
40#define ST_LOGE(x, ...) ALOGE("[%s] "x, mConsumerName.string(), ##__VA_ARGS__)
41
42#define ATRACE_BUFFER_INDEX(index)                                            \
43    if (ATRACE_ENABLED()) {                                                   \
44        char ___traceBuf[1024];                                               \
45        snprintf(___traceBuf, 1024, "%s: %d", mConsumerName.string(),         \
46                (index));                                                     \
47        android::ScopedTrace ___bufTracer(ATRACE_TAG, ___traceBuf);           \
48    }
49
50namespace android {
51
52// Get an ID that's unique within this process.
53static int32_t createProcessUniqueId() {
54    static volatile int32_t globalCounter = 0;
55    return android_atomic_inc(&globalCounter);
56}
57
58static const char* scalingModeName(int scalingMode) {
59    switch (scalingMode) {
60        case NATIVE_WINDOW_SCALING_MODE_FREEZE: return "FREEZE";
61        case NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW: return "SCALE_TO_WINDOW";
62        case NATIVE_WINDOW_SCALING_MODE_SCALE_CROP: return "SCALE_CROP";
63        default: return "Unknown";
64    }
65}
66
67BufferQueue::BufferQueue(const sp<IGraphicBufferAlloc>& allocator) :
68    mDefaultWidth(1),
69    mDefaultHeight(1),
70    mMaxAcquiredBufferCount(1),
71    mDefaultMaxBufferCount(2),
72    mOverrideMaxBufferCount(0),
73    mConsumerControlledByApp(false),
74    mDequeueBufferCannotBlock(false),
75    mUseAsyncBuffer(true),
76    mConnectedApi(NO_CONNECTED_API),
77    mAbandoned(false),
78    mFrameCounter(0),
79    mBufferHasBeenQueued(false),
80    mDefaultBufferFormat(PIXEL_FORMAT_RGBA_8888),
81    mConsumerUsageBits(0),
82    mTransformHint(0)
83{
84    // Choose a name using the PID and a process-unique ID.
85    mConsumerName = String8::format("unnamed-%d-%d", getpid(), createProcessUniqueId());
86
87    ST_LOGV("BufferQueue");
88    if (allocator == NULL) {
89        sp<ISurfaceComposer> composer(ComposerService::getComposerService());
90        mGraphicBufferAlloc = composer->createGraphicBufferAlloc();
91        if (mGraphicBufferAlloc == 0) {
92            ST_LOGE("createGraphicBufferAlloc() failed in BufferQueue()");
93        }
94    } else {
95        mGraphicBufferAlloc = allocator;
96    }
97}
98
99BufferQueue::~BufferQueue() {
100    ST_LOGV("~BufferQueue");
101}
102
103status_t BufferQueue::setDefaultMaxBufferCountLocked(int count) {
104    const int minBufferCount = mUseAsyncBuffer ? 2 : 1;
105    if (count < minBufferCount || count > NUM_BUFFER_SLOTS)
106        return BAD_VALUE;
107
108    mDefaultMaxBufferCount = count;
109    mDequeueCondition.broadcast();
110
111    return NO_ERROR;
112}
113
114void BufferQueue::setConsumerName(const String8& name) {
115    Mutex::Autolock lock(mMutex);
116    mConsumerName = name;
117}
118
119status_t BufferQueue::setDefaultBufferFormat(uint32_t defaultFormat) {
120    Mutex::Autolock lock(mMutex);
121    mDefaultBufferFormat = defaultFormat;
122    return NO_ERROR;
123}
124
125status_t BufferQueue::setConsumerUsageBits(uint32_t usage) {
126    Mutex::Autolock lock(mMutex);
127    mConsumerUsageBits = usage;
128    return NO_ERROR;
129}
130
131status_t BufferQueue::setTransformHint(uint32_t hint) {
132    ST_LOGV("setTransformHint: %02x", hint);
133    Mutex::Autolock lock(mMutex);
134    mTransformHint = hint;
135    return NO_ERROR;
136}
137
138status_t BufferQueue::setBufferCount(int bufferCount) {
139    ST_LOGV("setBufferCount: count=%d", bufferCount);
140
141    sp<ConsumerListener> listener;
142    {
143        Mutex::Autolock lock(mMutex);
144
145        if (mAbandoned) {
146            ST_LOGE("setBufferCount: BufferQueue has been abandoned!");
147            return NO_INIT;
148        }
149        if (bufferCount > NUM_BUFFER_SLOTS) {
150            ST_LOGE("setBufferCount: bufferCount too large (max %d)",
151                    NUM_BUFFER_SLOTS);
152            return BAD_VALUE;
153        }
154
155        // Error out if the user has dequeued buffers
156        for (int i=0 ; i<NUM_BUFFER_SLOTS; i++) {
157            if (mSlots[i].mBufferState == BufferSlot::DEQUEUED) {
158                ST_LOGE("setBufferCount: client owns some buffers");
159                return -EINVAL;
160            }
161        }
162
163        if (bufferCount == 0) {
164            mOverrideMaxBufferCount = 0;
165            mDequeueCondition.broadcast();
166            return NO_ERROR;
167        }
168
169        // fine to assume async to false before we're setting the buffer count
170        const int minBufferSlots = getMinMaxBufferCountLocked(false);
171        if (bufferCount < minBufferSlots) {
172            ST_LOGE("setBufferCount: requested buffer count (%d) is less than "
173                    "minimum (%d)", bufferCount, minBufferSlots);
174            return BAD_VALUE;
175        }
176
177        // here we're guaranteed that the client doesn't have dequeued buffers
178        // and will release all of its buffer references.  We don't clear the
179        // queue, however, so currently queued buffers still get displayed.
180        freeAllBuffersLocked();
181        mOverrideMaxBufferCount = bufferCount;
182        mDequeueCondition.broadcast();
183        listener = mConsumerListener;
184    } // scope for lock
185
186    if (listener != NULL) {
187        listener->onBuffersReleased();
188    }
189
190    return NO_ERROR;
191}
192
193int BufferQueue::query(int what, int* outValue)
194{
195    ATRACE_CALL();
196    Mutex::Autolock lock(mMutex);
197
198    if (mAbandoned) {
199        ST_LOGE("query: BufferQueue has been abandoned!");
200        return NO_INIT;
201    }
202
203    int value;
204    switch (what) {
205    case NATIVE_WINDOW_WIDTH:
206        value = mDefaultWidth;
207        break;
208    case NATIVE_WINDOW_HEIGHT:
209        value = mDefaultHeight;
210        break;
211    case NATIVE_WINDOW_FORMAT:
212        value = mDefaultBufferFormat;
213        break;
214    case NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS:
215        value = getMinUndequeuedBufferCount(false);
216        break;
217    case NATIVE_WINDOW_CONSUMER_RUNNING_BEHIND:
218        value = (mQueue.size() >= 2);
219        break;
220    default:
221        return BAD_VALUE;
222    }
223    outValue[0] = value;
224    return NO_ERROR;
225}
226
227status_t BufferQueue::requestBuffer(int slot, sp<GraphicBuffer>* buf) {
228    ATRACE_CALL();
229    ST_LOGV("requestBuffer: slot=%d", slot);
230    Mutex::Autolock lock(mMutex);
231    if (mAbandoned) {
232        ST_LOGE("requestBuffer: BufferQueue has been abandoned!");
233        return NO_INIT;
234    }
235    if (slot < 0 || slot >= NUM_BUFFER_SLOTS) {
236        ST_LOGE("requestBuffer: slot index out of range [0, %d]: %d",
237                NUM_BUFFER_SLOTS, slot);
238        return BAD_VALUE;
239    } else if (mSlots[slot].mBufferState != BufferSlot::DEQUEUED) {
240        ST_LOGE("requestBuffer: slot %d is not owned by the client (state=%d)",
241                slot, mSlots[slot].mBufferState);
242        return BAD_VALUE;
243    }
244    mSlots[slot].mRequestBufferCalled = true;
245    *buf = mSlots[slot].mGraphicBuffer;
246    return NO_ERROR;
247}
248
249status_t BufferQueue::dequeueBuffer(int *outBuf, sp<Fence>* outFence, bool async,
250        uint32_t w, uint32_t h, uint32_t format, uint32_t usage) {
251    ATRACE_CALL();
252    ST_LOGV("dequeueBuffer: w=%d h=%d fmt=%#x usage=%#x", w, h, format, usage);
253
254    if ((w && !h) || (!w && h)) {
255        ST_LOGE("dequeueBuffer: invalid size: w=%u, h=%u", w, h);
256        return BAD_VALUE;
257    }
258
259    status_t returnFlags(OK);
260    EGLDisplay dpy = EGL_NO_DISPLAY;
261    EGLSyncKHR eglFence = EGL_NO_SYNC_KHR;
262
263    { // Scope for the lock
264        Mutex::Autolock lock(mMutex);
265
266        if (format == 0) {
267            format = mDefaultBufferFormat;
268        }
269        // turn on usage bits the consumer requested
270        usage |= mConsumerUsageBits;
271
272        int found = -1;
273        bool tryAgain = true;
274        while (tryAgain) {
275            if (mAbandoned) {
276                ST_LOGE("dequeueBuffer: BufferQueue has been abandoned!");
277                return NO_INIT;
278            }
279
280            const int maxBufferCount = getMaxBufferCountLocked(async);
281            if (async && mOverrideMaxBufferCount) {
282                // FIXME: some drivers are manually setting the buffer-count (which they
283                // shouldn't), so we do this extra test here to handle that case.
284                // This is TEMPORARY, until we get this fixed.
285                if (mOverrideMaxBufferCount < maxBufferCount) {
286                    ST_LOGE("dequeueBuffer: async mode is invalid with buffercount override");
287                    return BAD_VALUE;
288                }
289            }
290
291            // Free up any buffers that are in slots beyond the max buffer
292            // count.
293            for (int i = maxBufferCount; i < NUM_BUFFER_SLOTS; i++) {
294                assert(mSlots[i].mBufferState == BufferSlot::FREE);
295                if (mSlots[i].mGraphicBuffer != NULL) {
296                    freeBufferLocked(i);
297                    returnFlags |= IGraphicBufferProducer::RELEASE_ALL_BUFFERS;
298                }
299            }
300
301            // look for a free buffer to give to the client
302            found = INVALID_BUFFER_SLOT;
303            int dequeuedCount = 0;
304            int acquiredCount = 0;
305            for (int i = 0; i < maxBufferCount; i++) {
306                const int state = mSlots[i].mBufferState;
307                switch (state) {
308                    case BufferSlot::DEQUEUED:
309                        dequeuedCount++;
310                        break;
311                    case BufferSlot::ACQUIRED:
312                        acquiredCount++;
313                        break;
314                    case BufferSlot::FREE:
315                        /* We return the oldest of the free buffers to avoid
316                         * stalling the producer if possible.  This is because
317                         * the consumer may still have pending reads of the
318                         * buffers in flight.
319                         */
320                        if ((found < 0) ||
321                                mSlots[i].mFrameNumber < mSlots[found].mFrameNumber) {
322                            found = i;
323                        }
324                        break;
325                }
326            }
327
328            // clients are not allowed to dequeue more than one buffer
329            // if they didn't set a buffer count.
330            if (!mOverrideMaxBufferCount && dequeuedCount) {
331                ST_LOGE("dequeueBuffer: can't dequeue multiple buffers without "
332                        "setting the buffer count");
333                return -EINVAL;
334            }
335
336            // See whether a buffer has been queued since the last
337            // setBufferCount so we know whether to perform the min undequeued
338            // buffers check below.
339            if (mBufferHasBeenQueued) {
340                // make sure the client is not trying to dequeue more buffers
341                // than allowed.
342                const int newUndequeuedCount = maxBufferCount - (dequeuedCount+1);
343                const int minUndequeuedCount = getMinUndequeuedBufferCount(async);
344                if (newUndequeuedCount < minUndequeuedCount) {
345                    ST_LOGE("dequeueBuffer: min undequeued buffer count (%d) "
346                            "exceeded (dequeued=%d undequeudCount=%d)",
347                            minUndequeuedCount, dequeuedCount,
348                            newUndequeuedCount);
349                    return -EBUSY;
350                }
351            }
352
353            // If no buffer is found, wait for a buffer to be released or for
354            // the max buffer count to change.
355            tryAgain = found == INVALID_BUFFER_SLOT;
356            if (tryAgain) {
357                // return an error if we're in "cannot block" mode (producer and consumer
358                // are controlled by the application) -- however, the consumer is allowed
359                // to acquire briefly an extra buffer (which could cause us to have to wait here)
360                // and that's okay because we know the wait will be brief (it happens
361                // if we dequeue a buffer while the consumer has acquired one but not released
362                // the old one yet -- for e.g.: see GLConsumer::updateTexImage()).
363                if (mDequeueBufferCannotBlock && (acquiredCount <= mMaxAcquiredBufferCount)) {
364                    ST_LOGE("dequeueBuffer: would block! returning an error instead.");
365                    return WOULD_BLOCK;
366                }
367                mDequeueCondition.wait(mMutex);
368            }
369        }
370
371
372        if (found == INVALID_BUFFER_SLOT) {
373            // This should not happen.
374            ST_LOGE("dequeueBuffer: no available buffer slots");
375            return -EBUSY;
376        }
377
378        const int buf = found;
379        *outBuf = found;
380
381        ATRACE_BUFFER_INDEX(buf);
382
383        const bool useDefaultSize = !w && !h;
384        if (useDefaultSize) {
385            // use the default size
386            w = mDefaultWidth;
387            h = mDefaultHeight;
388        }
389
390        mSlots[buf].mBufferState = BufferSlot::DEQUEUED;
391
392        const sp<GraphicBuffer>& buffer(mSlots[buf].mGraphicBuffer);
393        if ((buffer == NULL) ||
394            (uint32_t(buffer->width)  != w) ||
395            (uint32_t(buffer->height) != h) ||
396            (uint32_t(buffer->format) != format) ||
397            ((uint32_t(buffer->usage) & usage) != usage))
398        {
399            mSlots[buf].mAcquireCalled = false;
400            mSlots[buf].mGraphicBuffer = NULL;
401            mSlots[buf].mRequestBufferCalled = false;
402            mSlots[buf].mEglFence = EGL_NO_SYNC_KHR;
403            mSlots[buf].mFence = Fence::NO_FENCE;
404            mSlots[buf].mEglDisplay = EGL_NO_DISPLAY;
405
406            returnFlags |= IGraphicBufferProducer::BUFFER_NEEDS_REALLOCATION;
407        }
408
409        dpy = mSlots[buf].mEglDisplay;
410        eglFence = mSlots[buf].mEglFence;
411        *outFence = mSlots[buf].mFence;
412        mSlots[buf].mEglFence = EGL_NO_SYNC_KHR;
413        mSlots[buf].mFence = Fence::NO_FENCE;
414    }  // end lock scope
415
416    if (returnFlags & IGraphicBufferProducer::BUFFER_NEEDS_REALLOCATION) {
417        status_t error;
418        sp<GraphicBuffer> graphicBuffer(
419                mGraphicBufferAlloc->createGraphicBuffer(
420                        w, h, format, usage, &error));
421        if (graphicBuffer == 0) {
422            ST_LOGE("dequeueBuffer: SurfaceComposer::createGraphicBuffer "
423                    "failed");
424            return error;
425        }
426
427        { // Scope for the lock
428            Mutex::Autolock lock(mMutex);
429
430            if (mAbandoned) {
431                ST_LOGE("dequeueBuffer: BufferQueue has been abandoned!");
432                return NO_INIT;
433            }
434
435            mSlots[*outBuf].mFrameNumber = ~0;
436            mSlots[*outBuf].mGraphicBuffer = graphicBuffer;
437        }
438    }
439
440    if (eglFence != EGL_NO_SYNC_KHR) {
441        EGLint result = eglClientWaitSyncKHR(dpy, eglFence, 0, 1000000000);
442        // If something goes wrong, log the error, but return the buffer without
443        // synchronizing access to it.  It's too late at this point to abort the
444        // dequeue operation.
445        if (result == EGL_FALSE) {
446            ST_LOGE("dequeueBuffer: error waiting for fence: %#x", eglGetError());
447        } else if (result == EGL_TIMEOUT_EXPIRED_KHR) {
448            ST_LOGE("dequeueBuffer: timeout waiting for fence");
449        }
450        eglDestroySyncKHR(dpy, eglFence);
451    }
452
453    ST_LOGV("dequeueBuffer: returning slot=%d/%llu buf=%p flags=%#x", *outBuf,
454            mSlots[*outBuf].mFrameNumber,
455            mSlots[*outBuf].mGraphicBuffer->handle, returnFlags);
456
457    return returnFlags;
458}
459
460status_t BufferQueue::queueBuffer(int buf,
461        const QueueBufferInput& input, QueueBufferOutput* output) {
462    ATRACE_CALL();
463    ATRACE_BUFFER_INDEX(buf);
464
465    Rect crop;
466    uint32_t transform;
467    int scalingMode;
468    int64_t timestamp;
469    bool async;
470    sp<Fence> fence;
471
472    input.deflate(&timestamp, &crop, &scalingMode, &transform, &async, &fence);
473
474    if (fence == NULL) {
475        ST_LOGE("queueBuffer: fence is NULL");
476        return BAD_VALUE;
477    }
478
479    switch (scalingMode) {
480        case NATIVE_WINDOW_SCALING_MODE_FREEZE:
481        case NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW:
482        case NATIVE_WINDOW_SCALING_MODE_SCALE_CROP:
483        case NATIVE_WINDOW_SCALING_MODE_NO_SCALE_CROP:
484            break;
485        default:
486            ST_LOGE("unknown scaling mode: %d", scalingMode);
487            return -EINVAL;
488    }
489
490    sp<ConsumerListener> listener;
491
492    { // scope for the lock
493        Mutex::Autolock lock(mMutex);
494
495        if (mAbandoned) {
496            ST_LOGE("queueBuffer: BufferQueue has been abandoned!");
497            return NO_INIT;
498        }
499
500        const int maxBufferCount = getMaxBufferCountLocked(async);
501        if (async && mOverrideMaxBufferCount) {
502            // FIXME: some drivers are manually setting the buffer-count (which they
503            // shouldn't), so we do this extra test here to handle that case.
504            // This is TEMPORARY, until we get this fixed.
505            if (mOverrideMaxBufferCount < maxBufferCount) {
506                ST_LOGE("queueBuffer: async mode is invalid with buffercount override");
507                return BAD_VALUE;
508            }
509        }
510        if (buf < 0 || buf >= maxBufferCount) {
511            ST_LOGE("queueBuffer: slot index out of range [0, %d]: %d",
512                    maxBufferCount, buf);
513            return -EINVAL;
514        } else if (mSlots[buf].mBufferState != BufferSlot::DEQUEUED) {
515            ST_LOGE("queueBuffer: slot %d is not owned by the client "
516                    "(state=%d)", buf, mSlots[buf].mBufferState);
517            return -EINVAL;
518        } else if (!mSlots[buf].mRequestBufferCalled) {
519            ST_LOGE("queueBuffer: slot %d was enqueued without requesting a "
520                    "buffer", buf);
521            return -EINVAL;
522        }
523
524        ST_LOGV("queueBuffer: slot=%d/%llu time=%#llx crop=[%d,%d,%d,%d] "
525                "tr=%#x scale=%s",
526                buf, mFrameCounter + 1, timestamp,
527                crop.left, crop.top, crop.right, crop.bottom,
528                transform, scalingModeName(scalingMode));
529
530        const sp<GraphicBuffer>& graphicBuffer(mSlots[buf].mGraphicBuffer);
531        Rect bufferRect(graphicBuffer->getWidth(), graphicBuffer->getHeight());
532        Rect croppedCrop;
533        crop.intersect(bufferRect, &croppedCrop);
534        if (croppedCrop != crop) {
535            ST_LOGE("queueBuffer: crop rect is not contained within the "
536                    "buffer in slot %d", buf);
537            return -EINVAL;
538        }
539
540        mSlots[buf].mFence = fence;
541        mSlots[buf].mBufferState = BufferSlot::QUEUED;
542        mFrameCounter++;
543        mSlots[buf].mFrameNumber = mFrameCounter;
544
545        BufferItem item;
546        item.mAcquireCalled = mSlots[buf].mAcquireCalled;
547        item.mGraphicBuffer = mSlots[buf].mGraphicBuffer;
548        item.mCrop = crop;
549        item.mTransform = transform;
550        item.mScalingMode = scalingMode;
551        item.mTimestamp = timestamp;
552        item.mFrameNumber = mFrameCounter;
553        item.mBuf = buf;
554        item.mFence = fence;
555        item.mIsDroppable = mDequeueBufferCannotBlock || async;
556
557        if (mQueue.empty()) {
558            // when the queue is empty, we can ignore "mDequeueBufferCannotBlock", and
559            // simply queue this buffer.
560            mQueue.push_back(item);
561            listener = mConsumerListener;
562        } else {
563            // when the queue is not empty, we need to look at the front buffer
564            // state and see if we need to replace it.
565            Fifo::iterator front(mQueue.begin());
566            if (front->mIsDroppable) {
567                // buffer slot currently queued is marked free if still tracked
568                if (stillTracking(front)) {
569                    mSlots[front->mBuf].mBufferState = BufferSlot::FREE;
570                    // reset the frame number of the freed buffer so that it is the first in
571                    // line to be dequeued again.
572                    mSlots[front->mBuf].mFrameNumber = 0;
573                }
574                // and we record the new buffer in the queued list
575                *front = item;
576            } else {
577                mQueue.push_back(item);
578                listener = mConsumerListener;
579            }
580        }
581
582        mBufferHasBeenQueued = true;
583        mDequeueCondition.broadcast();
584
585        output->inflate(mDefaultWidth, mDefaultHeight, mTransformHint,
586                mQueue.size());
587
588        ATRACE_INT(mConsumerName.string(), mQueue.size());
589    } // scope for the lock
590
591    // call back without lock held
592    if (listener != 0) {
593        listener->onFrameAvailable();
594    }
595    return NO_ERROR;
596}
597
598void BufferQueue::cancelBuffer(int buf, const sp<Fence>& fence) {
599    ATRACE_CALL();
600    ST_LOGV("cancelBuffer: slot=%d", buf);
601    Mutex::Autolock lock(mMutex);
602
603    if (mAbandoned) {
604        ST_LOGW("cancelBuffer: BufferQueue has been abandoned!");
605        return;
606    }
607
608    if (buf < 0 || buf >= NUM_BUFFER_SLOTS) {
609        ST_LOGE("cancelBuffer: slot index out of range [0, %d]: %d",
610                NUM_BUFFER_SLOTS, buf);
611        return;
612    } else if (mSlots[buf].mBufferState != BufferSlot::DEQUEUED) {
613        ST_LOGE("cancelBuffer: slot %d is not owned by the client (state=%d)",
614                buf, mSlots[buf].mBufferState);
615        return;
616    } else if (fence == NULL) {
617        ST_LOGE("cancelBuffer: fence is NULL");
618        return;
619    }
620    mSlots[buf].mBufferState = BufferSlot::FREE;
621    mSlots[buf].mFrameNumber = 0;
622    mSlots[buf].mFence = fence;
623    mDequeueCondition.broadcast();
624}
625
626status_t BufferQueue::connect(int api, bool producerControlledByApp, QueueBufferOutput* output) {
627    ATRACE_CALL();
628    ST_LOGV("connect: api=%d", api);
629    Mutex::Autolock lock(mMutex);
630
631    if (mAbandoned) {
632        ST_LOGE("connect: BufferQueue has been abandoned!");
633        return NO_INIT;
634    }
635
636    if (mConsumerListener == NULL) {
637        ST_LOGE("connect: BufferQueue has no consumer!");
638        return NO_INIT;
639    }
640
641    int err = NO_ERROR;
642    switch (api) {
643        case NATIVE_WINDOW_API_EGL:
644        case NATIVE_WINDOW_API_CPU:
645        case NATIVE_WINDOW_API_MEDIA:
646        case NATIVE_WINDOW_API_CAMERA:
647            if (mConnectedApi != NO_CONNECTED_API) {
648                ST_LOGE("connect: already connected (cur=%d, req=%d)",
649                        mConnectedApi, api);
650                err = -EINVAL;
651            } else {
652                mConnectedApi = api;
653                output->inflate(mDefaultWidth, mDefaultHeight, mTransformHint,
654                        mQueue.size());
655            }
656            break;
657        default:
658            err = -EINVAL;
659            break;
660    }
661
662    mBufferHasBeenQueued = false;
663    mDequeueBufferCannotBlock = mConsumerControlledByApp && producerControlledByApp;
664
665    return err;
666}
667
668status_t BufferQueue::disconnect(int api) {
669    ATRACE_CALL();
670    ST_LOGV("disconnect: api=%d", api);
671
672    int err = NO_ERROR;
673    sp<ConsumerListener> listener;
674
675    { // Scope for the lock
676        Mutex::Autolock lock(mMutex);
677
678        if (mAbandoned) {
679            // it is not really an error to disconnect after the surface
680            // has been abandoned, it should just be a no-op.
681            return NO_ERROR;
682        }
683
684        switch (api) {
685            case NATIVE_WINDOW_API_EGL:
686            case NATIVE_WINDOW_API_CPU:
687            case NATIVE_WINDOW_API_MEDIA:
688            case NATIVE_WINDOW_API_CAMERA:
689                if (mConnectedApi == api) {
690                    freeAllBuffersLocked();
691                    mConnectedApi = NO_CONNECTED_API;
692                    mDequeueCondition.broadcast();
693                    listener = mConsumerListener;
694                } else {
695                    ST_LOGE("disconnect: connected to another api (cur=%d, req=%d)",
696                            mConnectedApi, api);
697                    err = -EINVAL;
698                }
699                break;
700            default:
701                ST_LOGE("disconnect: unknown API %d", api);
702                err = -EINVAL;
703                break;
704        }
705    }
706
707    if (listener != NULL) {
708        listener->onBuffersReleased();
709    }
710
711    return err;
712}
713
714void BufferQueue::dump(String8& result) const {
715    BufferQueue::dump(result, "");
716}
717
718void BufferQueue::dump(String8& result, const char* prefix) const {
719    Mutex::Autolock _l(mMutex);
720
721    String8 fifo;
722    int fifoSize = 0;
723    Fifo::const_iterator i(mQueue.begin());
724    while (i != mQueue.end()) {
725        fifo.appendFormat("%02d:%p crop=[%d,%d,%d,%d], "
726                "xform=0x%02x, time=%#llx, scale=%s\n",
727                i->mBuf, i->mGraphicBuffer.get(),
728                i->mCrop.left, i->mCrop.top, i->mCrop.right,
729                i->mCrop.bottom, i->mTransform, i->mTimestamp,
730                scalingModeName(i->mScalingMode)
731                );
732        i++;
733        fifoSize++;
734    }
735
736
737    result.appendFormat(
738            "%s-BufferQueue mMaxAcquiredBufferCount=%d, mDequeueBufferCannotBlock=%d, default-size=[%dx%d], "
739            "default-format=%d, transform-hint=%02x, FIFO(%d)={%s}\n",
740            prefix, mMaxAcquiredBufferCount, mDequeueBufferCannotBlock, mDefaultWidth,
741            mDefaultHeight, mDefaultBufferFormat, mTransformHint,
742            fifoSize, fifo.string());
743
744    struct {
745        const char * operator()(int state) const {
746            switch (state) {
747                case BufferSlot::DEQUEUED: return "DEQUEUED";
748                case BufferSlot::QUEUED: return "QUEUED";
749                case BufferSlot::FREE: return "FREE";
750                case BufferSlot::ACQUIRED: return "ACQUIRED";
751                default: return "Unknown";
752            }
753        }
754    } stateName;
755
756    // just trim the free buffers to not spam the dump
757    int maxBufferCount = 0;
758    for (int i=NUM_BUFFER_SLOTS-1 ; i>=0 ; i--) {
759        const BufferSlot& slot(mSlots[i]);
760        if ((slot.mBufferState != BufferSlot::FREE) || (slot.mGraphicBuffer != NULL)) {
761            maxBufferCount = i+1;
762            break;
763        }
764    }
765
766    for (int i=0 ; i<maxBufferCount ; i++) {
767        const BufferSlot& slot(mSlots[i]);
768        const sp<GraphicBuffer>& buf(slot.mGraphicBuffer);
769        result.appendFormat(
770            "%s%s[%02d:%p] state=%-8s",
771                prefix, (slot.mBufferState == BufferSlot::ACQUIRED)?">":" ", i, buf.get(),
772                stateName(slot.mBufferState)
773        );
774
775        if (buf != NULL) {
776            result.appendFormat(
777                    ", %p [%4ux%4u:%4u,%3X]",
778                    buf->handle, buf->width, buf->height, buf->stride,
779                    buf->format);
780        }
781        result.append("\n");
782    }
783}
784
785void BufferQueue::freeBufferLocked(int slot) {
786    ST_LOGV("freeBufferLocked: slot=%d", slot);
787    mSlots[slot].mGraphicBuffer = 0;
788    if (mSlots[slot].mBufferState == BufferSlot::ACQUIRED) {
789        mSlots[slot].mNeedsCleanupOnRelease = true;
790    }
791    mSlots[slot].mBufferState = BufferSlot::FREE;
792    mSlots[slot].mFrameNumber = 0;
793    mSlots[slot].mAcquireCalled = false;
794
795    // destroy fence as BufferQueue now takes ownership
796    if (mSlots[slot].mEglFence != EGL_NO_SYNC_KHR) {
797        eglDestroySyncKHR(mSlots[slot].mEglDisplay, mSlots[slot].mEglFence);
798        mSlots[slot].mEglFence = EGL_NO_SYNC_KHR;
799    }
800    mSlots[slot].mFence = Fence::NO_FENCE;
801}
802
803void BufferQueue::freeAllBuffersLocked() {
804    mBufferHasBeenQueued = false;
805    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
806        freeBufferLocked(i);
807    }
808}
809
810status_t BufferQueue::acquireBuffer(BufferItem *buffer, nsecs_t presentWhen) {
811    ATRACE_CALL();
812    Mutex::Autolock _l(mMutex);
813
814    // Check that the consumer doesn't currently have the maximum number of
815    // buffers acquired.  We allow the max buffer count to be exceeded by one
816    // buffer, so that the consumer can successfully set up the newly acquired
817    // buffer before releasing the old one.
818    int numAcquiredBuffers = 0;
819    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
820        if (mSlots[i].mBufferState == BufferSlot::ACQUIRED) {
821            numAcquiredBuffers++;
822        }
823    }
824    if (numAcquiredBuffers >= mMaxAcquiredBufferCount+1) {
825        ST_LOGE("acquireBuffer: max acquired buffer count reached: %d (max=%d)",
826                numAcquiredBuffers, mMaxAcquiredBufferCount);
827        return INVALID_OPERATION;
828    }
829
830    // check if queue is empty
831    // In asynchronous mode the list is guaranteed to be one buffer
832    // deep, while in synchronous mode we use the oldest buffer.
833    if (mQueue.empty()) {
834        return NO_BUFFER_AVAILABLE;
835    }
836
837    Fifo::iterator front(mQueue.begin());
838    int buf = front->mBuf;
839
840    // Compare the buffer's desired presentation time to the predicted
841    // actual display time.
842    //
843    // The "presentWhen" argument indicates when the buffer is expected
844    // to be presented on-screen.  If the buffer's desired-present time
845    // is earlier (less) than presentWhen, meaning it'll be displayed
846    // on time or possibly late, we acquire and return it.  If we don't want
847    // to display it until after the presentWhen time, we return PRESENT_LATER
848    // without acquiring it.
849    //
850    // To be safe, we don't refuse to acquire the buffer if presentWhen is
851    // more than one second in the future beyond the desired present time
852    // (i.e. we'd be holding the buffer for a really long time).
853    const int MAX_FUTURE_NSEC = 1000000000ULL;
854    nsecs_t desiredPresent = front->mTimestamp;
855    if (presentWhen != 0 && desiredPresent > presentWhen &&
856            desiredPresent - presentWhen < MAX_FUTURE_NSEC)
857    {
858        ST_LOGV("pts defer: des=%lld when=%lld (%lld) now=%lld",
859                desiredPresent, presentWhen, desiredPresent - presentWhen,
860                systemTime(CLOCK_MONOTONIC));
861        return PRESENT_LATER;
862    }
863    if (presentWhen != 0) {
864        ST_LOGV("pts accept: %p[%d] sig=%lld des=%lld when=%lld (%lld)",
865                mSlots, buf, mSlots[buf].mFence->getSignalTime(),
866                desiredPresent, presentWhen, desiredPresent - presentWhen);
867    }
868
869    *buffer = *front;
870    ATRACE_BUFFER_INDEX(buf);
871
872    ST_LOGV("acquireBuffer: acquiring { slot=%d/%llu, buffer=%p }",
873            front->mBuf, front->mFrameNumber,
874            front->mGraphicBuffer->handle);
875    // if front buffer still being tracked update slot state
876    if (stillTracking(front)) {
877        mSlots[buf].mAcquireCalled = true;
878        mSlots[buf].mNeedsCleanupOnRelease = false;
879        mSlots[buf].mBufferState = BufferSlot::ACQUIRED;
880        mSlots[buf].mFence = Fence::NO_FENCE;
881    }
882
883    // If the buffer has previously been acquired by the consumer, set
884    // mGraphicBuffer to NULL to avoid unnecessarily remapping this
885    // buffer on the consumer side.
886    if (buffer->mAcquireCalled) {
887        buffer->mGraphicBuffer = NULL;
888    }
889
890    mQueue.erase(front);
891    mDequeueCondition.broadcast();
892
893    ATRACE_INT(mConsumerName.string(), mQueue.size());
894
895    return NO_ERROR;
896}
897
898status_t BufferQueue::releaseBuffer(
899        int buf, uint64_t frameNumber, EGLDisplay display,
900        EGLSyncKHR eglFence, const sp<Fence>& fence) {
901    ATRACE_CALL();
902    ATRACE_BUFFER_INDEX(buf);
903
904    if (buf == INVALID_BUFFER_SLOT || fence == NULL) {
905        return BAD_VALUE;
906    }
907
908    Mutex::Autolock _l(mMutex);
909
910    // If the frame number has changed because buffer has been reallocated,
911    // we can ignore this releaseBuffer for the old buffer.
912    if (frameNumber != mSlots[buf].mFrameNumber) {
913        return STALE_BUFFER_SLOT;
914    }
915
916
917    // Internal state consistency checks:
918    // Make sure this buffers hasn't been queued while we were owning it (acquired)
919    Fifo::iterator front(mQueue.begin());
920    Fifo::const_iterator const end(mQueue.end());
921    while (front != end) {
922        if (front->mBuf == buf) {
923            LOG_ALWAYS_FATAL("[%s] received new buffer(#%lld) on slot #%d that has not yet been "
924                    "acquired", mConsumerName.string(), frameNumber, buf);
925            break; // never reached
926        }
927        front++;
928    }
929
930    // The buffer can now only be released if its in the acquired state
931    if (mSlots[buf].mBufferState == BufferSlot::ACQUIRED) {
932        mSlots[buf].mEglDisplay = display;
933        mSlots[buf].mEglFence = eglFence;
934        mSlots[buf].mFence = fence;
935        mSlots[buf].mBufferState = BufferSlot::FREE;
936    } else if (mSlots[buf].mNeedsCleanupOnRelease) {
937        ST_LOGV("releasing a stale buf %d its state was %d", buf, mSlots[buf].mBufferState);
938        mSlots[buf].mNeedsCleanupOnRelease = false;
939        return STALE_BUFFER_SLOT;
940    } else {
941        ST_LOGE("attempted to release buf %d but its state was %d", buf, mSlots[buf].mBufferState);
942        return -EINVAL;
943    }
944
945    mDequeueCondition.broadcast();
946    return NO_ERROR;
947}
948
949status_t BufferQueue::consumerConnect(const sp<ConsumerListener>& consumerListener,
950        bool controlledByApp) {
951    ST_LOGV("consumerConnect");
952    Mutex::Autolock lock(mMutex);
953
954    if (mAbandoned) {
955        ST_LOGE("consumerConnect: BufferQueue has been abandoned!");
956        return NO_INIT;
957    }
958    if (consumerListener == NULL) {
959        ST_LOGE("consumerConnect: consumerListener may not be NULL");
960        return BAD_VALUE;
961    }
962
963    mConsumerListener = consumerListener;
964    mConsumerControlledByApp = controlledByApp;
965
966    return NO_ERROR;
967}
968
969status_t BufferQueue::consumerDisconnect() {
970    ST_LOGV("consumerDisconnect");
971    Mutex::Autolock lock(mMutex);
972
973    if (mConsumerListener == NULL) {
974        ST_LOGE("consumerDisconnect: No consumer is connected!");
975        return -EINVAL;
976    }
977
978    mAbandoned = true;
979    mConsumerListener = NULL;
980    mQueue.clear();
981    freeAllBuffersLocked();
982    mDequeueCondition.broadcast();
983    return NO_ERROR;
984}
985
986status_t BufferQueue::getReleasedBuffers(uint32_t* slotMask) {
987    ST_LOGV("getReleasedBuffers");
988    Mutex::Autolock lock(mMutex);
989
990    if (mAbandoned) {
991        ST_LOGE("getReleasedBuffers: BufferQueue has been abandoned!");
992        return NO_INIT;
993    }
994
995    uint32_t mask = 0;
996    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
997        if (!mSlots[i].mAcquireCalled) {
998            mask |= 1 << i;
999        }
1000    }
1001
1002    // Remove buffers in flight (on the queue) from the mask where acquire has
1003    // been called, as the consumer will not receive the buffer address, so
1004    // it should not free these slots.
1005    Fifo::iterator front(mQueue.begin());
1006    while (front != mQueue.end()) {
1007        if (front->mAcquireCalled)
1008            mask &= ~(1 << front->mBuf);
1009        front++;
1010    }
1011
1012    *slotMask = mask;
1013
1014    ST_LOGV("getReleasedBuffers: returning mask %#x", mask);
1015    return NO_ERROR;
1016}
1017
1018status_t BufferQueue::setDefaultBufferSize(uint32_t w, uint32_t h) {
1019    ST_LOGV("setDefaultBufferSize: w=%d, h=%d", w, h);
1020    if (!w || !h) {
1021        ST_LOGE("setDefaultBufferSize: dimensions cannot be 0 (w=%d, h=%d)",
1022                w, h);
1023        return BAD_VALUE;
1024    }
1025
1026    Mutex::Autolock lock(mMutex);
1027    mDefaultWidth = w;
1028    mDefaultHeight = h;
1029    return NO_ERROR;
1030}
1031
1032status_t BufferQueue::setDefaultMaxBufferCount(int bufferCount) {
1033    ATRACE_CALL();
1034    Mutex::Autolock lock(mMutex);
1035    return setDefaultMaxBufferCountLocked(bufferCount);
1036}
1037
1038status_t BufferQueue::disableAsyncBuffer() {
1039    ATRACE_CALL();
1040    Mutex::Autolock lock(mMutex);
1041    if (mConsumerListener != NULL) {
1042        ST_LOGE("disableAsyncBuffer: consumer already connected!");
1043        return INVALID_OPERATION;
1044    }
1045    mUseAsyncBuffer = false;
1046    return NO_ERROR;
1047}
1048
1049status_t BufferQueue::setMaxAcquiredBufferCount(int maxAcquiredBuffers) {
1050    ATRACE_CALL();
1051    Mutex::Autolock lock(mMutex);
1052    if (maxAcquiredBuffers < 1 || maxAcquiredBuffers > MAX_MAX_ACQUIRED_BUFFERS) {
1053        ST_LOGE("setMaxAcquiredBufferCount: invalid count specified: %d",
1054                maxAcquiredBuffers);
1055        return BAD_VALUE;
1056    }
1057    if (mConnectedApi != NO_CONNECTED_API) {
1058        return INVALID_OPERATION;
1059    }
1060    mMaxAcquiredBufferCount = maxAcquiredBuffers;
1061    return NO_ERROR;
1062}
1063
1064int BufferQueue::getMinUndequeuedBufferCount(bool async) const {
1065    // if dequeueBuffer is allowed to error out, we don't have to
1066    // add an extra buffer.
1067    if (!mUseAsyncBuffer)
1068        return mMaxAcquiredBufferCount;
1069
1070    // we're in async mode, or we want to prevent the app to
1071    // deadlock itself, we throw-in an extra buffer to guarantee it.
1072    if (mDequeueBufferCannotBlock || async)
1073        return mMaxAcquiredBufferCount+1;
1074
1075    return mMaxAcquiredBufferCount;
1076}
1077
1078int BufferQueue::getMinMaxBufferCountLocked(bool async) const {
1079    return getMinUndequeuedBufferCount(async) + 1;
1080}
1081
1082int BufferQueue::getMaxBufferCountLocked(bool async) const {
1083    int minMaxBufferCount = getMinMaxBufferCountLocked(async);
1084
1085    int maxBufferCount = mDefaultMaxBufferCount;
1086    if (maxBufferCount < minMaxBufferCount) {
1087        maxBufferCount = minMaxBufferCount;
1088    }
1089    if (mOverrideMaxBufferCount != 0) {
1090        assert(mOverrideMaxBufferCount >= minMaxBufferCount);
1091        maxBufferCount = mOverrideMaxBufferCount;
1092    }
1093
1094    // Any buffers that are dequeued by the producer or sitting in the queue
1095    // waiting to be consumed need to have their slots preserved.  Such
1096    // buffers will temporarily keep the max buffer count up until the slots
1097    // no longer need to be preserved.
1098    for (int i = maxBufferCount; i < NUM_BUFFER_SLOTS; i++) {
1099        BufferSlot::BufferState state = mSlots[i].mBufferState;
1100        if (state == BufferSlot::QUEUED || state == BufferSlot::DEQUEUED) {
1101            maxBufferCount = i + 1;
1102        }
1103    }
1104
1105    return maxBufferCount;
1106}
1107
1108bool BufferQueue::stillTracking(const BufferItem *item) const {
1109    const BufferSlot &slot = mSlots[item->mBuf];
1110
1111    ST_LOGV("stillTracking?: item: { slot=%d/%llu, buffer=%p }, "
1112            "slot: { slot=%d/%llu, buffer=%p }",
1113            item->mBuf, item->mFrameNumber,
1114            (item->mGraphicBuffer.get() ? item->mGraphicBuffer->handle : 0),
1115            item->mBuf, slot.mFrameNumber,
1116            (slot.mGraphicBuffer.get() ? slot.mGraphicBuffer->handle : 0));
1117
1118    // Compare item with its original buffer slot.  We can check the slot
1119    // as the buffer would not be moved to a different slot by the producer.
1120    return (slot.mGraphicBuffer != NULL &&
1121            item->mGraphicBuffer->handle == slot.mGraphicBuffer->handle);
1122}
1123
1124BufferQueue::ProxyConsumerListener::ProxyConsumerListener(
1125        const wp<BufferQueue::ConsumerListener>& consumerListener):
1126        mConsumerListener(consumerListener) {}
1127
1128BufferQueue::ProxyConsumerListener::~ProxyConsumerListener() {}
1129
1130void BufferQueue::ProxyConsumerListener::onFrameAvailable() {
1131    sp<BufferQueue::ConsumerListener> listener(mConsumerListener.promote());
1132    if (listener != NULL) {
1133        listener->onFrameAvailable();
1134    }
1135}
1136
1137void BufferQueue::ProxyConsumerListener::onBuffersReleased() {
1138    sp<BufferQueue::ConsumerListener> listener(mConsumerListener.promote());
1139    if (listener != NULL) {
1140        listener->onBuffersReleased();
1141    }
1142}
1143
1144}; // namespace android
1145