BufferQueue.cpp revision 753e3415cdaa99f9453d1ea71b163bf1b148e127 
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
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__)
40
41#define ATRACE_BUFFER_INDEX(index)                                            \
42    if (ATRACE_ENABLED()) {                                                   \
43        char ___traceBuf[1024];                                               \
44        snprintf(___traceBuf, 1024, "%s: %d", mConsumerName.string(),         \
45                (index));                                                     \
46        android::ScopedTrace ___bufTracer(ATRACE_TAG, ___traceBuf);           \
47    }
48
49namespace android {
50
51// Get an ID that's unique within this process.
52static int32_t createProcessUniqueId() {
53    static volatile int32_t globalCounter = 0;
54    return android_atomic_inc(&globalCounter);
55}
56
57static 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";
63    }
64}
65
66BufferQueue::BufferQueue(bool allowSynchronousMode,
67        const sp<IGraphicBufferAlloc>& allocator) :
68    mDefaultWidth(1),
69    mDefaultHeight(1),
70    mMaxAcquiredBufferCount(1),
71    mDefaultMaxBufferCount(2),
72    mOverrideMaxBufferCount(0),
73    mSynchronousMode(false),
74    mAllowSynchronousMode(allowSynchronousMode),
75    mConnectedApi(NO_CONNECTED_API),
76    mAbandoned(false),
77    mFrameCounter(0),
78    mBufferHasBeenQueued(false),
79    mDefaultBufferFormat(PIXEL_FORMAT_RGBA_8888),
80    mConsumerUsageBits(0),
81    mTransformHint(0)
82{
83    // Choose a name using the PID and a process-unique ID.
84    mConsumerName = String8::format("unnamed-%d-%d", getpid(), createProcessUniqueId());
85
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()");
92        }
93    } else {
94        mGraphicBufferAlloc = allocator;
95    }
96}
97
98BufferQueue::~BufferQueue() {
99    ST_LOGV("~BufferQueue");
100}
101
102status_t BufferQueue::setDefaultMaxBufferCountLocked(int count) {
103    if (count < 2 || count > NUM_BUFFER_SLOTS)
104        return BAD_VALUE;
105
106    mDefaultMaxBufferCount = count;
107    mDequeueCondition.broadcast();
108
109    return NO_ERROR;
110}
111
112bool BufferQueue::isSynchronousMode() const {
113    Mutex::Autolock lock(mMutex);
114    return mSynchronousMode;
115}
116
117void BufferQueue::setConsumerName(const String8& name) {
118    Mutex::Autolock lock(mMutex);
119    mConsumerName = name;
120}
121
122status_t BufferQueue::setDefaultBufferFormat(uint32_t defaultFormat) {
123    Mutex::Autolock lock(mMutex);
124    mDefaultBufferFormat = defaultFormat;
125    return NO_ERROR;
126}
127
128status_t BufferQueue::setConsumerUsageBits(uint32_t usage) {
129    Mutex::Autolock lock(mMutex);
130    mConsumerUsageBits = usage;
131    return NO_ERROR;
132}
133
134status_t BufferQueue::setTransformHint(uint32_t hint) {
135    ST_LOGV("setTransformHint: %02x", hint);
136    Mutex::Autolock lock(mMutex);
137    mTransformHint = hint;
138    return NO_ERROR;
139}
140
141status_t BufferQueue::setBufferCount(int bufferCount) {
142    ST_LOGV("setBufferCount: count=%d", bufferCount);
143
144    sp<ConsumerListener> listener;
145    {
146        Mutex::Autolock lock(mMutex);
147
148        if (mAbandoned) {
149            ST_LOGE("setBufferCount: BufferQueue has been abandoned!");
150            return NO_INIT;
151        }
152        if (bufferCount > NUM_BUFFER_SLOTS) {
153            ST_LOGE("setBufferCount: bufferCount too large (max %d)",
154                    NUM_BUFFER_SLOTS);
155            return BAD_VALUE;
156        }
157
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");
163                return -EINVAL;
164            }
165        }
166
167        const int minBufferSlots = getMinMaxBufferCountLocked();
168        if (bufferCount == 0) {
169            mOverrideMaxBufferCount = 0;
170            mDequeueCondition.broadcast();
171            return NO_ERROR;
172        }
173
174        if (bufferCount < minBufferSlots) {
175            ST_LOGE("setBufferCount: requested buffer count (%d) is less than "
176                    "minimum (%d)", bufferCount, minBufferSlots);
177            return BAD_VALUE;
178        }
179
180        // here we're guaranteed that the client doesn't have dequeued buffers
181        // and will release all of its buffer references.
182        //
183        // XXX: Should this use drainQueueAndFreeBuffersLocked instead?
184        freeAllBuffersLocked();
185        mOverrideMaxBufferCount = bufferCount;
186        mBufferHasBeenQueued = false;
187        mDequeueCondition.broadcast();
188        listener = mConsumerListener;
189    } // scope for lock
190
191    if (listener != NULL) {
192        listener->onBuffersReleased();
193    }
194
195    return NO_ERROR;
196}
197
198int BufferQueue::query(int what, int* outValue)
199{
200    ATRACE_CALL();
201    Mutex::Autolock lock(mMutex);
202
203    if (mAbandoned) {
204        ST_LOGE("query: BufferQueue has been abandoned!");
205        return NO_INIT;
206    }
207
208    int value;
209    switch (what) {
210    case NATIVE_WINDOW_WIDTH:
211        value = mDefaultWidth;
212        break;
213    case NATIVE_WINDOW_HEIGHT:
214        value = mDefaultHeight;
215        break;
216    case NATIVE_WINDOW_FORMAT:
217        value = mDefaultBufferFormat;
218        break;
219    case NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS:
220        value = getMinUndequeuedBufferCountLocked();
221        break;
222    case NATIVE_WINDOW_CONSUMER_RUNNING_BEHIND:
223        value = (mQueue.size() >= 2);
224        break;
225    default:
226        return BAD_VALUE;
227    }
228    outValue[0] = value;
229    return NO_ERROR;
230}
231
232status_t BufferQueue::requestBuffer(int slot, sp<GraphicBuffer>* buf) {
233    ATRACE_CALL();
234    ST_LOGV("requestBuffer: slot=%d", slot);
235    Mutex::Autolock lock(mMutex);
236    if (mAbandoned) {
237        ST_LOGE("requestBuffer: BufferQueue has been abandoned!");
238        return NO_INIT;
239    }
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);
244        return BAD_VALUE;
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
248        // the case.
249        ST_LOGE("requestBuffer: slot %d is not owned by the client (state=%d)",
250                slot, mSlots[slot].mBufferState);
251        return BAD_VALUE;
252    }
253    mSlots[slot].mRequestBufferCalled = true;
254    *buf = mSlots[slot].mGraphicBuffer;
255    return NO_ERROR;
256}
257
258status_t BufferQueue::dequeueBuffer(int *outBuf, sp<Fence>* outFence,
259        uint32_t w, uint32_t h, uint32_t format, uint32_t usage) {
260    ATRACE_CALL();
261    ST_LOGV("dequeueBuffer: w=%d h=%d fmt=%#x usage=%#x", w, h, format, usage);
262
263    if ((w && !h) || (!w && h)) {
264        ST_LOGE("dequeueBuffer: invalid size: w=%u, h=%u", w, h);
265        return BAD_VALUE;
266    }
267
268    status_t returnFlags(OK);
269    EGLDisplay dpy = EGL_NO_DISPLAY;
270    EGLSyncKHR eglFence = EGL_NO_SYNC_KHR;
271
272    { // Scope for the lock
273        Mutex::Autolock lock(mMutex);
274
275        if (format == 0) {
276            format = mDefaultBufferFormat;
277        }
278        // turn on usage bits the consumer requested
279        usage |= mConsumerUsageBits;
280
281        int found = -1;
282        int dequeuedCount = 0;
283        bool tryAgain = true;
284        while (tryAgain) {
285            if (mAbandoned) {
286                ST_LOGE("dequeueBuffer: BufferQueue has been abandoned!");
287                return NO_INIT;
288            }
289
290            const int maxBufferCount = getMaxBufferCountLocked();
291
292            // Free up any buffers that are in slots beyond the max buffer
293            // count.
294            for (int i = maxBufferCount; i < NUM_BUFFER_SLOTS; i++) {
295                assert(mSlots[i].mBufferState == BufferSlot::FREE);
296                if (mSlots[i].mGraphicBuffer != NULL) {
297                    freeBufferLocked(i);
298                    returnFlags |= IGraphicBufferProducer::RELEASE_ALL_BUFFERS;
299                }
300            }
301
302            // look for a free buffer to give to the client
303            found = INVALID_BUFFER_SLOT;
304            dequeuedCount = 0;
305            for (int i = 0; i < maxBufferCount; i++) {
306                const int state = mSlots[i].mBufferState;
307                if (state == BufferSlot::DEQUEUED) {
308                    dequeuedCount++;
309                }
310
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
315                     * buffers in flight.
316                     */
317                    if ((found < 0) ||
318                            mSlots[i].mFrameNumber < mSlots[found].mFrameNumber) {
319                        found = i;
320                    }
321                }
322            }
323
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");
329                return -EINVAL;
330            }
331
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
337                // than allowed.
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,
344                            newUndequeuedCount);
345                    return -EBUSY;
346                }
347            }
348
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;
352            if (tryAgain) {
353                mDequeueCondition.wait(mMutex);
354            }
355        }
356
357
358        if (found == INVALID_BUFFER_SLOT) {
359            // This should not happen.
360            ST_LOGE("dequeueBuffer: no available buffer slots");
361            return -EBUSY;
362        }
363
364        const int buf = found;
365        *outBuf = found;
366
367        ATRACE_BUFFER_INDEX(buf);
368
369        const bool useDefaultSize = !w && !h;
370        if (useDefaultSize) {
371            // use the default size
372            w = mDefaultWidth;
373            h = mDefaultHeight;
374        }
375
376        mSlots[buf].mBufferState = BufferSlot::DEQUEUED;
377
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))
384        {
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;
391
392            returnFlags |= IGraphicBufferProducer::BUFFER_NEEDS_REALLOCATION;
393        }
394
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;
400    }  // end lock scope
401
402    if (returnFlags & IGraphicBufferProducer::BUFFER_NEEDS_REALLOCATION) {
403        status_t error;
404        sp<GraphicBuffer> graphicBuffer(
405                mGraphicBufferAlloc->createGraphicBuffer(
406                        w, h, format, usage, &error));
407        if (graphicBuffer == 0) {
408            ST_LOGE("dequeueBuffer: SurfaceComposer::createGraphicBuffer "
409                    "failed");
410            return error;
411        }
412
413        { // Scope for the lock
414            Mutex::Autolock lock(mMutex);
415
416            if (mAbandoned) {
417                ST_LOGE("dequeueBuffer: BufferQueue has been abandoned!");
418                return NO_INIT;
419            }
420
421            mSlots[*outBuf].mGraphicBuffer = graphicBuffer;
422        }
423    }
424
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");
434        }
435        eglDestroySyncKHR(dpy, eglFence);
436    }
437
438    ST_LOGV("dequeueBuffer: returning slot=%d buf=%p flags=%#x", *outBuf,
439            mSlots[*outBuf].mGraphicBuffer->handle, returnFlags);
440
441    return returnFlags;
442}
443
444status_t BufferQueue::setSynchronousMode(bool enabled) {
445    ATRACE_CALL();
446    ST_LOGV("setSynchronousMode: enabled=%d", enabled);
447    Mutex::Autolock lock(mMutex);
448
449    if (mAbandoned) {
450        ST_LOGE("setSynchronousMode: BufferQueue has been abandoned!");
451        return NO_INIT;
452    }
453
454    status_t err = OK;
455    if (!mAllowSynchronousMode && enabled)
456        return err;
457
458    if (!enabled) {
459        // going to asynchronous mode, drain the queue
460        err = drainQueueLocked();
461        if (err != NO_ERROR)
462            return err;
463    }
464
465    if (mSynchronousMode != enabled) {
466        // - if we're going to asynchronous mode, the queue is guaranteed to be
467        // empty here
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();
472    }
473    return err;
474}
475
476status_t BufferQueue::queueBuffer(int buf,
477        const QueueBufferInput& input, QueueBufferOutput* output) {
478    ATRACE_CALL();
479    ATRACE_BUFFER_INDEX(buf);
480
481    Rect crop;
482    uint32_t transform;
483    int scalingMode;
484    int64_t timestamp;
485    sp<Fence> fence;
486
487    input.deflate(&timestamp, &crop, &scalingMode, &transform, &fence);
488
489    if (fence == NULL) {
490        ST_LOGE("queueBuffer: fence is NULL");
491        return BAD_VALUE;
492    }
493
494    ST_LOGV("queueBuffer: slot=%d time=%#llx crop=[%d,%d,%d,%d] tr=%#x "
495            "scale=%s",
496            buf, timestamp, crop.left, crop.top, crop.right, crop.bottom,
497            transform, scalingModeName(scalingMode));
498
499    sp<ConsumerListener> listener;
500
501    { // scope for the lock
502        Mutex::Autolock lock(mMutex);
503        if (mAbandoned) {
504            ST_LOGE("queueBuffer: BufferQueue has been abandoned!");
505            return NO_INIT;
506        }
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);
511            return -EINVAL;
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);
515            return -EINVAL;
516        } else if (!mSlots[buf].mRequestBufferCalled) {
517            ST_LOGE("queueBuffer: slot %d was enqueued without requesting a "
518                    "buffer", buf);
519            return -EINVAL;
520        }
521
522        const sp<GraphicBuffer>& graphicBuffer(mSlots[buf].mGraphicBuffer);
523        Rect bufferRect(graphicBuffer->getWidth(), graphicBuffer->getHeight());
524        Rect croppedCrop;
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);
529            return -EINVAL;
530        }
531
532        if (mSynchronousMode) {
533            // In synchronous mode we queue all buffers in a FIFO.
534            mQueue.push_back(buf);
535
536            // Synchronous mode always signals that an additional frame should
537            // be consumed.
538            listener = mConsumerListener;
539        } else {
540            // In asynchronous mode we only keep the most recent buffer.
541            if (mQueue.empty()) {
542                mQueue.push_back(buf);
543
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;
548            } else {
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
553                *front = buf;
554            }
555        }
556
557        mSlots[buf].mTimestamp = timestamp;
558        mSlots[buf].mCrop = crop;
559        mSlots[buf].mTransform = transform;
560        mSlots[buf].mFence = fence;
561
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:
566                break;
567            default:
568                ST_LOGE("unknown scaling mode: %d (ignoring)", scalingMode);
569                scalingMode = mSlots[buf].mScalingMode;
570                break;
571        }
572
573        mSlots[buf].mBufferState = BufferSlot::QUEUED;
574        mSlots[buf].mScalingMode = scalingMode;
575        mFrameCounter++;
576        mSlots[buf].mFrameNumber = mFrameCounter;
577
578        mBufferHasBeenQueued = true;
579        mDequeueCondition.broadcast();
580
581        output->inflate(mDefaultWidth, mDefaultHeight, mTransformHint,
582                mQueue.size());
583
584        ATRACE_INT(mConsumerName.string(), mQueue.size());
585    } // scope for the lock
586
587    // call back without lock held
588    if (listener != 0) {
589        listener->onFrameAvailable();
590    }
591    return NO_ERROR;
592}
593
594void BufferQueue::cancelBuffer(int buf, const sp<Fence>& fence) {
595    ATRACE_CALL();
596    ST_LOGV("cancelBuffer: slot=%d", buf);
597    Mutex::Autolock lock(mMutex);
598
599    if (mAbandoned) {
600        ST_LOGW("cancelBuffer: BufferQueue has been abandoned!");
601        return;
602    }
603
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);
608        return;
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);
612        return;
613    } else if (fence == NULL) {
614        ST_LOGE("cancelBuffer: fence is NULL");
615        return;
616    }
617    mSlots[buf].mBufferState = BufferSlot::FREE;
618    mSlots[buf].mFrameNumber = 0;
619    mSlots[buf].mFence = fence;
620    mDequeueCondition.broadcast();
621}
622
623status_t BufferQueue::connect(int api, QueueBufferOutput* output) {
624    ATRACE_CALL();
625    ST_LOGV("connect: api=%d", api);
626    Mutex::Autolock lock(mMutex);
627
628    if (mAbandoned) {
629        ST_LOGE("connect: BufferQueue has been abandoned!");
630        return NO_INIT;
631    }
632
633    if (mConsumerListener == NULL) {
634        ST_LOGE("connect: BufferQueue has no consumer!");
635        return NO_INIT;
636    }
637
638    int err = NO_ERROR;
639    switch (api) {
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)",
646                        mConnectedApi, api);
647                err = -EINVAL;
648            } else {
649                mConnectedApi = api;
650                output->inflate(mDefaultWidth, mDefaultHeight, mTransformHint,
651                        mQueue.size());
652            }
653            break;
654        default:
655            err = -EINVAL;
656            break;
657    }
658
659    mBufferHasBeenQueued = false;
660
661    return err;
662}
663
664status_t BufferQueue::disconnect(int api) {
665    ATRACE_CALL();
666    ST_LOGV("disconnect: api=%d", api);
667
668    int err = NO_ERROR;
669    sp<ConsumerListener> listener;
670
671    { // Scope for the lock
672        Mutex::Autolock lock(mMutex);
673
674        if (mAbandoned) {
675            // it is not really an error to disconnect after the surface
676            // has been abandoned, it should just be a no-op.
677            return NO_ERROR;
678        }
679
680        switch (api) {
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;
690                } else {
691                    ST_LOGE("disconnect: connected to another api (cur=%d, req=%d)",
692                            mConnectedApi, api);
693                    err = -EINVAL;
694                }
695                break;
696            default:
697                ST_LOGE("disconnect: unknown API %d", api);
698                err = -EINVAL;
699                break;
700        }
701    }
702
703    if (listener != NULL) {
704        listener->onBuffersReleased();
705    }
706
707    return err;
708}
709
710void BufferQueue::dump(String8& result) const
711{
712    char buffer[1024];
713    BufferQueue::dump(result, "", buffer, 1024);
714}
715
716void BufferQueue::dump(String8& result, const char* prefix,
717        char* buffer, size_t SIZE) const
718{
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       snprintf(buffer, SIZE, "%02d ", *i++);
726       fifoSize++;
727       fifo.append(buffer);
728    }
729
730    int maxBufferCount = getMaxBufferCountLocked();
731
732    snprintf(buffer, SIZE,
733            "%s-BufferQueue maxBufferCount=%d, mSynchronousMode=%d, default-size=[%dx%d], "
734            "default-format=%d, transform-hint=%02x, FIFO(%d)={%s}\n",
735            prefix, maxBufferCount, mSynchronousMode, mDefaultWidth,
736            mDefaultHeight, mDefaultBufferFormat, mTransformHint,
737            fifoSize, fifo.string());
738    result.append(buffer);
739
740
741    struct {
742        const char * operator()(int state) const {
743            switch (state) {
744                case BufferSlot::DEQUEUED: return "DEQUEUED";
745                case BufferSlot::QUEUED: return "QUEUED";
746                case BufferSlot::FREE: return "FREE";
747                case BufferSlot::ACQUIRED: return "ACQUIRED";
748                default: return "Unknown";
749            }
750        }
751    } stateName;
752
753    for (int i=0 ; i<maxBufferCount ; i++) {
754        const BufferSlot& slot(mSlots[i]);
755        snprintf(buffer, SIZE,
756                "%s%s[%02d] "
757                "state=%-8s, crop=[%d,%d,%d,%d], "
758                "xform=0x%02x, time=%#llx, scale=%s",
759                prefix, (slot.mBufferState == BufferSlot::ACQUIRED)?">":" ", i,
760                stateName(slot.mBufferState),
761                slot.mCrop.left, slot.mCrop.top, slot.mCrop.right,
762                slot.mCrop.bottom, slot.mTransform, slot.mTimestamp,
763                scalingModeName(slot.mScalingMode)
764        );
765        result.append(buffer);
766
767        const sp<GraphicBuffer>& buf(slot.mGraphicBuffer);
768        if (buf != NULL) {
769            snprintf(buffer, SIZE,
770                    ", %p [%4ux%4u:%4u,%3X]",
771                    buf->handle, buf->width, buf->height, buf->stride,
772                    buf->format);
773            result.append(buffer);
774        }
775        result.append("\n");
776    }
777}
778
779void BufferQueue::freeBufferLocked(int slot) {
780    ST_LOGV("freeBufferLocked: slot=%d", slot);
781    mSlots[slot].mGraphicBuffer = 0;
782    if (mSlots[slot].mBufferState == BufferSlot::ACQUIRED) {
783        mSlots[slot].mNeedsCleanupOnRelease = true;
784    }
785    mSlots[slot].mBufferState = BufferSlot::FREE;
786    mSlots[slot].mFrameNumber = 0;
787    mSlots[slot].mAcquireCalled = false;
788
789    // destroy fence as BufferQueue now takes ownership
790    if (mSlots[slot].mEglFence != EGL_NO_SYNC_KHR) {
791        eglDestroySyncKHR(mSlots[slot].mEglDisplay, mSlots[slot].mEglFence);
792        mSlots[slot].mEglFence = EGL_NO_SYNC_KHR;
793    }
794    mSlots[slot].mFence = Fence::NO_FENCE;
795}
796
797void BufferQueue::freeAllBuffersLocked() {
798    ALOGW_IF(!mQueue.isEmpty(),
799            "freeAllBuffersLocked called but mQueue is not empty");
800    mQueue.clear();
801    mBufferHasBeenQueued = false;
802    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
803        freeBufferLocked(i);
804    }
805}
806
807status_t BufferQueue::acquireBuffer(BufferItem *buffer) {
808    ATRACE_CALL();
809    Mutex::Autolock _l(mMutex);
810
811    // Check that the consumer doesn't currently have the maximum number of
812    // buffers acquired.  We allow the max buffer count to be exceeded by one
813    // buffer, so that the consumer can successfully set up the newly acquired
814    // buffer before releasing the old one.
815    int numAcquiredBuffers = 0;
816    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
817        if (mSlots[i].mBufferState == BufferSlot::ACQUIRED) {
818            numAcquiredBuffers++;
819        }
820    }
821    if (numAcquiredBuffers >= mMaxAcquiredBufferCount+1) {
822        ST_LOGE("acquireBuffer: max acquired buffer count reached: %d (max=%d)",
823                numAcquiredBuffers, mMaxAcquiredBufferCount);
824        return INVALID_OPERATION;
825    }
826
827    // check if queue is empty
828    // In asynchronous mode the list is guaranteed to be one buffer
829    // deep, while in synchronous mode we use the oldest buffer.
830    if (!mQueue.empty()) {
831        Fifo::iterator front(mQueue.begin());
832        int buf = *front;
833
834        ATRACE_BUFFER_INDEX(buf);
835
836        if (mSlots[buf].mAcquireCalled) {
837            buffer->mGraphicBuffer = NULL;
838        } else {
839            buffer->mGraphicBuffer = mSlots[buf].mGraphicBuffer;
840        }
841        buffer->mCrop = mSlots[buf].mCrop;
842        buffer->mTransform = mSlots[buf].mTransform;
843        buffer->mScalingMode = mSlots[buf].mScalingMode;
844        buffer->mFrameNumber = mSlots[buf].mFrameNumber;
845        buffer->mTimestamp = mSlots[buf].mTimestamp;
846        buffer->mBuf = buf;
847        buffer->mFence = mSlots[buf].mFence;
848
849        mSlots[buf].mAcquireCalled = true;
850        mSlots[buf].mNeedsCleanupOnRelease = false;
851        mSlots[buf].mBufferState = BufferSlot::ACQUIRED;
852        mSlots[buf].mFence = Fence::NO_FENCE;
853
854        mQueue.erase(front);
855        mDequeueCondition.broadcast();
856
857        ATRACE_INT(mConsumerName.string(), mQueue.size());
858    } else {
859        return NO_BUFFER_AVAILABLE;
860    }
861
862    return NO_ERROR;
863}
864
865status_t BufferQueue::releaseBuffer(int buf, EGLDisplay display,
866        EGLSyncKHR eglFence, const sp<Fence>& fence) {
867    ATRACE_CALL();
868    ATRACE_BUFFER_INDEX(buf);
869
870    Mutex::Autolock _l(mMutex);
871
872    if (buf == INVALID_BUFFER_SLOT || fence == NULL) {
873        return BAD_VALUE;
874    }
875
876    mSlots[buf].mEglDisplay = display;
877    mSlots[buf].mEglFence = eglFence;
878    mSlots[buf].mFence = fence;
879
880    // The buffer can now only be released if its in the acquired state
881    if (mSlots[buf].mBufferState == BufferSlot::ACQUIRED) {
882        mSlots[buf].mBufferState = BufferSlot::FREE;
883    } else if (mSlots[buf].mNeedsCleanupOnRelease) {
884        ST_LOGV("releasing a stale buf %d its state was %d", buf, mSlots[buf].mBufferState);
885        mSlots[buf].mNeedsCleanupOnRelease = false;
886        return STALE_BUFFER_SLOT;
887    } else {
888        ST_LOGE("attempted to release buf %d but its state was %d", buf, mSlots[buf].mBufferState);
889        return -EINVAL;
890    }
891
892    mDequeueCondition.broadcast();
893    return NO_ERROR;
894}
895
896status_t BufferQueue::consumerConnect(const sp<ConsumerListener>& consumerListener) {
897    ST_LOGV("consumerConnect");
898    Mutex::Autolock lock(mMutex);
899
900    if (mAbandoned) {
901        ST_LOGE("consumerConnect: BufferQueue has been abandoned!");
902        return NO_INIT;
903    }
904    if (consumerListener == NULL) {
905        ST_LOGE("consumerConnect: consumerListener may not be NULL");
906        return BAD_VALUE;
907    }
908
909    mConsumerListener = consumerListener;
910
911    return NO_ERROR;
912}
913
914status_t BufferQueue::consumerDisconnect() {
915    ST_LOGV("consumerDisconnect");
916    Mutex::Autolock lock(mMutex);
917
918    if (mConsumerListener == NULL) {
919        ST_LOGE("consumerDisconnect: No consumer is connected!");
920        return -EINVAL;
921    }
922
923    mAbandoned = true;
924    mConsumerListener = NULL;
925    mQueue.clear();
926    freeAllBuffersLocked();
927    mDequeueCondition.broadcast();
928    return NO_ERROR;
929}
930
931status_t BufferQueue::getReleasedBuffers(uint32_t* slotMask) {
932    ST_LOGV("getReleasedBuffers");
933    Mutex::Autolock lock(mMutex);
934
935    if (mAbandoned) {
936        ST_LOGE("getReleasedBuffers: BufferQueue has been abandoned!");
937        return NO_INIT;
938    }
939
940    uint32_t mask = 0;
941    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
942        if (!mSlots[i].mAcquireCalled) {
943            mask |= 1 << i;
944        }
945    }
946    *slotMask = mask;
947
948    ST_LOGV("getReleasedBuffers: returning mask %#x", mask);
949    return NO_ERROR;
950}
951
952status_t BufferQueue::setDefaultBufferSize(uint32_t w, uint32_t h)
953{
954    ST_LOGV("setDefaultBufferSize: w=%d, h=%d", w, h);
955    if (!w || !h) {
956        ST_LOGE("setDefaultBufferSize: dimensions cannot be 0 (w=%d, h=%d)",
957                w, h);
958        return BAD_VALUE;
959    }
960
961    Mutex::Autolock lock(mMutex);
962    mDefaultWidth = w;
963    mDefaultHeight = h;
964    return NO_ERROR;
965}
966
967status_t BufferQueue::setDefaultMaxBufferCount(int bufferCount) {
968    ATRACE_CALL();
969    Mutex::Autolock lock(mMutex);
970    return setDefaultMaxBufferCountLocked(bufferCount);
971}
972
973status_t BufferQueue::setMaxAcquiredBufferCount(int maxAcquiredBuffers) {
974    ATRACE_CALL();
975    Mutex::Autolock lock(mMutex);
976    if (maxAcquiredBuffers < 1 || maxAcquiredBuffers > MAX_MAX_ACQUIRED_BUFFERS) {
977        ST_LOGE("setMaxAcquiredBufferCount: invalid count specified: %d",
978                maxAcquiredBuffers);
979        return BAD_VALUE;
980    }
981    if (mConnectedApi != NO_CONNECTED_API) {
982        return INVALID_OPERATION;
983    }
984    mMaxAcquiredBufferCount = maxAcquiredBuffers;
985    return NO_ERROR;
986}
987
988void BufferQueue::freeAllBuffersExceptHeadLocked() {
989    int head = -1;
990    if (!mQueue.empty()) {
991        Fifo::iterator front(mQueue.begin());
992        head = *front;
993    }
994    mBufferHasBeenQueued = false;
995    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
996        if (i != head) {
997            freeBufferLocked(i);
998        }
999    }
1000}
1001
1002status_t BufferQueue::drainQueueLocked() {
1003    while (mSynchronousMode && mQueue.size() > 1) {
1004        mDequeueCondition.wait(mMutex);
1005        if (mAbandoned) {
1006            ST_LOGE("drainQueueLocked: BufferQueue has been abandoned!");
1007            return NO_INIT;
1008        }
1009        if (mConnectedApi == NO_CONNECTED_API) {
1010            ST_LOGE("drainQueueLocked: BufferQueue is not connected!");
1011            return NO_INIT;
1012        }
1013    }
1014    return NO_ERROR;
1015}
1016
1017status_t BufferQueue::drainQueueAndFreeBuffersLocked() {
1018    status_t err = drainQueueLocked();
1019    if (err == NO_ERROR) {
1020        if (mQueue.empty()) {
1021            freeAllBuffersLocked();
1022        } else {
1023            freeAllBuffersExceptHeadLocked();
1024        }
1025    }
1026    return err;
1027}
1028
1029int BufferQueue::getMinMaxBufferCountLocked() const {
1030    return getMinUndequeuedBufferCountLocked() + 1;
1031}
1032
1033int BufferQueue::getMinUndequeuedBufferCountLocked() const {
1034    return mSynchronousMode ? mMaxAcquiredBufferCount :
1035            mMaxAcquiredBufferCount + 1;
1036}
1037
1038int BufferQueue::getMaxBufferCountLocked() const {
1039    int minMaxBufferCount = getMinMaxBufferCountLocked();
1040
1041    int maxBufferCount = mDefaultMaxBufferCount;
1042    if (maxBufferCount < minMaxBufferCount) {
1043        maxBufferCount = minMaxBufferCount;
1044    }
1045    if (mOverrideMaxBufferCount != 0) {
1046        assert(mOverrideMaxBufferCount >= minMaxBufferCount);
1047        maxBufferCount = mOverrideMaxBufferCount;
1048    }
1049
1050    // Any buffers that are dequeued by the producer or sitting in the queue
1051    // waiting to be consumed need to have their slots preserved.  Such
1052    // buffers will temporarily keep the max buffer count up until the slots
1053    // no longer need to be preserved.
1054    for (int i = maxBufferCount; i < NUM_BUFFER_SLOTS; i++) {
1055        BufferSlot::BufferState state = mSlots[i].mBufferState;
1056        if (state == BufferSlot::QUEUED || state == BufferSlot::DEQUEUED) {
1057            maxBufferCount = i + 1;
1058        }
1059    }
1060
1061    return maxBufferCount;
1062}
1063
1064BufferQueue::ProxyConsumerListener::ProxyConsumerListener(
1065        const wp<BufferQueue::ConsumerListener>& consumerListener):
1066        mConsumerListener(consumerListener) {}
1067
1068BufferQueue::ProxyConsumerListener::~ProxyConsumerListener() {}
1069
1070void BufferQueue::ProxyConsumerListener::onFrameAvailable() {
1071    sp<BufferQueue::ConsumerListener> listener(mConsumerListener.promote());
1072    if (listener != NULL) {
1073        listener->onFrameAvailable();
1074    }
1075}
1076
1077void BufferQueue::ProxyConsumerListener::onBuffersReleased() {
1078    sp<BufferQueue::ConsumerListener> listener(mConsumerListener.promote());
1079    if (listener != NULL) {
1080        listener->onBuffersReleased();
1081    }
1082}
1083
1084}; // namespace android
1085