240 lines
8.6 KiB
C++
240 lines
8.6 KiB
C++
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "MediaBufferGroup"
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#include <utils/Log.h>
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#include <list>
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#include <binder/MemoryDealer.h>
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#include <media/stagefright/foundation/ADebug.h>
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#include <media/stagefright/MediaBuffer.h>
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#include <media/stagefright/MediaBufferGroup.h>
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#include <utils/threads.h>
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namespace android {
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// std::min is not constexpr in C++11
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template<typename T>
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constexpr T MIN(const T &a, const T &b) { return a <= b ? a : b; }
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// MediaBufferGroup may create shared memory buffers at a
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// smaller threshold than an isolated new MediaBuffer.
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static const size_t kSharedMemoryThreshold = MIN(
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(size_t)MediaBuffer::kSharedMemThreshold, (size_t)(4 * 1024));
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struct MediaBufferGroup::InternalData {
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Mutex mLock;
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Condition mCondition;
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size_t mGrowthLimit; // Do not automatically grow group larger than this.
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std::list<MediaBufferBase *> mBuffers;
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};
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MediaBufferGroup::MediaBufferGroup(size_t growthLimit)
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: mWrapper(nullptr), mInternal(new InternalData()) {
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mInternal->mGrowthLimit = growthLimit;
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}
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MediaBufferGroup::MediaBufferGroup(size_t buffers, size_t buffer_size, size_t growthLimit)
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: mWrapper(nullptr), mInternal(new InternalData()) {
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init(buffers, buffer_size, growthLimit);
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}
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void MediaBufferGroup::init(size_t buffers, size_t buffer_size, size_t growthLimit) {
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mInternal->mGrowthLimit = growthLimit;
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if (mInternal->mGrowthLimit > 0 && buffers > mInternal->mGrowthLimit) {
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ALOGW("Preallocated buffers %zu > growthLimit %zu, increasing growthLimit",
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buffers, mInternal->mGrowthLimit);
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mInternal->mGrowthLimit = buffers;
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}
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#if !defined(NO_IMEMORY) && !defined(__ANDROID_APEX__)
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if (buffer_size >= kSharedMemoryThreshold) {
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ALOGD("creating MemoryDealer");
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// Using a single MemoryDealer is efficient for a group of shared memory objects.
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// This loop guarantees that we use shared memory (no fallback to malloc).
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size_t alignment = MemoryDealer::getAllocationAlignment();
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size_t augmented_size = buffer_size + sizeof(MediaBuffer::SharedControl);
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size_t total = (augmented_size + alignment - 1) / alignment * alignment * buffers;
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sp<MemoryDealer> memoryDealer = new MemoryDealer(total, "MediaBufferGroup");
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for (size_t i = 0; i < buffers; ++i) {
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sp<IMemory> mem = memoryDealer->allocate(augmented_size);
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if (mem.get() == nullptr || mem->unsecurePointer() == nullptr) {
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ALOGW("Only allocated %zu shared buffers of size %zu", i, buffer_size);
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break;
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}
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MediaBuffer *buffer = new MediaBuffer(mem);
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buffer->getSharedControl()->clear();
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add_buffer(buffer);
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}
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return;
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}
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#else
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(void)kSharedMemoryThreshold;
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#endif
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// Non-shared memory allocation.
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for (size_t i = 0; i < buffers; ++i) {
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MediaBuffer *buffer = new MediaBuffer(buffer_size);
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if (buffer->data() == nullptr) {
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delete buffer; // don't call release, it's not properly formed
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ALOGW("Only allocated %zu malloc buffers of size %zu", i, buffer_size);
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break;
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}
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add_buffer(buffer);
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}
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}
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MediaBufferGroup::~MediaBufferGroup() {
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for (MediaBufferBase *buffer : mInternal->mBuffers) {
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if (buffer->refcount() != 0) {
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const int localRefcount = buffer->localRefcount();
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const int remoteRefcount = buffer->remoteRefcount();
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// Fatal if we have a local refcount.
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LOG_ALWAYS_FATAL_IF(localRefcount != 0,
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"buffer(%p) localRefcount %d != 0, remoteRefcount %d",
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buffer, localRefcount, remoteRefcount);
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// Log an error if we have a remaining remote refcount,
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// as the remote process may have died or may have inappropriate behavior.
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// The shared memory associated with the MediaBuffer will
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// automatically be reclaimed when there are no remaining fds
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// associated with it.
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ALOGE("buffer(%p) has residual remoteRefcount %d",
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buffer, remoteRefcount);
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}
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// gracefully delete.
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buffer->setObserver(nullptr);
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buffer->release();
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}
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delete mInternal;
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delete mWrapper;
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}
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void MediaBufferGroup::add_buffer(MediaBufferBase *buffer) {
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Mutex::Autolock autoLock(mInternal->mLock);
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// if we're above our growth limit, release buffers if we can
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for (auto it = mInternal->mBuffers.begin();
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mInternal->mGrowthLimit > 0
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&& mInternal->mBuffers.size() >= mInternal->mGrowthLimit
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&& it != mInternal->mBuffers.end();) {
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if ((*it)->refcount() == 0) {
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(*it)->setObserver(nullptr);
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(*it)->release();
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it = mInternal->mBuffers.erase(it);
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} else {
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++it;
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}
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}
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buffer->setObserver(this);
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mInternal->mBuffers.emplace_back(buffer);
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}
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bool MediaBufferGroup::has_buffers() {
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if (mInternal->mBuffers.size() < mInternal->mGrowthLimit) {
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return true; // We can add more buffers internally.
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}
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for (MediaBufferBase *buffer : mInternal->mBuffers) {
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if (buffer->refcount() == 0) {
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return true;
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}
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}
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return false;
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}
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status_t MediaBufferGroup::acquire_buffer(
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MediaBufferBase **out, bool nonBlocking, size_t requestedSize) {
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Mutex::Autolock autoLock(mInternal->mLock);
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for (;;) {
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size_t smallest = requestedSize;
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size_t biggest = requestedSize;
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MediaBufferBase *buffer = nullptr;
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auto free = mInternal->mBuffers.end();
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for (auto it = mInternal->mBuffers.begin(); it != mInternal->mBuffers.end(); ++it) {
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const size_t size = (*it)->size();
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if (size > biggest) {
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biggest = size;
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}
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if ((*it)->refcount() == 0) {
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if (size >= requestedSize) {
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buffer = *it;
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break;
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}
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if (size < smallest) {
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smallest = size; // always free the smallest buf
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free = it;
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}
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}
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}
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if (buffer == nullptr
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&& (free != mInternal->mBuffers.end()
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|| mInternal->mBuffers.size() < mInternal->mGrowthLimit)) {
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// We alloc before we free so failure leaves group unchanged.
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const size_t allocateSize = requestedSize == 0 ? biggest :
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requestedSize < SIZE_MAX / 3 * 2 /* NB: ordering */ ?
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requestedSize * 3 / 2 : requestedSize;
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buffer = new MediaBuffer(allocateSize);
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if (buffer->data() == nullptr) {
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ALOGE("Allocation failure for size %zu", allocateSize);
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delete buffer; // Invalid alloc, prefer not to call release.
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buffer = nullptr;
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} else {
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buffer->setObserver(this);
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if (free != mInternal->mBuffers.end()) {
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ALOGV("reallocate buffer, requested size %zu vs available %zu",
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requestedSize, (*free)->size());
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(*free)->setObserver(nullptr);
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(*free)->release();
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*free = buffer; // in-place replace
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} else {
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ALOGV("allocate buffer, requested size %zu", requestedSize);
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mInternal->mBuffers.emplace_back(buffer);
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}
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}
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}
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if (buffer != nullptr) {
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buffer->add_ref();
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buffer->reset();
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*out = buffer;
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return OK;
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}
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if (nonBlocking) {
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*out = nullptr;
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return WOULD_BLOCK;
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}
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// All buffers are in use, block until one of them is returned.
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mInternal->mCondition.wait(mInternal->mLock);
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}
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// Never gets here.
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}
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size_t MediaBufferGroup::buffers() const {
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return mInternal->mBuffers.size();
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}
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void MediaBufferGroup::signalBufferReturned(MediaBufferBase *) {
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Mutex::Autolock autoLock(mInternal->mLock);
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mInternal->mCondition.signal();
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}
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} // namespace android
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