| /* |
| * Copyright (c) 2009-2011 Intel Corporation. All rights reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| |
| #define LOG_TAG "MediaBufferPool" |
| #include <utils/Log.h> |
| |
| #include <media/stagefright/MediaBuffer.h> |
| #include <media/stagefright/foundation/ADebug.h> |
| #include "MediaBufferPool.h" |
| |
| #define DEFAULT_PAGE_SIZE 4096 |
| |
| namespace android { |
| |
| MediaBufferPool::MediaBufferPool() |
| : mMaxBufferSize(0), |
| mFirstBuffer(NULL), |
| mLastBuffer(NULL) { |
| } |
| |
| MediaBufferPool::~MediaBufferPool() { |
| MediaBuffer *next; |
| for (MediaBuffer *buffer = mFirstBuffer; buffer != NULL; |
| buffer = next) { |
| next = buffer->nextBuffer(); |
| |
| CHECK_EQ(buffer->refcount(), 0); |
| |
| buffer->setObserver(NULL); |
| buffer->release(); |
| } |
| } |
| |
| status_t MediaBufferPool::acquire_buffer(int size, MediaBuffer **out) { |
| Mutex::Autolock autoLock(mLock); |
| |
| MediaBuffer *next = NULL; |
| while (mFirstBuffer) { |
| if ((int)mFirstBuffer->size() >= size) { |
| next = mFirstBuffer->nextBuffer(); |
| |
| // pop first buffer out of list |
| *out = mFirstBuffer; |
| mFirstBuffer->add_ref(); |
| mFirstBuffer->reset(); |
| |
| mFirstBuffer = next; |
| if (mFirstBuffer == NULL) { |
| mLastBuffer = NULL; |
| } |
| return OK; |
| } else { |
| // delete the first buffer from the list |
| next = mFirstBuffer->nextBuffer(); |
| mFirstBuffer->setObserver(NULL); |
| mFirstBuffer->release(); |
| mFirstBuffer = next; |
| } |
| } |
| |
| // not a single buffer matches the requirement. Allocating a new buffer. |
| |
| mFirstBuffer = NULL; |
| mLastBuffer = NULL; |
| |
| size = ((size + DEFAULT_PAGE_SIZE - 1)/DEFAULT_PAGE_SIZE) * DEFAULT_PAGE_SIZE; |
| if (size < mMaxBufferSize) { |
| size = mMaxBufferSize; |
| } else { |
| mMaxBufferSize = size; |
| } |
| MediaBuffer *p = new MediaBuffer(size); |
| *out = p; |
| return (p != NULL) ? OK : NO_MEMORY; |
| } |
| |
| void MediaBufferPool::signalBufferReturned(MediaBuffer *buffer) { |
| Mutex::Autolock autoLock(mLock); |
| |
| buffer->setObserver(this); |
| |
| if (mLastBuffer) { |
| mLastBuffer->setNextBuffer(buffer); |
| } else { |
| mFirstBuffer = buffer; |
| } |
| |
| mLastBuffer = buffer; |
| } |
| |
| } // namespace android |