Andreas Huber | 20111aa | 2009-07-14 16:56:47 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2009 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 "MediaBufferGroup" |
| 18 | #include <utils/Log.h> |
| 19 | |
James Dong | f1d5aa1 | 2012-02-06 23:46:37 -0800 | [diff] [blame] | 20 | #include <media/stagefright/foundation/ADebug.h> |
Andreas Huber | 20111aa | 2009-07-14 16:56:47 -0700 | [diff] [blame] | 21 | #include <media/stagefright/MediaBuffer.h> |
| 22 | #include <media/stagefright/MediaBufferGroup.h> |
| 23 | |
| 24 | namespace android { |
| 25 | |
| 26 | MediaBufferGroup::MediaBufferGroup() |
| 27 | : mFirstBuffer(NULL), |
| 28 | mLastBuffer(NULL) { |
| 29 | } |
| 30 | |
| 31 | MediaBufferGroup::~MediaBufferGroup() { |
| 32 | MediaBuffer *next; |
| 33 | for (MediaBuffer *buffer = mFirstBuffer; buffer != NULL; |
| 34 | buffer = next) { |
| 35 | next = buffer->nextBuffer(); |
| 36 | |
Andreas Huber | 0c89199 | 2009-08-26 14:48:20 -0700 | [diff] [blame] | 37 | CHECK_EQ(buffer->refcount(), 0); |
Andreas Huber | 20111aa | 2009-07-14 16:56:47 -0700 | [diff] [blame] | 38 | |
| 39 | buffer->setObserver(NULL); |
| 40 | buffer->release(); |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | void MediaBufferGroup::add_buffer(MediaBuffer *buffer) { |
| 45 | Mutex::Autolock autoLock(mLock); |
| 46 | |
| 47 | buffer->setObserver(this); |
| 48 | |
| 49 | if (mLastBuffer) { |
| 50 | mLastBuffer->setNextBuffer(buffer); |
| 51 | } else { |
| 52 | mFirstBuffer = buffer; |
| 53 | } |
| 54 | |
| 55 | mLastBuffer = buffer; |
| 56 | } |
| 57 | |
| 58 | status_t MediaBufferGroup::acquire_buffer(MediaBuffer **out) { |
| 59 | Mutex::Autolock autoLock(mLock); |
| 60 | |
| 61 | for (;;) { |
| 62 | for (MediaBuffer *buffer = mFirstBuffer; |
| 63 | buffer != NULL; buffer = buffer->nextBuffer()) { |
| 64 | if (buffer->refcount() == 0) { |
| 65 | buffer->add_ref(); |
| 66 | buffer->reset(); |
| 67 | |
| 68 | *out = buffer; |
| 69 | goto exit; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | // All buffers are in use. Block until one of them is returned to us. |
| 74 | mCondition.wait(mLock); |
| 75 | } |
| 76 | |
| 77 | exit: |
| 78 | return OK; |
| 79 | } |
| 80 | |
| 81 | void MediaBufferGroup::signalBufferReturned(MediaBuffer *) { |
| 82 | Mutex::Autolock autoLock(mLock); |
| 83 | mCondition.signal(); |
| 84 | } |
| 85 | |
| 86 | } // namespace android |