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/*
* Copyright (C) 2009 The Android Open Source Project
*
* 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 "MediaBufferGroup"
#include <utils/Log.h>
#include <media/stagefright/foundation/ADebug.h>
#include <media/stagefright/MediaBuffer.h>
#include <media/stagefright/MediaBufferGroup.h>
namespace android {
MediaBufferGroup::MediaBufferGroup()
: mFirstBuffer(NULL),
mLastBuffer(NULL) {
}
MediaBufferGroup::~MediaBufferGroup() {
MediaBuffer *next;
for (MediaBuffer *buffer = mFirstBuffer; buffer != NULL;
buffer = next) {
next = buffer->nextBuffer();
CHECK_EQ(buffer->refcount(), 0);
buffer->setObserver(NULL);
buffer->release();
}
}
void MediaBufferGroup::add_buffer(MediaBuffer *buffer) {
Mutex::Autolock autoLock(mLock);
buffer->setObserver(this);
if (mLastBuffer) {
mLastBuffer->setNextBuffer(buffer);
} else {
mFirstBuffer = buffer;
}
mLastBuffer = buffer;
}
status_t MediaBufferGroup::acquire_buffer(MediaBuffer **out) {
Mutex::Autolock autoLock(mLock);
for (;;) {
for (MediaBuffer *buffer = mFirstBuffer;
buffer != NULL; buffer = buffer->nextBuffer()) {
if (buffer->refcount() == 0) {
buffer->add_ref();
buffer->reset();
*out = buffer;
goto exit;
}
}
// All buffers are in use. Block until one of them is returned to us.
mCondition.wait(mLock);
}
exit:
return OK;
}
void MediaBufferGroup::signalBufferReturned(MediaBuffer *) {
Mutex::Autolock autoLock(mLock);
mCondition.signal();
}
} // namespace android
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