status_t MediaBufferGroup::acquire_buffer(
MediaBuffer **out, bool nonBlocking) {
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;
}
}
if (nonBlocking) {
*out = NULL;
return WOULD_BLOCK;
}
// All buffers are in use. Block until one of them is returned to us.
mCondition.wait(mLock);
}
exit:
return OK;
}
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();
}
}