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();
}
}
void OmxDecoder::ReleaseAllPendingVideoBuffersLocked()
{
Vector<BufferItem> releasingVideoBuffers;
{
Mutex::Autolock autoLock(mPendingVideoBuffersLock);
int size = mPendingVideoBuffers.size();
for (int i = 0; i < size; i++) {
releasingVideoBuffers.push(mPendingVideoBuffers[i]);
}
mPendingVideoBuffers.clear();
}
// Free all pending video buffers without holding mPendingVideoBuffersLock.
int size = releasingVideoBuffers.size();
for (int i = 0; i < size; i++) {
MediaBuffer *buffer;
buffer = releasingVideoBuffers[i].mMediaBuffer;
#if defined(MOZ_WIDGET_GONK) && ANDROID_VERSION >= 17
android::sp<Fence> fence;
int fenceFd = -1;
fence = releasingVideoBuffers[i].mReleaseFenceHandle.mFence;
if (fence.get() && fence->isValid()) {
fenceFd = fence->dup();
}
MOZ_ASSERT(buffer->refcount() == 1);
// This code expect MediaBuffer's ref count is 1.
// Return gralloc buffer to ANativeWindow
ANativeWindow* window = static_cast<ANativeWindow*>(mNativeWindowClient.get());
window->cancelBuffer(window,
buffer->graphicBuffer().get(),
fenceFd);
// Mark MediaBuffer as rendered.
// When gralloc buffer is directly returned to ANativeWindow,
// this mark is necesary.
sp<MetaData> metaData = buffer->meta_data();
metaData->setInt32(kKeyRendered, 1);
#endif
// Return MediaBuffer to OMXCodec.
buffer->release();
}
releasingVideoBuffers.clear();
}