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-rw-r--r--dom/media/gmp/GMPSharedMemManager.cpp98
1 files changed, 98 insertions, 0 deletions
diff --git a/dom/media/gmp/GMPSharedMemManager.cpp b/dom/media/gmp/GMPSharedMemManager.cpp
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+++ b/dom/media/gmp/GMPSharedMemManager.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPSharedMemManager.h"
+#include "GMPMessageUtils.h"
+#include "mozilla/ipc/SharedMemory.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/ClearOnShutdown.h"
+
+namespace mozilla {
+namespace gmp {
+
+// Really one set of pools on each side of the plugin API.
+
+// YUV buffers go from Encoder parent to child; pool there, and then return
+// with Decoded() frames to the Decoder parent and goes into the parent pool.
+// Compressed (encoded) data goes from the Decoder parent to the child;
+// pool there, and then return with Encoded() frames and goes into the parent
+// pool.
+bool
+GMPSharedMemManager::MgrAllocShmem(GMPSharedMem::GMPMemoryClasses aClass, size_t aSize,
+ ipc::Shmem::SharedMemory::SharedMemoryType aType,
+ ipc::Shmem* aMem)
+{
+ mData->CheckThread();
+
+ // first look to see if we have a free buffer large enough
+ for (uint32_t i = 0; i < GetGmpFreelist(aClass).Length(); i++) {
+ MOZ_ASSERT(GetGmpFreelist(aClass)[i].IsWritable());
+ if (aSize <= GetGmpFreelist(aClass)[i].Size<uint8_t>()) {
+ *aMem = GetGmpFreelist(aClass)[i];
+ GetGmpFreelist(aClass).RemoveElementAt(i);
+ return true;
+ }
+ }
+
+ // Didn't find a buffer free with enough space; allocate one
+ size_t pagesize = ipc::SharedMemory::SystemPageSize();
+ aSize = (aSize + (pagesize-1)) & ~(pagesize-1); // round up to page size
+ bool retval = Alloc(aSize, aType, aMem);
+ if (retval) {
+ // The allocator (or NeedsShmem call) should never return less than we ask for...
+ MOZ_ASSERT(aMem->Size<uint8_t>() >= aSize);
+ mData->mGmpAllocated[aClass]++;
+ }
+ return retval;
+}
+
+bool
+GMPSharedMemManager::MgrDeallocShmem(GMPSharedMem::GMPMemoryClasses aClass, ipc::Shmem& aMem)
+{
+ mData->CheckThread();
+
+ size_t size = aMem.Size<uint8_t>();
+ size_t total = 0;
+
+ // XXX Bug NNNNNNN Until we put better guards on ipc::shmem, verify we
+ // weren't fed an shmem we already had.
+ for (uint32_t i = 0; i < GetGmpFreelist(aClass).Length(); i++) {
+ if (NS_WARN_IF(aMem == GetGmpFreelist(aClass)[i])) {
+ // Safest to crash in this case; should never happen in normal
+ // operation.
+ MOZ_CRASH("Deallocating Shmem we already have in our cache!");
+ //return true;
+ }
+ }
+
+ // XXX This works; there are better pool algorithms. We need to avoid
+ // "falling off a cliff" with too low a number
+ if (GetGmpFreelist(aClass).Length() > 10) {
+ Dealloc(GetGmpFreelist(aClass)[0]);
+ GetGmpFreelist(aClass).RemoveElementAt(0);
+ // The allocation numbers will be fubar on the Child!
+ mData->mGmpAllocated[aClass]--;
+ }
+ for (uint32_t i = 0; i < GetGmpFreelist(aClass).Length(); i++) {
+ MOZ_ASSERT(GetGmpFreelist(aClass)[i].IsWritable());
+ total += GetGmpFreelist(aClass)[i].Size<uint8_t>();
+ if (size < GetGmpFreelist(aClass)[i].Size<uint8_t>()) {
+ GetGmpFreelist(aClass).InsertElementAt(i, aMem);
+ return true;
+ }
+ }
+ GetGmpFreelist(aClass).AppendElement(aMem);
+
+ return true;
+}
+
+uint32_t
+GMPSharedMemManager::NumInUse(GMPSharedMem::GMPMemoryClasses aClass)
+{
+ return mData->mGmpAllocated[aClass] - GetGmpFreelist(aClass).Length();
+}
+
+} // namespace gmp
+} // namespace mozilla