Source code
Revision control
Copy as Markdown
Other Tools
/* -*- 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
#ifndef GMPSharedMemManager_h_
#define GMPSharedMemManager_h_
#include "mozilla/ipc/Shmem.h"
#include "nsTArray.h"
namespace mozilla::gmp {
class GMPSharedMemManager;
class GMPSharedMem {
public:
typedef enum {
kGMPFrameData = 0,
kGMPEncodedData,
kGMPNumTypes
} GMPMemoryClasses;
// This is a heuristic - max of 10 free in the Child pool, plus those
// in-use for the encoder and decoder at the given moment and not yet
// returned to the parent pool (which is not included). If more than
// this are needed, we presume the client has either crashed or hung
// (perhaps temporarily).
static const uint32_t kGMPBufLimit = 40;
GMPSharedMem() {
for (size_t i = 0; i < sizeof(mGmpAllocated) / sizeof(mGmpAllocated[0]);
i++) {
mGmpAllocated[i] = 0;
}
}
virtual ~GMPSharedMem() = default;
// Parent and child impls will differ here
virtual void CheckThread() = 0;
protected:
friend class GMPSharedMemManager;
nsTArray<ipc::Shmem> mGmpFreelist[GMPSharedMem::kGMPNumTypes];
uint32_t mGmpAllocated[GMPSharedMem::kGMPNumTypes];
};
class GMPSharedMemManager {
public:
explicit GMPSharedMemManager(GMPSharedMem* aData) : mData(aData) {}
virtual ~GMPSharedMemManager() = default;
virtual bool MgrAllocShmem(GMPSharedMem::GMPMemoryClasses aClass,
size_t aSize, ipc::Shmem* aMem);
virtual bool MgrDeallocShmem(GMPSharedMem::GMPMemoryClasses aClass,
ipc::Shmem& aMem);
// So we can know if data is "piling up" for the plugin - I.e. it's hung or
// crashed
virtual uint32_t NumInUse(GMPSharedMem::GMPMemoryClasses aClass);
// These have to be implemented using the AllocShmem/etc provided by the
// IPDL-generated interfaces, so have the Parent/Child implement them.
virtual bool Alloc(size_t aSize, ipc::Shmem* aMem) = 0;
virtual void Dealloc(ipc::Shmem&& aMem) = 0;
private:
nsTArray<ipc::Shmem>& GetGmpFreelist(GMPSharedMem::GMPMemoryClasses aTypes) {
return mData->mGmpFreelist[aTypes];
}
GMPSharedMem* mData;
};
} // namespace mozilla::gmp
#endif // GMPSharedMemManager_h_