/src/mozilla-central/dom/media/gmp/GMPSharedMemManager.h
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1 | | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
2 | | /* This Source Code Form is subject to the terms of the Mozilla Public |
3 | | * License, v. 2.0. If a copy of the MPL was not distributed with this |
4 | | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
5 | | |
6 | | #ifndef GMPSharedMemManager_h_ |
7 | | #define GMPSharedMemManager_h_ |
8 | | |
9 | | #include "mozilla/ipc/Shmem.h" |
10 | | #include "nsTArray.h" |
11 | | |
12 | | namespace mozilla { |
13 | | namespace gmp { |
14 | | |
15 | | class GMPSharedMemManager; |
16 | | |
17 | | class GMPSharedMem |
18 | | { |
19 | | public: |
20 | | typedef enum { |
21 | | kGMPFrameData = 0, |
22 | | kGMPEncodedData, |
23 | | kGMPNumTypes |
24 | | } GMPMemoryClasses; |
25 | | |
26 | | // This is a heuristic - max of 10 free in the Child pool, plus those |
27 | | // in-use for the encoder and decoder at the given moment and not yet |
28 | | // returned to the parent pool (which is not included). If more than |
29 | | // this are needed, we presume the client has either crashed or hung |
30 | | // (perhaps temporarily). |
31 | | static const uint32_t kGMPBufLimit = 20; |
32 | | |
33 | | GMPSharedMem() |
34 | 0 | { |
35 | 0 | for (size_t i = 0; i < sizeof(mGmpAllocated)/sizeof(mGmpAllocated[0]); i++) { |
36 | 0 | mGmpAllocated[i] = 0; |
37 | 0 | } |
38 | 0 | } |
39 | 0 | virtual ~GMPSharedMem() {} |
40 | | |
41 | | // Parent and child impls will differ here |
42 | | virtual void CheckThread() = 0; |
43 | | |
44 | | protected: |
45 | | friend class GMPSharedMemManager; |
46 | | |
47 | | nsTArray<ipc::Shmem> mGmpFreelist[GMPSharedMem::kGMPNumTypes]; |
48 | | uint32_t mGmpAllocated[GMPSharedMem::kGMPNumTypes]; |
49 | | }; |
50 | | |
51 | | class GMPSharedMemManager |
52 | | { |
53 | | public: |
54 | 0 | explicit GMPSharedMemManager(GMPSharedMem *aData) : mData(aData) {} |
55 | 0 | virtual ~GMPSharedMemManager() {} |
56 | | |
57 | | virtual bool MgrAllocShmem(GMPSharedMem::GMPMemoryClasses aClass, size_t aSize, |
58 | | ipc::Shmem::SharedMemory::SharedMemoryType aType, |
59 | | ipc::Shmem* aMem); |
60 | | virtual bool MgrDeallocShmem(GMPSharedMem::GMPMemoryClasses aClass, ipc::Shmem& aMem); |
61 | | |
62 | | // So we can know if data is "piling up" for the plugin - I.e. it's hung or crashed |
63 | | virtual uint32_t NumInUse(GMPSharedMem::GMPMemoryClasses aClass); |
64 | | |
65 | | // These have to be implemented using the AllocShmem/etc provided by the IPDL-generated interfaces, |
66 | | // so have the Parent/Child implement them. |
67 | | virtual bool Alloc(size_t aSize, ipc::Shmem::SharedMemory::SharedMemoryType aType, ipc::Shmem* aMem) = 0; |
68 | | virtual void Dealloc(ipc::Shmem& aMem) = 0; |
69 | | |
70 | | private: |
71 | | nsTArray<ipc::Shmem>& GetGmpFreelist(GMPSharedMem::GMPMemoryClasses aTypes) |
72 | 0 | { |
73 | 0 | return mData->mGmpFreelist[aTypes]; |
74 | 0 | } |
75 | | |
76 | | GMPSharedMem *mData; |
77 | | }; |
78 | | |
79 | | } // namespace gmp |
80 | | } // namespace mozilla |
81 | | |
82 | | #endif // GMPSharedMemManager_h_ |