src/filters/BaseClasses/fourcc.h

   1 //------------------------------------------------------------------------------
   2 // File: FourCC.h
   3 //
   4 // Desc: DirectShow base classes.
   5 //
   6 // Copyright (c) 1992-2002 Microsoft Corporation.  All rights reserved.
   7 //------------------------------------------------------------------------------
   8
   9
  10 // FOURCCMap
  11 //
  12 // provides a mapping between old-style multimedia format DWORDs
  13 // and new-style GUIDs.
  14 //
  15 // A range of 4 billion GUIDs has been allocated to ensure that this
  16 // mapping can be done straightforwardly one-to-one in both directions.
  17 //
  18 // January 95
  19
  20
  21 #ifndef __FOURCC__
  22 #define __FOURCC__
  23
  24
  25 // Multimedia format types are marked with DWORDs built from four 8-bit
  26 // chars and known as FOURCCs. New multimedia AM_MEDIA_TYPE definitions include
  27 // a subtype GUID. In order to simplify the mapping, GUIDs in the range:
  28 //    XXXXXXXX-0000-0010-8000-00AA00389B71
  29 // are reserved for FOURCCs.
  30
  31 class FOURCCMap : public GUID
  32 {
  33
  34 public:
  35     FOURCCMap();
  36     FOURCCMap(DWORD Fourcc);
  37     FOURCCMap(const GUID *);
  38
  39
  40     DWORD GetFOURCC(void);
  41     void SetFOURCC(DWORD fourcc);
  42     void SetFOURCC(const GUID *);
  43
  44 private:
  45     void InitGUID();
  46 };
  47
  48 #define GUID_Data2      0
  49 #define GUID_Data3     0x10
  50 #define GUID_Data4_1   0xaa000080
  51 #define GUID_Data4_2   0x719b3800
  52
  53 inline void
  54 FOURCCMap::InitGUID() {
  55     Data2 = GUID_Data2;
  56     Data3 = GUID_Data3;
  57     ((DWORD *)Data4)[0] = GUID_Data4_1;
  58     ((DWORD *)Data4)[1] = GUID_Data4_2;
  59 }
  60
  61 inline
  62 FOURCCMap::FOURCCMap() {
  63     InitGUID();
  64     SetFOURCC( DWORD(0));
  65 }
  66
  67 inline
  68 FOURCCMap::FOURCCMap(DWORD fourcc)
  69 {
  70     InitGUID();
  71     SetFOURCC(fourcc);
  72 }
  73
  74 inline
  75 FOURCCMap::FOURCCMap(const GUID * pGuid)
  76 {
  77     InitGUID();
  78     SetFOURCC(pGuid);
  79 }
  80
  81 inline void
  82 FOURCCMap::SetFOURCC(const GUID * pGuid)
  83 {
  84     FOURCCMap * p = (FOURCCMap*) pGuid;
  85     SetFOURCC(p->GetFOURCC());
  86 }
  87
  88 inline void
  89 FOURCCMap::SetFOURCC(DWORD fourcc)
  90 {
  91     Data1 = fourcc;
  92 }
  93
  94 inline DWORD
  95 FOURCCMap::GetFOURCC(void)
  96 {
  97     return Data1;
  98 }
  99
 100 #endif /* __FOURCC__ */
 101