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C/C++ Source or Header  |  2001-10-08  |  4KB  |  120 lines
  1. //------------------------------------------------------------------------------
  2. // File: MPEGType.h
  3. //
  4. // Desc: MPEG system stream compound type definition
  5. //
  6. // Copyright (c) 1996-2001, Microsoft Corporation.  All rights reserved.
  7. //------------------------------------------------------------------------------
  8.  
  9.  
  10. #ifndef __MPEGTYPE__
  11. #define __MPEGTYPE__
  12.  
  13. #ifdef __cplusplus
  14. extern "C" {
  15. #endif // __cplusplus
  16.  
  17. //
  18. //  AM_MPEGSYSTEMTYPE defines the format block contents for
  19. //  data of type MEDIATYPE_MPEG1System when the format
  20. //  block GUID is FORMAT_MPEG1System
  21. //
  22. //  The format block consists of elements of type
  23. //  AM_MPEGSYSTEMTYPE up to the length of the format block
  24. //  Each format block is 8-byte aligned from the start of
  25. //  the format block
  26. //
  27.  
  28. typedef struct tagAM_MPEGSTREAMTYPE
  29. {
  30.     DWORD             dwStreamId;     // Stream id of stream to process
  31.     DWORD             dwReserved;     // 8-byte alignment
  32.     AM_MEDIA_TYPE     mt;             // Type for substream - pbFormat is NULL
  33.     BYTE              bFormat[1];     // Format data
  34. } AM_MPEGSTREAMTYPE;
  35.  
  36. typedef struct tagAM_MPEGSYSTEMTYPE
  37. {
  38.     DWORD             dwBitRate;      // Bits per second
  39.     DWORD             cStreams;       // Number of streams
  40.     AM_MPEGSTREAMTYPE Streams[1];
  41. } AM_MPEGSYSTEMTYPE;
  42.  
  43. //
  44. //  Helper macros for AM_MPEGSTREAMTYPE
  45. //
  46. #define AM_MPEGSTREAMTYPE_ELEMENTLENGTH(pStreamType)  \
  47.     FIELD_OFFSET(AM_MPEGSTREAMTYPE, bFormat[(pStreamType)->mt.cbFormat])
  48. #define AM_MPEGSTREAMTYPE_NEXT(pStreamType)           \
  49.     ((AM_MPEGSTREAMTYPE *)((PBYTE)(pStreamType) +     \
  50.      ((AM_MPEGSTREAMTYPE_ELEMENTLENGTH(pStreamType) + 7) & ~7)))
  51.  
  52. //
  53. // IMpegAudioDecoder
  54. //
  55.  
  56. // Values for DualMode
  57. #define AM_MPEG_AUDIO_DUAL_MERGE 0
  58. #define AM_MPEG_AUDIO_DUAL_LEFT  1
  59. #define AM_MPEG_AUDIO_DUAL_RIGHT 2
  60.  
  61. DECLARE_INTERFACE_(IMpegAudioDecoder, IUnknown) {
  62.  
  63.     STDMETHOD(get_FrequencyDivider) (THIS_
  64.                            unsigned long *pDivider   /* [out] */
  65.                            ) PURE;
  66.  
  67.     STDMETHOD(put_FrequencyDivider) (THIS_
  68.                            unsigned long Divider     /* [in] */
  69.                            ) PURE;
  70.  
  71.     STDMETHOD(get_DecoderAccuracy) (THIS_
  72.                            unsigned long *pAccuracy  /* [out] */
  73.                            ) PURE;
  74.  
  75.     STDMETHOD(put_DecoderAccuracy) (THIS_
  76.                            unsigned long Accuracy    /* [in] */
  77.                            ) PURE;
  78.  
  79.     STDMETHOD(get_Stereo) (THIS_
  80.                            unsigned long *pStereo    /* [out] */
  81.                            ) PURE;
  82.  
  83.     STDMETHOD(put_Stereo) (THIS_
  84.                            unsigned long Stereo      /* [in] */
  85.                            ) PURE;
  86.  
  87.     STDMETHOD(get_DecoderWordSize) (THIS_
  88.                            unsigned long *pWordSize  /* [out] */
  89.                            ) PURE;
  90.  
  91.     STDMETHOD(put_DecoderWordSize) (THIS_
  92.                            unsigned long WordSize    /* [in] */
  93.                            ) PURE;
  94.  
  95.     STDMETHOD(get_IntegerDecode) (THIS_
  96.                            unsigned long *pIntDecode /* [out] */
  97.                            ) PURE;
  98.  
  99.     STDMETHOD(put_IntegerDecode) (THIS_
  100.                            unsigned long IntDecode   /* [in] */
  101.                            ) PURE;
  102.  
  103.     STDMETHOD(get_DualMode) (THIS_
  104.                            unsigned long *pIntDecode /* [out] */
  105.                            ) PURE;
  106.  
  107.     STDMETHOD(put_DualMode) (THIS_
  108.                            unsigned long IntDecode   /* [in] */
  109.                            ) PURE;
  110.  
  111.     STDMETHOD(get_AudioFormat) (THIS_
  112.                            MPEG1WAVEFORMAT *lpFmt    /* [out] */
  113.                            ) PURE;
  114. };
  115.  
  116. #ifdef __cplusplus
  117. }
  118. #endif // __cplusplus
  119. #endif // __MPEGTYPE__
  120.