lib/drivers/sound/soundblaster/rate.c

   1 /*
   2     ReactOS Sound System
   3     Sound Blaster DSP support
   4     Sample rate routines
   5
   6     Author:
   7         Andrew Greenwood (silverblade@reactos.org)
   8
   9     History:
  10         2 July 2008 - Created (split from sbdsp.c)
  11
  12     Notes:
  13         Functions documented in sbdsp.h
  14 */
  15
  16 #include "precomp.h"
  17
  18 BOOLEAN
  19 SbDspIsValidInputRate(
  20     IN  UCHAR MajorVersion,
  21     IN  UCHAR MinorVersion,
  22     IN  USHORT Rate,
  23     IN  BOOLEAN Stereo)
  24 {
  25     if ( MajorVersion == 1 )
  26     {
  27         if ( Stereo )
  28             return FALSE;
  29
  30         return ( ( Rate >= 4000 ) && ( Rate <= 13000 ) );
  31     }
  32     else if ( MajorVersion == 2 )
  33     {
  34         if ( Stereo )
  35             return FALSE;
  36
  37         if ( MinorVersion == 0 )
  38             return ( ( Rate >= 4000 ) && ( Rate <= 15000 ) );
  39         else
  40             return ( ( Rate >= 4000 ) && ( Rate <= 44100 ) );
  41     }
  42     else if ( MajorVersion == 3 )
  43     {
  44         if ( Stereo )
  45             return FALSE;
  46
  47         return ( ( Rate >= 4000 ) && ( Rate <= 13000 ) );
  48     }
  49     else /* 4.00 and above */
  50     {
  51         return ( ( Rate >= 5000 ) && ( Rate <= 44100 ) );
  52     }
  53 }
  54
  55 BOOLEAN
  56 SbDspIsValidOutputRate(
  57     IN  UCHAR MajorVersion,
  58     IN  UCHAR MinorVersion,
  59     IN  USHORT Rate,
  60     IN  BOOLEAN Stereo)
  61 {
  62     if ( MajorVersion == 1 )
  63     {
  64         if ( Stereo )
  65             return FALSE;
  66
  67         return ( ( Rate >= 4000 ) && ( Rate <= 23000 ) );
  68     }
  69     else if ( MajorVersion == 2 )
  70     {
  71         if ( Stereo )
  72             return FALSE;
  73
  74         if ( MinorVersion == 0 )
  75             return ( ( Rate >= 4000 ) && ( Rate <= 23000 ) );
  76         else
  77             return ( ( Rate >= 4000 ) && ( Rate <= 44100 ) );
  78     }
  79     else if ( MajorVersion == 3 )
  80     {
  81         if ( ! Stereo )
  82             return ( ( Rate >= 4000 ) && ( Rate <= 44100 ) );
  83         else
  84             return ( ( Rate >= 11025 ) && ( Rate <= 22050 ) );
  85     }
  86     else /* 4.00 and above */
  87     {
  88         return ( ( Rate >= 5000 ) && ( Rate <= 44100 ) );
  89     }
  90 }
  91
  92 /* Internal routine - call only after submitting one of the rate commands */
  93 NTSTATUS
  94 SbDsp4WriteRate(
  95     IN  PUCHAR BasePort,
  96     IN  USHORT Rate,
  97     IN  ULONG Timeout)
  98 {
  99     NTSTATUS Status;
 100
 101     /* NOTE - No check for validity of rate! */
 102
 103     /* Write high byte */
 104     Status = SbDspWrite(BasePort, (Rate & 0xff00) >> 8, Timeout);
 105     if ( Status != STATUS_SUCCESS )
 106         return Status;
 107
 108     /* Write low byte */
 109     Status = SbDspWrite(BasePort, Rate & 0xff, Timeout);
 110     if ( Status != STATUS_SUCCESS )
 111         return Status;
 112
 113     return Status;
 114 }
 115
 116 NTSTATUS
 117 SbDsp4SetOutputRate(
 118     IN  PUCHAR BasePort,
 119     IN  USHORT Rate,
 120     IN  ULONG Timeout)
 121 {
 122     NTSTATUS Status;
 123
 124     /* NOTE - No check for validity of rate! */
 125
 126     /* Prepare to write the output rate */
 127     Status = SbDspWrite(BasePort, SB_DSP_OUTPUT_RATE, (Rate & 0xff00) >> 8);
 128     if ( Status != STATUS_SUCCESS )
 129         return Status;
 130
 131     return SbDsp4WriteRate(BasePort, Rate, Timeout);
 132 }
 133
 134 NTSTATUS
 135 SbDsp4SetInputRate(
 136     IN  PUCHAR BasePort,
 137     IN  USHORT Rate,
 138     IN  ULONG Timeout)
 139 {
 140     NTSTATUS Status;
 141
 142     /* NOTE - No check for validity of rate! */
 143
 144     /* Prepare to write the input rate */
 145     Status = SbDspWrite(BasePort, SB_DSP_OUTPUT_RATE, (Rate & 0xff00) >> 8);
 146     if ( Status != STATUS_SUCCESS )
 147         return Status;
 148
 149     return SbDsp4WriteRate(BasePort, Rate, Timeout);
 150 }
 151