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 <ntddk.h>
  17 #include <debug.h>
  18
  19 #include <sbdsp.h>
  20
  21 BOOLEAN
  22 SbDspIsValidInputRate(
  23     IN  UCHAR MajorVersion,
  24     IN  UCHAR MinorVersion,
  25     IN  USHORT Rate,
  26     IN  BOOLEAN Stereo)
  27 {
  28     if ( MajorVersion == 1 )
  29     {
  30         if ( Stereo )
  31             return FALSE;
  32
  33         return ( ( Rate >= 4000 ) && ( Rate <= 13000 ) );
  34     }
  35     else if ( MajorVersion == 2 )
  36     {
  37         if ( Stereo )
  38             return FALSE;
  39
  40         if ( MinorVersion == 0 )
  41             return ( ( Rate >= 4000 ) && ( Rate <= 15000 ) );
  42         else
  43             return ( ( Rate >= 4000 ) && ( Rate <= 44100 ) );
  44     }
  45     else if ( MajorVersion == 3 )
  46     {
  47         if ( Stereo )
  48             return FALSE;
  49
  50         return ( ( Rate >= 4000 ) && ( Rate <= 13000 ) );
  51     }
  52     else /* 4.00 and above */
  53     {
  54         return ( ( Rate >= 5000 ) && ( Rate <= 44100 ) );
  55     }
  56 }
  57
  58 BOOLEAN
  59 SbDspIsValidOutputRate(
  60     IN  UCHAR MajorVersion,
  61     IN  UCHAR MinorVersion,
  62     IN  USHORT Rate,
  63     IN  BOOLEAN Stereo)
  64 {
  65     if ( MajorVersion == 1 )
  66     {
  67         if ( Stereo )
  68             return FALSE;
  69
  70         return ( ( Rate >= 4000 ) && ( Rate <= 23000 ) );
  71     }
  72     else if ( MajorVersion == 2 )
  73     {
  74         if ( Stereo )
  75             return FALSE;
  76
  77         if ( MinorVersion == 0 )
  78             return ( ( Rate >= 4000 ) && ( Rate <= 23000 ) );
  79         else
  80             return ( ( Rate >= 4000 ) && ( Rate <= 44100 ) );
  81     }
  82     else if ( MajorVersion == 3 )
  83     {
  84         if ( ! Stereo )
  85             return ( ( Rate >= 4000 ) && ( Rate <= 44100 ) );
  86         else
  87             return ( ( Rate >= 11025 ) && ( Rate <= 22050 ) );
  88     }
  89     else /* 4.00 and above */
  90     {
  91         return ( ( Rate >= 5000 ) && ( Rate <= 44100 ) );
  92     }
  93 }
  94
  95 /* Internal routine - call only after submitting one of the rate commands */
  96 NTSTATUS
  97 SbDsp4WriteRate(
  98     IN  PUCHAR BasePort,
  99     IN  USHORT Rate,
 100     IN  ULONG Timeout)
 101 {
 102     NTSTATUS Status;
 103
 104     /* NOTE - No check for validity of rate! */
 105
 106     /* Write high byte */
 107     Status = SbDspWrite(BasePort, (Rate & 0xff00) >> 8, Timeout);
 108     if ( Status != STATUS_SUCCESS )
 109         return Status;
 110
 111     /* Write low byte */
 112     Status = SbDspWrite(BasePort, Rate & 0xff, Timeout);
 113     if ( Status != STATUS_SUCCESS )
 114         return Status;
 115
 116     return Status;
 117 }
 118
 119 NTSTATUS
 120 SbDsp4SetOutputRate(
 121     IN  PUCHAR BasePort,
 122     IN  USHORT Rate,
 123     IN  ULONG Timeout)
 124 {
 125     NTSTATUS Status;
 126
 127     /* NOTE - No check for validity of rate! */
 128
 129     /* Prepare to write the output rate */
 130     Status = SbDspWrite(BasePort, SB_DSP_OUTPUT_RATE, (Rate & 0xff00) >> 8);
 131     if ( Status != STATUS_SUCCESS )
 132         return Status;
 133
 134     return SbDsp4WriteRate(BasePort, Rate, Timeout);
 135 }
 136
 137 NTSTATUS
 138 SbDsp4SetInputRate(
 139     IN  PUCHAR BasePort,
 140     IN  USHORT Rate,
 141     IN  ULONG Timeout)
 142 {
 143     NTSTATUS Status;
 144
 145     /* NOTE - No check for validity of rate! */
 146
 147     /* Prepare to write the input rate */
 148     Status = SbDspWrite(BasePort, SB_DSP_OUTPUT_RATE, (Rate & 0xff00) >> 8);
 149     if ( Status != STATUS_SUCCESS )
 150         return Status;
 151
 152     return SbDsp4WriteRate(BasePort, Rate, Timeout);
 153 }
 154