rate.c File Reference

#include "precomp.h"

Include dependency graph for rate.c:

Go to the source code of this file.

Functions
BOOLEAN	SbDspIsValidInputRate (IN UCHAR MajorVersion, IN UCHAR MinorVersion, IN USHORT Rate, IN BOOLEAN Stereo)
BOOLEAN	SbDspIsValidOutputRate (IN UCHAR MajorVersion, IN UCHAR MinorVersion, IN USHORT Rate, IN BOOLEAN Stereo)
NTSTATUS	SbDsp4WriteRate (IN PUCHAR BasePort, IN USHORT Rate, IN ULONG Timeout)
NTSTATUS	SbDsp4SetOutputRate (IN PUCHAR BasePort, IN USHORT Rate, IN ULONG Timeout)
NTSTATUS	SbDsp4SetInputRate (IN PUCHAR BasePort, IN USHORT Rate, IN ULONG Timeout)

Function Documentation

SbDsp4SetInputRate()

NTSTATUS SbDsp4SetInputRate	(	IN PUCHAR	BasePort,
		IN USHORT	Rate,
		IN ULONG	Timeout
	)

Definition at line 135 of file rate.c.

{
    NTSTATUS Status;
 
    /* NOTE - No check for validity of rate! */
 
    /* Prepare to write the input rate */
    Status = SbDspWrite(BasePort, SB_DSP_OUTPUT_RATE, (Rate & 0xff00) >> 8);
    if ( Status != STATUS_SUCCESS )
        return Status;
 
    return SbDsp4WriteRate(BasePort, Rate, Timeout);
}

SbDsp4SetOutputRate()

NTSTATUS SbDsp4SetOutputRate	(	IN PUCHAR	BasePort,
		IN USHORT	Rate,
		IN ULONG	Timeout
	)

Definition at line 117 of file rate.c.

{
    NTSTATUS Status;
 
    /* NOTE - No check for validity of rate! */
 
    /* Prepare to write the output rate */
    Status = SbDspWrite(BasePort, SB_DSP_OUTPUT_RATE, (Rate & 0xff00) >> 8);
    if ( Status != STATUS_SUCCESS )
        return Status;
 
    return SbDsp4WriteRate(BasePort, Rate, Timeout);
}

SbDsp4WriteRate()

NTSTATUS SbDsp4WriteRate	(	IN PUCHAR	BasePort,
		IN USHORT	Rate,
		IN ULONG	Timeout
	)

Definition at line 94 of file rate.c.

{
    NTSTATUS Status;
 
    /* NOTE - No check for validity of rate! */
 
    /* Write high byte */
    Status = SbDspWrite(BasePort, (Rate & 0xff00) >> 8, Timeout);
    if ( Status != STATUS_SUCCESS )
        return Status;
 
    /* Write low byte */
    Status = SbDspWrite(BasePort, Rate & 0xff, Timeout);
    if ( Status != STATUS_SUCCESS )
        return Status;
 
    return Status;
}

Referenced by SbDsp4SetInputRate(), and SbDsp4SetOutputRate().

SbDspIsValidInputRate()

BOOLEAN SbDspIsValidInputRate	(	IN UCHAR	MajorVersion,
		IN UCHAR	MinorVersion,
		IN USHORT	Rate,
		IN BOOLEAN	Stereo
	)

Definition at line 19 of file rate.c.

{
    if ( MajorVersion == 1 )
    {
        if ( Stereo )
            return FALSE;
 
        return ( ( Rate >= 4000 ) && ( Rate <= 13000 ) );
    }
    else if ( MajorVersion == 2 )
    {
        if ( Stereo )
            return FALSE;
 
        if ( MinorVersion == 0 )
            return ( ( Rate >= 4000 ) && ( Rate <= 15000 ) );
        else
            return ( ( Rate >= 4000 ) && ( Rate <= 44100 ) );
    }
    else if ( MajorVersion == 3 )
    {
        if ( Stereo )
            return FALSE;
 
        return ( ( Rate >= 4000 ) && ( Rate <= 13000 ) );
    }
    else /* 4.00 and above */
    {
        return ( ( Rate >= 5000 ) && ( Rate <= 44100 ) );
    }
}

SbDspIsValidOutputRate()

BOOLEAN SbDspIsValidOutputRate	(	IN UCHAR	MajorVersion,
		IN UCHAR	MinorVersion,
		IN USHORT	Rate,
		IN BOOLEAN	Stereo
	)

Definition at line 56 of file rate.c.

{
    if ( MajorVersion == 1 )
    {
        if ( Stereo )
            return FALSE;
 
        return ( ( Rate >= 4000 ) && ( Rate <= 23000 ) );
    }
    else if ( MajorVersion == 2 )
    {
        if ( Stereo )
            return FALSE;
 
        if ( MinorVersion == 0 )
            return ( ( Rate >= 4000 ) && ( Rate <= 23000 ) );
        else
            return ( ( Rate >= 4000 ) && ( Rate <= 44100 ) );
    }
    else if ( MajorVersion == 3 )
    {
        if ( ! Stereo )
            return ( ( Rate >= 4000 ) && ( Rate <= 44100 ) );
        else
            return ( ( Rate >= 11025 ) && ( Rate <= 22050 ) );
    }
    else /* 4.00 and above */
    {
        return ( ( Rate >= 5000 ) && ( Rate <= 44100 ) );
    }
}