mirror of
https://github.com/reactos/reactos.git
synced 2024-09-09 12:20:21 +00:00
152 lines
3.2 KiB
C
152 lines
3.2 KiB
C
/*
|
|
ReactOS Sound System
|
|
Sound Blaster DSP support
|
|
Sample rate routines
|
|
|
|
Author:
|
|
Andrew Greenwood (silverblade@reactos.org)
|
|
|
|
History:
|
|
2 July 2008 - Created (split from sbdsp.c)
|
|
|
|
Notes:
|
|
Functions documented in sbdsp.h
|
|
*/
|
|
|
|
#include "precomp.h"
|
|
|
|
BOOLEAN
|
|
SbDspIsValidInputRate(
|
|
IN UCHAR MajorVersion,
|
|
IN UCHAR MinorVersion,
|
|
IN USHORT Rate,
|
|
IN BOOLEAN Stereo)
|
|
{
|
|
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 ) );
|
|
}
|
|
}
|
|
|
|
BOOLEAN
|
|
SbDspIsValidOutputRate(
|
|
IN UCHAR MajorVersion,
|
|
IN UCHAR MinorVersion,
|
|
IN USHORT Rate,
|
|
IN BOOLEAN Stereo)
|
|
{
|
|
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 ) );
|
|
}
|
|
}
|
|
|
|
/* Internal routine - call only after submitting one of the rate commands */
|
|
NTSTATUS
|
|
SbDsp4WriteRate(
|
|
IN PUCHAR BasePort,
|
|
IN USHORT Rate,
|
|
IN ULONG Timeout)
|
|
{
|
|
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;
|
|
}
|
|
|
|
NTSTATUS
|
|
SbDsp4SetOutputRate(
|
|
IN PUCHAR BasePort,
|
|
IN USHORT Rate,
|
|
IN ULONG Timeout)
|
|
{
|
|
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);
|
|
}
|
|
|
|
NTSTATUS
|
|
SbDsp4SetInputRate(
|
|
IN PUCHAR BasePort,
|
|
IN USHORT Rate,
|
|
IN ULONG Timeout)
|
|
{
|
|
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);
|
|
}
|
|
|