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151 lines
3.3 KiB
C
151 lines
3.3 KiB
C
/*
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ReactOS Sound System
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Sound Blaster DSP support
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Sample rate routines
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Author:
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Andrew Greenwood (silverblade@reactos.org)
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History:
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2 July 2008 - Created (split from sbdsp.c)
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Notes:
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Functions documented in sbdsp.h
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*/
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#include "precomp.h"
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BOOLEAN
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SbDspIsValidInputRate(
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IN UCHAR MajorVersion,
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IN UCHAR MinorVersion,
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IN USHORT Rate,
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IN BOOLEAN Stereo)
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{
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if ( MajorVersion == 1 )
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{
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if ( Stereo )
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return FALSE;
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return ( ( Rate >= 4000 ) && ( Rate <= 13000 ) );
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}
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else if ( MajorVersion == 2 )
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{
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if ( Stereo )
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return FALSE;
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if ( MinorVersion == 0 )
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return ( ( Rate >= 4000 ) && ( Rate <= 15000 ) );
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else
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return ( ( Rate >= 4000 ) && ( Rate <= 44100 ) );
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}
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else if ( MajorVersion == 3 )
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{
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if ( Stereo )
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return FALSE;
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return ( ( Rate >= 4000 ) && ( Rate <= 13000 ) );
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}
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else /* 4.00 and above */
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{
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return ( ( Rate >= 5000 ) && ( Rate <= 44100 ) );
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}
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}
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BOOLEAN
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SbDspIsValidOutputRate(
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IN UCHAR MajorVersion,
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IN UCHAR MinorVersion,
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IN USHORT Rate,
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IN BOOLEAN Stereo)
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{
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if ( MajorVersion == 1 )
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{
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if ( Stereo )
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return FALSE;
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return ( ( Rate >= 4000 ) && ( Rate <= 23000 ) );
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}
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else if ( MajorVersion == 2 )
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{
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if ( Stereo )
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return FALSE;
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if ( MinorVersion == 0 )
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return ( ( Rate >= 4000 ) && ( Rate <= 23000 ) );
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else
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return ( ( Rate >= 4000 ) && ( Rate <= 44100 ) );
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}
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else if ( MajorVersion == 3 )
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{
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if ( ! Stereo )
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return ( ( Rate >= 4000 ) && ( Rate <= 44100 ) );
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else
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return ( ( Rate >= 11025 ) && ( Rate <= 22050 ) );
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}
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else /* 4.00 and above */
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{
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return ( ( Rate >= 5000 ) && ( Rate <= 44100 ) );
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}
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}
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/* Internal routine - call only after submitting one of the rate commands */
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NTSTATUS
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SbDsp4WriteRate(
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IN PUCHAR BasePort,
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IN USHORT Rate,
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IN ULONG Timeout)
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{
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NTSTATUS Status;
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/* NOTE - No check for validity of rate! */
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/* Write high byte */
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Status = SbDspWrite(BasePort, (Rate & 0xff00) >> 8, Timeout);
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if ( Status != STATUS_SUCCESS )
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return Status;
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/* Write low byte */
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Status = SbDspWrite(BasePort, Rate & 0xff, Timeout);
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if ( Status != STATUS_SUCCESS )
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return Status;
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return Status;
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}
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NTSTATUS
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SbDsp4SetOutputRate(
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IN PUCHAR BasePort,
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IN USHORT Rate,
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IN ULONG Timeout)
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{
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NTSTATUS Status;
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/* NOTE - No check for validity of rate! */
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/* Prepare to write the output rate */
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Status = SbDspWrite(BasePort, SB_DSP_OUTPUT_RATE, (Rate & 0xff00) >> 8);
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if ( Status != STATUS_SUCCESS )
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return Status;
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return SbDsp4WriteRate(BasePort, Rate, Timeout);
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}
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NTSTATUS
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SbDsp4SetInputRate(
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IN PUCHAR BasePort,
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IN USHORT Rate,
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IN ULONG Timeout)
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{
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NTSTATUS Status;
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/* NOTE - No check for validity of rate! */
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/* Prepare to write the input rate */
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Status = SbDspWrite(BasePort, SB_DSP_OUTPUT_RATE, (Rate & 0xff00) >> 8);
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if ( Status != STATUS_SUCCESS )
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return Status;
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return SbDsp4WriteRate(BasePort, Rate, Timeout);
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}
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