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70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
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Sound card operations
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http://www.cae.wisc.edu/~brodskye/sb16doc/sb16doc.html
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*/
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#include <ntddk.h>
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#include "sndblst.h"
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VOID SetOutputSampleRate(ULONG BasePort, ULONG SampleRate)
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{
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// This only works for DSP v4.xx ONLY - need a workaround!
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DPRINT("Setting output sample rate\n");
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// WAIT
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// if (! WaitToSend(BasePort))
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// return;
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SB_WRITE_BYTE(BasePort, SB_SET_OUTPUT_RATE);
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SB_WRITE_BYTE(BasePort, SampleRate / 256); // high
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SB_WRITE_BYTE(BasePort, SampleRate % 256); // low
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}
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VOID EnableSpeaker(ULONG BasePort, BOOLEAN SpeakerOn)
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{
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DPRINT("Setting speaker status %d\n", SpeakerOn);
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// if (! WaitForWrite(BasePort))
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// return;
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SB_WRITE_BYTE(BasePort, SpeakerOn ? SB_ENABLE_SPEAKER : SB_DISABLE_SPEAKER);
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}
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BOOLEAN IsSpeakerEnabled(ULONG BasePort)
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{
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DPRINT("Obtaining speaker status\n");
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// if (! WaitToSend(BasePort))
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// return FALSE;
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SB_WRITE_BYTE(BasePort, SB_GET_SPEAKER_STATUS);
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if (! WaitToReceive(BasePort))
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return FALSE;
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return SB_READ_DATA(BasePort) == 0xff;
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}
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VOID BeginPlayback(ULONG BasePort, ULONG BitDepth, ULONG Channels, ULONG BlockSize)
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{
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DPRINT("BeginPlayback(%d, %d, %d, %d)\n", BasePort, BitDepth, Channels, BlockSize);
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// switch(BitDepth)
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// {
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// case 8 : Command = 0xc0; break;
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// case 16 : Command = 0xb0; break; // Make sure we support it
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// default : Command = 0xc0;
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// }
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DPRINT("Initiating playback\n");
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// TEMPORARY:
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SB_WRITE_BYTE(BasePort, 0xc6);
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SB_WRITE_BYTE(BasePort, 0); // mode - TEMPORARY
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SB_WRITE_BYTE(BasePort, BlockSize % 256);
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SB_WRITE_BYTE(BasePort, BlockSize / 256);
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}
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