reactos/drivers/multimedia/audio/sndblst.old/card.c

   1 /*
   2     Sound card operations
   3
   4     http://www.cae.wisc.edu/~brodskye/sb16doc/sb16doc.html
   5 */
   6
   7 #include <ntddk.h>
   8 #include "sndblst.h"
   9
  10 VOID SetOutputSampleRate(ULONG BasePort, ULONG SampleRate)
  11 {
  12     // This only works for DSP v4.xx ONLY - need a workaround!
  13     DPRINT("Setting output sample rate\n");
  14
  15     // WAIT
  16 //    if (! WaitToSend(BasePort))
  17 //        return;
  18
  19     SB_WRITE_BYTE(BasePort, SB_SET_OUTPUT_RATE);
  20     SB_WRITE_BYTE(BasePort, SampleRate / 256);  // high
  21     SB_WRITE_BYTE(BasePort, SampleRate % 256);  // low
  22 }
  23
  24
  25 VOID EnableSpeaker(ULONG BasePort, BOOLEAN SpeakerOn)
  26 {
  27     DPRINT("Setting speaker status %d\n", SpeakerOn);
  28
  29 //    if (! WaitForWrite(BasePort))
  30 //        return;
  31
  32     SB_WRITE_BYTE(BasePort, SpeakerOn ? SB_ENABLE_SPEAKER : SB_DISABLE_SPEAKER);
  33 }
  34
  35
  36 BOOLEAN IsSpeakerEnabled(ULONG BasePort)
  37 {
  38     DPRINT("Obtaining speaker status\n");
  39
  40 //    if (! WaitToSend(BasePort))
  41 //        return FALSE;
  42
  43     SB_WRITE_BYTE(BasePort, SB_GET_SPEAKER_STATUS);
  44     if (! WaitToReceive(BasePort))
  45         return FALSE;
  46
  47     return SB_READ_DATA(BasePort) == 0xff;
  48 }
  49
  50
  51 VOID BeginPlayback(ULONG BasePort, ULONG BitDepth, ULONG Channels, ULONG BlockSize)
  52 {
  53     DPRINT("BeginPlayback(%d, %d, %d, %d)\n", BasePort, BitDepth, Channels, BlockSize);
  54
  55 //    switch(BitDepth)
  56 //    {
  57 //        case 8 :    Command = 0xc0; break;
  58 //        case 16 :   Command = 0xb0; break;  // Make sure we support it
  59 //        default :   Command = 0xc0;
  60 //    }
  61
  62     DPRINT("Initiating playback\n");
  63
  64     // TEMPORARY:
  65     SB_WRITE_BYTE(BasePort, 0xc6);
  66     SB_WRITE_BYTE(BasePort, 0); // mode - TEMPORARY
  67     SB_WRITE_BYTE(BasePort, BlockSize % 256);
  68     SB_WRITE_BYTE(BasePort, BlockSize / 256);
  69 }