// cmdmute.cpp : Defines the entry point for the console application.
//
// Time-stamp: <2002/04/11, 01:41:54 (EST), maverick, cmdmute.cpp>

#include <stdio.h>
#include <windows.h>

const char* version = // hehe, we need a version number for this?
"CmdMute - Written by Maverick Woo <maverick@cs.cmu.edu>";

VOID usage() {

  printf("Usage: cmdmute [0|1]\n");
  printf("         0 - Mute OFF\n");
  printf("         1 - Mute ON\n");
  printf("       Toggle if no argument is given.\n");
  printf("       Status message printed to STDERR.\n");
  printf("       Errorlevel indicates mute status.\n");
  exit(2);

}

UINT nNumMixers;
HMIXER hMixer;
MIXERCAPS mxcaps;

BOOL mmInit() {

  nNumMixers = mixerGetNumDevs();
  hMixer = NULL;
  ZeroMemory(&mxcaps, sizeof(MIXERCAPS));

  if(nNumMixers != 0) {

    if (mixerOpen(&hMixer, 0, 0, NULL, MIXER_OBJECTF_MIXER)
        !=
        MMSYSERR_NOERROR) {
      return FALSE;
    }

    if (mixerGetDevCaps((UINT)hMixer, &mxcaps, sizeof(MIXERCAPS))
        !=
        MMSYSERR_NOERROR) {
      return FALSE;
    }

  }

  return hMixer != NULL;

}

BOOL mmClose() {

  return mixerClose(hMixer) == MMSYSERR_NOERROR;

}

BOOL mmGetMuteControl(DWORD* id) {

  // get dwLineID
  MIXERLINE mxl;
  mxl.cbStruct = sizeof(MIXERLINE);
  mxl.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;

  if (mixerGetLineInfo((HMIXEROBJ)hMixer,
                       &mxl,
                       MIXER_OBJECTF_HMIXER |
                       MIXER_GETLINEINFOF_COMPONENTTYPE)
      !=
      MMSYSERR_NOERROR) {
    return FALSE;
  }

  // get dwControlID
  MIXERCONTROL mxc;
  MIXERLINECONTROLS mxlc;
  mxlc.cbStruct = sizeof(MIXERLINECONTROLS);
  mxlc.dwLineID = mxl.dwLineID;
  mxlc.dwControlType = MIXERCONTROL_CONTROLTYPE_MUTE;
  mxlc.cControls = 1;
  mxlc.cbmxctrl = sizeof(MIXERCONTROL);
  mxlc.pamxctrl = &mxc;

  if (mixerGetLineControls((HMIXEROBJ)hMixer,
                           &mxlc,
                           MIXER_OBJECTF_HMIXER |
                           MIXER_GETLINECONTROLSF_ONEBYTYPE)
      !=
      MMSYSERR_NOERROR) {
    return FALSE;
  }

  *id = mxc.dwControlID;

  return TRUE;
}

BOOL mmGetMuteValue(DWORD id, LONG* value) {

  MIXERCONTROLDETAILS_BOOLEAN mxcdMute;
  MIXERCONTROLDETAILS mxcd;
  mxcd.cbStruct = sizeof(MIXERCONTROLDETAILS);
  mxcd.dwControlID = id;
  mxcd.cChannels = 1;
  mxcd.cMultipleItems = 0;
  mxcd.cbDetails = sizeof(MIXERCONTROLDETAILS_BOOLEAN);
  mxcd.paDetails = &mxcdMute;

  if (mixerGetControlDetails((HMIXEROBJ)hMixer,
                             &mxcd,
                             MIXER_OBJECTF_HMIXER
                             | MIXER_GETCONTROLDETAILSF_VALUE)
      !=
      MMSYSERR_NOERROR){
    return FALSE;
  }

  *value = mxcdMute.fValue;
  return TRUE;

}

BOOL mmSetMuteValue(DWORD id, char todo) {

  MIXERCONTROLDETAILS_BOOLEAN mxcdMute = { (LONG)todo };
  MIXERCONTROLDETAILS mxcd;
  mxcd.cbStruct = sizeof(MIXERCONTROLDETAILS);
  mxcd.dwControlID = id;
  mxcd.cChannels = 1;
  mxcd.cMultipleItems = 0;
  mxcd.cbDetails = sizeof(MIXERCONTROLDETAILS_BOOLEAN);
  mxcd.paDetails = &mxcdMute;

  if (mixerSetControlDetails((HMIXEROBJ)hMixer,
                             &mxcd,
                             MIXER_OBJECTF_HMIXER
                             | MIXER_SETCONTROLDETAILSF_VALUE)
      !=
      MMSYSERR_NOERROR) {
    return FALSE;
  }

  return TRUE;

}

int main(int argc, char* argv[]) {

  char todo = -1; //-1 is toggle, 1 is mute, 0 is no mute

  if(argc >= 3) {
    usage();
  } else if(argc == 2) {

    switch(argv[1][0]) {
      case '0':
        if (argv[1][1] == 0) {
          todo = 0;
          break;
        }
      case '1':
        if (argv[1][1] == 0) {
          todo = 1;
          break;
        }
      default:
        usage();
    }

  }

  DWORD controlID;
  if(mmInit() && mmGetMuteControl(&controlID)) {

    LONG currValue;
    mmGetMuteValue(controlID, &currValue);

    if (todo == -1) //need to know what to do
      todo = 1 - (char)currValue;
    if (todo != (char)currValue)
      mmSetMuteValue(controlID, todo);
    fprintf(stderr,
            todo == 1 ? "Mute ON\n" : "Mute OFF\n");

    mmClose();

  }

  return todo;
}