First we need to create to files winamp.cpp and winamp.h
paste this in winamp.cpp Code:

#include <windows.h>
#include "Winamp.h"
#include "cvar.h"
#include "client.h"
#include "console.h"
#include "interpreter.h"
#include <assert.h>
#define WA_GETTRACKLENGTH 105
#define maxbars 20
char bars[maxbars+5];
//================================================================================
Winamp winamp;
//================================================================================
Winamp::Winamp(void)
{
  hwnd=0;
  crossfade=1.0f;
  paused=0;
  playing=1;
}

//================================================================================
void Winamp::setfracvol(void)
{
  float f = crossfade;
  f = f*f;

  int wvol = cvar.wa_vol1 + (DWORD)(f*(cvar.wa_vol2-cvar.wa_vol1));
   
  assert(hwnd);
  PostMessage(hwnd,WM_USER,wvol,122); // setvolume

  float hlvol = cvar.hl_vol1 + (cvar.hl_vol2-cvar.hl_vol1)*(1.0f-f);
  char buf[64]; sprintf(buf,"volume %f",hlvol);
  gEngfuncs.pfnClientCmd(buf);
}

//================================================================================
void Winamp::fadein(void)
{
    if(crossfade==1.0 || !playing) return;
  if(paused) command("pause");//unpause

  crossfade += cvar.wa_fadeinspeed;
  if(crossfade>1.0f) crossfade = 1.0f;

  setfracvol();
}

//================================================================================
void Winamp::fadeout(void)
{
  if(crossfade==0.0f)
  {
      if(!paused)
      {
        if(!cvar.wa_vol1)
        {
            command("pause");// pause
            command("back" );
        }
      }
      return;
  }

  crossfade -= cvar.wa_fadeoutspeed;
  if(crossfade<0) crossfade = 0;


  setfracvol();
}

//================================================================================
void Winamp::frame(void)
{
  if(searchForWindowEventCounter.get()) { searchWindow(); }

  if(hwnd)
  {
      int n = fadeEventCounter.get();
      if(cvar.wa_autovolume)
      {
        for(int i=0;i<n;i++)
        {
            if(cvar.alive_method==1) 
            {
              fadein();
            }
            else
            {
              fadeout();
            }
        }
      }

      if(titleUpdateEventCounter.get()&&playing) { updateTitle(); }
  }
  else
  {
      title.erase();
  }
}

//================================================================================
void Winamp::searchWindow()
{
  HWND old = hwnd;
  hwnd = FindWindow("Winamp v1.x",NULL);
   
  if(old!=hwnd)
  {
      if(hwnd)
      {
        if(!old) { gConsole.echo("-]| Winamp Controls Found |[-"); }
        else    { gConsole.echo("-]| Found Another Winamp Instance |[-");    }
      }
      else    { gConsole.echo("WinAmp window lost."              ); }
  }
}

//================================================================================
void Winamp::updateTitle()
{
  assert(hwnd);
  char this_title[2048],*p;
  int success =  GetWindowText(hwnd,this_title,sizeof(this_title));
 
  if(!success) { title.erase(); return; }
  p = this_title+strlen(this_title);//-8;
  while (p >= this_title)
  {
      if (!strnicmp(p,"- Winamp",8)) break;
      p--;
  }
  if (p >= this_title) p--;
  while (p>=this_title && *p==' ') p--;
  *++p=0;

  char* pos = this_title;
  while(*pos){ if(*pos<' '||*pos>127){ *pos='-';} ++pos;}

  if(title!=this_title && winamp.title.size()) // did the title change?
  {
      char say[1200];
      char* formatA = "#say -|[: Winamp :][: Listening To: %s :]|-"; // has hours say to HL

      sprintf(say,formatA,this_title);

      if (cvar.wa_saytitle)
      {
        cmd.exec(say); // send to HL
      }
  }
  title = this_title;
}

//================================================================================
void Winamp::command(const string& subcommand, const string& arg1, const string& arg2, const string& arg3)
{
  // hwnd independent:
  if(0) {}
  else if (subcommand=="1") { cvar.wa_active=1; }
  else if (subcommand=="0") { cvar.wa_active=0; }
   
  if(!cvar.wa_active)      { gConsole.echo("type \"winamp 1\" first!"); return; }
  if(!hwnd)                { gConsole.echo("-]| Winamp Needs To Be Running! |[-"); return; }

  // hwnd dependent:
  #define CHECK_COMMAND(name,number)  } else if(subcommand==name) { PostMessage(hwnd,WM_COMMAND,number,0);
  if(0){
  CHECK_COMMAND("play"  ,40045) paused=false; playing=true;
  CHECK_COMMAND("pause"  ,40046) if(playing) paused=!paused;
  CHECK_COMMAND("stop"  ,40047) paused=false; playing=false;title.erase();
  CHECK_COMMAND("forward",40148)
  CHECK_COMMAND("back"  ,40144)
  CHECK_COMMAND("next"  ,40048)
  CHECK_COMMAND("prev"  ,40044)
  CHECK_COMMAND("close"  ,40001)
  }

  long trackpos = PostMessage(hwnd, WM_USER, 0, WA_GETTRACKLENGTH);
  long tracklen = PostMessage(hwnd, WM_USER, 1, WA_GETTRACKLENGTH);

  if(tracklen){
      memset(bars,'=',maxbars+6);
      bars[0] = '[';
      bars[maxbars+1] = ']';
      memset(bars+maxbars+2,0,3);
      for(int i = 1; i <= (((trackpos/1000.0f)/tracklen)*maxbars); i++)
        bars = '+';
  }else{
      memset(bars,'x',maxbars+6);
      bars[0] = '[';
      bars[maxbars+1] = ']';
      memset(bars+maxbars+2,0,3);
  }
   

  if(0) {}
  else if(subcommand=="repeat" ) { PostMessage(hwnd,WM_USER,atoi(arg1.c_str()),253); }
  else if(subcommand=="shuffle") { PostMessage(hwnd,WM_USER,atoi(arg1.c_str()),252); }
  else if(subcommand=="volume" ) { PostMessage(hwnd,WM_USER,atoi(arg1.c_str()),122); }

}

and this to winamp.h Code:

#pragma once
#include <string>
using namespace std;
#include "timehandling.h"

//================================================================================
class Winamp
{
public:
  void updateTitle();
  void play ();
  void frame();
  bool playing;
  void command(const string& subcommand, const string& arg1="", const string& arg2="", const string& arg3="");
  string title;

protected:
  HWND  hwnd;

  // volume stuff
  float crossfade; // 0..1
  void searchWindow();
  void fadein();
  void fadeout();
  void setfracvol();
  void pause();
  bool paused;

  EventCounter<0.1> fadeEventCounter;            // fade one tick up/down every 0.1 seconds
  EventCounter<10>  searchForWindowEventCounter;  // search for winamp window every 10 seconds
  EventCounter<2>  titleUpdateEventCounter;      // update title every 2 seconds

public:
  Winamp();
};


extern Winamp winamp;

now client.cpp
add this to your includes Code:

#include "winamp.h"

then find this Code:

void hudDrawInfoTexts

somewhere in body add Code:

if (cvar.wa_title && winamp.title.size())
  {   
      int wa_y = displayCenterY*2-180-54;
      ColorEntry* clr=colorList.get(8);
      DrawHudString(5,wa_y,0,0,255, winamp.title.c_str() );
  }

next in Code:

int HUD_Redraw

under Code:

hudDrawInfoTexts();

add this Code:

if (cvar.wa_active)  { winamp.frame        (); }

next anywhere in client.cpp add this: Code:

//===================================================================================
void func_wa_say()
{
  char tmp[128];
  sprintf(tmp,"say -|[: Winamp :][: Listening To: %s :]|-",winamp.title.c_str());
  gEngfuncs.pfnClientCmd(tmp);
}
//===================================================================================
void func_play(){ sndPlaySound(getOgcDirFile(cmd.argC(1)).c_str(), SND_ASYNC); }

//========================================================================================
void func_turn()
{
  double degrees = cmd.argF(1);
  mainViewAngles[1] += degrees;
  if( mainViewAngles[1]>360.0 ) mainViewAngles[1] -= 360.0;
  gEngfuncs.SetViewAngles(mainViewAngles);

}
void func_winamp() { winamp.command(cmd.argS(1),cmd.argS(2),cmd.argS(3),cmd.argS(4)); }

void func_user() { gConsole.echo("User: DAG"); }
//===================================================================================
void func_entinfo()
{
  int index = cmd.argI(1);
  Con_Echo("info:" );
  Con_Echo("name=%s pvs=%d alive=%d team=%d", vPlayers[index].entinfo.name, vPlayers[index].getPVS(), vPlayers[index].getAlive(),vPlayers[index].team);
  Con_Echo("solid: %d me: alive=%d team=%d",vPlayers[index].getEnt()->curstate.solid,me.alive,me.team);   
}
//===================================================================================

next under Code:

Init_Command_Interpreter

add commands: Code:

REGISTER_COMMAND(user      )
REGISTER_COMMAND(winamp  )
REGISTER_COMMAND(play      )
REGISTER_COMMAND(turn      )
REGISTER_COMMAND(wa_say  )

cvar.cpp Code:

REGISTER_CVAR_FLOAT( hl_vol1  ,0.2)
REGISTER_CVAR_FLOAT( hl_vol2  ,0.7)
REGISTER_CVAR_FLOAT( wa_fadeinspeed  ,0.0)
REGISTER_CVAR_FLOAT( wa_fadeoutspeed  ,0.0)
REGISTER_CVAR_FLOAT( wa_vol1  ,0.0)
REGISTER_CVAR_FLOAT( wa_vol2  ,1.0)

REGISTER_CVAR_INT( wa_active ,1)
REGISTER_CVAR_INT( wa_title  ,1)
REGISTER_CVAR_INT( wa_saytitle ,0)
REGISTER_CVAR_INT( wa_autovolume ,0)

cvar.h Code:

float hl_vol1;
float hl_vol2;
float wa_fadeinspeed;
float wa_fadeoutspeed;
float wa_vol1;
float wa_vol2;

int wa_active;
int wa_title;
int wa_saytitle;
int wa_autovolume;

add this to your hack menu
" " " Winamp " {
" " "> Play" "winamp play"
" " "[] Stop" "winamp stop"
" " "|| Pause" "winamp pause"
" " ">> Fast Forward" "winamp forward"
" " "<< Rewind" "winamp back"
" " "|> Next" "winamp next"
" " "<| Previous" "winamp prev"
" " "|X| Close" "winamp close"
" " "Draw Title" "wa_title change"
" " "Say Title Now" "wa_say"
" " ">Volume" {
" " "Volume: Automatic" "wa_autovolume 1;"
" " "Volume: ********" "wa_autovolume 0;winamp volume 255;"
" " "Volume: *******" "wa_autovolume 0;winamp volume 224;"
" " "Volume: ******" "wa_autovolume 0;winamp volume 192;"
" " "Volume: *****" "wa_autovolume 0;winamp volume 160;"
" " "Volume: ****" "wa_autovolume 0;winamp volume 128;"
" " "Volume: ***" "wa_autovolume 0;winamp volume 96;"
" " "Volume: **" "wa_autovolume 0;winamp volume 64;"
" " "Volume: *" "wa_autovolume 0;winamp volume 32;"
}

Credits: OGC G-D me for making it 0 errors

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