From 9fa822847de1c2d64b8e2186e9ec74277f28cc16 Mon Sep 17 00:00:00 2001
From: Simon Howard
Date: Thu, 4 Aug 2005 21:48:32 +0000
Subject: Turn on compiler optimisation and warning options Add SDL_mixer sound
 code

Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 39
---
 src/i_sound.c | 781 +++++++---------------------------------------------------
 1 file changed, 83 insertions(+), 698 deletions(-)

(limited to 'src/i_sound.c')

diff --git a/src/i_sound.c b/src/i_sound.c
index 82019c0d..ce13778b 100644
--- a/src/i_sound.c
+++ b/src/i_sound.c
@@ -1,7 +1,7 @@
 // Emacs style mode select   -*- C++ -*- 
 //-----------------------------------------------------------------------------
 //
-// $Id: i_sound.c 23 2005-07-23 21:32:47Z fraggle $
+// $Id: i_sound.c 39 2005-08-04 21:48:32Z fraggle $
 //
 // Copyright(C) 1993-1996 Id Software, Inc.
 // Copyright(C) 2005 Simon Howard
@@ -22,6 +22,10 @@
 // 02111-1307, USA.
 //
 // $Log$
+// Revision 1.6  2005/08/04 21:48:32  fraggle
+// Turn on compiler optimisation and warning options
+// Add SDL_mixer sound code
+//
 // Revision 1.5  2005/07/23 21:32:47  fraggle
 // Add missing errno.h, fix crash on startup when no IWAD present
 //
@@ -44,28 +48,12 @@
 //-----------------------------------------------------------------------------
 
 static const char
-rcsid[] = "$Id: i_sound.c 23 2005-07-23 21:32:47Z fraggle $";
+rcsid[] = "$Id: i_sound.c 39 2005-08-04 21:48:32Z fraggle $";
 
 #include <stdio.h>
 #include <stdlib.h>
-#include <stdarg.h>
-#include <errno.h>
-
-#include <math.h>
-
-#include <sys/time.h>
-#include <sys/types.h>
-
-#include <fcntl.h>
-#include <unistd.h>
-#include <sys/ioctl.h>
-
-// Linux voxware output.
-#include <linux/soundcard.h>
-
-// Timer stuff. Experimental.
-#include <time.h>
-#include <signal.h>
+#include <SDL.h>
+#include <SDL_mixer.h>
 
 #include "z_zone.h"
 
@@ -73,332 +61,78 @@ rcsid[] = "$Id: i_sound.c 23 2005-07-23 21:32:47Z fraggle $";
 #include "i_sound.h"
 #include "m_argv.h"
 #include "m_misc.h"
+#include "m_swap.h"
 #include "w_wad.h"
 
 #include "doomdef.h"
 
-// UNIX hack, to be removed.
-#ifdef SNDSERV
-// Separate sound server process.
-FILE*	sndserver=0;
-char*	sndserver_filename = "./sndserver ";
-#elif SNDINTR
-
-// Update all 30 millisecs, approx. 30fps synchronized.
-// Linux resolution is allegedly 10 millisecs,
-//  scale is microseconds.
-#define SOUND_INTERVAL     500
-
-// Get the interrupt. Set duration in millisecs.
-int I_SoundSetTimer( int duration_of_tick );
-void I_SoundDelTimer( void );
-#else
-// None?
-#endif
-
-
-// A quick hack to establish a protocol between
-// synchronous mix buffer updates and asynchronous
-// audio writes. Probably redundant with gametic.
-static int flag = 0;
-
-// The number of internal mixing channels,
-//  the samples calculated for each mixing step,
-//  the size of the 16bit, 2 hardware channel (stereo)
-//  mixing buffer, and the samplerate of the raw data.
-
-
-// Needed for calling the actual sound output.
-#define SAMPLECOUNT		512
 #define NUM_CHANNELS		8
-// It is 2 for 16bit, and 2 for two channels.
-#define BUFMUL                  4
-#define MIXBUFFERSIZE		(SAMPLECOUNT*BUFMUL)
-
-#define SAMPLERATE		11025	// Hz
-#define SAMPLESIZE		2   	// 16bit
-
-// The actual lengths of all sound effects.
-int 		lengths[NUMSFX];
-
-// The actual output device.
-int	audio_fd;
-
-// The global mixing buffer.
-// Basically, samples from all active internal channels
-//  are modifed and added, and stored in the buffer
-//  that is submitted to the audio device.
-signed short	mixbuffer[MIXBUFFERSIZE];
-
-
-// The channel step amount...
-unsigned int	channelstep[NUM_CHANNELS];
-// ... and a 0.16 bit remainder of last step.
-unsigned int	channelstepremainder[NUM_CHANNELS];
-
-
-// The channel data pointers, start and end.
-unsigned char*	channels[NUM_CHANNELS];
-unsigned char*	channelsend[NUM_CHANNELS];
-
-
-// Time/gametic that the channel started playing,
-//  used to determine oldest, which automatically
-//  has lowest priority.
-// In case number of active sounds exceeds
-//  available channels.
-int		channelstart[NUM_CHANNELS];
-
-// The sound in channel handles,
-//  determined on registration,
-//  might be used to unregister/stop/modify,
-//  currently unused.
-int 		channelhandles[NUM_CHANNELS];
-
-// SFX id of the playing sound effect.
-// Used to catch duplicates (like chainsaw).
-int		channelids[NUM_CHANNELS];			
-
-// Volume lookups.
-int		vol_lookup[128*256];
-
-// Hardware left and right channel volume lookup.
-int*		channelleftvol_lookup[NUM_CHANNELS];
-int*		channelrightvol_lookup[NUM_CHANNELS];
-
 
+static int sound_initialised = 0;
+static Mix_Chunk sound_chunks[NUMSFX];
 
+static byte *expand_sound_data(byte *data, int samplerate, int length)
+{
+    byte *result = data;
+    int i;
 
-//
-// Safe ioctl, convenience.
-//
-void
-myioctl
-( int	fd,
-  int	command,
-  int*	arg )
-{   
-    int		rc;
-    extern int	errno;
-    
-    rc = ioctl(fd, command, arg);  
-    if (rc < 0)
+    if (samplerate == 11025)
     {
-	fprintf(stderr, "ioctl(dsp,%d,arg) failed\n", command);
-	fprintf(stderr, "errno=%d\n", errno);
-	exit(-1);
-    }
-}
-
-
+        // need to expand to 2 channels, and expand 8 bit samples to 16 bits
 
+        result = Z_Malloc(length * 4, PU_STATIC, NULL);
 
+        for (i=0; i<length; ++i)
+        {
+            result[i * 4] = result[i * 4 + 1] 
+              = result[i * 4 + 2] = result[i * 4 + 3] = data[i];
+        }
+    }
+    else if (samplerate == 22050)
+    {
+        // need to expand to 2 channels (sample rate is already correct)
 
-//
-// This function loads the sound data from the WAD lump,
-//  for single sound.
-//
-void*
-getsfx
-( char*         sfxname,
-  int*          len )
-{
-    unsigned char*      sfx;
-    unsigned char*      paddedsfx;
-    int                 i;
-    int                 size;
-    int                 paddedsize;
-    char                name[20];
-    int                 sfxlump;
+        result = Z_Malloc(length * 2, PU_STATIC, NULL);
 
-    
-    // Get the sound data from the WAD, allocate lump
-    //  in zone memory.
-    sprintf(name, "ds%s", sfxname);
-
-    // Now, there is a severe problem with the
-    //  sound handling, in it is not (yet/anymore)
-    //  gamemode aware. That means, sounds from
-    //  DOOM II will be requested even with DOOM
-    //  shareware.
-    // The sound list is wired into sounds.c,
-    //  which sets the external variable.
-    // I do not do runtime patches to that
-    //  variable. Instead, we will use a
-    //  default sound for replacement.
-    if ( W_CheckNumForName(name) == -1 )
-      sfxlump = W_GetNumForName("dspistol");
+        for (i=0; i<length / 2; ++i)
+        {
+            result[i * 4] = result[i * 4 + 2] = data[i * 2];
+            result[i * 4 + 1] = result[i * 4 + 3] = data[i * 2 + 1];
+        }
+    }
     else
-      sfxlump = W_GetNumForName(name);
-    
-    size = W_LumpLength( sfxlump );
-
-    // Debug.
-    // fprintf( stderr, "." );
-    //fprintf( stderr, " -loading  %s (lump %d, %d bytes)\n",
-    //	     sfxname, sfxlump, size );
-    //fflush( stderr );
-    
-    sfx = (unsigned char*)W_CacheLumpNum( sfxlump, PU_STATIC );
-
-    // Pads the sound effect out to the mixing buffer size.
-    // The original realloc would interfere with zone memory.
-    paddedsize = ((size-8 + (SAMPLECOUNT-1)) / SAMPLECOUNT) * SAMPLECOUNT;
-
-    // Allocate from zone memory.
-    paddedsfx = (unsigned char*)Z_Malloc( paddedsize+8, PU_STATIC, 0 );
-    // ddt: (unsigned char *) realloc(sfx, paddedsize+8);
-    // This should interfere with zone memory handling,
-    //  which does not kick in in the soundserver.
-
-    // Now copy and pad.
-    memcpy(  paddedsfx, sfx, size );
-    for (i=size ; i<paddedsize+8 ; i++)
-        paddedsfx[i] = 128;
-
-    // Remove the cached lump.
-    Z_Free( sfx );
-    
-    // Preserve padded length.
-    *len = paddedsize;
+    {
+        I_Error("Unsupported sample rate %i", samplerate);
+    }
 
-    // Return allocated padded data.
-    return (void *) (paddedsfx + 8);
+    return result;
 }
 
-
-
-
-
-//
-// This function adds a sound to the
-//  list of currently active sounds,
-//  which is maintained as a given number
-//  (eight, usually) of internal channels.
-// Returns a handle.
-//
-int
-addsfx
-( int		sfxid,
-  int		volume,
-  int		step,
-  int		seperation )
+static Mix_Chunk *getsfx(int sound)
 {
-    static unsigned short	handlenums = 0;
- 
-    int		i;
-    int		rc = -1;
-    
-    int		oldest = gametic;
-    int		oldestnum = 0;
-    int		slot;
-
-    int		rightvol;
-    int		leftvol;
-
-    // Chainsaw troubles.
-    // Play these sound effects only one at a time.
-    if ( sfxid == sfx_sawup
-	 || sfxid == sfx_sawidl
-	 || sfxid == sfx_sawful
-	 || sfxid == sfx_sawhit
-	 || sfxid == sfx_stnmov
-	 || sfxid == sfx_pistol	 )
-    {
-	// Loop all channels, check.
-	for (i=0 ; i<NUM_CHANNELS ; i++)
-	{
-	    // Active, and using the same SFX?
-	    if ( (channels[i])
-		 && (channelids[i] == sfxid) )
-	    {
-		// Reset.
-		channels[i] = 0;
-		// We are sure that iff,
-		//  there will only be one.
-		break;
-	    }
-	}
-    }
-
-    // Loop all channels to find oldest SFX.
-    for (i=0; (i<NUM_CHANNELS) && (channels[i]); i++)
+    if (sound_chunks[sound].abuf == NULL)
     {
-	if (channelstart[i] < oldest)
-	{
-	    oldestnum = i;
-	    oldest = channelstart[i];
-	}
-    }
+        int lumpnum;
+        int samplerate;
+        int length;
+        byte *data;
 
-    // Tales from the cryptic.
-    // If we found a channel, fine.
-    // If not, we simply overwrite the first one, 0.
-    // Probably only happens at startup.
-    if (i == NUM_CHANNELS)
-	slot = oldestnum;
-    else
-	slot = i;
-
-    // Okay, in the less recent channel,
-    //  we will handle the new SFX.
-    // Set pointer to raw data.
-    channels[slot] = (unsigned char *) S_sfx[sfxid].data;
-    // Set pointer to end of raw data.
-    channelsend[slot] = channels[slot] + lengths[sfxid];
-
-    // Reset current handle number, limited to 0..100.
-    if (!handlenums)
-	handlenums = 100;
-
-    // Assign current handle number.
-    // Preserved so sounds could be stopped (unused).
-    channelhandles[slot] = rc = handlenums++;
-
-    // Set stepping???
-    // Kinda getting the impression this is never used.
-    channelstep[slot] = step;
-    // ???
-    channelstepremainder[slot] = 0;
-    // Should be gametic, I presume.
-    channelstart[slot] = gametic;
-
-    // Separation, that is, orientation/stereo.
-    //  range is: 1 - 256
-    seperation += 1;
-
-    // Per left/right channel.
-    //  x^2 seperation,
-    //  adjust volume properly.
-    leftvol =
-	volume - ((volume*seperation*seperation) >> 16); ///(256*256);
-    seperation = seperation - 257;
-    rightvol =
-	volume - ((volume*seperation*seperation) >> 16);	
-
-    // Sanity check, clamp volume.
-    if (rightvol < 0 || rightvol > 127)
-	I_Error("rightvol out of bounds");
-    
-    if (leftvol < 0 || leftvol > 127)
-	I_Error("leftvol out of bounds");
-    
-    // Get the proper lookup table piece
-    //  for this volume level???
-    channelleftvol_lookup[slot] = &vol_lookup[leftvol*256];
-    channelrightvol_lookup[slot] = &vol_lookup[rightvol*256];
-
-    // Preserve sound SFX id,
-    //  e.g. for avoiding duplicates of chainsaw.
-    channelids[slot] = sfxid;
-
-    // You tell me.
-    return rc;
-}
+        // need to load the sound
 
+        lumpnum = I_GetSfxLumpNum(&S_sfx[sound]);
+        data = W_CacheLumpNum(lumpnum, PU_STATIC);
 
+        samplerate = (data[3] << 8) | data[2];
+        length = (data[5] << 8) | data[4];
 
+        sound_chunks[sound].allocated = 1;
+        sound_chunks[sound].abuf = expand_sound_data(data + 8, samplerate, length);
+        sound_chunks[sound].alen = (length * 2 * 22050) / samplerate;
+        sound_chunks[sound].volume = 128;
+    }
 
+    return &sound_chunks[sound];
+}
 
 //
 // SFX API
@@ -411,24 +145,6 @@ addsfx
 //
 void I_SetChannels()
 {
-  // Init internal lookups (raw data, mixing buffer, channels).
-  // This function sets up internal lookups used during
-  //  the mixing process. 
-  int		i;
-  int		j;
-    
-  // Okay, reset internal mixing channels to zero.
-  /*for (i=0; i<NUM_CHANNELS; i++)
-  {
-    channels[i] = 0;
-  }*/
-
-  // Generates volume lookup tables
-  //  which also turn the unsigned samples
-  //  into signed samples.
-  for (i=0 ; i<128 ; i++)
-    for (j=0 ; j<256 ; j++)
-      vol_lookup[i*256+j] = (i*(j-128)*256)/127;
 }	
 
  
@@ -483,47 +199,27 @@ I_StartSound
   int		pitch,
   int		priority )
 {
+    Mix_Chunk *chunk = getsfx(id);
+    int channel;
 
-  // UNUSED
-  priority = 0;
-  
-#ifdef SNDSERV 
-    if (sndserver)
-    {
-	fprintf(sndserver, "p%2.2x%2.2x%2.2x%2.2x\n", id, pitch, vol, sep);
-	fflush(sndserver);
-    }
-    // warning: control reaches end of non-void function.
-    return id;
-#else
-    // Debug.
-    //fprintf( stderr, "starting sound %d", id );
-    
+    channel = Mix_PlayChannelTimed(-1, chunk, 0, -1);
 
-    // fprintf( stderr, "/handle is %d\n", id );
-    
-    return id;
-#endif
+    I_UpdateSoundParams(channel, vol, sep, pitch);
+
+    return channel;
 }
 
 
 
 void I_StopSound (int handle)
 {
-  // You need the handle returned by StartSound.
-  // Would be looping all channels,
-  //  tracking down the handle,
-  //  an setting the channel to zero.
-  
-  // UNUSED.
-  handle = 0;
+    Mix_HaltChannel(handle);
 }
 
 
 int I_SoundIsPlaying(int handle)
 {
-    // Ouch.
-    return gametic < handle;
+    return Mix_Playing(handle);
 }
 
 
@@ -544,119 +240,6 @@ int I_SoundIsPlaying(int handle)
 //
 void I_UpdateSound( void )
 {
-#ifdef SNDINTR
-  // Debug. Count buffer misses with interrupt.
-  static int misses = 0;
-#endif
-
-  
-  // Mix current sound data.
-  // Data, from raw sound, for right and left.
-  register unsigned int	sample;
-  register int		dl;
-  register int		dr;
-  
-  // Pointers in global mixbuffer, left, right, end.
-  signed short*		leftout;
-  signed short*		rightout;
-  signed short*		leftend;
-  // Step in mixbuffer, left and right, thus two.
-  int				step;
-
-  // Mixing channel index.
-  int				chan;
-    
-    // Left and right channel
-    //  are in global mixbuffer, alternating.
-    leftout = mixbuffer;
-    rightout = mixbuffer+1;
-    step = 2;
-
-    // Determine end, for left channel only
-    //  (right channel is implicit).
-    leftend = mixbuffer + SAMPLECOUNT*step;
-
-    // Mix sounds into the mixing buffer.
-    // Loop over step*SAMPLECOUNT,
-    //  that is 512 values for two channels.
-    while (leftout != leftend)
-    {
-	// Reset left/right value. 
-	dl = 0;
-	dr = 0;
-
-	// Love thy L2 chache - made this a loop.
-	// Now more channels could be set at compile time
-	//  as well. Thus loop those  channels.
-	for ( chan = 0; chan < NUM_CHANNELS; chan++ )
-	{
-	    // Check channel, if active.
-	    if (channels[ chan ])
-	    {
-		// Get the raw data from the channel. 
-		sample = *channels[ chan ];
-		// Add left and right part
-		//  for this channel (sound)
-		//  to the current data.
-		// Adjust volume accordingly.
-		dl += channelleftvol_lookup[ chan ][sample];
-		dr += channelrightvol_lookup[ chan ][sample];
-		// Increment index ???
-		channelstepremainder[ chan ] += channelstep[ chan ];
-		// MSB is next sample???
-		channels[ chan ] += channelstepremainder[ chan ] >> 16;
-		// Limit to LSB???
-		channelstepremainder[ chan ] &= 65536-1;
-
-		// Check whether we are done.
-		if (channels[ chan ] >= channelsend[ chan ])
-		    channels[ chan ] = 0;
-	    }
-	}
-	
-	// Clamp to range. Left hardware channel.
-	// Has been char instead of short.
-	// if (dl > 127) *leftout = 127;
-	// else if (dl < -128) *leftout = -128;
-	// else *leftout = dl;
-
-	if (dl > 0x7fff)
-	    *leftout = 0x7fff;
-	else if (dl < -0x8000)
-	    *leftout = -0x8000;
-	else
-	    *leftout = dl;
-
-	// Same for right hardware channel.
-	if (dr > 0x7fff)
-	    *rightout = 0x7fff;
-	else if (dr < -0x8000)
-	    *rightout = -0x8000;
-	else
-	    *rightout = dr;
-
-	// Increment current pointers in mixbuffer.
-	leftout += step;
-	rightout += step;
-    }
-
-#ifdef SNDINTR
-    // Debug check.
-    if ( flag )
-    {
-      misses += flag;
-      flag = 0;
-    }
-    
-    if ( misses > 10 )
-    {
-      fprintf( stderr, "I_SoundUpdate: missed 10 buffer writes\n");
-      misses = 0;
-    }
-    
-    // Increment flag for update.
-    flag++;
-#endif
 }
 
 
@@ -671,8 +254,6 @@ void I_UpdateSound( void )
 void
 I_SubmitSound(void)
 {
-  // Write it to DSP device.
-  write(audio_fd, mixbuffer, SAMPLECOUNT*BUFMUL);
 }
 
 
@@ -684,13 +265,9 @@ I_UpdateSoundParams
   int	sep,
   int	pitch)
 {
-  // I fail too see that this is used.
-  // Would be using the handle to identify
-  //  on which channel the sound might be active,
-  //  and resetting the channel parameters.
-
-  // UNUSED.
-  handle = vol = sep = pitch = 0;
+    Mix_SetPanning(handle, 
+                   ((254 - sep) * vol) / 8, 
+                   ((sep) * vol) / 8);
 }
 
 
@@ -698,41 +275,11 @@ I_UpdateSoundParams
 
 void I_ShutdownSound(void)
 {    
-#ifdef SNDSERV
-  if (sndserver)
-  {
-    // Send a "quit" command.
-    fprintf(sndserver, "q\n");
-    fflush(sndserver);
-  }
-#else
-  // Wait till all pending sounds are finished.
-  int done = 0;
-  int i;
-  
-
-  // FIXME (below).
-  fprintf( stderr, "I_ShutdownSound: NOT finishing pending sounds\n");
-  fflush( stderr );
-  
-  while ( !done )
-  {
-    for( i=0 ; i<8 && !channels[i] ; i++);
-    
-    // FIXME. No proper channel output.
-    //if (i==8)
-    done=1;
-  }
-#ifdef SNDINTR
-  I_SoundDelTimer();
-#endif
-  
-  // Cleaning up -releasing the DSP device.
-  close ( audio_fd );
-#endif
+    if (!sound_initialised)
+        return;
 
-  // Done.
-  return;
+    Mix_CloseAudio();
+    SDL_QuitSubSystem(SDL_INIT_AUDIO);
 }
 
 
@@ -743,91 +290,22 @@ void I_ShutdownSound(void)
 void
 I_InitSound()
 { 
-#ifdef SNDSERV
-  char buffer[256];
-  
-  if (getenv("DOOMWADDIR"))
-    sprintf(buffer, "%s/%s",
-	    getenv("DOOMWADDIR"),
-	    sndserver_filename);
-  else
-    sprintf(buffer, "%s", sndserver_filename);
-  
-  // start sound process
-  if ( !access(buffer, X_OK) )
-  {
-    strcat(buffer, " -quiet");
-    sndserver = popen(buffer, "w");
-  }
-  else
-    fprintf(stderr, "Could not start sound server [%s]\n", buffer);
-#else
-    
-  int i;
-  
-#ifdef SNDINTR
-  fprintf( stderr, "I_SoundSetTimer: %d microsecs\n", SOUND_INTERVAL );
-  I_SoundSetTimer( SOUND_INTERVAL );
-#endif
-    
-  // Secure and configure sound device first.
-  fprintf( stderr, "I_InitSound: ");
-  
-  audio_fd = open("/dev/dsp", O_WRONLY);
-  if (audio_fd<0)
-    fprintf(stderr, "Could not open /dev/dsp\n");
-  
-                     
-  i = 11 | (2<<16);                                           
-  myioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &i);
-  myioctl(audio_fd, SNDCTL_DSP_RESET, 0);
-  
-  i=SAMPLERATE;
-  
-  myioctl(audio_fd, SNDCTL_DSP_SPEED, &i);
-  
-  i=1;
-  myioctl(audio_fd, SNDCTL_DSP_STEREO, &i);
-  
-  myioctl(audio_fd, SNDCTL_DSP_GETFMTS, &i);
-  
-  if (i&=AFMT_S16_LE)    
-    myioctl(audio_fd, SNDCTL_DSP_SETFMT, &i);
-  else
-    fprintf(stderr, "Could not play signed 16 data\n");
-
-  fprintf(stderr, " configured audio device\n" );
-
-    
-  // Initialize external data (all sounds) at start, keep static.
-  fprintf( stderr, "I_InitSound: ");
-  
-  for (i=1 ; i<NUMSFX ; i++)
-  { 
-    // Alias? Example is the chaingun sound linked to pistol.
-    if (!S_sfx[i].link)
+    if (SDL_Init(SDL_INIT_AUDIO) < 0)
     {
-      // Load data from WAD file.
-      S_sfx[i].data = getsfx( S_sfx[i].name, &lengths[i] );
-    }	
-    else
-    {
-      // Previously loaded already?
-      S_sfx[i].data = S_sfx[i].link->data;
-      lengths[i] = lengths[(S_sfx[i].link - S_sfx)/sizeof(sfxinfo_t)];
+        printf("Unable to set up sound.\n");
+        return;
     }
-  }
 
-  fprintf( stderr, " pre-cached all sound data\n");
-  
-  // Now initialize mixbuffer with zero.
-  for ( i = 0; i< MIXBUFFERSIZE; i++ )
-    mixbuffer[i] = 0;
-  
-  // Finished initialization.
-  fprintf(stderr, "I_InitSound: sound module ready\n");
+    if (Mix_OpenAudio(22050, AUDIO_U8, 2, 1024) < 0)
+    {
+        printf("Error initialising SDL_mixer: %s\n", SDL_GetError());
+    }
     
-#endif
+    sound_initialised = 1;
+
+    SDL_PauseAudio(0);
+
+    printf("sound started.\n");
 }
 
 
@@ -896,96 +374,3 @@ int I_QrySongPlaying(int handle)
 
 
 
-//
-// Experimental stuff.
-// A Linux timer interrupt, for asynchronous
-//  sound output.
-// I ripped this out of the Timer class in
-//  our Difference Engine, including a few
-//  SUN remains...
-//  
-#ifdef sun
-    typedef     sigset_t        tSigSet;
-#else    
-    typedef     int             tSigSet;
-#endif
-
-
-// We might use SIGVTALRM and ITIMER_VIRTUAL, if the process
-//  time independend timer happens to get lost due to heavy load.
-// SIGALRM and ITIMER_REAL doesn't really work well.
-// There are issues with profiling as well.
-static int /*__itimer_which*/  itimer = ITIMER_REAL;
-
-static int sig = SIGALRM;
-
-// Interrupt handler.
-void I_HandleSoundTimer( int ignore )
-{
-  // Debug.
-  //fprintf( stderr, "%c", '+' ); fflush( stderr );
-  
-  // Feed sound device if necesary.
-  if ( flag )
-  {
-    // See I_SubmitSound().
-    // Write it to DSP device.
-    write(audio_fd, mixbuffer, SAMPLECOUNT*BUFMUL);
-
-    // Reset flag counter.
-    flag = 0;
-  }
-  else
-    return;
-  
-  // UNUSED, but required.
-  ignore = 0;
-  return;
-}
-
-// Get the interrupt. Set duration in millisecs.
-int I_SoundSetTimer( int duration_of_tick )
-{
-  // Needed for gametick clockwork.
-  struct itimerval    value;
-  struct itimerval    ovalue;
-  struct sigaction    act;
-  struct sigaction    oact;
-
-  int res;
-  
-  // This sets to SA_ONESHOT and SA_NOMASK, thus we can not use it.
-  //     signal( _sig, handle_SIG_TICK );
-  
-  // Now we have to change this attribute for repeated calls.
-  act.sa_handler = I_HandleSoundTimer;
-#ifndef sun    
-  //ac	t.sa_mask = _sig;
-#endif
-  act.sa_flags = SA_RESTART;
-  
-  sigaction( sig, &act, &oact );
-
-  value.it_interval.tv_sec    = 0;
-  value.it_interval.tv_usec   = duration_of_tick;
-  value.it_value.tv_sec       = 0;
-  value.it_value.tv_usec      = duration_of_tick;
-
-  // Error is -1.
-  res = setitimer( itimer, &value, &ovalue );
-
-  // Debug.
-  if ( res == -1 )
-    fprintf( stderr, "I_SoundSetTimer: interrupt n.a.\n");
-  
-  return res;
-}
-
-
-// Remove the interrupt. Set duration to zero.
-void I_SoundDelTimer()
-{
-  // Debug.
-  if ( I_SoundSetTimer( 0 ) == -1)
-    fprintf( stderr, "I_SoundDelTimer: failed to remove interrupt. Doh!\n");
-}
-- 
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