gentoo-overlay/games-fps/quake2-icculus/files/quake2-icculus-0.16.1-alsa.patch

--- src/linux/snd_alsa.c.old
+++ src/linux/snd_alsa.c
@@ -22,13 +22,22 @@
 	$Id: quake2-icculus-0.16.1-alsa.patch,v 1.2 2015/03/27 06:40:34 mr_bones_ Exp $
 */
 
-#define BUFFER_SIZE 4096
+//    quake2-r0.16.1/src/linux/snd_alsa.c 2010-08-29 09:58:50
+//    Alsa Redux Patch
+#define BUFFER_SIZE 16384
 
 #include <alsa/asoundlib.h>
 
 #include "../client/client.h"
 #include "../client/snd_loc.h"
 
+#define AFSize 4 
+static int  snd_inited=0;
+static snd_pcm_t *playback_handle;
+static int AlsaFrames;
+static int AlsaPos;
+
+/*
 #define snd_buf BUFFER_SIZE
 
 static int  snd_inited;
@@ -43,17 +52,58 @@
 cvar_t *snddevice;
 
 static int tryrates[] = { 44100, 22051, 11025, 8000 };
-
+*/
 qboolean SNDDMA_Init (void)
 {
-  int i;
-  int err;
-  int buffersize;
-  int framesize;
-  int format;
+  int confirm;
+  int latency;
+  Com_Printf("Setting up ALSA driver .....\n");
 
   if (snd_inited) { return 1; }
-  
+  int s_khz=(Cvar_Get("s_khz", "22", CVAR_ARCHIVE))->value;
+  if (s_khz <22 ){
+    Com_Printf("Low Performance 11KHz.\n");
+    Cvar_Set("s_mixahead","0.2");
+    dma.speed=11025;
+    AlsaFrames=2048;
+    latency=200000;
+    }else{
+    Com_Printf("High Quality 48KHz.\n");     
+        Cvar_Set("s_mixahead","0.1");      
+     dma.speed=48000;
+    AlsaFrames=4800;
+    latency=110000;}
+
+  dma.channels = 2;
+  dma.samplebits = 16;
+  AlsaPos = 0;
+  playback_handle = NULL;
+      confirm =
+snd_pcm_open(&playback_handle,"default",SND_PCM_STREAM_PLAYBACK,SND_PCM_NONBLOCK);
+      if (confirm < 0) {
+            Com_Printf("ALSA sound error: cannot open device \n"); 
+            return 0;}
+        confirm = snd_pcm_set_params(playback_handle,
+                    SND_PCM_FORMAT_S16_LE,
+                                      SND_PCM_ACCESS_RW_INTERLEAVED,
+                                      dma.channels,
+                                      dma.speed,
+                                      1,//soft resample
+                                      latency);
+     if (confirm < 0){ 
+                Com_Printf("Alsa error: %s\n", snd_strerror(confirm));
+                return 0;}
+    confirm = snd_pcm_prepare(playback_handle);
+        if (confirm  < 0) {
+        Com_Printf("...failed.\n");
+         return 0;}
+
+  int rambuffer = (BUFFER_SIZE+AlsaFrames)*AFSize;
+  dma.buffer=malloc(rambuffer);    
+  dma.samplepos = 0;
+  dma.samples = BUFFER_SIZE*dma.channels;
+  dma.submission_chunk = 16;
+  /*
   sndbits = Cvar_Get("sndbits", "16", CVAR_ARCHIVE);
   sndspeed = Cvar_Get("sndspeed", "0", CVAR_ARCHIVE);
   sndchannels = Cvar_Get("sndchannels", "2", CVAR_ARCHIVE);
@@ -159,7 +209,6 @@
     return 0;
   }
 
-  /*
     buffer_size = snd_pcm_hw_params_get_buffer_size(hw_params);
     frame_size = (snd_pcm_format_physical_width(format)*dma.channels)/8;
     
@@ -172,7 +221,6 @@
     }
     
     snd_buf = buffer_size*frame_size;
-  */
 
   //snd_buf = BUFFER_SIZE;
 
@@ -183,7 +231,7 @@
   dma.samples = snd_buf / (dma.samplebits/8);
   dma.submission_chunk = 1;
   dma.buffer = (char *)buffer;
-
+  */
   snd_inited = 1;
   return 1;
 }
@@ -191,11 +239,25 @@
 int
 SNDDMA_GetDMAPos (void)
 {
-  if(snd_inited)
-    return dma.samplepos;
-  else
-    Com_Printf ("Sound not inizialized\n");
-  return 0;
+    int timerpos;
+    int send;
+    int taken;
+    timerpos = snd_pcm_avail(playback_handle);
+    if (timerpos<0){// likely buffer underrun.
+        timerpos = snd_pcm_prepare(playback_handle);
+        timerpos=0;}
+
+    send=AlsaFrames-timerpos;
+    if ( (send+AlsaPos)>BUFFER_SIZE )
+    {    memcpy (dma.buffer+BUFFER_SIZE*AFSize,
+                dma.buffer,AlsaFrames*AFSize);}
+    taken = snd_pcm_writei(playback_handle, dma.buffer+AlsaPos*AFSize, send);    
+    if (taken<0) {taken=0;}    
+
+    AlsaPos+=taken;
+    if (BUFFER_SIZE<=AlsaPos){AlsaPos -= BUFFER_SIZE;}
+    return AlsaPos*dma.channels; 
+
 }
 
 void
@@ -205,8 +267,8 @@
     snd_pcm_drop(playback_handle);
     snd_pcm_close(playback_handle);
     snd_inited = 0;
+    free(dma.buffer);
   }
-  free(dma.buffer);
   dma.buffer = NULL;
 }
 
@@ -217,13 +279,6 @@
 void
 SNDDMA_Submit (void)
 {
-  int written;
-  
-  if ((written = snd_pcm_writei(playback_handle, dma.buffer, snd_buf)) < 0) {
-    snd_pcm_prepare(playback_handle);
-    Com_Printf("alsa: buffer underrun\n");
-  }
-  dma.samplepos += written/(dma.samplebits/8);
 }