diff --git a/programs/develop/sdk/trunk/sound/include/snd.inc b/programs/develop/sdk/trunk/sound/include/snd.inc
index 265d121982..c8337e83c7 100644
--- a/programs/develop/sdk/trunk/sound/include/snd.inc
+++ b/programs/develop/sdk/trunk/sound/include/snd.inc
@@ -29,6 +29,7 @@ SND_GETVOLUME       equ 13
 SND_SETPAN          equ 14
 SND_GETPAN          equ 15
 SND_GETBUFFSIZE     equ 16
+SND_GETFREESPACE    equ 17
 
 DEV_SET_BUFF        equ  4
 DEV_NOTIFY          equ  5
diff --git a/programs/develop/sdk/trunk/sound/include/sound.h b/programs/develop/sdk/trunk/sound/include/sound.h
index 430c210e36..48bb53b67b 100644
--- a/programs/develop/sdk/trunk/sound/include/sound.h
+++ b/programs/develop/sdk/trunk/sound/include/sound.h
@@ -7,7 +7,7 @@ extern "C"
 {
 #endif
 
-#define SOUND_VERSION 0x0100
+#define SOUND_VERSION 0x0101
 #define PCM_ALL       0
 
 #define PCM_OUT       0x08000000
@@ -70,6 +70,7 @@ extern "C"
 #define SND_SETPAN         14
 #define SND_GETPAN         15
 #define SND_GETBUFFSIZE    16
+#define SND_GETFREESPACE   17
 
 #define PLAY_SYNC     0x80000000
 
@@ -87,6 +88,7 @@ int _stdcall  ResetBuffer(SNDBUF hBuff, unsigned int flags);
 int _stdcall  SetBufferPos(SNDBUF hBuff, int offset);
 int _stdcall  GetBufferPos(SNDBUF hBuff, int *offset);
 int _stdcall  GetBufferSize(SNDBUF hBuff, int *size);
+int _stdcall  GetBufferFree(SNDBUF hBuff, int *free);
 
 int _stdcall  SetBuffer(SNDBUF hBuff,void* buff,
                         int offs, int size);
diff --git a/programs/develop/sdk/trunk/sound/src/snd.inc b/programs/develop/sdk/trunk/sound/src/snd.inc
index 265d121982..c8337e83c7 100644
--- a/programs/develop/sdk/trunk/sound/src/snd.inc
+++ b/programs/develop/sdk/trunk/sound/src/snd.inc
@@ -29,6 +29,7 @@ SND_GETVOLUME       equ 13
 SND_SETPAN          equ 14
 SND_GETPAN          equ 15
 SND_GETBUFFSIZE     equ 16
+SND_GETFREESPACE    equ 17
 
 DEV_SET_BUFF        equ  4
 DEV_NOTIFY          equ  5
diff --git a/programs/develop/sdk/trunk/sound/src/sndgetsize.asm b/programs/develop/sdk/trunk/sound/src/sndgetsize.asm
index 4864c54a6e..0a598b7026 100644
--- a/programs/develop/sdk/trunk/sound/src/sndgetsize.asm
+++ b/programs/develop/sdk/trunk/sound/src/sndgetsize.asm
@@ -6,6 +6,7 @@ include "proc32.inc"
 section '.text' align 16 code readable executable
 
 public _GetBufferSize@8
+public _GetBufferFree@8
 
 extrn hSound
 
@@ -34,3 +35,29 @@ _GetBufferSize@8:      ;str:dword, p_size:dword
            pop ebx
            ret 8
            
+align 4
+_GetBufferFree@8:      ;str:dword, p_free:dword
+           push ebx
+           push ecx
+           
+           lea ebx, [esp+12]      ;[stream]
+           push 0                 ;storage for free_space    
+           mov eax, esp
+
+           push 4                 ;.out_size
+           push eax               ;.output
+           push 4                 ;.inp_size
+           push ebx               ;.input
+           push SND_GETFREESPACE  ;.code
+           push dword [hSound]    ;.handle
+
+           mov eax, 68
+           mov ebx, 17
+           mov ecx, esp
+           int 0x40
+           add esp, 24
+           mov ecx, [esp+20]      ; p_free  
+           pop dword [ecx]
+           pop ecx 
+           pop ebx
+           ret 8
diff --git a/programs/media/ac97snd/trunk/sound.h b/programs/media/ac97snd/trunk/sound.h
index 430c210e36..2a921690e4 100644
--- a/programs/media/ac97snd/trunk/sound.h
+++ b/programs/media/ac97snd/trunk/sound.h
@@ -7,7 +7,7 @@ extern "C"
 {
 #endif
 
-#define SOUND_VERSION 0x0100
+#define SOUND_VERSION 0x0101
 #define PCM_ALL       0
 
 #define PCM_OUT       0x08000000
@@ -70,6 +70,8 @@ extern "C"
 #define SND_SETPAN         14
 #define SND_GETPAN         15
 #define SND_GETBUFFSIZE    16
+#define SND_GETFREESPACE   17
+
 
 #define PLAY_SYNC     0x80000000
 
@@ -87,6 +89,7 @@ int _stdcall  ResetBuffer(SNDBUF hBuff, unsigned int flags);
 int _stdcall  SetBufferPos(SNDBUF hBuff, int offset);
 int _stdcall  GetBufferPos(SNDBUF hBuff, int *offset);
 int _stdcall  GetBufferSize(SNDBUF hBuff, int *size);
+int _stdcall  GetBufferFree(SNDBUF hBuff, int *free);
 
 int _stdcall  SetBuffer(SNDBUF hBuff,void* buff,
                         int offs, int size);