--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mixer/converters.c	Sun Feb 27 19:55:29 2005 +0000
@@ -0,0 +1,208 @@
+/*
+ * SDL_sound -- An sound processing toolkit.
+ * Copyright (C) 2001  Ryan C. Gordon.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/**
+ * This file implements the mixer itself. Largely, this is handled in the
+ *  SDL audio callback.
+ *
+ * Documentation is in SDL_sound.h ... It's verbose, honest.  :)
+ *
+ * Please see the file COPYING in the source's root directory.
+ *
+ *  This file written by Ryan C. Gordon. (icculus@clutteredmind.org)
+ */
+
+#if HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "SDL.h"
+#include "SDL_thread.h"
+#include "SDL_sound.h"
+
+#define __SDL_SOUND_INTERNAL__
+#include "SDL_sound_internal.h"
+
+
+static void conv_mix_buf_u8_mono(void *userdata, Uint8 *_stream, int len)
+{
+    register Uint8 *stream = _stream;
+    register Uint32 i;
+    register Uint32 max = len * 2;
+    for (i = 0; i < max; i += 2)
+    {
+        *stream = (Uint8) ((((mixbuf[i]+mixbuf[i+1])*0.5f) * 127.0f) + 128.0f);
+        stream++;
+    } /* for */
+} /* conv_mix_buf_s8s */
+
+static void conv_mix_buf_s8_mono(void *userdata, Uint8 *_stream, int len)
+{
+    register Uint32 i;
+    register Sint8 *stream = (Sint8 *) _stream;
+    register Uint32 max = len * 2;
+    for (i = 0; i < max; i += 2)
+    {
+        *stream = (Sint8) (((mixbuf[i] + mixbuf[i+1]) * 0.5f) * 127.0f);
+        stream++;
+    } /* for */
+} /* conv_mix_buf_s8s */
+
+static void conv_mix_buf_s16_lsb_mono(void *userdata, Uint8 *_stream, int len)
+{
+    register Uint32 i;
+    register Sint16 *stream = (Sint16 *) _stream;
+    register Sint16 val;
+    register Uint32 max = len / 2;
+    for (i = 0; i < max; i += 2)
+    {
+        val = (Sint16) (((mixbuf[i] + mixbuf[i+1]) * 0.5f) * 32767.0f);
+        *stream = SDL_SwapLE16(val);
+        stream++;
+    } /* for */
+} /* conv_mix_buf_s16_lsb_mono */
+
+static void conv_mix_buf_s16_msb_mono(void *userdata, Uint8 *_stream, int len)
+{
+    register Uint32 i;
+    register Sint16 *stream = (Sint16 *) _stream;
+    register Sint16 val;
+    register Uint32 max = len / 2;
+    for (i = 0; i < max; i += 2)
+    {
+        val = (Sint16) (((mixbuf[i] + mixbuf[i+1]) * 0.5f) * 32767.0f);
+        *stream = SDL_SwapBE16(val);
+        stream++;
+    } /* for */
+} /* conv_mix_buf_s16_msb_mono */
+
+static void conv_mix_buf_u16_lsb_mono(void *userdata, Uint8 *_stream, int len)
+{
+    register Uint32 i;
+    register Uint16 *stream = (Uint16 *) _stream;
+    register Uint16 val;
+    register Uint32 max = len / 2;
+    for (i = 0; i < max; i += 2)
+    {
+        val = (Uint16)((((mixbuf[i]+mixbuf[i+1])*0.5f) * 32767.0f) + 32768.0f);
+        *stream = SDL_SwapLE16(val);
+        stream++;
+    } /* for */
+} /* conv_mix_buf_s16_lsb_mono */
+
+static void conv_mix_buf_u16_msb_mono(void *userdata, Uint8 *_stream, int len)
+{
+    register Uint32 i;
+    register Uint16 *stream = (Uint16 *) _stream;
+    register Uint16 val;
+    register Uint32 max = len / 2;
+    for (i = 0; i < max; i += 2)
+    {
+        val = (Uint16)((((mixbuf[i]+mixbuf[i+1])*0.5f) * 32767.0f) + 32768.0f);
+        *stream = SDL_SwapBE16(val);
+        stream++;
+    } /* for */
+} /* conv_mix_buf_s16_lsb_mono */
+
+static void conv_mix_buf_u8_stereo(void *userdata, Uint8 *_stream, int len)
+{
+    register Uint32 i;
+    register Uint8 *stream = _stream;
+    register Uint32 max = len;
+    for (i = 0; i < max; i++)
+    {
+        *stream = (Uint8) ((mixbuf[i] * 127.0f) + 128.0f);
+        stream++;
+    } /* for */
+} /* conv_mix_buf_s8s */
+
+static void conv_mix_buf_s8_stereo(void *userdata, Uint8 *_stream, int len)
+{
+    register Uint32 i;
+    register Sint8 *stream = (Sint8 *) _stream;
+    register Uint32 max = len;
+    for (i = 0; i < max; i++)
+    {
+        *stream = (Sint8) (mixbuf[i] * 127.0f);
+        stream++;
+    } /* for */
+} /* conv_mix_buf_s8s */
+
+static void conv_mix_buf_s16lsb_stereo(void *userdata, Uint8 *_stream, int len)
+{
+    register Uint32 i;
+    register Sint16 *stream = (Sint16 *) _stream;
+    register Sint16 val;
+    register Uint32 max = len / 2;
+    for (i = 0; i < max; i++)
+    {
+        val = (Sint16) (mixbuf[i] * 32767.0f);
+        *stream = SDL_SwapLE16(val);
+        stream++;
+    } /* for */
+} /* conv_mix_buf_s16_lsb_stereo */
+
+static void conv_mix_buf_s16msb_stereo(void *userdata, Uint8 *_stream, int len)
+{
+    register Uint32 i;
+    register Sint16 *stream = (Sint16 *) _stream;
+    register Sint16 val;
+    register Uint32 max = len / 2;
+    for (i = 0; i < max; i++)
+    {
+        val = (Sint16) (mixbuf[i] * 32767.0f);
+        *stream = SDL_SwapBE16(val);
+        stream++;
+    } /* for */
+} /* conv_mix_buf_s16_msb_stereo */
+
+static void conv_mix_buf_u16lsb_stereo(void *userdata, Uint8 *_stream, int len)
+{
+    register Uint32 i;
+    register Uint16 *stream = (Uint16 *) _stream;
+    register Uint16 val;
+    register Uint32 max = len / 2;
+    for (i = 0; i < max; i++)
+    {
+        val = (Uint16) ((mixbuf[i] * 32767.0f) + 32768.0f);
+        *stream = SDL_SwapLE16(val);
+        stream++;
+    } /* for */
+} /* conv_mix_buf_s16_lsb_stereo */
+
+static void conv_mix_buf_u16msb_stereo(void *userdata, Uint8 *_stream, int len)
+{
+    register Uint32 i;
+    register Uint16 *stream = (Uint16 *) _stream;
+    register Uint16 val;
+    register Uint32 max = len / 2;
+    for (i = 0; i < max; i++)
+    {
+        val = (Uint16) ((mixbuf[i] * 32767.0f) + 32768.0f);
+        *stream = SDL_SwapBE16(val);
+        stream++;
+    } /* for */
+} /* conv_mix_buf_s16_msb_stereo */
+
+/* end of converters.c ... */
+