From c9a53bcf7616ded009df401cc84dbc90e1b4092f Mon Sep 17 00:00:00 2001
From: Paweł Kołodziejski
Date: Sun, 19 May 2002 15:20:18 +0000
Subject: The Dig: 16 bit samples and mixer

svn-id: r4358
---
 sound/mixer.cpp | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

(limited to 'sound/mixer.cpp')

diff --git a/sound/mixer.cpp b/sound/mixer.cpp
index a47965ca65..587e524185 100644
--- a/sound/mixer.cpp
+++ b/sound/mixer.cpp
@@ -184,6 +184,8 @@ SoundMixer::Channel_RAW::Channel_RAW(SoundMixer *mixer, void *sound, uint32 size
 	_realsize = size;
 	_rate = rate;
 	_size = size * mixer->_output_rate / rate;
+	if (_flags & FLAG_16BITS) _size = _size >> 1;
+	if (_flags & FLAG_STEREO) _size = _size >> 1;
 }
 
 void SoundMixer::Channel_RAW::append(void *data, uint32 len) {   
@@ -207,6 +209,8 @@ void SoundMixer::Channel_RAW::append(void *data, uint32 len) {
   /* Reset sizes */
   _realsize = _cur_size + len;
   _size     = _realsize * _mixer->_output_rate / _rate;
+  if (_flags & FLAG_16BITS) _size = _size >> 1;
+  if (_flags & FLAG_STEREO) _size = _size >> 1;
   _pos		= 0;
   _fp_pos	= 0;
 
@@ -248,7 +252,19 @@ static void mix_unsigned_stereo_8(int16 *data, uint len, byte **s_ptr, uint32 *f
 	warning("Mixing stereo unsigned 8 bit is not supported yet ");
 }
 static void mix_signed_mono_16(int16 *data, uint len, byte **s_ptr, uint32 *fp_pos_ptr, int fp_speed, const int16 *vol_tab) {
-	warning("Mixing mono signed 16 bit is not supported yet ");
+	uint32 fp_pos = *fp_pos_ptr;
+	byte *s = *s_ptr;
+	do {
+		fp_pos += fp_speed;
+		// FIXME: missing volume table
+		*data++ += (*s << 8) + *(s + 1);
+		*data++ += (*s << 8) + *(s + 1);
+		s += (fp_pos >> 16) << 1;
+		fp_pos &= 0x0000FFFF;
+	} while (--len);
+
+	*fp_pos_ptr = fp_pos;
+	*s_ptr = s;
 }
 static void mix_unsigned_mono_16(int16 *data, uint len, byte **s_ptr, uint32 *fp_pos_ptr, int fp_speed, const int16 *vol_tab) {
 	warning("Mixing mono unsigned 16 bit is not supported yet ");
-- 
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