/project/jni/sdl_sound/decoders/timidity/output.c

  1/* 
  2
  3    TiMidity -- Experimental MIDI to WAVE converter
  4    Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>
  5
  6    This program is free software; you can redistribute it and/or modify
  7    it under the terms of the GNU General Public License as published by
  8    the Free Software Foundation; either version 2 of the License, or
  9    (at your option) any later version.
 10
 11    This program is distributed in the hope that it will be useful,
 12    but WITHOUT ANY WARRANTY; without even the implied warranty of
 13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14    GNU General Public License for more details.
 15
 16    You should have received a copy of the GNU General Public License
 17    along with this program; if not, write to the Free Software
 18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 19
 20    output.c
 21    
 22    Audio output (to file / device) functions.
 23*/
 24
 25#if HAVE_CONFIG_H
 26#  include <config.h>
 27#endif
 28
 29#include "SDL_sound.h"
 30
 31#define __SDL_SOUND_INTERNAL__
 32#include "SDL_sound_internal.h"
 33
 34#include "options.h"
 35#include "output.h"
 36
 37/*****************************************************************/
 38/* Some functions to convert signed 32-bit data to other formats */
 39
 40void s32tos8(void *dp, Sint32 *lp, Sint32 c)
 41{
 42  Sint8 *cp=(Sint8 *)(dp);
 43  Sint32 l;
 44  while (c--)
 45    {
 46      l=(*lp++)>>(32-8-GUARD_BITS);
 47      if (l>127) l=127;
 48      else if (l<-128) l=-128;
 49      *cp++ = (Sint8) (l);
 50    }
 51}
 52
 53void s32tou8(void *dp, Sint32 *lp, Sint32 c)
 54{
 55  Uint8 *cp=(Uint8 *)(dp);
 56  Sint32 l;
 57  while (c--)
 58    {
 59      l=(*lp++)>>(32-8-GUARD_BITS);
 60      if (l>127) l=127;
 61      else if (l<-128) l=-128;
 62      *cp++ = 0x80 ^ ((Uint8) l);
 63    }
 64}
 65
 66void s32tos16(void *dp, Sint32 *lp, Sint32 c)
 67{
 68  Sint16 *sp=(Sint16 *)(dp);
 69  Sint32 l;
 70  while (c--)
 71    {
 72      l=(*lp++)>>(32-16-GUARD_BITS);
 73      if (l > 32767) l=32767;
 74      else if (l<-32768) l=-32768;
 75      *sp++ = (Sint16)(l);
 76    }
 77}
 78
 79void s32tou16(void *dp, Sint32 *lp, Sint32 c)
 80{
 81  Uint16 *sp=(Uint16 *)(dp);
 82  Sint32 l;
 83  while (c--)
 84    {
 85      l=(*lp++)>>(32-16-GUARD_BITS);
 86      if (l > 32767) l=32767;
 87      else if (l<-32768) l=-32768;
 88      *sp++ = 0x8000 ^ (Uint16)(l);
 89    }
 90}
 91
 92void s32tos16x(void *dp, Sint32 *lp, Sint32 c)
 93{
 94  Sint16 *sp=(Sint16 *)(dp);
 95  Sint32 l;
 96  while (c--)
 97    {
 98      l=(*lp++)>>(32-16-GUARD_BITS);
 99      if (l > 32767) l=32767;
100      else if (l<-32768) l=-32768;
101      *sp++ = SDL_Swap16((Sint16)(l));
102    }
103}
104
105void s32tou16x(void *dp, Sint32 *lp, Sint32 c)
106{
107  Uint16 *sp=(Uint16 *)(dp);
108  Sint32 l;
109  while (c--)
110    {
111      l=(*lp++)>>(32-16-GUARD_BITS);
112      if (l > 32767) l=32767;
113      else if (l<-32768) l=-32768;
114      *sp++ = SDL_Swap16(0x8000 ^ (Uint16)(l));
115    }
116}