www.pudn.com > gspmidi101src.zip > output.c

/* 
 
TiMidity -- Experimental MIDI to WAVE converter 
Copyright (C) 1995 Tuukka Toivonen  
 
This program is free software; you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published by 
the Free Software Foundation; either version 2 of the License, or 
(at your option) any later version. 
 
This program 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 General Public License for more details. 
 
You should have received a copy of the GNU General Public License 
along with this program; if not, write to the Free Software 
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 
 
output.c 
 
Audio output (to file / device) functions. 
*/ 
 
#include "config.h" 
#include "output.h" 
#include "tables.h" 
 
extern PlayMode gsp_play_mode; 
 
PlayMode *play_mode_list[] = { 
    &gsp_play_mode, 
    0 
}; 
 
PlayMode *play_mode = &gsp_play_mode; 
 
/*****************************************************************/ 
/* Some functions to convert signed 32-bit data to other formats */ 
 
void s32tos8(int32 *lp, int32 c) 
{ 
    int8 *cp=(int8 *)(lp); 
    int32 l; 
    while (c--) 
    { 
        l=(*lp++)>>(32-8-GUARD_BITS); 
        if (l>127) l=127; 
        else if (l<-128) l=-128; 
        *cp++ = (int8) (l); 
    } 
} 
 
void s32tou8(int32 *lp, int32 c) 
{ 
    uint8 *cp=(uint8 *)(lp); 
    int32 l; 
    while (c--) 
    { 
        l=(*lp++)>>(32-8-GUARD_BITS); 
        if (l>127) l=127; 
        else if (l<-128) l=-128; 
        *cp++ = 0x80 ^ ((uint8) l); 
    } 
} 
 
void s32tos16(int32 *lp, int32 c) 
{ 
    int16 *sp=(int16 *)(lp); 
    int32 l; 
    while (c--) 
    { 
        l=(*lp++)>>(32-16-GUARD_BITS); 
        if (l > 32767) l=32767; 
        else if (l<-32768) l=-32768; 
        *sp++ = (int16)(l); 
    } 
} 
 
void s32tou16(int32 *lp, int32 c) 
{ 
    uint16 *sp=(uint16 *)(lp); 
    int32 l; 
    while (c--) 
    { 
        l=(*lp++)>>(32-16-GUARD_BITS); 
        if (l > 32767) l=32767; 
        else if (l<-32768) l=-32768; 
        *sp++ = 0x8000 ^ (uint16)(l); 
    } 
} 
 
void s32tos16x(int32 *lp, int32 c) 
{ 
    int16 *sp=(int16 *)(lp); 
    int32 l; 
    while (c--) 
    { 
        l=(*lp++)>>(32-16-GUARD_BITS); 
        if (l > 32767) l=32767; 
        else if (l<-32768) l=-32768; 
        *sp++ = XCHG_SHORT((int16)(l)); 
    } 
} 
 
void s32tou16x(int32 *lp, int32 c) 
{ 
    uint16 *sp=(uint16 *)(lp); 
    int32 l; 
    while (c--) 
    { 
        l=(*lp++)>>(32-16-GUARD_BITS); 
        if (l > 32767) l=32767; 
        else if (l<-32768) l=-32768; 
        *sp++ = XCHG_SHORT(0x8000 ^ (uint16)(l)); 
    } 
} 
 
void s32toulaw(int32 *lp, int32 c) 
{ 
    uint8 *up=(uint8 *)(lp); 
    int32 l; 
    while (c--) 
    { 
        l=(*lp++)>>(32-13-GUARD_BITS); 
        if (l > 4095) l=4095; 
        else if (l<-4096) l=-4096; 
        *up++ = _l2u[l]; 
    } 
}