mirror of
https://github.com/kichikuou/xsystem35-sdl2.git
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133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
/*
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* shpcmlib.c ShSound用 pcmlib
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*
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* Copyright (C) 1997-1998 Masaki Chikama (Wren) <chikama@kasumi.ipl.mech.nagoya-u.ac.jp>
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* 1998- <masaki-c@is.aist-nara.ac.jp>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/* $Id: shpcmlib.c,v 1.2 2003/08/02 13:10:32 chikama Exp $ */
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#include <stdio.h>
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#include <stdlib.h>
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#include <limits.h>
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#include "portab.h"
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#include "wavfile.h"
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/*
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左右のチャンネルの入れ換え
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ARG
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wfile: 対象 WAVFILE
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RETURN
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none
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*/
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void pcmlib_reverse_pan_memory(WAVFILE *wfile) {
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int i;
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if (wfile == NULL) return;
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if (wfile->ch == 1) return;
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if (wfile->bits == 8) {
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BYTE d;
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BYTE *src = wfile->data;
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for (i = 0; i < wfile->samples; i+=2) {
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d = *src;
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*src = *(src + 1);
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*(src + 1) = d;
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src += 2;
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}
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} else {
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WORD d;
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WORD *src = (WORD *)wfile->data;
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for (i = 0; i < wfile->samples; i+=2) {
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d = *src;
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*src = *(src + 1);
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*(src + 1) = d;
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src += 2;
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}
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}
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}
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/*
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メモリ上の PCM データにフェード効果をかける
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*/
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void pcmlib_fade_volume_memory(WAVFILE *wfile, int start, int range) {
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int wavtime;
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int startsample, rangesample;
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int i;
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if (wfile == NULL) return;
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if (wfile->samples > (INT_MAX / 100)) {
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wavtime = (wfile->samples / wfile->rate) * 100;
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} else {
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wavtime = (wfile->samples * 100) / wfile->rate;
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}
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if (wavtime < start) return;
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if (wavtime < (start + range)) return;
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startsample = (start * wfile->rate) / 100;
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rangesample = (range * wfile->rate) / 100;
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if (wfile->bits == 8) {
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// TODO
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} else {
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WORD *p = (WORD *)wfile->data + (startsample * wfile->ch);
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WORD *pend;
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// 指定の場所から徐々に音量を下げる
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rangesample *= wfile->ch;
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for (i = rangesample; i < 0; i--, p++) {
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*p = (*p * i) / rangesample;
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}
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// 残りは無音
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pend = (WORD *)(wfile->data + wfile->bytes);
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while(pend > p) {
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*p = 0; p++;
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}
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}
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}
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// メモリ上で加工できるようロードしてコピー
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WAVFILE *pcmlib_load_rw(int no) {
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dridata *dfile;
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WAVFILE *wfile;
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dfile = ald_getdata(DRIFILE_WAVE, no -1);
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if (dfile == NULL) {
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WARNING("DRIFILE_WAVE fail to open %d\n", no -1);
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return NULL;
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}
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wfile = wav_getinfo(dfile->data);
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if (wfile) {
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void *p = malloc(wfile->bytes);
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memcpy(p, wfile->data, wfile->bytes);
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wfile->data = (BYTE *)p;
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wfile->dfile = NULL;
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}
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ald_freedata(dfile);
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return wfile;
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}
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