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/* Effects.cpp - Various effects implementations, needs a cleanup
* Copyright (C) 1998-2002 Andy Lo A Foe <andy@loafoe.com>
*
* This file is part of AlsaPlayer.
*
* AlsaPlayer 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 3 of the License, or
* (at your option) any later version.
*
* AlsaPlayer 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, see <http://www.gnu.org/licenses/>.
*
*/
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include "Effects.h"
static char buf[DELAY_BUF_SIZE];
static char cont_buf[MAX_CHUNK];
static int head = 0;
void init_effects()
{
memset(buf, 0, sizeof(buf));
}
extern "C" {
void clear_buffer(void)
{
memset(buf, 0, sizeof(buf));
}
}
void buffer_effect(void *buffer, int size)
{
int tmp;
char *input = (char *)buffer;
if ((head + size) > DELAY_BUF_SIZE) {
memcpy(buf + head, input, DELAY_BUF_SIZE - head);
tmp = (DELAY_BUF_SIZE - head);
memcpy(buf, (input + tmp), size - tmp);
head = size - tmp;
} else {
memcpy(buf + head, input, size);
head += size;
}
}
void echo_effect32(void *buffer, int size, int delay, int vol)
{
int tail;
int tmp;
int gap = ((44100 * 2 * 2) / 1000) * delay;
if (size % 4) {
printf("Warning, size is not a multiple of 4\n");
}
tail = (head - gap) < 0 ?
DELAY_BUF_SIZE + (head - gap) : head - gap;
short *s = (short *)(buf + tail);
short *d = (short *)buffer;
int i, v;
if ((tail + size) > DELAY_BUF_SIZE) {
tmp = DELAY_BUF_SIZE - tail;
for (i = 0; i < tmp / 2; i++) {
v = ((*(s++) * vol)/100) + *d;
*(d++) = (v>32767) ? 32767 : ((v<-32768) ? -32768 : v);
}
tmp = size - (DELAY_BUF_SIZE - tail);
s = (short *)buf;
for (i = 0; i < tmp / 2; i++) {
v = ((*(s++) * vol)/100) + *d;
*(d++) = (v>32767) ? 32767 : ((v<-32768) ? -32768 : v);
}
} else {
for (i = 0; i < size / 2; i++) {
v = ((*(s++) * vol)/100) + *d;
*(d++) = (v>32767) ? 32767 : ((v<-32768) ? -32768 : v);
}
}
}
void volume_effect32(void *buffer, int length, float left, float right)
{
short *data = (short *)buffer;
if (right == -100.0) right=left;
for (int i=0; i < length << 1; i+=2) {
int v=(int) ((*(data) * (int)(left * 100)) / 100);
*(data++)=(v>32767) ? 32767 : ((v<-32768) ? -32768 : v);
v=(int) ((*(data) * (int)(right * 100)) / 100);
*(data++)=(v>32767) ? 32767 : ((v<-32768) ? -32768 : v);
}
}
char *delay_feed(int delay_bytes, int max_size)
{
int copy;
int copied = 0;
int use_head = head;
//memset(cont_buf, 0xf, max_size);
#if 1
if ((copy = use_head - delay_bytes) < 0) { // Wraparound to end of buffer
copy = abs(copy);
if (copy <= max_size) {
memcpy(cont_buf, buf + DELAY_BUF_SIZE - copy, copy);
copied+=copy;
memcpy(&cont_buf[copy], buf, max_size - copy);
copied+=(max_size - copy);
} else {
memcpy(cont_buf, buf + DELAY_BUF_SIZE - copy, max_size);
copied+=max_size;
}
//printf("copied = %d\n", copied);
return cont_buf;
}
#else
if ((copy = (use_head - delay_bytes + max_size)) > DELAY_BUF_SIZE) {
//printf("%d\n", DELAY_BUF_SIZE - (use_head - delay_bytes));
memcpy(cont_buf, &buf[use_head - delay_bytes], DELAY_BUF_SIZE - (use_head - delay_bytes));
memcpy(cont_buf + DELAY_BUF_SIZE - copy, buf, max_size - (DELAY_BUF_SIZE - copy));
return cont_buf;
}
#endif
//memcpy(cont_buf, buf + use_head - delay_bytes, max_size);
return (buf + use_head - delay_bytes);
//return cont_buf;
}
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