/*
- * Copyright (C) 2008 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2009 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
/** \file amp_filter.c Paraslash's amplify filter. */
+#include <regex.h>
+
#include "para.h"
#include "amp_filter.cmdline.h"
#include "list.h"
static ssize_t amp_convert(char *inbuf, size_t inbuf_len, struct filter_node *fn)
{
- size_t i, length = PARA_MIN((inbuf_len / 2) * 2,
- (fn->bufsize - fn->loaded) / 2 * 2);
+ size_t i, length = PARA_MIN((inbuf_len / 2),
+ (fn->bufsize - fn->loaded) / 2);
struct private_amp_data *pad = fn->private_data;
int16_t *ip = (int16_t *)inbuf, *op = (int16_t *)(fn->buf + fn->loaded);
+ int factor = 64 + pad->amp;
if (!length)
return 0;
- for (i = 0; i < length / 2; i++) {
- int x = (PARA_ABS(*ip) * (64 + pad->amp)) >> 6;
- *op++ = *ip++ > 0? PARA_MIN(x, 32767) : PARA_MAX(-x, -32768);
+
+ if (pad->amp == 0) {
+ memcpy(op, ip, length * 2);
+ goto out;
+ }
+ for (i = 0; i < length; i++) {
+ int x = (ip[i] * factor) >> 6;
+
+ op[i] = x;
+ if (op[i] != x)
+ op[i] = (x >= 32768)? 32767 : -32768;
}
- fn->loaded += length;
- return length;
+out:
+ fn->loaded += length * 2;
+ return length * 2;
}
static void amp_close(struct filter_node *fn)
pad->conf = fn->conf;
fn->private_data = pad;
- if (!pad->conf->amp_given && stat_item_values[SI_AMPLIFICATION]) {
- int i = SI_AMPLIFICATION;
- char *s = stat_item_values[i] + strlen(status_item_list[i]) + 1;
- sscanf(s, "%u", &pad->amp);
- } else
+ if (!pad->conf->amp_given && stat_item_values[SI_AMPLIFICATION])
+ sscanf(stat_item_values[SI_AMPLIFICATION], "%u", &pad->amp);
+ else
pad->amp = pad->conf->amp_arg;
fn->bufsize = AMP_CHUNK_SIZE;
fn->buf = para_malloc(fn->bufsize);
f->convert = amp_convert;
f->parse_config = amp_parse_config;
f->help = (struct ggo_help) {
- .purpose = amp_filter_args_info_purpose,
- .usage = amp_filter_args_info_usage,
.short_help = amp_filter_args_info_help,
.detailed_help = amp_filter_args_info_detailed_help
};