/*
- * Copyright (C) 2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2009-2010 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
#include "string.h"
#include "error.h"
-/** The size of the output data buffer. */
-#define AMP_CHUNK_SIZE 40960
-
extern char *stat_item_values[NUM_STAT_ITEMS];
/** Data specific to the amplify filter. */
unsigned amp;
};
-static ssize_t amp_convert(char *inbuf, size_t inbuf_len, struct filter_node *fn)
-{
- 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;
-
- 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;
- }
-out:
- fn->loaded += length * 2;
- return length * 2;
-}
-
static void amp_close(struct filter_node *fn)
{
free(fn->private_data);
- free(fn->buf);
}
static int amp_parse_config(int argc, char **argv, void **config)
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);
PARA_NOTICE_LOG("amplification: %u (scaling factor: %1.2f)\n",
pad->amp, pad->amp / 64.0 + 1.0);
}
amp_cmdline_parser_init(&dummy);
f->open = amp_open;
f->close = amp_close;
- f->convert = amp_convert;
f->pre_select = generic_filter_pre_select;
f->post_select = amp_post_select;
f->parse_config = amp_parse_config;