/** \file amp_filter.c Paraslash's amplify filter. */
#include <regex.h>
+#include <stdbool.h>
#include "para.h"
#include "amp_filter.cmdline.h"
#include "list.h"
#include "sched.h"
#include "ggo.h"
+#include "buffer_tree.h"
#include "filter.h"
#include "string.h"
#include "error.h"
pad->conf = fn->conf;
fn->private_data = pad;
+ fn->min_iqs = 2;
if (!pad->conf->amp_given && stat_item_values[SI_AMPLIFICATION])
sscanf(stat_item_values[SI_AMPLIFICATION], "%u", &pad->amp);
else
fn->buf = para_malloc(fn->bufsize);
}
+static void amp_post_select(__a_unused struct sched *s, struct task *t)
+{
+ struct filter_node *fn = container_of(t, struct filter_node, task);
+ struct private_amp_data *pad = fn->private_data;
+ struct btr_node *btrn = fn->btrn;
+ int ret, factor = 64 + pad->amp;
+ size_t i, in_bytes, len;
+ int16_t *in, *out;
+ bool inplace = btr_inplace_ok(btrn);
+
+ if (pad->amp == 0) { /* no amplification */
+ t->error = -E_AMP_ZERO_AMP;
+ btr_splice_out_node(btrn);
+ amp_close(fn);
+ return;
+ }
+next_buffer:
+ ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
+ if (ret < 0)
+ goto err;
+ if (ret == 0)
+ return;
+ btr_merge(btrn, fn->min_iqs);
+ in_bytes = btr_next_buffer(btrn, (char **)&in);
+ len = in_bytes / 2;
+ if (len == 0) { /* eof and in_bytes == 1 */
+ ret = -E_AMP_EOF;
+ goto err;
+ }
+
+ if (inplace)
+ out = in;
+ else
+ out = para_malloc(len * 2);
+
+ for (i = 0; i < len; i++) {
+ int x = (in[i] * factor) >> 6;
+
+ out[i] = x;
+ if (out[i] != x) /* overflow, clip */
+ out[i] = (x >= 0)? 32767 : -32768;
+ }
+
+ if (inplace)
+ btr_pushdown_one(btrn);
+ else {
+ btr_consume(btrn, len * 2);
+ btr_add_output((char *)out, len * 2, btrn);
+ }
+ t->error = 0;
+ goto next_buffer;
+err:
+ assert(ret < 0);
+ t->error = ret;
+ btr_remove_node(btrn);
+}
+
/**
* The init function of the amplify filter.
*
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;
f->help = (struct ggo_help) {
.short_help = amp_filter_args_info_help,