+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;
+ char *in;
+ size_t in_len = btr_next_buffer(btrn, &in);
+ size_t i, length = in_len / 2;
+ int16_t *ip = (int16_t *)in, *op;
+ bool inplace = btr_inplace_ok(btrn);
+
+ ret = prepare_filter_node(fn);
+ if (ret < 0)
+ goto err;
+ if (ret == 0)
+ return;
+
+ if (inplace)
+ op = ip;
+ else
+ op = para_malloc(length * 2);
+ if (pad->amp == 0) {
+ memcpy(op, ip, length * 2);
+ goto success;
+ }
+ 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;
+ }
+success:
+ t->error = 0;
+ if (inplace)
+ btr_pushdown_one(btrn);
+ else {
+ btr_consume(btrn, length * 2);
+ btr_add_output((char *)op, length * 2, btrn);
+ }
+ return;
+err:
+ assert(ret < 0);
+ amp_close(fn);
+ t->error = ret;
+ btr_del_node(btrn);
+}
+