From ac7c48b4dee99d4c772f133d70d8d1b38262fcd2 Mon Sep 17 00:00:00 2001
From: Author Name <david@rowetel.com>
Date: Fri, 7 Jul 2023 12:20:59 +0930
Subject: shallow zip-file copy from codec2 e9d726bf20

---
 misc/pre.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 misc/pre.c

(limited to 'misc/pre.c')

diff --git a/misc/pre.c b/misc/pre.c
new file mode 100644
index 0000000..8016c3f
--- /dev/null
+++ b/misc/pre.c
@@ -0,0 +1,59 @@
+/*
+   pre.c
+   David Rowe
+   Sep 26 2012
+
+   Takes audio from a file, pre-emphasises, and sends to output file.
+*/
+
+#include <assert.h>
+#include <math.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include "lpc.h"
+
+#define N 80
+
+int main(int argc, char*argv[]) {
+    FILE  *fin, *fout;
+    short  buf[N];
+    float  Sn[N], Sn_pre[N];
+    float  pre_mem = 0.0;
+    int    i;
+
+    if (argc != 3) {
+	printf("usage: pre InputRawSpeechFile OutputRawSpeechFile\n");
+	printf("e.g    pre input.raw output.raw\n");
+	exit(1);
+    }
+
+    if (strcmp(argv[1], "-")  == 0) fin = stdin;
+    else if ( (fin = fopen(argv[1],"rb")) == NULL ) {
+	fprintf(stderr, "Error opening input speech file: %s: %s.\n",
+         argv[1], strerror(errno));
+	exit(1);
+    }
+
+    if (strcmp(argv[2], "-") == 0) fout = stdout;
+    else if ( (fout = fopen(argv[2],"wb")) == NULL ) {
+	fprintf(stderr, "Error opening output speech file: %s: %s.\n",
+         argv[2], strerror(errno));
+	exit(1);
+    }
+
+    while(fread(buf, sizeof(short), N, fin) == N) {
+	for(i=0; i<N; i++)
+	    Sn[i] = buf[i];
+	pre_emp(Sn_pre, Sn, &pre_mem, N);
+	for(i=0; i<N; i++)
+	    buf[i] = Sn_pre[i];
+	fwrite(buf, sizeof(short), N, fout);
+    }
+
+    fclose(fin);
+    fclose(fout);
+
+    return 0;
+}
-- 
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