# HG changeset patch
# User Mychaela Falconia <falcon@freecalypso.org>
# Date 1668904302 0
# Node ID a3aa152c46532105573541f78a14b4c2e1627fea
# Parent  820d88b979249a089ce51a5bb06c10965f271c82
libtest: pcmwrite helper function and module

diff -r 820d88b97924 -r a3aa152c4653 libtest/Makefile
--- a/libtest/Makefile	Sat Nov 19 23:57:42 2022 +0000
+++ b/libtest/Makefile	Sun Nov 20 00:31:42 2022 +0000
@@ -1,6 +1,6 @@
 CC=	gcc
 CFLAGS=	-O2
-OBJS=	binreader.o wavreader.o wavwriter.o
+OBJS=	binreader.o pcmwrite.o wavreader.o wavwriter.o
 LIB=	libtest.a
 
 all:	${LIB}
diff -r 820d88b97924 -r a3aa152c4653 libtest/pcmwrite.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtest/pcmwrite.c	Sun Nov 20 00:31:42 2022 +0000
@@ -0,0 +1,22 @@
+/*
+ * Here we implement our PCM write helper function.
+ */
+
+#include <stdint.h>
+#include "wavwriter.h"
+#include "pcmwrite.h"
+
+void write_pcm_to_wav(void *wav, const int16_t *pcm)
+{
+	uint8_t bytes[320], *dp;
+	int16_t samp;
+	unsigned n;
+
+	dp = bytes;
+	for (n = 0; n < 160; n++) {
+		samp = pcm[n];
+		*dp++ = samp & 0xFF;
+		*dp++ = (samp >> 8) & 0xFF;
+	}
+	wav_write_data(wav, bytes, 320);
+}
diff -r 820d88b97924 -r a3aa152c4653 libtest/pcmwrite.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtest/pcmwrite.h	Sun Nov 20 00:31:42 2022 +0000
@@ -0,0 +1,6 @@
+/*
+ * This header file declares the interface to our helper function
+ * for writing 16-bit linear PCM samples to WAV output file.
+ */
+
+extern void write_pcm_to_wav(void *wav, const int16_t *pcm);