From NetBSD: Simple conversions of audio streams, for use with the newer

MI audio subsystem (actually one of two :-) ) coming after 2.2

2 files changed, 198 insertions, 0 deletions

diff --git a/sys/dev/auconv.c b/sys/dev/auconv.c
new file mode 100644
index 00000000000..d144027462c
--- /dev/null
+++ b/sys/dev/auconv.c
@@ -0,0 +1,152 @@
+/*	$OpenBSD: auconv.c,v 1.1 1997/10/07 14:07:45 niklas Exp $	*/
+/*	$NetBSD: auconv.c,v 1.2 1997/08/24 22:20:24 augustss Exp $	*/
+
+/*
+ * Copyright (c) 1996 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the Computer Systems
+ *	Engineering Group at Lawrence Berkeley Laboratory.
+ * 4. Neither the name of the University nor of the Laboratory may be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#include <sys/types.h>
+#include <sys/audioio.h>
+#include <machine/endian.h>
+#include <dev/auconv.h>
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+#define LO 0
+#define HI 1
+#else
+#define LO 1
+#define HI 0
+#endif
+
+void
+change_sign8(v, p, cc)
+	void *v;
+	u_char *p;
+	int cc;
+{
+	while (--cc >= 0) {
+		*p ^= 0x80;
+		++p;
+	}
+}
+
+void
+change_sign16(v, p, cc)
+	void *v;
+	u_char *p;
+	int cc;
+{
+	while ((cc -= 2) >= 0) {
+		p[HI] ^= 0x80;
+		p += 2;
+	}
+}
+
+void
+swap_bytes(v, p, cc)
+	void *v;
+	u_char *p;
+	int cc;
+{
+	u_char t;
+
+	while ((cc -= 2) >= 0) {
+		t = p[0];
+		p[0] = p[1];
+		p[1] = t;
+		p += 2;
+	}
+}
+
+void
+swap_bytes_change_sign16(v, p, cc)
+	void *v;
+	u_char *p;
+	int cc;
+{
+	u_char t;
+
+	while ((cc -= 2) >= 0) {
+		t = p[HI];
+		p[HI] = p[LO] ^ 0x80;
+		p[LO] = t;
+		p += 2;
+	}
+}
+
+void
+change_sign16_swap_bytes(v, p, cc)
+	void *v;
+	u_char *p;
+	int cc;
+{
+	u_char t;
+
+	while ((cc -= 2) >= 0) {
+		t = p[LO];
+		p[LO] = p[HI] ^ 0x80;
+		p[HI] = t;
+		p += 2;
+	}
+}
+
+void
+linear8_to_linear16(v, p, cc)
+	void *v;
+	u_char *p;
+	int cc;
+{
+	u_char *q = p;
+
+	p += cc;
+	q += cc * 2;
+	while (--cc >= 0) {
+		q -= 2;
+		q[HI] = *--p;
+		q[LO] = 0;
+	}
+}
+
+void
+linear16_to_linear8(v, p, cc)
+	void *v;
+	u_char *p;
+	int cc;
+{
+	u_char *q = p;
+
+	while ((cc -= 2) >= 0) {
+		*q++ = p[HI];
+		p += 2;
+	}
+}
diff --git a/sys/dev/auconv.h b/sys/dev/auconv.h
new file mode 100644
index 00000000000..4e52bfdb62c
--- /dev/null
+++ b/sys/dev/auconv.h
@@ -0,0 +1,46 @@
+/*	$OpenBSD: auconv.h,v 1.1 1997/10/07 14:07:46 niklas Exp $	*/
+/*	$NetBSD: auconv.h,v 1.2 1997/08/24 22:20:25 augustss Exp $	*/
+
+/*-
+ * Copyright (c) 1996 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *        This product includes software developed by the NetBSD
+ *        Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* Convert between signed and unsigned. */
+extern void change_sign8 __P((void *, u_char *, int));
+extern void change_sign16 __P((void *, u_char *, int));
+/* Convert between little and big endian. */
+extern void swap_bytes __P((void *, u_char *, int));
+extern void swap_bytes_change_sign16 __P((void *, u_char *, int));
+extern void change_sign16_swap_bytes __P((void *, u_char *, int));
+/* Byte expansion/contraction */
+extern void linear8_to_linear16 __P((void *, u_char *, int));
+extern void linear16_to_linear8 __P((void *, u_char *, int));