Add reverse_endian field to struct audio_format and handle conversion

src/pcm_byteswap.c

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2003-2009 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "pcm_byteswap.h"
+#include "pcm_buffer.h"
+
+#include <glib.h>
+
+#include <assert.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "pcm"
+
+static inline uint16_t swab16(uint16_t x)
+{
+	return (x << 8) | (x >> 8);
+}
+
+const int16_t *pcm_byteswap_16(struct pcm_buffer *buffer,
+			       const int16_t *src, size_t len)
+{
+	unsigned i;
+	int16_t *buf = pcm_buffer_get(buffer, len);
+
+	if (!buf)
+		return NULL;
+
+	for (i = 0; i < len / 2; i++)
+		buf[i] = swab16(src[i]);
+
+	return buf;
+}
+
+static inline uint32_t swab32(uint32_t x)
+{
+	return (x << 24) | 
+		((x & 0xff00) << 8) |
+		((x & 0xff0000) >> 8) |
+		(x >> 24);
+}
+
+const int32_t *pcm_byteswap_32(struct pcm_buffer *buffer,
+			       const int32_t *src, size_t len)
+{
+	unsigned i;
+	int32_t *buf = pcm_buffer_get(buffer, len);
+
+	if (!buf)
+		return NULL;
+
+	for (i = 0; i < len / 4; i++)
+		buf[i] = swab32(src[i]);
+
+	return buf;
+}