output/{alsa,oss}: move endian code to new library pcm_export

src/pcm_export.c

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2003-2012 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 "config.h"
+#include "pcm_export.h"
+#include "pcm_byteswap.h"
+
+void
+pcm_export_init(struct pcm_export_state *state)
+{
+	pcm_buffer_init(&state->reverse_buffer);
+}
+
+void pcm_export_deinit(struct pcm_export_state *state)
+{
+	pcm_buffer_deinit(&state->reverse_buffer);
+}
+
+void
+pcm_export_open(struct pcm_export_state *state,
+		enum sample_format sample_format,
+		bool reverse_endian)
+{
+	state->sample_format = sample_format;
+	state->reverse_endian = reverse_endian;
+}
+
+const void *
+pcm_export(struct pcm_export_state *state, const void *data, size_t size,
+	   size_t *dest_size_r)
+{
+	if (state->reverse_endian)
+		data = pcm_byteswap(&state->reverse_buffer,
+				    state->sample_format, data, size);
+
+	*dest_size_r = size;
+	return data;
+}