pcm_*: move to src/pcm/

1 files changed, 58 insertions, 0 deletions

diff --git a/src/pcm/pcm_buffer.c b/src/pcm/pcm_buffer.c
new file mode 100644
index 000000000..4b1eb875a
--- /dev/null
+++ b/src/pcm/pcm_buffer.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2003-2011 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_buffer.h"
+#include "poison.h"
+
+/**
+ * Align the specified size to the next 8k boundary.
+ */
+G_GNUC_CONST
+static size_t
+align_8k(size_t size)
+{
+	return ((size - 1) | 0x1fff) + 1;
+}
+
+void *
+pcm_buffer_get(struct pcm_buffer *buffer, size_t size)
+{
+	assert(buffer != NULL);
+
+	if (size == 0)
+		/* never return NULL, because NULL would be assumed to
+		   be an error condition */
+		size = 1;
+
+	if (buffer->size < size) {
+		/* free the old buffer */
+		g_free(buffer->buffer);
+
+		buffer->size = align_8k(size);
+		buffer->buffer = g_malloc(buffer->size);
+	} else {
+		/* discard old buffer contents */
+		poison_undefined(buffer->buffer, buffer->size);
+	}
+
+	assert(buffer->size >= size);
+
+	return buffer->buffer;
+}