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authorMax Kellermann <max@duempel.org>2009-01-07 23:56:30 +0100
committerMax Kellermann <max@duempel.org>2009-01-07 23:56:30 +0100
commit954c2b5a2518e3e5c2a87595c18320de2cac14d6 (patch)
tree7e6851ae7870a06d14bfcbd153a1a8f261cca5f4 /src/pcm_buffer.h
parentbf058f978a51333e3881ad8c046ccc00bff8ef6c (diff)
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pcm_buffer: new library for temporary buffers
This library allocates temporary buffers for storing PCM conversion results. It should replace all those "static" buffer variables which are racy and never freed.
Diffstat (limited to '')
-rw-r--r--src/pcm_buffer.h74
1 files changed, 74 insertions, 0 deletions
diff --git a/src/pcm_buffer.h b/src/pcm_buffer.h
new file mode 100644
index 000000000..31975d5b6
--- /dev/null
+++ b/src/pcm_buffer.h
@@ -0,0 +1,74 @@
+/*
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef PCM_BUFFER_H
+#define PCM_BUFFER_H
+
+#include <glib.h>
+
+/**
+ * Manager for a temporary buffer which grows as needed. We could
+ * allocate a new buffer every time pcm_convert() is called, but that
+ * would put too much stress on the allocator.
+ */
+struct pcm_buffer {
+ char *buffer;
+
+ size_t size;
+};
+
+/**
+ * Initialize the buffer, but don't allocate anything yet.
+ */
+static inline void
+pcm_buffer_init(struct pcm_buffer *buffer)
+{
+ buffer->buffer = NULL;
+ buffer->size = 0;
+}
+
+/**
+ * Free resources. This function may be called more than once.
+ */
+static inline void
+pcm_buffer_deinit(struct pcm_buffer *buffer)
+{
+ g_free(buffer->buffer);
+
+ buffer->buffer = NULL;
+}
+
+/**
+ * Get the buffer, and guarantee a minimum size. This buffer becomes
+ * invalid with the next pcm_buffer_get() call.
+ */
+static inline void *
+pcm_buffer_get(struct pcm_buffer *buffer, size_t size)
+{
+ if (buffer->size < size) {
+ /* free the old buffer */
+ g_free(buffer->buffer);
+
+ /* allocate a new buffer; align at 64kB boundaries */
+ buffer->buffer = g_malloc((size | 0xffff) + 1);
+ }
+
+ return buffer->buffer;
+}
+
+#endif