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-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
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+++ b/src/pcm_buffer.h
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+/*
+ * 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