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authorMax Kellermann <max@duempel.org>2013-01-15 01:12:08 +0100
committerMax Kellermann <max@duempel.org>2013-01-15 10:59:28 +0100
commit3e035279300d1ac238f2f063e5ca5f478923d7cb (patch)
treeac49f4cbcf26317ac6836c1d77966287815eaf1f /src/util/PeakBuffer.hxx
parent4fa724461e558561402b05bd4eadf8c7b6874556 (diff)
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Client: move output buffer code to new class PeakBuffer
Diffstat (limited to 'src/util/PeakBuffer.hxx')
-rw-r--r--src/util/PeakBuffer.hxx66
1 files changed, 66 insertions, 0 deletions
diff --git a/src/util/PeakBuffer.hxx b/src/util/PeakBuffer.hxx
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+++ b/src/util/PeakBuffer.hxx
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+/*
+ * Copyright (C) 2003-2013 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.
+ */
+
+#ifndef MPD_PEAK_BUFFER_HXX
+#define MPD_PEAK_BUFFER_HXX
+
+#include "gcc.h"
+
+#include <stddef.h>
+
+struct fifo_buffer;
+
+/**
+ * A FIFO-like buffer that will allocate more memory on demand to
+ * allow large peaks. This second buffer will be given back to the
+ * kernel when it has been consumed.
+ */
+class PeakBuffer {
+ size_t normal_size, peak_size;
+
+ fifo_buffer *normal_buffer, *peak_buffer;
+
+public:
+ PeakBuffer(size_t _normal_size, size_t _peak_size)
+ :normal_size(_normal_size), peak_size(_peak_size),
+ normal_buffer(nullptr), peak_buffer(nullptr) {}
+
+ PeakBuffer(PeakBuffer &&other)
+ :normal_size(other.normal_size), peak_size(other.peak_size),
+ normal_buffer(other.normal_buffer),
+ peak_buffer(other.peak_buffer) {
+ other.normal_buffer = nullptr;
+ other.peak_buffer = nullptr;
+ }
+
+ ~PeakBuffer();
+
+ PeakBuffer(const PeakBuffer &) = delete;
+ PeakBuffer &operator=(const PeakBuffer &) = delete;
+
+ gcc_pure
+ bool IsEmpty() const;
+
+ const void *Read(size_t *length_r) const;
+ void Consume(size_t length);
+
+ bool Append(const void *data, size_t length);
+};
+
+#endif