Create a new "Wireshark utility" library and move the mpeg-audio stuff from

wiretap to this new libwsutil.  This solves
http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=1677 by making libwireshark
no longer depend on libwiretap.

svn path=/trunk/; revision=25330

1 files changed, 98 insertions, 0 deletions

diff --git a/wsutil/mpeg-audio.h b/wsutil/mpeg-audio.h
new file mode 100644
index 0000000000..d0dfd26da2
--- /dev/null
+++ b/wsutil/mpeg-audio.h
@@ -0,0 +1,98 @@
+/* mpeg-audio.h
+ *
+ * MPEG Audio header dissection
+ * Written by Shaun Jackman <sjackman@gmail.com>
+ * Copyright 2007 Shaun Jackman
+ *
+ * $Id$
+ *
+ * Wiretap Library
+ * 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 MPA_H
+#define MPA_H 1
+
+struct mpa {
+	unsigned emphasis   :2;
+	unsigned original   :1;
+	unsigned copyright  :1;
+	unsigned modeext    :2;
+	unsigned mode       :2;
+	unsigned private    :1;
+	unsigned padding    :1;
+	unsigned frequency  :2;
+	unsigned bitrate    :4;
+	unsigned protection :1;
+	unsigned layer      :2;
+	unsigned version    :2;
+	unsigned sync       :11;
+};
+
+#define MPA_UNMARSHAL_SYNC(n)       ((n) >> 21 & 0x7ff)
+#define MPA_UNMARSHAL_VERSION(n)    ((n) >> 19 & 0x3)
+#define MPA_UNMARSHAL_LAYER(n)      ((n) >> 17 & 0x3)
+#define MPA_UNMARSHAL_PROTECTION(n) ((n) >> 16 & 0x1)
+#define MPA_UNMARSHAL_BITRATE(n)    ((n) >> 12 & 0xf)
+#define MPA_UNMARSHAL_FREQUENCY(n)  ((n) >> 10 & 0x3)
+#define MPA_UNMARSHAL_PADDING(n)    ((n) >>  9 & 0x1)
+#define MPA_UNMARSHAL_PRIVATE(n)    ((n) >>  8 & 0x1)
+#define MPA_UNMARSHAL_MODE(n)       ((n) >>  6 & 0x3)
+#define MPA_UNMARSHAL_MODEEXT(n)    ((n) >>  4 & 0x3)
+#define MPA_UNMARSHAL_COPYRIGHT(n)  ((n) >>  3 & 0x1)
+#define MPA_UNMARSHAL_ORIGINAL(n)   ((n) >>  2 & 0x1)
+#define MPA_UNMARSHAL_EMPHASIS(n)   ((n) >>  0 & 0x3)
+
+#define MPA_UNMARSHAL(mpa, n) do { \
+	(mpa)->sync       = MPA_UNMARSHAL_SYNC(n);       \
+	(mpa)->version    = MPA_UNMARSHAL_VERSION(n);    \
+	(mpa)->layer      = MPA_UNMARSHAL_LAYER(n);      \
+	(mpa)->protection = MPA_UNMARSHAL_PROTECTION(n); \
+	(mpa)->bitrate    = MPA_UNMARSHAL_BITRATE(n);    \
+	(mpa)->frequency  = MPA_UNMARSHAL_FREQUENCY(n);  \
+	(mpa)->padding    = MPA_UNMARSHAL_PADDING(n);    \
+	(mpa)->private    = MPA_UNMARSHAL_PRIVATE(n);    \
+	(mpa)->mode       = MPA_UNMARSHAL_MODE(n);       \
+	(mpa)->modeext    = MPA_UNMARSHAL_MODEEXT(n);    \
+	(mpa)->copyright  = MPA_UNMARSHAL_COPYRIGHT(n);  \
+	(mpa)->original   = MPA_UNMARSHAL_ORIGINAL(n);   \
+	(mpa)->emphasis   = MPA_UNMARSHAL_EMPHASIS(n);   \
+	} while (0)
+
+int mpa_version(const struct mpa *);
+int mpa_layer(const struct mpa *);
+unsigned mpa_samples(const struct mpa *);
+unsigned mpa_bitrate(const struct mpa *);
+unsigned mpa_frequency(const struct mpa *);
+unsigned mpa_padding(const struct mpa *);
+
+#define MPA_DATA_BYTES(mpa) (mpa_bitrate(mpa) * mpa_samples(mpa) \
+		/ mpa_frequency(mpa) / 8)
+#define MPA_BYTES(mpa) (MPA_DATA_BYTES(mpa) + mpa_padding(mpa))
+#define MPA_DURATION_NS(mpa) \
+	(1000000000 / mpa_frequency(mpa) * mpa_samples(mpa))
+
+enum { MPA_SYNC = 0x7ff };
+
+#define MPA_SYNC_VALID(mpa)      ((mpa)->sync == MPA_SYNC)
+#define MPA_VERSION_VALID(mpa)   (mpa_version(mpa) >= 0)
+#define MPA_LAYER_VALID(mpa)     (mpa_layer(mpa) >= 0)
+#define MPA_BITRATE_VALID(mpa)   (mpa_bitrate(mpa) > 0)
+#define MPA_FREQUENCY_VALID(mpa) (mpa_frequency(mpa) > 0)
+#define MPA_VALID(mpa) (MPA_SYNC_VALID(mpa) \
+		&& MPA_VERSION_VALID(mpa) && MPA_LAYER_VALID(mpa) \
+		&& MPA_BITRATE_VALID(mpa) && MPA_FREQUENCY_VALID(mpa))
+
+#endif