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, 96 insertions, 0 deletions

diff --git a/wsutil/mpeg-audio.c b/wsutil/mpeg-audio.c
new file mode 100644
index 0000000000..cca12be56b
--- /dev/null
+++ b/wsutil/mpeg-audio.c
@@ -0,0 +1,96 @@
+/* mpeg-audio.c
+ *
+ * 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.
+ */
+
+#include "mpeg-audio.h"
+
+static const int mpa_versions[4] = { 2, -1, 1, 0 };
+static const int mpa_layers[4] = { -1, 2, 1, 0 };
+
+static const unsigned mpa_samples_data[3][3] = {
+	{ 384, 1152, 1152 },
+	{ 384, 1152, 576 },
+	{ 384, 1152, 576 },
+};
+
+static const unsigned mpa_bitrates[3][3][16] = { /* kb/s */
+  {
+	{ 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448 },
+	{ 0, 32, 48, 56,  64,  80,  96, 112, 128, 160, 192, 224, 256, 320, 384 },
+	{ 0, 32, 40, 48,  56,  64,  80,  96, 112, 128, 160, 192, 224, 256, 320 },
+  },
+  {
+	{ 0, 32, 48, 56,  64,  80,  96, 112, 128, 144, 160, 176, 192, 224, 256 },
+	{ 0,  8, 16, 24,  32,  40,  48,  56,  64,  80,  96, 112, 128, 144, 160 },
+	{ 0,  8, 16, 24,  32,  40,  48,  56,  64,  80,  96, 112, 128, 144, 160 },
+  },
+  {
+	{ 0, 32, 48, 56,  64,  80,  96, 112, 128, 144, 160, 176, 192, 224, 256 },
+	{ 0,  8, 16, 24,  32,  40,  48,  56,  64,  80,  96, 112, 128, 144, 160 },
+	{ 0,  8, 16, 24,  32,  40,  48,  56,  64,  80,  96, 112, 128, 144, 160 },
+  },
+};
+
+static const unsigned mpa_frequencies[3][4] = {
+	{ 44100, 48000, 32000 },
+	{ 22050, 24000, 16000 },
+	{ 11025, 12000, 8000 },
+};
+
+static const unsigned mpa_padding_data[3] = { 4, 1, 1 };
+
+int
+mpa_version(const struct mpa *mpa)
+{
+	return mpa_versions[mpa->version];
+}
+
+int
+mpa_layer(const struct mpa *mpa)
+{
+	return mpa_layers[mpa->layer];
+}
+
+unsigned
+mpa_samples(const struct mpa *mpa)
+{
+	return mpa_samples_data[mpa_versions[mpa->version]][mpa_layer(mpa)];
+}
+
+unsigned
+mpa_bitrate(const struct mpa *mpa)
+{
+	return (1000 * (mpa_bitrates[mpa_versions[mpa->version]][mpa_layers[mpa->layer]][mpa->bitrate]));
+}
+
+unsigned
+mpa_frequency(const struct mpa *mpa)
+{
+	return(mpa_frequencies[mpa_versions[mpa->version]][mpa->frequency]);
+}
+
+unsigned
+mpa_padding(const struct mpa *mpa)
+{
+	return(mpa->padding ? mpa_padding_data[mpa_layers[mpa->layer]] : 0);
+}