summaryrefslogtreecommitdiffstats
path: root/include/media/dvb_math.h
diff options
context:
space:
mode:
authorMauro Carvalho Chehab <mchehab@s-opensource.com>2017-12-28 13:03:51 -0500
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2017-12-28 13:16:01 -0500
commitfada1935590f66dc6784981e0d557ca09013c847 (patch)
treefa25e193d115d7f5f5f751de64c3eac362d21085 /include/media/dvb_math.h
parenta114a585be4f3173fe454921a0918fb7e71633b0 (diff)
downloadlinux-fada1935590f66dc6784981e0d557ca09013c847.tar.bz2
media: move dvb kAPI headers to include/media
Except for DVB, all media kAPI headers are at include/media. Move the headers to it. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'include/media/dvb_math.h')
-rw-r--r--include/media/dvb_math.h66
1 files changed, 66 insertions, 0 deletions
diff --git a/include/media/dvb_math.h b/include/media/dvb_math.h
new file mode 100644
index 000000000000..8690ec42954d
--- /dev/null
+++ b/include/media/dvb_math.h
@@ -0,0 +1,66 @@
+/*
+ * dvb-math provides some complex fixed-point math
+ * operations shared between the dvb related stuff
+ *
+ * Copyright (C) 2006 Christoph Pfister (christophpfister@gmail.com)
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+ */
+
+#ifndef __DVB_MATH_H
+#define __DVB_MATH_H
+
+#include <linux/types.h>
+
+/**
+ * intlog2 - computes log2 of a value; the result is shifted left by 24 bits
+ *
+ * @value: The value (must be != 0)
+ *
+ * to use rational values you can use the following method:
+ *
+ * intlog2(value) = intlog2(value * 2^x) - x * 2^24
+ *
+ * Some usecase examples:
+ *
+ * intlog2(8) will give 3 << 24 = 3 * 2^24
+ *
+ * intlog2(9) will give 3 << 24 + ... = 3.16... * 2^24
+ *
+ * intlog2(1.5) = intlog2(3) - 2^24 = 0.584... * 2^24
+ *
+ *
+ * return: log2(value) * 2^24
+ */
+extern unsigned int intlog2(u32 value);
+
+/**
+ * intlog10 - computes log10 of a value; the result is shifted left by 24 bits
+ *
+ * @value: The value (must be != 0)
+ *
+ * to use rational values you can use the following method:
+ *
+ * intlog10(value) = intlog10(value * 10^x) - x * 2^24
+ *
+ * An usecase example:
+ *
+ * intlog10(1000) will give 3 << 24 = 3 * 2^24
+ *
+ * due to the implementation intlog10(1000) might be not exactly 3 * 2^24
+ *
+ * look at intlog2 for similar examples
+ *
+ * return: log10(value) * 2^24
+ */
+extern unsigned int intlog10(u32 value);
+
+#endif