summaryrefslogtreecommitdiffstats
path: root/v4l/kernel-2.6.tmp/dvb_math.h
diff options
context:
space:
mode:
authorOliver Schinagl <oliver@schinagl.nl>2011-06-28 13:40:27 (GMT)
committerOliver Schinagl <oliver@schinagl.nl>2011-06-28 13:40:27 (GMT)
commitfecdd9457cd3912c2b89aff1f99db0ba669af93b (patch)
tree34bbc7387ded825e303c3117b6c6da2cbe1fd771 /v4l/kernel-2.6.tmp/dvb_math.h
downloadAF903x_SRC-fecdd9457cd3912c2b89aff1f99db0ba669af93b.zip
AF903x_SRC-fecdd9457cd3912c2b89aff1f99db0ba669af93b.tar.gz
AF903x_SRC-fecdd9457cd3912c2b89aff1f99db0ba669af93b.tar.bz2
Initial checkin' of sourceball extracted from installer.
DRIVER_RELEASE_VERSION : v9.08.14.1 FW_RELEASE_VERSION : v8_8_63_0 API_RELEASE_VERSION : 200.20090402.0 Not sure what those version numbers relate to. Might be Driver, the actual driver (src) FW, the little bin file that is only a keymapping for the remote API, all the tuners or so from /api? No support for Asus U3100 mini (yet).
Diffstat (limited to 'v4l/kernel-2.6.tmp/dvb_math.h')
-rw-r--r--v4l/kernel-2.6.tmp/dvb_math.h58
1 files changed, 58 insertions, 0 deletions
diff --git a/v4l/kernel-2.6.tmp/dvb_math.h b/v4l/kernel-2.6.tmp/dvb_math.h
new file mode 100644
index 0000000..aecc867
--- /dev/null
+++ b/v4l/kernel-2.6.tmp/dvb_math.h
@@ -0,0 +1,58 @@
+/*
+ * 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.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef __DVB_MATH_H
+#define __DVB_MATH_H
+
+#include <linux/types.h>
+
+/**
+ * computes log2 of a value; the result is shifted left by 24 bits
+ *
+ * to use rational values you can use the following method:
+ * intlog2(value) = intlog2(value * 2^x) - x * 2^24
+ *
+ * example: intlog2(8) will give 3 << 24 = 3 * 2^24
+ * example: intlog2(9) will give 3 << 24 + ... = 3.16... * 2^24
+ * example: intlog2(1.5) = intlog2(3) - 2^24 = 0.584... * 2^24
+ *
+ * @param value The value (must be != 0)
+ * @return log2(value) * 2^24
+ */
+extern unsigned int intlog2(u32 value);
+
+/**
+ * computes log10 of a value; the result is shifted left by 24 bits
+ *
+ * to use rational values you can use the following method:
+ * intlog10(value) = intlog10(value * 10^x) - x * 2^24
+ *
+ * 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
+ *
+ * @param value The value (must be != 0)
+ * @return log10(value) * 2^24
+ */
+extern unsigned int intlog10(u32 value);
+
+#endif