From 8aa0ef87aecc9f5343d668f34002611bc2e0bdb2 Mon Sep 17 00:00:00 2001
From: yomguy <>
Date: Wed, 31 Dec 2008 17:29:04 +0000
Subject: [PATCH] add Mean DC shift analyzer, fix duration analysis, cleanup

---
 telemeta/analysis/__init__.py   |  1 +
 telemeta/analysis/dc.py         | 31 +++++++++++++++++++++++++++++++
 telemeta/analysis/duration.py   |  2 +-
 telemeta/analysis/mean_level.py |  1 -
 4 files changed, 33 insertions(+), 2 deletions(-)
 create mode 100644 telemeta/analysis/dc.py

diff --git a/telemeta/analysis/__init__.py b/telemeta/analysis/__init__.py
index 748879ee..080b2749 100644
--- a/telemeta/analysis/__init__.py
+++ b/telemeta/analysis/__init__.py
@@ -8,5 +8,6 @@ from telemeta.analysis.samplerate import *
 from telemeta.analysis.duration import *
 from telemeta.analysis.max_level import *
 from telemeta.analysis.mean_level import *
+from telemeta.analysis.dc import *
 
 
diff --git a/telemeta/analysis/dc.py b/telemeta/analysis/dc.py
new file mode 100644
index 00000000..9f3c083c
--- /dev/null
+++ b/telemeta/analysis/dc.py
@@ -0,0 +1,31 @@
+# Copyright (C) 2008 Parisson SARL
+# All rights reserved.
+#
+# This software is licensed as described in the file COPYING, which
+# you should have received as part of this distribution. The terms
+# are also available at http://svn.parisson.org/telemeta/TelemetaLicense.
+#
+# Author: Guillaume Pellerin <yomguy@parisson.com>
+
+from telemeta.analysis.core import *
+from telemeta.analysis.api import IMediaItemAnalyzer
+import numpy
+
+class MeanDCShiftAnalyser(AudioProcessor):
+    """Media item analyzer driver interface"""
+
+    implements(IMediaItemAnalyzer)
+
+    def get_id(self):
+        return "dc"
+
+    def get_name(self):
+        return "Mean DC shift"
+
+    def get_unit(self):
+        return "%"
+
+    def render(self, media_item, options=None):
+        self.pre_process(media_item)
+        samples = self.get_mono_samples()
+        return numpy.round(100*numpy.mean(samples),4)
diff --git a/telemeta/analysis/duration.py b/telemeta/analysis/duration.py
index a215b78a..41c1eb89 100644
--- a/telemeta/analysis/duration.py
+++ b/telemeta/analysis/duration.py
@@ -28,5 +28,5 @@ class DurationAnalyzer(AudioProcessor):
 
     def render(self, media_item, options=None):
         self.pre_process(media_item)
-        media_time = numpy.round(float(self.frames)/(float(self.samplerate)*float(self.channels)),0)
+        media_time = numpy.round(float(self.frames)/float(self.samplerate),0)
         return datetime.timedelta(0,media_time)
diff --git a/telemeta/analysis/mean_level.py b/telemeta/analysis/mean_level.py
index 630080d9..aeb5e16d 100644
--- a/telemeta/analysis/mean_level.py
+++ b/telemeta/analysis/mean_level.py
@@ -28,5 +28,4 @@ class MeanLevelAnalyser(AudioProcessor):
     def render(self, media_item, options=None):
         self.pre_process(media_item)
         samples = self.get_mono_samples()
-        size = numpy.size(samples)
         return numpy.round(20*numpy.log10(numpy.mean(numpy.sqrt(numpy.square(samples)))),2)
-- 
2.39.5