1 files changed, 85 insertions, 0 deletions
diff --git a/src/utils/BitstreamStats.cpp b/src/utils/BitstreamStats.cpp
new file mode 100644
index 0000000000..af325e91b1
--- /dev/null
+++ b/src/utils/BitstreamStats.cpp
@@ -0,0 +1,85 @@
+/*
+ *      Copyright (C) 2005-2013 Team XBMC
+ *      http://xbmc.org
+ *
+ *  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, 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 XBMC; see the file COPYING.  If not, see
+ *  <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "BitstreamStats.h"
+#include "utils/TimeUtils.h"
+
+int64_t BitstreamStats::m_tmFreq;
+
+BitstreamStats::BitstreamStats(unsigned int nEstimatedBitrate)
+{
+  m_dBitrate = 0.0;
+  m_dMaxBitrate = 0.0;
+  m_dMinBitrate = -1.0;
+
+  m_nBitCount = 0;
+  m_nEstimatedBitrate = nEstimatedBitrate;
+  m_tmStart = 0LL;
+
+  if (m_tmFreq == 0LL)
+    m_tmFreq = CurrentHostFrequency();
+}
+
+BitstreamStats::~BitstreamStats()
+{
+}
+
+void BitstreamStats::AddSampleBytes(unsigned int nBytes)
+{
+  AddSampleBits(nBytes*8);
+}
+
+void BitstreamStats::AddSampleBits(unsigned int nBits)
+{
+  m_nBitCount += nBits;
+  if (m_nBitCount >= m_nEstimatedBitrate)
+    CalculateBitrate();
+}
+
+void BitstreamStats::Start()
+{
+  m_nBitCount = 0;
+  m_tmStart = CurrentHostCounter();
+}
+
+void BitstreamStats::CalculateBitrate()
+{
+  int64_t tmNow;
+  tmNow = CurrentHostCounter();
+
+  double elapsed = (double)(tmNow - m_tmStart) / (double)m_tmFreq;
+  // only update once every 2 seconds
+  if (elapsed >= 2)
+  {
+    m_dBitrate = (double)m_nBitCount / elapsed;
+
+    if (m_dBitrate > m_dMaxBitrate)
+      m_dMaxBitrate = m_dBitrate;
+
+    if (m_dBitrate < m_dMinBitrate || m_dMinBitrate == -1)
+      m_dMinBitrate = m_dBitrate;
+
+    Start();
+  }
+}
+
+
+
+