From b4e22218e61fc4667a06dcf9bd71ced2835e97b8 Mon Sep 17 00:00:00 2001
From: oparviai <oparviai@f3a24b6a-cf45-0410-b55a-8c22e2698227>
Date: Thu, 30 Aug 2012 16:30:13 +0000
Subject: [PATCH] Added utility function to get elapsed duration i.e. how much
 so far has been read from the WAV file

---
 source/SoundStretch/WavFile.cpp |  8 ++++++++
 source/SoundStretch/WavFile.h   | 10 +++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/source/SoundStretch/WavFile.cpp b/source/SoundStretch/WavFile.cpp
index 3c4406b..7bc482a 100644
--- a/source/SoundStretch/WavFile.cpp
+++ b/source/SoundStretch/WavFile.cpp
@@ -651,6 +651,14 @@ uint WavInFile::getLengthMS() const
 }
 
 
+/// Returns how many milliseconds of audio have so far been read from the file
+uint WavInFile::getElapsedMS() const
+{
+    return (uint)(1000.0 * (double)dataRead / (double)header.format.byte_rate);
+}
+
+
+
 //////////////////////////////////////////////////////////////////////////////
 //
 // Class WavOutFile
diff --git a/source/SoundStretch/WavFile.h b/source/SoundStretch/WavFile.h
index cde1079..3a47352 100644
--- a/source/SoundStretch/WavFile.h
+++ b/source/SoundStretch/WavFile.h
@@ -116,8 +116,11 @@ private:
     /// File pointer.
     FILE *fptr;
 
+    /// Position within the audio stream
+    long position;
+
     /// Counter of how many bytes of sample data have been read from the file.
-    uint dataRead;
+    long dataRead;
 
     /// WAV header information
     WavHeader header;
@@ -175,6 +178,11 @@ public:
     /// Get the audio file length in milliseconds
     uint getLengthMS() const;
 
+    /// Returns how many milliseconds of audio have so far been read from the file
+    ///
+    /// \return elapsed duration in milliseconds
+    uint getElapsedMS() const;
+
     /// Reads audio samples from the WAV file. This routine works only for 8 bit samples.
     /// Reads given number of elements from the file or if end-of-file reached, as many 
     /// elements as are left in the file.