VoIP dialogs: Performance improvements

Retap and UI response are much faster when many RTP streams are
processed. RTP Streams/Analyse 1000+, RTP Player 500+.

Changes:
- RTP streams are searched with hash, not by iterating over list.
- UI operations do not redraw screen after every change, just after all
  changes. UI is locked when rereading packets.
- Sample list during RTP decoding is stored in memory so wireshark uses
  just half of opened files for audio decoding than before.
- Analysis window checkbox area is limited in height
- Dialogs shows shows count of streams, count of selected streams and
  count of unmuted streams
- Documentation extended with chapter about RTP decoding parameters
- Documentation extended with performance estimates

1 files changed, 3 insertions, 2 deletions

diff --git a/ui/qt/rtp_audio_stream.cpp b/ui/qt/rtp_audio_stream.cpp
index 5fc8d1c9f5..41a848ed1d 100644
--- a/ui/qt/rtp_audio_stream.cpp
+++ b/ui/qt/rtp_audio_stream.cpp
@@ -36,6 +36,7 @@
 #include <QVariant>
 #include <QTimer>
 #include <QDebug>
+#include <QBuffer>
 
 // To do:
 // - Only allow one rtpstream_info_t per RtpAudioStream?
@@ -80,7 +81,7 @@ RtpAudioStream::RtpAudioStream(QObject *parent, rtpstream_info_t *rtpstream, boo
         qWarning() << "Can't create temp file in " << tempname;
         throw -1;
     }
-    sample_file_frame_ = new QTemporaryFile(tempname, this);
+    sample_file_frame_ = new QBuffer(this);
     if (! sample_file_frame_->open(QIODevice::ReadWrite)) {
         // We are out of file resources
         delete sample_file_;
@@ -179,7 +180,7 @@ void RtpAudioStream::reset(double global_start_time)
     if (!sample_file_->open(QIODevice::ReadWrite)) {
         qWarning() << "Can't create temp file in " << tempname << " during retap";
     }
-    sample_file_frame_ = new QTemporaryFile(tempname, this);
+    sample_file_frame_ = new QBuffer(this);
     if (!sample_file_frame_->open(QIODevice::ReadWrite)) {
         qWarning() << "Can't create temp file in " << tempname << " during retap";
     }