[gstreamer-bugs] [Bug 615819] New: [testing] audio timestamp stream generator and detector

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=615819
  GStreamer | don't know | git

           Summary: [testing] audio timestamp stream generator and
                    detector
    Classification: Desktop
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: don't know
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: bilboed at gmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


Currently, in order to test the correctness of timestamp handling for various
audio elements we only rely on the GstBuffer timestamps.

The problem with this is that we rely on the fact that all elements properly
handle/read/set/modify buffer timestamps properly. And that's the only thing we
use to check for errors/regressions/stream-validity in unit-tests. In other
words... lots of errors can be introduced which can't be detected by any other
means than by human detection.

In order to properly verify the correctness of audio elements, we need
* an audio generating element (maybe an extra mode to audiotestsrc?) that will
create a pattern *in* the stream which embeds the timestamp with a more or less
good accuracy.
* an audio pattern detection element that can detect those embedded timestamps
in buffers and emit messages accordingly ("at this stream running time I saw
this original timestamp").

That pattern should:
* be more or less robust to rate/depth conversion
* have a sync point that is as accurate as possible (to detect shifts by a few
samples),
* contain the full timestamp information within as little samples as possible,
either before or after the sync point
* *ideally* be resistant to various audio encoding techniques (so we can still
detect the pattern after a encode/decode pass)

Keywords for searching relevant documentation/material : watermarking,
fingerprinting

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