[Bug 762239] New: Issue processing mkv streram with wavpack audio

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=762239

            Bug ID: 762239
           Summary: Issue processing mkv streram with wavpack audio
    Classification: Platform
           Product: GStreamer
           Version: 1.4.5
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nyushchenko at dev.rtsoft.ru
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 321566
  --> https://bugzilla.gnome.org/attachment.cgi?id=321566&action=edit
first 2M of the stream

We've got an mkv file that plays perfectly with vlc but not with gstreamer.

Attached is a 2M-sized head of the file that is enough to reproduce the issue.

Attempt to extract audio stream with

gst-launch-1.0 -v filesrc location=head.mkv ! matroskademux ! wavpackparse !
wavpackdec ! alsasink

results into

Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
/GstPipeline:pipeline0/GstWavpackParse:wavpackparse0.GstPad:sink: caps =
"audio/x-wavpack\,\ width\=\(int\)32\,\ framed\=\(boolean\)true\,\
channels\=\(int\)2\,\ rate\=\(int\)48000"

(gst-launch-1.0:20800): GStreamer-CRITICAL **: gst_memory_unmap: assertion
'info->memory == mem' failed

(gst-launch-1.0:20800): GStreamer-CRITICAL **: gst_memory_unmap: assertion
'info->memory == mem' failed

(gst-launch-1.0:20800): GStreamer-CRITICAL **: gst_memory_unmap: assertion
'info->memory == mem' failed

...

(gst-launch-1.0:20800): GStreamer-CRITICAL **: gst_memory_unmap: assertion
'info->memory == mem' failed
ERROR: from element /GstPipeline:pipeline0/GstWavpackParse:wavpackparse0: No
valid frames found before end of stream
Additional debug info:
gstbaseparse.c(1155): gst_base_parse_sink_event_default ():
/GstPipeline:pipeline0/GstWavpackParse:wavpackparse0
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...


Video stream extracts successfully with

gst-launch-1.0 filesrc location=head.mkv ! matroskademux ! avdec_h264 !
xvimagesink

although same assertions are continuously printed.

Attempt to play entire file with playbin gives deadlock inside decodebin: no
valid audio data does not allow decodebin to complete audio stream format
detection, thus it keeps output video pad locked, queue overflows and things
block.  Deadlock can't be reproduced with 2M header, more data is needed,
however this is obvious secondary issue.  Root cause is in failure to extract
audio stream, which is reproducible on 2M header.

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