[Bug 781135] New: aacparse: incorrect sampling rate in ADTS header for SBR streams

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=781135

            Bug ID: 781135
           Summary: aacparse: incorrect sampling rate in ADTS header for
                    SBR streams
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: bugzilla at ashley-family.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

An HE-AAC stream contains an AAC-LC stream that uses a given sampling frequency
combined with an AAC-SBR enhancement layer that is used to double the sampling
frequency of the AAC-LC layer.

When generating ADTS headers, the sampling frequency of the AAC-LC stream
should be used, so that AAC decoders that only understand the LC layer can
correctly decode them.

Currently aacparse is using the extended sampling rate (either from caps or
parsing LOAS) when generating the ADTS header. For example an HE-AAC stream
that contains a 24KHz AAC-LC stream plus SBR data to convert it to 48KHz should
have the sampling frequency index field of the ADTS header set to 24KHz (to
match the AAC-LC stream) but currently it is being set to 48KHz. This causes
the stream to fail to decode.

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