[Bug 720995] matroskamux: add g726 adpcm support

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=720995
  GStreamer | gst-plugins-good | 1.x

--- Comment #8 from Nicola <lists at svrinformatica.it> 2014-01-08 10:41:09 UTC ---
Created an attachment (id=265683)
 View: https://bugzilla.gnome.org/attachment.cgi?id=265683
 Review: https://bugzilla.gnome.org/review?bug=720995&attachment=265683

fix gstreamer playback

Please note that the attached patch assume that the bitrate information in the
header is correct, for other adpcm formats there are comments such this

/* Many encoding tools create a wrong bitrate information in the
 * header, so either we calculate the bitrate or mark it as invalid
 * as this would probably confuse timing */

and the bitrate is recalculated

another note:

gst-launch-1.0 -v alsasrc num-buffers=1000 ! avenc_g726 ! fakesink silent=false

show block_align setted to 0, if I encode with libav directly block align is
set to 1

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