[Bug 779805] New: Add SND_PCM_FORMAT_DSD series to alsasink

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779805

            Bug ID: 779805
           Summary: Add  SND_PCM_FORMAT_DSD series to alsasink
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: n-matsumoto at melcoinc.co.jp
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 347558
  --> https://bugzilla.gnome.org/attachment.cgi?id=347558&action=edit
adds SND_PCM_FORMAT_DSD series

What's the patch?
===============
The patch just adds SND_PCM_FORMAT_DSD series.
SND_PCM_FORMAT_DSD was defined by alsa-lib v1.0.29.

https://www.alsa-project.org/main/index.php/Changes_v1.0.28_v1.0.29
pcm: add new 32-bit DSD sample format

Incidentally,  SND_PCM_FORMAT_LAST = SND_PCM_FORMAT_DSD_U32_BE.
It's mean follow pcm_format of alsa-lib.
http://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m.html


Howto native-dsd playback?
====================
Sorry, we can't play dsd on gstreamer now.
because, we don't have dsd decoder elements.

I confirmed combination software stack.
MPD 0.20.2+, alsa-lib v1.0.29+, kernel 3.18+ and supported sound device.
http://git.musicpd.org/cgit/master/mpd.git/plain/NEWS?h=v0.20.2

If you want to more information, Please refer to the URL
https://github.com/lintweaker/xmos-native-dsd


Technical description
=========================
* silence value is 0x69
Refer to Line106
https://www.ffmpeg.org/doxygen/2.4/dsddec_8c_source.html
* alsa-lib define
http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=src/pcm/pcm.c;h=a16fd86fb3b004ca93bb07b568c4724182d5dd61;hb=ad188bbf7813eab6f42dcdf617aa947107118857#l1800

http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=src/pcm/pcm.c;h=a16fd86fb3b004ca93bb07b568c4724182d5dd61;hb=ad188bbf7813eab6f42dcdf617aa947107118857#l1862

* other information
UsbAudioClass3.0 define DSD format
2.3.1.6.5 DSD FORMAT
Frmts30.pdf at USB Audio Devices Rev. 3.0 Spec and Adopters Agreement 
http://www.usb.org/developers/docs/devclass_docs/


My first send patch to Gstreamer community.
Let me know anything problems.
Thank you.

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