Gstreamer

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Note: gstreamer has only been introduced recently in Buildroot, so you will need to use our "still in development" migration to Buildroot 2010.xx version.

Installation

$ make menuconfig

Package Selection for the target  --->
    Audio and video libraries and applications  --->
        ...
        [*] gstreamer
        [*]   require libxml2 for registry and load/save
        -*-   gst-plugins-base  --->
        [*]   gst-plugins-good  --->
        [*]   gst-plugins-bad  --->
        [*]   gst-plugins-ugly  --->

Plugins worth to activate:

• base:
• good:
• bad:
• ugly:

Usage

Check installed plugins

• To see all installed plugins:

# gst-inspect
videoscale:  videoscale: Video scaler
queue2:  queue2: Queue               
ffmpegcolorspace:  ffmpegcolorspace: FFMPEG Colorspace converter
audiorate:  audiorate: Audio rate adjuster                      
audioconvert:  audioconvert: Audio converter                    
audioresample:  audioresample: Audio resampler                  
volume:  volume: Volume
...

• To have more details about one particular plugin (here alsasrc):

# gst-inspect alsasrc
Factory Details:     
  Long name:    Audio source (ALSA)
  Class:        Source/Audio       
  Description:  Read from a sound card via ALSA
  Author(s):    Wim Taymans <wim@fluendo.com>  
  Rank:         primary (256)                  

Plugin Details:
  Name:                 alsa
  Description:          ALSA plugin library
  Filename:             /usr/lib/gstreamer-0.10/libgstalsa.so
  Version:              0.10.25                              
  License:              LGPL                                 
  Source module:        gst-plugins-base                     
  Binary package:       GStreamer Base Plug-ins source release
  Origin URL:           Unknown package origin                
...
<cut>

Audio

• play a monotic tone to check your sound configuration is working (if not please configure ALSA):

# gst-launch audiotestsrc ! audioconvert ! audioresample ! alsasink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstAudioSinkClock

• play a music file (here a .ogg, supposing the libgstogg plugin was installed):

# gst-launch-0.10 filesrc location=toto.ogg ! decodebin ! audioconvert ! audioresample ! alsasink

• record a sound from a mic (APF27 only) and store it as an uncompressed wav file:

# gst-launch-0.10 alsasrc ! audioconvert ! audioresample ! wavenc ! filesink location=mic.wav

• record a sound from a mic (APF27 only) and compress it (ogg/worbis):

# gst-launch-0.10 alsasrc ! audioconvert ! audioresample ! vorbisenc ! oggmux ! filesink location=mic.ogg