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audiovisualizers: add a README with comments and plans

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Stefan Kost 2011-06-04 20:41:49 +03:00
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gst/audiovisualizers/README Normal file
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A basclass for audiovisualizers. Takes care of re-fitting the audio-rate to
video-rate. It receives audio-data at the sampling-rate. It needs to render
video-frames at frame-rate. The rendering needs n audio samples (depends on
subclass). The baseclass takes care of that.
= Feedback =
* put 'Audio' to klass as well ?
= API =
* should we add some basic drawing helpers to the baseclass
draw_point (x,y,color);
draw_hline (x1,x2,y,color);
draw_vline (x,y1,y2,color);
draw_rect (x1,x2,y1,y2,color);
draw_box (x1,x2,y1,y2,color); // filled
- would be nice if we could use cairo
* shading effects
- would be nice to use a generic 3x3 matrix operation, we don't run inplace
anyway
- this way we could also blur the background
= Elements to port =
gst-plugin-ugly/gst/synaestesia -> synaescope
gst-plugin-good/gst/monoscope -> blend into what we have in wavescope
= Elements to add =
spectrascope - done
spacescope - stereo wavescope
- left->x, right->y - done
- polar mapping
= TODO =
- element maker template
- test for baseclass
= Test it =
GST_DEBUG="*:2,*scope*:4"
GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-inspect scopes
GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch audiotestsrc ! audioconvert ! wavescope ! colorspace ! ximagesink
GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch filesrc location=/home/ensonic/Musik/xotox-hypnocat.mp3 ! decodebin2 ! audioconvert ! wavescope ! colorspace ! ximagesink
GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch filesrc location=/home/ensonic/Musik/xotox-hypnocat.mp3 ! decodebin2 ! audioconvert ! spectrascope ! colorspace ! ximagesink
GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch filesrc location=/home/ensonic/Musik/Gridlock/Trace/04\ Uh4.17.mp3 ! decodebin2 ! audioconvert ! spectrascope ! colorspace ! ximagesink
GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch filesrc location=/home/ensonic/Musik/Gridlock/Trace/04\ Uh4.17.mp3 ! decodebin2 ! audioconvert ! spectrascope shader=fade-and-move-up shade-amount=0x00040302 ! colorspace ! ximagesink
GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch filesrc location=/home/ensonic/Musik/Gridlock/Trace/04\ Uh4.17.mp3 ! decodebin2 ! tee name=t ! queue ! audioconvert ! synaesthesia ! ximagesink t. ! queue ! synaescope shade-amount=0x00040404 ! colorspace ! ximagesink