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audiovisualizer: update README

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This commit is contained in:
Stefan Sauer 2011-11-30 15:13:04 +01:00
parent 11590ac0b6
commit 00ac111477
1 changed files with 27 additions and 9 deletions
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36
gst/audiovisualizers/README
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@ -3,9 +3,8 @@ 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.
Some effects could be enhanced by running geometrictransform elements
afterwards. A blur and/or videozoom element would be great (vertigotv looks
great but has some negotiation issues).
Some effects could be enhanced by running geometrictransform/effecttc elements
afterwards.
= Feedback =
* put 'Audio' to klass as well ?
@ -36,17 +35,35 @@ spectrascope - done
spacescope - stereo wavescope
- left->x, right->y - done
- polar mapping
multiscope :
- like wave/space scope, but run the signal through two filters to split it into
bass, mid and high (200 Hz, 2000 Hz)
- draw 3 wave-scopes into red/gree/blue
- when drawing only draw that component to mix colors
- eventually use the spacescope-position to rotate/shift the wave
wavescope
- we could have a bouncing line as a base, like a quix:
- two dots moving on a linear path and getting a new random dx,dy when hitting
a border
- the abs(dx/dy) - speed of movement - could be scaled by the sound level
- we would need to rotate, stretch and clip the waveform drawing to fit the
line
- we could scratch the rotate part and just stretch/squeeze x and shift/clip y
xxxscope
- have a matrix of source and drawing-functions
- sources: audio, spectrum, audio-low, audio-mid, audio-hi
- drawing: waves (style, color), space (style,color)
- have the usual shade and move operations
- have a way to draw each operator in one or more color-channels
- we could calculate the sound-level (like in level element) and modulate
colors/movements
- for filtered low/mid/hi audio we could use different peak-falloffs
= TODO =
- element maker template
- test for baseclass
- we probably want a VisBin like the gnome video effects
- this way we can specify pipeline fragments
- VisBin can use a videomixer to switch effects based on time or song
- VisBin can e.g. control a text-overlay to render the title into the
visualisation for a while
= Test it =
GST_DEBUG="*:2,*scope*:4"
@ -55,6 +72,7 @@ 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=$HOME/Music/1.mp3 ! decodebin2 ! audioconvert ! wavescope ! colorspace ! ximagesink
GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch filesrc location=$HOME/Music/1.mp3 ! decodebin2 ! audioconvert ! wavescope style=lines shade-amount=0x00080402 ! edgetv ! vertigotv ! ximagesink
GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch filesrc location=$HOME/Music/1.mp3 ! decodebin2 ! audioconvert ! spacescope style=lines shade-amount=0x00080402 ! ximagesink
GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch filesrc location=$HOME/Music/1.mp3 ! decodebin2 ! audioconvert ! spacescope style=lines shade-amount=0x00080402 ! vertigotv ! ximagesink