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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.
Some effects could be enhanced by running geometrictransform/effecttc elements
afterwards.
= Feedback =
* put 'Audio' to klass as well ?
= API =
* we have a couple of drawing helpers in gstdrawhelpers.h
(would be nice if we could use cairo)
draw_point (x,y,color);
draw_line (x1,x2,y1,y2,color);
* some more we could add:
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
* 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
- we need to handle visualizer that don't draw with alpha:
- add API to set can_mix and if so enable shaders
- ev. do mixing ourself (needs extra buffer)
= Elements to port =
gst-plugins-ugly/gst/synaestesia -> synaescope
gst-plugins-bad/gst/smoothwave -> wavescope
gst-plugins-good/gst/monoscope -> blend into what we have in wavescope
- it keeps an array of the values we just showed last[width]
- each audio-buffer is 2*width
- it uses convolution to finde the best match in current[2*width] compared to
last[width]
- then it shows current[match ... match+width] and copies it into last
gst-plugins-base/ext/libvisual - done
= Elements to add =
spectrascope - done
spacescope - stereo wavescope
- left->x, right->y - done
- polar mapping
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
- actors
- we use the wave, filtered waves, balance and fft so far
- we could have narrow filters over harmonic frequencies
- we could use loudness like determined in level-meter
- 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"
GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-inspect scopes
== 0.10 ==
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
GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch filesrc location=$HOME/Music/1.mp3 ! decodebin2 ! audioconvert ! spectrascope ! colorspace ! ximagesink
GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch filesrc location=$HOME/Music/1.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=$HOME/Music/1.mp3 ! decodebin2 ! tee name=t ! queue ! audioconvert ! synaesthesia ! ximagesink t. ! queue ! synaescope shade-amount=0x00040404 ! colorspace ! ximagesink
== 0.11/1.0 ==
gst-launch-1.0 audiotestsrc ! audioconvert ! wavescope ! videoconvert ! ximagesink
gst-launch-1.0 filesrc location=$HOME/Music/1.mp3 ! decodebin ! audioconvert ! spectrascope ! videoconvert ! ximagesink
gst-launch-1.0 filesrc location=$HOME/Music/1.mp3 ! decodebin ! tee name=t ! queue ! audioconvert ! wavescope style=color-lines shade-amount=0x00080402 ! alpha alpha=0.5 ! videomixer name=m background=black ! videoconvert ! vertigotv ! ximagesink t. ! queue ! audioconvert ! spacescope style=color-lines shade-amount=0x00080402 ! alpha alpha=0.5 ! m. t. ! queue ! autoaudiosink
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