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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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67 lines
2.9 KiB
Plaintext
67 lines
2.9 KiB
Plaintext
A basclass for audiovisualizers. Takes care of re-fitting the audio-rate to
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video-rate. It receives audio-data at the sampling-rate. It needs to render
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video-frames at frame-rate. The rendering needs n audio samples (depends on
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subclass). The baseclass takes care of that.
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Some effects could be enhanced by running geometrictransform elements
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afterwards. A blur and/or videozoom element would be great (vertigotv looks
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great but has some negotiation issues).
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= Feedback =
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* put 'Audio' to klass as well ?
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= API =
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* we have a couple of drawing helpers in gstdrawhelpers.h
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(would be nice if we could use cairo)
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draw_point (x,y,color);
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draw_line (x1,x2,y1,y2,color);
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* some more we could add:
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draw_hline (x1,x2,y,color);
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draw_vline (x,y1,y2,color);
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draw_rect (x1,x2,y1,y2,color);
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draw_box (x1,x2,y1,y2,color); // filled
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* shading effects
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- would be nice to use a generic 3x3 matrix operation, we don't run inplace
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anyway
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- this way we could also blur the background
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= Elements to port =
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gst-plugin-ugly/gst/synaestesia -> synaescope
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gst-plugin-bad/gst/smoothwave -> wavescope
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gst-plugin-good/gst/monoscope -> blend into what we have in wavescope
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= Elements to add =
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spectrascope - done
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spacescope - stereo wavescope
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- left->x, right->y - done
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- polar mapping
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multiscope :
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- like wave/space scope, but run the signal through two filters to split it into
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bass, mid and high (200 Hz, 2000 Hz)
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- draw 3 wave-scopes into red/gree/blue
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- when drawing only draw that component to mix colors
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- eventually use the spacescope-position to rotate/shift the wave
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= TODO =
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- element maker template
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- test for baseclass
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= Test it =
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GST_DEBUG="*:2,*scope*:4"
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GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-inspect scopes
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GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch audiotestsrc ! audioconvert ! wavescope ! colorspace ! ximagesink
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GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch filesrc location=$HOME/Music/1.mp3 ! decodebin2 ! audioconvert ! wavescope ! colorspace ! ximagesink
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GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch filesrc location=$HOME/Music/1.mp3 ! decodebin2 ! audioconvert ! spacescope style=lines shade-amount=0x00080402 ! ximagesink
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GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch filesrc location=$HOME/Music/1.mp3 ! decodebin2 ! audioconvert ! spacescope style=lines shade-amount=0x00080402 ! vertigotv ! ximagesink
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GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch filesrc location=$HOME/Music/1.mp3 ! decodebin2 ! audioconvert ! spectrascope ! colorspace ! ximagesink
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GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD gst-launch filesrc location=$HOME/Music/1.mp3 ! decodebin2 ! audioconvert ! spectrascope shader=fade-and-move-up shade-amount=0x00040302 ! colorspace ! ximagesink
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GST_PLUGIN_PATH=$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
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