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audiotestsrc - GStreamer
https://gstreamer.freedesktop.org/documentation/audiotestsrc/index.html#:~:text=gst-launch-1.0%20audiotestsrc%20wave%3Dticks%20apply-tick-ramp%3Dtrue%20tick-interval%3D100000000%20%20freq%3D10000%20volume%3D0.4,100%20ms%20and%20have%20a%20volume%20of%200.4.
audiotestsrc - GStreamer
https://gstreamer.freedesktop.org/documentation/audiotestsrc/index.html
Volume sets the standard deviation of the noise in units of the range of values of the sample type, e.g. volume=0.1 produces noise with a standard deviation of 0.1 32767=3277 with 16-bit integer samples, or 0.1 1.0=0.1 with floating-point samples. Ticks This waveform is special in that it does not produce one continuous signal.
audiotestsrc - Massachusetts Institute of Technology
https://stuff.mit.edu/afs/athena/system/amd64_deb50/os/usr/share/gtk-doc/html/gst-plugins-base-plugins-0.10/gst-plugins-base-plugins-audiotestsrc.html
AudioTestSrc can be used to generate basic audio signals. different waveforms and allows to set the base frequency and volume. Example launch line gst-launch audiotestsrc ! audioconvert ! alsasink This pipeline produces a sine with default frequency, 440 Hz, and the default volume, 0.8 (relative to a maximum 1.0).
volume - GStreamer
https://gstreamer.freedesktop.org/documentation/volume/index.html
volume The volume element changes the volume of the audio data. Example launch line gst-launch-1.0 -v -m audiotestsrc ! volume volume=0.5 ! level ! fakesink silent=TRUE This pipeline shows that the level of audiotestsrc has been halved (peak values are around -6 dB and RMS around -9 dB) compared to the same pipeline without the volume element.
audiotestsrc - freedesktop.org
https://www.freedesktop.org/software/gstreamer-sdk/data/docs/2012.5/gst-plugins-base-plugins-0.10/gst-plugins-base-plugins-audiotestsrc.html
1 gst-launch audiotestsrc ! audioconvert ! alsasink This pipeline produces a sine with default frequency, 440 Hz, and the default volume, 0.8 (relative to a maximum 1.0). 1 gst-launch audiotestsrc wave=2 freq=200 ! audioconvert ! tee name=t ! queue ! alsasink t. ! queue ! libvisual_lv_scope ! ffmpegcolorspace ! xvimagesink
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