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39 lines
1.5 KiB
Text
39 lines
1.5 KiB
Text
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cutter plugin by thomas <thomas@apestaart.org>
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SYNOPSIS
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This plugin emits signals when RMS level of audio signal crosses a
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threshold for a given amount of time.
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As soon as the buffer's RMS is greater than the threshold value, the plugin fires a CUT_START signal.
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When the buffer's RMS level drops below the threshold value for a consecutive run length longer than the given runlength, it sends a CUT_STOP signal.
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When a pre-recording buffer is used, the plugin will delay throughput of data when it's in "silent" mode for a maximum length equal to the pre-recording buffer length. As soon as the input level crosses the threshold level, this pre-recorded buffer is flushed to the src pad (so you can actually record the audio just before the threshold crossing) after sending the signal.
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ARGUMENTS
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GstCutter::threshold
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level (between 0 and 1) of threshold
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GstCutter::threshold_dB
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level of threshold in dB (between -inf and 0)
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GstCutter::runlength
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minimum length (in seconds) before plugin sends cut_stop signal
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GstCutter::prelength
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length of pre-recording buffer
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SIGNALS
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CUT_START
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gets sent when the level of the signal goes above threshold level
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CUT_STOP
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gets sent when the level of the signal has been below the
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threshold level for a number of consecutive iterations of which
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the cumulative length is more than the runlength
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LIMITATIONS
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* RMS value is calculated over the whole data buffer, so
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the time resolution is limited to the buffer length
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* RMS value is calculated over all of the channels combined
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