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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>audiotestsrc: GStreamer Base Plugins 1.0 Plugins Reference Manual</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
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<link rel="home" href="index.html" title="GStreamer Base Plugins 1.0 Plugins Reference Manual">
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<link rel="up" href="ch01.html" title="gst-plugins-base Elements">
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<link rel="prev" href="gst-plugins-base-plugins-audioresample.html" title="audioresample">
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<link rel="next" href="gst-plugins-base-plugins-cdparanoiasrc.html" title="cdparanoiasrc">
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<meta name="generator" content="GTK-Doc V1.27 (XML mode)">
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<link rel="stylesheet" href="style.css" type="text/css">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Top |
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Description |
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Object Hierarchy |
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Properties
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audiotestsrc
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audiotestsrc
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Properties
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gboolean
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can-activate-pull
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Read / Write
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gboolean
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can-activate-push
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Read / Write
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gdouble
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freq
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Read / Write
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gboolean
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is-live
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Read / Write
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gint
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samplesperbuffer
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Read / Write
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gint64
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timestamp-offset
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Read / Write
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gdouble
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volume
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Read / Write
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GstAudioTestSrcWave
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wave
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Read / Write
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Types and Values
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struct
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GstAudioTestSrc
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enum
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GstAudioTestSrcWave
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Object Hierarchy
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GObject
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╰── GInitiallyUnowned
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╰── GstObject
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╰── GstElement
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╰── GstBaseSrc
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╰── GstAudioTestSrc
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Description
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AudioTestSrc can be used to generate basic audio signals. It support several
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different waveforms and allows to set the base frequency and volume.
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Example launch line
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1
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gst-launch-1.0 audiotestsrc ! audioconvert ! autoaudiosink
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This pipeline produces a sine with default frequency, 440 Hz, and the
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default volume, 0.8 (relative to a maximum 1.0).
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1
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gst-launch-1.0 audiotestsrc wave=2 freq=200 ! tee name=t ! queue ! audioconvert ! autoaudiosink t. ! queue ! audioconvert ! libvisual_lv_scope ! videoconvert ! autovideosink
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In this example a saw wave is generated. The wave is shown using a
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scope visualizer from libvisual, allowing you to visually verify that
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the saw wave is correct.
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Synopsis
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Element Information
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plugin
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audiotestsrc
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author
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Stefan Kost <ensonic@users.sf.net>
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class
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Source/Audio
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Element Pads
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name
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src
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direction
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source
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presence
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always
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details
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audio/x-raw, format=(string){ S16LE, S16BE, U16LE, U16BE, S24_32LE, S24_32BE, U24_32LE, U24_32BE, S32LE, S32BE, U32LE, U32BE, S24LE, S24BE, U24LE, U24BE, S20LE, S20BE, U20LE, U20BE, S18LE, S18BE, U18LE, U18BE, F32LE, F32BE, F64LE, F64BE, S8, U8 }, layout=(string)interleaved, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ]
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Functions
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Types and Values
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struct GstAudioTestSrc
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struct GstAudioTestSrc;
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audiotestsrc object structure.
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enum GstAudioTestSrcWave
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Different types of supported sound waves.
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Members
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GST_AUDIO_TEST_SRC_WAVE_SINE
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a sine wave
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GST_AUDIO_TEST_SRC_WAVE_SQUARE
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a square wave
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GST_AUDIO_TEST_SRC_WAVE_SAW
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a saw wave
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GST_AUDIO_TEST_SRC_WAVE_TRIANGLE
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a tringle wave
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GST_AUDIO_TEST_SRC_WAVE_SILENCE
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silence
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GST_AUDIO_TEST_SRC_WAVE_WHITE_NOISE
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white uniform noise
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GST_AUDIO_TEST_SRC_WAVE_PINK_NOISE
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pink noise
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GST_AUDIO_TEST_SRC_WAVE_SINE_TAB
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sine wave using a table
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GST_AUDIO_TEST_SRC_WAVE_TICKS
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periodic ticks
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GST_AUDIO_TEST_SRC_WAVE_GAUSSIAN_WHITE_NOISE
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white (zero mean) Gaussian noise; 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.
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GST_AUDIO_TEST_SRC_WAVE_RED_NOISE
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red (brownian) noise
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GST_AUDIO_TEST_SRC_WAVE_BLUE_NOISE
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spectraly inverted pink noise
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GST_AUDIO_TEST_SRC_WAVE_VIOLET_NOISE
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spectraly inverted red (brownian) noise
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Property Details
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The “can-activate-pull” property
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“can-activate-pull” gboolean
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Can activate in pull mode.
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Flags: Read / Write
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Default value: FALSE
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The “can-activate-push” property
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“can-activate-push” gboolean
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Can activate in push mode.
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Flags: Read / Write
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Default value: TRUE
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The “freq” property
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“freq” gdouble
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Frequency of test signal. The sample rate needs to be at least 4 times higher.
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Flags: Read / Write
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Allowed values: [0,5.36871e+08]
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Default value: 440
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The “is-live” property
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“is-live” gboolean
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Whether to act as a live source.
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Flags: Read / Write
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Default value: FALSE
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The “samplesperbuffer” property
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“samplesperbuffer” gint
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Number of samples in each outgoing buffer.
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Flags: Read / Write
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Allowed values: >= 1
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Default value: 1024
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The “timestamp-offset” property
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“timestamp-offset” gint64
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An offset added to timestamps set on buffers (in ns).
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Flags: Read / Write
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Default value: 0
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The “volume” property
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“volume” gdouble
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Volume of test signal.
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Flags: Read / Write
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Allowed values: [0,1]
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Default value: 0.8
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The “wave” property
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“wave” GstAudioTestSrcWave
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Oscillator waveform.
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Flags: Read / Write
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Default value: Sine
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