|  |  |  | GStreamer Base Plugins 0.10 Plugins Reference Manual |  | 
|---|---|---|---|---|
| Top | Description | Object Hierarchy | Properties | ||||
"freq" gdouble : Read / Write "is-live" gboolean : Read / Write "samplesperbuffer" gint : Read / Write "timestamp-offset" gint64 : Read / Write "volume" gdouble : Read / Write "wave" GstAudioTestSrcWave : Read / Write "can-activate-pull" gboolean : Read / Write "can-activate-push" gboolean : Read / Write
AudioTestSrc can be used to generate basic audio signals. It support several different waveforms and allows to set the base frequency and volume.
gst-launch audiotestsrc ! audioconvert ! alsasink
gst-launch audiotestsrc wave=2 freq=200 ! audioconvert ! tee name=t ! queue ! alsasink t. ! queue ! libvisual_lv_scope ! ffmpegcolorspace ! xvimagesink
| plugin | audiotestsrc | 
| author | Stefan Kost <ensonic@users.sf.net> | 
| class | Source/Audio | 
| name | src | 
| direction | source | 
| presence | always | 
| details | audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)16, depth=(int)16, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2 ] | 
| audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)32, depth=(int)32, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2 ] | |
| audio/x-raw-float, endianness=(int)1234, width=(int){ 32, 64 }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2 ] | 
| plugin | audiotestsrc | 
| author | Stefan Kost <ensonic@users.sf.net> | 
| class | Source/Audio | 
| name | src | 
| direction | source | 
| presence | always | 
| details | audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)16, depth=(int)16, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2 ] | 
| audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)32, depth=(int)32, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2 ] | |
| audio/x-raw-float, endianness=(int)1234, width=(int){ 32, 64 }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2 ] | 
typedef enum {
  GST_AUDIO_TEST_SRC_WAVE_SINE,
  GST_AUDIO_TEST_SRC_WAVE_SQUARE,
  GST_AUDIO_TEST_SRC_WAVE_SAW,
  GST_AUDIO_TEST_SRC_WAVE_TRIANGLE,
  GST_AUDIO_TEST_SRC_WAVE_SILENCE,
  GST_AUDIO_TEST_SRC_WAVE_WHITE_NOISE,
  GST_AUDIO_TEST_SRC_WAVE_PINK_NOISE,
  GST_AUDIO_TEST_SRC_WAVE_SINE_TAB,
  GST_AUDIO_TEST_SRC_WAVE_TICKS,
  GST_AUDIO_TEST_SRC_WAVE_GAUSSIAN_WHITE_NOISE
} GstAudioTestSrcWave; 
Different types of supported sound waves.
| a sine wave | |
| a square wave | |
| a saw wave | |
| a tringle wave | |
| silence | |
| white uniform noise | |
| pink noise | |
| sine wave using a table | |
| periodic ticks | |
| 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. | 
"freq" property"freq" gdouble : Read / Write
Frequency of test signal.
Allowed values: [0,20000]
Default value: 440
"is-live" property"is-live" gboolean : Read / Write
Whether to act as a live source.
Default value: FALSE
"samplesperbuffer" property"samplesperbuffer" gint : Read / Write
Number of samples in each outgoing buffer.
Allowed values: >= 1
Default value: 1024
"timestamp-offset" property"timestamp-offset" gint64 : Read / Write
An offset added to timestamps set on buffers (in ns).
Default value: 0
"volume" property"volume" gdouble : Read / Write
Volume of test signal.
Allowed values: [0,1]
Default value: 0.8
"wave" property"wave" GstAudioTestSrcWave : Read / Write
Oscillator waveform.
Default value: Sine
"can-activate-pull" property"can-activate-pull" gboolean : Read / Write
Can activate in pull mode.
Default value: FALSE
"can-activate-push" property"can-activate-push" gboolean : Read / Write
Can activate in push mode.
Default value: TRUE