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GStreamer Base Plugins 0.10 Plugins Reference Manual | ![]() |
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Top | Description | Object Hierarchy | Properties |
GObject +----GstObject +----GstElement +----GstBaseSrc +----GstPushSrc +----GstVideoTestSrc
"pattern" GstVideoTestSrcPattern : Read / Write "timestamp-offset" gint64 : Read / Write "is-live" gboolean : Read / Write "peer-alloc" gboolean : Read / Write "colorspec" GstVideoTestSrcColorSpec : Read / Write "k0" gint : Read / Write "kt" gint : Read / Write "kt2" gint : Read / Write "kx" gint : Read / Write "kx2" gint : Read / Write "kxt" gint : Read / Write "kxy" gint : Read / Write "ky" gint : Read / Write "ky2" gint : Read / Write "kyt" gint : Read / Write "xoffset" gint : Read / Write "yoffset" gint : Read / Write
The videotestsrc element is used to produce test video data in a wide variaty of formats. The video test data produced can be controlled with the "pattern" property.
typedef enum { GST_VIDEO_TEST_SRC_SMPTE, GST_VIDEO_TEST_SRC_SNOW, GST_VIDEO_TEST_SRC_BLACK, GST_VIDEO_TEST_SRC_WHITE, GST_VIDEO_TEST_SRC_RED, GST_VIDEO_TEST_SRC_GREEN, GST_VIDEO_TEST_SRC_BLUE, GST_VIDEO_TEST_SRC_CHECKERS1, GST_VIDEO_TEST_SRC_CHECKERS2, GST_VIDEO_TEST_SRC_CHECKERS4, GST_VIDEO_TEST_SRC_CHECKERS8, GST_VIDEO_TEST_SRC_CIRCULAR, GST_VIDEO_TEST_SRC_BLINK, GST_VIDEO_TEST_SRC_SMPTE75, GST_VIDEO_TEST_SRC_ZONE_PLATE, GST_VIDEO_TEST_SRC_GAMUT, GST_VIDEO_TEST_SRC_CHROMA_ZONE_PLATE, GST_VIDEO_TEST_SRC_SOLID, GST_VIDEO_TEST_SRC_BALL, GST_VIDEO_TEST_SRC_SMPTE100, GST_VIDEO_TEST_SRC_BAR } GstVideoTestSrcPattern;
The test pattern to produce.
The Gamut pattern creates a checkerboard pattern of colors at the edge of the YCbCr gamut and nearby colors that are out of gamut. The pattern is divided into 4 regions: black, white, red, and blue. After conversion to RGB, the out-of-gamut colors should be converted to the same value as their in-gamut neighbors. If the checkerboard pattern is still visible after conversion, this indicates a faulty conversion. Image manipulation, such as adjusting contrast or brightness, can also cause the pattern to be visible.
The Zone Plate pattern is based on BBC R&D Report 1978/23, and can be used to test spatial frequency response of a system. This pattern generator is controlled by the xoffset and yoffset parameters and also by all the parameters starting with 'k'. The default parameters produce a grey pattern. Try 'videotestsrc pattern=zone-plate kx2=20 ky2=20 kt=1' to produce something interesting.
A standard SMPTE test pattern | |
Random noise | |
A black image | |
A white image | |
A red image | |
A green image | |
A blue image | |
Checkers pattern (1px) | |
Checkers pattern (2px) | |
Checkers pattern (4px) | |
Checkers pattern (8px) | |
Circular pattern | |
Alternate between black and white | |
SMPTE test pattern (75% color bars) | |
Zone plate | |
Gamut checking pattern | |
Chroma zone plate | |
Moving ball | |
SMPTE test pattern (100% color bars) | |
Bar with foreground color |
"pattern"
property"pattern" GstVideoTestSrcPattern : Read / Write
Type of test pattern to generate.
Default value: SMPTE 100% color bars
"timestamp-offset"
property"timestamp-offset" gint64 : Read / Write
An offset added to timestamps set on buffers (in ns).
Default value: 0
"is-live"
property"is-live" gboolean : Read / Write
Whether to act as a live source.
Default value: FALSE
"peer-alloc"
property"peer-alloc" gboolean : Read / Write
Ask the peer to allocate an output buffer.
Default value: TRUE
"colorspec"
property"colorspec" GstVideoTestSrcColorSpec : Read / Write
Generate video in the given color specification.
Default value: ITU-R Rec. BT.601
"k0"
property"k0" gint : Read / Write
Zoneplate zero order phase, for generating plain fields or phase offsets.
Default value: 0
"kt"
property"kt" gint : Read / Write
Zoneplate 1st order t phase, for generating phase rotation as a function of time.
Default value: 0
"kt2"
property"kt2" gint : Read / Write
Zoneplate 2nd order t phase, t*t/256 cycles per picture.
Default value: 0
"kx"
property"kx" gint : Read / Write
Zoneplate 1st order x phase, for generating constant horizontal frequencies.
Default value: 0
"kx2"
property"kx2" gint : Read / Write
Zoneplate 2nd order x phase, normalised to kx2/256 cycles per horizontal pixel at width/2 from origin.
Default value: 0
"kxt"
property"kxt" gint : Read / Write
Zoneplate x*t product phase, normalised to kxy/256 cycles per vertical pixel at width/2 from origin.
Default value: 0
"ky"
property"ky" gint : Read / Write
Zoneplate 1st order y phase, for generating contant vertical frequencies.
Default value: 0
"ky2"
property"ky2" gint : Read / Write
Zoneplate 2nd order y phase, normailsed to ky2/256 cycles per vertical pixel at height/2 from origin.
Default value: 0
"xoffset"
property"xoffset" gint : Read / Write
Zoneplate 2nd order products x offset.
Default value: 0
"yoffset"
property"yoffset" gint : Read / Write
Zoneplate 2nd order products y offset.
Default value: 0