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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>GstColorBalance: GStreamer Base Plugins 1.0 Library 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 Library Reference Manual">
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<link rel="up" href="gstreamer-video.html" title="Video Library">
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<link rel="prev" href="GstVideoSink.html" title="GstVideoSink">
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<link rel="next" href="GstColorBalanceChannel.html" title="GstColorBalanceChannel">
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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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Signals
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GstColorBalance
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GstColorBalance — Interface for adjusting color balance settings
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Functions
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const GList *
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gst_color_balance_list_channels ()
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gint
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gst_color_balance_get_value ()
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void
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gst_color_balance_set_value ()
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void
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gst_color_balance_value_changed ()
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GstColorBalanceType
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gst_color_balance_get_balance_type ()
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Signals
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void
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value-changed
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Run Last
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Types and Values
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GstColorBalance
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struct
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GstColorBalanceInterface
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enum
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GstColorBalanceType
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Object Hierarchy
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GInterface
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╰── GstColorBalance
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Includes
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#include <gst/video/colorbalance.h>
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Description
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This interface is implemented by elements which can perform some color
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balance operation on video frames they process. For example, modifying
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the brightness, contrast, hue or saturation.
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Example elements are 'xvimagesink' and 'colorbalance'
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Functions
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gst_color_balance_list_channels ()
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const GList *
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gst_color_balance_list_channels (GstColorBalance *balance);
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Retrieve a list of the available channels.
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Parameters
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balance
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A GstColorBalance instance
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Returns
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A
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GList containing pointers to GstColorBalanceChannel
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objects. The list is owned by the GstColorBalance
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instance and must not be freed.
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[element-type GstColorBalanceChannel][transfer none]
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gst_color_balance_get_value ()
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gint
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gst_color_balance_get_value (GstColorBalance *balance,
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GstColorBalanceChannel *channel);
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Retrieve the current value of the indicated channel, between min_value
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and max_value.
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See Also: The GstColorBalanceChannel.min_value and
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GstColorBalanceChannel.max_value members of the
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GstColorBalanceChannel object.
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Parameters
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balance
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A GstColorBalance instance
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channel
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A GstColorBalanceChannel instance
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Returns
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The current value of the channel.
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gst_color_balance_set_value ()
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void
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gst_color_balance_set_value (GstColorBalance *balance,
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GstColorBalanceChannel *channel,
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gint value);
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Sets the current value of the channel to the passed value, which must
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be between min_value and max_value.
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See Also: The GstColorBalanceChannel.min_value and
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GstColorBalanceChannel.max_value members of the
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GstColorBalanceChannel object.
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Parameters
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balance
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A GstColorBalance instance
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channel
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A GstColorBalanceChannel instance
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value
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The new value for the channel.
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gst_color_balance_value_changed ()
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void
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gst_color_balance_value_changed (GstColorBalance *balance,
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GstColorBalanceChannel *channel,
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gint value);
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A helper function called by implementations of the GstColorBalance
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interface. It fires the “value-changed” signal on the
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instance, and the “value-changed” signal on the
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channel object.
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Parameters
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balance
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A GstColorBalance instance
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channel
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A GstColorBalanceChannel whose value has changed
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value
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The new value of the channel
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gst_color_balance_get_balance_type ()
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GstColorBalanceType
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gst_color_balance_get_balance_type (GstColorBalance *balance);
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Get the GstColorBalanceType of this implementation.
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Parameters
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balance
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The GstColorBalance implementation
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Returns
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A the GstColorBalanceType.
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Types and Values
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GstColorBalance
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typedef struct _GstColorBalance GstColorBalance;
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struct GstColorBalanceInterface
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struct GstColorBalanceInterface {
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GTypeInterface iface;
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/* virtual functions */
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const GList * (* list_channels) (GstColorBalance *balance);
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void (* set_value) (GstColorBalance *balance,
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GstColorBalanceChannel *channel,
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gint value);
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gint (* get_value) (GstColorBalance *balance,
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GstColorBalanceChannel *channel);
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GstColorBalanceType (*get_balance_type) (GstColorBalance *balance);
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/* signals */
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void (* value_changed) (GstColorBalance *balance,
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GstColorBalanceChannel *channel,
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gint value);
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};
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Color-balance interface.
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Members
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GTypeInterface iface;
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the parent interface
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list_channels ()
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list handled channels
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set_value ()
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set a channel value
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get_value ()
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get a channel value
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get_balance_type ()
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implementation type
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value_changed ()
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default handler for value changed notification
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enum GstColorBalanceType
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An enumeration indicating whether an element implements color balancing
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operations in software or in dedicated hardware. In general, dedicated
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hardware implementations (such as those provided by xvimagesink) are
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preferred.
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Members
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GST_COLOR_BALANCE_HARDWARE
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Color balance is implemented with dedicated
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hardware.
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GST_COLOR_BALANCE_SOFTWARE
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Color balance is implemented via software
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processing.
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Signal Details
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The “value-changed” signal
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void
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user_function (GstColorBalance *colorbalance,
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GstColorBalanceChannel *channel,
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gint value,
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gpointer user_data)
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Fired when the value of the indicated channel has changed.
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Parameters
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colorbalance
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The GstColorBalance instance
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channel
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The GstColorBalanceChannel
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value
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The new value
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user_data
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user data set when the signal handler was connected.
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Flags: Run Last
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