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GStreamer 0.10 Core Reference Manual | ![]() |
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GstUtilsGstUtils — Various utility functions |
#include <gst/gst.h> #define GST_BOILERPLATE_WITH_INTERFACE (type, type_as_function, \ parent_type, parent_type_as_macro, interface_type, \ interface_type_as_macro, interface_as_function) #define GST_BOILERPLATE_FULL (type, type_as_function, parent_type, parent_type_macro, additional_initializations) #define GST_BOILERPLATE (type,type_as_function,parent_type,parent_type_macro) #define GST_CALL_PARENT (parent_class_cast, name, args) #define GST_CALL_PARENT_WITH_DEFAULT (parent_class_cast, name, args, def_return) #define GST_READ_UINT8 (data) #define GST_READ_UINT16_LE (data) #define GST_READ_UINT16_BE (data) #define GST_READ_UINT32_LE (data) #define GST_READ_UINT32_BE (data) #define GST_READ_UINT64_LE (data) #define GST_READ_UINT64_BE (data) #define GST_WRITE_UINT8 (data, num) #define GST_WRITE_UINT16_LE (data, num) #define GST_WRITE_UINT16_BE (data, num) #define GST_WRITE_UINT32_LE (data, num) #define GST_WRITE_UINT32_BE (data, num) #define GST_WRITE_UINT64_LE (data, num) #define GST_WRITE_UINT64_BE (data, num) #define GST_ROUND_UP_2 (num) #define GST_ROUND_UP_4 (num) #define GST_ROUND_UP_8 (num) #define GST_ROUND_UP_16 (num) #define GST_ROUND_UP_32 (num) #define GST_ROUND_UP_64 (num) void gst_atomic_int_set (gint *atomic_int, gint value); const gchar* gst_flow_get_name (GstFlowReturn ret); GQuark gst_flow_to_quark (GstFlowReturn ret); void gst_print_element_args (GString *buf, gint indent, GstElement *element); void gst_print_pad_caps (GString *buf, gint indent, GstPad *pad); #define gst_guint64_to_gdouble (value) #define gst_gdouble_to_guint64 (value) void gst_util_dump_mem (const guchar *mem, guint size); guint64 gst_util_uint64_scale (guint64 val, guint64 num, guint64 denom); guint64 gst_util_uint64_scale_int (guint64 val, gint num, gint denom); void gst_util_set_object_arg (GObject *object, const gchar *name, const gchar *value); void gst_util_set_value_from_string (GValue *value, const gchar *value_str);
#define GST_BOILERPLATE_WITH_INTERFACE(type, type_as_function, \ parent_type, parent_type_as_macro, interface_type, \ interface_type_as_macro, interface_as_function)
Like GST_BOILERPLATE, but makes the type 1) implement an interface, and 2) implement GstImplementsInterface for that type.
After this you will need to implement interface_as_function ## _supported and interface_as_function ## _interface_init
type : |
the name of the type struct |
type_as_function : |
the prefix for the functions |
parent_type_as_macro : |
the parent type macro |
interface_type : |
the name of the interface type struct |
interface_as_function : |
the interface function name prefix |
#define GST_BOILERPLATE_FULL(type, type_as_function, parent_type, parent_type_macro, additional_initializations)
Define the boilerplate type stuff to reduce typos and code size. Defines the get_type method and the parent_class static variable.
GST_BOILERPLATE_FULL (GstFdSink, gst_fdsink, GstElement, GST_TYPE_ELEMENT, _do_init);
type : |
the name of the type struct |
type_as_function : |
the prefix for the functions |
parent_type : |
the parent type struct name |
parent_type_macro : |
the parent type macro |
additional_initializations : |
function pointer in the form of void additional_initializations (GType type) that can be used for initializing interfaces and the like |
#define GST_BOILERPLATE(type,type_as_function,parent_type,parent_type_macro)
Define the boilerplate type stuff to reduce typos and code size. Defines the get_type method and the parent_class static variable.
GST_BOILERPLATE (GstFdSink, gst_fdsink, GstElement, GST_TYPE_ELEMENT);
type : |
the name of the type struct |
type_as_function : |
the prefix for the functions |
parent_type : |
the parent type struct name |
parent_type_macro : |
the parent type macro |
#define GST_CALL_PARENT(parent_class_cast, name, args)
Just call the parent handler. This assumes that there is a variable named parent_class that points to the (duh!) parent class. Note that this macro is not to be used with things that return something, use the _WITH_DEFAULT version for that
parent_class_cast : |
the name of the class cast macro for the parent type |
name : |
name of the function to call |
args : |
arguments enclosed in '( )' |
#define GST_CALL_PARENT_WITH_DEFAULT(parent_class_cast, name, args, def_return)
Same as GST_CALL_PARENT()
, but in case there is no implementation, it
evaluates to def_return
.
parent_class_cast : |
the name of the class cast macro for the parent type |
name : |
name of the function to call |
args : |
arguments enclosed in '( )' |
def_return : |
default result |
#define GST_READ_UINT8(data)
Read an 8 bit unsigned integer value from the memory buffer.
data : |
memory location |
#define GST_READ_UINT16_LE(data)
Read a 16 bit unsigned integer value in little endian format from the memory buffer.
data : |
memory location |
#define GST_READ_UINT16_BE(data)
Read a 16 bit unsigned integer value in big endian format from the memory buffer.
data : |
memory location |
#define GST_READ_UINT32_LE(data)
Read a 32 bit unsigned integer value in little endian format from the memory buffer.
data : |
memory location |
#define GST_READ_UINT32_BE(data)
Read a 32 bit unsigned integer value in big endian format from the memory buffer.
data : |
memory location |
#define GST_READ_UINT64_LE(data)
Read a 64 bit unsigned integer value in little endian format from the memory buffer.
data : |
memory location |
#define GST_READ_UINT64_BE(data)
Read a 64 bit unsigned integer value in big endian format from the memory buffer.
data : |
memory location |
#define GST_WRITE_UINT8(data, num)
Store an 8 bit unsigned integer value into the memory buffer.
data : |
memory location |
num : |
value to store |
#define GST_WRITE_UINT16_LE(data, num)
Store a 16 bit unsigned integer value in little endian format into the memory buffer.
data : |
memory location |
num : |
value to store |
#define GST_WRITE_UINT16_BE(data, num)
Store a 16 bit unsigned integer value in big endian format into the memory buffer.
data : |
memory location |
num : |
value to store |
#define GST_WRITE_UINT32_LE(data, num)
Store a 32 bit unsigned integer value in little endian format into the memory buffer.
data : |
memory location |
num : |
value to store |
#define GST_WRITE_UINT32_BE(data, num)
Store a 32 bit unsigned integer value in big endian format into the memory buffer.
data : |
memory location |
num : |
value to store |
#define GST_WRITE_UINT64_LE(data, num)
Store a 64 bit unsigned integer value in little endian format into the memory buffer.
data : |
memory location |
num : |
value to store |
#define GST_WRITE_UINT64_BE(data, num)
Store a 64 bit unsigned integer value in big endian format into the memory buffer.
data : |
memory location |
num : |
value to store |
#define GST_ROUND_UP_2(num) (((num)+1)&~1)
Make number divideable by two without a rest.
num : |
value round up |
#define GST_ROUND_UP_4(num) (((num)+3)&~3)
Make number divideable by four without a rest.
num : |
value round up |
#define GST_ROUND_UP_8(num) (((num)+7)&~7)
Make number divideable by eight without a rest.
num : |
value round up |
#define GST_ROUND_UP_16(num) (((num)+15)&~15)
Make number divideable by 16 without a rest.
num : |
value round up |
#define GST_ROUND_UP_32(num) (((num)+31)&~31)
Make number divideable by 32 without a rest.
num : |
value round up |
#define GST_ROUND_UP_64(num) (((num)+63)&~63)
Make number divideable by 64 without a rest.
num : |
value round up |
void gst_atomic_int_set (gint *atomic_int, gint value);
Unconditionally sets the atomic integer to value
.
atomic_int : |
pointer to an atomic integer |
value : |
value to set |
const gchar* gst_flow_get_name (GstFlowReturn ret);
Gets a string representing the given flow return.
ret : |
a GstFlowReturn to get the name of. |
Returns : | a string with the name of the flow return. |
GQuark gst_flow_to_quark (GstFlowReturn ret);
Get the unique quark for the given GstFlowReturn.
ret : |
a GstFlowReturn to get the quark of. |
Returns : | the quark associated with the flow return or 0 if an invalid return was specified. |
void gst_print_element_args (GString *buf, gint indent, GstElement *element);
Print the element argument in a human readable format in the given GString.
buf : |
the buffer to print the args in |
indent : |
initial indentation |
element : |
the element to print the args of |
void gst_print_pad_caps (GString *buf, gint indent, GstPad *pad);
Write the pad capabilities in a human readable format into the given GString.
buf : |
the buffer to print the caps in |
indent : |
initial indentation |
pad : |
the pad to print the caps from |
#define gst_guint64_to_gdouble(value)
Convert value
to a gdouble.
value : |
the guint64 value to convert |
Returns : | value converted to a gdouble.
|
#define gst_gdouble_to_guint64(value)
Convert value
to a guint64.
value : |
the gdouble value to convert |
Returns : | value converted to a guint64.
|
void gst_util_dump_mem (const guchar *mem, guint size);
Dumps the memory block into a hex representation. Useful for debugging.
mem : |
a pointer to the memory to dump |
size : |
the size of the memory block to dump |
guint64 gst_util_uint64_scale (guint64 val, guint64 num, guint64 denom);
Scale val
by num
/ denom
, trying to avoid overflows.
This function can potentially be very slow if denom > G_MAXUINT32.
val : |
the number to scale |
num : |
the numerator of the scale ratio |
denom : |
the denominator of the scale ratio |
Returns : | val * num / denom , trying to avoid overflows.
|
guint64 gst_util_uint64_scale_int (guint64 val, gint num, gint denom);
Scale a guint64 by a factor expressed as a fraction (num/denom), avoiding overflows and loss of precision.
num
and denom
must be positive integers. denom
cannot be 0.
val : |
guint64 (such as a GstClockTime) to scale. |
num : |
numerator of the scale factor. |
denom : |
denominator of the scale factor. |
Returns : | val * num / denom , avoiding overflow and loss of precision
|
void gst_util_set_object_arg (GObject *object, const gchar *name, const gchar *value);
Convertes the string value to the type of the objects argument and sets the argument with it.
object : |
the object to set the argument of |
name : |
the name of the argument to set |
value : |
the string value to set |
<< GstUriHandler | GStreamer GValue types >> |