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gstreamer/gst/gstutils.h
Sebastian Dröge a7d282d272 utils: Export linear regression calculation as public function 
It is useful outside the GstClock code too.

https://bugzilla.gnome.org/show_bug.cgi?id=774916
2016-11-28 14:26:50 +02:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
* 2002 Thomas Vander Stichele <thomas@apestaart.org>
*
* gstutils.h: Header for various utility functions
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_UTILS_H__
#define __GST_UTILS_H__
#include <glib.h>
#include <gst/gstconfig.h>
#include <gst/gstbin.h>
#include <gst/gstparse.h>
G_BEGIN_DECLS
void gst_util_set_value_from_string (GValue *value, const gchar *value_str);
void gst_util_set_object_arg (GObject *object, const gchar *name, const gchar *value);
void gst_util_dump_mem (const guchar *mem, guint size);
guint64 gst_util_gdouble_to_guint64 (gdouble value) G_GNUC_CONST;
gdouble gst_util_guint64_to_gdouble (guint64 value) G_GNUC_CONST;
/**
* gst_guint64_to_gdouble:
* @value: the #guint64 value to convert
*
* Convert @value to a gdouble.
*
* Returns: @value converted to a #gdouble.
*/
/**
* gst_gdouble_to_guint64:
* @value: the #gdouble value to convert
*
* Convert @value to a guint64.
*
* Returns: @value converted to a #guint64.
*/
#ifdef WIN32
#define gst_gdouble_to_guint64(value) gst_util_gdouble_to_guint64(value)
#define gst_guint64_to_gdouble(value) gst_util_guint64_to_gdouble(value)
#else
#define gst_gdouble_to_guint64(value) ((guint64) (value))
#define gst_guint64_to_gdouble(value) ((gdouble) (value))
#endif
guint64 gst_util_uint64_scale (guint64 val, guint64 num, guint64 denom);
guint64 gst_util_uint64_scale_round (guint64 val, guint64 num, guint64 denom);
guint64 gst_util_uint64_scale_ceil (guint64 val, guint64 num, guint64 denom);
guint64 gst_util_uint64_scale_int (guint64 val, gint num, gint denom);
guint64 gst_util_uint64_scale_int_round (guint64 val, gint num, gint denom);
guint64 gst_util_uint64_scale_int_ceil (guint64 val, gint num, gint denom);
guint32 gst_util_seqnum_next (void);
gint32 gst_util_seqnum_compare (guint32 s1, guint32 s2);
guint gst_util_group_id_next (void);
/**
* GST_CALL_PARENT:
* @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 '( )'
*
* 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
*/
#define GST_CALL_PARENT(parent_class_cast, name, args) \
((parent_class_cast(parent_class)->name != NULL) ? \
parent_class_cast(parent_class)->name args : (void) 0)
/**
* GST_CALL_PARENT_WITH_DEFAULT:
* @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
*
* Same as GST_CALL_PARENT(), but in case there is no implementation, it
* evaluates to @def_return.
*/
#define GST_CALL_PARENT_WITH_DEFAULT(parent_class_cast, name, args, def_return)\
((parent_class_cast(parent_class)->name != NULL) ? \
parent_class_cast(parent_class)->name args : def_return)
/* Define PUT and GET functions for unaligned memory */
#define _GST_GET(__data, __idx, __size, __shift) \
(((guint##__size) (((const guint8 *) (__data))[__idx])) << (__shift))
#define _GST_PUT(__data, __idx, __size, __shift, __num) \
(((guint8 *) (__data))[__idx] = (((guint##__size) (__num)) >> (__shift)) & 0xff)
#ifndef __GTK_DOC_IGNORE__
#if GST_HAVE_UNALIGNED_ACCESS
static inline guint16 __gst_fast_read16(const guint8 *v) {
return *(const guint16*)(const void*)(v);
}
static inline guint32 __gst_fast_read32(const guint8 *v) {
return *(const guint32*)(const void*)(v);
}
static inline guint64 __gst_fast_read64(const guint8 *v) {
return *(const guint64*)(const void*)(v);
}
static inline guint16 __gst_fast_read_swap16(const guint8 *v) {
return GUINT16_SWAP_LE_BE(*(const guint16*)(const void*)(v));
}
static inline guint32 __gst_fast_read_swap32(const guint8 *v) {
return GUINT32_SWAP_LE_BE(*(const guint32*)(const void*)(v));
}
static inline guint64 __gst_fast_read_swap64(const guint8 *v) {
return GUINT64_SWAP_LE_BE(*(const guint64*)(const void*)(v));
}
# define _GST_FAST_READ(s, d) __gst_fast_read##s((const guint8 *)(d))
# define _GST_FAST_READ_SWAP(s, d) __gst_fast_read_swap##s((const guint8 *)(d))
static inline void __gst_fast_write16 (guint8 *p, guint16 v) {
*(guint16*)(void*)(p) = v;
}
static inline void __gst_fast_write32 (guint8 *p, guint32 v) {
*(guint32*)(void*)(p) = v;
}
static inline void __gst_fast_write64 (guint8 *p, guint64 v) {
*(guint64*)(void*)(p) = v;
}
static inline void __gst_fast_write_swap16 (guint8 *p, guint16 v) {
*(guint16*)(void*)(p) = GUINT16_SWAP_LE_BE (v);
}
static inline void __gst_fast_write_swap32 (guint8 *p, guint32 v) {
*(guint32*)(void*)(p) = GUINT32_SWAP_LE_BE (v);
}
static inline void __gst_fast_write_swap64 (guint8 *p, guint64 v) {
*(guint64*)(void*)(p) = GUINT64_SWAP_LE_BE (v);
}
# define _GST_FAST_WRITE(s, d, v) __gst_fast_write##s((guint8 *)(d), (v))
# define _GST_FAST_WRITE_SWAP(s, d, v) __gst_fast_write_swap##s((guint8 *)(d), (v))
#endif
#endif
/**
* GST_READ_UINT64_BE:
* @data: memory location
*
* Read a 64 bit unsigned integer value in big endian format from the memory buffer.
*/
/**
* GST_READ_UINT64_LE:
* @data: memory location
*
* Read a 64 bit unsigned integer value in little endian format from the memory buffer.
*/
#if GST_HAVE_UNALIGNED_ACCESS
# if (G_BYTE_ORDER == G_BIG_ENDIAN)
# define GST_READ_UINT64_BE(data) _GST_FAST_READ (64, data)
# define GST_READ_UINT64_LE(data) _GST_FAST_READ_SWAP (64, data)
# else
# define GST_READ_UINT64_BE(data) _GST_FAST_READ_SWAP (64, data)
# define GST_READ_UINT64_LE(data) _GST_FAST_READ (64, data)
# endif
#else
#define _GST_READ_UINT64_BE(data) (_GST_GET (data, 0, 64, 56) | \
_GST_GET (data, 1, 64, 48) | \
_GST_GET (data, 2, 64, 40) | \
_GST_GET (data, 3, 64, 32) | \
_GST_GET (data, 4, 64, 24) | \
_GST_GET (data, 5, 64, 16) | \
_GST_GET (data, 6, 64, 8) | \
_GST_GET (data, 7, 64, 0))
#define _GST_READ_UINT64_LE(data) (_GST_GET (data, 7, 64, 56) | \
_GST_GET (data, 6, 64, 48) | \
_GST_GET (data, 5, 64, 40) | \
_GST_GET (data, 4, 64, 32) | \
_GST_GET (data, 3, 64, 24) | \
_GST_GET (data, 2, 64, 16) | \
_GST_GET (data, 1, 64, 8) | \
_GST_GET (data, 0, 64, 0))
#define GST_READ_UINT64_BE(data) __gst_slow_read64_be((const guint8 *)(data))
static inline guint64 __gst_slow_read64_be (const guint8 * data) {
return _GST_READ_UINT64_BE (data);
}
#define GST_READ_UINT64_LE(data) __gst_slow_read64_le((const guint8 *)(data))
static inline guint64 __gst_slow_read64_le (const guint8 * data) {
return _GST_READ_UINT64_LE (data);
}
#endif
/**
* GST_READ_UINT32_BE:
* @data: memory location
*
* Read a 32 bit unsigned integer value in big endian format from the memory buffer.
*/
/**
* GST_READ_UINT32_LE:
* @data: memory location
*
* Read a 32 bit unsigned integer value in little endian format from the memory buffer.
*/
#if GST_HAVE_UNALIGNED_ACCESS
# if (G_BYTE_ORDER == G_BIG_ENDIAN)
# define GST_READ_UINT32_BE(data) _GST_FAST_READ (32, data)
# define GST_READ_UINT32_LE(data) _GST_FAST_READ_SWAP (32, data)
# else
# define GST_READ_UINT32_BE(data) _GST_FAST_READ_SWAP (32, data)
# define GST_READ_UINT32_LE(data) _GST_FAST_READ (32, data)
# endif
#else
#define _GST_READ_UINT32_BE(data) (_GST_GET (data, 0, 32, 24) | \
_GST_GET (data, 1, 32, 16) | \
_GST_GET (data, 2, 32, 8) | \
_GST_GET (data, 3, 32, 0))
#define _GST_READ_UINT32_LE(data) (_GST_GET (data, 3, 32, 24) | \
_GST_GET (data, 2, 32, 16) | \
_GST_GET (data, 1, 32, 8) | \
_GST_GET (data, 0, 32, 0))
#define GST_READ_UINT32_BE(data) __gst_slow_read32_be((const guint8 *)(data))
static inline guint32 __gst_slow_read32_be (const guint8 * data) {
return _GST_READ_UINT32_BE (data);
}
#define GST_READ_UINT32_LE(data) __gst_slow_read32_le((const guint8 *)(data))
static inline guint32 __gst_slow_read32_le (const guint8 * data) {
return _GST_READ_UINT32_LE (data);
}
#endif
/**
* GST_READ_UINT24_BE:
* @data: memory location
*
* Read a 24 bit unsigned integer value in big endian format from the memory buffer.
*/
#define _GST_READ_UINT24_BE(data) (_GST_GET (data, 0, 32, 16) | \
_GST_GET (data, 1, 32, 8) | \
_GST_GET (data, 2, 32, 0))
#define GST_READ_UINT24_BE(data) __gst_slow_read24_be((const guint8 *)(data))
static inline guint32 __gst_slow_read24_be (const guint8 * data) {
return _GST_READ_UINT24_BE (data);
}
/**
* GST_READ_UINT24_LE:
* @data: memory location
*
* Read a 24 bit unsigned integer value in little endian format from the memory buffer.
*/
#define _GST_READ_UINT24_LE(data) (_GST_GET (data, 2, 32, 16) | \
_GST_GET (data, 1, 32, 8) | \
_GST_GET (data, 0, 32, 0))
#define GST_READ_UINT24_LE(data) __gst_slow_read24_le((const guint8 *)(data))
static inline guint32 __gst_slow_read24_le (const guint8 * data) {
return _GST_READ_UINT24_LE (data);
}
/**
* GST_READ_UINT16_BE:
* @data: memory location
*
* Read a 16 bit unsigned integer value in big endian format from the memory buffer.
*/
/**
* GST_READ_UINT16_LE:
* @data: memory location
*
* Read a 16 bit unsigned integer value in little endian format from the memory buffer.
*/
#if GST_HAVE_UNALIGNED_ACCESS
# if (G_BYTE_ORDER == G_BIG_ENDIAN)
# define GST_READ_UINT16_BE(data) _GST_FAST_READ (16, data)
# define GST_READ_UINT16_LE(data) _GST_FAST_READ_SWAP (16, data)
# else
# define GST_READ_UINT16_BE(data) _GST_FAST_READ_SWAP (16, data)
# define GST_READ_UINT16_LE(data) _GST_FAST_READ (16, data)
# endif
#else
#define _GST_READ_UINT16_BE(data) (_GST_GET (data, 0, 16, 8) | \
_GST_GET (data, 1, 16, 0))
#define _GST_READ_UINT16_LE(data) (_GST_GET (data, 1, 16, 8) | \
_GST_GET (data, 0, 16, 0))
#define GST_READ_UINT16_BE(data) __gst_slow_read16_be((const guint8 *)(data))
static inline guint16 __gst_slow_read16_be (const guint8 * data) {
return _GST_READ_UINT16_BE (data);
}
#define GST_READ_UINT16_LE(data) __gst_slow_read16_le((const guint8 *)(data))
static inline guint16 __gst_slow_read16_le (const guint8 * data) {
return _GST_READ_UINT16_LE (data);
}
#endif
/**
* GST_READ_UINT8:
* @data: memory location
*
* Read an 8 bit unsigned integer value from the memory buffer.
*/
#define GST_READ_UINT8(data) (_GST_GET (data, 0, 8, 0))
/**
* GST_WRITE_UINT64_BE:
* @data: memory location
* @val: value to store
*
* Store a 64 bit unsigned integer value in big endian format into the memory buffer.
*/
/**
* GST_WRITE_UINT64_LE:
* @data: memory location
* @val: value to store
*
* Store a 64 bit unsigned integer value in little endian format into the memory buffer.
*/
#if GST_HAVE_UNALIGNED_ACCESS
# if (G_BYTE_ORDER == G_BIG_ENDIAN)
# define GST_WRITE_UINT64_BE(data,val) _GST_FAST_WRITE(64,data,val)
# define GST_WRITE_UINT64_LE(data,val) _GST_FAST_WRITE_SWAP(64,data,val)
# else
# define GST_WRITE_UINT64_BE(data,val) _GST_FAST_WRITE_SWAP(64,data,val)
# define GST_WRITE_UINT64_LE(data,val) _GST_FAST_WRITE(64,data,val)
# endif
#else
#define GST_WRITE_UINT64_BE(data,val) do { \
gpointer __put_data = data; \
guint64 __put_val = val; \
_GST_PUT (__put_data, 0, 64, 56, __put_val); \
_GST_PUT (__put_data, 1, 64, 48, __put_val); \
_GST_PUT (__put_data, 2, 64, 40, __put_val); \
_GST_PUT (__put_data, 3, 64, 32, __put_val); \
_GST_PUT (__put_data, 4, 64, 24, __put_val); \
_GST_PUT (__put_data, 5, 64, 16, __put_val); \
_GST_PUT (__put_data, 6, 64, 8, __put_val); \
_GST_PUT (__put_data, 7, 64, 0, __put_val); \
} while (0)
#define GST_WRITE_UINT64_LE(data,val) do { \
gpointer __put_data = data; \
guint64 __put_val = val; \
_GST_PUT (__put_data, 0, 64, 0, __put_val); \
_GST_PUT (__put_data, 1, 64, 8, __put_val); \
_GST_PUT (__put_data, 2, 64, 16, __put_val); \
_GST_PUT (__put_data, 3, 64, 24, __put_val); \
_GST_PUT (__put_data, 4, 64, 32, __put_val); \
_GST_PUT (__put_data, 5, 64, 40, __put_val); \
_GST_PUT (__put_data, 6, 64, 48, __put_val); \
_GST_PUT (__put_data, 7, 64, 56, __put_val); \
} while (0)
#endif /* !GST_HAVE_UNALIGNED_ACCESS */
/**
* GST_WRITE_UINT32_BE:
* @data: memory location
* @val: value to store
*
* Store a 32 bit unsigned integer value in big endian format into the memory buffer.
*/
/**
* GST_WRITE_UINT32_LE:
* @data: memory location
* @val: value to store
*
* Store a 32 bit unsigned integer value in little endian format into the memory buffer.
*/
#if GST_HAVE_UNALIGNED_ACCESS
# if (G_BYTE_ORDER == G_BIG_ENDIAN)
# define GST_WRITE_UINT32_BE(data,val) _GST_FAST_WRITE(32,data,val)
# define GST_WRITE_UINT32_LE(data,val) _GST_FAST_WRITE_SWAP(32,data,val)
# else
# define GST_WRITE_UINT32_BE(data,val) _GST_FAST_WRITE_SWAP(32,data,val)
# define GST_WRITE_UINT32_LE(data,val) _GST_FAST_WRITE(32,data,val)
# endif
#else
#define GST_WRITE_UINT32_BE(data,val) do { \
gpointer __put_data = data; \
guint32 __put_val = val; \
_GST_PUT (__put_data, 0, 32, 24, __put_val); \
_GST_PUT (__put_data, 1, 32, 16, __put_val); \
_GST_PUT (__put_data, 2, 32, 8, __put_val); \
_GST_PUT (__put_data, 3, 32, 0, __put_val); \
} while (0)
#define GST_WRITE_UINT32_LE(data,val) do { \
gpointer __put_data = data; \
guint32 __put_val = val; \
_GST_PUT (__put_data, 0, 32, 0, __put_val); \
_GST_PUT (__put_data, 1, 32, 8, __put_val); \
_GST_PUT (__put_data, 2, 32, 16, __put_val); \
_GST_PUT (__put_data, 3, 32, 24, __put_val); \
} while (0)
#endif /* !GST_HAVE_UNALIGNED_ACCESS */
/**
* GST_WRITE_UINT24_BE:
* @data: memory location
* @num: value to store
*
* Store a 24 bit unsigned integer value in big endian format into the memory buffer.
*/
#define GST_WRITE_UINT24_BE(data, num) do { \
gpointer __put_data = data; \
guint32 __put_val = num; \
_GST_PUT (__put_data, 0, 32, 16, __put_val); \
_GST_PUT (__put_data, 1, 32, 8, __put_val); \
_GST_PUT (__put_data, 2, 32, 0, __put_val); \
} while (0)
/**
* GST_WRITE_UINT24_LE:
* @data: memory location
* @num: value to store
*
* Store a 24 bit unsigned integer value in little endian format into the memory buffer.
*/
#define GST_WRITE_UINT24_LE(data, num) do { \
gpointer __put_data = data; \
guint32 __put_val = num; \
_GST_PUT (__put_data, 0, 32, 0, __put_val); \
_GST_PUT (__put_data, 1, 32, 8, __put_val); \
_GST_PUT (__put_data, 2, 32, 16, __put_val); \
} while (0)
/**
* GST_WRITE_UINT16_BE:
* @data: memory location
* @val: value to store
*
* Store a 16 bit unsigned integer value in big endian format into the memory buffer.
*/
/**
* GST_WRITE_UINT16_LE:
* @data: memory location
* @val: value to store
*
* Store a 16 bit unsigned integer value in little endian format into the memory buffer.
*/
#if GST_HAVE_UNALIGNED_ACCESS
# if (G_BYTE_ORDER == G_BIG_ENDIAN)
# define GST_WRITE_UINT16_BE(data,val) _GST_FAST_WRITE(16,data,val)
# define GST_WRITE_UINT16_LE(data,val) _GST_FAST_WRITE_SWAP(16,data,val)
# else
# define GST_WRITE_UINT16_BE(data,val) _GST_FAST_WRITE_SWAP(16,data,val)
# define GST_WRITE_UINT16_LE(data,val) _GST_FAST_WRITE(16,data,val)
# endif
#else
#define GST_WRITE_UINT16_BE(data,val) do { \
gpointer __put_data = data; \
guint16 __put_val = val; \
_GST_PUT (__put_data, 0, 16, 8, __put_val); \
_GST_PUT (__put_data, 1, 16, 0, __put_val); \
} while (0)
#define GST_WRITE_UINT16_LE(data,val) do { \
gpointer __put_data = data; \
guint16 __put_val = val; \
_GST_PUT (__put_data, 0, 16, 0, __put_val); \
_GST_PUT (__put_data, 1, 16, 8, __put_val); \
} while (0)
#endif /* !GST_HAVE_UNALIGNED_ACCESS */
/**
* GST_WRITE_UINT8:
* @data: memory location
* @num: value to store
*
* Store an 8 bit unsigned integer value into the memory buffer.
*/
#define GST_WRITE_UINT8(data, num) do { \
_GST_PUT (data, 0, 8, 0, num); \
} while (0)
/* Float endianness conversion macros */
/* FIXME: Remove this once we depend on a GLib version with this */
#ifndef GFLOAT_FROM_LE
/**
* GFLOAT_SWAP_LE_BE:
* @in: input value
*
* Swap byte order of a 32-bit floating point value (float).
*
* Returns: @in byte-swapped.
*/
static inline gfloat
GFLOAT_SWAP_LE_BE(gfloat in)
{
union
{
guint32 i;
gfloat f;
} u;
u.f = in;
u.i = GUINT32_SWAP_LE_BE (u.i);
return u.f;
}
/**
* GDOUBLE_SWAP_LE_BE:
* @in: input value
*
* Swap byte order of a 64-bit floating point value (double).
*
* Returns: @in byte-swapped.
*/
static inline gdouble
GDOUBLE_SWAP_LE_BE(gdouble in)
{
union
{
guint64 i;
gdouble d;
} u;
u.d = in;
u.i = GUINT64_SWAP_LE_BE (u.i);
return u.d;
}
/**
* GDOUBLE_TO_LE:
* @val: value
*
* Convert 64-bit floating point value (double) from native byte order into
* little endian byte order.
*/
/**
* GDOUBLE_TO_BE:
* @val: value
*
* Convert 64-bit floating point value (double) from native byte order into
* big endian byte order.
*/
/**
* GDOUBLE_FROM_LE:
* @val: value
*
* Convert 64-bit floating point value (double) from little endian byte order
* into native byte order.
*/
/**
* GDOUBLE_FROM_BE:
* @val: value
*
* Convert 64-bit floating point value (double) from big endian byte order
* into native byte order.
*/
/**
* GFLOAT_TO_LE:
* @val: value
*
* Convert 32-bit floating point value (float) from native byte order into
* little endian byte order.
*/
/**
* GFLOAT_TO_BE:
* @val: value
*
* Convert 32-bit floating point value (float) from native byte order into
* big endian byte order.
*/
/**
* GFLOAT_FROM_LE:
* @val: value
*
* Convert 32-bit floating point value (float) from little endian byte order
* into native byte order.
*/
/**
* GFLOAT_FROM_BE:
* @val: value
*
* Convert 32-bit floating point value (float) from big endian byte order
* into native byte order.
*/
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define GFLOAT_TO_LE(val) ((gfloat) (val))
#define GFLOAT_TO_BE(val) (GFLOAT_SWAP_LE_BE (val))
#define GDOUBLE_TO_LE(val) ((gdouble) (val))
#define GDOUBLE_TO_BE(val) (GDOUBLE_SWAP_LE_BE (val))
#elif G_BYTE_ORDER == G_BIG_ENDIAN
#define GFLOAT_TO_LE(val) (GFLOAT_SWAP_LE_BE (val))
#define GFLOAT_TO_BE(val) ((gfloat) (val))
#define GDOUBLE_TO_LE(val) (GDOUBLE_SWAP_LE_BE (val))
#define GDOUBLE_TO_BE(val) ((gdouble) (val))
#else /* !G_LITTLE_ENDIAN && !G_BIG_ENDIAN */
#error unknown ENDIAN type
#endif /* !G_LITTLE_ENDIAN && !G_BIG_ENDIAN */
#define GFLOAT_FROM_LE(val) (GFLOAT_TO_LE (val))
#define GFLOAT_FROM_BE(val) (GFLOAT_TO_BE (val))
#define GDOUBLE_FROM_LE(val) (GDOUBLE_TO_LE (val))
#define GDOUBLE_FROM_BE(val) (GDOUBLE_TO_BE (val))
#endif /* !defined(GFLOAT_FROM_LE) */
/**
* GST_READ_FLOAT_LE:
* @data: memory location
*
* Read a 32 bit float value in little endian format from the memory buffer.
*
* Returns: The floating point value read from @data
*/
static inline gfloat
GST_READ_FLOAT_LE(const guint8 *data)
{
union
{
guint32 i;
gfloat f;
} u;
u.i = GST_READ_UINT32_LE (data);
return u.f;
}
/**
* GST_READ_FLOAT_BE:
* @data: memory location
*
* Read a 32 bit float value in big endian format from the memory buffer.
*
* Returns: The floating point value read from @data
*/
static inline gfloat
GST_READ_FLOAT_BE(const guint8 *data)
{
union
{
guint32 i;
gfloat f;
} u;
u.i = GST_READ_UINT32_BE (data);
return u.f;
}
/**
* GST_READ_DOUBLE_LE:
* @data: memory location
*
* Read a 64 bit double value in little endian format from the memory buffer.
*
* Returns: The double-precision floating point value read from @data
*/
static inline gdouble
GST_READ_DOUBLE_LE(const guint8 *data)
{
union
{
guint64 i;
gdouble d;
} u;
u.i = GST_READ_UINT64_LE (data);
return u.d;
}
/**
* GST_READ_DOUBLE_BE:
* @data: memory location
*
* Read a 64 bit double value in big endian format from the memory buffer.
*
* Returns: The double-precision floating point value read from @data
*/
static inline gdouble
GST_READ_DOUBLE_BE(const guint8 *data)
{
union
{
guint64 i;
gdouble d;
} u;
u.i = GST_READ_UINT64_BE (data);
return u.d;
}
/**
* GST_WRITE_FLOAT_LE:
* @data: memory location
* @num: value to store
*
* Store a 32 bit float value in little endian format into the memory buffer.
*/
static inline void
GST_WRITE_FLOAT_LE(guint8 *data, gfloat num)
{
union
{
guint32 i;
gfloat f;
} u;
u.f = num;
GST_WRITE_UINT32_LE (data, u.i);
}
/**
* GST_WRITE_FLOAT_BE:
* @data: memory location
* @num: value to store
*
* Store a 32 bit float value in big endian format into the memory buffer.
*/
static inline void
GST_WRITE_FLOAT_BE(guint8 *data, gfloat num)
{
union
{
guint32 i;
gfloat f;
} u;
u.f = num;
GST_WRITE_UINT32_BE (data, u.i);
}
/**
* GST_WRITE_DOUBLE_LE:
* @data: memory location
* @num: value to store
*
* Store a 64 bit double value in little endian format into the memory buffer.
*/
static inline void
GST_WRITE_DOUBLE_LE(guint8 *data, gdouble num)
{
union
{
guint64 i;
gdouble d;
} u;
u.d = num;
GST_WRITE_UINT64_LE (data, u.i);
}
/**
* GST_WRITE_DOUBLE_BE:
* @data: memory location
* @num: value to store
*
* Store a 64 bit double value in big endian format into the memory buffer.
*/
static inline void
GST_WRITE_DOUBLE_BE(guint8 *data, gdouble num)
{
union
{
guint64 i;
gdouble d;
} u;
u.d = num;
GST_WRITE_UINT64_BE (data, u.i);
}
/* Miscellaneous utility macros */
/**
* GST_ROUND_UP_2:
* @num: integer value to round up
*
* Rounds an integer value up to the next multiple of 2.
*/
#define GST_ROUND_UP_2(num) (((num)+1)&~1)
/**
* GST_ROUND_UP_4:
* @num: integer value to round up
*
* Rounds an integer value up to the next multiple of 4.
*/
#define GST_ROUND_UP_4(num) (((num)+3)&~3)
/**
* GST_ROUND_UP_8:
* @num: integer value to round up
*
* Rounds an integer value up to the next multiple of 8.
*/
#define GST_ROUND_UP_8(num) (((num)+7)&~7)
/**
* GST_ROUND_UP_16:
* @num: integer value to round up
*
* Rounds an integer value up to the next multiple of 16.
*/
#define GST_ROUND_UP_16(num) (((num)+15)&~15)
/**
* GST_ROUND_UP_32:
* @num: integer value to round up
*
* Rounds an integer value up to the next multiple of 32.
*/
#define GST_ROUND_UP_32(num) (((num)+31)&~31)
/**
* GST_ROUND_UP_64:
* @num: integer value to round up
*
* Rounds an integer value up to the next multiple of 64.
*/
#define GST_ROUND_UP_64(num) (((num)+63)&~63)
/**
* GST_ROUND_UP_128:
* @num: integer value to round up
*
* Rounds an integer value up to the next multiple of 128.
* Since: 1.4
*/
#define GST_ROUND_UP_128(num) (((num)+127)&~127)
/**
* GST_ROUND_UP_N:
* @num: integrer value to round up
* @align: a power of two to round up to
*
* Rounds an integer value up to the next multiple of @align. @align MUST be a
* power of two.
*/
#define GST_ROUND_UP_N(num,align) ((((num) + ((align) - 1)) & ~((align) - 1)))
/**
* GST_ROUND_DOWN_2:
* @num: integer value to round down
*
* Rounds an integer value down to the next multiple of 2.
*/
#define GST_ROUND_DOWN_2(num) ((num)&(~1))
/**
* GST_ROUND_DOWN_4:
* @num: integer value to round down
*
* Rounds an integer value down to the next multiple of 4.
*/
#define GST_ROUND_DOWN_4(num) ((num)&(~3))
/**
* GST_ROUND_DOWN_8:
* @num: integer value to round down
*
* Rounds an integer value down to the next multiple of 8.
*/
#define GST_ROUND_DOWN_8(num) ((num)&(~7))
/**
* GST_ROUND_DOWN_16:
* @num: integer value to round down
*
* Rounds an integer value down to the next multiple of 16.
*/
#define GST_ROUND_DOWN_16(num) ((num)&(~15))
/**
* GST_ROUND_DOWN_32:
* @num: integer value to round down
*
* Rounds an integer value down to the next multiple of 32.
*/
#define GST_ROUND_DOWN_32(num) ((num)&(~31))
/**
* GST_ROUND_DOWN_64:
* @num: integer value to round down
*
* Rounds an integer value down to the next multiple of 64.
*/
#define GST_ROUND_DOWN_64(num) ((num)&(~63))
/**
* GST_ROUND_DOWN_128:
* @num: integer value to round down
*
* Rounds an integer value down to the next multiple of 128.
* Since: 1.4
*/
#define GST_ROUND_DOWN_128(num) ((num)&(~127))
/**
* GST_ROUND_DOWN_N:
* @num: integrer value to round down
* @align: a power of two to round down to
*
* Rounds an integer value down to the next multiple of @align. @align MUST be a
* power of two.
*/
#define GST_ROUND_DOWN_N(num,align) (((num) & ~((align) - 1)))
void gst_object_default_error (GstObject * source,
const GError * error,
const gchar * debug);
/* element functions */
void gst_element_create_all_pads (GstElement *element);
GstPad* gst_element_get_compatible_pad (GstElement *element, GstPad *pad,
GstCaps *caps);
GstPadTemplate* gst_element_get_compatible_pad_template (GstElement *element, GstPadTemplate *compattempl);
const gchar* gst_element_state_get_name (GstState state);
const gchar * gst_element_state_change_return_get_name (GstStateChangeReturn state_ret);
gboolean gst_element_link (GstElement *src, GstElement *dest);
gboolean gst_element_link_many (GstElement *element_1,
GstElement *element_2, ...) G_GNUC_NULL_TERMINATED;
gboolean gst_element_link_filtered (GstElement * src,
GstElement * dest,
GstCaps *filter);
void gst_element_unlink (GstElement *src, GstElement *dest);
void gst_element_unlink_many (GstElement *element_1,
GstElement *element_2, ...) G_GNUC_NULL_TERMINATED;
gboolean gst_element_link_pads (GstElement *src, const gchar *srcpadname,
GstElement *dest, const gchar *destpadname);
gboolean gst_element_link_pads_full (GstElement *src, const gchar *srcpadname,
GstElement *dest, const gchar *destpadname,
GstPadLinkCheck flags);
void gst_element_unlink_pads (GstElement *src, const gchar *srcpadname,
GstElement *dest, const gchar *destpadname);
gboolean gst_element_link_pads_filtered (GstElement * src, const gchar * srcpadname,
GstElement * dest, const gchar * destpadname,
GstCaps *filter);
gboolean gst_element_seek_simple (GstElement *element,
GstFormat format,
GstSeekFlags seek_flags,
gint64 seek_pos);
/* util elementfactory functions */
gboolean gst_element_factory_can_sink_all_caps (GstElementFactory *factory, const GstCaps *caps);
gboolean gst_element_factory_can_src_all_caps (GstElementFactory *factory, const GstCaps *caps);
gboolean gst_element_factory_can_sink_any_caps (GstElementFactory *factory, const GstCaps *caps);
gboolean gst_element_factory_can_src_any_caps (GstElementFactory *factory, const GstCaps *caps);
/* util query functions */
gboolean gst_element_query_position (GstElement *element, GstFormat format, gint64 *cur);
gboolean gst_element_query_duration (GstElement *element, GstFormat format, gint64 *duration);
gboolean gst_element_query_convert (GstElement *element, GstFormat src_format, gint64 src_val,
GstFormat dest_format, gint64 *dest_val);
/* pad functions */
void gst_pad_use_fixed_caps (GstPad *pad);
GstElement* gst_pad_get_parent_element (GstPad *pad);
/* util query functions */
gboolean gst_pad_proxy_query_accept_caps (GstPad *pad, GstQuery *query);
gboolean gst_pad_proxy_query_caps (GstPad *pad, GstQuery *query);
gboolean gst_pad_query_position (GstPad *pad, GstFormat format, gint64 *cur);
gboolean gst_pad_query_duration (GstPad *pad, GstFormat format, gint64 *duration);
gboolean gst_pad_query_convert (GstPad *pad, GstFormat src_format, gint64 src_val,
GstFormat dest_format, gint64 *dest_val);
GstCaps * gst_pad_query_caps (GstPad *pad, GstCaps *filter);
gboolean gst_pad_query_accept_caps (GstPad *pad, GstCaps *caps);
gboolean gst_pad_link_maybe_ghosting (GstPad *src,
GstPad *sink);
gboolean gst_pad_link_maybe_ghosting_full (GstPad *src,
GstPad *sink,
GstPadLinkCheck flags);
gboolean gst_pad_peer_query_position (GstPad *pad, GstFormat format, gint64 *cur);
gboolean gst_pad_peer_query_duration (GstPad *pad, GstFormat format, gint64 *duration);
gboolean gst_pad_peer_query_convert (GstPad *pad, GstFormat src_format, gint64 src_val,
GstFormat dest_format, gint64 *dest_val);
GstCaps * gst_pad_peer_query_caps (GstPad * pad, GstCaps *filter);
gboolean gst_pad_peer_query_accept_caps (GstPad * pad, GstCaps *caps);
gchar * gst_pad_create_stream_id (GstPad * pad, GstElement * parent, const gchar *stream_id) G_GNUC_MALLOC;
gchar * gst_pad_create_stream_id_printf (GstPad * pad, GstElement * parent, const gchar *stream_id, ...) G_GNUC_PRINTF (3, 4) G_GNUC_MALLOC;
gchar * gst_pad_create_stream_id_printf_valist (GstPad * pad, GstElement * parent, const gchar *stream_id, va_list var_args) G_GNUC_PRINTF (3, 0) G_GNUC_MALLOC;
gchar * gst_pad_get_stream_id (GstPad * pad);
GstStream * gst_pad_get_stream (GstPad * pad);
/* bin functions */
void gst_bin_add_many (GstBin *bin, GstElement *element_1, ...) G_GNUC_NULL_TERMINATED;
void gst_bin_remove_many (GstBin *bin, GstElement *element_1, ...) G_GNUC_NULL_TERMINATED;
GstPad * gst_bin_find_unlinked_pad (GstBin *bin, GstPadDirection direction);
gboolean gst_bin_sync_children_states (GstBin *bin);
/* parse utility functions */
GstElement * gst_parse_bin_from_description (const gchar * bin_description,
gboolean ghost_unlinked_pads,
GError ** err);
GstElement * gst_parse_bin_from_description_full (const gchar * bin_description,
gboolean ghost_unlinked_pads,
GstParseContext * context,
GstParseFlags flags,
GError ** err);
GstClockTime gst_util_get_timestamp (void);
/**
* GstSearchMode:
* @GST_SEARCH_MODE_EXACT : Only search for exact matches.
* @GST_SEARCH_MODE_BEFORE: Search for an exact match or the element just before.
* @GST_SEARCH_MODE_AFTER : Search for an exact match or the element just after.
*
* The different search modes.
*/
typedef enum {
GST_SEARCH_MODE_EXACT = 0,
GST_SEARCH_MODE_BEFORE,
GST_SEARCH_MODE_AFTER
} GstSearchMode;
gpointer gst_util_array_binary_search (gpointer array, guint num_elements,
gsize element_size, GCompareDataFunc search_func,
GstSearchMode mode, gconstpointer search_data,
gpointer user_data);
/* fraction operations */
gint gst_util_greatest_common_divisor (gint a, gint b);
gint64 gst_util_greatest_common_divisor_int64 (gint64 a, gint64 b);
void gst_util_fraction_to_double (gint src_n, gint src_d, gdouble *dest);
void gst_util_double_to_fraction (gdouble src, gint *dest_n, gint *dest_d);
gboolean gst_util_fraction_multiply (gint a_n, gint a_d, gint b_n, gint b_d,
gint *res_n, gint *res_d);
gboolean gst_util_fraction_add (gint a_n, gint a_d, gint b_n, gint b_d,
gint *res_n, gint *res_d);
gint gst_util_fraction_compare (gint a_n, gint a_d, gint b_n, gint b_d);
gboolean gst_calculate_linear_regression (const GstClockTime * xy,
GstClockTime * temp, guint n,
GstClockTime * m_num, GstClockTime * m_denom,
GstClockTime * b, GstClockTime * xbase,
gdouble * r_squared);
G_END_DECLS
#endif /* __GST_UTILS_H__ */
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