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Miscellaneous
SPA » Utilities

Helper macros and functions. More...

## Files

file | defs.h
| spa/utils/defs.h

## Data Structures

struct | spa_rectangle
struct | spa_point
struct | spa_region
struct | spa_fraction
struct | spa_error_location

## Enumerations

enum | spa_direction { SPA_DIRECTION_INPUT = 0 , SPA_DIRECTION_OUTPUT = 1 }

## Macros

#define | SPA_FALLTHROUGH /* FALLTHROUGH */
| SPA_FALLTHROUGH is an annotation to suppress compiler warnings about switch cases that fall through without a break or return statement.
#define | SPA_FLAG_MASK(field, mask, flag)
#define | SPA_FLAG_IS_SET(field, flag)
#define | SPA_FLAG_SET(field, flag)
#define | SPA_FLAG_CLEAR(field, flag)
#define | SPA_FLAG_UPDATE(field, flag, val)
#define | SPA_DIRECTION_REVERSE(d)
#define | SPA_RECTANGLE(width, height)
#define | SPA_POINT(x, y)
#define | SPA_REGION(x, y, width, height)
#define | SPA_FRACTION(num, denom)
#define | SPA_N_ELEMENTS(arr)
#define | SPA_FOR_EACH_ELEMENT(arr, ptr)
| Array iterator macro.
#define | SPA_FOR_EACH_ELEMENT_VAR(arr, var)
#define | SPA_ABS(a)
#define | SPA_MIN(a, b)
#define | SPA_MAX(a, b)
#define | SPA_CLAMP(v, low, high)
#define | SPA_CLAMPF(v, low, high)
#define | SPA_CLAMPD(v, low, high)
#define | SPA_SWAP(a, b)
#define | SPA_TYPECHECK(type, x)
#define | SPA_CMP(a, b)
| 3-way comparison.
#define | SPA_PTROFF(ptr_, offset_, type_)
| Return the address (buffer + offset) as pointer of type.
#define | SPA_PTROFF_ALIGN(ptr_, offset_, alignment_, type_)
#define | SPA_MEMBER(b, o, t)
| Deprecated, use SPA_PTROFF and SPA_PTROFF_ALIGN instead.
#define | SPA_MEMBER_ALIGN(b, o, a, t)
#define | SPA_CONTAINER_OF(p, t, m)
#define | SPA_PTRDIFF(p1, p2)
#define | SPA_PTR_TO_UINT32(p)
#define | SPA_UINT32_TO_PTR(u)
#define | SPA_TIME_INVALID ((int64_t)INT64_MIN)
#define | SPA_IDX_INVALID ((unsigned int)-1)
#define | SPA_ID_INVALID ((uint32_t)0xffffffff)
#define | SPA_NSEC_PER_SEC (1000000000LL)
#define | SPA_NSEC_PER_MSEC (1000000ll)
#define | SPA_NSEC_PER_USEC (1000ll)
#define | SPA_USEC_PER_SEC (1000000ll)
#define | SPA_USEC_PER_MSEC (1000ll)
#define | SPA_MSEC_PER_SEC (1000ll)
#define | SPA_TIMESPEC_TO_NSEC(ts)
#define | SPA_TIMESPEC_TO_USEC(ts)
#define | SPA_TIMEVAL_TO_NSEC(tv)
#define | SPA_TIMEVAL_TO_USEC(tv)
#define | SPA_PRINTF_FUNC(fmt, arg1)
#define | SPA_FORMAT_ARG_FUNC(arg1)
#define | SPA_ALIGNED(align)
#define | SPA_DEPRECATED
#define | SPA_EXPORT
#define | SPA_SENTINEL
#define | SPA_UNUSED
#define | SPA_NORETURN
#define | SPA_WARN_UNUSED_RESULT
#define | SPA_BARRIER
#define | SPA_API_PROTO static inline
#define | SPA_API_IMPL static inline
#define | SPA_API_UTILS_DEFS SPA_API_IMPL
#define | SPA_RESTRICT
#define | SPA_ROUND_DOWN(num, value)
#define | SPA_ROUND_UP(num, value)
#define | SPA_ROUND_MASK(num, mask)
#define | SPA_ROUND_DOWN_N(num, align)
#define | SPA_ROUND_UP_N(num, align)
#define | SPA_SCALE32(val, num, denom)
#define | SPA_SCALE32_UP(val, num, denom)
#define | SPA_PTR_ALIGNMENT(p, align)
#define | SPA_IS_ALIGNED(p, align)
#define | SPA_PTR_ALIGN(p, align, type)
#define | SPA_LIKELY(x)
#define | SPA_UNLIKELY(x)
#define | spa_ptr_type_inside(p1, s1, p2, type, remaining)
#define | SPA_PTR_TO_INT(p)
#define | SPA_INT_TO_PTR(u)
#define | SPA_STRINGIFY_1(...)
#define | SPA_STRINGIFY(...)
#define | spa_return_if_fail(expr)
#define | spa_return_val_if_fail(expr, val)
#define | spa_assert_se(expr)
#define | spa_nop()
#define | spa_assert(expr)
#define | spa_assert_not_reached()
#define | spa_memzero(x, l)
#define | spa_zero(x)
#define | spa_memcpy(d, s, n)
#define | spa_memmove(d, s, n)
#define | spa_aprintf(_fmt, ...)
#define | spa_alloca(n, size, max_size)

## Functions

SPA_API_UTILS_DEFS bool | spa_ptrinside (const void *p1, size_t s1, const void *p2, size_t s2, size_t *remaining)
SPA_API_UTILS_DEFS bool | spa_ptr_inside_and_aligned (const void *p1, size_t s1, const void *p2, size_t s2, size_t align, size_t *remaining)

## Detailed Description

Helper macros and functions.

## Enumeration Type Documentation

## spa_direction

enum spa_direction

Enumerator
SPA_DIRECTION_INPUT |
SPA_DIRECTION_OUTPUT |

Examples
  export-sink.c, and export-source.c.

## Macro Definition Documentation

## SPA_FALLTHROUGH

#define SPA_FALLTHROUGH /* FALLTHROUGH */

SPA_FALLTHROUGH is an annotation to suppress compiler warnings about switch cases that fall through without a break or return statement.

SPA_FALLTHROUGH is only needed on cases that have code:

switch (foo) { case 1: // These cases have no code. No fallthrough annotations are needed. case 2: case 3: foo = 4; // This case has code, so a fallthrough annotation is needed: SPA_FALLTHROUGH; default: return foo; }

Examples
  video-play-sync.c, and video-src-sync.c.

## SPA_FLAG_MASK

#define SPA_FLAG_MASK | ( |  | field,
|  |  | mask,
|  |  | flag )

Value:
(((field) & (mask)) == (flag))

## SPA_FLAG_IS_SET

#define SPA_FLAG_IS_SET | ( |  | field,
|  |  | flag )

Value:
SPA_FLAG_MASK(field, flag, flag)
SPA_FLAG_MASK
#define SPA_FLAG_MASK(field, mask, flag)
Definition defs.h:88

Examples
  video-src-sync.c.

## SPA_FLAG_SET

#define SPA_FLAG_SET | ( |  | field,
|  |  | flag )

Value:
((field) |= (flag))

Examples
  video-src-sync.c.

## SPA_FLAG_CLEAR

#define SPA_FLAG_CLEAR | ( |  | field,
|  |  | flag )

Examples
  video-play-sync.c.

## SPA_FLAG_UPDATE

#define SPA_FLAG_UPDATE | ( |  | field,
|  |  | flag,
|  |  | val )

Value:
((val) ? SPA_FLAG_SET((field),(flag)) : SPA_FLAG_CLEAR((field),(flag)))
SPA_FLAG_SET
#define SPA_FLAG_SET(field, flag)
Definition defs.h:93
SPA_FLAG_CLEAR
#define SPA_FLAG_CLEAR(field, flag)
Definition defs.h:94

## SPA_DIRECTION_REVERSE

#define SPA_DIRECTION_REVERSE | ( |  | d | ) |

Value:
((d) ^ 1)

## SPA_RECTANGLE

#define SPA_RECTANGLE | ( |  | width,
|  |  | height )

Value:
((struct spa_rectangle){ (width), (height) })
spa_rectangle
Definition defs.h:116

Examples
  local-v4l2.c, spa/examples/local-libcamera.c, spa/examples/local-v4l2.c, spa/examples/local-videotestsrc.c, tutorial5.c, video-play-fixate.c, video-play-pull.c, video-play-reneg.c, video-play-sync.c, video-play.c, video-src-alloc.c, video-src-fixate.c, video-src-reneg.c, video-src-sync.c, and video-src.c.

## SPA_POINT

#define SPA_POINT | ( |  | x,
|  |  | y )

Value:
((struct spa_point){ (x), (y) })
spa_point
Definition defs.h:123

Examples
  video-dsp-src.c, video-src-alloc.c, video-src-fixate.c, video-src-reneg.c, and video-src.c.

## SPA_REGION

#define SPA_REGION | ( |  | x,
|  |  | y,
|  |  | width,
|  |  | height )

Value:
((struct spa_region){ SPA_POINT(x,y), SPA_RECTANGLE(width,height) })
SPA_POINT
#define SPA_POINT(x, y)
Definition defs.h:122
SPA_RECTANGLE
#define SPA_RECTANGLE(width, height)
Definition defs.h:115
spa_region
Definition defs.h:130

Examples
  video-dsp-src.c, video-src-alloc.c, video-src-fixate.c, video-src-reneg.c, and video-src.c.

## SPA_FRACTION

#define SPA_FRACTION | ( |  | num,
|  |  | denom )

Value:
((struct spa_fraction){ (num), (denom) })
spa_fraction
Definition defs.h:137

Examples
  local-v4l2.c, spa/examples/adapter-control.c, spa/examples/local-libcamera.c, spa/examples/local-v4l2.c, spa/examples/local-videotestsrc.c, tutorial5.c, video-play-fixate.c, video-src-alloc.c, video-src-fixate.c, video-src-reneg.c, video-src-sync.c, and video-src.c.

## SPA_N_ELEMENTS

#define SPA_N_ELEMENTS | ( |  | arr | ) |

Value:
(sizeof(arr) / sizeof((arr)[0]))

Examples
  video-play-fixate.c, and video-src-fixate.c.

## SPA_FOR_EACH_ELEMENT

#define SPA_FOR_EACH_ELEMENT | ( |  | arr,
|  |  | ptr )

Value:
for ((ptr) = arr; (ptr) < (arr) + SPA_N_ELEMENTS(arr); (ptr)++)
SPA_N_ELEMENTS
#define SPA_N_ELEMENTS(arr)
Definition defs.h:143

Array iterator macro.

Usage:

struct foo array[16];
struct foo *f;
SPA_FOR_EACH_ELEMENT(array, f) {
f->bar = baz;
}
SPA_FOR_EACH_ELEMENT
#define SPA_FOR_EACH_ELEMENT(arr, ptr)
Array iterator macro.
Definition defs.h:154

## SPA_FOR_EACH_ELEMENT_VAR

#define SPA_FOR_EACH_ELEMENT_VAR | ( |  | arr,
|  |  | var )

Value:
for (__typeof__((arr)[0])* var = arr; (var) < (arr) + SPA_N_ELEMENTS(arr); (var)++)

## SPA_ABS

#define SPA_ABS | ( |  | a | ) |

## SPA_MIN

#define SPA_MIN | ( |  | a,
|  |  | b )

Examples
  audio-src-ring.c, audio-src-ring2.c, audio-src.c, export-sink.c, local-v4l2.c, spa/examples/local-libcamera.c, spa/examples/local-v4l2.c, spa/examples/local-videotestsrc.c, tutorial4.c, video-play-fixate.c, video-play-pull.c, video-play-reneg.c, video-play-sync.c, and video-play.c.

## SPA_MAX

#define SPA_MAX | ( |  | a,
|  |  | b )

## SPA_CLAMP

#define SPA_CLAMP | ( |  | v,
|  |  | low,
|  |  | high )

Examples
  video-dsp-play.c, video-play-pull.c, video-play-sync.c, and video-play.c.

## SPA_CLAMPF

#define SPA_CLAMPF | ( |  | v,
|  |  | low,
|  |  | high )

Examples
  audio-capture.c, audio-dsp-sink.c, and audio-dsp-sink2.c.

## SPA_CLAMPD

#define SPA_CLAMPD | ( |  | v,
|  |  | low,
|  |  | high )

## SPA_SWAP

#define SPA_SWAP | ( |  | a,
|  |  | b )

## SPA_TYPECHECK

#define SPA_TYPECHECK | ( |  | type,
|  |  | x )

## SPA_CMP

#define SPA_CMP | ( |  | a,
|  |  | b )

3-way comparison.

NaN > NaN and NaN > finite numbers

## SPA_PTROFF

#define SPA_PTROFF | ( |  | ptr_,
|  |  | offset_,
|  |  | type_ )

Value:
((type_*)((uintptr_t)(ptr_) + (ptrdiff_t)(offset_)))

Return the address (buffer + offset) as pointer of type.

Examples
  audio-src-ring.c, audio-src-ring2.c, export-source.c, video-dsp-src.c, video-play-pull.c, video-play.c, video-src-alloc.c, video-src-fixate.c, video-src-reneg.c, and video-src.c.

## SPA_PTROFF_ALIGN

#define SPA_PTROFF_ALIGN | ( |  | ptr_,
|  |  | offset_,
|  |  | alignment_,
|  |  | type_ )

Value:
SPA_PTR_ALIGN(SPA_PTROFF(ptr_,offset_,type_),alignment_,type_)
SPA_PTR_ALIGN
#define SPA_PTR_ALIGN(p, align, type)
Definition defs.h:386
SPA_PTROFF
#define SPA_PTROFF(ptr_, offset_, type_)
Return the address (buffer + offset) as pointer of type.
Definition defs.h:222

## SPA_MEMBER

#define SPA_MEMBER | ( |  | b,
|  |  | o,
|  |  | t )

Value:
SPA_PTROFF(b,o,t)

Deprecated, use SPA_PTROFF and SPA_PTROFF_ALIGN instead.

## SPA_MEMBER_ALIGN

#define SPA_MEMBER_ALIGN | ( |  | b,
|  |  | o,
|  |  | a,
|  |  | t )

Value:
SPA_PTROFF_ALIGN(b,o,a,t)
SPA_PTROFF_ALIGN
#define SPA_PTROFF_ALIGN(ptr_, offset_, alignment_, type_)
Definition defs.h:223

## SPA_CONTAINER_OF

#define SPA_CONTAINER_OF | ( |  | p,
|  |  | t,
|  |  | m )

Value:
((t*)((uintptr_t)(p) - offsetof(t,m)))

## SPA_PTRDIFF

#define SPA_PTRDIFF | ( |  | p1,
|  |  | p2 )

Value:
((intptr_t)(p1) - (intptr_t)(p2))

## SPA_PTR_TO_UINT32

#define SPA_PTR_TO_UINT32 | ( |  | p | ) |

Value:
((uint32_t) ((uintptr_t) (p)))

## SPA_UINT32_TO_PTR

#define SPA_UINT32_TO_PTR | ( |  | u | ) |

Value:
((void*) ((uintptr_t) (u)))

## SPA_TIME_INVALID

#define SPA_TIME_INVALID ((int64_t)INT64_MIN)

## SPA_IDX_INVALID

#define SPA_IDX_INVALID ((unsigned int)-1)

## SPA_ID_INVALID

#define SPA_ID_INVALID ((uint32_t)0xffffffff)

Examples
  export-sink.c, export-source.c, export-spa-device.c, internal.c, and midi-src.c.

## SPA_NSEC_PER_SEC

#define SPA_NSEC_PER_SEC (1000000000LL)

Examples
  midi-src.c.

## SPA_NSEC_PER_MSEC

#define SPA_NSEC_PER_MSEC (1000000ll)

Examples
  audio-dsp-filter.c, tutorial7.c, video-dsp-src.c, video-play-pull.c, video-src-alloc.c, video-src-fixate.c, video-src-reneg.c, video-src-sync.c, and video-src.c.

## SPA_NSEC_PER_USEC

#define SPA_NSEC_PER_USEC (1000ll)

## SPA_USEC_PER_SEC

#define SPA_USEC_PER_SEC (1000000ll)

## SPA_USEC_PER_MSEC

#define SPA_USEC_PER_MSEC (1000ll)

## SPA_MSEC_PER_SEC

#define SPA_MSEC_PER_SEC (1000ll)

## SPA_TIMESPEC_TO_NSEC

#define SPA_TIMESPEC_TO_NSEC | ( |  | ts | ) |

Value:
((ts)->tv_sec * SPA_NSEC_PER_SEC + (ts)->tv_nsec)
SPA_NSEC_PER_SEC
#define SPA_NSEC_PER_SEC
Definition defs.h:253

## SPA_TIMESPEC_TO_USEC

#define SPA_TIMESPEC_TO_USEC | ( |  | ts | ) |

Value:
((ts)->tv_sec * SPA_USEC_PER_SEC + (ts)->tv_nsec / SPA_NSEC_PER_USEC)
SPA_NSEC_PER_USEC
#define SPA_NSEC_PER_USEC
Definition defs.h:257
SPA_USEC_PER_SEC
#define SPA_USEC_PER_SEC
Definition defs.h:259

## SPA_TIMEVAL_TO_NSEC

#define SPA_TIMEVAL_TO_NSEC | ( |  | tv | ) |

Value:
((tv)->tv_sec * SPA_NSEC_PER_SEC + (tv)->tv_usec * SPA_NSEC_PER_USEC)

## SPA_TIMEVAL_TO_USEC

#define SPA_TIMEVAL_TO_USEC | ( |  | tv | ) |

Value:
((tv)->tv_sec * SPA_USEC_PER_SEC + (tv)->tv_usec)

## SPA_PRINTF_FUNC

#define SPA_PRINTF_FUNC | ( |  | fmt,
|  |  | arg1 )

## SPA_FORMAT_ARG_FUNC

#define SPA_FORMAT_ARG_FUNC | ( |  | arg1 | ) |

## SPA_ALIGNED

#define SPA_ALIGNED | ( |  | align | ) |

## SPA_DEPRECATED

#define SPA_DEPRECATED

## SPA_EXPORT

#define SPA_EXPORT

## SPA_SENTINEL

#define SPA_SENTINEL

## SPA_UNUSED

#define SPA_UNUSED

## SPA_NORETURN

#define SPA_NORETURN

## SPA_WARN_UNUSED_RESULT

#define SPA_WARN_UNUSED_RESULT

## SPA_BARRIER

#define SPA_BARRIER

## SPA_API_PROTO

#define SPA_API_PROTO static inline

## SPA_API_IMPL

#define SPA_API_IMPL static inline

## SPA_API_UTILS_DEFS

#define SPA_API_UTILS_DEFS SPA_API_IMPL

## SPA_RESTRICT

#define SPA_RESTRICT

## SPA_ROUND_DOWN

#define SPA_ROUND_DOWN | ( |  | num,
|  |  | value )

## SPA_ROUND_UP

#define SPA_ROUND_UP | ( |  | num,
|  |  | value )

## SPA_ROUND_MASK

#define SPA_ROUND_MASK | ( |  | num,
|  |  | mask )

Value:
((__typeof__(num))((mask)-1))

## SPA_ROUND_DOWN_N

#define SPA_ROUND_DOWN_N | ( |  | num,
|  |  | align )

Value:
((num) & ~SPA_ROUND_MASK(num, align))
SPA_ROUND_MASK
#define SPA_ROUND_MASK(num, mask)
Definition defs.h:359

## SPA_ROUND_UP_N

#define SPA_ROUND_UP_N | ( |  | num,
|  |  | align )

Value:
((((num)-1) | SPA_ROUND_MASK(num, align))+1)

Examples
  video-dsp-src.c, video-src-alloc.c, video-src-fixate.c, video-src-reneg.c, video-src-sync.c, and video-src.c.

## SPA_SCALE32

#define SPA_SCALE32 | ( |  | val,
|  |  | num,
|  |  | denom )

## SPA_SCALE32_UP

#define SPA_SCALE32_UP | ( |  | val,
|  |  | num,
|  |  | denom )

## SPA_PTR_ALIGNMENT

#define SPA_PTR_ALIGNMENT | ( |  | p,
|  |  | align )

Value:
((uintptr_t)(p) & ((align)-1))

## SPA_IS_ALIGNED

#define SPA_IS_ALIGNED | ( |  | p,
|  |  | align )

Value:
(SPA_PTR_ALIGNMENT(p,align) == 0)
SPA_PTR_ALIGNMENT
#define SPA_PTR_ALIGNMENT(p, align)
Definition defs.h:382

## SPA_PTR_ALIGN

#define SPA_PTR_ALIGN | ( |  | p,
|  |  | align,
|  |  | type )

Value:
((type*)SPA_ROUND_UP_N((intptr_t)(p), (intptr_t)(align)))
SPA_ROUND_UP_N
#define SPA_ROUND_UP_N(num, align)
Definition defs.h:364

## SPA_LIKELY

#define SPA_LIKELY | ( |  | x | ) |

Value:
(x)

## SPA_UNLIKELY

#define SPA_UNLIKELY | ( |  | x | ) |

Value:
(x)

## spa_ptr_type_inside

#define spa_ptr_type_inside | ( |  | p1,
|  |  | s1,
|  |  | p2,
|  |  | type,
|  |  | remaining )

Value:
spa_ptr_inside_and_aligned(p1, s1, p2, sizeof(type), SPA_ALIGNOF(type), remaining)
SPA_ALIGNOF
#define SPA_ALIGNOF
Definition defs.h:42
spa_ptr_inside_and_aligned
SPA_API_UTILS_DEFS bool spa_ptr_inside_and_aligned(const void *p1, size_t s1, const void *p2, size_t s2, size_t align, size_t *remaining)
Definition defs.h:417

## SPA_PTR_TO_INT

#define SPA_PTR_TO_INT | ( |  | p | ) |

Value:
((int) ((intptr_t) (p)))

## SPA_INT_TO_PTR

#define SPA_INT_TO_PTR | ( |  | u | ) |

Value:
((void*) ((intptr_t) (u)))

## SPA_STRINGIFY_1

#define SPA_STRINGIFY_1 | ( |  | ... | ) |

Value:
#__VA_ARGS__

## SPA_STRINGIFY

#define SPA_STRINGIFY | ( |  | ... | ) |

Value:
SPA_STRINGIFY_1(__VA_ARGS__)
SPA_STRINGIFY_1
#define SPA_STRINGIFY_1(...)
Definition defs.h:439

## spa_return_if_fail

#define spa_return_if_fail | ( |  | expr | ) |

## spa_return_val_if_fail

#define spa_return_val_if_fail | ( |  | expr,
|  |  | val )

## spa_assert_se

#define spa_assert_se | ( |  | expr | ) |

## spa_nop

#define spa_nop | ( |  | ) |

Value:
do {} while (false)

## spa_assert

#define spa_assert | ( |  | expr | ) |

Value:
spa_assert_se(expr)
spa_assert_se
#define spa_assert_se(expr)
Definition defs.h:472

Examples
  audio-src-ring.c, audio-src-ring2.c, and midi-src.c.

## spa_assert_not_reached

#define spa_assert_not_reached | ( |  | ) |

## spa_memzero

#define spa_memzero | ( |  | x,
|  |  | l )

Value:
(memset((x), 0, (l)))

## spa_zero

#define spa_zero | ( |  | x | ) |

Value:
(spa_memzero(&(x), sizeof(x)))
spa_memzero
#define spa_memzero(x, l)
Definition defs.h:511

Examples
  export-sink.c, export-source.c, gmain.c, spa/examples/adapter-control.c, tutorial2.c, and tutorial6.c.

## spa_memcpy

#define spa_memcpy | ( |  | d,
|  |  | s,
|  |  | n )

Value:
memcpy(d,s,n)

## spa_memmove

#define spa_memmove | ( |  | d,
|  |  | s,
|  |  | n )

Value:
memmove(d,s,n)

## spa_aprintf

#define spa_aprintf | ( |  | _fmt,
|  |  | ... )

Examples
  local-v4l2.c, spa/examples/adapter-control.c, spa/examples/example-control.c, spa/examples/local-libcamera.c, spa/examples/local-v4l2.c, and spa/examples/local-videotestsrc.c.

## spa_alloca

#define spa_alloca | ( |  | n,
|  |  | size,
|  |  | max_size )

## Function Documentation

## spa_ptrinside()

SPA_API_UTILS_DEFS bool spa_ptrinside | ( | const void * | p1,
|  | size_t | s1,
|  | const void * | p2,
|  | size_t | s2,
|  | size_t * | remaining )

## spa_ptr_inside_and_aligned()

SPA_API_UTILS_DEFS bool spa_ptr_inside_and_aligned | ( | const void * | p1,
|  | size_t | s1,
|  | const void * | p2,
|  | size_t | s2,
|  | size_t | align,
|  | size_t * | remaining )