vlc_picture_pool.h File Reference

This file defines picture pool structures and functions in vlc. More...

Include dependency graph for vlc_picture_pool.h:

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Typedefs
typedef struct picture_pool_t	picture_pool_t
	Picture pool handle.

Functions
picture_pool_t *	picture_pool_New (unsigned count, picture_t *const *tab)
	Creates a pool of preallocated pictures.
picture_pool_t *	picture_pool_NewFromFormat (const video_format_t *fmt, unsigned count)
	Allocates pictures from the heap and creates a picture pool with them.
void	picture_pool_Release (picture_pool_t *)
	Releases a pool created by picture_pool_New() or picture_pool_NewFromFormat().
picture_t *	picture_pool_Get (picture_pool_t *)
	Obtains a picture from a pool if any is immediately available.
picture_t *	picture_pool_Wait (picture_pool_t *)
	Obtains a picture from a pool.

Detailed Description

This file defines picture pool structures and functions in vlc.

Typedef Documentation

picture_pool_t

typedef struct picture_pool_t picture_pool_t

Picture pool handle.

Function Documentation

picture_pool_Get()

picture_t * picture_pool_Get

(

picture_pool_t *

pool

)

Obtains a picture from a pool if any is immediately available.

The picture must be released with picture_Release().

Returns

a picture, or NULL if all pictures in the pool are allocated

Note

This function is thread-safe.

References picture_pool_t::available, picture_pool_t::lock, picture_pool_ClonePicture(), picture_pool_t::refs, vlc_atomic_rc_get(), vlc_mutex_lock(), and vlc_mutex_unlock().

Referenced by PrerenderPicture(), SourceConverterBuffer(), and VoutVideoFilterInteractiveNewPicture().

picture_pool_New()

picture_pool_t * picture_pool_New	(	unsigned	count,
		picture_t *const *	tab
	)

Creates a pool of preallocated pictures.

Free pictures can be allocated from the pool, and are returned to the pool when they are no longer referenced.

This avoids allocating and deallocationg pictures repeatedly, and ensures that memory consumption remains within limits.

To obtain a picture from the pool, use picture_pool_Get(). To increase and decrease the reference count, use picture_Hold() and picture_Release() respectively.

Parameters

count	number of pictures in the array
tab	array of pictures

Returns

a pointer to the new pool on success, or NULL on error (pictures are not released on error)

References aligned_alloc(), picture_pool_t::available, count, picture_pool_t::lock, picture_pool_t::picture, picture_pool_t::picture_count, POOL_MAX, picture_pool_t::refs, unlikely, vlc_atomic_rc_init(), vlc_cond_init(), vlc_mutex_init(), and picture_pool_t::wait.

Referenced by picture_pool_NewFromFormat().

picture_pool_NewFromFormat()

picture_pool_t * picture_pool_NewFromFormat	(	const video_format_t *	fmt,
		unsigned	count
	)

Allocates pictures from the heap and creates a picture pool with them.

This is a convenience wrapper for picture_NewFromFormat() and picture_pool_New().

Parameters

fmt	video format of pictures to allocate from the heap
count	number of pictures to allocate

Returns

a pointer to the new pool on success, NULL on error

References count, picture_NewFromFormat(), picture_pool_New(), picture_Release(), POOL_MAX, unlikely, and vlc_assert_unreachable.

Referenced by ChangeFilters(), ModuleThread_UpdateVideoFormat(), vout_Start(), and VoutSetupConverter().

picture_pool_Release()

void picture_pool_Release

(

picture_pool_t *

pool

)

Releases a pool created by picture_pool_New() or picture_pool_NewFromFormat().

Note

If there are no pending references to the pooled pictures, and the picture_resource_t.pf_destroy callback was not NULL, it will be invoked. Otherwise the default callback will be used.

Warning

If there are pending references (a.k.a. late pictures), the pictures will remain valid until the all pending references are dropped by picture_Release().

References picture_pool_t::picture, picture_pool_t::picture_count, picture_pool_Destroy(), and picture_Release().

Referenced by ChangeFilters(), CreateVoutIfNeeded(), DeleteDecoder(), vout_ReleaseDisplay(), vout_Start(), VoutConverterRelease(), and VoutSetupConverter().

picture_pool_Wait()

picture_t * picture_pool_Wait

(

picture_pool_t *

pool

)

Obtains a picture from a pool.

The picture must be released with picture_Release().

Returns

a picture or NULL on memory error

Note

This function is thread-safe.

References picture_pool_t::available, picture_pool_t::lock, picture_pool_ClonePicture(), picture_pool_t::refs, vlc_atomic_rc_get(), vlc_cond_wait(), vlc_mutex_lock(), vlc_mutex_unlock(), and picture_pool_t::wait.

Referenced by ModuleThread_NewVideoBuffer().