结构体 AVOptionRanges 

#[repr(C)]
pub struct AVOptionRanges {
    pub range: *mut *mut AVOptionRange,
    pub nb_ranges: c_int,
    pub nb_components: c_int,
}

List of AVOptionRange structs.

Fields

range: *mut *mut AVOptionRange

Array of option ranges.

Most of option types use just one component. Following describes multi-component option types:

AV_OPT_TYPE_IMAGE_SIZE: component index 0: range of pixel count (width * height). component index 1: range of width. component index 2: range of height.

@note To obtain multi-component version of this structure, user must provide AV_OPT_MULTI_COMPONENT_RANGE to av_opt_query_ranges or av_opt_query_ranges_default function.

Multi-component range can be read as in following example:

@code int range_index, component_index; AVOptionRanges *ranges; AVOptionRange *range[3]; //may require more than 3 in the future. av_opt_query_ranges(&ranges, obj, key, AV_OPT_MULTI_COMPONENT_RANGE); for (range_index = 0; range_index < ranges->nb_ranges; range_index++) { for (component_index = 0; component_index < ranges->nb_components; component_index++) range[component_index] = ranges->range[ranges->nb_ranges * component_index + range_index]; //do something with range here. } av_opt_freep_ranges(&ranges); @endcode

nb_ranges: c_int

Number of ranges per component.

nb_components: c_int

Number of components.

trait 实现

impl Clone for AVOptionRanges

fn clone(&self) -> AVOptionRanges

Returns a duplicate of the value. 阅读更多

fn clone_from(&mut self, source: &Self)

从 source 执行拷贝赋值。 阅读更多

impl Debug for AVOptionRanges

fn fmt(&self, f: &mut Formatter<'_>) -> Result

使用给定的格式化器格式化该值。 阅读更多

impl PartialEq for AVOptionRanges

fn eq(&self, other: &AVOptionRanges) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

测试 !=。默认实现几乎总是足够的，没有充分理由不应被重写。

impl Copy for AVOptionRanges

impl Eq for AVOptionRanges

impl StructuralPartialEq for AVOptionRanges