Struct SpsExtended

pub struct SpsExtended {
    pub chroma_format_idc: u8,
    pub separate_color_plane_flag: bool,
    pub bit_depth_luma_minus8: u8,
    pub bit_depth_chroma_minus8: u8,
    pub qpprime_y_zero_transform_bypass_flag: bool,
    pub scaling_matrix: Vec<Vec<i64>>,
}

The Sequence Parameter Set extension. ISO/IEC-14496-10-2022 - 7.3.2

Fields

chroma_format_idc: u8

The chroma_format_idc as a u8. This is the chroma sampling relative to the luma sampling specified in subclause 6.2.

The value of this ranges from [0, 3].

This is a variable number of bits as it is encoded by an exp golomb (unsigned). The smallest encoding would be for 0 which is encoded as 1, which is a single bit. The largest encoding would be for 3 which is encoded as 0 0100, which is 5 bits. ISO/IEC-14496-10-2022 - 7.4.2.1.1

For more information:

https://en.wikipedia.org/wiki/Exponential-Golomb_coding

separate_color_plane_flag: bool

The separate_colour_plane_flag is a single bit.

0 means the the color components aren’t coded separately and ChromaArrayType is set to chroma_format_idc.

1 means the 3 color components of the 4:4:4 chroma format are coded separately and ChromaArrayType is set to 0.

ISO/IEC-14496-10-2022 - 7.4.2.1.1

bit_depth_luma_minus8: u8

The bit_depth_luma_minus8 as a u8. This is the chroma sampling relative to the luma sampling specified in subclause 6.2.

The value of this ranges from [0, 6].

This is a variable number of bits as it is encoded by an exp golomb (unsigned). The smallest encoding would be for 0 which is encoded as 1, which is a single bit. The largest encoding would be for 6 which is encoded as 0 0111, which is 5 bits. ISO/IEC-14496-10-2022 - 7.4.2.1.1

For more information:

https://en.wikipedia.org/wiki/Exponential-Golomb_coding

bit_depth_chroma_minus8: u8

The bit_depth_chroma_minus8 as a u8. This is the chroma sampling relative to the luma sampling specified in subclause 6.2.

The value of this ranges from [0, 6].

This is a variable number of bits as it is encoded by an exp golomb (unsigned). The smallest encoding would be for 0 which is encoded as 1, which is a single bit. The largest encoding would be for 6 which is encoded as 0 0111, which is 5 bits. ISO/IEC-14496-10-2022 - 7.4.2.1.1

For more information:

https://en.wikipedia.org/wiki/Exponential-Golomb_coding

qpprime_y_zero_transform_bypass_flag: bool

The qpprime_y_zero_transform_bypass_flag is a single bit.

0 means the transform coefficient decoding and picture construction processes wont use the transform bypass operation.

1 means that when QP’_Y is 0 then a transform bypass operation for the transform coefficient decoding and picture construction processes will be applied before the deblocking filter process from subclause 8.5.

ISO/IEC-14496-10-2022 - 7.4.2.1.1

scaling_matrix: Vec<Vec<i64>>

The scaling_matrix. If the length is nonzero, then seq_scaling_matrix_present_flag must have been set.

Implementations

impl SpsExtended

pub fn parse<T: Read>(reader: &mut BitReader<T>) -> Result<Self>

Parses an extended SPS from a bitstream. Returns an SpsExtended struct.

pub fn build<T: Write>(&self, writer: &mut BitWriter<T>) -> Result<()>

Builds the SPSExtended struct into a byte stream. Returns a built byte stream.

pub fn bitsize(&self) -> u64

Returns the total bits of the SpsExtended struct.

Note that this isn’t the bytesize since aligning it may cause some values to be different.

pub fn bytesize(&self) -> u64

Returns the total bytes of the SpsExtended struct.

Note that this calls SpsExtended::bitsize() and calculates the number of bytes including any necessary padding such that the bitstream is byte aligned.

Trait Implementations

impl Clone for SpsExtended

fn clone(&self) -> SpsExtended

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SpsExtended

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

Formats the value using the given formatter.

impl Default for SpsExtended

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for SpsExtended

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

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

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for SpsExtended

impl StructuralPartialEq for SpsExtended