High level syntax for video coding and decoding

A method of encoding video data into a bitstream, the bitstream comprising video data corresponding to one or more slices,

• wherein the bitstream comprises a header comprising syntax elements to be used when decoding a picture including one or more slices, and a slice header comprising syntax elements to be used when decoding a slice, the method comprising:
• encoding, in the picture header, at least one syntax element indicating whether a decoding tool of LMCS (Luma Mapping with Chroma Scaling) is enabled for the picture;
• when the decoding tool is enabled for the picture, encoding, in the picture header, at least one syntax element related to an ID of LMCS APS (Adaptation Parameter Set) for the decoding tool of LMCS;
• and
• when the decoding tool of LMCS is enabled for the picture, encoding in a slice header at least one syntax element indicating whether the decoding tool of LMCS is to be used for the slice immediately after a syntax element related to an ID of ALF (Adaptive Loop Filter) APS in the slice header, and prior to syntax elements related to one or more decoding tools.

A device for decoding video data from a bitstream, the bitstream comprising video data corresponding to one or more slices, wherein the bitstream comprises a picture header comprising syntax elements to be used when decoding a picture including one or more slices, and a slice header comprising syntax elements to be used when decoding a slice, the device comprising:

• a picture header parser which parses, from the picture header, at least one syntax element indicating whether a decoding tool of LMCS (Luma Mapping with Chroma Scaling) is enabled for the picture, and
• when the decoding tool of LMCS is enabled for the picture, parses from the picture header, at least one syntax element related to an ID of LMCS APS (Adaptation Parameter Set) for the decoding tool of LMCS;
• and
• a slice header parser which, when the decoding tool of LMCS is enabled for the picture, parses from a slice header at least one syntax element indicating whether the decoding tool of LMCS is to be used for the slice immediately after a syntax element related to an ID of ALF (Adaptive Loop Filter) APS in the slice header and prior to syntax elements related to one or more decoding tools;
• and
• a decoder which decodes the video data from the bitstream using said syntax elements.

A device for encoding video data into a bitstream, the bitstream comprising video data corresponding to one or more slices, wherein the bitstream comprises a header comprising syntax elements to be used when decoding a picture including one or more slices, and a slice header comprising syntax elements to be used when decoding a slice, the device comprising:

• a picture header encoder which encodes, in the picture header, at least one syntax element indicating whether a decoding tool of LMCS (Luma Mapping with Chroma Scaling) is enabled for the picture, and
• when the decoding tool is enabled for the picture, encodes in the picture header, at least one syntax element related to an ID of LMCS APS (Adaptation Parameter Set) for the decoding tool of LMCS;
• and
• a slice header encoder which, when the decoding tool of LMCS is enabled for the picture, encodes in a slice header at least one syntax element indicating whether the decoding tool of LMCS is to be used for the slice immediately after a syntax element related to an ID of ALF (Adaptive Loop Filter) APS in the slice header, and prior to syntax elements related to one or more decoding tools.

A non-transitory computer readable medium having stored thereon processor executable instructions that, when executed by a processor, cause the processor to perform a method of decoding video data from a bitstream, the bitstream comprising video data corresponding to one or more slices, wherein the bitstream comprises a picture header comprising syntax elements to be used when decoding a picture including one or more slices, and a slice header comprising syntax elements to be used when decoding a slice, the method comprising:

• parsing, from the picture header, at least one syntax element indicating whether a decoding tool of LMCS (Luma Mapping with Chroma Scaling) is enabled for the picture;
• when the decoding tool of LMCS is enabled for the picture, parsing, from the picture header, at least one syntax element related to an ID of LMCS APS (Adaptation Parameter Set) for the decoding tool of LMCS;
• when the decoding tool of LMCS is enabled for the picture, parsing, from the picture header, at least one syntax element related to an ID of LMCS APS (Adaptation Parameter Set) for the decoding tool of LMCS;
• when the decoding tool of LMCS is enabled for the picture, parsing from a slice header at least one syntax element indicating whether the decoding tool of LMCS is to be used for the slice immediately after a syntax element related to an ID of ALF (Adaptive Loop Filter) APS in the slice header, and prior to syntax elements related to one or more decoding tools;
• and
• decoding the video data from the bitstream using said syntax elements.

A non-transitory computer readable medium having stored thereon processor executable instructions that, when executed by a processor, cause the processor to perform a method of encoding video data into a bitstream, the bitstream comprising video data corresponding to one or more slices, wherein the bitstream comprises a header comprising syntax elements to be used when decoding a picture including one or more slices, and a slice header comprising syntax elements to be used when decoding a slice, the method comprising:

• encoding, in the picture header, at least one syntax element indicating whether a decoding tool of LMCS (Luma Mapping with Chroma Scaling) is enabled for the picture;
• when the decoding tool is enabled for the picture, encoding, in the picture header, at least one syntax element related to an ID of LMCS APS (Adaptation Parameter Set) for the decoding tool of LMCS;
• and
• when the decoding tool of LMCS is enabled for the picture, encoding in a slice header at least one syntax element indicating whether the decoding tool of LMCS is to be used for the slice immediately after a syntax element related to an ID of ALF (Adaptive Loop Filter) APS in the slice header, and prior to syntax elements related to one or more decoding tools.