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US 12,341,980 B2Granted
General constraints information for video coding
AssigneesBeijing Bytedance Network Technology Co., Ltd., Bytedance Inc.
InventorsWeijia Zhu, Jizheng Xu, Li Zhang, Kai Zhang, Yue Wang
Life of this patent
Estimating the term…
Abstract
A method for implementing an adaptive color transform (ACT) during image/video encoding and decoding, includes determining, for a conversion between a video including a block and a bitstream of the video, that a size of the block is greater than a maximum allowed size for an ACT mode, and performing, based on the determining, the conversion, wherein, in response to the size of the block being greater than the maximum allowed size for the ACT mode, the block is partitioned into multiple sub-blocks, and wherein each of the multiple sub-blocks share a same prediction mode, and the ACT mode is enabled at a sub-block level.
Claims18
A method of processing video data, comprising:
- performing a conversion between a current video unit of a video and a bitstream of the video,
- wherein the bitstream conforms to a format rule,
- wherein the format rule specifies whether a first flag is included in the bitstream, wherein the first flag comprises second general constraints information for one or more pictures in a set of output layers of the video, and wherein the first flag indicates whether a second flag in a sequence parameter set (SPS) of the bitstream specifies that a pulse code modulation mode for the current video unit is disabled,
- wherein the format rule further specifies whether a third flag is included in the bitstream, the third flag comprising general constraints information for the one or more pictures in the set of output layers of the video,
- wherein the second flag is equal to zero in response to the third flag being equal to one, wherein the second flag being equal to zero specifies that the pulse code modulation mode is disabled for the current video unit,
- wherein the third flag indicates whether a fourth flag in the SPS of the bitstream specifies that a resampling mode for the current video unit is disabled, and
- wherein in response to the resampling mode being disabled, a current picture and a reference picture share same position offsets included in a picture parameter set (PPS), and the position offsets are used to calculate a scaling ratio.
4 more elements
An apparatus for processing video data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:
- perform a conversion between a current video unit of a video and a bitstream of the video,
- wherein the bitstream conforms to a format rule,
- wherein the format rule specifies whether a first flag is included in the bitstream, wherein the first flag comprises second general constraints information for one or more pictures in a set of output layers of the video, and wherein the first flag indicates whether a second flag in a sequence parameter set (SPS) of the bitstream specifies that a pulse code modulation mode for the current video unit is disabled,
- wherein the format rule further specifies whether a third flag is included in the bitstream, the third flag comprising general constraints information for the one or more pictures in the set of output layers of the video,
- wherein the second flag is equal to zero in response to the third flag being equal to one, wherein the second flag being equal to zero specifies that the pulse code modulation mode is disabled for the current video unit,
- wherein the third flag indicates whether a fourth flag in the SPS of the bitstream specifies that a resampling mode for the current video unit is disabled, and
- wherein in response to the resampling mode being disabled, a current picture and a reference picture share same position offsets included in a picture parameter set (PPS), and the position offsets are used to calculate a scaling ratio.
4 more elements
A non-transitory computer-readable storage medium storing instructions that cause a processor to:
- perform a conversion between a current video unit of a video and a bitstream of the video,
- wherein the bitstream conforms to a format rule,
- wherein the format rule specifies whether a first flag is included in the bitstream, wherein the first flag comprises second general constraints information for one or more pictures in a set of output layers of the video, and wherein the first flag indicates whether a second flag in a sequence parameter set (SPS) of the bitstream specifies that a pulse code modulation mode for the current video unit is disabled,
- wherein the format rule further specifies whether a third flag is included in the bitstream, the third flag comprising general constraints information for the one or more pictures in the set of output layers of the video,
- wherein the second flag is equal to zero in response to the third flag being equal to one, wherein the second flag being equal to zero specifies that the pulse code modulation mode is disabled for the current video unit,
- wherein the third flag indicates whether a fourth flag in the SPS of the bitstream specifies that a resampling mode for the current video unit is disabled, and
- wherein in response to the resampling mode being disabled, a current picture and a reference picture share same position offsets included in a picture parameter set (PPS), and the position offsets are used to calculate a scaling ratio.
4 more elements
A non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by a video processing apparatus, wherein the method comprises:
- generating a bitstream for a current video unit of a video,
- wherein the bitstream conforms to a format rule,
- wherein the format rule specifies whether a first flag is included in the bitstream, wherein the first flag comprises second general constraints information for one or more pictures in a set of output layers of the video, and wherein the first flag indicates whether a second flag in a sequence parameter set (SPS) of the bitstream specifies that a pulse code modulation mode for the current video unit is disabled,
- wherein the format rule further specifies whether a third flag is included in the bitstream, the third flag comprising general constraints information for the one or more pictures in the set of output layers of the video,
- wherein the second flag is equal to zero in response to the third flag being equal to one, wherein the second flag being equal to zero specifies that the pulse code modulation mode is disabled for the current video unit,
- wherein the third flag indicates whether a fourth flag in the SPS of the bitstream specifies that a resampling mode for the current video unit is disabled, and
- wherein in response to the resampling mode being disabled, a current picture and a reference picture share same position offsets included in a picture parameter set (PPS), and the position offsets are used to calculate a scaling ratio.
4 more elements
Dependencies are inferred from the claim text.