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US 11,910,022 B2Granted
Decoded picture buffer memory allocation and picture output in scalable video coding
AssigneeBytedance Inc.
InventorYe-kui Wang
Life of this patent
Estimating the term…
Abstract
Methods and apparatus for video processing, including coding and decoding, are described. One example video processing method includes performing a conversion between a video having one or more video layers and a bitstream of the video according to a format rule, and wherein the format rule specifies that a value of a flag that indicates whether to remove pictures previously decoded and stored in a decoded picture buffer from the decoded picture buffer when decoding an access unit of a certain type is included in the bitstream.
Claims19
A method of video processing, comprising:
- performing a conversion between a video having one or more video layers and a bitstream of the video according to a format rule,
- wherein the format rule specifies that a value of a flag that indicates whether to remove pictures previously decoded and stored in a decoded picture buffer from the decoded picture buffer when decoding an access unit of a certain type is included in the bitstream,
- wherein the format rule specifies that a value of a variable that indicates whether pictures in the decoded picture buffer prior to a current picture in decoding order in the bitstream are output before the pictures are removed from the decoded picture buffer is set to a predetermined value when a first condition related with a greatest allowed value of a chroma format indicator or a greatest allowed value of a bit depth used to represent pixels of the video is satisfied,
- wherein the value of the variable is set to the value of the flag when the first condition is not satisfied, and
- wherein the first condition is not satisfied when a color format or a bit depth of pictures changes but the greatest allowed value of the chroma format indicator or the greatest allowed value of the bit depth does not change.
2 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 video having one or more video layers and a bitstream of the video according to a format rule,
- wherein the format rule specifies that a value of a flag that indicates whether to remove pictures previously decoded and stored in a decoded picture buffer from the decoded picture buffer when decoding an access unit of a certain type is included in the bitstream,
- wherein the format rule specifies that a value of a variable that indicates whether pictures in the decoded picture buffer prior to a current picture in decoding order in the bitstream are output before the pictures are removed from the decoded picture buffer is set to a predetermined value when a first condition related with a greatest allowed value of a chroma format indicator or a greatest allowed value of a bit depth used to represent pixels of the video is satisfied,
- wherein the value of the variable is set to the value of the flag when the first condition is not satisfied, and
- wherein the first condition is not satisfied when a color format or a bit depth of pictures changes but the greatest allowed value of the chroma format indicator or the greatest allowed value of the bit depth does not change.
2 more elements
A non-transitory computer-readable storage medium storing instructions that cause a processor to:
- perform a conversion between a video having one or more video layers and a bitstream of the video according to a format rule,
- wherein the format rule specifies that a value of a flag that indicates whether to remove pictures previously decoded and stored in a decoded picture buffer from the decoded picture buffer when decoding an access unit of a certain type is included in the bitstream,
- wherein the format rule specifies that a value of a variable that indicates whether pictures in the decoded picture buffer prior to a current picture in decoding order in the bitstream are output before the pictures are removed from the decoded picture buffer is set to a predetermined value when a first condition related with a greatest allowed value of a chroma format indicator or a greatest allowed value of a bit depth used to represent pixels of the video is satisfied,
- wherein the value of the variable is set to the value of the flag when the first condition is not satisfied, and
- wherein the first condition is not satisfied when a color format or a bit depth of pictures changes but the greatest allowed value of the chroma format indicator or the greatest allowed value of the bit depth does not change.
2 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 the bitstream of the video having one or more video layers according to a format rule,
- wherein the format rule specifies that a value of a flag that indicates whether to remove pictures previously decoded and stored in a decoded picture buffer from the decoded picture buffer when decoding an access unit of a certain type is included in the bitstream,
- wherein the format rule specifies that a value of a variable that indicates whether pictures in the decoded picture buffer prior to a current picture in decoding order in the bitstream are output before the pictures are removed from the decoded picture buffer is set to a predetermined value when a first condition related with a greatest allowed value of a chroma format indicator or a greatest allowed value of a bit depth used to represent pixels of the video is satisfied,
- wherein the value of the variable is set to the value of the flag when the first condition is not satisfied, and
- wherein the first condition is not satisfied when a color format or a bit depth of pictures changes but the greatest allowed value of the chroma format indicator or the greatest allowed value of the bit depth does not change.
2 more elements
Dependencies are inferred from the claim text.