METHOD AND APPARATUS FOR PROCESSING VIDEO CONTENT WITH ALF and CCALF
The present disclosure provides systems and methods for processing video content. The method can include: receiving a bitstream comprising video content; determining whether a first signal associated with the video content satisfies a given condition; and in response to the determination that the first signal satisfies the given condition, disabling both a cross component adaptive loop filter (CCALF) process and a chroma adaptive loop filter (ALF) process.
1 . A video decoding method, comprising:
receiving a bitstream associated with video content;
decoding, from coded information of the bitstream, a first signal;
determining, based on the first signal, whether an adaptation parameter set (APS) network-abstraction-layer (NAL) unit is present in the bitstream; and
in response to a determination that the APS NAL unit is not present in the bitstream, disabling a chroma adaptive loop filter (ALF) process,
wherein the disabling of the chroma ALF process comprises decoding one or more slice-level flags indicating that the chroma ALF is disabled, and disabling the chroma ALF process based on decoded values of the one or more slice-level flags.
2 . The method according to claim 1 , wherein the one or more slice-level flags comprise:
a first slice-level flag corresponding to a chroma ALF process of a chroma component Cb, and a second slice-level flag corresponding to a chroma ALF process of a chroma component Cr.
3 . The method according to claim 1 , wherein the decoded values of the one or more slice-level flags are equal to 0 for all of one or more pictures in a coded layer video sequence (CLVS) associated with the video content.
4 . The method according to claim 1 , further comprising:
in response to a determination that the APS NAL unit is not present in the bitstream, performing a luma ALF process using a predetermined set of filters.
5 . The method according to claim 4 , wherein performing the luma ALF process using the predetermined set of filters further comprises:
decoding, from the coded information of the bitstream, a third slice-level flag, and
performing the luma ALF process based on a decoded value of the third slice-level flag.
6 . The method according to claim 5 , wherein the decoded value of the third slice-level flag is equal to 0 for all of one or more pictures in a coded layer video sequence (CLVS) associated with the video content.
7 . The method according to claim 1 , wherein the first signal is a flag, and the method further comprises:
in response to the flag having a value equal to 1, determining that the APS NAL unit is not present in the received bitstream.
8 . A video encoding method, comprising:
encoding, into a bitstream associated with video content, a first signal indicating whether an adaptation parameter set (APS) network-abstraction-layer (NAL) unit is present in the bitstream; and
in response to the APS NAL unit being not present in the bitstream, disabling a chroma adaptive loop filter (ALF) process and encoding, into the bitstream, one or more slice-level flags indicating that the chroma ALF is disabled.
9 . The method according to claim 8 , wherein the one or more slice-level flags comprise:
a first slice-level flag corresponding to a chroma ALF process of a chroma component Cb, and a second slice-level flag corresponding to a chroma ALF process of a chroma component Cr.
10 . The method according to claim 8 , further comprising:
setting values of the one or more slice-level flags to be equal to 0 for all of one or more pictures in a coded layer video sequence (CLVS) associated with the video content.
11 . The method according to claim 8 , further comprising:
in response to the APS NAL unit being not present in the bitstream, performing a luma ALF process using a predetermined set of filters.
12 . The method according to claim 11 , wherein performing the luma ALF process using the predetermined set of filters further comprises:
encoding, into the bitstream, a third slice-level flag associated with the luma ALF process.
13 . The method according to claim 12 , further comprising:
setting a value of the third slice-level flag to be equal to 0 for all of one or more pictures in a coded layer video sequence (CLVS) associated with the video content.
14 . The method according to claim 8 , wherein the first signal is a flag, and the method further comprises:
in response to the APS NAL unit being not present in the bitstream, setting a value of the flag to be equal to 1.
15 . A method of storing a bitstream associated with video content, the method comprising:
generating the bitstream comprising:
a first signal indicating that adaptation parameter set (APS) network-abstraction-layer (NAL) unit is not present in the bitstream; and
one or more slice-level flags indicating that a chroma ALF process is disabled; and
storing the bitstream in a non-transitory computer readable medium.
16 . The method according to claim 15 , wherein the one or more slice-level flags comprise:
a first slice-level flag corresponding to a chroma ALF process of a chroma component Cb, and a second slice-level flag corresponding to a chroma ALF process of a chroma component Cr.
17 . The method according to claim 15 , further comprising:
setting values of the one or more slice-level flags to be equal to 0 for all of one or more pictures in a coded layer video sequence (CLVS) associated with the video content.
18 . The method according to claim 15 , further comprising:
performing a luma ALF process using a predetermined set of filters.
19 . The method according to claim 18 , wherein the generated bitstream further comprises a third slice-level flag associated with the luma ALF process.
20 . The method according to claim 19 , further comprising:
setting a value of the third slice-level flag to be equal to 0 for all of one or more pictures in a coded layer video sequence (CLVS) associated with the video content.