This standard specifies the decoding process of digital video and audio compression coding for public security video surveillance applications.
This standard is applicable to real-time compression, transmission, playback, storage, etc. of video and audio in the field of public security, and it may also be referred to for other fields that require video and audio coding.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
rfc 3548 The Base16, Base32, and Base64 Data Encodings
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
NAL unit
a syntax structure that contains type indication of subsequent data and number of bytes it contains, with data in the form of RBSP, also including scattered emulation prevention bytes as necessary
3.1.2
NAL unit stream
a sequence of NAL units
3.1.3
reserved
specific values for certain syntax elements
Note: The values are provided for future use by the SVAC working group of China. Bitstreams conforming to this standard shall not use these values, but they may be used in the future extensions of this standard.
3.1.4
closed-loop pitch search
an estimation of pitch delay from weighted input signal and LTP filter status, also known as adaptive codebook search
3.1.5
bitstream
a sequence of bits consisting of coded video and audio and associated data, which can be used to represent both a NAL unit stream and a byte stream
3.1.6
transform coefficient
a scalar in frequency domain, which is associated with a particular one- or two-dimensional frequency index in the inverse transform part of the decoding process
3.1.7
transform coefficient level
an integer value associated with a particular two-dimensional frequency index in the decoding process for calculation of a transform coefficient
3.1.8
encoding process
a process that produces a bitstream conforming to this standard; video coding process is not stipulated in this standard
3.1.9
encoder
an embodiment of an encoding process, including software and hardware
GB/T 25724-2017 The following standards are cited：
