A quick audio and video edge information decoding method
A decoding method and side information technology, which are applied in the field of fast decoding of audio and video side information, can solve the problems of increasing decoding cost, spending a lot of time, and reducing decoding efficiency, and achieve the effects of reducing decoding cost, reducing times, and improving decoding efficiency.
Inactive Publication Date: 2008-05-28
CENT ACADEME OF SVA GROUP
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Since the variables of the function need to be pushed into the stack of the processor every time the function is called, it will take a lot of time to peel off one by one, resulting in a decrease in decoding efficiency and an increase in the cost of decoding.
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[0015] The fast audio-video side information decoding method of the present invention will be further described in detail below.
[0016] The present invention is used to decode the side information in the audio and video bit stream. Taking the AVS video decoding sequence header Sequenceheader as an example, it includes in sequence according to the order of the side information in the bit stream: profile_id, which occupies 8 bits of the bit stream; level level_id, Occupies 8-bit bit stream; progressive scan progressive_sequence, occupies 1-bit bit stream; image horizontal size horizontal_size, occupies 14-bit bit stream; image height dimension vertical_size, occupies 14-bit bit stream; chroma format chroma_format, occupies 2-bit bit stream; Sample precision sample_precision, occupying 3 bits of bit stream; aspect ratio aspect_ratio_information, occupying 4 bits of bit stream; frame rate frame_rate_code, occupying 4 bits; basic bit rate bit_rate_lower, occupying 18 bits; flag bi...
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The invention provides a fast audio / video information decoding method, which comprises the following steps: according to the characteristic that the occupied bit numbers of side information in the audio / video information coding standard are approximately constant in a bit stream, when the side information is decoded, the side information is divided into m groups of G1 to Gm, and the occupied total bit numbers of each group of side information are L1 to Lm; Lj bit side information is read from the bit stream through a bit stream stripping function, a value returned by the stripping function is endowed to a variable var; and then the bit operation is adopted to obtain the value of each side information in the jth group of side information; the value of j and n is judged, the stripping of the side information from the bit stream is realized circularly, thereby the decoding efficiency of the side information is higher than the method that the side information is stripped on by one in the prior art, and the cost is lower.
Description
technical field [0001] The invention belongs to the field of audio and video decoding, in particular to a fast decoding method for audio and video side information. Background technique [0002] Existing audio and video codec standards, such as Moving Picture Experts Group (MPEG, Moving Picture Expert Groups) standards, China's advanced audio and video standards (AVS, Audio and Video coding Standard) and digital audio (DRA, Digital Radio Audio) coding standards, they The data in the bit stream obtained by encoding the audio and video signals can be divided into main data and side information. Since the number of bits occupied by the side information in the bit stream is roughly constant, in the decoding process, according to the number of bits required by different side information, the side information of the corresponding number of bits can be directly stripped from the bit stream. Existing audio and video decoding methods all adopt the method of extracting side informati...
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IPC IPC(8): H04N7/52
Inventor 谭建国
Owner CENT ACADEME OF SVA GROUP