Audio-video multiplexing device

Abstract

The invention discloses an audio-video multiplexing device. The multiplexed video ES (Elementary Stream) and audio PES (Packetized Elementary Stream) both are obtained from an external memory, the video ES is generated by a video encoder in an encoding manner, and an audio PES packet is formed by an audio encoder in a manner of encoding and packaging; a CPU (Central Processing Unit) part packages the program specific information (PSI) and the program clock reference (PCR) into a TS (Transmission Stream) packet according to the syntax rules of the transmission stream (TS) in the standard, and simultaneously generates a video PES head and the configuration information needed for other multiplexer hardware accelerators; and the multiplexer hardware accelerator part selects to multiplex the TS packet and a padding packet into the transmission stream with constant output rate according to a multiplexing strategy, wherein the TS packet is formed by packaging of the PSI, the PCR and the audio-video PES. The invention provides an audio-video multiplexing device, which can process high-definition video in real time, and is high in flexibility, simple in hardware structure, small in delay, constant in multiplexing rate and small in PCR jitter.

Description

technical field [0001] The invention relates to the technical field of digital video coding and decoding, in particular to an audio and video multiplexing device. Background technique [0002] The digital audio and video industry is an important industry for national economic and social development, and one of the three major components of the information industry. [0003] The amount of digitized information is very large. In order to effectively improve the channel utilization, on the one hand, the information source is compressed and encoded so that it occupies the smallest bandwidth during transmission; on the other hand, how to send multiple sets of information in a single channel program, the resulting multiplexing technique is very practical. The research object of this paper is the multiplexing technology, which is different from the traditional time division multiplexing and frequency division multiplexing, it is a statistical multiplexing based on the dynamic allo...

AI Technical Summary

Problems solved by technology

[0004] figure 1 It is the block diagram of the audio and video coding multiplexing system in the prior art. At present, most of the multiplexers are implemented either by pure hardware or completely by software. Traditional hardware multiplexers are expensive, poor in portability, and not upgradable ; while the multiplexer implemented by software occupies a lot of system resources in order to meet the requirements of high-definition real-time output, and most of the multiplexing equipment adopts DSP real-time processing technology, which increases the cost of multiplexing

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