Real-time container conversion realization method and device of LATM (low-overhead Moving Picture Experts Group-4 audio trans-port multiplex) AAC (advanced audio coding) audio stream.

Abstract

The invention belongs to the field of audio conversion and discloses a real-time container conversion realization method and a device of an LATM (low-overhead Moving Picture Experts Group-4 audio trans-port multiplex) AAC (advanced audio coding) audio stream. The method comprises the following steps of: step 1, receiving and processing an audio data stream and reading audio frame data, step 2, judging the head of the audio frame data is of an LATM AAC data format and going to step 3 if so, directly going to step 5 if not, step 3, analyzing the audio frame data and acquiring a core parameter and audio load data of an LATM AAC audio frame, step 4, forming an ADTS (audio data transport stream) AAC audio frame, and step 5, outputting the audio frame. The method and the device effectively achieves judgment of an LATM AAC audio in a transport code stream, container resolution and container conversion processing to ADTS AAC; an audio decoding library can support the LATM AAC audio stream well; and the system integration cost is lowered.

Description

technical field [0001] The invention belongs to the field of audio conversion, and in particular relates to a method and device for realizing real-time conversion of LATM AAC audio streams. Background technique [0002] With the popularity of high-definition programs, HEVC and AAC (Advanced Audio Coding, Advanced Audio Coding) formats for audio and video content in MPEG2-TS (transport stream for audio, video, and data) real-time transport streams have become popular. AAC is an audio compression coding algorithm with a high compression ratio. The AAC audio compression coding standard is currently the most widely used low-bit-rate audio coding standard. The rate is lower, which effectively saves the transmission bandwidth. In the applications of mobile multimedia broadcasting, Internet streaming media, IPTV and other fields, the audio coding technology of AAC has been adopted more and more. [0003] The audio part uses AAC to obtain excellent sound quality and multi-channel ...

AI Technical Summary

Problems solved by technology

[0006] When a general audio and video player processes the LATM AAC audio frame sequence in the real-time MPEG2-TS stream, it is based on the audio decoding library / framework that can natively support it. For example, the MacOs AudioQueue framework can only support audio frames in the ADTS AAC encapsulation format. If you need to be able to decode, you can only use a third-party decoding library to achieve it, which makes the implementation of the project complicated and may even incur additional costs

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