Got mails continuously from everywhere throwing question to me about AAC audio in H.323. So I arranged this post to example my previous posts: http://rg4.net/archives/1480.html, http://rg4.net/archives/1126.html, http://rg4.net/archives/1112.html The pcap file for this example can be downloaded here: HUAWEI_TE600-vs-ZTE_T800.pcapnp Here it is. 1. Basic knowledge: AAC LD descriptions in 14496-3 It operates at up […]
AAC
9 视频会议中，通常音频能力的比较是比较简单的，通常是只是比较一下格式就行了。但是aac系列音频就是一个例外。它有一个复杂的能力表示方式，在交互的时候也不会明确的指明确切的采样率，通道数，而是像264格式一样，给出的是能力的level上限，需要我们去匹配比较。这里简单的介绍一下aac能力，和工作中碰到的问题的总结。
AAC音频能力协商问题
5 This is a guide for analysis H.245 terminalCapabilitySet and figure out does the terminal supports AAC LC or AAC LD? First capture the call and it's communication packages, KDV1000-HUAWEI.pcap. Open KDV1000-HUAWEI.pcap with wireshark. Filter the KDV1000-HUAWEI.pcap with H225||H245 Locate & expand the terminalCapabilitySet Find the items from capabilityTable which capabilityIdentifier […]
Does your H323 terminal support AAC LC or AAC LD?
After all audio processing module has been full supported, I migrated the webrtc version to the latest version(update date: 5/9, 2013, svn code: 3988), I got a new assignment today, that is implement mp4 file container for the SDK. During the discussion of the assignment, I offered my suggestion for […]