A little supplement to the audio packets in rtmp or FLV protocols

If we want to encapsulate Speex encoding into rtmp or FLV, we may encounter problems with how to populate Audiotagheader, Speex encoding supports 8k,16k,32k sample rate, but only 16k in rtmp or FLV protocol, At this point the sampling rate needs to be treated as 11.025k, that is, the packet of this byte is 0xb6

For the AAC encoding in RTMP or FLV packets, AAC sampling rate may be 48k, this time to be as a 44.1k packet, its audiotagheader the first byte of 0xAF

The support for AAC and Speex in Flash Player is 9,0,115,0 and 10, respectively.