2个字节。
下面蓝色的为AudioSpecificConfig部分:
000001e0h: 00 00 00 00 00 AF 0011 90 00 00 00 0F 09 00 02; .....?.?......
根据AudioSpecificConfig结构的定义:
- audioObjectType = (0x11 & 0xF8) >> 3 <- 取前5bit,结果为2
- samplingFrequencyIndex = ((0x11 & 0x7) << 1) | (0x90 >> 7)<- 取后4bit,结果为3
- channelConfiguration = (0x90 >> 3) & 0x0F <- 取后4bit,结果为2
- frameLengthFlag = (0x90 >> 2) & 0x01<- 取后1bit,结果为0
- dependsOnCoreCoder = (0x90 >> 1) & 0x01 <- 取后1bit,结果为0
- extensionFlag = 0x90 & 0x01 <- 最后1bit,结果始终为0
参考:
AudioSpecificConfig部分参数含义见: