UAC麦克见音频数据格式FORMAT_TYPE_I

#define DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(n)\ struct uac_format_type_i_discrete_descriptor_## n {\
    __u8 bLength;\
    __u8 bDescriptorType;\
    __u8 bDescriptorSubtype;\
    __u8 bFormatType;\
    __u8 bNrChannels;\
    __u8 bSubframeSize;\
    __u8 bBitResolution;\
    __u8 bSamFreqType;\
    __u8 tSamFreq[n][3];\
}
__attribute__((packed))
static struct uac_format_type_i_discrete_descriptor_1 microphone_as_type_i_desc = {.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
    .bDescriptorType = USB_DT_CS_INTERFACE,
    .bDescriptorSubtype = UAC_FORMAT_TYPE,
    .bFormatType = UAC_FORMAT_TYPE_I,
    .bNrChannels = 1,
    .bSubframeSize = 2,
    .bBitResolution = 16,
    .bSamFreqType = 1,
};

UAC麦克见音频数数据格式FORMAT_TYPE_I各字段的描述详见：http://www.usbzh.com/article/detail-184.html

模拟设备信息（Free Device Monitoring Studio 抓取

• descriptors[8] = “Class-Specific Interface Descriptor”
• bLength = 11
• bDescriptorType = CS_INTERFACE (36)
• bDescriptorSubtype = 2
• as_interface =
• bFormatType = 1
• bNrChannels = 1
• bSubslotSize = 2
• bBitResolution = 16
• bSampleFreqType = 1
• sample_freq = “16000 Hz”
• aSampleFreq = 128, 62, 0