[alsa-devel] Usb audio - unsuported sampling rates

[Daniel Mack]

Hi Gordon,

On 10.07.2012 20:57, Gordon Dilan wrote:
           0
>     Interface Descriptor:
>       bLength                 9
>       bDescriptorType         4
>       bInterfaceNumber        2
>       bAlternateSetting       1
>       bNumEndpoints           1
>       bInterfaceClass         1 Audio
>       bInterfaceSubClass      2 Streaming
>       bInterfaceProtocol      0
>       iInterface              0
>       AudioStreaming Interface Descriptor:
>         bLength                 7
>         bDescriptorType        36
>         bDescriptorSubtype      1 (AS_GENERAL)
>         bTerminalLink           2
>         bDelay                  1 frames
>         wFormatTag              1 PCM
>       AudioStreaming Interface Descriptor:
>         bLength                11
>         bDescriptorType        36
>         bDescriptorSubtype      2 (FORMAT_TYPE)
>         bFormatType             1 (FORMAT_TYPE_I)
>         bNrChannels             4
>         bSubframeSize           2
>         bBitResolution         16
>         bSamFreqType            1 Discrete
>         tSamFreq[ 0]        16000

The interface only reports this single sample rate. If the vendor claims
that there are in fact more, it would be good to know which ones.

Then we can add a quirk to parse_audio_format_rates_v1() in
sound/usb/format.c - that shouldn't be too hard.


Daniel