Re: [alsa-devel] Usb audio - unsuported sampling rates

On 10.07.2012 23:33, Daniel Mack wrote:

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.

Something like the patch below could help. Can you try this?

Daniel