Re: Usb audio - unsuported sampling rates

[Daniel Mack <zonque@gmail.com>]

[-- Attachment #1: Type: text/plain, Size: 1517 bytes --]

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

[-- Attachment #2: playstation-eye-samplerates.diff --]
[-- Type: text/x-patch, Size: 622 bytes --]

diff --git a/sound/usb/format.c b/sound/usb/format.c
index ddfef57..ce64a5b 100644
--- a/sound/usb/format.c
+++ b/sound/usb/format.c
@@ -158,6 +158,17 @@ static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audiof
 		return -1;
 	}
 
+	/* 
+	 * Sony's "Playstation Eye" microphone only reports one sample rate,
+	 * but can in fact handle more.
+	 */
+	if (chip->usb_id == USB_ID(0x1415, 0x2000) && fp->altsetting == 1) {
+		fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
+		fp->rate_min = 16000;
+		fp->rate_min = 48000;
+		return 0;
+	}
+
 	if (nr_rates) {
 		/*
 		 * build the rate table and bitmap flags

[-- Attachment #3: Type: text/plain, Size: 0 bytes --]