Re: [Alsa-user] USB audio device - Error: parse_audio_format_rates_v2(): unable to retrieve number of sample rates

[Daniel M. <zo...@gm...>]

On 15.04.2012 21:37, Daniel Mack wrote:
> On 04/14/2012 10:18 PM, je...@we... wrote:
>> Want to give a short feedback for other user waiting for a solution.
>>
>> Thanks to Daniel the problem is solved now by the following patch:
> 
> Yes, but Joachim wanted to contact the vendor and ask for a firmware
> upgrade to fix this on the device side. Only if they refuse to provide a
> fix for that, we can merge this hack.

Joachim, any feedback from the vendor?



>> diff --git a/sound/usb/clock.c b/sound/usb/clock.c
>> index 379baad..b05111d 100644
>> --- a/sound/usb/clock.c
>> +++ b/sound/usb/clock.c
>> @@ -255,6 +255,13 @@ static int set_sample_rate_v2(struct snd_usb_audio
>> *chip, int iface,
>>      int err, crate;
>>      int clock = snd_usb_clock_find_source(chip, fmt->clock);
>>  +    /*
>> +     * Fractal Audio Systems AXE-FX II does not respond to sample rate
>> +     * set requests. The only valid rate is 48000.
>> +     */
>> +    if (chip->usb_id == USB_ID(0x2466, 0x8003) && rate == 48000)
>> +        return 0;
>> +
>>      if (clock < 0)
>>          return clock;
>>  diff --git a/sound/usb/format.c b/sound/usb/format.c
>> index ddfef57..7a9e82a 100644
>> --- a/sound/usb/format.c
>> +++ b/sound/usb/format.c
>> @@ -279,6 +279,20 @@ static int parse_audio_format_rates_v2(struct
>> snd_usb_audio *chip,
>>      int nr_triplets, data_size, ret = 0;
>>      int clock = snd_usb_clock_find_source(chip, fp->clock);
>>  +    /*
>> +     * Fractal Audio Systems AXE-FX II does not respond to sample rate
>> +     * query requests. The only valid rate is 48000.
>> +     */
>> +    if (chip->usb_id == USB_ID(0x2466, 0x8003)) {
>> +        fp->nr_rates = 1;
>> +        fp->rate_min = 48000;
>> +        fp->rate_max = 48000;
>> +        fp->rates = SNDRV_PCM_RATE_48000;
>> +        fp->rate_table = kmalloc(sizeof(int), GFP_KERNEL);
>> +        fp->rate_table[0] = 48000;
>> +        return 0;
>> +    }
>> +
>>      if (clock < 0) {
>>          snd_printk(KERN_ERR "%s(): unable to find clock source (clock
>> %d)\n",
>>                  __func__, clock);
>>
>> In addition to the previously posted patch it was necessary to modify
>> clock.c also, because the Axe-FX II currently neither responds to get
>> sample rate requests nor set sample rate requests.
>>
>> Many thanks again to Daniel.
>>
>> Best regards
>>
>> Joachim
>>
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>