Clemens Ladisch wrote:
> > * Is my use of snd_pcm_set_params() missing something and if so what?
>
> No. But it does not set exactly the same parameters as the manual
> hw_params calls.
>
> Please check for differences with snd_pcm_hw_params_dump()
That showed some differences. The params when its working:
ACCESS: RW_INTERLEAVED
FORMAT: S32_LE
SUBFORMAT: STD
SAMPLE_BITS: 32
FRAME_BITS: 64
CHANNELS: 2
RATE: 44100
PERIOD_TIME: (5011 5012)
PERIOD_SIZE: 221
PERIOD_BYTES: 1768
PERIODS: (593 594)
BUFFER_TIME: (2972154 2972155)
BUFFER_SIZE: 131072
BUFFER_BYTES: 1048576
TICK_TIME: 0
and the one that doesn't:
ACCESS: MMAP_INTERLEAVED RW_INTERLEAVED
FORMAT: S32_LE
SUBFORMAT: STD
SAMPLE_BITS: 32
FRAME_BITS: 64
CHANNELS: 2
RATE: [44100 96000]
PERIOD_TIME: [125 1486078)
PERIOD_SIZE: [8 65536]
PERIOD_BYTES: [64 524288]
PERIODS: [2 1024]
BUFFER_TIME: (166 2972155)
BUFFER_SIZE: [16 131072]
BUFFER_BYTES: [128 1048576]
TICK_TIME: ALL
which seems rather odd!
> Which driver?
snd_usb_audio
> Any messages in the system log?
Just the connect message when the device is plugged in:
usb 1-1: new high-speed USB device number 43 using xhci_hcd
usb 1-1: New USB device found, idVendor=1235, idProduct=8016
usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-1: Product: Scarlett 2i2 USB
usb 1-1: Manufacturer: Focusrite
> If less than the full number of frames have been read, you get a return
> value that is not an error code but a positive number.
Its definitely an error message. I changed the code to:
if ((err = snd_pcm_readi (capture_handle, buffer, buffer_frames)) < 0) {
printf ("Read from audio interface failed (%d, %s)\n", err, snd_strerror (err));
break;
}
and that results in:
Read from audio interface failed (-5, Input/output error)
Cheers,
Erik
--
----------------------------------------------------------------------
Erik de Castro Lopo
http://www.mega-nerd.com/
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