Thanx,
that make it clear.
>> [hw_rules to make min channels max channels]
>>
>>Why ? Is there a reason to let channels min not to be 1 ?
>
>ALSA kernel drivers mirror hardware capabilities. its not possible to
>configure the hardware to use just 1 channel. user space (alsa-lib)
>allows use of other numbers of channels.
>
Ok, on the rme9652 this is definitive true, I agree.
Since I can enable DMA individual on the HDSP-MADI card as a new
function, I can say hardware supports the use of less channels and so
so I will set min channels to 1.
Even I saw in the hdsp.c driver,
static inline int snd_hdsp_enable_io (hdsp_t *hdsp);
...
for (i = 0; i < HDSP_MAX_CHANNELS; ++i) {
hdsp_write (hdsp, HDSP_inputEnable + (4 * i), 1);
hdsp_write (hdsp, HDSP_outputEnable + (4 * i), 1);
}
...
which I think, but I am not sure about, can turn DMA-channels for each
channel on and off, so the card can be used with lesser channels (and
DMA-.., PCI-Load) for better performance.
But I think, this isnt a big problem not to use this. On 64channels
with DMA in/out it make sense to scale Bus-usage, since setting the
matrix mixer you can play all outputs with lesser channels, even with
one.
>
>>C) Rule set rate according to channels:
> [ ... ]
>>Why is it not allowed to use single speed wenn less channels than double speed
>>can handle are needed ?
>
>same reason.
>
Rule C) Here is a little different question:
if (c->min >= hdsp->ss_channels) {
snd_interval_t t = {
.min = 32000,
.max = 48000,
.integer = 1,
};
return snd_interval_refine(r, &t);
} else if (c->max <= hdsp->ds_channels) {
snd_interval_t t = {
.min = 64000,
.max = 96000,
.integer = 1,
};
return snd_interval_refine(r, &t);
}
should be if (c->min >= hdsp->ds_channels) since ds_channels are lower
count than ss_channels and then single speed should be used if more
channels are requested than ds_channels, that
would make sense.
and second part if (c->max <= hdsp->ds_channels)
i dont know why to force to double speed ?
mfg winfried
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