Thanks for your email!
On Fri, Jul 17, 2020 at 4:20 PM Tanu Kaskinen <tanuk@xxxxxx> wrote:
On Fri, 2020-07-17 at 10:57 +0800, Aaron Chou wrote:
> Hi, all:
>
> I am the newer about PulseAudio.
> When I have some time to learn it, I found that there are two ways in
> volume control, which is software control and hardware control.
> I can not understand these two ways.
> The software way means the volume data will not be sent to the hardware?
> It is unbelievable.
Software volume means that PulseAudio modifies the signal to be softer
or louder. Hardware volume means that PulseAudio sends the signal
unmodified and tells the hardware to the modification, which requires
that the hardware provides an interface for controlling the volume (I'm
currently using a USB sound card that doesn't provide such interface).
em...
I also have an appearance with a USB sound card, and something else is abnormal.
Such as the volume is set to 0, but it also can play music when the system reboot or power off.
So I doubt that the volume is not be set to hardware through PulseAudio.
Can I have the following flow chart： app->pulseaudio(software control)->alsa lib->alsa driver BTW: Do you know how the USB sound driver receives the volume data from PulseAudio? The ioctl? or other else? I can not determine. Regards. Aaron. |
--
Tanu
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