From: malc <av1474@comtv.ru>
To: "Marc-André Lureau" <marcandre.lureau@gmail.com>
Cc: "Marc-André Lureau" <marcandre.lureau@redhat.com>,
dnb@redhat.com, dlaor@redhat.com, qemu-devel@nongnu.org,
kraxel@redhat.com
Subject: Re: [Qemu-devel] [PATCH 03/11] audio: use a nominal volume of UINT_MAX
Date: Tue, 13 Mar 2012 01:42:45 +0400 (MSK) [thread overview]
Message-ID: <alpine.LNX.2.00.1203130141440.6207@linmac> (raw)
In-Reply-To: <CAJ+F1CLFi9_XGi+SV+cLEXLG2e-KAuK=dD7OG7yFR3MdNdJgDw@mail.gmail.com>
On Mon, 12 Mar 2012, Marc-Andr? Lureau wrote:
> On Mon, Mar 12, 2012 at 10:11 PM, malc <av1474@comtv.ru> wrote:
> >> AUD_set_volume_out (SWVoiceOut *sw, int mute, uint8_t lvol..)
> >>
> >> sw->vol.l = nominal_volume.l * lvol / 255;
> >>
> >> So the range was [0..2^8-1] and then it becomes [0..2^32], which looks
> >> wrong to me.
> >
> > It actually becomes [-2^63..2^63-1] nominal_volume.l being 64 bit signed
> > and all.
>
> uint8_t [0..255] / 255 * 2^32 = [0..2^32]
>
nominal_volume.[lr] is int64_t... i don't get where you take this ^32
from.
> >> And Spice uses [0..2^16-1]. So it is simpler to stay within the range
> >> of an integer..
> >
> > I do not get you, i really don't.
>
> The audio hw volume range is within a uint8 [0..2^8-1] that is then
> scaled into a [0..2^32], it would be easier to stay within a
> [0..2^n-1] range all the way.
>
>
>
--
mailto:av1474@comtv.ru
next prev parent reply other threads:[~2012-03-12 21:42 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-12 18:50 [Qemu-devel] [PATCH 00/11] apply volume on client side (v3) Marc-André Lureau
2012-03-12 18:50 ` [Qemu-devel] [PATCH 01/11] audio: add VOICE_VOLUME ctl Marc-André Lureau
2012-03-12 18:50 ` [Qemu-devel] [PATCH 02/11] audio: don't apply volume effect if backend has VOICE_VOLUME_CAP Marc-André Lureau
2012-03-12 18:50 ` [Qemu-devel] [PATCH 03/11] audio: use a nominal volume of UINT_MAX Marc-André Lureau
2012-03-12 20:03 ` malc
2012-03-12 20:25 ` Marc-André Lureau
2012-03-12 20:29 ` malc
2012-03-12 20:50 ` Marc-André Lureau
2012-03-12 21:00 ` malc
2012-03-12 21:07 ` Marc-André Lureau
2012-03-12 21:11 ` malc
2012-03-12 21:28 ` Marc-André Lureau
2012-03-12 21:42 ` malc [this message]
2012-03-12 21:46 ` Marc-André Lureau
2012-03-12 22:52 ` malc
2012-03-12 23:09 ` Marc-André Lureau
2012-03-12 18:50 ` [Qemu-devel] [PATCH 04/11] hw/ac97: remove USE_MIXER code Marc-André Lureau
2012-03-12 18:50 ` [Qemu-devel] [PATCH 05/11] hw/ac97: the volume mask is not only 0x1f Marc-André Lureau
2012-03-12 18:50 ` [Qemu-devel] [PATCH 06/11] hw/ac97: add support for volume control Marc-André Lureau
2012-03-12 19:42 ` malc
2012-03-12 18:50 ` [Qemu-devel] [PATCH 07/11] audio/spice: " Marc-André Lureau
2012-03-12 18:50 ` [Qemu-devel] [PATCH 08/11] Do not use pa_simple PulseAudio API Marc-André Lureau
2012-03-12 20:05 ` malc
2012-03-12 18:50 ` [Qemu-devel] [PATCH 09/11] configure: pa_simple is not needed anymore Marc-André Lureau
2012-03-12 18:50 ` [Qemu-devel] [PATCH 10/11] Allow controlling volume with PulseAudio backend Marc-André Lureau
2012-03-12 18:50 ` [Qemu-devel] [PATCH 11/11] Make mixemu mandatory Marc-André Lureau
2012-03-12 19:44 ` [Qemu-devel] [PATCH 00/11] apply volume on client side (v3) malc
2012-03-12 20:35 ` Marc-André Lureau
2012-03-12 20:51 ` malc
2012-03-12 20:59 ` Marc-André Lureau
2012-03-12 21:02 ` malc
2012-03-13 10:19 ` Gerd Hoffmann
2012-03-13 10:33 ` Kevin Wolf
2012-03-13 10:34 ` Gerd Hoffmann
2012-03-13 11:02 ` Marc-André Lureau
2012-03-13 12:09 ` malc
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