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alsaloop: Support "Playback Pitch 1000000" rate shift

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Linux 5.15 will introduce a new control element "Playback Pitch 1000000"
(commit 6fec018 ("usb: gadget: u_audio.c: Adding Playback Pitch ctl for
sync playback") which provides feedback mechanism for playback direction
of USB Audio Gadget. The control operates in the same way as the
existing control element "Capture Pitch 1000000".

This patch adds support for this feature.

Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Pavel Hofman 2021-10-24 10:31:55 +02:00 committed by Jaroslav Kysela
parent 59464effec
commit 3b1b6863e7
1 changed files with 6 additions and 2 deletions
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8
alsaloop/pcmjob.c
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@ -1064,6 +1064,7 @@ static int set_rate_shift(struct loopback_handle *lhandle, double pitch)
snd_ctl_elem_value_set_integer(lhandle->ctl_rate_shift, 0, pitch * 100000);
err = snd_ctl_elem_write(lhandle->ctl, lhandle->ctl_rate_shift);
} else if (lhandle->ctl_pitch) {
// 'Playback/Capture Pitch 1000000' requires reciprocal to pitch
snd_ctl_elem_value_set_integer(lhandle->ctl_pitch, 0, (1 / pitch) * 1000000);
err = snd_ctl_elem_write(lhandle->ctl, lhandle->ctl_pitch);
} else {
@ -1241,7 +1242,10 @@ static int openctl(struct loopback_handle *lhandle, int device, int subdevice)
lhandle->prateshift_name);
exit(EXIT_FAILURE);
}
}
} else
openctl_elem(lhandle, device, subdevice, "Playback Pitch 1000000",
&lhandle->ctl_pitch);
set_rate_shift(lhandle, 1);
if (lhandle->loopback->controls)
goto __events;
return 0;
@ -1388,7 +1392,7 @@ int pcmjob_init(struct loopback *loop)
loop->id = strdup(id);
if (loop->sync == SYNC_TYPE_AUTO && (loop->capt->ctl_rate_shift || loop->capt->ctl_pitch))
loop->sync = SYNC_TYPE_CAPTRATESHIFT;
if (loop->sync == SYNC_TYPE_AUTO && loop->play->ctl_rate_shift)
if (loop->sync == SYNC_TYPE_AUTO && (loop->play->ctl_rate_shift || loop->play->ctl_pitch))
loop->sync = SYNC_TYPE_PLAYRATESHIFT;
#ifdef USE_SAMPLERATE
if (loop->sync == SYNC_TYPE_AUTO && loop->src_enable)