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Code Issues Releases Activity

When present use ogain instead of master for surround sound channels.

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The latter has lead to reports of broken audio.

Do not swap ogain and master when headphones detected.
This commit is contained in:
Orion Hodson 2003-08-23 21:39:51 +00:00
parent aec5c3d0cc
commit cfd5696d22
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=119375
1 changed files with 14 additions and 14 deletions
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28
sys/dev/sound/pcm/ac97.c
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@ -443,16 +443,16 @@ ac97_setmixer(struct ac97_info *codec, unsigned channel, unsigned left, unsigned
static void
ac97_fix_auxout(struct ac97_info *codec)
{
int keep_ogain;
/*
* Determine if AUX_OUT is a valid control.
* By default, The ac97 aux_out register (0x04) corresponds to OSS's
* OGAIN setting.
*
* Control will read zero if not valid after a reset, other gain
* controls read muted (0x8000).
* We first check whether aux_out is a valid register. If not
* we may not want to keep ogain.
*/
if (ac97_rdcd(codec, AC97_MIX_AUXOUT) == 0) {
bzero(&codec->mix[SOUND_MIXER_OGAIN],
sizeof(codec->mix[SOUND_MIXER_OGAIN]));
}
keep_ogain = ac97_rdcd(codec, AC97_MIX_AUXOUT) & 0x8000;
/*
* Determine what AUX_OUT really means, it can be:
@ -465,13 +465,13 @@ ac97_fix_auxout(struct ac97_info *codec)
*/
if (codec->extcaps & AC97_EXTCAP_SDAC &&
ac97_rdcd(codec, AC97_MIXEXT_SURROUND) == 0x8080) {
codec->mix[SOUND_MIXER_VOLUME].reg = AC97_MIXEXT_SURROUND;
} else if (codec->caps & AC97_CAP_HEADPHONE) {
/* Headphone out present/selected AUX_OUT is effectively
* master volume control. */
struct ac97mixtable_entry tmp = codec->mix[SOUND_MIXER_VOLUME];
codec->mix[SOUND_MIXER_VOLUME] = codec->mix[SOUND_MIXER_OGAIN];
codec->mix[SOUND_MIXER_OGAIN] = tmp;
codec->mix[SOUND_MIXER_OGAIN].reg = AC97_MIXEXT_SURROUND;
keep_ogain = 1;
}
if (keep_ogain == 0) {
bzero(&codec->mix[SOUND_MIXER_OGAIN],
sizeof(codec->mix[SOUND_MIXER_OGAIN]));
}
}