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dsound: Revised 5.1 to stereo downmix. 

Signed-off-by: Nikola Pavlica <pavlica.nikola@gmail.com>
Signed-off-by: Andrew Eikum <aeikum@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
stable
Nikola Pavlica 2019-04-23 20:04:22 +02:00 committed by Alexandre Julliard
parent f80059544b
commit 87eaa2f593
1 changed files with 11 additions and 13 deletions
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24
dlls/dsound/dsound_convert.c
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@ -216,39 +216,37 @@ void put_stereo2surround51(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD c
void put_surround512stereo(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
{
/* based on pulseaudio's downmix algorithm */
/* based on analyzing a recording of a dsound downmix */
switch(channel){
case 4: /* back left */
value *= 0.056f; /* (1/9) / (sum of left volumes) */
case 4: /* surround left */
value *= 0.24f;
dsb->put_aux(dsb, pos, 0, value);
break;
case 0: /* front left */
value *= 0.503f; /* 1 / (sum of left volumes) */
value *= 1.0f;
dsb->put_aux(dsb, pos, 0, value);
break;
case 5: /* back right */
value *= 0.056f; /* (1/9) / (sum of right volumes) */
case 5: /* surround right */
value *= 0.24f;
dsb->put_aux(dsb, pos, 1, value);
break;
case 1: /* front right */
value *= 0.503f; /* 1 / (sum of right volumes) */
value *= 1.0f;
dsb->put_aux(dsb, pos, 1, value);
break;
case 2: /* front centre */
value *= 0.252f; /* 0.5 / (sum of left/right volumes) */
case 2: /* centre */
value *= 0.7;
dsb->put_aux(dsb, pos, 0, value);
dsb->put_aux(dsb, pos, 1, value);
break;
case 3: /* LFE */
value *= 0.189f; /* 0.375 / (sum of left/right volumes) */
dsb->put_aux(dsb, pos, 0, value);
dsb->put_aux(dsb, pos, 1, value);
case 3:
/* LFE is totally ignored in dsound when downmixing to 2 channels */
break;
}
}