Nikola Pavlica : dsound: Added 7.1 to stereo downmix.
Alexandre Julliard
julliard at winehq.org
Thu Apr 25 16:39:26 CDT 2019
Module: wine
Branch: master
Commit: fc84b8675a848683988d1793ea4bc9f95b7ea395
URL: https://source.winehq.org/git/wine.git/?a=commit;h=fc84b8675a848683988d1793ea4bc9f95b7ea395
Author: Nikola Pavlica <pavlica.nikola at gmail.com>
Date: Tue Apr 23 20:04:23 2019 +0200
dsound: Added 7.1 to stereo downmix.
Signed-off-by: Nikola Pavlica <pavlica.nikola at gmail.com>
Signed-off-by: Andrew Eikum <aeikum at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
---
dlls/dsound/dsound_convert.c | 47 ++++++++++++++++++++++++++++++++++++++++++++
dlls/dsound/dsound_private.h | 1 +
dlls/dsound/mixer.c | 6 ++++++
3 files changed, 54 insertions(+)
diff --git a/dlls/dsound/dsound_convert.c b/dlls/dsound/dsound_convert.c
index 6171b16..3519337 100644
--- a/dlls/dsound/dsound_convert.c
+++ b/dlls/dsound/dsound_convert.c
@@ -251,6 +251,53 @@ void put_surround512stereo(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD c
}
}
+void put_surround712stereo(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
+{
+ /* based on analyzing a recording of a dsound downmix */
+ switch(channel){
+
+ case 6: /* back left */
+ value *= 0.24f;
+ dsb->put_aux(dsb, pos, 0, value);
+ break;
+
+ case 4: /* surround left */
+ value *= 0.24f;
+ dsb->put_aux(dsb, pos, 0, value);
+ break;
+
+ case 0: /* front left */
+ value *= 1.0f;
+ dsb->put_aux(dsb, pos, 0, value);
+ break;
+
+ case 7: /* back right */
+ value *= 0.24f;
+ dsb->put_aux(dsb, pos, 1, value);
+ break;
+
+ case 5: /* surround right */
+ value *= 0.24f;
+ dsb->put_aux(dsb, pos, 1, value);
+ break;
+
+ case 1: /* front right */
+ value *= 1.0f;
+ dsb->put_aux(dsb, pos, 1, value);
+ break;
+
+ case 2: /* centre */
+ value *= 0.7;
+ dsb->put_aux(dsb, pos, 0, value);
+ dsb->put_aux(dsb, pos, 1, value);
+ break;
+
+ case 3:
+ /* LFE is totally ignored in dsound when downmixing to 2 channels */
+ break;
+ }
+}
+
void put_quad2stereo(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
{
/* based on pulseaudio's downmix algorithm */
diff --git a/dlls/dsound/dsound_private.h b/dlls/dsound/dsound_private.h
index 45a100e..b04ce06 100644
--- a/dlls/dsound/dsound_private.h
+++ b/dlls/dsound/dsound_private.h
@@ -179,6 +179,7 @@ void put_stereo2quad(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel
void put_mono2surround51(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value) DECLSPEC_HIDDEN;
void put_stereo2surround51(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value) DECLSPEC_HIDDEN;
void put_surround512stereo(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value) DECLSPEC_HIDDEN;
+void put_surround712stereo(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value) DECLSPEC_HIDDEN;
void put_quad2stereo(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value) DECLSPEC_HIDDEN;
HRESULT secondarybuffer_create(DirectSoundDevice *device, const DSBUFFERDESC *dsbd,
diff --git a/dlls/dsound/mixer.c b/dlls/dsound/mixer.c
index 32bde38..05ca99b 100644
--- a/dlls/dsound/mixer.c
+++ b/dlls/dsound/mixer.c
@@ -179,6 +179,12 @@ void DSOUND_RecalcFormat(IDirectSoundBufferImpl *dsb)
dsb->put = put_surround512stereo;
dsb->put_aux = putieee32_sum;
}
+ else if (ichannels == 8 && ochannels == 2)
+ {
+ dsb->mix_channels = 8;
+ dsb->put = put_surround712stereo;
+ dsb->put_aux = putieee32_sum;
+ }
else if (ichannels == 4 && ochannels == 2)
{
dsb->mix_channels = 4;
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