Andrew Eikum : dsound: Support downmixing 5.1 to stereo.
Alexandre Julliard
julliard at wine.codeweavers.com
Thu May 19 10:32:07 CDT 2016
Module: wine
Branch: master
Commit: 88dd3b4f6e4ed10413b8d93055801a6e60fbc5e8
URL: http://source.winehq.org/git/wine.git/?a=commit;h=88dd3b4f6e4ed10413b8d93055801a6e60fbc5e8
Author: Andrew Eikum <aeikum at codeweavers.com>
Date: Thu May 19 09:11:13 2016 -0500
dsound: Support downmixing 5.1 to stereo.
Signed-off-by: Andrew Eikum <aeikum at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
---
dlls/dsound/dsound_convert.c | 46 ++++++++++++++++++++++++++++++++++++++++++++
dlls/dsound/dsound_private.h | 2 ++
dlls/dsound/mixer.c | 8 ++++++++
3 files changed, 56 insertions(+)
diff --git a/dlls/dsound/dsound_convert.c b/dlls/dsound/dsound_convert.c
index 4ae83ba..3b4d2e5 100644
--- a/dlls/dsound/dsound_convert.c
+++ b/dlls/dsound/dsound_convert.c
@@ -157,6 +157,13 @@ void putieee32(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, floa
*fbuf = value;
}
+void putieee32_sum(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
+{
+ BYTE *buf = (BYTE *)dsb->device->tmp_buffer;
+ float *fbuf = (float*)(buf + pos + sizeof(float) * channel);
+ *fbuf += value;
+}
+
void put_mono2stereo(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
{
dsb->put_aux(dsb, pos, 0, value);
@@ -206,6 +213,45 @@ 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 */
+ switch(channel){
+
+ case 4: /* back left */
+ value *= 0.056f; /* (1/9) / (sum of left volumes) */
+ dsb->put_aux(dsb, pos, 0, value);
+ break;
+
+ case 0: /* front left */
+ value *= 0.503; /* 1 / (sum of left volumes) */
+ dsb->put_aux(dsb, pos, 0, value);
+ break;
+
+ case 5: /* back right */
+ value *= 0.056f; /* (1/9) / (sum of right volumes) */
+ dsb->put_aux(dsb, pos, 1, value);
+ break;
+
+ case 1: /* front right */
+ value *= 0.503f; /* 1 / (sum of right volumes) */
+ dsb->put_aux(dsb, pos, 1, value);
+ break;
+
+ case 2: /* front centre */
+ value *= 0.252f; /* 0.5 / (sum of left/right volumes) */
+ 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);
+ break;
+ }
+}
+
void mixieee32(float *src, float *dst, unsigned samples)
{
TRACE("%p - %p %d\n", src, dst, samples);
diff --git a/dlls/dsound/dsound_private.h b/dlls/dsound/dsound_private.h
index d063046..49e98ba 100644
--- a/dlls/dsound/dsound_private.h
+++ b/dlls/dsound/dsound_private.h
@@ -47,6 +47,7 @@ typedef float (*bitsgetfunc)(const IDirectSoundBufferImpl *, DWORD, DWORD);
typedef void (*bitsputfunc)(const IDirectSoundBufferImpl *, DWORD, DWORD, float);
extern const bitsgetfunc getbpp[5] DECLSPEC_HIDDEN;
void putieee32(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value) DECLSPEC_HIDDEN;
+void putieee32_sum(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value) DECLSPEC_HIDDEN;
void mixieee32(float *src, float *dst, unsigned samples) DECLSPEC_HIDDEN;
typedef void (*normfunc)(const void *, void *, unsigned);
extern const normfunc normfunctions[4] DECLSPEC_HIDDEN;
@@ -177,6 +178,7 @@ void put_mono2quad(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel,
void put_stereo2quad(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value) DECLSPEC_HIDDEN;
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;
HRESULT secondarybuffer_create(DirectSoundDevice *device, const DSBUFFERDESC *dsbd,
IDirectSoundBuffer **buffer) DECLSPEC_HIDDEN;
diff --git a/dlls/dsound/mixer.c b/dlls/dsound/mixer.c
index 217d4ce..4f05ee2 100644
--- a/dlls/dsound/mixer.c
+++ b/dlls/dsound/mixer.c
@@ -173,6 +173,12 @@ void DSOUND_RecalcFormat(IDirectSoundBufferImpl *dsb)
dsb->mix_channels = 2;
dsb->put = put_stereo2surround51;
}
+ else if (ichannels == 6 && ochannels == 2)
+ {
+ dsb->mix_channels = 6;
+ dsb->put = put_surround512stereo;
+ dsb->put_aux = putieee32_sum;
+ }
else
{
if (ichannels > 2)
@@ -495,6 +501,8 @@ static DWORD DSOUND_MixInBuffer(IDirectSoundBufferImpl *dsb, float *mix_buffer,
/* Resample buffer to temporary buffer specifically allocated for this purpose, if needed */
oldpos = dsb->sec_mixpos;
+ if(dsb->put_aux == putieee32_sum)
+ memset(dsb->device->tmp_buffer, 0, dsb->device->tmp_buffer_len);
DSOUND_MixToTemporary(dsb, frames);
ibuf = dsb->device->tmp_buffer;
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