First post, by ezzetabi2
Rank
Newbie
I had an attack of nostalgia and I wanted to play the old Delphine game `Fade to Black' when I noticed the stereo output channels were swapped.
So I made a small patch to the .74 mixer code so now it can swap the audio output channels.
Maybe anyone is interested, so it is here.
Sorry for the second registration, but I forgot the email I used to the first one...
I put it inline so also guests can eventually download it.
diff -ru dosbox-0.74.bak/src/dosbox.cpp dosbox-0.74/src/dosbox.cpp--- dosbox-0.74.bak/src/dosbox.cpp 2010-09-01 21:20:45.000000000 +0200+++ dosbox-0.74/src/dosbox.cpp 2010-09-01 21:31:33.000000000 +0200@@ -448,6 +448,9 @@Pbool = secprop->Add_bool("nosound",Property::Changeable::OnlyAtStart,false);Pbool->Set_help("Enable silent mode, sound is still emulated though.");+ Pbool = secprop->Add_bool("swapstereo",Property::Changeable::OnlyAtStart,false);+ Pbool->Set_help("Swaps the left and right stereo channels.");+Pint = secprop->Add_int("rate",Property::Changeable::OnlyAtStart,44100);Pint->Set_values(rates);Pint->Set_help("Mixer sample rate, setting any device's rate higher than this will probably lower their sound quality.");diff -ru dosbox-0.74.bak/src/hardware/mixer.cpp dosbox-0.74/src/hardware/mixer.cpp--- dosbox-0.74.bak/src/hardware/mixer.cpp 2010-09-01 21:20:45.000000000 +0200+++ dosbox-0.74/src/hardware/mixer.cpp 2010-09-01 21:35:50.000000000 +0200@@ -72,6 +72,7 @@bool nosound;Bit32u freq;Bit32u blocksize;+ bool swapstereo;} mixer;Bit8u MixTemp[MIXER_BUFSIZE];@@ -167,6 +168,9 @@Bitu mixpos=mixer.pos+done;freq_index&=MIXER_REMAIN;Bitu pos=0;Bitu new_pos;+ int offset[2];+ offset[0] = mixer.swapstereo ? 1:0;+ offset[1] = mixer.swapstereo ? 0:1;goto thestart;for (;;) {@@ -180,15 +184,15 @@if ( sizeof( Type) == 1) {if (!signeddata) {if (stereo) {- diff[0]=(((Bit8s)(data[pos*2+0] ^ 0x80)) << 8)-last[0];- diff[1]=(((Bit8s)(data[pos*2+1] ^ 0x80)) << 8)-last[1];+ diff[0]=(((Bit8s)(data[pos*2+offset[0]] ^ 0x80)) << 8)-last[0];+ diff[1]=(((Bit8s)(data[pos*2+offset[1]] ^ 0x80)) << 8)-last[1];} else {diff[0]=(((Bit8s)(data[pos] ^ 0x80)) << 8)-last[0];}} else {if (stereo) {- diff[0]=(data[pos*2+0] << 8)-last[0];- diff[1]=(data[pos*2+1] << 8)-last[1];+ diff[0]=(data[pos*2+offset[0]] << 8)-last[0];+ diff[1]=(data[pos*2+offset[1]] << 8)-last[1];} else {diff[0]=(data[pos] << 8)-last[0];}@@ -198,8 +202,8 @@if (signeddata) {if (stereo) {if (nativeorder) {- diff[0]=data[pos*2+0]-last[0];- diff[1]=data[pos*2+1]-last[1];
+ diff[0]=data[pos*2+offset[0]]-last[0];+ diff[1]=data[pos*2+offset[1]]-last[1];} else {if ( sizeof( Type) == 2) {diff[0]=(Bit16s)host_readw((HostPt)&data[pos*2+0])-last[0];@@ -223,8 +227,8 @@} else {if (stereo) {if (nativeorder) {- diff[0]=(Bits)data[pos*2+0]-32768-last[0];- diff[1]=(Bits)data[pos*2+1]-32768-last[1];+ diff[0]=(Bits)data[pos*2+offset[0]]-32768-last[0];+ diff[1]=(Bits)data[pos*2+offset[1]]-32768-last[1];} else {if ( sizeof( Type) == 2) {diff[0]=(Bits)host_readw((HostPt)&data[pos*2+0])-32768-last[0];@@ -621,6 +625,7 @@mixer.freq=section->Get_int("rate");mixer.nosound=section->Get_bool("nosound");mixer.blocksize=section->Get_int("blocksize");+ mixer.swapstereo=section->Get_bool("swapstereo");/* Initialize the internal stuff */mixer.channels=0;
