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Implement low-pass voice filtering, untested because I couldn't find any game using it

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This commit is contained in:
Pierre Bourdon 2013-01-20 16:15:42 +01:00
parent 25419ed827
commit c662901504
2 changed files with 13 additions and 6 deletions
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6
Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_AXStructs.h
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@ -230,9 +230,9 @@ struct PBADPCMLoopInfo
struct PBLowPassFilter struct PBLowPassFilter
{ {
u16 enabled; u16 enabled;
u16 yn1; s16 yn1;
u16 a0; s16 a0;
u16 b0; s16 b0;
}; };
struct AXPB struct AXPB

13
Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_AX_Voice.h
View File

@ -340,6 +340,15 @@ void MixAdd(int* out, const s16* input, u32 count, u16* pvol, s16* dpop, bool ra
} }
} }
// Execute a low pass filter on the samples using one history value. Returns
// the new history value.
s16 LowPassFilter(s16* samples, u32 count, s16 yn1, s16 a0, s16 b0)
{
for (u32 i = 0; i < count; ++i)
yn1 = samples[i] = (s32)a0 * samples[i] - (s32)b0 * yn1;
return yn1;
}
// Process 1ms of audio (for AX GC) or 3ms of audio (for AX Wii) from a PB and // Process 1ms of audio (for AX GC) or 3ms of audio (for AX Wii) from a PB and
// mix it to the output buffers. // mix it to the output buffers.
void ProcessVoice(PB_TYPE& pb, const AXBuffers& buffers, AXMixControl mctrl) void ProcessVoice(PB_TYPE& pb, const AXBuffers& buffers, AXMixControl mctrl)
@ -362,9 +371,7 @@ void ProcessVoice(PB_TYPE& pb, const AXBuffers& buffers, AXMixControl mctrl)
// Optionally, execute a low pass filter // Optionally, execute a low pass filter
if (pb.lpf.enabled) if (pb.lpf.enabled)
{ pb.lpf.yn1 = LowPassFilter(samples, SAMPLES_PER_FRAME, pb.lpf.yn1, pb.lpf.a0, pb.lpf.b0);
// TODO
}
// Mix LRS, AUXA and AUXB depending on mixer_control // Mix LRS, AUXA and AUXB depending on mixer_control
// TODO: Handle DPL2 on AUXB. // TODO: Handle DPL2 on AUXB.