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DSP: Implement audio filters (simple, biquad)

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This commit is contained in:
MerryMage 2016-03-26 02:20:34 +00:00
parent efd1c3f8c3
commit 2a99464ef1
5 changed files with 275 additions and 7 deletions
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17
src/audio_core/hle/dsp.h
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@ -126,8 +126,11 @@ struct SourceConfiguration {
union {
u32_le dirty_raw;
BitField<0, 1, u32_le> format_dirty;
BitField<1, 1, u32_le> mono_or_stereo_dirty;
BitField<2, 1, u32_le> adpcm_coefficients_dirty;
BitField<3, 1, u32_le> partial_embedded_buffer_dirty; ///< Tends to be set when a looped buffer is queued.
BitField<4, 1, u32_le> partial_reset_flag;
BitField<16, 1, u32_le> enable_dirty;
BitField<17, 1, u32_le> interpolation_dirty;
@ -143,8 +146,7 @@ struct SourceConfiguration {
BitField<27, 1, u32_le> gain_2_dirty;
BitField<28, 1, u32_le> sync_dirty;
BitField<29, 1, u32_le> reset_flag;
BitField<31, 1, u32_le> embedded_buffer_dirty;
BitField<30, 1, u32_le> embedded_buffer_dirty;
};
// Gain control
@ -175,7 +177,8 @@ struct SourceConfiguration {
/**
* This is the simplest normalized first-order digital recursive filter.
* The transfer function of this filter is:
* H(z) = b0 / (1 + a1 z^-1)
* H(z) = b0 / (1 - a1 z^-1)
* Note the feedbackward coefficient is negated.
* Values are signed fixed point with 15 fractional bits.
*/
struct SimpleFilter {
@ -192,11 +195,11 @@ struct SourceConfiguration {
* Values are signed fixed point with 14 fractional bits.
*/
struct BiquadFilter {
s16_le b0;
s16_le b1;
s16_le b2;
s16_le a1;
s16_le a2;
s16_le a1;
s16_le b2;
s16_le b1;
s16_le b0;
};
union {