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Update release notes for filters.

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David Reid
2020-02-26 18:00:48 +10:00
parent 68556168b0
commit d26154ca36
1 changed files with 21 additions and 7 deletions
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miniaudio.h
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@@ -119,18 +119,32 @@ flexible, to prevent the parameter list getting too long, and to prevent API bre
`ma_calculate_frame_count_after_src()` has been renamed to `ma_calculate_frame_count_after_resampling()` for consistency with the new `ma_resampler` API.
Biquad Filters
--------------
Filters
-------
A generic biquad filter has been added. This is used via the `ma_biquad` API. The biquad filter is used as the basis for the low-pass, high-pass and band-pass
filters. It supports 32-bit floating point samples which runs on a floating point pipeline and 16-bit signed integer samples which runs on a 32-bit fixed point
pipeline. Both formats use transposed direct form 2.
In addition to biquads, the following filters have also been added:
Low-Pass, High-Pass and Band-Pass Filters
-----------------------------------------
APIs for low-pass, high-pass and band-pass filtering has been added. By themselves they are second order filters, but can be extended to higher orders by
chaining them together. Low-pass, high-pass and band-pass filtering is achieved via the `ma_lpf2`, `ma_hpf2` and `ma_bpf2` APIs respectively. Since these
filters are just biquad filters, they support both 32-bit floating point and 16-bit signed integer formats.
|-------------|-------------------------------------------------------------------|
| API | Description |
|-------------|-------------------------------------------------------------------|
| ma_lpf1 | First order low-pass filter |
| ma_lpf2 | Second order low-pass filter |
| ma_lpf | Low-pass filter with configurable order (up to 8) |
| ma_hpf1 | First order high-pass filter |
| ma_hpf2 | Second order high-pass filter |
| ma_hpf | High-pass filter with configuratble order (up to 8) |
| ma_bpf2 | Second order band-pass filter |
| ma_bpf | Band-pass filter with configurable order (up to 8, multiple of 2) |
| ma_peak2 | Second order peaking filter |
| ma_notch2 | Second order notching filter |
| ma_loshelf2 | Second order low shelf filter |
| ma_hishelf2 | Second order high shelf filter |
|-------------|-------------------------------------------------------------------|
These filters all support 32-bit floating point and 16-bit signed integer formats natively. Other formats need to be converted beforehand.
Sine, Square, Triangle and Sawtooth Waveforms