mirror of
https://github.com/TorqueGameEngines/Torque3D.git
synced 2026-02-22 16:13:45 +00:00
a745fc3757
added libraries: opus flac libsndfile updated: libvorbis libogg openal - Everything works as expected for now. Bare in mind libsndfile needed the check for whether or not it could find the xiph libraries removed in order for this to work.
47 lines
1.6 KiB
C++
47 lines
1.6 KiB
C++
#ifndef POLYPHASE_RESAMPLER_H
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#define POLYPHASE_RESAMPLER_H
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#include <vector>
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using uint = unsigned int;
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/* This is a polyphase sinc-filtered resampler. It is built for very high
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* quality results, rather than real-time performance.
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*
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* Upsample Downsample
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*
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* p/q = 3/2 p/q = 3/5
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*
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* M-+-+-+-> M-+-+-+->
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* -------------------+ ---------------------+
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* p s * f f f f|f| | p s * f f f f f |
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* | 0 * 0 0 0|0|0 | | 0 * 0 0 0 0|0| |
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* v 0 * 0 0|0|0 0 | v 0 * 0 0 0|0|0 |
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* s * f|f|f f f | s * f f|f|f f |
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* 0 * |0|0 0 0 0 | 0 * 0|0|0 0 0 |
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* --------+=+--------+ 0 * |0|0 0 0 0 |
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* d . d .|d|. d . d ----------+=+--------+
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* d . . . .|d|. . . .
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* q->
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* q-+-+-+->
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*
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* P_f(i,j) = q i mod p + pj
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* P_s(i,j) = floor(q i / p) - j
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* d[i=0..N-1] = sum_{j=0}^{floor((M - 1) / p)} {
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* { f[P_f(i,j)] s[P_s(i,j)], P_f(i,j) < M
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* { 0, P_f(i,j) >= M. }
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*/
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struct PPhaseResampler {
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void init(const uint srcRate, const uint dstRate);
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void process(const uint inN, const double *in, const uint outN, double *out);
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explicit operator bool() const noexcept { return !mF.empty(); }
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private:
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uint mP, mQ, mM, mL;
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std::vector<double> mF;
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};
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#endif /* POLYPHASE_RESAMPLER_H */
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