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interpolate: Interpolate on a frame-by-frame basis

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MerryMage
2017-08-03 12:22:51 +01:00
parent 035716d57b
commit 933508e2a2
3 changed files with 74 additions and 88 deletions
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27
src/audio_core/interpolate.h
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@ -6,6 +6,7 @@
#include <array>
#include <vector>
#include "audio_core/hle/common.h"
#include "common/common_types.h"
namespace AudioInterp {
@ -14,31 +15,35 @@ namespace AudioInterp {
using StereoBuffer16 = std::vector<std::array<s16, 2>>;
struct State {
// Two historical samples.
/// Two historical samples.
std::array<s16, 2> xn1 = {}; ///< x[n-1]
std::array<s16, 2> xn2 = {}; ///< x[n-2]
/// Current fractional position.
u64 fposition = 0;
};
/**
* No interpolation. This is equivalent to a zero-order hold. There is a two-sample predelay.
* @param state Interpolation state.
* @param input Input buffer.
* @param rate_multiplier Stretch factor. Must be a positive non-zero value.
* rate_multiplier > 1.0 performs decimation and rate_multipler < 1.0
* performs upsampling.
* @return The resampled audio buffer.
* @param rate Stretch factor. Must be a positive non-zero value.
* rate > 1.0 performs decimation and rate < 1.0 performs upsampling.
* @param output The resampled audio buffer.
* @param outputi The index of output to start writing to.
*/
StereoBuffer16 None(State& state, const StereoBuffer16& input, float rate_multiplier);
void None(State& state, StereoBuffer16& input, float rate, DSP::HLE::StereoFrame16& output,
size_t& outputi);
/**
* Linear interpolation. This is equivalent to a first-order hold. There is a two-sample predelay.
* @param state Interpolation state.
* @param input Input buffer.
* @param rate_multiplier Stretch factor. Must be a positive non-zero value.
* rate_multiplier > 1.0 performs decimation and rate_multipler < 1.0
* performs upsampling.
* @return The resampled audio buffer.
* @param rate Stretch factor. Must be a positive non-zero value.
* rate > 1.0 performs decimation and rate < 1.0 performs upsampling.
* @param output The resampled audio buffer.
* @param outputi The index of output to start writing to.
*/
StereoBuffer16 Linear(State& state, const StereoBuffer16& input, float rate_multiplier);
void Linear(State& state, StereoBuffer16& input, float rate, DSP::HLE::StereoFrame16& output,
size_t& outputi);
} // namespace AudioInterp