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Util: Allow audio resampler to use different interpolators

This commit is contained in:
Vicki Pfau 2024-04-21 16:32:45 -07:00
parent afa8a25b5b
commit febedc3a38
3 changed files with 35 additions and 8 deletions
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9
include/mgba-util/audio-resampler.h
View File

@ -21,11 +21,16 @@ struct mAudioResampler {
double timestamp;
double lowWaterMark;
double highWaterMark;
struct mInterpolatorSinc interp;
enum mInterpolatorType interpType;
union {
struct mInterpolator interp;
struct mInterpolatorSinc sinc;
struct mInterpolatorCosine cosine;
};
bool consume;
};
void mAudioResamplerInit(struct mAudioResampler*);
void mAudioResamplerInit(struct mAudioResampler*, enum mInterpolatorType);
void mAudioResamplerDeinit(struct mAudioResampler*);
void mAudioResamplerSetSource(struct mAudioResampler*, struct mAudioBuffer* source, double rate, bool consume);
void mAudioResamplerSetDestination(struct mAudioResampler*, struct mAudioBuffer* destination, double rate);

5
include/mgba-util/interpolator.h
View File

@ -10,6 +10,11 @@
CXX_GUARD_START
enum mInterpolatorType {
mINTERPOLATOR_SINC,
mINTERPOLATOR_COSINE,
};
struct mInterpolationData {
int16_t (*at)(int index, const void* context);
void* context;

29
src/util/audio-resampler.c
View File

@ -22,15 +22,32 @@ static int16_t _sampleAt(int index, const void* context) {
return mAudioBufferPeek(data->resampler->source, data->channel, index);
}
void mAudioResamplerInit(struct mAudioResampler* resampler) {
void mAudioResamplerInit(struct mAudioResampler* resampler, enum mInterpolatorType interpType) {
memset(resampler, 0, sizeof(*resampler));
mInterpolatorSincInit(&resampler->interp, 0, 0);
resampler->lowWaterMark = resampler->interp.width;
resampler->highWaterMark = 0;
resampler->interpType = interpType;
switch (interpType) {
case mINTERPOLATOR_SINC:
mInterpolatorSincInit(&resampler->sinc, 0, 0);
resampler->lowWaterMark = resampler->sinc.width;
resampler->highWaterMark = resampler->sinc.width;
break;
case mINTERPOLATOR_COSINE:
mInterpolatorCosineInit(&resampler->cosine, 0);
resampler->lowWaterMark = 0;
resampler->highWaterMark = 1;
break;
}
}
void mAudioResamplerDeinit(struct mAudioResampler* resampler) {
mInterpolatorSincDeinit(&resampler->interp);
switch (resampler->interpType) {
case mINTERPOLATOR_SINC:
mInterpolatorSincDeinit(&resampler->sinc);
break;
case mINTERPOLATOR_COSINE:
mInterpolatorCosineDeinit(&resampler->cosine);
break;
}
resampler->source = NULL;
resampler->destination = NULL;
}
@ -50,7 +67,7 @@ size_t mAudioResamplerProcess(struct mAudioResampler* resampler) {
int16_t sampleBuffer[MAX_CHANNELS] = {0};
double timestep = resampler->sourceRate / resampler->destRate;
double timestamp = resampler->timestamp;
struct mInterpolator* interp = &resampler->interp.d;
struct mInterpolator* interp = &resampler->interp;
struct mAudioResamplerData context = {
.resampler = resampler,
};