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Alter library to support streaming from a ringbuffer #62

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Alter library to support streaming from a ringbuffer #62

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6 changes: 5 additions & 1 deletion include/rnnoise.h
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Original file line number Diff line number Diff line change
Expand Up @@ -49,4 +49,8 @@ RNNOISE_EXPORT DenoiseState *rnnoise_create();

RNNOISE_EXPORT void rnnoise_destroy(DenoiseState *st);

RNNOISE_EXPORT float rnnoise_process_frame(DenoiseState *st, float *out, const float *in);
RNNOISE_EXPORT size_t rnnoise_need_samples(DenoiseState *st);

RNNOISE_EXPORT size_t rnnoise_add_samples(DenoiseState *st, const float *in, size_t samples);

RNNOISE_EXPORT float rnnoise_process_frame(DenoiseState *st, float *out);
34 changes: 28 additions & 6 deletions src/denoise.c
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Expand Up @@ -84,6 +84,9 @@ typedef struct {
} CommonState;

struct DenoiseState {
float input[FRAME_SIZE];
size_t input_pos;

float analysis_mem[FRAME_SIZE];
float cepstral_mem[CEPS_MEM][NB_BANDS];
int memid;
Expand Down Expand Up @@ -468,22 +471,41 @@ void pitch_filter(kiss_fft_cpx *X, const kiss_fft_cpx *P, const float *Ex, const
}
}

float rnnoise_process_frame(DenoiseState *st, float *out, const float *in) {
size_t rnnoise_need_samples(DenoiseState *st) {
return FRAME_SIZE - st->input_pos;
}

size_t rnnoise_add_samples(DenoiseState *st, const float *in, size_t samples) {
static const float a_hp[2] = {-1.99599, 0.99600};
static const float b_hp[2] = {-2, 1};

if (FRAME_SIZE - st->input_pos < samples)
samples = FRAME_SIZE - st->input_pos;

if (!samples)
return 0;

biquad(st->input + st->input_pos, st->mem_hp_x, in, b_hp, a_hp, samples);
st->input_pos += samples;

return samples;
}

float rnnoise_process_frame(DenoiseState *st, float *out) {
int i;
kiss_fft_cpx X[FREQ_SIZE];
kiss_fft_cpx P[WINDOW_SIZE];
float x[FRAME_SIZE];
float Ex[NB_BANDS], Ep[NB_BANDS];
float Exp[NB_BANDS];
float features[NB_FEATURES];
float g[NB_BANDS];
float gf[FREQ_SIZE]={1};
float vad_prob = 0;
int silence;
static const float a_hp[2] = {-1.99599, 0.99600};
static const float b_hp[2] = {-2, 1};
biquad(x, st->mem_hp_x, in, b_hp, a_hp, FRAME_SIZE);
silence = compute_frame_features(st, X, P, Ex, Ep, Exp, features, x);

celt_assert(st->input_pos == FRAME_SIZE);
silence = compute_frame_features(st, X, P, Ex, Ep, Exp, features, st->input);
st->input_pos = 0;

if (!silence) {
compute_rnn(&st->rnn, g, &vad_prob, features);
Expand Down