opus-embedded-sys 0.1.1

Bindings to libopus for decoding Opus audio on embedded systems
Documentation 
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/* Copyright (c) 2023 Amazon
   Written by Jan Buethe */
/*
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   - Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

   - Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef NNDSP_H
#define NNDSP_H

#include "opus_types.h"
#include "nnet.h"
#include <string.h>


#define ADACONV_MAX_KERNEL_SIZE 16
#define ADACONV_MAX_INPUT_CHANNELS 2
#define ADACONV_MAX_OUTPUT_CHANNELS 2
#define ADACONV_MAX_FRAME_SIZE 80
#define ADACONV_MAX_OVERLAP_SIZE 40

#define ADACOMB_MAX_LAG 300
#define ADACOMB_MAX_KERNEL_SIZE 16
#define ADACOMB_MAX_FRAME_SIZE 80
#define ADACOMB_MAX_OVERLAP_SIZE 40

#define ADASHAPE_MAX_INPUT_DIM 512
#define ADASHAPE_MAX_FRAME_SIZE 160

/*#define DEBUG_NNDSP*/
#ifdef DEBUG_NNDSP
#include <stdio.h>
#endif


void print_float_vector(const char* name, const float *vec, int length);

typedef struct {
    float history[ADACONV_MAX_KERNEL_SIZE * ADACONV_MAX_INPUT_CHANNELS];
    float last_kernel[ADACONV_MAX_KERNEL_SIZE * ADACONV_MAX_INPUT_CHANNELS * ADACONV_MAX_OUTPUT_CHANNELS];
    float last_gain;
} AdaConvState;


typedef struct {
    float history[ADACOMB_MAX_KERNEL_SIZE + ADACOMB_MAX_LAG];
    float last_kernel[ADACOMB_MAX_KERNEL_SIZE];
    float last_global_gain;
    int last_pitch_lag;
} AdaCombState;


typedef struct {
    float conv_alpha1f_state[ADASHAPE_MAX_INPUT_DIM];
    float conv_alpha1t_state[ADASHAPE_MAX_INPUT_DIM];
    float conv_alpha2_state[ADASHAPE_MAX_FRAME_SIZE];
} AdaShapeState;

void init_adaconv_state(AdaConvState *hAdaConv);

void init_adacomb_state(AdaCombState *hAdaComb);

void init_adashape_state(AdaShapeState *hAdaShape);

void compute_overlap_window(float *window, int overlap_size);

void adaconv_process_frame(
    AdaConvState* hAdaConv,
    float *x_out,
    const float *x_in,
    const float *features,
    const LinearLayer *kernel_layer,
    const LinearLayer *gain_layer,
    int feature_dim, /* not strictly necessary */
    int frame_size,
    int overlap_size,
    int in_channels,
    int out_channels,
    int kernel_size,
    int left_padding,
    float filter_gain_a,
    float filter_gain_b,
    float shape_gain,
    float *window,
    int arch
);

void adacomb_process_frame(
    AdaCombState* hAdaComb,
    float *x_out,
    const float *x_in,
    const float *features,
    const LinearLayer *kernel_layer,
    const LinearLayer *gain_layer,
    const LinearLayer *global_gain_layer,
    int pitch_lag,
    int feature_dim,
    int frame_size,
    int overlap_size,
    int kernel_size,
    int left_padding,
    float filter_gain_a,
    float filter_gain_b,
    float log_gain_limit,
    float *window,
    int arch
);

void adashape_process_frame(
    AdaShapeState *hAdaShape,
    float *x_out,
    const float *x_in,
    const float *features,
    const LinearLayer *alpha1f,
    const LinearLayer *alpha1t,
    const LinearLayer *alpha2,
    int feature_dim,
    int frame_size,
    int avg_pool_k,
    int arch
);

#endif