fwgan.h

/* Copyright (c) 2023 Amazon */
/*
   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,
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   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef FWGAN_H
#define FWGAN_H

#include "freq.h"
#include "fwgan_data.h"

#define FWGAN_CONT_SAMPLES 320
#define NB_SUBFRAMES 4
#define SUBFRAME_SIZE 40
#define FWGAN_FRAME_SIZE (NB_SUBFRAMES*SUBFRAME_SIZE)
#define CONT_PCM_INPUTS 320
#define MAX_CONT_SIZE CONT_NET_0_OUT_SIZE
#define FWGAN_GAMMA 0.92f
#define FWGAN_DEEMPHASIS 0.85f

/* FIXME: Derive those from the model rather than hardcoding. */
#define FWC1_STATE_SIZE 512
#define FWC2_STATE_SIZE 512
#define FWC3_STATE_SIZE 256
#define FWC4_STATE_SIZE 256
#define FWC5_STATE_SIZE 128
#define FWC6_STATE_SIZE 128
#define FWC7_STATE_SIZE 80

typedef struct {
  FWGAN model;
  int arch;
  int cont_initialized;
  float embed_phase[2];
  float last_gain;
  float last_lpc[LPC_ORDER];
  float syn_mem[LPC_ORDER];
  float preemph_mem;
  float deemph_mem;
  float pcm_buf[FWGAN_FRAME_SIZE];
  float cont[CONT_NET_10_OUT_SIZE];
  float cont_conv1_mem[FEAT_IN_CONV1_CONV_STATE_SIZE];
  float rnn_state[RNN_GRU_STATE_SIZE];
  float fwc1_state[FWC1_STATE_SIZE];
  float fwc2_state[FWC2_STATE_SIZE];
  float fwc3_state[FWC3_STATE_SIZE];
  float fwc4_state[FWC4_STATE_SIZE];
  float fwc5_state[FWC5_STATE_SIZE];
  float fwc6_state[FWC6_STATE_SIZE];
  float fwc7_state[FWC7_STATE_SIZE];
} FWGANState;

void fwgan_init(FWGANState *st);
int fwgan_load_model(FWGANState *st, const unsigned char *data, int len);

void fwgan_cont(FWGANState *st, const float *pcm0, const float *features0);

void fwgan_synthesize(FWGANState *st, float *pcm, const float *features);
void fwgan_synthesize_int(FWGANState *st, opus_int16 *pcm, const float *features);


#endif /* FWGAN_H */