private.h

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/* GMR-1 AMBE vocoder private header */
 
/* (C) 2011-2019 by Sylvain Munaut <tnt@246tNt.com>
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef __OSMO_GMR1_CODEC_PRIVATE_H__
#define __OSMO_GMR1_CODEC_PRIVATE_H__
 
#include <stdint.h>
 
 
#define AMBE_RATE 8000          
enum ambe_frame_type
{
        AMBE_SPEECH,            
        AMBE_SILENCE,           
        AMBE_TONE,              
};
 
struct ambe_raw_params
{
        uint8_t pitch;          
        uint8_t pitch_interp;   
        uint8_t gain;           
        uint8_t v_uv;           
        uint8_t sf1_prba12;     
        uint8_t sf1_prba34;     
        uint8_t sf1_prba57;     
        uint8_t sf1_hoc[4];     
        uint8_t sf0_mag_interp; 
        uint8_t sf0_perr_14;    
        uint8_t sf0_perr_58;    
};
 
struct ambe_subframe
{
        float f0;               
        float f0log;            
        float w0;               
        int L;                  
        int Lb[4];              
        int v_uv[8];            
        int Vl[56];             
        float gain;             
        float Mlog[56];         
        float Ml[56];           
};
 
struct ambe_synth
{
        int16_t u_prev;         
        float uw_prev[121];     
        float psi1;             
        float phi[56];          
        float SE;               
};
 
struct ambe_decoder
{
        float tone_phase_f1;    
        float tone_phase_f2;    
        struct ambe_subframe sf_prev;   
        struct ambe_synth synth;        
};
 
/* From ambe.c */
void ambe_decode_init(struct ambe_decoder *dec);
void ambe_decode_fini(struct ambe_decoder *dec);
 
int ambe_decode_frame(struct ambe_decoder *dec,
                      int16_t *audio, int N,
                      const uint8_t *frame, int bad);
int ambe_decode_dtx(struct ambe_decoder *dec,
                    int16_t *audio, int N);
 
/* From frame.c */
void ambe_frame_unpack_raw(struct ambe_raw_params *rp, const uint8_t *frame);
void ambe_frame_decode_params(struct ambe_subframe *sf,
                              struct ambe_subframe *sf_prev,
                              struct ambe_raw_params *rp);
void ambe_subframe_expand(struct ambe_subframe *sf);
 
/* From math.c */
#define M_PIf (3.141592653589793f)      
float cosf_fast(float angle);
float sinf_fast(float angle);
void ambe_fdct(float *out, float *in, int N, int M);
void ambe_idct(float *out, float *in, int N, int M);
void ambe_fdft_fc(float *out_i, float *out_q, float *in, int N, int M);
void ambe_idft_cf(float *out, float *in_i, float *in_q, int N, int M);
 
/* From synth.c */
void ambe_synth_init(struct ambe_synth *synth);
void ambe_synth_enhance(struct ambe_synth *synth, struct ambe_subframe *sf);
void ambe_synth_audio(struct ambe_synth *synth, int16_t *audio,
                      struct ambe_subframe *sf,
                      struct ambe_subframe *sf_prev);
 
/* From tables.c */
extern const uint8_t ambe_hpg_tbl[48][4];
extern const float ambe_gain_tbl[256][2];
extern const uint16_t ambe_v_uv_tbl[64];
extern const float ambe_prba12_tbl[128][2];
extern const float ambe_prba34_tbl[64][2];
extern const float ambe_prba57_tbl[128][3];
extern const float ambe_hoc0_tbl[128][4];
extern const float ambe_hoc1_tbl[64][4];
extern const float ambe_hoc2_tbl[64][4];
extern const float ambe_hoc3_tbl[64][4];
extern const float ambe_sf0_interp_tbl[4];
extern const float ambe_sf0_perr14_tbl[64][4];
extern const float ambe_sf0_perr58_tbl[32][4];
 
/* From tone.c */
int ambe_decode_tone(struct ambe_decoder *dec,
                     int16_t *audio, int N, const uint8_t *frame);
 
 
#endif /* __OSMO_GMR1_CODEC_PRIVATE_H__ */