yading@10: /*
yading@10:  * SIPR / ACELP.NET decoder
yading@10:  *
yading@10:  * Copyright (c) 2008 Vladimir Voroshilov
yading@10:  * Copyright (c) 2009 Vitor Sessak
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_SIPR_H
yading@10: #define AVCODEC_SIPR_H
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "acelp_pitch_delay.h"
yading@10: #include "libavutil/mem.h"
yading@10: 
yading@10: #define LP_FILTER_ORDER_16k  16
yading@10: #define L_SUBFR_16k          80
yading@10: #define PITCH_MIN            30
yading@10: #define PITCH_MAX            281
yading@10: 
yading@10: #define LSFQ_DIFF_MIN        (0.0125 * M_PI)
yading@10: 
yading@10: #define LP_FILTER_ORDER      10
yading@10: 
yading@10: /** Number of past samples needed for excitation interpolation */
yading@10: #define L_INTERPOL           (LP_FILTER_ORDER + 1)
yading@10: 
yading@10: /**  Subframe size for all modes except 16k */
yading@10: #define SUBFR_SIZE           48
yading@10: 
yading@10: #define SUBFRAME_COUNT_16k   2
yading@10: 
yading@10: typedef enum {
yading@10:     MODE_16k,
yading@10:     MODE_8k5,
yading@10:     MODE_6k5,
yading@10:     MODE_5k0,
yading@10:     MODE_COUNT
yading@10: } SiprMode;
yading@10: 
yading@10: typedef struct SiprParameters {
yading@10:     int ma_pred_switch;        ///< switched moving average predictor
yading@10:     int vq_indexes[5];
yading@10:     int pitch_delay[5];        ///< pitch delay
yading@10:     int gp_index[5];           ///< adaptive-codebook gain indexes
yading@10:     int16_t fc_indexes[5][10]; ///< fixed-codebook indexes
yading@10:     int gc_index[5];           ///< fixed-codebook gain indexes
yading@10: } SiprParameters;
yading@10: 
yading@10: typedef struct SiprContext {
yading@10:     AVCodecContext *avctx;
yading@10: 
yading@10:     SiprMode mode;
yading@10: 
yading@10:     float past_pitch_gain;
yading@10:     float lsf_history[LP_FILTER_ORDER_16k];
yading@10: 
yading@10:     float excitation[L_INTERPOL + PITCH_MAX + 2 * L_SUBFR_16k];
yading@10: 
yading@10:     DECLARE_ALIGNED(16, float, synth_buf)[LP_FILTER_ORDER + 5*SUBFR_SIZE + 6];
yading@10: 
yading@10:     float lsp_history[LP_FILTER_ORDER];
yading@10:     float gain_mem;
yading@10:     float energy_history[4];
yading@10:     float highpass_filt_mem[2];
yading@10:     float postfilter_mem[PITCH_DELAY_MAX + LP_FILTER_ORDER];
yading@10: 
yading@10:     /* 5k0 */
yading@10:     float tilt_mem;
yading@10:     float postfilter_agc;
yading@10:     float postfilter_mem5k0[PITCH_DELAY_MAX + LP_FILTER_ORDER];
yading@10:     float postfilter_syn5k0[LP_FILTER_ORDER + SUBFR_SIZE*5];
yading@10: 
yading@10:     /* 16k */
yading@10:     int pitch_lag_prev;
yading@10:     float iir_mem[LP_FILTER_ORDER_16k+1];
yading@10:     float filt_buf[2][LP_FILTER_ORDER_16k+1];
yading@10:     float *filt_mem[2];
yading@10:     float mem_preemph[LP_FILTER_ORDER_16k];
yading@10:     float synth[LP_FILTER_ORDER_16k];
yading@10:     double lsp_history_16k[16];
yading@10: 
yading@10:     void (*decode_frame)(struct SiprContext *ctx, SiprParameters *params,
yading@10:                          float *out_data);
yading@10: } SiprContext;
yading@10: 
yading@10: extern const float ff_pow_0_5[16];
yading@10: 
yading@10: void ff_sipr_init_16k(SiprContext *ctx);
yading@10: 
yading@10: void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params,
yading@10:                               float *out_data);
yading@10: 
yading@10: #endif /* AVCODEC_SIPR_H */