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