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110 lines
3.2 KiB
110 lines
3.2 KiB
/* |
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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 FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "dsputil.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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