mirror of
https://github.com/google/liblc3.git
synced 2026-05-21 02:48:01 +00:00
daa580235e
Duplicate interfaces for HR mode spec: Remove intermediate quantized table fix: legacy lc3_frame_bytes() and lc3_resolve_bitrate() Cosmetic: rename fast_xxx math function to lc3_xxx
162 lines
4.3 KiB
C
162 lines
4.3 KiB
C
/******************************************************************************
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*
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* Copyright 2022 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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#ifndef __LC3_TABLES_H
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#define __LC3_TABLES_H
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#include "common.h"
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#include "bits.h"
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/**
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* Characteristics
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*
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* ns Number of temporal samples / frequency coefficients within a frame
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*
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* ne Number of encoded frequency coefficients
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*
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* nd Number of MDCT delayed samples, sum of half a frame and an ovelap
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* of future by 1.25 ms (2.5ms, 5ms and 10ms frame durations),
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* or 2 ms (7.5ms frame duration).
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*
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* nh Number of 18 ms samples of the history buffer, aligned on a frame
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*
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* nt Number of 1.25 ms previous samples
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*/
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extern const int lc3_ns_2m5[LC3_NUM_SRATE];
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extern const int lc3_ne_2m5[LC3_NUM_SRATE];
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extern const int lc3_ns_4m [LC3_NUM_SRATE];
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static inline int lc3_ns(enum lc3_dt dt, enum lc3_srate sr) {
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return lc3_ns_2m5[sr] * (1 + dt);
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}
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static inline int lc3_ne(enum lc3_dt dt, enum lc3_srate sr) {
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return lc3_ne_2m5[sr] * (1 + dt);
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}
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static inline int lc3_nd(enum lc3_dt dt, enum lc3_srate sr) {
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return ( lc3_ns(dt, sr) +
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(dt == LC3_DT_7M5 ? lc3_ns_4m[sr] : lc3_ns_2m5[sr]) ) >> 1;
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}
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static inline int lc3_nh(enum lc3_dt dt, enum lc3_srate sr) {
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return sr > LC3_SRATE_48K_HR ? 0 :
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(8 + (dt == LC3_DT_7M5)) * lc3_ns_2m5[sr];
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}
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static inline int lc3_nt(enum lc3_srate sr) {
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return lc3_ns_2m5[sr] >> 1;
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}
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#define LC3_MAX_SRATE_HZ ( LC3_PLUS_HR ? 96000 : 48000 )
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#define LC3_MAX_NS ( LC3_NS(10000, LC3_MAX_SRATE_HZ) )
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#define LC3_MAX_NE ( LC3_PLUS_HR ? LC3_MAX_NS : LC3_NS(10000, 40000) )
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/**
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* Limits on size of frame
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*/
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extern const int lc3_frame_bytes_hr_lim
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[LC3_NUM_DT][LC3_NUM_SRATE - LC3_SRATE_48K_HR][2];
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static inline int lc3_min_frame_bytes(enum lc3_dt dt, enum lc3_srate sr) {
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return !lc3_hr(sr) ? LC3_MIN_FRAME_BYTES :
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lc3_frame_bytes_hr_lim[dt][sr - LC3_SRATE_48K_HR][0];
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}
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static inline int lc3_max_frame_bytes(enum lc3_dt dt, enum lc3_srate sr) {
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return !lc3_hr(sr) ? LC3_MAX_FRAME_BYTES :
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lc3_frame_bytes_hr_lim[dt][sr - LC3_SRATE_48K_HR][1];
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}
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/**
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* MDCT Twiddles and window coefficients
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*/
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struct lc3_fft_bf3_twiddles { int n3; const struct lc3_complex (*t)[2]; };
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struct lc3_fft_bf2_twiddles { int n2; const struct lc3_complex *t; };
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struct lc3_mdct_rot_def { int n4; const struct lc3_complex *w; };
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extern const struct lc3_fft_bf3_twiddles *lc3_fft_twiddles_bf3[];
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extern const struct lc3_fft_bf2_twiddles *lc3_fft_twiddles_bf2[][3];
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extern const struct lc3_mdct_rot_def *lc3_mdct_rot[LC3_NUM_DT][LC3_NUM_SRATE];
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extern const float *lc3_mdct_win[LC3_NUM_DT][LC3_NUM_SRATE];
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/**
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* Limits of bands
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*/
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#define LC3_MAX_BANDS 64
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extern const int lc3_num_bands[LC3_NUM_DT][LC3_NUM_SRATE];
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extern const int *lc3_band_lim[LC3_NUM_DT][LC3_NUM_SRATE];
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/**
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* SNS Quantization
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*/
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extern const float lc3_sns_lfcb[32][8];
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extern const float lc3_sns_hfcb[32][8];
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struct lc3_sns_vq_gains {
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int count; const float *v;
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};
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extern const struct lc3_sns_vq_gains lc3_sns_vq_gains[4];
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extern const int32_t lc3_sns_mpvq_offsets[][11];
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/**
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* TNS Arithmetic Coding
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*/
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extern const struct lc3_ac_model lc3_tns_order_models[];
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extern const uint16_t lc3_tns_order_bits[][8];
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extern const struct lc3_ac_model lc3_tns_coeffs_models[];
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extern const uint16_t lc3_tns_coeffs_bits[][17];
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/**
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* Long Term Postfilter
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*/
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extern const float *lc3_ltpf_cnum[LC3_NUM_SRATE][4];
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extern const float *lc3_ltpf_cden[LC3_NUM_SRATE][4];
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/**
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* Spectral Data Arithmetic Coding
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*/
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extern const uint8_t lc3_spectrum_lookup[2][2][256][4];
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extern const struct lc3_ac_model lc3_spectrum_models[];
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extern const uint16_t lc3_spectrum_bits[][17];
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#endif /* __LC3_TABLES_H */
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