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feature: Add High-Resolution LC3 plus mode

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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
This commit is contained in:
Antoine Soulier
2023-12-21 15:42:08 -08:00
parent 149cb6537e
commit daa580235e
46 changed files with 4518 additions and 1149 deletions
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68
src/tables.h
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@@ -23,6 +23,72 @@
#include "bits.h"
/**
* Characteristics
*
* ns Number of temporal samples / frequency coefficients within a frame
*
* ne Number of encoded frequency coefficients
*
* nd Number of MDCT delayed samples, sum of half a frame and an ovelap
* of future by 1.25 ms (2.5ms, 5ms and 10ms frame durations),
* or 2 ms (7.5ms frame duration).
*
* nh Number of 18 ms samples of the history buffer, aligned on a frame
*
* nt Number of 1.25 ms previous samples
*/
extern const int lc3_ns_2m5[LC3_NUM_SRATE];
extern const int lc3_ne_2m5[LC3_NUM_SRATE];
extern const int lc3_ns_4m [LC3_NUM_SRATE];
static inline int lc3_ns(enum lc3_dt dt, enum lc3_srate sr) {
return lc3_ns_2m5[sr] * (1 + dt);
}
static inline int lc3_ne(enum lc3_dt dt, enum lc3_srate sr) {
return lc3_ne_2m5[sr] * (1 + dt);
}
static inline int lc3_nd(enum lc3_dt dt, enum lc3_srate sr) {
return ( lc3_ns(dt, sr) +
(dt == LC3_DT_7M5 ? lc3_ns_4m[sr] : lc3_ns_2m5[sr]) ) >> 1;
}
static inline int lc3_nh(enum lc3_dt dt, enum lc3_srate sr) {
return sr > LC3_SRATE_48K_HR ? 0 :
(8 + (dt == LC3_DT_7M5)) * lc3_ns_2m5[sr];
}
static inline int lc3_nt(enum lc3_srate sr) {
return lc3_ns_2m5[sr] >> 1;
}
#define LC3_MAX_SRATE_HZ ( LC3_PLUS_HR ? 96000 : 48000 )
#define LC3_MAX_NS ( LC3_NS(10000, LC3_MAX_SRATE_HZ) )
#define LC3_MAX_NE ( LC3_PLUS_HR ? LC3_MAX_NS : LC3_NS(10000, 40000) )
/**
* Limits on size of frame
*/
extern const int lc3_frame_bytes_hr_lim
[LC3_NUM_DT][LC3_NUM_SRATE - LC3_SRATE_48K_HR][2];
static inline int lc3_min_frame_bytes(enum lc3_dt dt, enum lc3_srate sr) {
return !lc3_hr(sr) ? LC3_MIN_FRAME_BYTES :
lc3_frame_bytes_hr_lim[dt][sr - LC3_SRATE_48K_HR][0];
}
static inline int lc3_max_frame_bytes(enum lc3_dt dt, enum lc3_srate sr) {
return !lc3_hr(sr) ? LC3_MAX_FRAME_BYTES :
lc3_frame_bytes_hr_lim[dt][sr - LC3_SRATE_48K_HR][1];
}
/**
* MDCT Twiddles and window coefficients
*/
@@ -45,7 +111,7 @@ extern const float *lc3_mdct_win[LC3_NUM_DT][LC3_NUM_SRATE];
#define LC3_MAX_BANDS 64
extern const int lc3_num_bands[LC3_NUM_DT][LC3_NUM_SRATE];
extern const uint16_t *lc3_band_lim[LC3_NUM_DT][LC3_NUM_SRATE];
extern const int *lc3_band_lim[LC3_NUM_DT][LC3_NUM_SRATE];
/**