FreeCalypso > hg > gsm-codec-lib
view libtwamr/cnst.h @ 477:4c9222d95647
libtwamr encoder: always emit frame->mode = mode;
In the original implementation of amr_encode_frame(), the 'mode' member
of the output struct was set to 0xFF if the output frame type is TX_NO_DATA.
This design was made to mimic the mode field (16-bit word) being set to
0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends
on this struct member being set in any way, and amr_frame_to_tseq()
generates the needed 0xFFFF on its own, based on frame->type being equal
to TX_NO_DATA.
It is simpler and more efficient to always set frame->mode to the actual
encoding mode in amr_encode_frame(), and this new behavior has already
been documented in doc/AMR-library-API description in anticipation of
the present change.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sat, 18 May 2024 22:30:42 +0000 |
| parents | 57b4053559ff |
| children |
line wrap: on
line source
/* ***************************************************************************** * * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001 * R99 Version 3.3.0 * REL-4 Version 4.1.0 * ***************************************************************************** * * File : cnst.h * Purpose : Speech codec constant parameters * : (encoder, decoder, and postfilter) * ***************************************************************************** */ #ifndef cnst_h #define cnst_h "$Id $" #define L_TOTAL 320 /* Total size of speech buffer. */ #define L_WINDOW 240 /* Window size in LP analysis */ #define L_FRAME 160 /* Frame size */ #define L_FRAME_BY2 80 /* Frame size divided by 2 */ #define L_SUBFR 40 /* Subframe size */ #define L_CODE 40 /* codevector length */ #define NB_TRACK 5 /* number of tracks */ #define STEP 5 /* codebook step size */ #define NB_TRACK_MR102 4 /* number of tracks mode mr102 */ #define STEP_MR102 4 /* codebook step size mode mr102 */ #define M 10 /* Order of LP filter */ #define MP1 (M+1) /* Order of LP filter + 1 */ #define LSF_GAP 205 /* Minimum distance between LSF after quan- tization; 50 Hz = 205 */ #define LSP_PRED_FAC_MR122 21299 /* MR122 LSP prediction factor (0.65 Q15) */ #define AZ_SIZE (4*M+4) /* Size of array of LP filters in 4 subfr.s */ #define PIT_MIN_MR122 18 /* Minimum pitch lag (MR122 mode) */ #define PIT_MIN 20 /* Minimum pitch lag (all other modes) */ #define PIT_MAX 143 /* Maximum pitch lag */ #define L_INTERPOL (10+1) /* Length of filter for interpolation */ #define L_INTER_SRCH 4 /* Length of filter for CL LTP search interpolation */ #define MU 26214 /* Factor for tilt compensation filter 0.8 */ #define AGC_FAC 29491 /* Factor for automatic gain control 0.9 */ #define L_NEXT 40 /* Overhead in LP analysis */ #define SHARPMAX 13017 /* Maximum value of pitch sharpening */ #define SHARPMIN 0 /* Minimum value of pitch sharpening */ #define MAX_PRM_SIZE 57 /* max. num. of params */ #define MAX_SERIAL_SIZE 244 /* max. num. of serial bits */ #define GP_CLIP 15565 /* Pitch gain clipping = 0.95 */ #define N_FRAME 7 /* old pitch gains in average calculation */ #define EHF_MASK 0x0008 /* encoder homing frame pattern */ #endif