FreeCalypso > hg > gsm-codec-lib
view libtwamr/qua_gain.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 | b02e043dcba0 |
| children |
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/* ******************************************************************************** * * 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 : qua_gain.h * Purpose : Quantization of pitch and codebook gains. * ******************************************************************************** */ #ifndef qua_gain_h #define qua_gain_h "$Id $" /* ******************************************************************************** * INCLUDE FILES ******************************************************************************** */ #include "tw_amr.h" #include "typedef.h" /* ******************************************************************************** * DECLARATION OF PROTOTYPES ******************************************************************************** */ /************************************************************************* * * FUNCTION: Qua_gain() * * PURPOSE: Quantization of pitch and codebook gains. * (using predicted codebook gain) * *************************************************************************/ Word16 Qua_gain( /* o : index of quantization. */ enum Mode mode, /* i : AMR mode */ Word16 exp_gcode0, /* i : predicted CB gain (exponent), Q0 */ Word16 frac_gcode0, /* i : predicted CB gain (fraction), Q15 */ Word16 frac_coeff[], /* i : energy coeff. (5), fraction part, Q15 */ Word16 exp_coeff[], /* i : energy coeff. (5), exponent part, Q0 */ /* (frac_coeff and exp_coeff computed in */ /* calc_filt_energies()) */ Word16 gp_limit, /* i : pitch gain limit */ Word16 *gain_pit, /* o : Pitch gain, Q14 */ Word16 *gain_cod, /* o : Code gain, Q1 */ Word16 *qua_ener_MR122, /* o : quantized energy error, Q10 */ /* (for MR122 MA predictor update) */ Word16 *qua_ener /* o : quantized energy error, Q10 */ /* (for other MA predictor update) */ ); #endif