FreeCalypso > hg > gsm-codec-lib
view libtwamr/hp_max.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 | 176a44ff94a1 |
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 : hp_max.h * Purpose : Find the maximum correlation of scal_sig[] in a given * delay range. * ******************************************************************************** */ #ifndef hp_max_h #define hp_max_h "$Id $" /* ******************************************************************************** * INCLUDE FILES ******************************************************************************** */ #include "typedef.h" /* ******************************************************************************** * DECLARATION OF PROTOTYPES ******************************************************************************** */ /************************************************************************* * * FUNCTION: hp_max * * PURPOSE: Find the maximum high-pass filtered correlation of * signal scal_sig[] in a given delay range. * * DESCRIPTION: * The correlation is given by * corr[t] = <scal_sig[n],scal_sig[n-t]>, t=lag_min,...,lag_max * The functions outputs the maximum high-pass filtered correlation * after normalization. * *************************************************************************/ Word16 hp_max ( Word32 corr[], /* i : correlation vector. */ Word16 scal_sig[], /* i : scaled signal. */ Word16 L_frame, /* i : length of frame to compute pitch */ Word16 lag_max, /* i : maximum lag */ Word16 lag_min, /* i : minimum lag */ Word16 *cor_hp_max /* o : max high-pass filtered norm. correlation */ ); #endif