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view libgsmhr1/dtx_dec.h @ 605:63f774192906

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gsmhr_decoder_twts002_in(): set BFI=1 SID=1 for invalid SID When a received TW-TS-002 RTP payload indicates invalid SID, which of the 3 possible BFI/SID combinations should we pass to our internal ETSI-based speech decoder or TFO engine? Our original code passed BFI=0 SID=1, but upon further reflection, BFI=1 SID=1 is a better choice. In the corner case where received invalid SID is fed to a full decoder in homed state, setting BFI=1 allows that decoder to emit zeros on PCM and stay homed, instead of launching into full decoding.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 21:01:46 +0000
parents c7c03231002d
children
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#ifndef __DTX_DEC
#define __DTX_DEC

#include "typedefs.h"
#include "tw_gsmhr.h"

/*________________________________________________________________________
 |                                                                        |
 |                      Function Prototypes                               |
 |________________________________________________________________________|
*/

Longword linInterpSid(Longword L_New, Longword L_Old, Shortword swDtxState);

Shortword linInterpSidShort(Shortword swNew, Shortword swOld,
			    Shortword swDtxState);

void Init_CN_interpolation(struct gsmhr_decoder_state *st, Shortword deco_mode,
			   const Shortword *pswNewKs);

Shortword CN_Interpolate_R0(struct gsmhr_decoder_state *st, Shortword new_R0);

void CN_Interpolate_LPC(struct gsmhr_decoder_state *st, Shortword *pswNewKs);

#endif