FreeCalypso > hg > gsm-codec-lib
view libtwamr/sid_sync.c @ 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 | a8b73b1c5b19 |
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 : sid_sync.c * ***************************************************************************** */ /* ***************************************************************************** * MODULE INCLUDE FILE AND VERSION ID ***************************************************************************** */ #include "namespace.h" #include "sid_sync.h" /* ***************************************************************************** * INCLUDE FILES ***************************************************************************** */ #include "tw_amr.h" #include "typedef.h" #include "basic_op.h" #include "no_count.h" /* ***************************************************************************** * LOCAL VARIABLES AND TABLES ***************************************************************************** */ /* ***************************************************************************** * PUBLIC PROGRAM CODE ***************************************************************************** */ void sid_sync_reset (sid_syncState *st) { st->sid_update_rate = 8; st->sid_update_counter = 3; st->sid_handover_debt = 0; st->prev_ft = TX_SPEECH_GOOD; } int sid_sync_set_handover_debt (sid_syncState *st, Word16 debtFrames) { /* debtFrames >= 0 */ st->sid_handover_debt = debtFrames; return 0; } void sid_sync (sid_syncState *st, enum Mode mode, enum TXFrameType *tx_frame_type) { if (mode == MRDTX) { st->sid_update_counter--; if (st->prev_ft == TX_SPEECH_GOOD) { *tx_frame_type = TX_SID_FIRST; st->sid_update_counter = 3; } else { /* TX_SID_UPDATE or TX_NO_DATA */ if ((st->sid_handover_debt > 0) && (st->sid_update_counter > 2) ) { /* ensure extra updates are properly delayed after a possible SID_FIRST */ *tx_frame_type = TX_SID_UPDATE; st->sid_handover_debt--; } else { if (st->sid_update_counter == 0) { *tx_frame_type = TX_SID_UPDATE; st->sid_update_counter = st->sid_update_rate; } else { *tx_frame_type = TX_NO_DATA; } } } } else { st->sid_update_counter = st->sid_update_rate ; *tx_frame_type = TX_SPEECH_GOOD; } st->prev_ft = *tx_frame_type; }