FreeCalypso > hg > gsm-codec-lib
view libgsmefr/enc_main.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 | 035424a6ca83 |
children |
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/* * This module contains our GSM EFR encoder main function, EFR_encode_params(), * that stands at the boundary between our public interface and the guts of * ETSI-based codec. */ #include "gsm_efr.h" #include "typedef.h" #include "namespace.h" #include "basic_op.h" #include "cnst.h" #include "codec.h" #include "sig_proc.h" #include "memops.h" #include "enc_state.h" #include "e_homing.h" #include "dtx.h" void EFR_encode_params(struct EFR_encoder_state *st, const int16_t *pcm_in, int16_t *params, int *sp_out, int *vad_out) { Word16 *new_speech = st->old_speech + L_TOTAL - L_FRAME; Word16 syn[L_FRAME]; Word16 reset_flag; Word16 i; /* Check whether this frame is an encoder homing frame */ reset_flag = encoder_homing_frame_test (pcm_in); for (i = 0; i < L_FRAME; i++) /* Delete the 3 LSBs (13-bit input) */ { new_speech[i] = pcm_in[i] & 0xfff8; } Pre_Process (st, new_speech, L_FRAME); /* filter + downscaling */ Coder_12k2 (st, params, syn); /* Find speech parameters */ if ((st->txdtx_ctrl & TX_SP_FLAG) == 0) { /* Write comfort noise parameters into the parameter frame. Use old parameters in case SID frame is not to be updated */ CN_encoding (st, params, st->txdtx_ctrl); } /* VAD and SP flag outputs */ if (vad_out) *vad_out = ((st->txdtx_ctrl & TX_VAD_FLAG) != 0); if (sp_out) *sp_out = ((st->txdtx_ctrl & TX_SP_FLAG) != 0); if (reset_flag != 0) { /* Bring the encoder, VAD and DTX to the home state */ EFR_encoder_reset(st, st->dtx_mode); } }