FreeCalypso > hg > gsm-codec-lib
changeset 183:452c1d5a6268
libgsmefr BFI w/o data: emit zero output after decoder reset
In real-life usage, each EFR decoder session will most likely begin
with lots of BFI frames before the first real frame arrives. However,
because the spec-defined home state of the decoder is speech rather
than CN, our regular logic for BFI w/o data would have to feed
pseudorandom noise to the decoder (in the "fixed codebook excitation
pulses" part), which is silly to do at the beginning of the decoder
session right out of reset. Therefore, let's check reset_flag_old,
and if we are still in the reset state, simply emit zero output.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Tue, 03 Jan 2023 00:12:18 +0000 |
| parents | 2254fa16ec5f |
| children | b092a510141e |
| files | libgsmefr/bfi_nodata.c |
| diffstat | 1 files changed, 4 insertions(+), 0 deletions(-) [+] |
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--- a/libgsmefr/bfi_nodata.c Mon Jan 02 23:05:38 2023 +0000 +++ b/libgsmefr/bfi_nodata.c Tue Jan 03 00:12:18 2023 +0000 @@ -46,6 +46,10 @@ { int16_t params[EFR_NUM_PARAMS]; + if (st->reset_flag_old) { + memset(pcm_out, 0, sizeof(int16_t) * L_FRAME); + return; + } memset(params, 0, sizeof(int16_t) * EFR_NUM_PARAMS); if (st->rxdtx_ctrl & RX_SP_FLAG) random_bad_frame(st, params);