FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/q_plsf5_tab.h @ 242:f081a6850fb5
libgsmfrp: new refined implementation
The previous implementation exhibited the following defects,
which are now fixed:
1) The last received valid SID was cached forever for the purpose of
handling future invalid SIDs - we could have received some valid
SID ages ago, then lots of speech or NO_DATA, and if we then get
an invalid SID, we would resurrect the last valid SID from ancient
history - a bad design. In our new design, we handle invalid SID
based on the current state, much like BFI.
2) GSM 06.11 spec says clearly that after the second lost SID
(received BFI=1 && TAF=1 in CN state) we need to gradually decrease
the output level, rather than jump directly to emitting silence
frames - we previously failed to implement such logic.
3) Per GSM 06.12 section 5.2, Xmaxc should be the same in all 4 subframes
in a SID frame. What should we do if we receive an otherwise valid
SID frame with different Xmaxc? Our previous approach would
replicate this Xmaxc oddity in every subsequent generated CN frame,
which is rather bad. In our new design, the very first CN frame
(which can be seen as a transformation of the SID frame itself)
retains the original 4 distinct Xmaxc, but all subsequent CN frames
are based on the Xmaxc from the last subframe of the most recent SID.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 09 May 2023 05:16:31 +0000 |
parents | cc08498ed21b |
children |
rev | line source |
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cc08498ed21b
libgsmefr: factor out q_plsf_5 tables into their own C module
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parents:
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1 /* |
cc08498ed21b
libgsmefr: factor out q_plsf_5 tables into their own C module
Mychaela Falconia <falcon@freecalypso.org>
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2 * The original ETSI EFR code features an include file named q_plsf_5.tab, |
cc08498ed21b
libgsmefr: factor out q_plsf_5 tables into their own C module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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3 * included into d_homing.c, d_plsf_5.c and q_plsf_5.c, duplicating |
cc08498ed21b
libgsmefr: factor out q_plsf_5 tables into their own C module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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4 * the small mean_lsf[] table across all 3 modules and the other (big) |
cc08498ed21b
libgsmefr: factor out q_plsf_5 tables into their own C module
Mychaela Falconia <falcon@freecalypso.org>
parents:
41
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5 * tables across d_plsf_5.c for the decoder and q_plsf_5.c for the encoder. |
cc08498ed21b
libgsmefr: factor out q_plsf_5 tables into their own C module
Mychaela Falconia <falcon@freecalypso.org>
parents:
41
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6 * |
cc08498ed21b
libgsmefr: factor out q_plsf_5 tables into their own C module
Mychaela Falconia <falcon@freecalypso.org>
parents:
41
diff
changeset
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7 * In our version we have moved the tables into q_plsf5_tab.c, |
cc08498ed21b
libgsmefr: factor out q_plsf_5 tables into their own C module
Mychaela Falconia <falcon@freecalypso.org>
parents:
41
diff
changeset
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8 * with extern declarations in q_plsf5_tab.h. |
cc08498ed21b
libgsmefr: factor out q_plsf_5 tables into their own C module
Mychaela Falconia <falcon@freecalypso.org>
parents:
41
diff
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9 */ |
41
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libgsmefr/*.tab: import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
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10 |
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11 extern const Word16 mean_lsf[10]; |
41
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12 |
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13 #define DICO1_SIZE 128 |
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14 #define DICO2_SIZE 256 |
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15 #define DICO3_SIZE 256 |
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16 #define DICO4_SIZE 256 |
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17 #define DICO5_SIZE 64 |
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18 |
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19 extern const Word16 dico1_lsf[DICO1_SIZE * 4]; |
cc08498ed21b
libgsmefr: factor out q_plsf_5 tables into their own C module
Mychaela Falconia <falcon@freecalypso.org>
parents:
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20 extern const Word16 dico2_lsf[DICO2_SIZE * 4]; |
cc08498ed21b
libgsmefr: factor out q_plsf_5 tables into their own C module
Mychaela Falconia <falcon@freecalypso.org>
parents:
41
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21 extern const Word16 dico3_lsf[DICO3_SIZE * 4]; |
cc08498ed21b
libgsmefr: factor out q_plsf_5 tables into their own C module
Mychaela Falconia <falcon@freecalypso.org>
parents:
41
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22 extern const Word16 dico4_lsf[DICO4_SIZE * 4]; |
cc08498ed21b
libgsmefr: factor out q_plsf_5 tables into their own C module
Mychaela Falconia <falcon@freecalypso.org>
parents:
41
diff
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23 extern const Word16 dico5_lsf[DICO5_SIZE * 4]; |