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annotate libgsmefr/basic_op.h @ 183:452c1d5a6268

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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 38326102fc43
children 1c514150c033
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1 /*___________________________________________________________________________
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2 | |
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3 | Constants and Globals |
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4 |___________________________________________________________________________|
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5 */
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6 extern __thread Flag Overflow;
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7 extern __thread Flag Carry;
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9 #define MAX_32 (Word32)0x7fffffffL
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10 #define MIN_32 (Word32)0x80000000L
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12 #define MAX_16 (Word16)0x7fff
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13 #define MIN_16 (Word16)0x8000
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15 /*___________________________________________________________________________
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16 | |
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17 | Prototypes for basic arithmetic operators |
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18 |___________________________________________________________________________|
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19 */
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21 Word16 add (Word16 var1, Word16 var2); /* Short add, 1 */
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22 Word16 sub (Word16 var1, Word16 var2); /* Short sub, 1 */
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23 Word16 abs_s (Word16 var1); /* Short abs, 1 */
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24 Word16 shl (Word16 var1, Word16 var2); /* Short shift left, 1 */
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25 Word16 shr (Word16 var1, Word16 var2); /* Short shift right, 1 */
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26 Word16 mult (Word16 var1, Word16 var2); /* Short mult, 1 */
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27 Word32 L_mult (Word16 var1, Word16 var2); /* Long mult, 1 */
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28 Word16 negate (Word16 var1); /* Short negate, 1 */
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29 Word16 extract_h (Word32 L_var1); /* Extract high, 1 */
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30 Word16 extract_l (Word32 L_var1); /* Extract low, 1 */
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31 Word16 round (Word32 L_var1); /* Round, 1 */
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32 Word32 L_mac (Word32 L_var3, Word16 var1, Word16 var2); /* Mac, 1 */
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33 Word32 L_msu (Word32 L_var3, Word16 var1, Word16 var2); /* Msu, 1 */
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34 Word32 L_macNs (Word32 L_var3, Word16 var1, Word16 var2); /* Mac without
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35 sat, 1 */
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36 Word32 L_msuNs (Word32 L_var3, Word16 var1, Word16 var2); /* Msu without
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37 sat, 1 */
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38 Word32 L_add (Word32 L_var1, Word32 L_var2); /* Long add, 2 */
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39 Word32 L_sub (Word32 L_var1, Word32 L_var2); /* Long sub, 2 */
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40 Word32 L_add_c (Word32 L_var1, Word32 L_var2); /* Long add with c, 2 */
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41 Word32 L_sub_c (Word32 L_var1, Word32 L_var2); /* Long sub with c, 2 */
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42 Word32 L_negate (Word32 L_var1); /* Long negate, 2 */
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43 Word16 mult_r (Word16 var1, Word16 var2); /* Mult with round, 2 */
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44 Word32 L_shl (Word32 L_var1, Word16 var2); /* Long shift left, 2 */
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45 Word32 L_shr (Word32 L_var1, Word16 var2); /* Long shift right, 2*/
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46 Word16 shr_r (Word16 var1, Word16 var2); /* Shift right with
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47 round, 2 */
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48 Word16 mac_r (Word32 L_var3, Word16 var1, Word16 var2); /* Mac with
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49 rounding,2 */
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50 Word16 msu_r (Word32 L_var3, Word16 var1, Word16 var2); /* Msu with
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51 rounding,2 */
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52 Word32 L_deposit_h (Word16 var1); /* 16 bit var1 -> MSB, 2 */
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53 Word32 L_deposit_l (Word16 var1); /* 16 bit var1 -> LSB, 2 */
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55 Word32 L_shr_r (Word32 L_var1, Word16 var2); /* Long shift right with
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56 round, 3 */
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57 Word32 L_abs (Word32 L_var1); /* Long abs, 3 */
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58 Word32 L_sat (Word32 L_var1); /* Long saturation, 4 */
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59 Word16 norm_s (Word16 var1); /* Short norm, 15 */
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60 Word16 div_s (Word16 var1, Word16 var2); /* Short division, 18 */
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61 Word16 norm_l (Word32 L_var1); /* Long norm, 30 */
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