FreeCalypso > hg > gsm-codec-lib
diff libtwamr/c2_11pf.h @ 319:9bca350be398
libtwamr: integrate c2_11pf.c
| author | Mychaela Falconia <falcon@freecalypso.org> |
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| date | Thu, 18 Apr 2024 19:23:20 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libtwamr/c2_11pf.h Thu Apr 18 19:23:20 2024 +0000 @@ -0,0 +1,76 @@ +/* +******************************************************************************** +* +* 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 : c2_11pf.h +* Purpose : Searches a 11 bit algebraic codebook containing 2 pulses +* in a frame of 40 samples. +* +******************************************************************************** +*/ +#ifndef c2_11pf_h +#define c2_11pf_h "$Id $" + +/* +******************************************************************************** +* INCLUDE FILES +******************************************************************************** +*/ +#include "typedef.h" + +/* +******************************************************************************** +* LOCAL VARIABLES AND TABLES +******************************************************************************** +*/ + +/* +******************************************************************************** +* DEFINITION OF DATA TYPES +******************************************************************************** +*/ + +/* +******************************************************************************** +* DECLARATION OF PROTOTYPES +******************************************************************************** +*/ +/************************************************************************* + * + * FUNCTION: code_2i40_11bits() + * + * PURPOSE: Searches a 11 bit algebraic codebook containing 2 pulses + * in a frame of 40 samples. + * + * DESCRIPTION: + * The code length is 40, containing 2 nonzero pulses: i0...i1. + * All pulses can have two possible amplitudes: +1 or -1. + * Pulse i0 can have 2x8=16 possible positions, pulse i1 can have + * 4x8=32 positions. + * + * i0 : 1, 6, 11, 16, 21, 26, 31, 36. + * 3, 8, 13, 18, 23, 28, 33, 38. + * i1 : 0, 5, 10, 15, 20, 25, 30, 35. + * 1, 6, 11, 16, 21, 26, 31, 36. + * 2, 7, 12, 17, 22, 27, 32, 37. + * 4, 9, 14, 19, 24, 29, 34, 39. + * + *************************************************************************/ + +Word16 code_2i40_11bits( + Word16 x[], /* i : target vector */ + Word16 h[], /* i : impulse response of weighted synthesis filter */ + /* h[-L_subfr..-1] must be set to zero. */ + Word16 T0, /* i : Pitch lag */ + Word16 pitch_sharp, /* i : Last quantized pitch gain */ + Word16 code[], /* o : Innovative codebook */ + Word16 y[], /* o : filtered fixed codebook excitation */ + Word16 * sign /* o : Signs of 2 pulses */ +); + +#endif