FreeCalypso > hg > gsm-codec-lib
diff libtwamr/c4_17pf.h @ 322:fc82b113977f
libtwamr: integrate c4_17pf.c
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Thu, 18 Apr 2024 19:41:41 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libtwamr/c4_17pf.h Thu Apr 18 19:41:41 2024 +0000 @@ -0,0 +1,75 @@ +/* +******************************************************************************** +* +* 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 : c4_17pf.h +* Purpose : Searches a 17 bit algebraic codebook containing 4 pulses +* in a frame of 40 samples. +* +******************************************************************************** +*/ +#ifndef c4_17pf_h +#define c4_17pf_h "$Id $" + +/* +******************************************************************************** +* INCLUDE FILES +******************************************************************************** +*/ +#include "typedef.h" + +/* +******************************************************************************** +* LOCAL VARIABLES AND TABLES +******************************************************************************** +*/ + +/* +******************************************************************************** +* DEFINITION OF DATA TYPES +******************************************************************************** +*/ + +/* +******************************************************************************** +* DECLARATION OF PROTOTYPES +******************************************************************************** +*/ +/************************************************************************* + * + * FUNCTION: code_4i40_17bits() + * + * PURPOSE: Searches a 17 bit algebraic codebook containing 4 pulses + * in a frame of 40 samples. + * + * DESCRIPTION: + * The code length is 40, containing 4 nonzero pulses: i0...i3. + * All pulses can have two possible amplitudes: +1 or -1. + * Pulse i0 to i2 can have 8 possible positions, pulse i3 can have + * 2x8=16 positions. + * + * i0 : 0, 5, 10, 15, 20, 25, 30, 35. + * i1 : 1, 6, 11, 16, 21, 26, 31, 36. + * i2 : 2, 7, 12, 17, 22, 27, 32, 37. + * i3 : 3, 8, 13, 18, 23, 28, 33, 38. + * 4, 9, 14, 19, 24, 29, 34, 39. + * + *************************************************************************/ + +Word16 code_4i40_17bits( + 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 4 pulses */ +); + +#endif