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Diffstat (limited to 'trunk/codecs/lpc10/lpcdec.c')
-rw-r--r-- | trunk/codecs/lpc10/lpcdec.c | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/trunk/codecs/lpc10/lpcdec.c b/trunk/codecs/lpc10/lpcdec.c new file mode 100644 index 000000000..dd859ffce --- /dev/null +++ b/trunk/codecs/lpc10/lpcdec.c @@ -0,0 +1,297 @@ +/* + +$Log$ +Revision 1.15 2004/06/26 03:50:14 markster +Merge source cleanups (bug #1911) + +Revision 1.14 2003/02/12 13:59:15 matteo +mer feb 12 14:56:57 CET 2003 + +Revision 1.1.1.1 2003/02/12 13:59:15 matteo +mer feb 12 14:56:57 CET 2003 + +Revision 1.2 2000/01/05 08:20:39 markster +Some OSS fixes and a few lpc changes to make it actually work + + * Revision 1.2 1996/08/20 20:30:11 jaf + * Removed all static local variables that were SAVE'd in the Fortran + * code, and put them in struct lpc10_encoder_state that is passed as an + * argument. + * + * Removed init function, since all initialization is now done in + * init_lpc10_encoder_state(). + * + * Changed name of function from lpcenc_ to lpc10_encode, simply to make + * all lpc10 functions have more consistent naming with each other. + * + * Revision 1.1 1996/08/19 22:31:48 jaf + * Initial revision + * + +*/ + +/* -- translated by f2c (version 19951025). + You must link the resulting object file with the libraries: + -lf2c -lm (in that order) +*/ + +#include "f2c.h" + +#ifdef P_R_O_T_O_T_Y_P_E_S +extern int lpcdec_(integer *bits, real *speech); +extern int initlpcdec_(void); +/* comlen contrl_ 12 */ +/*:ref: chanrd_ 14 5 4 4 4 4 4 */ +/*:ref: decode_ 14 7 4 4 4 4 4 6 6 */ +/*:ref: synths_ 14 6 4 4 6 6 6 4 */ +/*:ref: initdecode_ 14 0 */ +/*:ref: initsynths_ 14 0 */ +#endif + +/* Common Block Declarations */ + +extern struct { + integer order, lframe; + logical corrp; +} contrl_; + +#define contrl_1 contrl_ + +/* Table of constant values */ + +static integer c__10 = 10; + +/* ***************************************************************** */ + +/* $Log$ + * Revision 1.15 2004/06/26 03:50:14 markster + * Merge source cleanups (bug #1911) + * + * Revision 1.14 2003/02/12 13:59:15 matteo + * mer feb 12 14:56:57 CET 2003 + * + * Revision 1.1.1.1 2003/02/12 13:59:15 matteo + * mer feb 12 14:56:57 CET 2003 + * + * Revision 1.2 2000/01/05 08:20:39 markster + * Some OSS fixes and a few lpc changes to make it actually work + * + * Revision 1.2 1996/08/20 20:30:11 jaf + * Removed all static local variables that were SAVE'd in the Fortran + * code, and put them in struct lpc10_encoder_state that is passed as an + * argument. + * + * Removed init function, since all initialization is now done in + * init_lpc10_encoder_state(). + * + * Changed name of function from lpcenc_ to lpc10_encode, simply to make + * all lpc10 functions have more consistent naming with each other. + * + * Revision 1.1 1996/08/19 22:31:48 jaf + * Initial revision + * */ +/* Revision 1.1 1996/03/28 00:03:00 jaf */ +/* Initial revision */ + + +/* ***************************************************************** */ + +/* Decode 54 bits to one frame of 180 speech samples. */ + +/* Input: */ +/* BITS - 54 encoded bits, stored 1 per array element. */ +/* Indices 1 through 53 read (SYNC bit ignored). */ +/* Output: */ +/* SPEECH - Speech encoded as real values in the range [-1,+1]. */ +/* Indices 1 through 180 written. */ + +/* This subroutine maintains local state from one call to the next. If */ +/* you want to switch to using a new audio stream for this filter, or */ +/* reinitialize its state for any other reason, call the ENTRY */ +/* INITLPCDEC. */ + +/* Subroutine */ int lpc10_decode(integer *bits, real *speech, + struct lpc10_decoder_state *st) +{ + integer irms, voice[2], pitch, ipitv; + extern /* Subroutine */ int decode_(integer *, integer *, integer *, + integer *, integer *, real *, real *, struct lpc10_decoder_state *); + real rc[10]; + extern /* Subroutine */ int chanrd_(integer *, integer *, integer *, + integer *, integer *), synths_(integer *, + integer *, real *, real *, real *, integer *, + struct lpc10_decoder_state *); + integer irc[10], len; + real rms; + +/* $Log$ + * Revision 1.15 2004/06/26 03:50:14 markster + * Merge source cleanups (bug #1911) + * + * Revision 1.14 2003/02/12 13:59:15 matteo + * mer feb 12 14:56:57 CET 2003 + * + * Revision 1.1.1.1 2003/02/12 13:59:15 matteo + * mer feb 12 14:56:57 CET 2003 + * + * Revision 1.2 2000/01/05 08:20:39 markster + * Some OSS fixes and a few lpc changes to make it actually work + * + * Revision 1.2 1996/08/20 20:30:11 jaf + * Removed all static local variables that were SAVE'd in the Fortran + * code, and put them in struct lpc10_encoder_state that is passed as an + * argument. + * + * Removed init function, since all initialization is now done in + * init_lpc10_encoder_state(). + * + * Changed name of function from lpcenc_ to lpc10_encode, simply to make + * all lpc10 functions have more consistent naming with each other. + * + * Revision 1.1 1996/08/19 22:31:48 jaf + * Initial revision + * */ +/* Revision 1.3 1996/03/29 22:03:47 jaf */ +/* Removed definitions for any constants that were no longer used. */ + +/* Revision 1.2 1996/03/26 19:34:33 jaf */ +/* Added comments indicating which constants are not needed in an */ +/* application that uses the LPC-10 coder. */ + +/* Revision 1.1 1996/02/07 14:43:51 jaf */ +/* Initial revision */ + +/* LPC Configuration parameters: */ +/* Frame size, Prediction order, Pitch period */ +/* Arguments */ +/* $Log$ + * Revision 1.15 2004/06/26 03:50:14 markster + * Merge source cleanups (bug #1911) + * + * Revision 1.14 2003/02/12 13:59:15 matteo + * mer feb 12 14:56:57 CET 2003 + * + * Revision 1.1.1.1 2003/02/12 13:59:15 matteo + * mer feb 12 14:56:57 CET 2003 + * + * Revision 1.2 2000/01/05 08:20:39 markster + * Some OSS fixes and a few lpc changes to make it actually work + * + * Revision 1.2 1996/08/20 20:30:11 jaf + * Removed all static local variables that were SAVE'd in the Fortran + * code, and put them in struct lpc10_encoder_state that is passed as an + * argument. + * + * Removed init function, since all initialization is now done in + * init_lpc10_encoder_state(). + * + * Changed name of function from lpcenc_ to lpc10_encode, simply to make + * all lpc10 functions have more consistent naming with each other. + * + * Revision 1.1 1996/08/19 22:31:48 jaf + * Initial revision + * */ +/* Revision 1.3 1996/03/29 22:05:55 jaf */ +/* Commented out the common block variables that are not needed by the */ +/* embedded version. */ + +/* Revision 1.2 1996/03/26 19:34:50 jaf */ +/* Added comments indicating which constants are not needed in an */ +/* application that uses the LPC-10 coder. */ + +/* Revision 1.1 1996/02/07 14:44:09 jaf */ +/* Initial revision */ + +/* LPC Processing control variables: */ + +/* *** Read-only: initialized in setup */ + +/* Files for Speech, Parameter, and Bitstream Input & Output, */ +/* and message and debug outputs. */ + +/* Here are the only files which use these variables: */ + +/* lpcsim.f setup.f trans.f error.f vqsetup.f */ + +/* Many files which use fdebug are not listed, since it is only used in */ +/* those other files conditionally, to print trace statements. */ +/* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */ +/* LPC order, Frame size, Quantization rate, Bits per frame, */ +/* Error correction */ +/* Subroutine SETUP is the only place where order is assigned a value, */ +/* and that value is 10. It could increase efficiency 1% or so to */ +/* declare order as a constant (i.e., a Fortran PARAMETER) instead of as +*/ +/* a variable in a COMMON block, since it is used in many places in the */ +/* core of the coding and decoding routines. Actually, I take that back. +*/ +/* At least when compiling with f2c, the upper bound of DO loops is */ +/* stored in a local variable before the DO loop begins, and then that is +*/ +/* compared against on each iteration. */ +/* Similarly for lframe, which is given a value of MAXFRM in SETUP. */ +/* Similarly for quant, which is given a value of 2400 in SETUP. quant */ +/* is used in only a few places, and never in the core coding and */ +/* decoding routines, so it could be eliminated entirely. */ +/* nbits is similar to quant, and is given a value of 54 in SETUP. */ +/* corrp is given a value of .TRUE. in SETUP, and is only used in the */ +/* subroutines ENCODE and DECODE. It doesn't affect the speed of the */ +/* coder significantly whether it is .TRUE. or .FALSE., or whether it is +*/ +/* a constant or a variable, since it is only examined once per frame. */ +/* Leaving it as a variable that is set to .TRUE. seems like a good */ +/* idea, since it does enable some error-correction capability for */ +/* unvoiced frames, with no change in the coding rate, and no noticeable +*/ +/* quality difference in the decoded speech. */ +/* integer quant, nbits */ +/* *** Read/write: variables for debugging, not needed for LPC algorithm +*/ + +/* Current frame, Unstable frames, Output clip count, Max onset buffer, +*/ +/* Debug listing detail level, Line count on listing page */ + +/* nframe is not needed for an embedded LPC10 at all. */ +/* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */ +/* ERROR, which is only called from RCCHK. When LPC10 is embedded into */ +/* an application, I would recommend removing the call to ERROR in RCCHK, +*/ +/* and remove ERROR and nunsfm completely. */ +/* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in +*/ +/* sread.f. When LPC10 is embedded into an application, one might want */ +/* to cause it to be incremented in a routine that takes the output of */ +/* SYNTHS and sends it to an audio device. It could be optionally */ +/* displayed, for those that might want to know what it is. */ +/* maxosp is never initialized to 0 in SETUP, although it probably should +*/ +/* be, and it is updated in subroutine ANALYS. I doubt that its value */ +/* would be of much interest to an application in which LPC10 is */ +/* embedded. */ +/* listl and lincnt are not needed for an embedded LPC10 at all. */ +/* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */ +/* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */ +/* common /contrl/ quant, nbits */ +/* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */ +/* Local variables that need not be saved */ +/* Uncoded speech parameters */ +/* Coded speech parameters */ +/* Others */ +/* Local state */ +/* None */ + /* Parameter adjustments */ + if (bits) { + --bits; + } + if (speech) { + --speech; + } + + /* Function Body */ + + chanrd_(&c__10, &ipitv, &irms, irc, &bits[1]); + decode_(&ipitv, &irms, irc, voice, &pitch, &rms, rc, st); + synths_(voice, &pitch, &rms, rc, &speech[1], &len, st); + return 0; +} /* lpcdec_ */ |