diff options
Diffstat (limited to 'Modules/audioop.c')
| -rw-r--r-- | Modules/audioop.c | 175 |
1 files changed, 9 insertions, 166 deletions
diff --git a/Modules/audioop.c b/Modules/audioop.c index 8bd833a..cfb97f2 100644 --- a/Modules/audioop.c +++ b/Modules/audioop.c @@ -1,5 +1,5 @@ /*********************************************************** -Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum, +Copyright 1991, 1992, 1993, 1994 by Stichting Mathematisch Centrum, Amsterdam, The Netherlands. All Rights Reserved @@ -22,17 +22,19 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ******************************************************************/ -/* audioopmodele - Module to detect peak values in arrays */ +/* audioopmodule - Module to detect peak values in arrays */ -#ifdef sun -#define signed +#include "allobjects.h" +#include "modsupport.h" + +#if defined(__CHAR_UNSIGNED__) && defined(signed) +!ERROR!; READ THE SOURCE FILE!; +/* This module currently does not work on systems where only unsigned + characters are available. Take it out of Setup. Sorry. */ #endif #include <math.h> -#include "allobjects.h" -#include "modsupport.h" - /* Code shamelessly stolen from sox, ** (c) Craig Reese, Joe Campbell and Jeff Poskanzer 1989 */ @@ -213,32 +215,6 @@ audioop_max(self, args) } static object * -audioop_minmax(self, args) - object *self; - object *args; -{ - signed char *cp; - int len, size, val; - int i; - int min = 0x7fffffff, max = -0x7fffffff; - - if (!getargs(args, "(s#i)", &cp, &len, &size)) - return NULL; - if (size != 1 && size != 2 && size != 4) { - err_setstr(AudioopError, "Size should be 1, 2 or 4"); - return NULL; - } - for (i = 0; i < len; i += size) { - if (size == 1) val = (int) *CHARP(cp, i); - else if (size == 2) val = (int) *SHORTP(cp, i); - else if (size == 4) val = (int) *LONGP(cp, i); - if (val > max) max = val; - if (val < min) min = val; - } - return mkvalue("(ii)", min, max); -} - -static object * audioop_avg(self, args) object *self; object *args; @@ -997,136 +973,6 @@ audioop_ulaw2lin(self, args) } static object * -audioop_lin2adpcm3(self, args) - object *self; - object *args; -{ - signed char *cp; - signed char *ncp; - int len, size, val, step, valprev, delta; - object *rv, *state, *str; - int i; - - if ( !getargs(args, "(s#iO)", - &cp, &len, &size, &state) ) - return 0; - - - if ( size != 1 && size != 2 && size != 4) { - err_setstr(AudioopError, "Size should be 1, 2 or 4"); - return 0; - } - - str = newsizedstringobject(NULL, len/size); - if ( str == 0 ) - return 0; - ncp = (signed char *)getstringvalue(str); - - /* Decode state, should have (value, step) */ - if ( state == None ) { - /* First time, it seems. Set defaults */ - valprev = 0; - step = 4; /* The '4' is magic. Dunno it's significance */ - } else if ( !getargs(state, "(ii)", &valprev, &step) ) - return 0; - - for ( i=0; i < len; i += size ) { - if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 8; - else if ( size == 2 ) val = (int)*SHORTP(cp, i); - else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 16; - - /* Step 1 - compute difference with previous value */ - delta = (val - valprev)/step; - - /* Step 2 - Clamp */ - if ( delta < -4 ) - delta = -4; - else if ( delta > 3 ) - delta = 3; - - /* Step 3 - Update previous value */ - valprev += delta*step; - - /* Step 4 - Clamp previous value to 16 bits */ - if ( valprev > 32767 ) - valprev = 32767; - else if ( valprev < -32768 ) - valprev = -32768; - - /* Step 5 - Update step value */ - step = step * newstep[abs(delta)]; - step++; /* Don't understand this. */ - - /* Step 6 - Output value (as a whole byte, currently) */ - *ncp++ = delta; - } - rv = mkvalue("(O(ii))", str, valprev, step); - DECREF(str); - return rv; -} - -static object * -audioop_adpcm32lin(self, args) - object *self; - object *args; -{ - signed char *cp; - signed char *ncp; - int len, size, val, valprev, step, delta; - object *rv, *str, *state; - int i; - - if ( !getargs(args, "(s#iO)", - &cp, &len, &size, &state) ) - return 0; - - if ( size != 1 && size != 2 && size != 4) { - err_setstr(AudioopError, "Size should be 1, 2 or 4"); - return 0; - } - - /* Decode state, should have (value, step) */ - if ( state == None ) { - /* First time, it seems. Set defaults */ - valprev = 0; - step = 4; /* The '4' is magic. Dunno it's significance */ - } else if ( !getargs(state, "(ii)", &valprev, &step) ) - return 0; - - str = newsizedstringobject(NULL, len*size); - if ( str == 0 ) - return 0; - ncp = (signed char *)getstringvalue(str); - - for ( i=0; i < len*size; i += size ) { - /* Step 1 - get the delta value */ - delta = *cp++; - - /* Step 2 - update output value */ - valprev = valprev + delta*step; - - /* Step 3 - clamp output value */ - if ( valprev > 32767 ) - valprev = 32767; - else if ( valprev < -32768 ) - valprev = -32768; - - /* Step 4 - Update step value */ - step = step * newstep[abs(delta)]; - step++; - - /* Step 5 - Output value */ - if ( size == 1 ) *CHARP(ncp, i) = (signed char)(valprev >> 8); - else if ( size == 2 ) *SHORTP(ncp, i) = (short)(valprev); - else if ( size == 4 ) *LONGP(ncp, i) = (long)(valprev<<16); - } - - rv = mkvalue("(O(ii))", str, valprev, step); - DECREF(str); - return rv; -} - -static object * audioop_lin2adpcm(self, args) object *self; object *args; @@ -1330,7 +1176,6 @@ audioop_adpcm2lin(self, args) static struct methodlist audioop_methods[] = { { "max", audioop_max }, - { "minmax", audioop_minmax }, { "avg", audioop_avg }, { "maxpp", audioop_maxpp }, { "avgpp", audioop_avgpp }, @@ -1347,8 +1192,6 @@ static struct methodlist audioop_methods[] = { { "lin2lin", audioop_lin2lin }, { "adpcm2lin", audioop_adpcm2lin }, { "lin2adpcm", audioop_lin2adpcm }, - { "adpcm32lin", audioop_adpcm32lin }, - { "lin2adpcm3", audioop_lin2adpcm3 }, { "tomono", audioop_tomono }, { "tostereo", audioop_tostereo }, { "getsample", audioop_getsample }, |