Initial revision
This commit is contained in:
Guido van Rossum
parent
1c34fc7afb
commit
b66efa0d75
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@ -0,0 +1,574 @@
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/***********************************************************
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Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
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Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior permission.
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STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* audioopmodele - Module to detect peak values in arrays */
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#ifdef sun
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#define signed
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#endif
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#include "allobjects.h"
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#include "modsupport.h"
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/* Code shamelessly stealen from sox,
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** (c) Craig Reese, Joe Campbell and Jeff Poskanzer 1989 */
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#define MINLIN -32768
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#define MAXLIN 32767
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#define LINCLIP(x) do { if ( x < MINLIN ) x = MINLIN ; else if ( x > MAXLIN ) x = MAXLIN; } while ( 0 )
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unsigned char st_linear_to_ulaw( /* int sample */ );
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/*
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** This macro converts from ulaw to 16 bit linear, faster.
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**
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** Jef Poskanzer
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** 23 October 1989
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**
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** Input: 8 bit ulaw sample
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** Output: signed 16 bit linear sample
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*/
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#define st_ulaw_to_linear(ulawbyte) ulaw_table[ulawbyte]
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static int ulaw_table[256] = {
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-32124, -31100, -30076, -29052, -28028, -27004, -25980, -24956,
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-23932, -22908, -21884, -20860, -19836, -18812, -17788, -16764,
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-15996, -15484, -14972, -14460, -13948, -13436, -12924, -12412,
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-11900, -11388, -10876, -10364, -9852, -9340, -8828, -8316,
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-7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140,
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-5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092,
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-3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004,
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-2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980,
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-1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436,
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-1372, -1308, -1244, -1180, -1116, -1052, -988, -924,
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-876, -844, -812, -780, -748, -716, -684, -652,
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-620, -588, -556, -524, -492, -460, -428, -396,
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-372, -356, -340, -324, -308, -292, -276, -260,
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-244, -228, -212, -196, -180, -164, -148, -132,
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-120, -112, -104, -96, -88, -80, -72, -64,
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-56, -48, -40, -32, -24, -16, -8, 0,
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32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956,
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23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764,
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15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,
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11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316,
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7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140,
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5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092,
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3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004,
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2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980,
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1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436,
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1372, 1308, 1244, 1180, 1116, 1052, 988, 924,
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876, 844, 812, 780, 748, 716, 684, 652,
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620, 588, 556, 524, 492, 460, 428, 396,
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372, 356, 340, 324, 308, 292, 276, 260,
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244, 228, 212, 196, 180, 164, 148, 132,
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120, 112, 104, 96, 88, 80, 72, 64,
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56, 48, 40, 32, 24, 16, 8, 0 };
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#define ZEROTRAP /* turn on the trap as per the MIL-STD */
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#define BIAS 0x84 /* define the add-in bias for 16 bit samples */
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#define CLIP 32635
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unsigned char
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st_linear_to_ulaw( sample )
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int sample;
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{
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static int exp_lut[256] = {0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,
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4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
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5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
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5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
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6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
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6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
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6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
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6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7};
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int sign, exponent, mantissa;
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unsigned char ulawbyte;
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/* Get the sample into sign-magnitude. */
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sign = (sample >> 8) & 0x80; /* set aside the sign */
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if ( sign != 0 ) sample = -sample; /* get magnitude */
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if ( sample > CLIP ) sample = CLIP; /* clip the magnitude */
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/* Convert from 16 bit linear to ulaw. */
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sample = sample + BIAS;
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exponent = exp_lut[( sample >> 7 ) & 0xFF];
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mantissa = ( sample >> ( exponent + 3 ) ) & 0x0F;
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ulawbyte = ~ ( sign | ( exponent << 4 ) | mantissa );
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#ifdef ZEROTRAP
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if ( ulawbyte == 0 ) ulawbyte = 0x02; /* optional CCITT trap */
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#endif
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return ulawbyte;
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}
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/* End of code taken from sox */
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#define CHARP(cp, i) ((signed char *)(cp+i))
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#define SHORTP(cp, i) ((short *)(cp+i))
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#define LONGP(cp, i) ((long *)(cp+i))
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static object *AudioopError;
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static object *
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audioop_getsample(self, args)
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object *self;
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object *args;
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{
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signed char *cp;
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int len, size, val;
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int i;
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if ( !getargs(args, "(s#ii)", &cp, &len, &size, &i) )
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return 0;
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if ( size != 1 && size != 2 && size != 4 ) {
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err_setstr(AudioopError, "Size should be 1, 2 or 4");
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return 0;
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}
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if ( i < 0 || i >= len/size ) {
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err_setstr(AudioopError, "Index out of range");
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return 0;
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}
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if ( size == 1 ) val = (int)*CHARP(cp, i);
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else if ( size == 2 ) val = (int)*SHORTP(cp, i*2);
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else if ( size == 4 ) val = (int)*LONGP(cp, i*4);
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return newintobject(val);
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}
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static object *
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audioop_max(self, args)
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object *self;
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object *args;
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{
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signed char *cp;
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int len, size, val;
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int i;
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int max = 0;
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if ( !getargs(args, "(s#i)", &cp, &len, &size) )
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return 0;
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if ( size != 1 && size != 2 && size != 4 ) {
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err_setstr(AudioopError, "Size should be 1, 2 or 4");
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return 0;
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}
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for ( i=0; i<len; i+= size) {
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if ( size == 1 ) val = (int)*CHARP(cp, i);
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else if ( size == 2 ) val = (int)*SHORTP(cp, i);
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else if ( size == 4 ) val = (int)*LONGP(cp, i);
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if ( val < 0 ) val = (-val);
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if ( val > max ) max = val;
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}
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return newintobject(max);
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}
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static object *
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audioop_avg(self, args)
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object *self;
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object *args;
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{
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signed char *cp;
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int len, size, val;
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int i;
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float avg = 0.0;
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if ( !getargs(args, "(s#i)", &cp, &len, &size) )
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return 0;
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if ( size != 1 && size != 2 && size != 4 ) {
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err_setstr(AudioopError, "Size should be 1, 2 or 4");
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return 0;
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}
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for ( i=0; i<len; i+= size) {
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if ( size == 1 ) val = (int)*CHARP(cp, i);
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else if ( size == 2 ) val = (int)*SHORTP(cp, i);
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else if ( size == 4 ) val = (int)*LONGP(cp, i);
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avg += val;
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}
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if ( len == 0 )
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val = 0;
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else
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val = (int)(avg / (float)(len/size));
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return newintobject(val);
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}
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static object *
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audioop_cross(self, args)
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object *self;
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object *args;
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{
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signed char *cp;
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int len, size, val;
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int i;
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int cross, prevval, ncross;
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if ( !getargs(args, "(s#i)", &cp, &len, &size) )
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return 0;
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if ( size != 1 && size != 2 && size != 4 ) {
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err_setstr(AudioopError, "Size should be 1, 2 or 4");
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return 0;
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}
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ncross = -1;
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prevval = 17; /* Anything <> 0,1 */
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for ( i=0; i<len; i+= size) {
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if ( size == 1 ) val = ((int)*CHARP(cp, i)) >> 7;
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else if ( size == 2 ) val = ((int)*SHORTP(cp, i)) >> 15;
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else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 31;
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val = val & 1;
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if ( val != prevval ) ncross++;
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prevval = val;
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}
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return newintobject(ncross);
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}
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static object *
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audioop_mul(self, args)
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object *self;
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object *args;
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{
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signed char *cp, *ncp;
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int len, size, val;
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double factor, fval, maxval;
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object *rv;
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int i;
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if ( !getargs(args, "(s#id)", &cp, &len, &size, &factor ) )
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return 0;
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if ( size == 1 ) maxval = (double) 0x7f;
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else if ( size == 2 ) maxval = (double) 0x7fff;
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else if ( size == 4 ) maxval = (double) 0x7fffffff;
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else {
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err_setstr(AudioopError, "Size should be 1, 2 or 4");
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return 0;
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}
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rv = newsizedstringobject(NULL, len);
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if ( rv == 0 )
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return 0;
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ncp = (signed char *)getstringvalue(rv);
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for ( i=0; i < len; i += size ) {
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if ( size == 1 ) val = (int)*CHARP(cp, i);
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else if ( size == 2 ) val = (int)*SHORTP(cp, i);
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else if ( size == 4 ) val = (int)*LONGP(cp, i);
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fval = (double)val*factor;
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if ( fval > maxval ) fval = maxval;
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else if ( fval < -maxval ) fval = -maxval;
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val = (int)fval;
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if ( size == 1 ) *CHARP(ncp, i) = (signed char)val;
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else if ( size == 2 ) *SHORTP(ncp, i) = (short)val;
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else if ( size == 4 ) *LONGP(ncp, i) = (long)val;
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}
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return rv;
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}
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static object *
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audioop_tomono(self, args)
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object *self;
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object *args;
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{
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signed char *cp, *ncp;
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int len, size, val1, val2;
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double fac1, fac2, fval, maxval;
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object *rv;
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int i;
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if ( !getargs(args, "(s#idd)", &cp, &len, &size, &fac1, &fac2 ) )
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return 0;
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if ( size == 1 ) maxval = (double) 0x7f;
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else if ( size == 2 ) maxval = (double) 0x7fff;
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else if ( size == 4 ) maxval = (double) 0x7fffffff;
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else {
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err_setstr(AudioopError, "Size should be 1, 2 or 4");
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return 0;
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}
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rv = newsizedstringobject(NULL, len/2);
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if ( rv == 0 )
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return 0;
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ncp = (signed char *)getstringvalue(rv);
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for ( i=0; i < len; i += size*2 ) {
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if ( size == 1 ) val1 = (int)*CHARP(cp, i);
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else if ( size == 2 ) val1 = (int)*SHORTP(cp, i);
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else if ( size == 4 ) val1 = (int)*LONGP(cp, i);
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if ( size == 1 ) val2 = (int)*CHARP(cp, i+1);
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else if ( size == 2 ) val2 = (int)*SHORTP(cp, i+2);
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else if ( size == 4 ) val2 = (int)*LONGP(cp, i+4);
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fval = (double)val1*fac1 + (double)val2*fac2;
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if ( fval > maxval ) fval = maxval;
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else if ( fval < -maxval ) fval = -maxval;
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val1 = (int)fval;
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if ( size == 1 ) *CHARP(ncp, i/2) = (signed char)val1;
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else if ( size == 2 ) *SHORTP(ncp, i/2) = (short)val1;
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else if ( size == 4 ) *LONGP(ncp, i/2)= (long)val1;
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}
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return rv;
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}
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static object *
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audioop_tostereo(self, args)
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object *self;
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object *args;
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||||
{
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||||
signed char *cp, *ncp;
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||||
int len, size, val1, val2, val;
|
||||
double fac1, fac2, fval, maxval;
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||||
object *rv;
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||||
int i;
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||||
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||||
if ( !getargs(args, "(s#idd)", &cp, &len, &size, &fac1, &fac2 ) )
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return 0;
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||||
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||||
if ( size == 1 ) maxval = (double) 0x7f;
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||||
else if ( size == 2 ) maxval = (double) 0x7fff;
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||||
else if ( size == 4 ) maxval = (double) 0x7fffffff;
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||||
else {
|
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err_setstr(AudioopError, "Size should be 1, 2 or 4");
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return 0;
|
||||
}
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||||
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||||
rv = newsizedstringobject(NULL, len*2);
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||||
if ( rv == 0 )
|
||||
return 0;
|
||||
ncp = (signed char *)getstringvalue(rv);
|
||||
|
||||
|
||||
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);
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||||
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||||
fval = (double)val*fac1;
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||||
if ( fval > maxval ) fval = maxval;
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||||
else if ( fval < -maxval ) fval = -maxval;
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||||
val1 = (int)fval;
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||||
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fval = (double)val*fac2;
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if ( fval > maxval ) fval = maxval;
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else if ( fval < -maxval ) fval = -maxval;
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val2 = (int)fval;
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||||
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||||
if ( size == 1 ) *CHARP(ncp, i*2) = (signed char)val1;
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||||
else if ( size == 2 ) *SHORTP(ncp, i*2) = (short)val1;
|
||||
else if ( size == 4 ) *LONGP(ncp, i*2) = (long)val1;
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||||
|
||||
if ( size == 1 ) *CHARP(ncp, i*2+1) = (signed char)val2;
|
||||
else if ( size == 2 ) *SHORTP(ncp, i*2+2) = (short)val2;
|
||||
else if ( size == 4 ) *LONGP(ncp, i*2+4) = (long)val2;
|
||||
}
|
||||
return rv;
|
||||
}
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||||
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||||
static object *
|
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audioop_add(self, args)
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||||
object *self;
|
||||
object *args;
|
||||
{
|
||||
signed char *cp1, *cp2, *ncp;
|
||||
int len1, len2, size, val1, val2;
|
||||
object *rv;
|
||||
int i;
|
||||
|
||||
if ( !getargs(args, "(s#s#i)",
|
||||
&cp1, &len1, &cp2, &len2, &size ) )
|
||||
return 0;
|
||||
|
||||
if ( len1 != len2 ) {
|
||||
err_setstr(AudioopError, "Lengths should be the same");
|
||||
return 0;
|
||||
}
|
||||
|
||||
if ( size != 1 && size != 2 && size != 4) {
|
||||
err_setstr(AudioopError, "Size should be 1, 2 or 4");
|
||||
return 0;
|
||||
}
|
||||
|
||||
rv = newsizedstringobject(NULL, len1);
|
||||
if ( rv == 0 )
|
||||
return 0;
|
||||
ncp = (signed char *)getstringvalue(rv);
|
||||
|
||||
|
||||
for ( i=0; i < len1; i += size ) {
|
||||
if ( size == 1 ) val1 = (int)*CHARP(cp1, i);
|
||||
else if ( size == 2 ) val1 = (int)*SHORTP(cp1, i);
|
||||
else if ( size == 4 ) val1 = (int)*LONGP(cp1, i);
|
||||
|
||||
if ( size == 1 ) val2 = (int)*CHARP(cp2, i);
|
||||
else if ( size == 2 ) val2 = (int)*SHORTP(cp2, i);
|
||||
else if ( size == 4 ) val2 = (int)*LONGP(cp2, i);
|
||||
|
||||
if ( size == 1 ) *CHARP(ncp, i) = (signed char)(val1+val2);
|
||||
else if ( size == 2 ) *SHORTP(ncp, i) = (short)(val1+val2);
|
||||
else if ( size == 4 ) *LONGP(ncp, i) = (long)(val1+val2);
|
||||
}
|
||||
return rv;
|
||||
}
|
||||
|
||||
static object *
|
||||
audioop_bias(self, args)
|
||||
object *self;
|
||||
object *args;
|
||||
{
|
||||
signed char *cp, *ncp;
|
||||
int len, size, val;
|
||||
object *rv;
|
||||
int i;
|
||||
int bias;
|
||||
|
||||
if ( !getargs(args, "(s#ii)",
|
||||
&cp, &len, &size , &bias) )
|
||||
return 0;
|
||||
|
||||
if ( size != 1 && size != 2 && size != 4) {
|
||||
err_setstr(AudioopError, "Size should be 1, 2 or 4");
|
||||
return 0;
|
||||
}
|
||||
|
||||
rv = newsizedstringobject(NULL, len);
|
||||
if ( rv == 0 )
|
||||
return 0;
|
||||
ncp = (signed char *)getstringvalue(rv);
|
||||
|
||||
|
||||
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 ( size == 1 ) *CHARP(ncp, i) = (signed char)(val+bias);
|
||||
else if ( size == 2 ) *SHORTP(ncp, i) = (short)(val+bias);
|
||||
else if ( size == 4 ) *LONGP(ncp, i) = (long)(val+bias);
|
||||
}
|
||||
return rv;
|
||||
}
|
||||
|
||||
static object *
|
||||
audioop_lin2ulaw(self, args)
|
||||
object *self;
|
||||
object *args;
|
||||
{
|
||||
signed char *cp;
|
||||
unsigned char *ncp;
|
||||
int len, size, val;
|
||||
object *rv;
|
||||
int i;
|
||||
|
||||
if ( !getargs(args, "(s#i)",
|
||||
&cp, &len, &size) )
|
||||
return 0;
|
||||
|
||||
if ( size != 1 && size != 2 && size != 4) {
|
||||
err_setstr(AudioopError, "Size should be 1, 2 or 4");
|
||||
return 0;
|
||||
}
|
||||
|
||||
rv = newsizedstringobject(NULL, len/size);
|
||||
if ( rv == 0 )
|
||||
return 0;
|
||||
ncp = (unsigned char *)getstringvalue(rv);
|
||||
|
||||
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;
|
||||
|
||||
*ncp++ = st_linear_to_ulaw(val);
|
||||
}
|
||||
return rv;
|
||||
}
|
||||
|
||||
static object *
|
||||
audioop_ulaw2lin(self, args)
|
||||
object *self;
|
||||
object *args;
|
||||
{
|
||||
unsigned char *cp;
|
||||
unsigned char cval;
|
||||
signed char *ncp;
|
||||
int len, size, val;
|
||||
object *rv;
|
||||
int i;
|
||||
|
||||
if ( !getargs(args, "(s#i)",
|
||||
&cp, &len, &size) )
|
||||
return 0;
|
||||
|
||||
if ( size != 1 && size != 2 && size != 4) {
|
||||
err_setstr(AudioopError, "Size should be 1, 2 or 4");
|
||||
return 0;
|
||||
}
|
||||
|
||||
rv = newsizedstringobject(NULL, len*size);
|
||||
if ( rv == 0 )
|
||||
return 0;
|
||||
ncp = (signed char *)getstringvalue(rv);
|
||||
|
||||
for ( i=0; i < len*size; i += size ) {
|
||||
cval = *cp++;
|
||||
val = st_ulaw_to_linear(cval);
|
||||
|
||||
if ( size == 1 ) *CHARP(ncp, i) = (signed char)(val >> 8);
|
||||
else if ( size == 2 ) *SHORTP(ncp, i) = (short)(val);
|
||||
else if ( size == 4 ) *LONGP(ncp, i) = (long)(val>>16);
|
||||
}
|
||||
return rv;
|
||||
}
|
||||
|
||||
static struct methodlist audioop_methods[] = {
|
||||
{ "max", audioop_max },
|
||||
{ "avg", audioop_avg },
|
||||
{ "cross", audioop_cross },
|
||||
{ "mul", audioop_mul },
|
||||
{ "add", audioop_add },
|
||||
{ "bias", audioop_bias },
|
||||
{ "ulaw2lin", audioop_ulaw2lin },
|
||||
{ "lin2ulaw", audioop_lin2ulaw },
|
||||
{ "tomono", audioop_tomono },
|
||||
{ "tostereo", audioop_tostereo },
|
||||
{ "getsample", audioop_getsample },
|
||||
{ 0, 0 }
|
||||
};
|
||||
|
||||
|
||||
void
|
||||
initaudioop()
|
||||
{
|
||||
object *m, *d;
|
||||
m = initmodule("audioop", audioop_methods);
|
||||
d = getmoduledict(m);
|
||||
AudioopError = newstringobject("audioop.error");
|
||||
if ( AudioopError == NULL || dictinsert(d,"error",AudioopError) )
|
||||
fatal("can't define audioop.error");
|
||||
}
|
||||
Loading…
Reference in New Issue