+++ /dev/null
-/*
-** Copyright (C) 1999-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
-**
-** This program is free software; you can redistribute it and/or modify
-** it under the terms of the GNU General Public License as published by
-** the Free Software Foundation; either version 2 of the License, or
-** (at your option) any later version.
-**
-** This program is distributed in the hope that it will be useful,
-** but WITHOUT ANY WARRANTY; without even the implied warranty of
-** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-** GNU General Public License for more details.
-**
-** You should have received a copy of the GNU General Public License
-** along with this program; if not, write to the Free Software
-** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-*/
-
-#include "sfconfig.h"
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#if HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-
-#include <sndfile.h>
-
-#include "utils.h"
-
-#define BUFFER_SIZE (65536)
-
-static unsigned char ulaw_encode (int sample) ;
-static int ulaw_decode (unsigned int ulawbyte) ;
-
-static short short_buffer [BUFFER_SIZE] ;
-static unsigned char ulaw_buffer [BUFFER_SIZE] ;
-
-int
-main (void)
-{ SNDFILE *file ;
- SF_INFO sfinfo ;
- const char *filename ;
- int k ;
-
- print_test_name ("ulaw_test", "encoder") ;
-
- filename = "test.raw" ;
-
- sf_info_setup (&sfinfo, SF_FORMAT_RAW | SF_FORMAT_ULAW, 44100, 1) ;
-
- if ((file = sf_open (filename, SFM_WRITE, &sfinfo)) == NULL)
- { printf ("sf_open_write failed with error : ") ;
- fflush (stdout) ;
- puts (sf_strerror (NULL)) ;
- exit (1) ;
- } ;
-
- /* Generate a file containing all possible 16 bit sample values
- ** and write it to disk as ulaw encoded.frames.
- */
-
- for (k = 0 ; k < 0x10000 ; k++)
- short_buffer [k] = k & 0xFFFF ;
-
- sf_write_short (file, short_buffer, BUFFER_SIZE) ;
- sf_close (file) ;
-
- /* Now open that file and compare the ulaw encoded sample values
- ** with what they should be.
- */
-
- if ((file = sf_open (filename, SFM_READ, &sfinfo)) == NULL)
- { printf ("sf_open_write failed with error : ") ;
- puts (sf_strerror (NULL)) ;
- exit (1) ;
- } ;
-
- check_log_buffer_or_die (file, __LINE__) ;
-
- if (sf_read_raw (file, ulaw_buffer, BUFFER_SIZE) != BUFFER_SIZE)
- { printf ("sf_read_raw : ") ;
- puts (sf_strerror (file)) ;
- exit (1) ;
- } ;
-
- for (k = 0 ; k < 0x10000 ; k++)
- if (ulaw_encode (short_buffer [k]) != ulaw_buffer [k])
- { printf ("Encoder error : sample #%d (0x%02X should be 0x%02X)\n", k, ulaw_buffer [k], ulaw_encode (short_buffer [k])) ;
- exit (1) ;
- } ;
-
- sf_close (file) ;
-
- puts ("ok") ;
-
- print_test_name ("ulaw_test", "decoder") ;
-
- /* Now generate a file containing all possible 8 bit encoded
- ** sample values and write it to disk as ulaw encoded.frames.
- */
-
- if (! (file = sf_open (filename, SFM_WRITE, &sfinfo)))
- { printf ("sf_open_write failed with error : ") ;
- puts (sf_strerror (NULL)) ;
- exit (1) ;
- } ;
-
- for (k = 0 ; k < 256 ; k++)
- ulaw_buffer [k] = k & 0xFF ;
-
- sf_write_raw (file, ulaw_buffer, 256) ;
- sf_close (file) ;
-
- /* Now open that file and compare the ulaw decoded sample values
- ** with what they should be.
- */
-
- if (! (file = sf_open (filename, SFM_READ, &sfinfo)))
- { printf ("sf_open_write failed with error : ") ;
- puts (sf_strerror (NULL)) ;
- exit (1) ;
- } ;
-
- check_log_buffer_or_die (file, __LINE__) ;
-
- if (sf_read_short (file, short_buffer, 256) != 256)
- { printf ("sf_read_short : ") ;
- puts (sf_strerror (file)) ;
- exit (1) ;
- } ;
-
-
- for (k = 0 ; k < 256 ; k++)
- if (short_buffer [k] != ulaw_decode (ulaw_buffer [k]))
- { printf ("Decoder error : sample #%d (0x%04X should be 0x%04X)\n", k, short_buffer [k], ulaw_decode (ulaw_buffer [k])) ;
- exit (1) ;
- } ;
-
- sf_close (file) ;
-
- puts ("ok") ;
-
- unlink (filename) ;
-
- return 0 ;
-} /* main */
-
-
-/*=================================================================================
-** The following routines came from the sox-12.15 (Sound eXcahcnge) distribution.
-**
-** This code is not compiled into libsndfile. It is only used to test the
-** libsndfile lookup tables for correctness.
-**
-** I have included the original authors comments.
-*/
-
-/*
-** This routine converts from linear to ulaw.
-**
-** Craig Reese: IDA/Supercomputing Research Center
-** Joe Campbell: Department of Defense
-** 29 September 1989
-**
-** References:
-** 1) CCITT Recommendation G.711 (very difficult to follow)
-** 2) "A New Digital Technique for Implementation of Any
-** Continuous PCM Companding Law," Villeret, Michel,
-** et al. 1973 IEEE Int. Conf. on Communications, Vol 1,
-** 1973, pg. 11.12-11.17
-** 3) MIL-STD-188-113,"Interoperability and Performance Standards
-** for Analog-to_Digital Conversion Techniques,"
-** 17 February 1987
-**
-** Input: Signed 16 bit linear sample
-** Output: 8 bit ulaw sample
-*/
-
-#define uBIAS 0x84 /* define the add-in bias for 16 bit.frames */
-#define uCLIP 32635
-
-static
-unsigned char ulaw_encode (int sample)
-{ static int exp_lut [256] =
- { 0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
- 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
- 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
- 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
- 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
- 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
- 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
- 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
- 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
- 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
- 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
- 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
- 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
- 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
- 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
- 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
- } ;
-
- int sign, exponent, mantissa ;
- unsigned char ulawbyte ;
-
- /* Get the sample into sign-magnitude. */
- sign = (sample >> 8) & 0x80 ; /* set aside the sign */
- if ( sign != 0 )
- sample = -sample ; /* get magnitude */
- if ( sample > uCLIP )
- sample = uCLIP ; /* clip the magnitude */
-
- /* Convert from 16 bit linear to ulaw. */
- sample = sample + uBIAS ;
- exponent = exp_lut [( sample >> 7 ) & 0xFF] ;
- mantissa = (sample >> ( exponent + 3 ) ) & 0x0F ;
- ulawbyte = ~ (sign | ( exponent << 4 ) | mantissa) ;
-
- return ulawbyte ;
-} /* ulaw_encode */
-
-
-/*
-** This routine converts from ulaw to 16 bit linear.
-**
-** Craig Reese: IDA/Supercomputing Research Center
-** 29 September 1989
-**
-** References:
-** 1) CCITT Recommendation G.711 (very difficult to follow)
-** 2) MIL-STD-188-113,"Interoperability and Performance Standards
-** for Analog-to_Digital Conversion Techniques,"
-** 17 February 1987
-**
-** Input: 8 bit ulaw sample
-** Output: signed 16 bit linear sample
-*/
-
-static
-int ulaw_decode (unsigned int ulawbyte)
-{ static int exp_lut [8] = { 0, 132, 396, 924, 1980, 4092, 8316, 16764 } ;
- int sign, exponent, mantissa, sample ;
-
- ulawbyte = ~ ulawbyte ;
- sign = (ulawbyte & 0x80) ;
- exponent = (ulawbyte >> 4) & 0x07 ;
- mantissa = ulawbyte & 0x0F ;
- sample = exp_lut [exponent] + (mantissa << (exponent + 3)) ;
- if (sign != 0)
- sample = -sample ;
-
- return sample ;
-} /* ulaw_decode */
-
projects / Faustine.git / blobdiff