Chris@0: /*
Chris@0: ** Copyright (C) 1999-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
Chris@0: **
Chris@0: ** This program is free software; you can redistribute it and/or modify
Chris@0: ** it under the terms of the GNU General Public License as published by
Chris@0: ** the Free Software Foundation; either version 2 of the License, or
Chris@0: ** (at your option) any later version.
Chris@0: **
Chris@0: ** This program is distributed in the hope that it will be useful,
Chris@0: ** but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@0: ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@0: ** GNU General Public License for more details.
Chris@0: **
Chris@0: ** You should have received a copy of the GNU General Public License
Chris@0: ** along with this program; if not, write to the Free Software
Chris@0: ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Chris@0: */
Chris@0: 
Chris@0: #include "sfconfig.h"
Chris@0: 
Chris@0: #include <stdio.h>
Chris@0: #include <stdlib.h>
Chris@0: #include <string.h>
Chris@0: 
Chris@0: #if HAVE_UNISTD_H
Chris@0: #include <unistd.h>
Chris@0: #endif
Chris@0: 
Chris@0: #include <sndfile.h>
Chris@0: 
Chris@0: #include "utils.h"
Chris@0: 
Chris@0: #define	BUFFER_SIZE		(65536)
Chris@0: 
Chris@0: static unsigned char	alaw_encode (int sample) ;
Chris@0: static int				alaw_decode (unsigned int alawbyte) ;
Chris@0: 
Chris@0: static	short			short_buffer [BUFFER_SIZE] ;
Chris@0: static	unsigned char	alaw_buffer [BUFFER_SIZE] ;
Chris@0: 
Chris@0: int
Chris@0: main (void)
Chris@0: {	SNDFILE		*file ;
Chris@0: 	SF_INFO		sfinfo ;
Chris@0: 	const char	*filename ;
Chris@0: 	int			k ;
Chris@0: 
Chris@0: 	print_test_name ("alaw_test", "encoder") ;
Chris@0: 
Chris@0: 	filename = "test.raw" ;
Chris@0: 
Chris@0: 	sf_info_setup (&sfinfo, SF_FORMAT_RAW | SF_FORMAT_ALAW, 44100, 1) ;
Chris@0: 
Chris@0: 	if ((file = sf_open (filename, SFM_WRITE, &sfinfo)) == NULL)
Chris@0: 	{	printf ("sf_open_write failed with error : ") ;
Chris@0: 		fflush (stdout) ;
Chris@0: 		puts (sf_strerror (NULL)) ;
Chris@0: 		exit (1) ;
Chris@0: 		} ;
Chris@0: 
Chris@0: 	/* Generate a file containing all possible 16 bit sample values
Chris@0: 	** and write it to disk as alaw encoded.frames.
Chris@0: 	*/
Chris@0: 
Chris@0: 	for (k = 0 ; k < 0x10000 ; k++)
Chris@0: 		short_buffer [k] = k & 0xFFFF ;
Chris@0: 
Chris@0: 	sf_write_short (file, short_buffer, BUFFER_SIZE) ;
Chris@0: 	sf_close (file) ;
Chris@0: 
Chris@0: 	/* Now open that file and compare the alaw encoded sample values
Chris@0: 	** with what they should be.
Chris@0: 	*/
Chris@0: 
Chris@0: 	if ((file = sf_open (filename, SFM_READ, &sfinfo)) == NULL)
Chris@0: 	{	printf ("sf_open_write failed with error : ") ;
Chris@0: 		puts (sf_strerror (NULL)) ;
Chris@0: 		exit (1) ;
Chris@0: 		} ;
Chris@0: 
Chris@0: 	check_log_buffer_or_die (file, __LINE__) ;
Chris@0: 
Chris@0: 	if (sf_read_raw (file, alaw_buffer, BUFFER_SIZE) != BUFFER_SIZE)
Chris@0: 	{	printf ("sf_read_raw : ") ;
Chris@0: 		puts (sf_strerror (file)) ;
Chris@0: 		exit (1) ;
Chris@0: 		} ;
Chris@0: 
Chris@0: 	for (k = 0 ; k < 0x10000 ; k++)
Chris@0: 		if (alaw_encode (short_buffer [k]) != alaw_buffer [k])
Chris@0: 		{	printf ("Encoder error : sample #%d (0x%02X should be 0x%02X)\n", k, alaw_buffer [k], alaw_encode (short_buffer [k])) ;
Chris@0: 			exit (1) ;
Chris@0: 			} ;
Chris@0: 
Chris@0: 	sf_close (file) ;
Chris@0: 
Chris@0: 	puts ("ok") ;
Chris@0: 
Chris@0: 	print_test_name ("alaw_test", "decoder") ;
Chris@0: 	/* Now generate a file containing all possible 8 bit encoded
Chris@0: 	** sample values and write it to disk as alaw encoded.frames.
Chris@0: 	*/
Chris@0: 
Chris@0: 	if (! (file = sf_open (filename, SFM_WRITE, &sfinfo)))
Chris@0: 	{	printf ("sf_open_write failed with error : ") ;
Chris@0: 		puts (sf_strerror (NULL)) ;
Chris@0: 		exit (1) ;
Chris@0: 		} ;
Chris@0: 
Chris@0: 	for (k = 0 ; k < 256 ; k++)
Chris@0: 		alaw_buffer [k] = k & 0xFF ;
Chris@0: 
Chris@0: 	sf_write_raw (file, alaw_buffer, 256) ;
Chris@0: 	sf_close (file) ;
Chris@0: 
Chris@0: 	/* Now open that file and compare the alaw decoded sample values
Chris@0: 	** with what they should be.
Chris@0: 	*/
Chris@0: 
Chris@0: 	if (! (file = sf_open (filename, SFM_READ, &sfinfo)))
Chris@0: 	{	printf ("sf_open_write failed with error : ") ;
Chris@0: 		puts (sf_strerror (NULL)) ;
Chris@0: 		exit (1) ;
Chris@0: 		} ;
Chris@0: 
Chris@0: 	check_log_buffer_or_die (file, __LINE__) ;
Chris@0: 
Chris@0: 	if (sf_read_short (file, short_buffer, 256) != 256)
Chris@0: 	{	printf ("sf_read_short : ") ;
Chris@0: 		puts (sf_strerror (file)) ;
Chris@0: 		exit (1) ;
Chris@0: 		} ;
Chris@0: 
Chris@0: 
Chris@0: 	for (k = 0 ; k < 256 ; k++)
Chris@0: 		if (short_buffer [k] != alaw_decode (alaw_buffer [k]))
Chris@0: 		{	printf ("Decoder error : sample #%d (0x%02X should be 0x%02X)\n", k, short_buffer [k], alaw_decode (alaw_buffer [k])) ;
Chris@0: 			exit (1) ;
Chris@0: 			} ;
Chris@0: 
Chris@0: 	sf_close (file) ;
Chris@0: 
Chris@0: 	puts ("ok") ;
Chris@0: 
Chris@0: 	unlink (filename) ;
Chris@0: 
Chris@0: 	return 0 ;
Chris@0: } /* main */
Chris@0: 
Chris@0: 
Chris@0: /*=================================================================================
Chris@0: **	The following routines came from the sox-12.15 (Sound eXcahcnge) distribution.
Chris@0: **
Chris@0: **	This code is not compiled into libsndfile. It is only used to test the
Chris@0: **	libsndfile lookup tables for correctness.
Chris@0: **
Chris@0: **	I have included the original authors comments.
Chris@0: */
Chris@0: 
Chris@0: /*
Chris@0: ** A-law routines by Graeme W. Gill.
Chris@0: ** Date: 93/5/7
Chris@0: **
Chris@0: ** References:
Chris@0: ** 1) CCITT Recommendation G.711
Chris@0: **
Chris@0: */
Chris@0: 
Chris@0: #define ACLIP 31744
Chris@0: 
Chris@0: static
Chris@0: unsigned char alaw_encode (int sample)
Chris@0: {	static int exp_lut [128] =
Chris@0: 	{	1, 1, 2, 2, 3, 3, 3, 3,
Chris@0: 		4, 4, 4, 4, 4, 4, 4, 4,
Chris@0: 		5, 5, 5, 5, 5, 5, 5, 5,
Chris@0: 		5, 5, 5, 5, 5, 5, 5, 5,
Chris@0: 		6, 6, 6, 6, 6, 6, 6, 6,
Chris@0: 		6, 6, 6, 6, 6, 6, 6, 6,
Chris@0: 		6, 6, 6, 6, 6, 6, 6, 6,
Chris@0: 		6, 6, 6, 6, 6, 6, 6, 6,
Chris@0: 		7, 7, 7, 7, 7, 7, 7, 7,
Chris@0: 		7, 7, 7, 7, 7, 7, 7, 7,
Chris@0: 		7, 7, 7, 7, 7, 7, 7, 7,
Chris@0: 		7, 7, 7, 7, 7, 7, 7, 7,
Chris@0: 		7, 7, 7, 7, 7, 7, 7, 7,
Chris@0: 		7, 7, 7, 7, 7, 7, 7, 7,
Chris@0: 		7, 7, 7, 7, 7, 7, 7, 7,
Chris@0: 		7, 7, 7, 7, 7, 7, 7, 7
Chris@0: 		} ;
Chris@0: 
Chris@0:     int sign, exponent, mantissa ;
Chris@0:     unsigned char Alawbyte ;
Chris@0: 
Chris@0:     /* Get the sample into sign-magnitude. */
Chris@0:     sign = ((~sample) >> 8) & 0x80 ;			/* set aside the sign */
Chris@0:     if (sign == 0)
Chris@0: 		sample = -sample ;		/* get magnitude */
Chris@0:     if (sample > ACLIP)
Chris@0: 		sample = ACLIP ;						/* clip the magnitude */
Chris@0: 
Chris@0:     /* Convert from 16 bit linear to ulaw. */
Chris@0:     if (sample >= 256)
Chris@0: 	{	exponent = exp_lut [(sample >> 8) & 0x7F] ;
Chris@0: 		mantissa = ( sample >> ( exponent + 3 ) ) & 0x0F ;
Chris@0: 		Alawbyte = ((exponent << 4) | mantissa) ;
Chris@0: 		}
Chris@0:     else
Chris@0: 		Alawbyte = (sample >> 4) ;
Chris@0: 
Chris@0: 	Alawbyte ^= (sign ^ 0x55) ;
Chris@0: 
Chris@0:     return Alawbyte ;
Chris@0: } /* alaw_encode */
Chris@0: 
Chris@0: static
Chris@0: int alaw_decode (unsigned int Alawbyte)
Chris@0: {	static int exp_lut [8] = { 0, 264, 528, 1056, 2112, 4224, 8448, 16896 } ;
Chris@0:     int sign, exponent, mantissa, sample ;
Chris@0: 
Chris@0:     Alawbyte ^= 0x55 ;
Chris@0:     sign = (Alawbyte & 0x80) ;
Chris@0:     Alawbyte &= 0x7f ;			/* get magnitude */
Chris@0:     if (Alawbyte >= 16)
Chris@0: 	{	exponent = (Alawbyte >> 4 ) & 0x07 ;
Chris@0: 		mantissa = Alawbyte & 0x0F ;
Chris@0: 		sample = exp_lut [exponent] + (mantissa << ( exponent + 3 )) ;
Chris@0: 		}
Chris@0:     else
Chris@0: 		sample = (Alawbyte << 4) + 8 ;
Chris@0:     if (sign == 0)
Chris@0: 		sample = -sample ;
Chris@0: 
Chris@0:     return sample ;
Chris@0: } /* alaw_decode */
Chris@0: