X-Git-Url: https://scm.cri.ensmp.fr/git/Faustine.git/blobdiff_plain/1059e1cc0c2ecfa237406949aa26155b6a5b9154..66f23d4fabf89ad09adbd4dfc15ac6b5b2b7da83:/interpreter/lib/src/libsndfile-1.0.25/tests/alaw_test.c diff --git a/interpreter/lib/src/libsndfile-1.0.25/tests/alaw_test.c b/interpreter/lib/src/libsndfile-1.0.25/tests/alaw_test.c new file mode 100644 index 0000000..e25101d --- /dev/null +++ b/interpreter/lib/src/libsndfile-1.0.25/tests/alaw_test.c @@ -0,0 +1,236 @@ +/* +** Copyright (C) 1999-2011 Erik de Castro Lopo +** +** 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 +#include +#include + +#if HAVE_UNISTD_H +#include +#endif + +#include + +#include "utils.h" + +#define BUFFER_SIZE (65536) + +static unsigned char alaw_encode (int sample) ; +static int alaw_decode (unsigned int alawbyte) ; + +static short short_buffer [BUFFER_SIZE] ; +static unsigned char alaw_buffer [BUFFER_SIZE] ; + +int +main (void) +{ SNDFILE *file ; + SF_INFO sfinfo ; + const char *filename ; + int k ; + + print_test_name ("alaw_test", "encoder") ; + + filename = "test.raw" ; + + sf_info_setup (&sfinfo, SF_FORMAT_RAW | SF_FORMAT_ALAW, 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 alaw 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 alaw 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, alaw_buffer, BUFFER_SIZE) != BUFFER_SIZE) + { printf ("sf_read_raw : ") ; + puts (sf_strerror (file)) ; + exit (1) ; + } ; + + for (k = 0 ; k < 0x10000 ; k++) + if (alaw_encode (short_buffer [k]) != alaw_buffer [k]) + { printf ("Encoder error : sample #%d (0x%02X should be 0x%02X)\n", k, alaw_buffer [k], alaw_encode (short_buffer [k])) ; + exit (1) ; + } ; + + sf_close (file) ; + + puts ("ok") ; + + print_test_name ("alaw_test", "decoder") ; + /* Now generate a file containing all possible 8 bit encoded + ** sample values and write it to disk as alaw 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++) + alaw_buffer [k] = k & 0xFF ; + + sf_write_raw (file, alaw_buffer, 256) ; + sf_close (file) ; + + /* Now open that file and compare the alaw 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] != alaw_decode (alaw_buffer [k])) + { printf ("Decoder error : sample #%d (0x%02X should be 0x%02X)\n", k, short_buffer [k], alaw_decode (alaw_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. +*/ + +/* +** A-law routines by Graeme W. Gill. +** Date: 93/5/7 +** +** References: +** 1) CCITT Recommendation G.711 +** +*/ + +#define ACLIP 31744 + +static +unsigned char alaw_encode (int sample) +{ static int exp_lut [128] = + { 1, 1, 2, 2, 3, 3, 3, 3, + 4, 4, 4, 4, 4, 4, 4, 4, + 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, + 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 Alawbyte ; + + /* Get the sample into sign-magnitude. */ + sign = ((~sample) >> 8) & 0x80 ; /* set aside the sign */ + if (sign == 0) + sample = -sample ; /* get magnitude */ + if (sample > ACLIP) + sample = ACLIP ; /* clip the magnitude */ + + /* Convert from 16 bit linear to ulaw. */ + if (sample >= 256) + { exponent = exp_lut [(sample >> 8) & 0x7F] ; + mantissa = ( sample >> ( exponent + 3 ) ) & 0x0F ; + Alawbyte = ((exponent << 4) | mantissa) ; + } + else + Alawbyte = (sample >> 4) ; + + Alawbyte ^= (sign ^ 0x55) ; + + return Alawbyte ; +} /* alaw_encode */ + +static +int alaw_decode (unsigned int Alawbyte) +{ static int exp_lut [8] = { 0, 264, 528, 1056, 2112, 4224, 8448, 16896 } ; + int sign, exponent, mantissa, sample ; + + Alawbyte ^= 0x55 ; + sign = (Alawbyte & 0x80) ; + Alawbyte &= 0x7f ; /* get magnitude */ + if (Alawbyte >= 16) + { exponent = (Alawbyte >> 4 ) & 0x07 ; + mantissa = Alawbyte & 0x0F ; + sample = exp_lut [exponent] + (mantissa << ( exponent + 3 )) ; + } + else + sample = (Alawbyte << 4) + 8 ; + if (sign == 0) + sample = -sample ; + + return sample ; +} /* alaw_decode */ +