ref: 46d58fc082a8537f9de79342cd7d7d24974c984d
dir: /common/libsndfile/src/nist.c/
/*
** Copyright (C) 1999-2002 Erik de Castro Lopo <[email protected]>
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU Lesser General Public License as published by
** the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser 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.
*/
/*
** Some of the information used to read NIST files was gleaned from
** reading the code of Bill Schottstaedt's sndlib library
** ftp://ccrma-ftp.stanford.edu/pub/Lisp/sndlib.tar.gz
** However, no code from that package was used.
*/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <ctype.h>
#include "sndfile.h"
#include "config.h"
#include "sfendian.h"
#include "common.h"
/*------------------------------------------------------------------------------
*/
#define NIST_HEADER_LENGTH 1024
/*------------------------------------------------------------------------------
** Private static functions.
*/
static int nist_close (SF_PRIVATE *psf) ;
static int nist_write_header (SF_PRIVATE *psf) ;
static int nist_read_header (SF_PRIVATE *psf) ;
/*------------------------------------------------------------------------------
*/
int
nist_open (SF_PRIVATE *psf)
{ int subformat, error ;
if (psf->mode == SFM_READ || (psf->mode == SFM_RDWR && psf->filelength > 0))
{ if ((error = nist_read_header (psf)))
return error ;
} ;
subformat = psf->sf.format & SF_FORMAT_SUBMASK ;
if (psf->mode == SFM_WRITE || psf->mode == SFM_RDWR)
{ if ((psf->sf.format & SF_FORMAT_TYPEMASK) != SF_FORMAT_NIST)
return SFE_BAD_OPEN_FORMAT ;
psf->endian = psf->sf.format & SF_FORMAT_ENDMASK ;
if (psf->endian == 0 || psf->endian == SF_ENDIAN_CPU)
psf->endian = (CPU_IS_BIG_ENDIAN) ? SF_ENDIAN_BIG : SF_ENDIAN_LITTLE ;
psf->blockwidth = psf->bytewidth * psf->sf.channels ;
if ((error = nist_write_header (psf)))
return error ;
psf->write_header = nist_write_header ;
} ;
psf->close = nist_close ;
switch (psf->sf.format & SF_FORMAT_SUBMASK)
{ case SF_FORMAT_PCM_S8 :
psf->chars = SF_CHARS_SIGNED ;
error = pcm_init (psf) ;
break ;
case SF_FORMAT_PCM_16 :
case SF_FORMAT_PCM_24 :
case SF_FORMAT_PCM_32 :
error = pcm_init (psf) ;
break ;
case SF_FORMAT_ULAW :
error = ulaw_init (psf) ;
break ;
case SF_FORMAT_ALAW :
error = alaw_init (psf) ;
break ;
default : error = SFE_UNIMPLEMENTED ;
break ;
} ;
return error ;
} /* nist_open */
/*------------------------------------------------------------------------------
*/
static int
nist_read_header (SF_PRIVATE *psf)
{ char *psf_header ;
int bitwidth = 0, bytes = 0, count, encoding ;
char str [64], *cptr ;
long samples ;
psf->sf.format = SF_FORMAT_NIST ;
psf_header = (char*) psf->header ;
if (sizeof (psf->header) <= NIST_HEADER_LENGTH)
return SFE_INTERNAL ;
/* Go to start of file and read in the whole header. */
psf_binheader_readf (psf, "pb", 0, psf_header, NIST_HEADER_LENGTH) ;
/* Header is a string, so make sure it is null terminated. */
psf_header [NIST_HEADER_LENGTH] = 0 ;
/* Now trim the header after the end marker. */
if ((cptr = strstr (psf_header, "end_head")))
{ cptr += strlen ("end_head") + 1 ;
cptr [0] = 0 ;
} ;
psf_log_printf (psf, psf_header) ;
/* Make sure its a NIST file. */
if (strstr (psf_header, "NIST_1A\n 1024\n") != psf_header)
{ printf ("Not a NIST file.\n") ;
puts (psf_header) ;
exit (1) ;
} ;
/* Determine sample encoding, start by assuming PCM. */
encoding = SF_FORMAT_PCM_U8 ;
if ((cptr = strstr (psf_header, "sample_coding -s")))
{ sscanf (cptr, "sample_coding -s%d %63s", &count, str) ;
if (strcmp (str, "pcm") == 0)
encoding = SF_FORMAT_PCM_U8 ;
else if (strcmp (str, "alaw") == 0)
encoding = SF_FORMAT_ALAW ;
else if ((strcmp (str, "ulaw") == 0) || (strcmp (str, "mu-law") == 0))
encoding = SF_FORMAT_ULAW ;
else
{ psf_log_printf (psf, "*** Unknown encoding : %s\n", str) ;
encoding = 0 ;
} ;
} ;
if ((cptr = strstr (psf_header, "channel_count -i ")))
sscanf (cptr, "channel_count -i %d", &(psf->sf.channels)) ;
if ((cptr = strstr (psf_header, "sample_rate -i ")))
sscanf (cptr, "sample_rate -i %d", &(psf->sf.samplerate)) ;
if ((cptr = strstr (psf_header, "sample_count -i ")))
{ sscanf (psf_header, "sample_count -i %ld", &samples) ;
psf->sf.samples = samples ;
} ;
if ((cptr = strstr (psf_header, "sample_n_bytes -i ")))
sscanf (cptr, "sample_n_bytes -i %d", &(psf->bytewidth)) ;
/* Default endian-ness (for 8 bit, u-law, A-law. */
psf->endian = (CPU_IS_BIG_ENDIAN) ? SF_ENDIAN_BIG : SF_ENDIAN_LITTLE ;
/* This is where we figure out endian-ness. */
if ((cptr = strstr (psf_header, "sample_byte_format -s")))
{ sscanf (cptr, "sample_byte_format -s%d %8s", &bytes, str) ;
if (bytes > 1)
{ if (psf->bytewidth == 0)
psf->bytewidth = bytes ;
else if (psf->bytewidth != bytes)
{ psf_log_printf (psf, "psf->bytewidth (%d) != bytes (%d)\n", psf->bytewidth, bytes) ;
return SFE_NIST_BAD_ENCODING ;
} ;
if (strstr (str, "01") == str)
psf->endian = SF_ENDIAN_LITTLE ;
else if (strstr (str, "10"))
psf->endian = SF_ENDIAN_BIG ;
else
{ psf_log_printf (psf, "Weird endian-ness : %s\n", str) ;
return SFE_NIST_BAD_ENCODING ;
} ;
} ;
psf->sf.format |= psf->endian ;
} ;
if ((cptr = strstr (psf_header, "sample_sig_bits -i ")))
sscanf (cptr, "sample_sig_bits -i %d", &bitwidth) ;
if (strstr (psf_header, "channels_interleaved -s5 FALSE"))
{ psf_log_printf (psf, "Non-interleaved data unsupported.\n", str) ;
return SFE_NIST_BAD_ENCODING ;
} ;
psf->dataoffset = NIST_HEADER_LENGTH ;
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
psf->datalength = psf->filelength - psf->dataoffset ;
psf->close = nist_close ;
psf_fseek (psf->filedes, psf->dataoffset, SEEK_SET) ;
if (encoding == SF_FORMAT_PCM_U8)
{ switch (psf->bytewidth)
{ case 1 :
psf->chars = SF_CHARS_SIGNED ;
psf->sf.format |= SF_FORMAT_PCM_S8 ;
break ;
case 2 :
psf->sf.format |= SF_FORMAT_PCM_16 ;
break ;
case 3 :
psf->sf.format |= SF_FORMAT_PCM_24 ;
break ;
case 4 :
psf->sf.format |= SF_FORMAT_PCM_32 ;
break ;
default : break ;
} ;
}
else if (encoding != 0)
psf->sf.format |= encoding ;
else
return SFE_UNIMPLEMENTED ;
return 0 ;
} /* nist_read_header */
static int
nist_close (SF_PRIVATE *psf)
{
if (psf->mode == SFM_WRITE || psf->mode == SFM_RDWR)
{ /* Now we know for certain the length of the file we can
** re-write correct values for the datasize header element.
*/
psf_fseek (psf->filedes, 0, SEEK_END) ;
psf->filelength = psf_ftell (psf->filedes) ;
psf->dataoffset = NIST_HEADER_LENGTH ;
psf->datalength = psf->filelength - psf->dataoffset ;
psf->sf.samples = psf->datalength / psf->blockwidth ;
nist_write_header (psf) ;
} ;
return 0 ;
} /* nist_close */
/*=========================================================================
*/
static int
nist_write_header (SF_PRIVATE *psf)
{ char *end_str ;
long samples ;
if (psf->endian == SF_ENDIAN_BIG)
end_str = "10" ;
else if (psf->endian == SF_ENDIAN_LITTLE)
end_str = "01" ;
else
end_str = "error" ;
/* Clear the whole header. */
memset (psf->header, 0, sizeof (psf->header)) ;
psf->headindex = 0 ;
psf_fseek (psf->filedes, 0, SEEK_SET) ;
psf_asciiheader_printf (psf, "NIST_1A\n 1024\n") ;
psf_asciiheader_printf (psf, "channel_count -i %d\n", psf->sf.channels) ;
psf_asciiheader_printf (psf, "sample_rate -i %d\n", psf->sf.samplerate) ;
switch (psf->sf.format & SF_FORMAT_SUBMASK)
{ case SF_FORMAT_PCM_S8 :
psf_asciiheader_printf (psf, "sample_coding -s3 pcm\n") ;
psf_asciiheader_printf (psf, "sample_n_bytes -i 1\n"
"sample_sig_bits -i 8\n") ;
break ;
case SF_FORMAT_PCM_16 :
case SF_FORMAT_PCM_24 :
case SF_FORMAT_PCM_32 :
psf_asciiheader_printf (psf, "sample_n_bytes -i %d\n", psf->bytewidth) ;
psf_asciiheader_printf (psf, "sample_sig_bits -i %d\n", psf->bytewidth * 8) ;
psf_asciiheader_printf (psf, "sample_coding -s3 pcm\n"
"sample_byte_format -s%d %s\n", psf->bytewidth, end_str) ;
break ;
case SF_FORMAT_ALAW :
psf_asciiheader_printf (psf, "sample_coding -s4 alaw\n") ;
psf_asciiheader_printf (psf, "sample_n_bytes -s1 1\n") ;
break ;
case SF_FORMAT_ULAW :
psf_asciiheader_printf (psf, "sample_coding -s4 ulaw\n") ;
psf_asciiheader_printf (psf, "sample_n_bytes -s1 1\n") ;
break ;
default : return SFE_UNIMPLEMENTED ;
} ;
psf->dataoffset = NIST_HEADER_LENGTH ;
/* Fix this */
samples = psf->sf.samples ;
psf_asciiheader_printf (psf, "sample_count -i %ld\n", samples) ;
psf_asciiheader_printf (psf, "end_head\n") ;
/* Zero fill to dataoffset. */
psf_binheader_writef (psf, "z", NIST_HEADER_LENGTH - psf->headindex) ;
psf_fwrite (psf->header, psf->headindex, 1, psf->filedes) ;
return 0 ;
} /* nist_write_header */