/*
** Copyright (C) 1999-2016 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 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 "sfconfig.h"
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <ctype.h>
#include "sndfile.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, int calc_length) ;
static int nist_read_header (SF_PRIVATE *psf) ;
/*------------------------------------------------------------------------------
*/
int
nist_open (SF_PRIVATE *psf)
{ int error ;
if (psf->file.mode == SFM_READ || (psf->file.mode == SFM_RDWR && psf->filelength > 0))
{ if ((error = nist_read_header (psf)))
return error ;
} ;
if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
{ if (psf->is_pipe)
return SFE_NO_PIPE_WRITE ;
if ((SF_CONTAINER (psf->sf.format)) != SF_FORMAT_NIST)
return SFE_BAD_OPEN_FORMAT ;
psf->endian = SF_ENDIAN (psf->sf.format) ;
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 ;
psf->sf.frames = 0 ;
if ((error = nist_write_header (psf, SF_FALSE)))
return error ;
psf->write_header = nist_write_header ;
} ;
psf->container_close = nist_close ;
switch (SF_CODEC (psf->sf.format))
{ case SF_FORMAT_PCM_S8 :
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 char bad_header [] =
{ 'N', 'I', 'S', 'T', '_', '1', 'A', 0x0d, 0x0a,
' ', ' ', ' ', '1', '0', '2', '4', 0x0d, 0x0a,
0
} ;
static int
nist_read_header (SF_PRIVATE *psf)
{ char psf_header [NIST_HEADER_LENGTH + 2] ;
int bitwidth = 0, count, encoding ;
unsigned bytes = 0 ;
char str [64], *cptr ;
long samples ;
/* 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 ;
} ;
if (strstr (psf_header, bad_header) == psf_header)
return SFE_NIST_CRLF_CONVERISON ;
/* Make sure its a NIST file. */
if (strstr (psf_header, "NIST_1A\n") != psf_header)
{ psf_log_printf (psf, "Not a NIST file.\n") ;
return SFE_NIST_BAD_HEADER ;
} ;
if (sscanf (psf_header, "NIST_1A\n%d\n", &count) == 1)
psf->dataoffset = count ;
else
{ psf_log_printf (psf, "*** Suspicious header length.\n") ;
psf->dataoffset = NIST_HEADER_LENGTH ;
} ;
/* 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)
{ /* Correct this later when we find out the bitwidth. */
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 ")) != NULL)
sscanf (cptr, "channel_count -i %d", &(psf->sf.channels)) ;
if ((cptr = strstr (psf_header, "sample_rate -i ")) != NULL)
sscanf (cptr, "sample_rate -i %d", &(psf->sf.samplerate)) ;
if ((cptr = strstr (psf_header, "sample_count -i ")) != NULL)
{ sscanf (cptr, "sample_count -i %ld", &samples) ;
psf->sf.frames = samples ;
} ;
if ((cptr = strstr (psf_header, "sample_n_bytes -i ")) != NULL)
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%u %8s", &bytes, str) == 2)
{
if (bytes != strlen (str))
psf_log_printf (psf, "Weird sample_byte_format : strlen '%s' != %d\n", str, bytes) ;
if (bytes > 1)
{ if (psf->bytewidth == 0)
psf->bytewidth = bytes ;
else if (psf->bytewidth - bytes != 0)
{ psf_log_printf (psf, "psf->bytewidth (%d) != bytes (%d)\n", psf->bytewidth, bytes) ;
return SFE_NIST_BAD_ENCODING ;
} ;
if (strcmp (str, "01") == 0)
psf->endian = SF_ENDIAN_LITTLE ;
else if (strcmp (str, "10") == 0)
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->blockwidth = psf->sf.channels * psf->bytewidth ;
psf->datalength = psf->filelength - psf->dataoffset ;
psf_fseek (psf, psf->dataoffset, SEEK_SET) ;
if (encoding == SF_FORMAT_PCM_U8)
{ switch (psf->bytewidth)
{ case 1 :
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 ;
/* Sanitize psf->sf.format. */
switch (SF_CODEC (psf->sf.format))
{ case SF_FORMAT_ULAW :
case SF_FORMAT_ALAW :
case SF_FORMAT_PCM_U8 :
/* Blank out endian bits. */
psf->sf.format = SF_FORMAT_NIST | SF_CODEC (psf->sf.format) ;
break ;
default :
break ;
} ;
return 0 ;
} /* nist_read_header */
static int
nist_close (SF_PRIVATE *psf)
{
if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
nist_write_header (psf, SF_TRUE) ;
return 0 ;
} /* nist_close */
/*=========================================================================
*/
static int
nist_write_header (SF_PRIVATE *psf, int calc_length)
{ const char *end_str ;
long samples ;
sf_count_t current ;
current = psf_ftell (psf) ;
if (calc_length)
{ psf->filelength = psf_get_filelen (psf) ;
psf->datalength = psf->filelength - psf->dataoffset ;
if (psf->dataend)
psf->datalength -= psf->filelength - psf->dataend ;
if (psf->bytewidth > 0)
psf->sf.frames = psf->datalength / (psf->bytewidth * psf->sf.channels) ;
} ;
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.ptr, 0, psf->header.len) ;
psf->header.indx = 0 ;
psf_fseek (psf, 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 (SF_CODEC (psf->sf.format))
{ 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.frames ;
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", (size_t) (NIST_HEADER_LENGTH - psf->header.indx)) ;
psf_fwrite (psf->header.ptr, psf->header.indx, 1, psf) ;
if (psf->error)
return psf->error ;
if (current > 0)
psf_fseek (psf, current, SEEK_SET) ;
return psf->error ;
} /* nist_write_header */