376 lines
10 KiB
C
376 lines
10 KiB
C
/*
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** Copyright (C) 1999-2012 Erik de Castro Lopo <erikd@mega-nerd.com>
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU Lesser General Public License as published by
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** the Free Software Foundation; either version 2.1 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU Lesser General Public License for more details.
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**
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** You should have received a copy of the GNU Lesser General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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** Some of the information used to read NIST files was gleaned from
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** reading the code of Bill Schottstaedt's sndlib library
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** ftp://ccrma-ftp.stanford.edu/pub/Lisp/sndlib.tar.gz
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** However, no code from that package was used.
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*/
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#include "sfconfig.h"
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#include <stdio.h>
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#include <fcntl.h>
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#include <string.h>
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#include <ctype.h>
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#include "sndfile.h"
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#include "sfendian.h"
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#include "common.h"
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/*------------------------------------------------------------------------------
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*/
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#define NIST_HEADER_LENGTH 1024
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/*------------------------------------------------------------------------------
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** Private static functions.
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*/
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static int nist_close (SF_PRIVATE *psf) ;
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static int nist_write_header (SF_PRIVATE *psf, int calc_length) ;
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static int nist_read_header (SF_PRIVATE *psf) ;
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/*------------------------------------------------------------------------------
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*/
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int
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nist_open (SF_PRIVATE *psf)
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{ int error ;
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if (psf->file.mode == SFM_READ || (psf->file.mode == SFM_RDWR && psf->filelength > 0))
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{ if ((error = nist_read_header (psf)))
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return error ;
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} ;
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if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
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{ if (psf->is_pipe)
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return SFE_NO_PIPE_WRITE ;
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if ((SF_CONTAINER (psf->sf.format)) != SF_FORMAT_NIST)
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return SFE_BAD_OPEN_FORMAT ;
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psf->endian = SF_ENDIAN (psf->sf.format) ;
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if (psf->endian == 0 || psf->endian == SF_ENDIAN_CPU)
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psf->endian = (CPU_IS_BIG_ENDIAN) ? SF_ENDIAN_BIG : SF_ENDIAN_LITTLE ;
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psf->blockwidth = psf->bytewidth * psf->sf.channels ;
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psf->sf.frames = 0 ;
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if ((error = nist_write_header (psf, SF_FALSE)))
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return error ;
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psf->write_header = nist_write_header ;
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} ;
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psf->container_close = nist_close ;
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switch (SF_CODEC (psf->sf.format))
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{ case SF_FORMAT_PCM_S8 :
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error = pcm_init (psf) ;
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break ;
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case SF_FORMAT_PCM_16 :
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case SF_FORMAT_PCM_24 :
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case SF_FORMAT_PCM_32 :
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error = pcm_init (psf) ;
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break ;
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case SF_FORMAT_ULAW :
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error = ulaw_init (psf) ;
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break ;
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case SF_FORMAT_ALAW :
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error = alaw_init (psf) ;
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break ;
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default : error = SFE_UNIMPLEMENTED ;
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break ;
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} ;
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return error ;
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} /* nist_open */
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/*------------------------------------------------------------------------------
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*/
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static char bad_header [] =
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{ 'N', 'I', 'S', 'T', '_', '1', 'A', 0x0d, 0x0a,
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' ', ' ', ' ', '1', '0', '2', '4', 0x0d, 0x0a,
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0
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} ;
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static int
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nist_read_header (SF_PRIVATE *psf)
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{ char psf_header [NIST_HEADER_LENGTH + 2] ;
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int bitwidth = 0, count, encoding ;
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unsigned bytes = 0 ;
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char str [64], *cptr ;
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long samples ;
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if (sizeof (psf->header) <= NIST_HEADER_LENGTH)
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return SFE_INTERNAL ;
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/* Go to start of file and read in the whole header. */
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psf_binheader_readf (psf, "pb", 0, psf_header, NIST_HEADER_LENGTH) ;
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/* Header is a string, so make sure it is null terminated. */
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psf_header [NIST_HEADER_LENGTH] = 0 ;
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/* Now trim the header after the end marker. */
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if ((cptr = strstr (psf_header, "end_head")))
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{ cptr += strlen ("end_head") + 1 ;
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cptr [0] = 0 ;
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} ;
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if (strstr (psf_header, bad_header) == psf_header)
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return SFE_NIST_CRLF_CONVERISON ;
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/* Make sure its a NIST file. */
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if (strstr (psf_header, "NIST_1A\n") != psf_header)
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{ psf_log_printf (psf, "Not a NIST file.\n") ;
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return SFE_NIST_BAD_HEADER ;
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} ;
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if (sscanf (psf_header, "NIST_1A\n%d\n", &count) == 1)
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psf->dataoffset = count ;
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else
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{ psf_log_printf (psf, "*** Suspicious header length.\n") ;
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psf->dataoffset = NIST_HEADER_LENGTH ;
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} ;
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/* Determine sample encoding, start by assuming PCM. */
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encoding = SF_FORMAT_PCM_U8 ;
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if ((cptr = strstr (psf_header, "sample_coding -s")))
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{ sscanf (cptr, "sample_coding -s%d %63s", &count, str) ;
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if (strcmp (str, "pcm") == 0)
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{ /* Correct this later when we find out the bitwidth. */
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encoding = SF_FORMAT_PCM_U8 ;
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}
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else if (strcmp (str, "alaw") == 0)
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encoding = SF_FORMAT_ALAW ;
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else if ((strcmp (str, "ulaw") == 0) || (strcmp (str, "mu-law") == 0))
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encoding = SF_FORMAT_ULAW ;
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else
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{ psf_log_printf (psf, "*** Unknown encoding : %s\n", str) ;
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encoding = 0 ;
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} ;
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} ;
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if ((cptr = strstr (psf_header, "channel_count -i ")) != NULL)
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sscanf (cptr, "channel_count -i %d", &(psf->sf.channels)) ;
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if ((cptr = strstr (psf_header, "sample_rate -i ")) != NULL)
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sscanf (cptr, "sample_rate -i %d", &(psf->sf.samplerate)) ;
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if ((cptr = strstr (psf_header, "sample_count -i ")) != NULL)
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{ sscanf (cptr, "sample_count -i %ld", &samples) ;
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psf->sf.frames = samples ;
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} ;
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if ((cptr = strstr (psf_header, "sample_n_bytes -i ")) != NULL)
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sscanf (cptr, "sample_n_bytes -i %d", &(psf->bytewidth)) ;
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/* Default endian-ness (for 8 bit, u-law, A-law. */
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psf->endian = (CPU_IS_BIG_ENDIAN) ? SF_ENDIAN_BIG : SF_ENDIAN_LITTLE ;
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/* This is where we figure out endian-ness. */
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if ((cptr = strstr (psf_header, "sample_byte_format -s"))
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&& sscanf (cptr, "sample_byte_format -s%u %8s", &bytes, str) == 2)
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{
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if (bytes != strlen (str))
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psf_log_printf (psf, "Weird sample_byte_format : strlen '%s' != %d\n", str, bytes) ;
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if (bytes > 1)
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{ if (psf->bytewidth == 0)
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psf->bytewidth = bytes ;
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else if (psf->bytewidth - bytes != 0)
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{ psf_log_printf (psf, "psf->bytewidth (%d) != bytes (%d)\n", psf->bytewidth, bytes) ;
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return SFE_NIST_BAD_ENCODING ;
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} ;
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if (strcmp (str, "01") == 0)
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psf->endian = SF_ENDIAN_LITTLE ;
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else if (strcmp (str, "10") == 0)
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psf->endian = SF_ENDIAN_BIG ;
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else
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{ psf_log_printf (psf, "Weird endian-ness : %s\n", str) ;
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return SFE_NIST_BAD_ENCODING ;
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} ;
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} ;
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psf->sf.format |= psf->endian ;
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} ;
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if ((cptr = strstr (psf_header, "sample_sig_bits -i ")))
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sscanf (cptr, "sample_sig_bits -i %d", &bitwidth) ;
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if (strstr (psf_header, "channels_interleaved -s5 FALSE"))
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{ psf_log_printf (psf, "Non-interleaved data unsupported.\n", str) ;
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return SFE_NIST_BAD_ENCODING ;
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} ;
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psf->blockwidth = psf->sf.channels * psf->bytewidth ;
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psf->datalength = psf->filelength - psf->dataoffset ;
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psf_fseek (psf, psf->dataoffset, SEEK_SET) ;
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if (encoding == SF_FORMAT_PCM_U8)
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{ switch (psf->bytewidth)
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{ case 1 :
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psf->sf.format |= SF_FORMAT_PCM_S8 ;
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break ;
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case 2 :
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psf->sf.format |= SF_FORMAT_PCM_16 ;
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break ;
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case 3 :
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psf->sf.format |= SF_FORMAT_PCM_24 ;
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break ;
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case 4 :
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psf->sf.format |= SF_FORMAT_PCM_32 ;
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break ;
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default : break ;
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} ;
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}
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else if (encoding != 0)
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psf->sf.format |= encoding ;
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else
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return SFE_UNIMPLEMENTED ;
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/* Sanitize psf->sf.format. */
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switch (SF_CODEC (psf->sf.format))
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{ case SF_FORMAT_ULAW :
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case SF_FORMAT_ALAW :
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case SF_FORMAT_PCM_U8 :
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/* Blank out endian bits. */
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psf->sf.format = SF_FORMAT_NIST | SF_CODEC (psf->sf.format) ;
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break ;
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default :
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break ;
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} ;
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return 0 ;
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} /* nist_read_header */
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static int
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nist_close (SF_PRIVATE *psf)
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{
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if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
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nist_write_header (psf, SF_TRUE) ;
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return 0 ;
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} /* nist_close */
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/*=========================================================================
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*/
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static int
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nist_write_header (SF_PRIVATE *psf, int calc_length)
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{ const char *end_str ;
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long samples ;
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sf_count_t current ;
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current = psf_ftell (psf) ;
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if (calc_length)
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{ psf->filelength = psf_get_filelen (psf) ;
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psf->datalength = psf->filelength - psf->dataoffset ;
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if (psf->dataend)
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psf->datalength -= psf->filelength - psf->dataend ;
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if (psf->bytewidth > 0)
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psf->sf.frames = psf->datalength / (psf->bytewidth * psf->sf.channels) ;
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} ;
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if (psf->endian == SF_ENDIAN_BIG)
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end_str = "10" ;
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else if (psf->endian == SF_ENDIAN_LITTLE)
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end_str = "01" ;
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else
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end_str = "error" ;
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/* Clear the whole header. */
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memset (psf->header, 0, sizeof (psf->header)) ;
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psf->headindex = 0 ;
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psf_fseek (psf, 0, SEEK_SET) ;
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psf_asciiheader_printf (psf, "NIST_1A\n 1024\n") ;
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psf_asciiheader_printf (psf, "channel_count -i %d\n", psf->sf.channels) ;
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psf_asciiheader_printf (psf, "sample_rate -i %d\n", psf->sf.samplerate) ;
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switch (SF_CODEC (psf->sf.format))
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{ case SF_FORMAT_PCM_S8 :
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psf_asciiheader_printf (psf, "sample_coding -s3 pcm\n") ;
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psf_asciiheader_printf (psf, "sample_n_bytes -i 1\n"
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"sample_sig_bits -i 8\n") ;
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break ;
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case SF_FORMAT_PCM_16 :
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case SF_FORMAT_PCM_24 :
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case SF_FORMAT_PCM_32 :
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psf_asciiheader_printf (psf, "sample_n_bytes -i %d\n", psf->bytewidth) ;
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psf_asciiheader_printf (psf, "sample_sig_bits -i %d\n", psf->bytewidth * 8) ;
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psf_asciiheader_printf (psf, "sample_coding -s3 pcm\n"
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"sample_byte_format -s%d %s\n", psf->bytewidth, end_str) ;
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break ;
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case SF_FORMAT_ALAW :
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psf_asciiheader_printf (psf, "sample_coding -s4 alaw\n") ;
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psf_asciiheader_printf (psf, "sample_n_bytes -s1 1\n") ;
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break ;
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case SF_FORMAT_ULAW :
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psf_asciiheader_printf (psf, "sample_coding -s4 ulaw\n") ;
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psf_asciiheader_printf (psf, "sample_n_bytes -s1 1\n") ;
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break ;
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default : return SFE_UNIMPLEMENTED ;
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} ;
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psf->dataoffset = NIST_HEADER_LENGTH ;
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/* Fix this */
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samples = psf->sf.frames ;
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psf_asciiheader_printf (psf, "sample_count -i %ld\n", samples) ;
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psf_asciiheader_printf (psf, "end_head\n") ;
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/* Zero fill to dataoffset. */
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psf_binheader_writef (psf, "z", (size_t) (NIST_HEADER_LENGTH - psf->headindex)) ;
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psf_fwrite (psf->header, psf->headindex, 1, psf) ;
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if (psf->error)
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return psf->error ;
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if (current > 0)
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psf_fseek (psf, current, SEEK_SET) ;
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return psf->error ;
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} /* nist_write_header */
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