/*

** Copyright (C) 2008-2016 Erik de Castro Lopo <erikd@mega-nerd.com>

**

** All rights reserved.

**

** Redistribution and use in source and binary forms, with or without

** modification, are permitted provided that the following conditions are

** met:

**

**     * Redistributions of source code must retain the above copyright

**       notice, this list of conditions and the following disclaimer.

**     * Redistributions in binary form must reproduce the above copyright

**       notice, this list of conditions and the following disclaimer in

**       the documentation and/or other materials provided with the

**       distribution.

**     * Neither the author nor the names of any contributors may be used

**       to endorse or promote products derived from this software without

**       specific prior written permission.

**

** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED

** TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

** PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR

** CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

** EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

** PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

** OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

** OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

** ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <ctype.h>

#include <float.h>

#include <sndfile.h>

#define	BLOCK_SIZE 4096

#ifdef DBL_DECIMAL_DIG

	#define OP_DBL_Digs (DBL_DECIMAL_DIG)

#else

	#ifdef DECIMAL_DIG

		#define OP_DBL_Digs (DECIMAL_DIG)

	#else

		#define OP_DBL_Digs (DBL_DIG + 3)

	#endif

#endif

static void

print_usage (char *progname)

{	printf ("\nUsage : %s [--full-precision] <input file> <output file>\n", progname) ;

	puts ("\n"

		"    Where the output file will contain a line for each frame\n"

		"    and a column for each channel.\n"

		) ;

} /* print_usage */

static void

convert_to_text (SNDFILE * infile, FILE * outfile, int channels, int full_precision)

{	float buf [BLOCK_SIZE] ;

	sf_count_t frames ;

	int k, m, readcount ;

	frames = BLOCK_SIZE / channels ;

	while ((readcount = sf_readf_float (infile, buf, frames)) > 0)

	{	for (k = 0 ; k < readcount ; k++)

		{	for (m = 0 ; m < channels ; m++)

				if (full_precision)

					fprintf (outfile, " %.*e", OP_DBL_Digs - 1, buf [k * channels + m]) ;

				else

					fprintf (outfile, " % 12.10f", buf [k * channels + m]) ;

			fprintf (outfile, "\n") ;

			} ;

		} ;

	return ;

} /* convert_to_text */

int

main (int argc, char * argv [])

{	char 		*progname, *infilename, *outfilename ;

	SNDFILE		*infile = NULL ;

	FILE		*outfile = NULL ;

	SF_INFO		sfinfo ;

	int		full_precision = 0 ;

	progname = strrchr (argv [0], '/') ;

	progname = progname ? progname + 1 : argv [0] ;

	switch (argc)

	{	case 4 :

			if (!strcmp ("--full-precision", argv [3]))

			{	print_usage (progname) ;

				return 1 ;

				} ;

			full_precision = 1 ;

			argv++ ;

		case 3 :

			break ;

		default:

			print_usage (progname) ;

			return 1 ;

		} ;

	infilename = argv [1] ;

	outfilename = argv [2] ;

	if (strcmp (infilename, outfilename) == 0)

	{	printf ("Error : Input and output filenames are the same.\n\n") ;

		print_usage (progname) ;

		return 1 ;

		} ;

	if (infilename [0] == '-')

	{	printf ("Error : Input filename (%s) looks like an option.\n\n", infilename) ;

		print_usage (progname) ;

		return 1 ;

		} ;

	if (outfilename [0] == '-')

	{	printf ("Error : Output filename (%s) looks like an option.\n\n", outfilename) ;

		print_usage (progname) ;

		return 1 ;

		} ;

	memset (&sfinfo, 0, sizeof (sfinfo)) ;

	if ((infile = sf_open (infilename, SFM_READ, &sfinfo)) == NULL)

	{	printf ("Not able to open input file %s.\n", infilename) ;

		puts (sf_strerror (NULL)) ;

		return 1 ;

		} ;

	/* Open the output file. */

	if ((outfile = fopen (outfilename, "w")) == NULL)

	{	printf ("Not able to open output file %s : %s\n", outfilename, sf_strerror (NULL)) ;

		return 1 ;

		} ;

	fprintf (outfile, "# Converted from file %s.\n", infilename) ;

	fprintf (outfile, "# Channels %d, Sample rate %d\n", sfinfo.channels, sfinfo.samplerate) ;

	convert_to_text (infile, outfile, sfinfo.channels, full_precision) ;

	sf_close (infile) ;

	fclose (outfile) ;

	return 0 ;

} /* main */