diff src/libsndfile-1.0.27/examples/sndfile-loopify.c @ 125:cd6cdf86811e

Current libsndfile source

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/libsndfile-1.0.27/examples/sndfile-loopify.c	Tue Oct 18 13:22:47 2016 +0100
@@ -0,0 +1,182 @@
+/*
+** Copyright (C) 1999-2015 Erik de Castro Lopo <[e-mail]>
+**
+** 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.
+*/
+
+/*
+** A quick/rough hack to add SF_INSTRUMENT data to a file. It compiles, but
+** no guarantees beyond that. Happy to receive patches to fix/improve it.
+**
+** Code for this was stolen from programs/sndfile-convert.c and related code.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#include <sndfile.h>
+
+#include "common.h"
+
+#define BUFFER_LEN		(1 << 14)
+
+
+typedef	struct
+{	char	*infilename, *outfilename ;
+	SF_INFO	infileinfo, outfileinfo ;
+} OptionData ;
+
+const char * program_name (const char * argv0) ;
+static void sfe_copy_data_int (SNDFILE *outfile, SNDFILE *infile, int channels) ;
+static void add_instrument_data (SNDFILE *outfile, const SF_INFO * in_info) ;
+
+static void
+usage_exit (const char *progname)
+{
+	printf ("\nUsage : %s <input file> <output file>\n", progname) ;
+	puts ("") ;
+	exit (1) ;
+} /* usage_exit */
+
+int
+main (int argc, char * argv [])
+{	const char	*progname, *infilename, *outfilename ;
+	SNDFILE		*infile = NULL, *outfile = NULL ;
+	SF_INFO		in_sfinfo, out_sfinfo ;
+
+	progname = program_name (argv [0]) ;
+
+	if (argc < 3 || argc > 5)
+		usage_exit (progname) ;
+
+	infilename = argv [argc-2] ;
+	outfilename = argv [argc-1] ;
+
+	if (strcmp (infilename, outfilename) == 0)
+	{	printf ("Error : Input and output filenames are the same.\n\n") ;
+		usage_exit (progname) ;
+		} ;
+
+	if (strlen (infilename) > 1 && infilename [0] == '-')
+	{	printf ("Error : Input filename (%s) looks like an option.\n\n", infilename) ;
+		usage_exit (progname) ;
+		} ;
+
+	if (outfilename [0] == '-')
+	{	printf ("Error : Output filename (%s) looks like an option.\n\n", outfilename) ;
+		usage_exit (progname) ;
+		} ;
+
+	memset (&in_sfinfo, 0, sizeof (in_sfinfo)) ;
+
+	if ((infile = sf_open (infilename, SFM_READ, &in_sfinfo)) == NULL)
+	{	printf ("Not able to open input file %s.\n", infilename) ;
+		puts (sf_strerror (NULL)) ;
+		return 1 ;
+		} ;
+
+	memcpy (&out_sfinfo, &in_sfinfo, sizeof (out_sfinfo)) ;
+	/* Open the output file. */
+	if ((outfile = sf_open (outfilename, SFM_WRITE, &out_sfinfo)) == NULL)
+	{	printf ("Not able to open output file %s : %s\n", outfilename, sf_strerror (NULL)) ;
+		return 1 ;
+		} ;
+
+	/* Add the loop data */
+	add_instrument_data (outfile, &in_sfinfo) ;
+
+	/* Copy the audio data */
+	sfe_copy_data_int (outfile, infile, in_sfinfo.channels) ;
+
+	sf_close (infile) ;
+	sf_close (outfile) ;
+
+	return 0 ;
+} /* main */
+
+const char *
+program_name (const char * argv0)
+{	const char * tmp ;
+
+	tmp = strrchr (argv0, '/') ;
+	argv0 = tmp ? tmp + 1 : argv0 ;
+
+	/* Remove leading libtool name mangling. */
+	if (strstr (argv0, "lt-") == argv0)
+		return argv0 + 3 ;
+
+	return argv0 ;
+} /* program_name */
+
+static void
+sfe_copy_data_int (SNDFILE *outfile, SNDFILE *infile, int channels)
+{	static int	data [BUFFER_LEN] ;
+	int		frames, readcount ;
+
+	frames = BUFFER_LEN / channels ;
+	readcount = frames ;
+
+	while (readcount > 0)
+	{	readcount = sf_readf_int (infile, data, frames) ;
+		sf_writef_int (outfile, data, readcount) ;
+		} ;
+
+	return ;
+} /* sfe_copy_data_int */
+
+static void
+add_instrument_data (SNDFILE *file, const SF_INFO *info)
+{	SF_INSTRUMENT instr ;
+
+	memset (&instr, 0, sizeof (instr)) ;
+
+	instr.gain = 1 ;
+	instr.basenote = 0 ;
+	instr.detune = 0 ;
+	instr.velocity_lo = 0 ;
+	instr.velocity_hi = 0 ;
+	instr.key_lo = 0 ;
+	instr.key_hi = 0 ;
+	instr.loop_count = 1 ;
+
+	instr.loops [0].mode = SF_LOOP_FORWARD ;
+	instr.loops [0].start = 0 ;
+	instr.loops [0].end = info->frames ;
+	instr.loops [0].count = 0 ;
+
+	if (sf_command (file, SFC_SET_INSTRUMENT, &instr, sizeof (instr)) == SF_FALSE)
+	{	printf ("\n\nLine %d : sf_command (SFC_SET_INSTRUMENT) failed.\n\n", __LINE__) ;
+		exit (1) ;
+		} ;
+
+	return ;
+} /* add_instrument_data */
+