comparison src/libsamplerate-0.1.9/examples/sndfile-resample.c @ 126:4a7071416412

Current libsamplerate source

+/*
+** Copyright (c) 2002-2016, Erik de Castro Lopo <[e-mail]>
+** All rights reserved.
+**
+** This code is released under 2-clause BSD license. Please see the
+** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
+*/
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <math.h>
+
+#if (HAVE_SNDFILE)
+
+#include <samplerate.h>
+#include <sndfile.h>
+
+#define DEFAULT_CONVERTER SRC_SINC_MEDIUM_QUALITY
+
+#define	BUFFER_LEN		4096	/*-(1<<16)-*/
+
+static void usage_exit (const char *progname) ;
+static sf_count_t sample_rate_convert (SNDFILE *infile, SNDFILE *outfile, int converter, double src_ratio, int channels, double * gain, int normalize) ;
+static double apply_gain (float * data, long frames, int channels, double max, double gain) ;
+
+int
+main (int argc, char *argv [])
+{	SNDFILE	*infile, *outfile = NULL ;
+	SF_INFO sfinfo ;
+
+	int normalize = 1 ;
+	sf_count_t	count ;
+	double		src_ratio = -1.0, gain = 1.0 ;
+	int			new_sample_rate = -1, k, converter, max_speed = SF_FALSE ;
+
+	if (argc == 2 && strcmp (argv [1], "--version") == 0)
+	{	char buffer [64], *cptr ;
+
+		if ((cptr = strrchr (argv [0], '/')) != NULL)
+			argv [0] = cptr + 1 ;
+		if ((cptr = strrchr (argv [0], '\\')) != NULL)
+			argv [0] = cptr + 1 ;
+
+		sf_command (NULL, SFC_GET_LIB_VERSION, buffer, sizeof (buffer)) ;
+
+		printf ("%s (%s,%s)\n", argv [0], src_get_version (), buffer) ;
+		exit (0) ;
+		} ;
+
+	if (argc != 5 && argc != 7 && argc != 8)
+		usage_exit (argv [0]) ;
+
+	/* Set default converter. */
+	converter = DEFAULT_CONVERTER ;
+
+	for (k = 1 ; k < argc - 2 ; k++)
+	{	if (strcmp (argv [k], "--max-speed") == 0)
+			max_speed = SF_TRUE ;
+		else if (strcmp (argv [k], "--no-normalize") == 0)
+			normalize = 0 ;
+		else if (strcmp (argv [k], "-to") == 0)
+		{	k ++ ;
+			new_sample_rate = atoi (argv [k]) ;
+			}
+		else if (strcmp (argv [k], "-by") == 0)
+		{	k ++ ;
+			src_ratio = atof (argv [k]) ;
+			}
+		else if (strcmp (argv [k], "-c") == 0)
+		{	k ++ ;
+			converter = atoi (argv [k]) ;
+			}
+		else
+			usage_exit (argv [0]) ;
+		} ;
+
+	if (new_sample_rate <= 0 && src_ratio <= 0.0)
+		usage_exit (argv [0]) ;
+
+	if (src_get_name (converter) == NULL)
+	{	printf ("Error : bad converter number.\n") ;
+		usage_exit (argv [0]) ;
+		} ;
+
+	if (strcmp (argv [argc - 2], argv [argc - 1]) == 0)
+	{	printf ("Error : input and output file names are the same.\n") ;
+		exit (1) ;
+		} ;
+
+	if ((infile = sf_open (argv [argc - 2], SFM_READ, &sfinfo)) == NULL)
+	{	printf ("Error : Not able to open input file '%s'\n", argv [argc - 2]) ;
+		exit (1) ;
+		} ;
+
+	printf ("Input File    : %s\n", argv [argc - 2]) ;
+	printf ("Sample Rate   : %d\n", sfinfo.samplerate) ;
+	printf ("Input Frames  : %ld\n\n", (long) sfinfo.frames) ;
+
+	if (new_sample_rate > 0)
+	{	src_ratio = (1.0 * new_sample_rate) / sfinfo.samplerate ;
+		sfinfo.samplerate = new_sample_rate ;
+		}
+	else if (src_is_valid_ratio (src_ratio))
+		sfinfo.samplerate = (int) floor (sfinfo.samplerate * src_ratio) ;
+	else
+	{	printf ("Not able to determine new sample rate. Exiting.\n") ;
+		sf_close (infile) ;
+		exit (1) ;
+		} ;
+
+	if (fabs (src_ratio - 1.0) < 1e-20)
+	{	printf ("Target samplerate and input samplerate are the same. Exiting.\n") ;
+		sf_close (infile) ;
+		exit (0) ;
+		} ;
+
+	printf ("SRC Ratio     : %f\n", src_ratio) ;
+	printf ("Converter     : %s\n\n", src_get_name (converter)) ;
+
+	if (src_is_valid_ratio (src_ratio) == 0)
+	{	printf ("Error : Sample rate change out of valid range.\n") ;
+		sf_close (infile) ;
+		exit (1) ;
+		} ;
+
+	/* Delete the output file length to zero if already exists. */
+	remove (argv [argc - 1]) ;
+
+	printf ("Output file   : %s\n", argv [argc - 1]) ;
+	printf ("Sample Rate   : %d\n", sfinfo.samplerate) ;
+
+	do
+	{	sf_close (outfile) ;
+
+		if ((outfile = sf_open (argv [argc - 1], SFM_WRITE, &sfinfo)) == NULL)
+		{	printf ("Error : Not able to open output file '%s'\n", argv [argc - 1]) ;
+			sf_close (infile) ;
+			exit (1) ;
+			} ;
+
+		if (max_speed)
+		{	/* This is mainly for the comparison program tests/src-evaluate.c */
+			sf_command (outfile, SFC_SET_ADD_PEAK_CHUNK, NULL, SF_FALSE) ;
+			}
+		else
+		{	/* Update the file header after every write. */
+			sf_command (outfile, SFC_SET_UPDATE_HEADER_AUTO, NULL, SF_TRUE) ;
+			} ;
+
+		sf_command (outfile, SFC_SET_CLIPPING, NULL, SF_TRUE) ;
+
+		count = sample_rate_convert (infile, outfile, converter, src_ratio, sfinfo.channels, &gain, normalize) ;
+		}
+	while (count < 0) ;
+
+	printf ("Output Frames : %ld\n\n", (long) count) ;
+
+	sf_close (infile) ;
+	sf_close (outfile) ;
+
+	return 0 ;
+} /* main */
+
+/*==============================================================================
+*/
+
+static sf_count_t
+sample_rate_convert (SNDFILE *infile, SNDFILE *outfile, int converter, double src_ratio, int channels, double * gain, int normalize)
+{	static float input [BUFFER_LEN] ;
+	static float output [BUFFER_LEN] ;
+
+	SRC_STATE	*src_state ;
+	SRC_DATA	src_data ;
+	int			error ;
+	double		max = 0.0 ;
+	sf_count_t	output_count = 0 ;
+
+	sf_seek (infile, 0, SEEK_SET) ;
+	sf_seek (outfile, 0, SEEK_SET) ;
+
+	/* Initialize the sample rate converter. */
+	if ((src_state = src_new (converter, channels, &error)) == NULL)
+	{	printf ("\n\nError : src_new() failed : %s.\n\n", src_strerror (error)) ;
+		exit (1) ;
+		} ;
+
+	src_data.end_of_input = 0 ; /* Set this later. */
+
+	/* Start with zero to force load in while loop. */
+	src_data.input_frames = 0 ;
+	src_data.data_in = input ;
+
+	src_data.src_ratio = src_ratio ;
+
+	src_data.data_out = output ;
+	src_data.output_frames = BUFFER_LEN /channels ;
+
+	while (1)
+	{
+		/* If the input buffer is empty, refill it. */
+		if (src_data.input_frames == 0)
+		{	src_data.input_frames = sf_readf_float (infile, input, BUFFER_LEN / channels) ;
+			src_data.data_in = input ;
+
+			/* The last read will not be a full buffer, so snd_of_input. */
+			if (src_data.input_frames < BUFFER_LEN / channels)
+				src_data.end_of_input = SF_TRUE ;
+			} ;
+
+		if ((error = src_process (src_state, &src_data)))
+		{	printf ("\nError : %s\n", src_strerror (error)) ;
+			exit (1) ;
+			} ;
+
+		/* Terminate if done. */
+		if (src_data.end_of_input && src_data.output_frames_gen == 0)
+			break ;
+
+		max = apply_gain (src_data.data_out, src_data.output_frames_gen, channels, max, *gain) ;
+
+		/* Write output. */
+		sf_writef_float (outfile, output, src_data.output_frames_gen) ;
+		output_count += src_data.output_frames_gen ;
+
+		src_data.data_in += src_data.input_frames_used * channels ;
+		src_data.input_frames -= src_data.input_frames_used ;
+		} ;
+
+	src_delete (src_state) ;
+
+	if (normalize && max > 1.0)
+	{	*gain = 1.0 / max ;
+		printf ("\nOutput has clipped. Restarting conversion to prevent clipping.\n\n") ;
+		return -1 ;
+		} ;
+
+	return output_count ;
+} /* sample_rate_convert */
+
+static double
+apply_gain (float * data, long frames, int channels, double max, double gain)
+{
+	long k ;
+
+	for (k = 0 ; k < frames * channels ; k++)
+	{	data [k] *= gain ;
+
+		if (fabs (data [k]) > max)
+			max = fabs (data [k]) ;
+		} ;
+
+	return max ;
+} /* apply_gain */
+
+static void
+usage_exit (const char *progname)
+{	char lsf_ver [128] ;
+	const char	*cptr ;
+	int		k ;
+
+	if ((cptr = strrchr (progname, '/')) != NULL)
+		progname = cptr + 1 ;
+
+	if ((cptr = strrchr (progname, '\\')) != NULL)
+		progname = cptr + 1 ;
+
+
+	sf_command (NULL, SFC_GET_LIB_VERSION, lsf_ver, sizeof (lsf_ver)) ;
+
+	printf ("\n"
+		"  A Sample Rate Converter using libsndfile for file I/O and Secret \n"
+		"  Rabbit Code (aka libsamplerate) for performing the conversion.\n"
+		"  It works on any file format supported by libsndfile with any \n"
+		"  number of channels (limited only by host memory).\n"
+		"\n"
+		"       %s\n"
+		"       %s\n"
+		"\n"
+		"  Usage : \n"
+		"       %s -to <new sample rate> [-c <number>] <input file> <output file>\n"
+		"       %s -by <amount> [-c <number>] <input file> <output file>\n"
+		"\n", src_get_version (), lsf_ver, progname, progname) ;
+
+	puts (
+		"  The optional -c argument allows the converter type to be chosen from\n"
+		"  the following list :"
+		"\n"
+		) ;
+
+	for (k = 0 ; (cptr = src_get_name (k)) != NULL ; k++)
+		printf ("       %d : %s%s\n", k, cptr, k == DEFAULT_CONVERTER ? " (default)" : "") ;
+
+	puts ("\n"
+		"  The --no-normalize option disables clipping check and normalization.") ;
+
+	puts ("") ;
+
+	exit (1) ;
+} /* usage_exit */
+
+/*==============================================================================
+*/
+
+#else /* (HAVE_SNFILE == 0) */
+
+/* Alternative main function when libsndfile is not available. */
+
+int
+main (void)
+{	puts (
+		"\n"
+		"****************************************************************\n"
+		"  This example program was compiled without libsndfile \n"
+		"  (http://www.mega-nerd.com/libsndfile/).\n"
+		"  It is therefore completely broken and non-functional.\n"
+		"****************************************************************\n"
+		"\n"
+		) ;
+
+	return 0 ;
+} /* main */
+
+#endif
+