comparison src/libsamplerate-0.1.9/examples/timewarp-file.c @ 41:481f5f8c5634

Current libsamplerate source

+/*
+** Copyright (c) 2005-2016, 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 ARRAY_LEN(x)	((int) (sizeof (x) / sizeof ((x) [0])))
+
+#define DEFAULT_CONVERTER 	SRC_SINC_MEDIUM_QUALITY
+
+#define	BUFFER_LEN			1024
+#define	INPUT_STEP_SIZE		8
+
+typedef struct
+{	sf_count_t	index ;
+	double		ratio ;
+} TIMEWARP_FACTOR ;
+
+static void usage_exit (const char *progname) ;
+static sf_count_t timewarp_convert (SNDFILE *infile, SNDFILE *outfile, int converter, int channels) ;
+
+int
+main (int argc, char *argv [])
+{	SNDFILE	*infile, *outfile ;
+	SF_INFO sfinfo ;
+	sf_count_t	count ;
+
+	if (argc != 3)
+		usage_exit (argv [0]) ;
+
+	putchar ('\n') ;
+	printf ("Input File    : %s\n", argv [argc - 2]) ;
+	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) ;
+		} ;
+
+	if (INPUT_STEP_SIZE * sfinfo.channels > BUFFER_LEN)
+	{	printf ("\n\nError : INPUT_STEP_SIZE * sfinfo.channels > BUFFER_LEN\n\n") ;
+		exit (1) ;
+		} ;
+
+
+	/* Delete the output file length to zero if already exists. */
+	remove (argv [argc - 1]) ;
+
+	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) ;
+		} ;
+
+	sf_command (outfile, SFC_SET_CLIPPING, NULL, SF_TRUE) ;
+
+	printf ("Output file   : %s\n", argv [argc - 1]) ;
+	printf ("Converter     : %s\n", src_get_name (DEFAULT_CONVERTER)) ;
+
+	count = timewarp_convert (infile, outfile, DEFAULT_CONVERTER, sfinfo.channels) ;
+
+	printf ("Output Frames : %ld\n\n", (long) count) ;
+
+	sf_close (infile) ;
+	sf_close (outfile) ;
+
+	return 0 ;
+} /* main */
+
+/*==============================================================================
+*/
+
+static TIMEWARP_FACTOR warp [] =
+{	{	0		, 1.00000001 },
+	{	20000	, 1.01000000 },
+	{	20200	, 1.00000001 },
+	{	40000	, 1.20000000 },
+	{	40300	, 1.00000001 },
+	{	60000	, 1.10000000 },
+	{	60400	, 1.00000001 },
+	{	80000	, 1.50000000 },
+	{	81000	, 1.00000001 },
+} ;
+
+static sf_count_t
+timewarp_convert (SNDFILE *infile, SNDFILE *outfile, int converter, int channels)
+{	static float input [BUFFER_LEN] ;
+	static float output [BUFFER_LEN] ;
+
+	SRC_STATE	*src_state ;
+	SRC_DATA	src_data ;
+	int			error, warp_index = 0 ;
+	sf_count_t	input_count = 0, 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 ;
+
+	if (warp [0].index > 0)
+		src_data.src_ratio = 1.0 ;
+	else
+	{	src_data.src_ratio = warp [0].ratio ;
+		warp_index ++ ;
+		} ;
+
+	src_data.data_out = output ;
+	src_data.output_frames = BUFFER_LEN /channels ;
+
+	while (1)
+	{
+		if (warp_index < ARRAY_LEN (warp) - 1 && input_count >= warp [warp_index].index)
+		{	src_data.src_ratio = warp [warp_index].ratio ;
+			warp_index ++ ;
+			} ;
+
+		/* If the input buffer is empty, refill it. */
+		if (src_data.input_frames == 0)
+		{	src_data.input_frames = sf_readf_float (infile, input, INPUT_STEP_SIZE) ;
+			input_count += src_data.input_frames ;
+			src_data.data_in = input ;
+
+			/* The last read will not be a full buffer, so snd_of_input. */
+			if (src_data.input_frames < INPUT_STEP_SIZE)
+				src_data.end_of_input = SF_TRUE ;
+			} ;
+
+		/* Process current block. */
+		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 ;
+
+		/* 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) ;
+
+	return output_count ;
+} /* timewarp_convert */
+
+/*------------------------------------------------------------------------------
+*/
+
+static void
+usage_exit (const char *progname)
+{	const char	*cptr ;
+
+	if ((cptr = strrchr (progname, '/')) != NULL)
+		progname = cptr + 1 ;
+
+	if ((cptr = strrchr (progname, '\\')) != NULL)
+		progname = cptr + 1 ;
+
+	printf ("\n"
+		"  A program demonstrating the time warping capabilities of libsamplerate."
+		"  It uses libsndfile for file I/O and Secret Rabbit Code (aka libsamplerate)"
+		"  for performing the warping.\n"
+		"  It works on any file format supported by libsndfile with any \n"
+		"  number of channels (limited only by host memory).\n"
+		"\n"
+		"  The warping is dependant on a table hard code into the source code.\n"
+		"\n"
+		"  libsamplerate version : %s\n"
+		"\n"
+		"  Usage : \n"
+		"       %s <input file> <output file>\n"
+		"\n", src_get_version (), progname) ;
+
+	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
+