ref: 06a021bb7ab5a85975a6e27b7cc5255768df3666
dir: libsamplerate/examples/timewarp-file.c
/*
** Copyright (c) 2005-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
** All rights reserved.
**
** This code is released under 2-clause BSD license. Please see the
** file at : https://github.com/libsndfile/libsamplerate/blob/master/COPYING
*/
#include "src_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 = (long) 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"
" (https://github.com/libsndfile/libsndfile/).\n"
" It is therefore completely broken and non-functional.\n"
"****************************************************************\n"
"\n"
) ;
return 0 ;
} /* main */
#endif