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https://github.com/QB64Official/qb64.git
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240 lines
6.4 KiB
C
240 lines
6.4 KiB
C
/*
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** Copyright (C) 2005-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <math.h>
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#if (HAVE_SNDFILE)
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#include <samplerate.h>
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#include <sndfile.h>
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#define ARRAY_LEN(x) ((int) (sizeof (x) / sizeof ((x) [0])))
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#define DEFAULT_CONVERTER SRC_SINC_MEDIUM_QUALITY
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#define BUFFER_LEN 1024
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#define INPUT_STEP_SIZE 8
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typedef struct
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{ sf_count_t index ;
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double ratio ;
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} TIMEWARP_FACTOR ;
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static void usage_exit (const char *progname) ;
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static sf_count_t timewarp_convert (SNDFILE *infile, SNDFILE *outfile, int converter, int channels) ;
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int
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main (int argc, char *argv [])
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{ SNDFILE *infile, *outfile ;
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SF_INFO sfinfo ;
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sf_count_t count ;
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if (argc != 3)
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usage_exit (argv [0]) ;
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putchar ('\n') ;
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printf ("Input File : %s\n", argv [argc - 2]) ;
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if ((infile = sf_open (argv [argc - 2], SFM_READ, &sfinfo)) == NULL)
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{ printf ("Error : Not able to open input file '%s'\n", argv [argc - 2]) ;
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exit (1) ;
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} ;
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if (INPUT_STEP_SIZE * sfinfo.channels > BUFFER_LEN)
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{ printf ("\n\nError : INPUT_STEP_SIZE * sfinfo.channels > BUFFER_LEN\n\n") ;
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exit (1) ;
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} ;
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/* Delete the output file length to zero if already exists. */
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remove (argv [argc - 1]) ;
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if ((outfile = sf_open (argv [argc - 1], SFM_WRITE, &sfinfo)) == NULL)
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{ printf ("Error : Not able to open output file '%s'\n", argv [argc - 1]) ;
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sf_close (infile) ;
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exit (1) ;
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} ;
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sf_command (outfile, SFC_SET_CLIPPING, NULL, SF_TRUE) ;
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printf ("Output file : %s\n", argv [argc - 1]) ;
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printf ("Converter : %s\n", src_get_name (DEFAULT_CONVERTER)) ;
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count = timewarp_convert (infile, outfile, DEFAULT_CONVERTER, sfinfo.channels) ;
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printf ("Output Frames : %ld\n\n", (long) count) ;
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sf_close (infile) ;
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sf_close (outfile) ;
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return 0 ;
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} /* main */
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/*==============================================================================
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*/
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static TIMEWARP_FACTOR warp [] =
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{ { 0 , 1.00000001 },
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{ 20000 , 1.01000000 },
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{ 20200 , 1.00000001 },
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{ 40000 , 1.20000000 },
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{ 40300 , 1.00000001 },
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{ 60000 , 1.10000000 },
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{ 60400 , 1.00000001 },
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{ 80000 , 1.50000000 },
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{ 81000 , 1.00000001 },
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} ;
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static sf_count_t
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timewarp_convert (SNDFILE *infile, SNDFILE *outfile, int converter, int channels)
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{ static float input [BUFFER_LEN] ;
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static float output [BUFFER_LEN] ;
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SRC_STATE *src_state ;
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SRC_DATA src_data ;
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int error, warp_index = 0 ;
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sf_count_t input_count = 0, output_count = 0 ;
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sf_seek (infile, 0, SEEK_SET) ;
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sf_seek (outfile, 0, SEEK_SET) ;
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/* Initialize the sample rate converter. */
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if ((src_state = src_new (converter, channels, &error)) == NULL)
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{ printf ("\n\nError : src_new() failed : %s.\n\n", src_strerror (error)) ;
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exit (1) ;
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} ;
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src_data.end_of_input = 0 ; /* Set this later. */
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/* Start with zero to force load in while loop. */
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src_data.input_frames = 0 ;
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src_data.data_in = input ;
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if (warp [0].index > 0)
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src_data.src_ratio = 1.0 ;
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else
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{ src_data.src_ratio = warp [0].ratio ;
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warp_index ++ ;
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} ;
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src_data.data_out = output ;
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src_data.output_frames = BUFFER_LEN /channels ;
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while (1)
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{
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if (warp_index < ARRAY_LEN (warp) - 1 && input_count >= warp [warp_index].index)
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{ src_data.src_ratio = warp [warp_index].ratio ;
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warp_index ++ ;
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} ;
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/* If the input buffer is empty, refill it. */
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if (src_data.input_frames == 0)
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{ src_data.input_frames = sf_readf_float (infile, input, INPUT_STEP_SIZE) ;
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input_count += src_data.input_frames ;
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src_data.data_in = input ;
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/* The last read will not be a full buffer, so snd_of_input. */
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if (src_data.input_frames < INPUT_STEP_SIZE)
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src_data.end_of_input = SF_TRUE ;
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} ;
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/* Process current block. */
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if ((error = src_process (src_state, &src_data)))
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{ printf ("\nError : %s\n", src_strerror (error)) ;
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exit (1) ;
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} ;
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/* Terminate if done. */
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if (src_data.end_of_input && src_data.output_frames_gen == 0)
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break ;
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/* Write output. */
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sf_writef_float (outfile, output, src_data.output_frames_gen) ;
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output_count += src_data.output_frames_gen ;
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src_data.data_in += src_data.input_frames_used * channels ;
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src_data.input_frames -= src_data.input_frames_used ;
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} ;
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src_state = src_delete (src_state) ;
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return output_count ;
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} /* timewarp_convert */
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/*------------------------------------------------------------------------------
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*/
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static void
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usage_exit (const char *progname)
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{ const char *cptr ;
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if ((cptr = strrchr (progname, '/')) != NULL)
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progname = cptr + 1 ;
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if ((cptr = strrchr (progname, '\\')) != NULL)
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progname = cptr + 1 ;
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printf ("\n"
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" A program demonstrating the time warping capabilities of libsamplerate."
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" It uses libsndfile for file I/O and Secret Rabbit Code (aka libsamplerate)"
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" for performing the warping.\n"
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" It works on any file format supported by libsndfile with any \n"
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" number of channels (limited only by host memory).\n"
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"\n"
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" The warping is dependant on a table hard code into the source code.\n"
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"\n"
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" libsamplerate version : %s\n"
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"\n"
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" Usage : \n"
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" %s <input file> <output file>\n"
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"\n", src_get_version (), progname) ;
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puts ("") ;
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exit (1) ;
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} /* usage_exit */
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/*==============================================================================
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*/
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#else /* (HAVE_SNFILE == 0) */
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/* Alternative main function when libsndfile is not available. */
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int
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main (void)
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{ puts (
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"\n"
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"****************************************************************\n"
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" This example program was compiled without libsndfile \n"
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" (http://www.mega-nerd.com/libsndfile/).\n"
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" It is therefore completely broken and non-functional.\n"
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"****************************************************************\n"
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"\n"
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) ;
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return 0 ;
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} /* main */
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#endif
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