ref: 5930804fbd7c405e45a721b5bf5965d468b690d5
parent: c53804ea49e082966ae9619d05824098d779ebcb
author: Erik de Castro Lopo <erikd@coltrane>
date: Sat Nov 19 04:05:05 EST 2005
Add new file examples/timewarp-file.c.
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2005-11-19 Erik de Castro Lopo <erikd AT mega-nerd DOT com>
+
+ * examples/timewarp-file.c
+ New file.
+
2005-09-06 Erik de Castro Lopo <erikd AT mega-nerd DOT com>
* src/float_cast.h
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -3,7 +3,7 @@
bin_PROGRAMS = sndfile-resample
-noinst_PROGRAMS = varispeed-play
+noinst_PROGRAMS = varispeed-play timewarp-file
SAMPLERATEDIR =../src
INCLUDES = -I$(srcdir)/$(SAMPLERATEDIR) @OS_SPECIFIC_INCLUDES@
@@ -20,6 +20,9 @@
varispeed_play_SOURCES = varispeed-play.c audio_out.c audio_out.h
varispeed_play_LDADD = $(SAMPLERATEDIR)/libsamplerate.la $(SNDFILE_LIBS) $(OS_SPECIFIC_LINKS)
+
+timewarp_file_SOURCES = timewarp-file.c
+timewarp_file_LDADD = $(SAMPLERATEDIR)/libsamplerate.la $(SNDFILE_LIBS)
--- /dev/null
+++ b/examples/timewarp-file.c
@@ -1,0 +1,253 @@
+/*
+** Copyright (C) 2002-2004 Erik de Castro Lopo <erikd@mega-nerd.com>
+**
+** This program is free software; you can redistribute it and/or modify
+** it under the terms of the GNU General Public License as published by
+** the Free Software Foundation; either version 2 of the License, or
+** (at your option) any later version.
+**
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+** GNU General Public License for more details.
+**
+** You should have received a copy of the GNU General Public License
+** along with this program; if not, write to the Free Software
+** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+*/
+
+#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]) ;
+
+ 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\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 },+ { 1000, 1.00010000 },+ { 1062, 1.00000001 },+ { 2000, 1.01000000 },+ { 2071, 1.00000001 },+ { 3000, 1.20000000 },+ { 3081, 1.00000001 },+ { 4000, 1.50000000 },+ { 4091, 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 ;
+
+ 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 && input_count > warp [warp_index + 1].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 < BUFFER_LEN / channels)
+ 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_state = src_delete (src_state) ;
+
+ return output_count ;
+} /* timewarp_convert */
+
+/*------------------------------------------------------------------------------
+*/
+
+static void
+usage_exit (const char *progname)
+{ const char *cptr ;+ int k ;
+
+ if ((cptr = strrchr (progname, '/')) != NULL)
+ progname = cptr + 1 ;
+
+ if ((cptr = strrchr (progname, '\\')) != NULL)
+ progname = cptr + 1 ;
+
+ 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"
+ " libsamplerate version : %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 (), 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 ("") ;+
+ 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
+
+/*
+** Do not edit or modify anything in this comment block.
+** The arch-tag line is a file identity tag for the GNU Arch
+** revision control system.
+**
+** arch-tag: 0c461ce0-44a6-4f5e-9187-b5ce24cd46e0
+*/