333 lines
9.0 KiB
C
333 lines
9.0 KiB
C
/*
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** Copyright (C) 2002-2011 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 DEFAULT_CONVERTER SRC_SINC_MEDIUM_QUALITY
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#define BUFFER_LEN 4096 /*-(1<<16)-*/
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static void usage_exit (const char *progname) ;
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static sf_count_t sample_rate_convert (SNDFILE *infile, SNDFILE *outfile, int converter, double src_ratio, int channels, double * gain) ;
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static double apply_gain (float * data, long frames, int channels, double max, double gain) ;
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int
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main (int argc, char *argv [])
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{ SNDFILE *infile, *outfile = NULL ;
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SF_INFO sfinfo ;
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sf_count_t count ;
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double src_ratio = -1.0, gain = 1.0 ;
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int new_sample_rate = -1, k, converter, max_speed = SF_FALSE ;
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if (argc == 2 && strcmp (argv [1], "--version") == 0)
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{ char buffer [64], *cptr ;
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if ((cptr = strrchr (argv [0], '/')) != NULL)
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argv [0] = cptr + 1 ;
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if ((cptr = strrchr (argv [0], '\\')) != NULL)
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argv [0] = cptr + 1 ;
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sf_command (NULL, SFC_GET_LIB_VERSION, buffer, sizeof (buffer)) ;
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printf ("%s (%s,%s)\n", argv [0], src_get_version (), buffer) ;
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exit (0) ;
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} ;
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if (argc != 5 && argc != 7 && argc != 8)
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usage_exit (argv [0]) ;
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/* Set default converter. */
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converter = DEFAULT_CONVERTER ;
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for (k = 1 ; k < argc - 2 ; k++)
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{ if (strcmp (argv [k], "--max-speed") == 0)
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max_speed = SF_TRUE ;
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else if (strcmp (argv [k], "-to") == 0)
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{ k ++ ;
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new_sample_rate = atoi (argv [k]) ;
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}
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else if (strcmp (argv [k], "-by") == 0)
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{ k ++ ;
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src_ratio = atof (argv [k]) ;
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}
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else if (strcmp (argv [k], "-c") == 0)
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{ k ++ ;
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converter = atoi (argv [k]) ;
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}
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else
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usage_exit (argv [0]) ;
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} ;
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if (new_sample_rate <= 0 && src_ratio <= 0.0)
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usage_exit (argv [0]) ;
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if (src_get_name (converter) == NULL)
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{ printf ("Error : bad converter number.\n") ;
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usage_exit (argv [0]) ;
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} ;
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if (strcmp (argv [argc - 2], argv [argc - 1]) == 0)
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{ printf ("Error : input and output file names are the same.\n") ;
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exit (1) ;
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} ;
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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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printf ("Input File : %s\n", argv [argc - 2]) ;
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printf ("Sample Rate : %d\n", sfinfo.samplerate) ;
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printf ("Input Frames : %ld\n\n", (long) sfinfo.frames) ;
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if (new_sample_rate > 0)
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{ src_ratio = (1.0 * new_sample_rate) / sfinfo.samplerate ;
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sfinfo.samplerate = new_sample_rate ;
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}
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else if (src_is_valid_ratio (src_ratio))
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sfinfo.samplerate = (int) floor (sfinfo.samplerate * src_ratio) ;
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else
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{ printf ("Not able to determine new sample rate. Exiting.\n") ;
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sf_close (infile) ;
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exit (1) ;
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} ;
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if (fabs (src_ratio - 1.0) < 1e-20)
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{ printf ("Target samplerate and input samplerate are the same. Exiting.\n") ;
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sf_close (infile) ;
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exit (0) ;
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} ;
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printf ("SRC Ratio : %f\n", src_ratio) ;
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printf ("Converter : %s\n\n", src_get_name (converter)) ;
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if (src_is_valid_ratio (src_ratio) == 0)
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{ printf ("Error : Sample rate change out of valid range.\n") ;
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sf_close (infile) ;
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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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printf ("Output file : %s\n", argv [argc - 1]) ;
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printf ("Sample Rate : %d\n", sfinfo.samplerate) ;
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do
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{ sf_close (outfile) ;
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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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if (max_speed)
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{ /* This is mainly for the comparison program tests/src-evaluate.c */
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sf_command (outfile, SFC_SET_ADD_PEAK_CHUNK, NULL, SF_FALSE) ;
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}
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else
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{ /* Update the file header after every write. */
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sf_command (outfile, SFC_SET_UPDATE_HEADER_AUTO, NULL, SF_TRUE) ;
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} ;
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sf_command (outfile, SFC_SET_CLIPPING, NULL, SF_TRUE) ;
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count = sample_rate_convert (infile, outfile, converter, src_ratio, sfinfo.channels, &gain) ;
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}
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while (count < 0) ;
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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 sf_count_t
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sample_rate_convert (SNDFILE *infile, SNDFILE *outfile, int converter, double src_ratio, int channels, double * gain)
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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 ;
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double max = 0.0 ;
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sf_count_t 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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src_data.src_ratio = src_ratio ;
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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 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, BUFFER_LEN / channels) ;
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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 < BUFFER_LEN / channels)
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src_data.end_of_input = SF_TRUE ;
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} ;
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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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max = apply_gain (src_data.data_out, src_data.output_frames_gen, channels, max, *gain) ;
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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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if (max > 1.0)
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{ *gain = 1.0 / max ;
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printf ("\nOutput has clipped. Restarting conversion to prevent clipping.\n\n") ;
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return -1 ;
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} ;
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return output_count ;
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} /* sample_rate_convert */
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static double
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apply_gain (float * data, long frames, int channels, double max, double gain)
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{
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long k ;
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for (k = 0 ; k < frames * channels ; k++)
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{ data [k] *= gain ;
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if (fabs (data [k]) > max)
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max = fabs (data [k]) ;
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} ;
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return max ;
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} /* apply_gain */
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static void
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usage_exit (const char *progname)
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{ char lsf_ver [128] ;
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const char *cptr ;
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int k ;
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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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sf_command (NULL, SFC_GET_LIB_VERSION, lsf_ver, sizeof (lsf_ver)) ;
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printf ("\n"
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" A Sample Rate Converter using libsndfile for file I/O and Secret \n"
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" Rabbit Code (aka libsamplerate) for performing the conversion.\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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" %s\n"
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" %s\n"
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"\n"
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" Usage : \n"
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" %s -to <new sample rate> [-c <number>] <input file> <output file>\n"
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" %s -by <amount> [-c <number>] <input file> <output file>\n"
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"\n", src_get_version (), lsf_ver, progname, progname) ;
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puts (
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" The optional -c argument allows the converter type to be chosen from\n"
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" the following list :"
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"\n"
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) ;
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for (k = 0 ; (cptr = src_get_name (k)) != NULL ; k++)
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printf (" %d : %s%s\n", k, cptr, k == DEFAULT_CONVERTER ? " (default)" : "") ;
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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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