-/*
-** Copyright (C) 2001-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
-**
-** All rights reserved.
-**
-** Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are
-** met:
-**
-** * Redistributions of source code must retain the above copyright
-** notice, this list of conditions and the following disclaimer.
-** * Redistributions in binary form must reproduce the above copyright
-** notice, this list of conditions and the following disclaimer in
-** the documentation and/or other materials provided with the
-** distribution.
-** * Neither the author nor the names of any contributors may be used
-** to endorse or promote products derived from this software without
-** specific prior written permission.
-**
-** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-** TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-** PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
-** CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-** EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-** PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
-** OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
-** OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
-** ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
-
-#include <stdio.h>
-
-/* Include this header file to use functions from libsndfile. */
-#include <sndfile.h>
-
-/* This will be the length of the buffer used to hold.frames while
-** we process them.
-*/
-#define BUFFER_LEN 1024
-
-/* libsndfile can handle more than 6 channels but we'll restrict it to 6. */
-#define MAX_CHANNELS 6
-
-/* Function prototype. */
-static void process_data (double *data, int count, int channels) ;
-
-
-int
-main (void)
-{ /* This is a buffer of double precision floating point values
- ** which will hold our data while we process it.
- */
- static double data [BUFFER_LEN] ;
-
- /* A SNDFILE is very much like a FILE in the Standard C library. The
- ** sf_open function return an SNDFILE* pointer when they sucessfully
- ** open the specified file.
- */
- SNDFILE *infile, *outfile ;
-
- /* A pointer to an SF_INFO stutct is passed to sf_open.
- ** On read, the library fills this struct with information about the file.
- ** On write, the struct must be filled in before calling sf_open.
- */
- SF_INFO sfinfo ;
- int readcount ;
- const char *infilename = "input.wav" ;
- const char *outfilename = "output.wav" ;
-
- /* Here's where we open the input file. We pass sf_open the file name and
- ** a pointer to an SF_INFO struct.
- ** On successful open, sf_open returns a SNDFILE* pointer which is used
- ** for all subsequent operations on that file.
- ** If an error occurs during sf_open, the function returns a NULL pointer.
- **
- ** If you are trying to open a raw headerless file you will need to set the
- ** format and channels fields of sfinfo before calling sf_open(). For
- ** instance to open a raw 16 bit stereo PCM file you would need the following
- ** two lines:
- **
- ** sfinfo.format = SF_FORMAT_RAW | SF_FORMAT_PCM_16 ;
- ** sfinfo.channels = 2 ;
- */
- if (! (infile = sf_open (infilename, SFM_READ, &sfinfo)))
- { /* Open failed so print an error message. */
- printf ("Not able to open input file %s.\n", infilename) ;
- /* Print the error message from libsndfile. */
- puts (sf_strerror (NULL)) ;
- return 1 ;
- } ;
-
- if (sfinfo.channels > MAX_CHANNELS)
- { printf ("Not able to process more than %d channels\n", MAX_CHANNELS) ;
- return 1 ;
- } ;
- /* Open the output file. */
- if (! (outfile = sf_open (outfilename, SFM_WRITE, &sfinfo)))
- { printf ("Not able to open output file %s.\n", outfilename) ;
- puts (sf_strerror (NULL)) ;
- return 1 ;
- } ;
-
- /* While there are.frames in the input file, read them, process
- ** them and write them to the output file.
- */
- while ((readcount = sf_read_double (infile, data, BUFFER_LEN)))
- { process_data (data, readcount, sfinfo.channels) ;
- sf_write_double (outfile, data, readcount) ;
- } ;
-
- /* Close input and output files. */
- sf_close (infile) ;
- sf_close (outfile) ;
-
- return 0 ;
-} /* main */
-
-static void
-process_data (double *data, int count, int channels)
-{ double channel_gain [MAX_CHANNELS] = { 0.5, 0.8, 0.1, 0.4, 0.4, 0.9 } ;
- int k, chan ;
-
- /* Process the data here.
- ** If the soundfile contains more then 1 channel you need to take care of
- ** the data interleaving youself.
- ** Current we just apply a channel dependant gain.
- */
-
- for (chan = 0 ; chan < channels ; chan ++)
- for (k = chan ; k < count ; k+= channels)
- data [k] *= channel_gain [chan] ;
-
- return ;
-} /* process_data */
-
projects / Faustine.git / blobdiff