--- /dev/null
+/*
+** 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