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////////////////////////////////////////////////////////////////////////////////

//

// Filename:    buildsamples.cpp

//

// Project:     CMod S6 System on a Chip, ZipCPU demonstration project

//

// Purpose:     This program converts an 8kHz, 16t, mono- sound data file into

//              samples that can be read and understood by the C compiler and

//      hence included in a S6SoC project as the ``doorbell'' audio sound.

//

//      To use this, first convert your sound file to 8kHz, 16t, raw mono

//      format.  The sox utility works well for this purpose.

//

//      Then, run this program wih the single argument being the name of that

//      sound file.   The standard output will be the resulting C-code 

//      representing/recreating that sound file.  Pipe this into a file for

//      inclusion in your program.  You can then reference both the number of

//      samples from that file, as well as the number of words those samples

//      are stored in, as well as what those samples are.

//

//      The samples themselves can then be placed in a flash partition, and

//      read like any memory from within your program.

//

// Creator:     Dan Gisselquist, Ph.D.

//              Gisselquist Technology, LLC

//

////////////////////////////////////////////////////////////////////////////////

//

// Copyright (C) 2015-2016, Gisselquist Technology, LLC

//

// This program is free software (firmware): 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 3 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 MERCHANTIBILITY 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.  (It's in the $(ROOT)/doc directory, run make with no

// target there if the PDF file isn't present.)  If not, see

// <http://www.gnu.org/licenses/> for a copy.

//

// License:     GPL, v3, as defined and found on www.gnu.org,

//              http://www.gnu.org/licenses/gpl.html

//

//

////////////////////////////////////////////////////////////////////////////////

//

//

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#define SLEN    512

#define ILEN    (SLEN/2)

int     main(int argc, char **argv) {

        FILE    *fp, *legal;

        char    cbuf[SLEN];

        short   sbuf[SLEN];

        int     nread = 0, nr;

        if (argc != 1) {

                fprintf(stderr,

"Usage:\tbuildsamples samplefile\n"

"\n"

"\twhere 'samplefile' is a sound data file consisting of 16-bit samples\n"

"\tthat have been sampled at 8kHz.  The sample file should have no\n"

"\theader, and should only reference a mono (not stereo) output.\n"

"\n"

"\tThe result is a C program fragment that can be redirected to a file for\n"

"\tlater inclusion in your project.\n");

                exit(EXIT_SUCCESS);

        }

        fp = fopen(argv[1], "rb");

        if (!fp) {

                fprintf(stderr, "Could not open %s for reading\n", argv[1]);

                exit(EXIT_FAILURE);

        }

        /*

        legal = fopen("../legal.txt", "r");

        if (!legal)

                legal = fopen("../../legal.txt", "r");

        */

        legal = NULL;

        if (legal) {

                while(fgets(cbuf, SLEN, legal)) {

                        if (strncmp(cbuf, "// Filename:", 12)==0)

                                printf("// Filename:\tsamples.c\n");

                        else    printf("%s", cbuf);

                } fclose(legal);

        } else {

                printf("// This file should be copyrighted but I can't find\n");

                printf("// the copyright statement.\n//\n");

        }

        printf(

"// This file is computer generated--DO NOT EDIT IT!  The generator file can\n"

"// be found in trunk/sw/host/%s\n"

"//\n"

"//\n"

"#ifndef\tSOUND_DATA_H\n"

"#define\tSOUND_DATA_H\n\n"

"const\tint\tsound_data[] = {\n", __FILE__);

        while((nr = fread(sbuf, sizeof(short), SLEN, fp))>0) {

                int     pos = 0;

                nread += nr;

                while(pos < nr) {

                        printf("\t");

                        for(int i=0; (pos<((nr+1)&-2))&&(i<8); i+=2) {

                                int iv = (sbuf[pos]<<16)|(sbuf[pos+1] & 0x0ffff);

                                printf("0x%08x, ", iv);

                                pos+=2;

                        } printf("\n");

                }

        } printf("\t0\n};\n");

        printf("\n\n"

"#define\tNSAMPLES\t%d\n"

"#define\tNSAMPLE_WORDS\t%d\n"

"\n\n#endif\n", nread, 1+((nread+1)>>1));

}