298 lines
7.6 KiB
C
298 lines
7.6 KiB
C
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//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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//
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// Copyright (C) Microsoft Corporation, 1998 - 1999
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//
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// File: gen-wav.c
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//
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//--------------------------------------------------------------------------
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#include "stdio.h"
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#include "stdlib.h"
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#include "windows.h"
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// #include "ntddk.h"
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//
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// MAX is defined to prevent overflow errors
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// floor( (0xffffffff - 54)/(4*44100) )
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//
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#define MAX_SECONDS 24347
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#define SAMPLE_STEP 1
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VOID
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__cdecl
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WriteIncreasingSawTooth(
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FILE * OutFile,
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ULONG32 NumberOfSeconds
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)
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{
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ULONG32 i;
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ULONG32 currentSample = 0;
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ULONG32 samples = 44100 * NumberOfSeconds;
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for ( i = 0; i < samples; i++ ) {
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putc( (currentSample >> 0) & 0xff, OutFile );
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putc( (currentSample >> 8) & 0xff, OutFile );
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putc( (currentSample >> 0) & 0xff, OutFile );
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putc( (currentSample >> 8) & 0xff, OutFile );
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currentSample += SAMPLE_STEP;
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}
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}
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VOID
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__cdecl
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WriteDecreasingSawTooth(
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FILE * OutFile,
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ULONG32 NumberOfSeconds
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)
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{
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ULONG32 i;
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ULONG32 currentSample = 0;
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ULONG32 samples = 44100 * NumberOfSeconds;
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for ( i = 0; i < samples; i++ ) {
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putc( (currentSample >> 0) & 0xff, OutFile );
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putc( (currentSample >> 8) & 0xff, OutFile );
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putc( (currentSample >> 0) & 0xff, OutFile );
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putc( (currentSample >> 8) & 0xff, OutFile );
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currentSample -= SAMPLE_STEP;
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}
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}
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VOID
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__cdecl
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WriteTriangle(
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FILE * OutFile,
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ULONG32 NumberOfSeconds
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)
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{
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ULONG32 i;
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ULONG32 samples = 44100 * NumberOfSeconds;
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ULONG32 increasing = TRUE;
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LONG32 currentSample = 0;
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LONG32 highestSample = 0x00007fff - SAMPLE_STEP + 1;
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LONG32 lowestSample = 0xffff8000 + SAMPLE_STEP - 1;
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for ( i = 0; i < samples; i++ ) {
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putc( (currentSample >> 0) & 0xff, OutFile );
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putc( (currentSample >> 8) & 0xff, OutFile );
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putc( (currentSample >> 0) & 0xff, OutFile );
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putc( (currentSample >> 8) & 0xff, OutFile );
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if ( increasing == TRUE &&
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currentSample >= highestSample
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) {
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increasing = FALSE;
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}
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if ( increasing == FALSE &&
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currentSample <= lowestSample
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) {
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increasing = TRUE;
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}
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if ( increasing == TRUE ) {
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currentSample += SAMPLE_STEP;
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} else {
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currentSample -= SAMPLE_STEP;
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}
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}
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}
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VOID
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__cdecl
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WriteHeader(
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FILE * OutFile,
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ULONG32 NumberOfSeconds
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)
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{
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unsigned char header[] = {
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0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, // 0- 7
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0x57, 0x41, 0x56, 0x45, 0x66, 0x6D, 0x74, 0x20, // 8-15
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0x12, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02, 0x00, // 16-23
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0x44, 0xAC, 0x00, 0x00, 0x10, 0xB1, 0x02, 0x00, // 24-31
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0x04, 0x00, 0x10, 0x00, 0x00, 0x00, 0x66, 0x61, // 32-39
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0x63, 0x74, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, // 40-47
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0x00, 0x00, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, // 48-55
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0x00, 0x00 // 56-57 (length 58)
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};
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ULONG32 length;
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ULONG32 samples;
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ULONG32 other;
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ULONG32 i;
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//
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// setup the variable header info
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//
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// samples = 44100 * NumberOfSeconds
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// other = (samples * 4) + 8
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// length = other + 54
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samples = 44100 * NumberOfSeconds + 1; // one extra sample?
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other = ((44100 * NumberOfSeconds + 1) * 4) + 4;
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length = (((44100 * NumberOfSeconds + 1) * 4) + 4) + 50;
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//
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// Fill it in
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//
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header[4] = (length >> 0) & 0xff;
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header[5] = (length >> 8) & 0xff;
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header[6] = (length >> 16) & 0xff;
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header[7] = (length >> 24) & 0xff;
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header[46] = (samples >> 0) & 0xff;
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header[47] = (samples >> 8) & 0xff;
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header[48] = (samples >> 16) & 0xff;
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header[49] = (samples >> 24) & 0xff;
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header[54] = (other >> 0) & 0xff;
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header[55] = (other >> 8) & 0xff;
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header[56] = (other >> 16) & 0xff;
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header[57] = (other >> 24) & 0xff;
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for ( i = 0; i < sizeof(header); i++ ) {
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fprintf( OutFile, "%c", header[i] );
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}
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}
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/* 02b3c146
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The header to a WAV file is as follows:
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52 49 46 46 XX XX XX XX-57 41 56 45 66 6D 74 20
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12 00 00 00 01 00 02 00-44 AC 00 00 10 B1 02 00
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04 00 10 00 00 00 66 61-63 74 04 00 00 00 YY YY
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YY YY 64 61 74 61 ZZ ZZ-ZZ ZZ
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XX XX XX XX YY YY YY YY ZZ ZZ ZZ ZZ
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--------------------------------------------------------------
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1 = 46 b1 02 00 44 ac 00 00 14 b1 02 00 (0x2b110* +4)
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2 = 56 62 05 00 88 58 01 00 24 62 05 00 (0x2b110* +4)
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267 = 46 c1 b3 02 44 f0 ac 00 14 c1 b3 02 (0x2b110* +4)
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X = (length - 4) in reverse-byte order
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(eight is number of bytes including this part of the struct)
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Y = number of samples (0xac44 == 44100 == 1 second)
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Z = (# of seconds) * 0x02b1
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*/
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VOID
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__inline
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WriteFooter(
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FILE * OutFile
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)
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{
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printf( "writing the footer\n" );
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putc( 0x50, OutFile );
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putc( 0xB5, OutFile );
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putc( 0x50, OutFile );
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putc( 0xB5, OutFile );
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putc( 0x00, OutFile );
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putc( 0x00, OutFile );
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putc( 0x00, OutFile );
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putc( 0x00, OutFile );
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}
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VOID
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__cdecl
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main(
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int Argc,
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char ** Argv
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)
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{
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FILE * outFile;
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ULONG32 seconds;
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ULONG32 wavType = 1;
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CHAR fileName[256];
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if ( Argc > 1 ) {
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//
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// try to get number seconds they want audio
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//
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seconds = atoi( Argv[1] );
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if ( Argc > 2 ) {
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//
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// get the type of wavform
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//
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wavType = atoi( Argv[2] );
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}
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}
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if ( Argc < 2 ||
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Argc > 3 ||
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strcmp(Argv[1], "-?") == 0 ||
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strcmp(Argv[1], "-h") == 0 ||
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seconds > MAX_SECONDS ||
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wavType < 1 ||
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wavType > 3 ) {
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//
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// give usage help
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//
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printf( "\nUsage: %s seconds [wavtype]\n"
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"\tseconds must be a positive integer\n"
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"\tless than %d (prevents overflow)\n"
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"\twavtype can be one of three integers:\n"
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"\t\t1: increasing sawtooth (default)\n"
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"\t\t2: decreasing sawtooth\n"
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"\t\t3: triangular wav\n"
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"\n"
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, Argv[0]
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, MAX_SECONDS
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);
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exit(1);
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}
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switch( wavType ) {
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case 1:
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sprintf( fileName, "increase-%d.wav", seconds );
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printf( "Requesting %d seconds of increasing sawtooth wav output\n", seconds );
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outFile = fopen( fileName, "wb" );
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WriteHeader( outFile, seconds );
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WriteIncreasingSawTooth( outFile, seconds );
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WriteFooter( outFile );
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break;
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case 2:
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sprintf( fileName, "decrease-%d.wav", seconds );
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printf( "Requesting %d seconds of decreasing sawtooth wav output\n", seconds );
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outFile = fopen( fileName, "wb" );
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WriteHeader( outFile, seconds );
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WriteDecreasingSawTooth( outFile, seconds );
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WriteFooter( outFile );
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break;
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case 3:
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sprintf( fileName, "triangle-%d.wav", seconds );
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printf( "Requesting %d seconds of triangle wav output\n", seconds );
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outFile = fopen( fileName, "wb" );
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WriteHeader( outFile, seconds );
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WriteTriangle( outFile, seconds );
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WriteFooter( outFile );
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break;
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default:
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break;
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}
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exit(0);
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}
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