Creates a WAVE file which contains just silence. Woo.

config.inc

;; -*- asm -*-
;;
;; Some ugly cruft:

%ifndef HZ
        %define HZ DEFAULT_HZ
        %warning No -DHZ=
%endif

%ifndef CHANNELS
        %define CHANNELS DEFAULT_CHANNELS
        %warning No -DCHANNELS=
%endif

%ifndef BITSPERSAMPLE
        %define BITSPERSAMPLE DEFAULT_BITSPERSAMPLE
        %warning No -DBITSPERSAMPLE=
%endif

%if BITSPERSAMPLE == 8 || BITSPERSAMPLE == 16
        %define BYTESPERSAMPLE BITSPERSAMPLE / 8
%else
        %error FIXME: Strange -DBITSPERSAMPLE=, is BITSPERSAMPLE (use 8 or 16)
        %define BYTESPERSAMPLE 0
%endif

%ifndef DURATION
        %define DURATION DEFAULT_DURATION
        %warning No -DDURATION=
%endif

%if DURATION < 500
        %define UNIT seconds
%else
        %define UNIT milliseconds
%endif

%warning Settings: HZ Hz, CHANNELS Channel(s), BITSPERSAMPLE Bits/Sample, DURATION UNIT

%undef UNIT

%if DURATION < 500
        %define NUMERATOR_DURATION DURATION
        %define DENOMINATOR_DURATION 1
%else
        %define NUMERATOR_DURATION DURATION
        %define DENOMINATOR_DURATION 1000
%endif

%if CHANNELS > 2
        %fatal FIXME: #Channels: CHANNELS > 2, needs some mapping
%endif

Gensilence.asm

;; Creates a WAVE file which contains just silence. Woo.
;;
;; Command line:
;;
;; nasm -f bin -o SILENCE.wav Gensilence.asm

%define DEFAULT_HZ 48000
%define DEFAULT_CHANNELS 2
%define DEFAULT_BITSPERSAMPLE 16
%define DEFAULT_DURATION 5      ;seconds

%include "config.inc"

%macro crlf 0
        db      13, 10
%endmacro

        ;; WRITE THE RIFF HEADER:
riff_header:
        db      'RIFF'
        dd      _end - _start

_start:
        db      'WAVE'

        ;; WRITE THE FORMAT CHUNK:
fmt_chunk:
        db      'fmt '
        dd      .end - .start

.start:
        dw      1                          ;wFormatTag, 1=PCM
        dw      CHANNELS                   ;wChannels
        dd      HZ                         ;dwSamplesPerSec
        dd      HZ*CHANNELS*BYTESPERSAMPLE ;dwAvgBytesPerSec
        dw      CHANNELS*BYTESPERSAMPLE    ;wBlockAlign, i.e. the frame size
        dw      BITSPERSAMPLE              ;wBitsPerSample

.end:

        ;; WRITE SOME JOKE JUNK CHUNK:
dave_chunk:
        db      'DAVE'
        dd      .end - .start

.start:
        crlf
        crlf
        db      'In deinem Haus cruist ein Creeper herum, '
        db      'ich glaub er sucht dich :)'
        crlf
        db      '-- brought to you by Dirty Dave/thewestwind'
        crlf
        crlf
        align   2, db 0
.end:

        ;; WRITE THE ACTUAL SAMPLES:
data_chunk:
        db      'data'
        dd      .end - .start

.start:
        times NUMERATOR_DURATION * (HZ * CHANNELS * BYTESPERSAMPLE) / DENOMINATOR_DURATION db 0
.end:

_end: