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#!/usr/bin/perl -w
use strict;
require Math::BigInt;
my $usage = "
$0 <format> <bps> <channels> <sample-rate> <#samples> <sample-type>
<format> is one of aiff,wave,rf64
<bps> is 8,16,24,32
<channels> is 1-8
<sample-rate> is any 32-bit value
<#samples> is 0-2^64-1
<sample-type> is one of zero,rand
";
die $usage unless @ARGV == 6;
my %formats = ( 'aiff'=>1, 'wave'=>1, 'rf64'=>1 );
my %sampletypes = ( 'zero'=>1, 'rand'=>1 );
my @channelmask = ( 0, 1, 3, 7, 0x33, 0x607, 0x60f, 0, 0 ); #@@@@@@ need proper masks for 7,8
my ($format, $bps, $channels, $samplerate, $samples, $sampletype) = @ARGV;
my $bigsamples = new Math::BigInt $samples;
die $usage unless defined $formats{$format};
die $usage unless $bps == 8 || $bps == 16 || $bps == 24 || $bps == 32;
die $usage unless $channels >= 1 && $channels <= 8;
die $usage unless $samplerate >= 0 && $samplerate <= 4294967295;
die $usage unless defined $sampletypes{$sampletype};
# convert bits-per-sample to bytes-per-sample
$bps /= 8;
my $datasize = $samples * $bps * $channels;
my $bigdatasize = $bigsamples * $bps * $channels;
my $padding = int($bigdatasize & 1? 1 : 0);
my $wavx = ($format eq 'wave' || $format eq 'rf64') && ($channels > 2);
# write header
if ($format eq 'aiff') {
die "sample data too big for format\n" if 46 + $datasize + $padding > 4294967295;
# header
print "FORM";
print pack('N', 46 + $datasize + $padding);
print "AIFF";
# COMM chunk
print "COMM";
print pack('N', 18); # chunk size = 18
print pack('n', $channels);
print pack('N', $samples);
print pack('n', $bps * 8);
print pack_sane_extended($samplerate);
# SSND header
print "SSND";
print pack('N', $datasize + 8); # chunk size
print pack('N', 0); # ssnd_offset_size
print pack('N', 0); # blocksize
}
elsif ($format eq 'wave' || $format eq 'rf64') {
die "sample data too big for format\n" if $format eq 'wave' && ($wavx?60:36) + $datasize + $padding > 4294967295;
# header
if ($format eq 'wave') {
print "RIFF";
print pack('V', ($wavx?60:36) + $datasize + $padding);
print "WAVE";
}
else {
print "RF64";
print pack('V', 0xffffffff);
print "WAVE";
# ds64 chunk
print "ds64";
print pack('V', 28); # chunk size
my $bigriffsize = $bigdatasize + ($wavx?60:36) + (8+28) + $padding;
print pack_64('V', $bigriffsize);
print pack_64('V', $bigdatasize);
print pack_64('V', $bigsamples);
print pack('V', 0); # table size
}
# fmt chunk
print "fmt ";
print pack('V', $wavx?40:16); # chunk size
print pack('v', $wavx?65534:1); # compression code
print pack('v', $channels);
print pack('V', $samplerate);
print pack('V', $samplerate * $channels * $bps);
print pack('v', $bps); # block align = channels*((bps+7)/8)
print pack('v', $bps * 8); # bits per sample = ((bps+7)/8)*8
if ($wavx) {
print pack('v', 22); # cbSize
print pack('v', $bps * 8); # validBitsPerSample
print pack('V', $channelmask[$channels]);
# GUID = {0x00000001, 0x0000, 0x0010, {0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}}
print "\x01\x00\x00\x00\x00\x00\x10\x00\x80\x00\x00\xaa\x00\x38\x9b\x71";
}
# data header
print "data";
print pack('V', $format eq 'wave'? $datasize : 0xffffffff);
}
else {
die;
}
# write sample data
if ($sampletype eq 'zero') {
my $chunk = 4096;
my $buf = pack("x[".($channels*$bps*$chunk)."]");
for (my $s = $samples; $s > 0; $s -= $chunk) {
if ($s < $chunk) {
print substr($buf, 0, $channels*$bps*$s);
}
else {
print $buf;
}
}
}
elsif ($sampletype eq 'rand') {
for (my $s = 0; $s < $samples; $s++) {
for (my $c = 0; $c < $channels; $c++) {
for (my $b = 0; $b < $bps; $b++) {
print pack('C', int(rand(256)));
}
}
}
}
else {
die;
}
print "\x00" if $padding;
exit 0;
sub pack_sane_extended
{
my $val = shift;
die unless $val > 0;
my $shift;
for ($shift = 0; ($val>>(31-$shift)) == 0; ++$shift) {
}
$val <<= $shift;
my $exponent = 63 - ($shift + 32);
return pack('nNN', $exponent + 16383, $val, 0);
}
sub pack_64
{
my $c = shift;
my $v1 = shift;
my $v2 = $v1->copy();
if ($c eq 'V') {
$v1->band(0xffffffff);
$v2->brsft(32);
}
elsif ($c eq 'C') {
$v2->band(0xffffffff);
$v1->brsft(32);
}
else {
die;
}
return pack("$c$c", 0+$v1->bstr(), 0+$v2->bstr());
}
|
