298 lines
9.3 KiB
Perl
298 lines
9.3 KiB
Perl
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#------------------------------------------------------------------------------
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# File: FLAC.pm
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#
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# Description: Read Free Lossless Audio Codec information
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#
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# Revisions: 11/13/2006 - P. Harvey Created
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#
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# References: 1) http://flac.sourceforge.net/
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#------------------------------------------------------------------------------
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package Image::ExifTool::FLAC;
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use strict;
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use vars qw($VERSION);
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use Image::ExifTool qw(:DataAccess :Utils);
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$VERSION = '1.07';
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sub ProcessBitStream($$$);
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# FLAC metadata blocks
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%Image::ExifTool::FLAC::Main = (
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NOTES => q{
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Free Lossless Audio Codec (FLAC) meta information. ExifTool also extracts
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ID3 information from these files.
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},
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0 => {
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Name => 'StreamInfo',
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SubDirectory => { TagTable => 'Image::ExifTool::FLAC::StreamInfo' },
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},
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1 => { Name => 'Padding', Binary => 1, Unknown => 1 },
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2 => { Name => 'Application', Binary => 1, Unknown => 1 },
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3 => { Name => 'SeekTable', Binary => 1, Unknown => 1 },
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4 => {
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Name => 'VorbisComment',
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SubDirectory => { TagTable => 'Image::ExifTool::Vorbis::Comments' },
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},
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5 => { Name => 'CueSheet', Binary => 1, Unknown => 1 },
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6 => {
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Name => 'Picture',
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SubDirectory => { TagTable => 'Image::ExifTool::FLAC::Picture' },
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},
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# 7-126 - Reserved
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# 127 - Invalid
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);
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%Image::ExifTool::FLAC::StreamInfo = (
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PROCESS_PROC => \&ProcessBitStream,
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NOTES => 'FLAC is big-endian, so bit 0 is the high-order bit in this table.',
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GROUPS => { 2 => 'Audio' },
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'Bit000-015' => 'BlockSizeMin',
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'Bit016-031' => 'BlockSizeMax',
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'Bit032-055' => 'FrameSizeMin',
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'Bit056-079' => 'FrameSizeMax',
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'Bit080-099' => 'SampleRate',
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'Bit100-102' => {
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Name => 'Channels',
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ValueConv => '$val + 1',
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},
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'Bit103-107' => {
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Name => 'BitsPerSample',
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ValueConv => '$val + 1',
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},
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'Bit108-143' => 'TotalSamples',
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);
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%Image::ExifTool::FLAC::Picture = (
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PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
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GROUPS => { 2 => 'Image' },
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FORMAT => 'int32u',
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0 => {
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Name => 'PictureType',
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PrintConv => { # (Note: Duplicated in ID3, ASF and FLAC modules!)
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0 => 'Other',
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1 => '32x32 PNG Icon',
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2 => 'Other Icon',
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3 => 'Front Cover',
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4 => 'Back Cover',
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5 => 'Leaflet',
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6 => 'Media',
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7 => 'Lead Artist',
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8 => 'Artist',
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9 => 'Conductor',
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10 => 'Band',
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11 => 'Composer',
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12 => 'Lyricist',
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13 => 'Recording Studio or Location',
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14 => 'Recording Session',
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15 => 'Performance',
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16 => 'Capture from Movie or Video',
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17 => 'Bright(ly) Colored Fish',
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18 => 'Illustration',
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19 => 'Band Logo',
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20 => 'Publisher Logo',
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},
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},
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1 => {
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Name => 'PictureMIMEType',
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Format => 'var_pstr32',
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},
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2 => {
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Name => 'PictureDescription',
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Format => 'var_pstr32',
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ValueConv => '$self->Decode($val, "UTF8")',
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},
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3 => 'PictureWidth',
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4 => 'PictureHeight',
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5 => 'PictureBitsPerPixel',
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6 => 'PictureIndexedColors',
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7 => 'PictureLength',
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8 => {
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Name => 'Picture',
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Groups => { 2 => 'Preview' },
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Format => 'undef[$val{7}]',
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Binary => 1,
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},
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);
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# FLAC composite tags
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%Image::ExifTool::FLAC::Composite = (
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Duration => {
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Require => {
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0 => 'FLAC:SampleRate',
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1 => 'FLAC:TotalSamples',
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},
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ValueConv => '($val[0] and $val[1]) ? $val[1] / $val[0] : undef',
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PrintConv => 'ConvertDuration($val)',
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},
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);
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# add our composite tags
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Image::ExifTool::AddCompositeTags('Image::ExifTool::FLAC');
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#------------------------------------------------------------------------------
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# Process information in a bit stream
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# Inputs: 0) ExifTool object ref, 1) dirInfo ref, 2) tag table ref
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# Notes: Byte order is used to determine the ordering of bits in the stream:
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# 'MM' = bit 0 is most significant, 'II' = bit 0 is least significant
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# - can handle arbitrarily wide values (eg. 8-byte or larger integers)
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sub ProcessBitStream($$$)
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{
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my ($et, $dirInfo, $tagTablePtr) = @_;
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my $dataPt = $$dirInfo{DataPt};
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my $dataPos = $$dirInfo{DataPos};
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my $dirStart = $$dirInfo{DirStart} || 0;
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my $dirLen = $$dirInfo{DirLen} || (length($$dataPt) - $dirStart);
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my $verbose = $et->Options('Verbose');
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my $byteOrder = GetByteOrder();
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my $tag;
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if ($verbose) {
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$et->VPrint(0, " + [BitStream directory, $dirLen bytes, '$byteOrder' order]\n");
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}
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foreach $tag (sort keys %$tagTablePtr) {
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next unless $tag =~ /^Bit(\d+)-?(\d+)?/;
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my ($b1, $b2) = ($1, $2 || $1); # start/end bit numbers in stream
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my ($i1, $i2) = (int($b1 / 8), int($b2 / 8)); # start/end byte numbers
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my ($f1, $f2) = ($b1 % 8, $b2 % 8); # start/end bit numbers within each byte
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last if $i2 >= $dirLen;
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my $val = 0;
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my ($i, $mask, $extra);
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$extra = ', Mask=0x' if $verbose and ($f1 != 0 or $f2 != 7);
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if ($byteOrder eq 'MM') {
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# loop from high byte to low byte
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for ($i=$i1; $i<=$i2; ++$i) {
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$mask = 0xff;
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if ($i == $i1 and $f1) {
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# mask off high bits in first word (0 is high bit)
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foreach ((8-$f1) .. 7) { $mask ^= (1 << $_) }
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}
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if ($i == $i2 and $f2 < 7) {
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# mask off low bits in last word (7 is low bit)
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foreach (0 .. (6-$f2)) { $mask ^= (1 << $_) }
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}
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$val = $val * 256 + ($mask & Get8u($dataPt, $i + $dirStart));
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$extra .= sprintf('%.2x', $mask) if $extra;
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}
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} else {
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# (FLAC is big-endian, but support little-endian bit streams
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# so this routine can be used by other modules)
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# loop from high byte to low byte
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for ($i=$i2; $i>=$i1; --$i) {
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$mask = 0xff;
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if ($i == $i1 and $f1) {
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# mask off low bits in first word (0 is low bit)
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foreach (0 .. ($f1-1)) { $mask ^= (1 << $_) }
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}
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if ($i == $i2 and $f2 < 7) {
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# mask off high bits in last word (7 is high bit)
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foreach (($f2+1) .. 7) { $mask ^= (1 << $_) }
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}
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$val = $val * 256 + ($mask & Get8u($dataPt, $i + $dirStart));
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$extra .= sprintf('%.2x', $mask) if $extra;
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}
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}
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# shift word down until low bit is in position 0
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until ($mask & 0x01) {
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$val /= 2;
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$mask >>= 1;
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}
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$et->HandleTag($tagTablePtr, $tag, $val,
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DataPt => $dataPt,
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DataPos => $dataPos,
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Start => $dirStart + $i1,
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Size => $i2 - $i1 + 1,
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Extra => $extra,
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);
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}
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return 1;
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}
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#------------------------------------------------------------------------------
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# Extract information from an Ogg FLAC file
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# Inputs: 0) ExifTool object reference, 1) dirInfo reference
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# Returns: 1 on success, 0 if this wasn't a valid Ogg FLAC file
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sub ProcessFLAC($$)
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{
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my ($et, $dirInfo) = @_;
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# must first check for leading/trailing ID3 information
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unless ($$et{DoneID3}) {
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require Image::ExifTool::ID3;
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Image::ExifTool::ID3::ProcessID3($et, $dirInfo) and return 1;
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}
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my $raf = $$dirInfo{RAF};
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my $verbose = $et->Options('Verbose');
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my $out = $et->Options('TextOut');
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my ($buff, $err);
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# check FLAC signature
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$raf->Read($buff, 4) == 4 and $buff eq 'fLaC' or return 0;
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$et->SetFileType();
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SetByteOrder('MM');
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my $tagTablePtr = GetTagTable('Image::ExifTool::FLAC::Main');
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for (;;) {
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# read next metadata block header
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$raf->Read($buff, 4) == 4 or last;
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my $flag = unpack('C', $buff);
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my $size = unpack('N', $buff) & 0x00ffffff;
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$raf->Read($buff, $size) == $size or $err = 1, last;
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my $last = $flag & 0x80; # last-metadata-block flag
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my $tag = $flag & 0x7f; # tag bits
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if ($verbose) {
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print $out "FLAC metadata block, type $tag:\n";
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$et->VerboseDump(\$buff, DataPos => $raf->Tell() - $size);
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}
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$et->HandleTag($tagTablePtr, $tag, undef,
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DataPt => \$buff,
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DataPos => $raf->Tell() - $size,
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);
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last if $last; # all done if is set
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}
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$err and $et->Warn('Format error in FLAC file');
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return 1;
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}
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1; # end
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__END__
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=head1 NAME
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Image::ExifTool::FLAC - Read Free Lossless Audio Codec information
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=head1 SYNOPSIS
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This module is used by Image::ExifTool
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=head1 DESCRIPTION
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This module contains definitions required by Image::ExifTool to extract meta
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information from Free Lossless Audio Codec (FLAC) audio files.
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=head1 AUTHOR
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Copyright 2003-2016, Phil Harvey (phil at owl.phy.queensu.ca)
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This library is free software; you can redistribute it and/or modify it
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under the same terms as Perl itself.
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=head1 REFERENCES
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=over 4
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=item L<http://flac.sourceforge.net/>
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=back
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=head1 SEE ALSO
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L<Image::ExifTool::TagNames/FLAC Tags>,
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L<Image::ExifTool::TagNames/Ogg Tags>,
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L<Image::ExifTool(3pm)|Image::ExifTool>
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=cut
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