mirror of
https://github.com/Poniverse/Pony.fm.git
synced 2024-11-27 07:17:59 +01:00
205 lines
8.1 KiB
PHP
Executable file
205 lines
8.1 KiB
PHP
Executable file
<?php
|
|
/////////////////////////////////////////////////////////////////
|
|
/// getID3() by James Heinrich <info@getid3.org> //
|
|
// available at http://getid3.sourceforge.net //
|
|
// or http://www.getid3.org //
|
|
// also https://github.com/JamesHeinrich/getID3 //
|
|
/////////////////////////////////////////////////////////////////
|
|
// See readme.txt for more details //
|
|
/////////////////////////////////////////////////////////////////
|
|
// //
|
|
// module.audio.voc.php //
|
|
// module for analyzing Creative VOC Audio files //
|
|
// dependencies: NONE //
|
|
// ///
|
|
/////////////////////////////////////////////////////////////////
|
|
|
|
|
|
class getid3_voc extends getid3_handler
|
|
{
|
|
|
|
public function Analyze() {
|
|
$info = &$this->getid3->info;
|
|
|
|
$OriginalAVdataOffset = $info['avdataoffset'];
|
|
$this->fseek($info['avdataoffset']);
|
|
$VOCheader = $this->fread(26);
|
|
|
|
$magic = 'Creative Voice File';
|
|
if (substr($VOCheader, 0, 19) != $magic) {
|
|
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($VOCheader, 0, 19)).'"';
|
|
return false;
|
|
}
|
|
|
|
// shortcuts
|
|
$thisfile_audio = &$info['audio'];
|
|
$info['voc'] = array();
|
|
$thisfile_voc = &$info['voc'];
|
|
|
|
$info['fileformat'] = 'voc';
|
|
$thisfile_audio['dataformat'] = 'voc';
|
|
$thisfile_audio['bitrate_mode'] = 'cbr';
|
|
$thisfile_audio['lossless'] = true;
|
|
$thisfile_audio['channels'] = 1; // might be overriden below
|
|
$thisfile_audio['bits_per_sample'] = 8; // might be overriden below
|
|
|
|
// byte # Description
|
|
// ------ ------------------------------------------
|
|
// 00-12 'Creative Voice File'
|
|
// 13 1A (eof to abort printing of file)
|
|
// 14-15 Offset of first datablock in .voc file (std 1A 00 in Intel Notation)
|
|
// 16-17 Version number (minor,major) (VOC-HDR puts 0A 01)
|
|
// 18-19 2's Comp of Ver. # + 1234h (VOC-HDR puts 29 11)
|
|
|
|
$thisfile_voc['header']['datablock_offset'] = getid3_lib::LittleEndian2Int(substr($VOCheader, 20, 2));
|
|
$thisfile_voc['header']['minor_version'] = getid3_lib::LittleEndian2Int(substr($VOCheader, 22, 1));
|
|
$thisfile_voc['header']['major_version'] = getid3_lib::LittleEndian2Int(substr($VOCheader, 23, 1));
|
|
|
|
do {
|
|
|
|
$BlockOffset = $this->ftell();
|
|
$BlockData = $this->fread(4);
|
|
$BlockType = ord($BlockData{0});
|
|
$BlockSize = getid3_lib::LittleEndian2Int(substr($BlockData, 1, 3));
|
|
$ThisBlock = array();
|
|
|
|
getid3_lib::safe_inc($thisfile_voc['blocktypes'][$BlockType], 1);
|
|
switch ($BlockType) {
|
|
case 0: // Terminator
|
|
// do nothing, we'll break out of the loop down below
|
|
break;
|
|
|
|
case 1: // Sound data
|
|
$BlockData .= $this->fread(2);
|
|
if ($info['avdataoffset'] <= $OriginalAVdataOffset) {
|
|
$info['avdataoffset'] = $this->ftell();
|
|
}
|
|
$this->fseek($BlockSize - 2, SEEK_CUR);
|
|
|
|
$ThisBlock['sample_rate_id'] = getid3_lib::LittleEndian2Int(substr($BlockData, 4, 1));
|
|
$ThisBlock['compression_type'] = getid3_lib::LittleEndian2Int(substr($BlockData, 5, 1));
|
|
|
|
$ThisBlock['compression_name'] = $this->VOCcompressionTypeLookup($ThisBlock['compression_type']);
|
|
if ($ThisBlock['compression_type'] <= 3) {
|
|
$thisfile_voc['compressed_bits_per_sample'] = getid3_lib::CastAsInt(str_replace('-bit', '', $ThisBlock['compression_name']));
|
|
}
|
|
|
|
// Less accurate sample_rate calculation than the Extended block (#8) data (but better than nothing if Extended Block is not available)
|
|
if (empty($thisfile_audio['sample_rate'])) {
|
|
// SR byte = 256 - (1000000 / sample_rate)
|
|
$thisfile_audio['sample_rate'] = getid3_lib::trunc((1000000 / (256 - $ThisBlock['sample_rate_id'])) / $thisfile_audio['channels']);
|
|
}
|
|
break;
|
|
|
|
case 2: // Sound continue
|
|
case 3: // Silence
|
|
case 4: // Marker
|
|
case 6: // Repeat
|
|
case 7: // End repeat
|
|
// nothing useful, just skip
|
|
$this->fseek($BlockSize, SEEK_CUR);
|
|
break;
|
|
|
|
case 8: // Extended
|
|
$BlockData .= $this->fread(4);
|
|
|
|
//00-01 Time Constant:
|
|
// Mono: 65536 - (256000000 / sample_rate)
|
|
// Stereo: 65536 - (256000000 / (sample_rate * 2))
|
|
$ThisBlock['time_constant'] = getid3_lib::LittleEndian2Int(substr($BlockData, 4, 2));
|
|
$ThisBlock['pack_method'] = getid3_lib::LittleEndian2Int(substr($BlockData, 6, 1));
|
|
$ThisBlock['stereo'] = (bool) getid3_lib::LittleEndian2Int(substr($BlockData, 7, 1));
|
|
|
|
$thisfile_audio['channels'] = ($ThisBlock['stereo'] ? 2 : 1);
|
|
$thisfile_audio['sample_rate'] = getid3_lib::trunc((256000000 / (65536 - $ThisBlock['time_constant'])) / $thisfile_audio['channels']);
|
|
break;
|
|
|
|
case 9: // data block that supersedes blocks 1 and 8. Used for stereo, 16 bit
|
|
$BlockData .= $this->fread(12);
|
|
if ($info['avdataoffset'] <= $OriginalAVdataOffset) {
|
|
$info['avdataoffset'] = $this->ftell();
|
|
}
|
|
$this->fseek($BlockSize - 12, SEEK_CUR);
|
|
|
|
$ThisBlock['sample_rate'] = getid3_lib::LittleEndian2Int(substr($BlockData, 4, 4));
|
|
$ThisBlock['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($BlockData, 8, 1));
|
|
$ThisBlock['channels'] = getid3_lib::LittleEndian2Int(substr($BlockData, 9, 1));
|
|
$ThisBlock['wFormat'] = getid3_lib::LittleEndian2Int(substr($BlockData, 10, 2));
|
|
|
|
$ThisBlock['compression_name'] = $this->VOCwFormatLookup($ThisBlock['wFormat']);
|
|
if ($this->VOCwFormatActualBitsPerSampleLookup($ThisBlock['wFormat'])) {
|
|
$thisfile_voc['compressed_bits_per_sample'] = $this->VOCwFormatActualBitsPerSampleLookup($ThisBlock['wFormat']);
|
|
}
|
|
|
|
$thisfile_audio['sample_rate'] = $ThisBlock['sample_rate'];
|
|
$thisfile_audio['bits_per_sample'] = $ThisBlock['bits_per_sample'];
|
|
$thisfile_audio['channels'] = $ThisBlock['channels'];
|
|
break;
|
|
|
|
default:
|
|
$info['warning'][] = 'Unhandled block type "'.$BlockType.'" at offset '.$BlockOffset;
|
|
$this->fseek($BlockSize, SEEK_CUR);
|
|
break;
|
|
}
|
|
|
|
if (!empty($ThisBlock)) {
|
|
$ThisBlock['block_offset'] = $BlockOffset;
|
|
$ThisBlock['block_size'] = $BlockSize;
|
|
$ThisBlock['block_type_id'] = $BlockType;
|
|
$thisfile_voc['blocks'][] = $ThisBlock;
|
|
}
|
|
|
|
} while (!feof($this->getid3->fp) && ($BlockType != 0));
|
|
|
|
// Terminator block doesn't have size field, so seek back 3 spaces
|
|
$this->fseek(-3, SEEK_CUR);
|
|
|
|
ksort($thisfile_voc['blocktypes']);
|
|
|
|
if (!empty($thisfile_voc['compressed_bits_per_sample'])) {
|
|
$info['playtime_seconds'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / ($thisfile_voc['compressed_bits_per_sample'] * $thisfile_audio['channels'] * $thisfile_audio['sample_rate']);
|
|
$thisfile_audio['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
public function VOCcompressionTypeLookup($index) {
|
|
static $VOCcompressionTypeLookup = array(
|
|
0 => '8-bit',
|
|
1 => '4-bit',
|
|
2 => '2.6-bit',
|
|
3 => '2-bit'
|
|
);
|
|
return (isset($VOCcompressionTypeLookup[$index]) ? $VOCcompressionTypeLookup[$index] : 'Multi DAC ('.($index - 3).') channels');
|
|
}
|
|
|
|
public function VOCwFormatLookup($index) {
|
|
static $VOCwFormatLookup = array(
|
|
0x0000 => '8-bit unsigned PCM',
|
|
0x0001 => 'Creative 8-bit to 4-bit ADPCM',
|
|
0x0002 => 'Creative 8-bit to 3-bit ADPCM',
|
|
0x0003 => 'Creative 8-bit to 2-bit ADPCM',
|
|
0x0004 => '16-bit signed PCM',
|
|
0x0006 => 'CCITT a-Law',
|
|
0x0007 => 'CCITT u-Law',
|
|
0x2000 => 'Creative 16-bit to 4-bit ADPCM'
|
|
);
|
|
return (isset($VOCwFormatLookup[$index]) ? $VOCwFormatLookup[$index] : false);
|
|
}
|
|
|
|
public function VOCwFormatActualBitsPerSampleLookup($index) {
|
|
static $VOCwFormatLookup = array(
|
|
0x0000 => 8,
|
|
0x0001 => 4,
|
|
0x0002 => 3,
|
|
0x0003 => 2,
|
|
0x0004 => 16,
|
|
0x0006 => 8,
|
|
0x0007 => 8,
|
|
0x2000 => 4
|
|
);
|
|
return (isset($VOCwFormatLookup[$index]) ? $VOCwFormatLookup[$index] : false);
|
|
}
|
|
|
|
}
|