| <Website> | getID3 |  |
|
| Size: | 5693 |
| Storage flags: | strip |
<?php
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;
}
$thisfile_audio = &$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;
$thisfile_audio['bits_per_sample'] = 8;
$thisfile_voc['header']['datablock_offset'] = getid3_lib::LittleEndian2Int(substr($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:
break;
case 1:
$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', '', $ThisBlock['compression_name']));
}
if (empty($thisfile_audio['sample_rate'])) {
$thisfile_audio['sample_rate'] = getid3_lib::trunc((1000000 / (256 - $ThisBlock['sample_rate_id'])) / $thisfile_audio['channels']);
}
break;
case 2:
case 3:
case 4:
case 6:
case 7:
$this->fseek($BlockSize, SEEK_CUR);
break;
case 8:
$BlockData .= $this->fread(4);
$ThisBlock['time_constant'] = getid3_lib::LittleEndian2Int(substr($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:
$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));
$this->fseek(-3, SEEK_CUR);
ksort($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);
}
}