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- <?php
- class getid3_voc
- {
- function getid3_voc(&$fd, &$ThisFileInfo) {
- $OriginalAVdataOffset = $ThisFileInfo['avdataoffset'];
- fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
- $VOCheader = fread($fd, 26);
- if (substr($VOCheader, 0, 19) != 'Creative Voice File') {
- $ThisFileInfo['error'][] = 'Expecting "Creative Voice File" at offset '.$ThisFileInfo['avdataoffset'].', found "'.substr($VOCheader, 0, 19).'"';
- return false;
- }
-
- $thisfile_audio = &$ThisFileInfo['audio'];
- $ThisFileInfo['voc'] = array();
- $thisfile_voc = &$ThisFileInfo['voc'];
- $ThisFileInfo['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 {
- $BlockOffset = ftell($fd);
- $BlockData = fread($fd, 4);
- $BlockType = ord($BlockData{0});
- $BlockSize = getid3_lib::LittleEndian2Int(substr($BlockData, 1, 3));
- $ThisBlock = array();
- @$thisfile_voc['blocktypes'][$BlockType]++;
- switch ($BlockType) {
- case 0:
-
- break;
- case 1:
- $BlockData .= fread($fd, 2);
- if ($ThisFileInfo['avdataoffset'] <= $OriginalAVdataOffset) {
- $ThisFileInfo['avdataoffset'] = ftell($fd);
- }
- fseek($fd, $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'])) / $thisfile_audio['channels']);
- }
- break;
- case 2:
- case 3:
- case 4:
- case 6:
- case 7:
-
- fseek($fd, $BlockSize, SEEK_CUR);
- break;
- case 8:
- $BlockData .= fread($fd, 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:
- $BlockData .= fread($fd, 12);
- if ($ThisFileInfo['avdataoffset'] <= $OriginalAVdataOffset) {
- $ThisFileInfo['avdataoffset'] = ftell($fd);
- }
- fseek($fd, $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:
- $ThisFileInfo['warning'][] = 'Unhandled block type "'.$BlockType.'" at offset '.$BlockOffset;
- fseek($fd, $BlockSize, SEEK_CUR);
- break;
- }
- if (!empty($ThisBlock)) {
- $ThisBlock['block_offset'] = $BlockOffset;
- $ThisBlock['block_size'] = $BlockSize;
- $ThisBlock['block_type_id'] = $BlockType;
- $thisfile_voc['blocks'][] = $ThisBlock;
- }
- } while (!feof($fd) && ($BlockType != 0));
-
- fseek($fd, -3, SEEK_CUR);
- ksort($thisfile_voc['blocktypes']);
- if (!empty($thisfile_voc['compressed_bits_per_sample'])) {
- $ThisFileInfo['playtime_seconds'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / ($thisfile_voc['compressed_bits_per_sample'] * $thisfile_audio['channels'] * $thisfile_audio['sample_rate']);
- $thisfile_audio['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
- }
- return true;
- }
- function VOCcompressionTypeLookup($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 ('.($index - 3).') channels');
- }
- function VOCwFormatLookup($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);
- }
- 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);
- }
- }
- ?>
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