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