--- /dev/null
+<?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) {
+ $this->error('Expecting "'.getid3_lib::PrintHexBytes($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:
+ $this->warning('Unhandled block type "'.$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);
+ }
+
+}
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