summaryrefslogtreecommitdiff
path: root/getid3/module.audio.la.php
diff options
context:
space:
mode:
Diffstat (limited to 'getid3/module.audio.la.php')
-rw-r--r--getid3/module.audio.la.php228
1 files changed, 228 insertions, 0 deletions
diff --git a/getid3/module.audio.la.php b/getid3/module.audio.la.php
new file mode 100644
index 0000000..c1d4f52
--- /dev/null
+++ b/getid3/module.audio.la.php
@@ -0,0 +1,228 @@
+<?php
+/////////////////////////////////////////////////////////////////
+/// getID3() by James Heinrich <info@getid3.org> //
+// available at http://getid3.sourceforge.net //
+// or http://www.getid3.org //
+/////////////////////////////////////////////////////////////////
+// See readme.txt for more details //
+/////////////////////////////////////////////////////////////////
+// //
+// module.audio.la.php //
+// module for analyzing LA audio files //
+// dependencies: module.audio.riff.php //
+// ///
+/////////////////////////////////////////////////////////////////
+
+getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
+
+class getid3_la
+{
+
+ function getid3_la(&$fd, &$ThisFileInfo) {
+ $offset = 0;
+ fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
+ $rawdata = fread($fd, GETID3_FREAD_BUFFER_SIZE);
+
+ switch (substr($rawdata, $offset, 4)) {
+ case 'LA02':
+ case 'LA03':
+ case 'LA04':
+ $ThisFileInfo['fileformat'] = 'la';
+ $ThisFileInfo['audio']['dataformat'] = 'la';
+ $ThisFileInfo['audio']['lossless'] = true;
+
+ $ThisFileInfo['la']['version_major'] = (int) substr($rawdata, $offset + 2, 1);
+ $ThisFileInfo['la']['version_minor'] = (int) substr($rawdata, $offset + 3, 1);
+ $ThisFileInfo['la']['version'] = (float) $ThisFileInfo['la']['version_major'] + ($ThisFileInfo['la']['version_minor'] / 10);
+ $offset += 4;
+
+ $ThisFileInfo['la']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
+ $offset += 4;
+ if ($ThisFileInfo['la']['uncompressed_size'] == 0) {
+ $ThisFileInfo['error'][] = 'Corrupt LA file: uncompressed_size == zero';
+ return false;
+ }
+
+ $WAVEchunk = substr($rawdata, $offset, 4);
+ if ($WAVEchunk !== 'WAVE') {
+ $ThisFileInfo['error'][] = 'Expected "WAVE" ('.getid3_lib::PrintHexBytes('WAVE').') at offset '.$offset.', found "'.$WAVEchunk.'" ('.getid3_lib::PrintHexBytes($WAVEchunk).') instead.';
+ return false;
+ }
+ $offset += 4;
+
+ $ThisFileInfo['la']['fmt_size'] = 24;
+ if ($ThisFileInfo['la']['version'] >= 0.3) {
+
+ $ThisFileInfo['la']['fmt_size'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
+ $ThisFileInfo['la']['header_size'] = 49 + $ThisFileInfo['la']['fmt_size'] - 24;
+ $offset += 4;
+
+ } else {
+
+ // version 0.2 didn't support additional data blocks
+ $ThisFileInfo['la']['header_size'] = 41;
+
+ }
+
+ $fmt_chunk = substr($rawdata, $offset, 4);
+ if ($fmt_chunk !== 'fmt ') {
+ $ThisFileInfo['error'][] = 'Expected "fmt " ('.getid3_lib::PrintHexBytes('fmt ').') at offset '.$offset.', found "'.$fmt_chunk.'" ('.getid3_lib::PrintHexBytes($fmt_chunk).') instead.';
+ return false;
+ }
+ $offset += 4;
+ $fmt_size = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
+ $offset += 4;
+
+ $ThisFileInfo['la']['raw']['format'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
+ $offset += 2;
+
+ $ThisFileInfo['la']['channels'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
+ $offset += 2;
+ if ($ThisFileInfo['la']['channels'] == 0) {
+ $ThisFileInfo['error'][] = 'Corrupt LA file: channels == zero';
+ return false;
+ }
+
+ $ThisFileInfo['la']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
+ $offset += 4;
+ if ($ThisFileInfo['la']['sample_rate'] == 0) {
+ $ThisFileInfo['error'][] = 'Corrupt LA file: sample_rate == zero';
+ return false;
+ }
+
+ $ThisFileInfo['la']['bytes_per_second'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
+ $offset += 4;
+ $ThisFileInfo['la']['bytes_per_sample'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
+ $offset += 2;
+ $ThisFileInfo['la']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
+ $offset += 2;
+
+ $ThisFileInfo['la']['samples'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
+ $offset += 4;
+
+ $ThisFileInfo['la']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 1));
+ $offset += 1;
+ $ThisFileInfo['la']['flags']['seekable'] = (bool) ($ThisFileInfo['la']['raw']['flags'] & 0x01);
+ if ($ThisFileInfo['la']['version'] >= 0.4) {
+ $ThisFileInfo['la']['flags']['high_compression'] = (bool) ($ThisFileInfo['la']['raw']['flags'] & 0x02);
+ }
+
+ $ThisFileInfo['la']['original_crc'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
+ $offset += 4;
+
+ // mikeØbevin*de
+ // Basically, the blocksize/seekevery are 61440/19 in La0.4 and 73728/16
+ // in earlier versions. A seekpoint is added every blocksize * seekevery
+ // samples, so 4 * int(totalSamples / (blockSize * seekEvery)) should
+ // give the number of bytes used for the seekpoints. Of course, if seeking
+ // is disabled, there are no seekpoints stored.
+ if ($ThisFileInfo['la']['version'] >= 0.4) {
+ $ThisFileInfo['la']['blocksize'] = 61440;
+ $ThisFileInfo['la']['seekevery'] = 19;
+ } else {
+ $ThisFileInfo['la']['blocksize'] = 73728;
+ $ThisFileInfo['la']['seekevery'] = 16;
+ }
+
+ $ThisFileInfo['la']['seekpoint_count'] = 0;
+ if ($ThisFileInfo['la']['flags']['seekable']) {
+ $ThisFileInfo['la']['seekpoint_count'] = floor($ThisFileInfo['la']['samples'] / ($ThisFileInfo['la']['blocksize'] * $ThisFileInfo['la']['seekevery']));
+
+ for ($i = 0; $i < $ThisFileInfo['la']['seekpoint_count']; $i++) {
+ $ThisFileInfo['la']['seekpoints'][] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
+ $offset += 4;
+ }
+ }
+
+ if ($ThisFileInfo['la']['version'] >= 0.3) {
+
+ // Following the main header information, the program outputs all of the
+ // seekpoints. Following these is what I called the 'footer start',
+ // i.e. the position immediately after the La audio data is finished.
+ $ThisFileInfo['la']['footerstart'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
+ $offset += 4;
+
+ if ($ThisFileInfo['la']['footerstart'] > $ThisFileInfo['filesize']) {
+ $ThisFileInfo['warning'][] = 'FooterStart value points to offset '.$ThisFileInfo['la']['footerstart'].' which is beyond end-of-file ('.$ThisFileInfo['filesize'].')';
+ $ThisFileInfo['la']['footerstart'] = $ThisFileInfo['filesize'];
+ }
+
+ } else {
+
+ // La v0.2 didn't have FooterStart value
+ $ThisFileInfo['la']['footerstart'] = $ThisFileInfo['avdataend'];
+
+ }
+
+ if ($ThisFileInfo['la']['footerstart'] < $ThisFileInfo['avdataend']) {
+ if ($RIFFtempfilename = tempnam('*', 'id3')) {
+ if ($RIFF_fp = fopen($RIFFtempfilename, 'w+b')) {
+ $RIFFdata = 'WAVE';
+ if ($ThisFileInfo['la']['version'] == 0.2) {
+ $RIFFdata .= substr($rawdata, 12, 24);
+ } else {
+ $RIFFdata .= substr($rawdata, 16, 24);
+ }
+ if ($ThisFileInfo['la']['footerstart'] < $ThisFileInfo['avdataend']) {
+ fseek($fd, $ThisFileInfo['la']['footerstart'], SEEK_SET);
+ $RIFFdata .= fread($fd, $ThisFileInfo['avdataend'] - $ThisFileInfo['la']['footerstart']);
+ }
+ $RIFFdata = 'RIFF'.getid3_lib::LittleEndian2String(strlen($RIFFdata), 4, false).$RIFFdata;
+ fwrite($RIFF_fp, $RIFFdata, strlen($RIFFdata));
+ $dummy = $ThisFileInfo;
+ $dummy['filesize'] = strlen($RIFFdata);
+ $dummy['avdataoffset'] = 0;
+ $dummy['avdataend'] = $dummy['filesize'];
+
+ $riff = new getid3_riff($RIFF_fp, $dummy);
+ if (empty($dummy['error'])) {
+ $ThisFileInfo['riff'] = $dummy['riff'];
+ } else {
+ $ThisFileInfo['warning'][] = 'Error parsing RIFF portion of La file: '.implode($dummy['error']);
+ }
+ unset($riff);
+ unset($dummy);
+ fclose($RIFF_fp);
+ }
+ unlink($RIFFtempfilename);
+ }
+ }
+
+ // $ThisFileInfo['avdataoffset'] should be zero to begin with, but just in case it's not, include the addition anyway
+ $ThisFileInfo['avdataend'] = $ThisFileInfo['avdataoffset'] + $ThisFileInfo['la']['footerstart'];
+ $ThisFileInfo['avdataoffset'] = $ThisFileInfo['avdataoffset'] + $offset;
+
+ //$ThisFileInfo['la']['codec'] = RIFFwFormatTagLookup($ThisFileInfo['la']['raw']['format']);
+ $ThisFileInfo['la']['compression_ratio'] = (float) (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) / $ThisFileInfo['la']['uncompressed_size']);
+ $ThisFileInfo['playtime_seconds'] = (float) ($ThisFileInfo['la']['samples'] / $ThisFileInfo['la']['sample_rate']) / $ThisFileInfo['la']['channels'];
+ if ($ThisFileInfo['playtime_seconds'] == 0) {
+ $ThisFileInfo['error'][] = 'Corrupt LA file: playtime_seconds == zero';
+ return false;
+ }
+
+ $ThisFileInfo['audio']['bitrate'] = ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8 / $ThisFileInfo['playtime_seconds'];
+ //$ThisFileInfo['audio']['codec'] = $ThisFileInfo['la']['codec'];
+ $ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['la']['bits_per_sample'];
+ break;
+
+ default:
+ if (substr($rawdata, $offset, 2) == 'LA') {
+ $ThisFileInfo['error'][] = 'This version of getID3() (v'.GETID3_VERSION.') doesn\'t support LA version '.substr($rawdata, $offset + 2, 1).'.'.substr($rawdata, $offset + 3, 1).' which this appears to be - check http://getid3.sourceforge.net for updates.';
+ } else {
+ $ThisFileInfo['error'][] = 'Not a LA (Lossless-Audio) file';
+ }
+ return false;
+ break;
+ }
+
+ $ThisFileInfo['audio']['channels'] = $ThisFileInfo['la']['channels'];
+ $ThisFileInfo['audio']['sample_rate'] = (int) $ThisFileInfo['la']['sample_rate'];
+ $ThisFileInfo['audio']['encoder'] = 'LA v'.$ThisFileInfo['la']['version'];
+
+ return true;
+ }
+
+}
+
+
+?> \ No newline at end of file
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-14 16:58:51 +0000