/**
* Read media file information.
*
* @param string filename
* @return Naf_Media_Info
*/
function info($filename)
{
$i = new Naf_Media_Info($filename);
$cmd = new Naf_ShellCmd($this->command);
$cmd->addOption('-identify');
$cmd->addOption('-frames', 0);
$cmd->addOption('-ao', 'null');
$cmd->addOption('-vo', 'null');
$cmd->setTarget($filename);
$infoText = $cmd->exec();
$w = $h = 0;
foreach (preg_split("/\r\n|\r|\n/", $infoText) as $line) {
if (preg_match("/^ID_([^\\=]+)=(.+)\$/", $line, $matches)) {
$key = $matches[1];
$value = $matches[2];
if (0 === strpos($key, 'VIDEO')) {
$i->setHasVideo(true);
} elseif (0 === strpos($key, 'AUDIO')) {
$i->setHasAudio(true);
}
switch ($key) {
case "VIDEO_WIDTH":
$w = (int) $value;
break;
case "VIDEO_HEIGHT":
$h = (int) $value;
break;
case "VIDEO_FPS":
$i->setFps($value);
break;
case "AUDIO_BITRATE":
$i->setAudioBitrate($value / 1000);
break;
case "AUDIO_RATE":
$i->setSamplingRate($value);
break;
case "LENGTH":
$i->setDuration($value);
break;
case "AUDIO_CODEC":
$i->setAudioCodec($value);
break;
case "VIDEO_CODEC":
$i->setVideoCodec($value);
break;
default:
break;
}
} elseif (preg_match("/^([^\\s]+) file format detected/", $line, $matches)) {
$i->setFormat($matches[1]);
}
}
if ($i->hasVideo()) {
$i->setPixelSize($w, $h);
$duration = $i->getDuration();
if (0 == $duration) {
// experimentally it has been found that 5 seconds will be ok here...
$duration = 5;
}
$i->setBitrate(filesize($filename) / 1024 * 8 / $duration);
}
return $i;
}
