/**
*
*/
public function ChannelsBitratePlaytimeCalculations()
{
// set channelmode on audio
if (!empty($this->info['audio']['channelmode']) || !isset($this->info['audio']['channels'])) {
// ignore
} elseif ($this->info['audio']['channels'] == 1) {
$this->info['audio']['channelmode'] = 'mono';
} elseif ($this->info['audio']['channels'] == 2) {
$this->info['audio']['channelmode'] = 'stereo';
}
// Calculate combined bitrate - audio + video
$CombinedBitrate = 0;
$CombinedBitrate += isset($this->info['audio']['bitrate']) ? $this->info['audio']['bitrate'] : 0;
$CombinedBitrate += isset($this->info['video']['bitrate']) ? $this->info['video']['bitrate'] : 0;
if ($CombinedBitrate > 0 && empty($this->info['bitrate'])) {
$this->info['bitrate'] = $CombinedBitrate;
}
//if ((isset($this->info['video']) && !isset($this->info['video']['bitrate'])) || (isset($this->info['audio']) && !isset($this->info['audio']['bitrate']))) {
// // for example, VBR MPEG video files cannot determine video bitrate:
// // should not set overall bitrate and playtime from audio bitrate only
// unset($this->info['bitrate']);
//}
// video bitrate undetermined, but calculable
if (isset($this->info['video']['dataformat']) && $this->info['video']['dataformat'] && (!isset($this->info['video']['bitrate']) || $this->info['video']['bitrate'] == 0)) {
// if video bitrate not set
if (isset($this->info['audio']['bitrate']) && $this->info['audio']['bitrate'] > 0 && $this->info['audio']['bitrate'] == $this->info['bitrate']) {
// AND if audio bitrate is set to same as overall bitrate
if (isset($this->info['playtime_seconds']) && $this->info['playtime_seconds'] > 0) {
// AND if playtime is set
if (isset($this->info['avdataend']) && isset($this->info['avdataoffset'])) {
// AND if AV data offset start/end is known
// THEN we can calculate the video bitrate
$this->info['bitrate'] = round(($this->info['avdataend'] - $this->info['avdataoffset']) * 8 / $this->info['playtime_seconds']);
$this->info['video']['bitrate'] = $this->info['bitrate'] - $this->info['audio']['bitrate'];
}
}
}
}
if ((!isset($this->info['playtime_seconds']) || $this->info['playtime_seconds'] <= 0) && !empty($this->info['bitrate'])) {
$this->info['playtime_seconds'] = ($this->info['avdataend'] - $this->info['avdataoffset']) * 8 / $this->info['bitrate'];
}
if (!isset($this->info['bitrate']) && !empty($this->info['playtime_seconds'])) {
$this->info['bitrate'] = ($this->info['avdataend'] - $this->info['avdataoffset']) * 8 / $this->info['playtime_seconds'];
}
if (isset($this->info['bitrate']) && empty($this->info['audio']['bitrate']) && empty($this->info['video']['bitrate'])) {
if (isset($this->info['audio']['dataformat']) && empty($this->info['video']['resolution_x'])) {
// audio only
$this->info['audio']['bitrate'] = $this->info['bitrate'];
} elseif (isset($this->info['video']['resolution_x']) && empty($this->info['audio']['dataformat'])) {
// video only
$this->info['video']['bitrate'] = $this->info['bitrate'];
}
}
// Set playtime string
if (!empty($this->info['playtime_seconds']) && empty($this->info['playtime_string'])) {
$this->info['playtime_string'] = Helper::PlaytimeString($this->info['playtime_seconds']);
}
}
