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<?php
/*
Copyright 2001 - 2007 Ampache.org
All Rights Reserved
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/**
* gc_now_playing
* this is a garbage collection function for now playing this is called every time something
* is streamed
* @package General
* @catagory Now Playing
*/
function gc_now_playing() {
// Delete expired songs
$sql = "DELETE FROM `now_playing` WHERE `expire` < '$time'";
$db_result = Dba::query($sql);
// Remove any now playing entries for session_streams that have been GC'd
$sql = "DELETE FROM `now_playing` USING `now_playing` " .
"LEFT JOIN `session_stream` ON `session_stream`.`id`=`now_playing`.`id` " .
"WHERE `session_stream`.`id` IS NULL";
$db_results = Dba::query($sql);
} // gc_now_playing
/**
* insert_now_playing
* This function takes care of inserting the now playing data
* we use this function because we need to do thing differently
* depending upon which play is actually streaming
*/
function insert_now_playing($song_id,$uid,$song_length,$sid) {
$time = time()+$song_length;
$session_id = Dba::escape($sid);
// Do a replace into ensuring that this client always only has a single row
$sql = "REPLACE INTO `now_playing` (`id`,`song_id`, `user`, `expire`)" .
" VALUES ('$session_id','$song_id', '$uid', '$time')";
$db_result = Dba::query($sql);
} // insert_now_playing
/**
* clear_now_playing
* There really isn't anywhere else for this function, shouldn't have deleted it in the first
* place
*/
function clear_now_playing() {
$sql = "TRUNCATE `now_playing`";
$db_results = Dba::query($sql);
return true;
} // clear_now_playing
/**
* show_now_playing
* shows the now playing template
*/
function show_now_playing() {
$web_path = Config::get('web_path');
$results = get_now_playing();
require Config::get('prefix') . '/templates/show_now_playing.inc.php';
} // show_now_playing
/**
* get_now_playing
* gets the now playing information
*/
function get_now_playing($filter='') {
$sql = "SELECT `session_stream`.`agent`,`now_playing`.`song_id`,`now_playing`.`user` FROM `now_playing` " .
"LEFT JOIN `session_stream` ON `session_stream`.`id`=`now_playing`.`id` " .
"ORDER BY `now_playing`.`expire` DESC";
$db_results = Dba::query($sql);
$results = array();
/* While we've got stuff playing */
while ($r = Dba::fetch_assoc($db_results)) {
$song = new Song($r['song_id']);
$song->format();
$np_user = new User($r['user']);
$results[] = array('song'=>$song,'user'=>$np_user,'agent'=>$r['agent']);
} // end while
return $results;
} // get_now_playing
/**
* check_lock_songs
* This checks to see if the song is already playing, if it is then it prevents the user
* from streaming it
*/
function check_lock_songs($song_id) {
$sql = "SELECT `song_id` FROM `now_playing` " .
"WHERE `song_id` = '$song_id'";
$db_results = Dba::query($sql);
if (Dba::num_rows($db_results)) {
debug_event('lock_songs','Song Already Playing, skipping...','5');
return false;
}
return true;
} // check_lock_songs
/**
* start_downsample
* This is a rather complext function that starts the downsampling of a song and returns the
* opened file handled
*/
function start_downsample($song,$now_playing_id=0,$song_name=0) {
/* Check to see if bitrates are set if so let's go ahead and optomize! */
$max_bitrate = Config::get('max_bit_rate');
$min_bitrate = Config::get('min_bit_rate');
$time = time();
$user_sample_rate = $GLOBALS['user']->prefs['sample_rate'];
$browser = new Browser();
if (!$song_name) {
$song_name = $song->f_artist_full . " - " . $song->title . "." . $song->type;
}
if ($max_bitrate > 1 AND $min_bitrate < $max_bitrate) {
$last_seen_time = $time - 1200; //20 min.
$sql = "SELECT COUNT(*) FROM now_playing, user_preference, preferences " .
"WHERE preferences.name = 'play_type' AND user_preference.preference = preferences.id " .
"AND now_playing.user = user_preference.user AND user_preference.value='downsample'";
$db_results = Dba::query($sql);
$results = Dba::fetch_row($db_results);
// Current number of active streams (current is already in now playing)
$active_streams = $results[0];
/* If only one user, they'll get all available. Otherwise split up equally. */
$sample_rate = floor($max_bitrate/$active_streams);
/* If min_bitrate is set, then we'll exit if the bandwidth would need to be split up smaller than the min. */
if ($min_bitrate > 1 AND ($max_bitrate/$active_streams) < $min_bitrate) {
/* Log the failure */
debug_event('downsample',"Error: Max bandwidith already allocated. $active_streams Active Streams",'2');
/* Toast the now playing entry, then tell em to try again later */
delete_now_playing($now_playing_id);
echo "Maximum bandwidth already allocated. Try again later.";
exit();
}
else {
$sample_rate = floor($max_bitrate/$active_streams);
} // end else
// Never go over the users sample rate
if ($sample_rate > $user_sample_rate) { $sample_rate = $user_sample_rate; }
debug_event('downsample',"Downsampled: $active_streams current active streams, downsampling to $sample_rate",'2');
} // end if we've got bitrates
else {
$sample_rate = $user_sample_rate;
}
/* Validate the bitrate */
$sample_rate = validate_bitrate($sample_rate);
/* Never Upsample a song */
if (($sample_rate*1000) > $song->bitrate) {
$sample_rate = validate_bitrate($song->bitrate)/1000;
$sample_ratio = '1';
}
else {
/* Set the Sample Ratio */
$sample_ratio = $sample_rate/($song->bitrate/1000);
}
header("Content-Length: " . intval($sample_ratio*$song->size));
$browser->downloadHeaders($song_name, $song->mime, false,$sample_ratio*$song->size);
/* Get Offset */
$offset = ( $start*$song->time )/( $sample_ratio*$song->size );
$offsetmm = floor($offset/60);
$offsetss = floor($offset-$offsetmm*60);
$offset = sprintf("%02d.%02d",$offsetmm,$offsetss);
/* Get EOF */
$eofmm = floor($song->time/60);
$eofss = floor($song->time-$eofmm*60);
$eof = sprintf("%02d.%02d",$eofmm,$eofss);
$song_file = escapeshellarg($song->file);
/* Replace Variables */
$downsample_command = Config::get($song->stream_cmd());
$downsample_command = str_replace("%FILE%",$song_file,$downsample_command);
$downsample_command = str_replace("%OFFSET%",$offset,$downsample_command);
$downsample_command = str_replace("%EOF%",$eof,$downsample_command);
$downsample_command = str_replace("%SAMPLE%",$sample_rate,$downsample_command);
// If we are debugging log this event
$message = "Start Downsample: $downsample_command";
debug_event('downsample',$message,'3');
$fp = @popen($downsample_command, 'rb');
/* We need more than just the handle here */
$return_array['handle'] = $fp;
$return_array['size'] = $sample_ratio*$song->size;
return ($return_array);
} // start_downsample
/**
* validate_bitrate
* this function takes a bitrate and returns a valid one
* @package Stream
* @catagory Downsample
*/
function validate_bitrate($bitrate) {
// Setup an array of valid bitrates for Lame (yea yea, others might be different :P)
$valid_rate = array('32','40','56','64','80','96','112','128','160','192','224','256','320');
/* Round to standard bitrates */
$sample_rate = 8*(floor($bitrate/8));
if (in_array($sample_rate,$valid_rate)) {
return $sample_rate;
}
/* See if it's less than the lowest one */
if ($sample_rate < $valid_rate['0']) {
return $valid_rate['0'];
}
/* Check to see if it's over 320 */
if ($sample_rate > 320) {
return '320';
}
foreach ($valid_rate as $key=>$rate) {
$next_key = $key+1;
if ($sample_rate > $rate AND $sample_rate < $valid_rate[$next_key]) {
return $rate;
}
} // end foreach
} // validate_bitrate
?>
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