337 lines
8.8 KiB
PHP
337 lines
8.8 KiB
PHP
<?php
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declare(strict_types=1);
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namespace App\Radio\Backend;
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use App\Entity;
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use App\Event\Radio\WriteLiquidsoapConfiguration;
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use App\Exception;
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use App\Radio\Enums\LiquidsoapQueues;
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use LogicException;
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use Psr\Http\Message\UriInterface;
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use Symfony\Component\Process\Process;
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class Liquidsoap extends AbstractBackend
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{
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public function supportsMedia(): bool
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{
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return true;
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}
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public function supportsRequests(): bool
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{
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return true;
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}
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public function supportsStreamers(): bool
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{
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return true;
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}
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public function supportsWebStreaming(): bool
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{
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return true;
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}
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public function supportsImmediateQueue(): bool
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{
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return true;
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}
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/**
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* @inheritDoc
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*/
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public function getConfigurationPath(Entity\Station $station): ?string
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{
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return $station->getRadioConfigDir() . '/liquidsoap.liq';
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}
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/**
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* @inheritDoc
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*/
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public function getCurrentConfiguration(Entity\Station $station): ?string
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{
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$event = new WriteLiquidsoapConfiguration($station, false, true);
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$this->dispatcher->dispatch($event);
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return $event->buildConfiguration();
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}
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/**
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* Returns the port used for DJs/Streamers to connect to LiquidSoap for broadcasting.
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*
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* @param Entity\Station $station
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*
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* @return int The port number to use for this station.
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*/
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public function getStreamPort(Entity\Station $station): int
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{
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$djPort = $station->getBackendConfig()->getDjPort();
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if (null !== $djPort) {
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return $djPort;
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}
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// Default to frontend port + 5
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$frontend_config = $station->getFrontendConfig();
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$frontend_port = $frontend_config->getPort() ?? (8000 + (($station->getId() - 1) * 10));
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return $frontend_port + 5;
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}
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/**
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* Assemble a list of annotations for LiquidSoap.
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*
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* Liquidsoap expects a string similar to:
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* annotate:type="song",album="$ALBUM",display_desc="$FULLSHOWNAME",
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* liq_start_next="2.5",liq_fade_in="3.5",liq_fade_out="3.5":$SONGPATH
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*
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* @param Entity\StationMedia $media
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*
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* @return mixed[]
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*/
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public function annotateMedia(Entity\StationMedia $media): array
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{
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$annotations = [];
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$annotation_types = [
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'title' => $media->getTitle(),
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'artist' => $media->getArtist(),
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'duration' => $media->getLength(),
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'song_id' => $media->getSongId(),
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'media_id' => $media->getId(),
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'liq_amplify' => $media->getAmplify() ?? 0.0,
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'liq_cross_duration' => $media->getFadeOverlap(),
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'liq_fade_in' => $media->getFadeIn(),
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'liq_fade_out' => $media->getFadeOut(),
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'liq_cue_in' => $media->getCueIn(),
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'liq_cue_out' => $media->getCueOut(),
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];
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// Safety checks for cue lengths.
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if ($annotation_types['liq_cue_out'] < 0) {
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$cue_out = abs($annotation_types['liq_cue_out']);
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if (0.0 === $cue_out || $cue_out > $annotation_types['duration']) {
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$annotation_types['liq_cue_out'] = null;
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} else {
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$annotation_types['liq_cue_out'] = max(0, $annotation_types['duration'] - $cue_out);
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}
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}
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if ($annotation_types['liq_cue_out'] > $annotation_types['duration']) {
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$annotation_types['liq_cue_out'] = null;
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}
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if ($annotation_types['liq_cue_in'] > $annotation_types['duration']) {
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$annotation_types['liq_cue_in'] = null;
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}
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foreach ($annotation_types as $annotation_name => $prop) {
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if (null === $prop) {
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continue;
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}
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$prop = self::annotateString((string)$prop);
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// Convert Liquidsoap-specific annotations to floats.
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if ('duration' === $annotation_name || str_starts_with($annotation_name, 'liq')) {
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$prop = Liquidsoap\ConfigWriter::toFloat($prop);
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}
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if ('liq_amplify' === $annotation_name) {
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$prop .= 'dB';
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}
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$annotations[$annotation_name] = $prop;
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}
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return $annotations;
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}
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public static function annotateString(string $str): string
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{
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$str = mb_convert_encoding($str, 'UTF-8');
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return str_replace(['"', "\n", "\t", "\r"], ['\"', '', '', ''], $str);
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}
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/**
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* Execute the specified remote command on LiquidSoap via the telnet API.
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*
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* @param Entity\Station $station
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* @param string $command_str
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*
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* @return string[]
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*
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* @throws Exception
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*/
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public function command(Entity\Station $station, string $command_str): array
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{
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$socketPath = 'unix://' . $station->getRadioConfigDir() . '/liquidsoap.sock';
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$fp = stream_socket_client(
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$socketPath,
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$errno,
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$errstr,
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20
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);
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if (!$fp) {
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throw new Exception('Telnet failure: ' . $errstr . ' (' . $errno . ')');
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}
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fwrite($fp, str_replace(["\\'", '&'], ["'", '&'], urldecode($command_str)) . "\nquit\n");
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$response = [];
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while (!feof($fp)) {
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$response[] = trim(fgets($fp, 1024) ?: '');
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}
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fclose($fp);
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return $response;
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}
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/**
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* @inheritdoc
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*/
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public function getCommand(Entity\Station $station): ?string
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{
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if ($binary = $this->getBinary()) {
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$config_path = $station->getRadioConfigDir() . '/liquidsoap.liq';
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return $binary . ' ' . $config_path;
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}
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return null;
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}
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/**
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* @inheritDoc
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*/
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public function getBinary(): ?string
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{
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return '/usr/local/bin/liquidsoap';
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}
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public function getVersion(): ?string
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{
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$binary = $this->getBinary();
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if (null === $binary) {
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return null;
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}
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$process = new Process([$binary, '--version']);
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$process->run();
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if (!$process->isSuccessful()) {
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return null;
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}
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return preg_match('/^Liquidsoap (.+)$/im', $process->getOutput(), $matches)
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? $matches[1]
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: null;
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}
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public function isQueueEmpty(
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Entity\Station $station,
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LiquidsoapQueues $queue
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): bool {
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$queueResult = $this->command(
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$station,
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sprintf('%s.queue', $queue->value)
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);
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return empty($queueResult[0]);
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}
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/**
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* @return string[]
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*/
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public function enqueue(
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Entity\Station $station,
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LiquidsoapQueues $queue,
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string $music_file
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): array {
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return $this->command(
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$station,
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sprintf('%s.push %s', $queue->value, $music_file)
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);
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}
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/**
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* @return string[]
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*/
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public function skip(Entity\Station $station): array
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{
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return $this->command(
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$station,
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'interrupting_fallback.skip'
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);
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}
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/**
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* @return string[]
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*/
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public function updateMetadata(Entity\Station $station, array $newMeta): array
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{
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$metaStr = [];
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foreach ($newMeta as $metaKey => $metaVal) {
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$metaStr[] = $metaKey . '="' . self::annotateString($metaVal) . '"';
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}
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return $this->command(
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$station,
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'custom_metadata.insert ' . implode(',', $metaStr),
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);
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}
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/**
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* Tell LiquidSoap to disconnect the current live streamer.
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*
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* @param Entity\Station $station
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*
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* @return string[]
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*/
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public function disconnectStreamer(Entity\Station $station): array
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{
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$current_streamer = $station->getCurrentStreamer();
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$disconnect_timeout = $station->getDisconnectDeactivateStreamer();
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if ($current_streamer instanceof Entity\StationStreamer && $disconnect_timeout > 0) {
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$current_streamer->deactivateFor($disconnect_timeout);
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$this->em->persist($current_streamer);
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$this->em->flush();
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}
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return $this->command(
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$station,
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'input_streamer.stop'
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);
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}
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public function getWebStreamingUrl(Entity\Station $station, UriInterface $base_url): UriInterface
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{
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$stream_port = $this->getStreamPort($station);
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$djMount = $station->getBackendConfig()->getDjMountPoint();
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return $base_url
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->withScheme('wss')
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->withPath($base_url->getPath() . '/radio/' . $stream_port . $djMount);
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}
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public function verifyConfig(string $config): void
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{
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$binary = $this->getBinary();
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$process = new Process([
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$binary,
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'--check',
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'-',
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]);
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$process->setInput($config);
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$process->run();
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if (1 === $process->getExitCode()) {
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throw new LogicException($process->getOutput());
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}
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}
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}
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