हम कैमरे से वीडियो का उपयोग करते हुए DVR के माध्यम से PHP प्राप्त करते हैं

लोगों को यह जानकर आश्चर्य हो सकता है कि PHP मानक पुस्तकालय में पहले से ही सब कुछ है जो हमें इवेंट-संचालित और गैर-अवरुद्ध अनुप्रयोगों को लिखने की आवश्यकता है। हम इस क्षेत्र में केवल मूल PHP की कार्यक्षमता की सीमा तक पहुँचते हैं जब हम इसे एक ही समय में IO गतिविधि के लिए हजारों फ़ाइल डिस्क्रिप्टर के सर्वेक्षण के लिए कहते हैं। इस मामले में भी, हालांकि दोष PHP के साथ नहीं है, लेकिन अंतर्निहित सिस्टम चयन () कॉल जो लोड बढ़ने के साथ अपने प्रदर्शन में गिरावट में रैखिक है।

amphp.org/amp/event-loop

DVRIP

• 20 बाइट्स के हेडर, जो PHP में निर्दिष्ट किए जा सकते हैं
  
  

  unpack('Chead/Cversion/x2/IsessionId/Isequence/x2/SmsgId/Ilen', $buffer) 

• हेडर एक लंबे लेन संदेश के बाद होता है और इसमें दो बाइट्स \ x0a \ x00, या बाइनरी डेटा द्वारा पूरक या तो जसन हो सकता है।

 Loop::run(function () { $socket = yield connect("tcp://{$addr}:{$port}"); yield $socket->write('Hello'); while ($chunk = yield $socket->read()) { echo $chunk; } $socket->close(); }); 

 $socket = yield connect('tcp://192.168.0.200:34567'); 

 function sofiaHash(string $password) : string { $md5 = md5($password, true); return implode('', array_map(function ($i) use ($md5) { $c = (ord($md5[2 * $i]) + ord($md5[2 * $i + 1])) % 62; $c += $c > 9 ? ($c > 35 ? 61 : 55) : 48; return chr($c); }, range(0, 7))); } 

 class Packet { public const SUCCESS_CODES = [100, 515]; public const MESSAGE_CODES = [ 'packet.request.login' => 1000, 'packet.request.keepAlive' => 1006, 'packet.request.claim' => 1413, 'packet.response.login' => 1001, 'packet.response.keepAlive' => 1007, 'packet.response.claim' => 1414, 'packet.videoControl' => 1410, 'packet.binary' => 1412, ]; protected int $head = 255; protected int $version = 0; protected int $sessionId; protected int $sequence; protected int $msgId; protected ?string $rawData; protected ?array $data; public function __construct(int $msgId, ?array $data = null, int $sequence = 0, int $sessionId = 0) { $this->msgId = $msgId; $this->data = $data; $this->sequence = $sequence; $this->sessionId = $sessionId; } public function __toString() : string { if ($this->data !== null) { $this->rawData = json_encode($this->data, JSON_THROW_ON_ERROR) . "\x0a\x00"; } return pack('CCx2IIx2SI', $this->head, $this->version, $this->sessionId, $this->sequence, $this->msgId, strlen($this->rawData)) . $this->rawData; } public function getData() : ?array { return $this->data; } public function getRawData() : ?string { return $this->rawData; } public function getSession() : int { return $this->sessionId; } public function getSequence() : int { return $this->sequence; } public function getMessageType() : string { $types = array_flip(static::MESSAGE_CODES); if (!isset($types[$this->msgId])) { throw new \Exception('Unknown message type: ' . $this->msgId); } return $types[$this->msgId]; } } 

 yield $socket->write((string) new Packet(Packet::MESSAGE_CODES['packet.request.login'], [ 'EncryptType' => 'MD5', 'LoginType' => 'DVRIP-Web', 'PassWord' => sofiaHash('admin'), 'UserName' => 'admin', ])); 

 class Reader extends EventEmitter { protected InputStream $socket; public function __construct(InputStream $socket) { $this->socket = $socket; } public function start() : \Generator { $buffer = ''; while (!$this->socket->isClosed() && $result = yield Packet::read($this->socket, $buffer)) { [$packet, $chunk] = $result; $buffer = $chunk; $chunk = null; $this->emit('packet', [$packet]); $this->emit($packet->getMessageType(), [$packet]); } $buffer = null; } } 

 public static function read(InputStream $socket, string $buffer = '') : Promise { return call(function () use ($socket, $buffer) { $header = null; do { if ($header === null && strlen($buffer) > 20) { $header = unpack('Chead/Cversion/x2/IsessionId/Isequence/x2/SmsgId/Ilen', substr($buffer, 0, 20)); $buffer = substr($buffer, 20); } if ($header !== null && strlen($buffer) >= (int) $header['len']) { return [ static::fromRaw($header, (int) $header['len'] > 0 ? substr($buffer, 0, (int) $header['len']) : null), substr($buffer, (int) $header['len']) ]; } $buffer .= yield $socket->read(); } while (!$socket->isClosed()); }); } protected static function fromRaw(array $header, ?string $rawData) : self { $packet = new static($header['msgId'], null, $header['sequence'], $header['sessionId']); $packet->rawData = $rawData; $packet->data = (int) $packet->msgId === static::MESSAGE_CODES['packet.binary'] || $rawData === null ? null : json_decode(substr($rawData, 0, -2), true, 512, JSON_THROW_ON_ERROR); return $packet; } 

 $reader->on($packetType, $handler); 

 $reader = new Reader($socket = yield connect('tcp://10.0.5.100:49152')); $reader->on('packet.response.login', asyncCoroutine(function (Packet $packet) use ($socket) { if (empty($packet->getData()['Ret']) || !in_array($packet->getData()['Ret'], Packet::SUCCESS_CODES)) { throw new \Exception('Wrong login data'); } yield $socket->write((string) new Packet(Packet::MESSAGE_CODES['packet.request.claim'], [ 'Name' => 'OPMonitor', 'OPMonitor' => ['Action' => 'Claim', 'Parameter' => ['Channel' => 0, 'CombinMode' => 'NONE', 'StreamType' => 'Main', 'TransMode' => 'TCP']], ], 1, $packet->getSession())); })); $reader->once('packet.response.login', function (Packet $packet) use ($socket) { Loop::unreference(Loop::repeat($packet->getData()['AliveInterval'] * 1000, function ($watcherId) use ($socket, $packet) { if ($socket->getResource() === null) { return Loop::cancel($watcherId); } yield $socket->write((string) new Packet(Packet::MESSAGE_CODES['packet.request.keepAlive'], [ 'Name' => 'KeepAlive', 'SessionID' => $packet->getData()['SessionID'] ], 0, $packet->getSession())); })); }); $reader->on('packet.response.claim', asyncCoroutine(function (Packet $packet) use ($socket) { yield $socket->write((string) new Packet(Packet::MESSAGE_CODES['packet.videoControl'], [ 'Name' => 'OPMonitor', 'OPMonitor' => ['Action' => 'Start', 'Parameter' => ['Channel' => 0, 'CombinMode' => 'NONE', 'StreamType' => 'Main', 'TransMode' => 'TCP']], ], $packet->getSequence() + 1, $packet->getSession())); })); $emitter = new Emitter(); $reader->on('packet.binary', function ($packet) use ($emitter) { $emitter->emit($packet->getRawData()); }); $reader->once('packet.binary', function (Packet $packet) use ($socket) { $signalHandler = function () use ($socket, $packet) { yield $socket->write((string) new Packet(Packet::MESSAGE_CODES['packet.videoControl'], [ 'Name' => 'OPMonitor', 'OPMonitor' => ['Action' => 'Stop', 'Parameter' => ['Channel' => 0, 'CombinMode' => 'NONE', 'StreamType' => 'Main', 'TransMode' => 'TCP']], ], 0, $packet->getSession())); $socket->close(); }; Loop::unreference(Loop::onSignal(defined('SIGINT') ? SIGINT : 2, $signalHandler, 'SIGINT')); Loop::unreference(Loop::onSignal(defined('SIGTERM') ? SIGTERM : 15, $signalHandler, 'SIGTERM')); }); asyncCall([$reader, 'start']); yield $socket->write((string) new Packet(Packet::MESSAGE_CODES['packet.request.login'], [ 'EncryptType' => 'MD5', 'LoginType' => 'DVRIP-Web', 'PassWord' => sofiaHash('123qwea'), 'UserName' => 'admin', ])); yield pipe(new IteratorStream($emitter->iterate()), getStdout()); 

 <?php ini_set('display_errors', 'stderr'); use Amp\Emitter; use Amp\Loop; use Amp\Promise; use Amp\ByteStream\InputStream; use Amp\ByteStream\IteratorStream; use Evenement\EventEmitter; use function Amp\call; use function Amp\asyncCall; use function Amp\asyncCoroutine; use function Amp\ByteStream\getStderr; use function Amp\ByteStream\getStdout; use function Amp\ByteStream\pipe; use function Amp\Socket\connect; require 'vendor/autoload.php'; function sofiaHash(string $password) : string { $md5 = md5($password, true); return implode('', array_map(function ($i) use ($md5) { $c = (ord($md5[2 * $i]) + ord($md5[2 * $i + 1])) % 62; $c += $c > 9 ? ($c > 35 ? 61 : 55) : 48; return chr($c); }, range(0, 7))); } class Reader extends EventEmitter { protected InputStream $socket; public function __construct(InputStream $socket) { $this->socket = $socket; } public function start() : \Generator { $buffer = ''; while (!$this->socket->isClosed() && $result = yield Packet::read($this->socket, $buffer)) { [$packet, $chunk] = $result; $buffer = $chunk; $chunk = null; $this->emit('packet', [$packet]); $this->emit($packet->getMessageType(), [$packet]); } $buffer = null; } } class Packet { public const SUCCESS_CODES = [100, 515]; public const MESSAGE_CODES = [ 'packet.request.login' => 1000, 'packet.request.keepAlive' => 1006, 'packet.request.claim' => 1413, 'packet.response.login' => 1001, 'packet.response.keepAlive' => 1007, 'packet.response.claim' => 1414, 'packet.videoControl' => 1410, 'packet.binary' => 1412, ]; public static function read(InputStream $socket, string $buffer = '') : Promise { return call(function () use ($socket, $buffer) { $header = null; do { if ($header === null && strlen($buffer) > 20) { $header = unpack('Chead/Cversion/x2/IsessionId/Isequence/x2/SmsgId/Ilen', substr($buffer, 0, 20)); $buffer = substr($buffer, 20); } if ($header !== null && strlen($buffer) >= (int) $header['len']) { return [ static::fromRaw($header, (int) $header['len'] > 0 ? substr($buffer, 0, (int) $header['len']) : null), substr($buffer, (int) $header['len']) ]; } $buffer .= yield $socket->read(); } while (!$socket->isClosed()); }); } protected static function fromRaw(array $header, ?string $rawData) : self { $packet = new static($header['msgId'], null, $header['sequence'], $header['sessionId']); $packet->rawData = $rawData; $packet->data = (int) $packet->msgId === static::MESSAGE_CODES['packet.binary'] || $rawData === null ? null : json_decode(substr($rawData, 0, -2), true, 512, JSON_THROW_ON_ERROR); return $packet; } protected int $head = 255; protected int $version = 0; protected int $sessionId; protected int $sequence; protected int $msgId; protected ?string $rawData; protected ?array $data; public function __construct(int $msgId, ?array $data = null, int $sequence = 0, int $sessionId = 0) { $this->msgId = $msgId; $this->data = $data; $this->sequence = $sequence; $this->sessionId = $sessionId; } public function __toString() : string { if ($this->data !== null) { $this->rawData = json_encode($this->data, JSON_THROW_ON_ERROR) . "\x0a\x00"; } return pack('CCx2IIx2SI', $this->head, $this->version, $this->sessionId, $this->sequence, $this->msgId, strlen($this->rawData)) . $this->rawData; } public function getData() : ?array { return $this->data; } public function getRawData() : ?string { return $this->rawData; } public function getSession() : int { return $this->sessionId; } public function getSequence() : int { return $this->sequence; } public function getMessageType() : string { $types = array_flip(static::MESSAGE_CODES); if (!isset($types[$this->msgId])) { throw new \Exception('Unknown message type: ' . $this->msgId); } return $types[$this->msgId]; } } Loop::run(function () : \Generator { $reader = new Reader($socket = yield connect('tcp://10.0.5.100:49152')); $reader->on('packet.response.login', asyncCoroutine(function (Packet $packet) use ($socket) { if (empty($packet->getData()['Ret']) || !in_array($packet->getData()['Ret'], Packet::SUCCESS_CODES)) { throw new \Exception('Wrong login data'); } yield $socket->write((string) new Packet(Packet::MESSAGE_CODES['packet.request.claim'], [ 'Name' => 'OPMonitor', 'OPMonitor' => ['Action' => 'Claim', 'Parameter' => ['Channel' => 0, 'CombinMode' => 'NONE', 'StreamType' => 'Main', 'TransMode' => 'TCP']], ], 1, $packet->getSession())); })); $reader->once('packet.response.login', function (Packet $packet) use ($socket) { Loop::unreference(Loop::repeat($packet->getData()['AliveInterval'] * 1000, function ($watcherId) use ($socket, $packet) { if ($socket->getResource() === null) { return Loop::cancel($watcherId); } yield $socket->write((string) new Packet(Packet::MESSAGE_CODES['packet.request.keepAlive'], [ 'Name' => 'KeepAlive', 'SessionID' => $packet->getData()['SessionID'] ], 0, $packet->getSession())); })); }); $reader->on('packet.response.claim', asyncCoroutine(function (Packet $packet) use ($socket) { yield $socket->write((string) new Packet(Packet::MESSAGE_CODES['packet.videoControl'], [ 'Name' => 'OPMonitor', 'OPMonitor' => ['Action' => 'Start', 'Parameter' => ['Channel' => 0, 'CombinMode' => 'NONE', 'StreamType' => 'Main', 'TransMode' => 'TCP']], ], $packet->getSequence() + 1, $packet->getSession())); })); $emitter = new Emitter(); $reader->on('packet.binary', function ($packet) use ($emitter) { $emitter->emit($packet->getRawData()); }); $reader->once('packet.binary', function (Packet $packet) use ($socket) { $signalHandler = function () use ($socket, $packet) { yield $socket->write((string) new Packet(Packet::MESSAGE_CODES['packet.videoControl'], [ 'Name' => 'OPMonitor', 'OPMonitor' => ['Action' => 'Stop', 'Parameter' => ['Channel' => 0, 'CombinMode' => 'NONE', 'StreamType' => 'Main', 'TransMode' => 'TCP']], ], 0, $packet->getSession())); $socket->close(); }; Loop::unreference(Loop::onSignal(defined('SIGINT') ? SIGINT : 2, $signalHandler, 'SIGINT')); Loop::unreference(Loop::onSignal(defined('SIGTERM') ? SIGTERM : 15, $signalHandler, 'SIGTERM')); }); asyncCall([$reader, 'start']); yield $socket->write((string) new Packet(Packet::MESSAGE_CODES['packet.request.login'], [ 'EncryptType' => 'MD5', 'LoginType' => 'DVRIP-Web', 'PassWord' => sofiaHash('123qwea'), 'UserName' => 'admin', ])); yield pipe(new IteratorStream($emitter->iterate()), getStdout()); }); 

 $ php recorder.php > output.h264 

 $ php recorder.php | ffmpeg -nostdin -y -hide_banner -loglevel verbose -f h264 -i pipe:0 -pix_fmt yuv420p -c copy -movflags +frag_keyframe+empty_moov+default_base_moof -reset_timestamps 1 -f mpegts output.mpegts 

 $ php recorder.php | ffmpeg ... | curl -d @- ... 

क्यों?