PHP Gets Information About Audio Files_PHP Tutorial-PHP Tutorial-php.cn

PHP obtains relevant information of audio files

This article mainly introduces the relevant information of PHP obtaining relevant information of audio files. It is very practical. Friends in need can refer to it. Down.

Project requirements: There is now a function to upload audio files. After uploading, PHP needs to obtain the relevant information of the audio file, such as: duration, etc. Since this file is placed on the purchased space, there is no such thing as ffmpeg extension to handle it, can PHP get this information?

The following is an implementation of reading and writing audio file header information using PHP that was used in the project before, mainly for WMA and MP3 formats, for reference.

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

509

510

511

512

513

514

515

516

517

518

519

520

521

522

523

524

525

526

527

528

529

530

531

532

533

534

535

536

537

538

539

540

541

542

543

544

545

546

547

548

549

550

551

552

553

554

555

556

557

558

559

560

561

562

563

564

565

566

567

568

569

570

571

572

573

574

575

576

577

578

579

580

581

582

583

584

585

586

587

588

589

590

591

592

593

594

595

596

597

598

599

600

601

602

603

604

605

606

607

608

609

610

611

612

613

614

615

616

617

618

619

620

621

622

623

624

625

626

627

628

629

630

631

632

633

634

635

636

637

638

639

640

641

642

643

644

645

646

647

648

649

650

651

652

653

654

655

656

657

658

659

660

661

662

663

664

665

666

667

668

669

670

671

672

673

674

675

676

677

678

679

680

681

682

683

684

685

686

687

688

689

690

691

692

693

694

695

696

697

698

699

700

701

702

703

704

705

706

707

708

709

710

711

712

713

714

715

716

717

718

719

720

721

722

// AudioExif.class.php

// 用PHP进行音频文件头部信息的读取与写入

// 目前只支持 WMA 和 MP3 两种格式, 只支持常用的几个头部信息

// 写入信息支持: Title(名称), Artist(艺术家), Copyright(版权), Description (描述)

// Year(年代), Genre (流派), AlbumTitle (专辑标题)

// 其中 mp3 和 wma 略有不同, 具体返回的信息还可能更多, 但只有以上信息可以被写入

// mp3 还支持 Track (曲目编号写入)

// 对于 MP3 文件支持 ID3v1也支持ID3v2, 读取时优先 v2, 写入时总是会写入v1, 必要时写入v2

// 用法说明: (由于 wma 使用 Unicode 存取, 故还需要 mb_convert_encoding() 扩展

// 返回数据及写入数据均为 ANSI 编码, 即存什么就显示什么 (中文_GB2312)

// require ('AudioExif.class.php');

// $AE = new AudioExif;

// $file = '/path/to/test.mp3';

// 1. 检查文件是否完整 (only for wma, mp3始终返回 true)

// $AE->CheckSize($file);

// 2. 读取信息, 返回值由信息组成的数组, 键名解释参见上方

// print_r($AE->GetInfo($file));

// 3. 写入信息, 第二参数是一个哈希数组, 键->值, 支持的参见上方的, mp3也支持 Track

// 要求第一参数的文件路径可由本程序写入

// $pa = array('Title' => '新标题', 'AlbumTitle' => '新的专辑名称');

// $AE->SetInfo($file, $pa);

// 其它: 该插件花了不少时间搜集查找 wma及mp3 的文件格式说明文档与网页, 希望对大家有用.

// 其实网上已经有不少类似的程序, 但对 wma 实在太少了, 只能在 win 平台下通过 M$ 的

// API 来操作, 而 MP3 也很少有可以在 unix/linux 命令行操作的, 所以特意写了这个模块

// 如果发现 bug 或提交 patch, 或加以改进使它更加健壮, 请告诉我.

// (You should be able to find reference materials on the Internet about the file format and structure of ID3 and Wma)

if (!extension_loaded('mbstring')){

trigger_error('PHP Extension module `mbstring` is required for AudioExif', E_USER_WARNING);

return true;

}

// the Main Class

class AudioExif{

// public vars

var $_wma = false;

var $_mp3 = false;

// Construct

function AudioExif() {

// nothing to do

}

// check the filesize

function CheckSize($file) {

$handler = &$this->_get_handler($file);

if (!$handler) return false;

return $handler->check_size($file);

}

// get the infomations

function GetInfo($file) {

$handler = &$this->_get_handler($file);

if (!$handler) return false;

return $handler->get_info($file);

}

// write the infomations

function SetInfo($file, $pa) {

if (!is_writable($file)) {

trigger_error('AudioExif: file `' . $file . '' can not be overwritten', E_USER_WARNING);

return false;

}

$handler = &$this->_get_handler($file);

if (!$handler) return false;

return $handler->set_info($file, $pa);

}

// private methods

function &_get_handler($file) {

$ext = strtolower(strrchr($file, '.'));

$ret = false;

if ($ext == '.mp3') {

// MP3

$ret = &$this->_mp3;

if (!$ret) $ret = new _Mp3Exif();

}

else if ($ext == '.wma')

{ // wma

$ret = &$this->_wma;

if (!$ret) $ret = new _WmaExif();

}

else

{ // unknown

trigger_error('AudioExif not supported `' . $ext . '' file.', E_USER_WARNING);

}

return $ret;

}

// DBCS => gb2312

function dbcs_gbk($str)

{

// strip the last "

$str = substr($str, 0, -2);

return mb_convert_encoding($str, 'GBK', 'UCS-2LE');

}

// gb2312 => DBCS

function gbk_dbcs($str)

{

$str = mb_convert_encoding($str, 'UCS-2LE', 'GBK');

$str .= "

return $str;

}

// file exif

class _AudioExif

{

var $fd;

var $head;

var $head_off;

var $head_buf;

// init the file handler

function _file_init($fpath, $write = false)

{

$mode = ($write ? 'rb ' : 'rb');

$this->fd = @fopen($fpath, $mode);

if (!$this->fd)

{

trigger_error('AudioExif: `' . $fpath . '' can not be opened with mode `' . $mode . '`', E_USER_WARNING);

return false;

}

$this->head = false;

$this->head_off = 0;

$this->head_buf = '';

return true;

}

// read buffer from the head_buf & move the off pointer

function _read_head_buf($len)

{

if ($len <= 0) return NULL;

$buf = substr($this->head_buf, $this->head_off, $len);

$this->head_off = strlen($buf);

return $buf;

}

// read one short value

function _read_head_short()

{

$ord1 = ord(substr($this->head_buf, $this->head_off, 1));

$ord2 = ord(substr($this->head_buf, $this->head_off 1, 1));

$this->head_off = 2;

return ($ord1 ($ord2<<8));

}

// save the file head

function _file_save($head, $olen, $nlen = 0)

{

if ($nlen == 0) $nlen = strlen($head);

if ($nlen == $olen)

{

// shorter

flock($this->fd, LOCK_EX);

fseek($this->fd, 0, SEEK_SET);

fwrite($this->fd, $head, $nlen);

flock($this->fd, LOCK_UN);

}

else

{

// longer, buffer required

$stat = fstat($this->fd);

$fsize = $stat['size'];

// buf required (4096?) 应该不会 nlen - olen > 4096 吧

$woff = 0;

$roff = $olen;

// read first buffer

flock($this->fd, LOCK_EX);

fseek($this->fd, $roff, SEEK_SET);

$buf = fread($this->fd, 4096);

// seek to start

fseek($this->fd, $woff, SEEK_SET);

fwrite($this->fd, $head, $nlen);

$woff = $nlen;

// seek to woff & write the data

{

$buf2 = $buf;

$roff = 4096;

if ($roff < $fsize)

{

fseek($this->fd, $roff, SEEK_SET);

$buf = fread($this->fd, 4096);

}

// save last buffer

$len2 = strlen($buf2);

fseek($this->fd, $woff, SEEK_SET);

fwrite($this->fd, $buf2, $len2);

$woff = $len2;

}

while ($roff < $fsize);

ftruncate($this->fd, $woff);

flock($this->fd, LOCK_UN);

}

// close the file

function _file_deinit()

{

if ($this->fd)

{

fclose($this->fd);

$this->fd = false;

}

// wma class

class _WmaExif extends _AudioExif

{

var $items1 = array('Title', 'Artist', 'Copyright', 'Description', 'Reserved');

var $items2 = array('Year', 'Genre', 'AlbumTitle');

// check file size (length) maybe invalid file

function check_size($file)

{

$ret = false;

if (!$this->_file_init($file)) return true;

if ($this->_init_header())

{

$buf = fread($this->fd, 24);

$tmp = unpack('H32id/Vlen/H8unused', $buf);

if ($tmp['id'] == '3626b2758e66cf11a6d900aa0062ce6c')

{

$stat = fstat($this->fd);

$ret = ($stat['size'] == ($this->head['len'] $tmp['len']));

}

$this->_file_deinit();

return $ret;

}

// set info (save the infos)

function set_info($file, $pa)

{

// check the pa

settype($pa, 'array');

if (!$this->_file_init($file, true)) return false;

if (!$this->_init_header())

{

$this->_file_deinit();

return false;

}

// parse the old header & generate the new header

$head_body = '';

$st_found = $ex_found = false;

$head_num = $this->head['num'];

while (($tmp = $this->_get_head_frame()) && ($head_num > 0))

{

$head_num--;

if ($tmp['id'] == '3326b2758e66cf11a6d900aa0062ce6c')

{ // Standard Info

// 1-4

$st_found = true;

$st_body1 = $st_body2 = '';

$lenx = unpack('v5', $this->_read_head_buf(10));

$tmp['len'] -= 34; // 10 24

for ($i = 0; $i < count($this->items1); $i )

{

$l = $lenx[$i 1];

$k = $this->items1[$i];

$tmp['len'] -= $l;

$data = $this->_read_head_buf($l);

if (isset($pa[$k])) $data = gbk_dbcs($pa[$k]);

$st_body2 .= $data;

$st_body1 .= pack('v', strlen($data));

}

// left length

if ($tmp['len'] > 0) $st_body2 .= $this->_read_head_buf($tmp['len']);

// save to head_body

$head_body .= pack('H32VH8', $tmp['id'], strlen($st_body1 . $st_body2) 24, $tmp['unused']);

$head_body .= $st_body1 . $st_body2;

$st_body2 .= $data;

}

// save to head_body

$head_body .= pack('H32Va4', '3326b2758e66cf11a6d900aa0062ce6c', strlen($st_body1 . $st_body2) 24, '');

$head_body .= $st_body1 . $st_body2;

$this->head['num'] ;

}

// ex not found?

if (!$ex_found)

{

$inum = 0;

$et_body = '';

foreach ($this->items2 as $k)

{

$nbuf = gbk_dbcs('WM/' . $k);

$vbuf = (isset($pa[$k]) ? gbk_dbcs($pa[$k]) : "");

$et_body .= pack('v', strlen($nbuf)) . $nbuf . pack('vv', 0, strlen($vbuf)) . $vbuf;

$inum ;

}

$head_body .= pack('H32Va4v', '40a4d0d207e3d21197f000a0c95ea850', strlen($et_body) 26, '', $inum);

$head_body .= $et_body;

$this->head['num'] ;

}

// after save

$new_len = strlen($head_body) 30;

$old_len = $this->head['len'];

if ($new_len < $old_len)

{

$head_body .= str_repeat("", $old_len - $new_len);

$new_len = $old_len;

}

$tmp = $this->head;

$head_buf = pack('H32VVVH4', $tmp['id'], $new_len, $tmp['len2'], $tmp['num'], $tmp['unused']);

$head_buf .= $head_body;

$this->_file_save($head_buf, $old_len, $new_len);

// close the file & return

$this->_file_deinit();

return true;

}

// get info

function get_info($file)

{

$ret = array();

if (!$this->_file_init($file)) return false;

if (!$this->_init_header())

{

$this->_file_deinit();

return false;

}

// get the data from head_buf

$head_num = $this->head['num']; // num of head_frame

while (($tmp = $this->_get_head_frame()) && $head_num > 0)

{

$head_num--;

if ($tmp['id'] == '3326b2758e66cf11a6d900aa0062ce6c')

{ // Standard Info

$lenx = unpack('v*', $this->_read_head_buf(10));

for ($i = 1; $i <= count($this->items1); $i )

{

$k = $this->items1[$i-1];

$ret[$k] = dbcs_gbk($this->_read_head_buf($lenx[$i]));

}

else if ($tmp['id'] == '40a4d0d207e3d21197f000a0c95ea850')

{ // Extended Info

$inum = $this->_read_head_short();

$tmp['len'] -= 26;

while ($inum > 0 && $tmp['len'] > 0)

{

// attribute name

$nlen = $this->_read_head_short();

$nbuf = $this->_read_head_buf($nlen);

// the flag & value length

$flag = $this->_read_head_short();

$vlen = $this->_read_head_short();

$vbuf = $this->_read_head_buf($vlen);

// update the XX

$tmp['len'] -= (6 $nlen $vlen);

$inum--;

$name = dbcs_gbk($nbuf);

$k = substr($name, 3);

if (in_array($k, $this->items2))

{ // all is string value (refer to falg for other tags)

$ret[$k] = dbcs_gbk($vbuf);

}

else

{ // skip only

if ($tmp['len'] > 24) $this->head_off = ($tmp['len'] - 24);

}

$this->_file_deinit();

return $ret;

}

// get the header?

function _init_header()

{

fseek($this->fd, 0, SEEK_SET);

$buf = fread($this->fd, 30);

if (strlen($buf) != 30) return false;

$tmp = unpack('H32id/Vlen/Vlen2/Vnum/H4unused', $buf);

if ($tmp['id'] != '3026b2758e66cf11a6d900aa0062ce6c')

return false;

$this->head_buf = fread($this->fd, $tmp['len'] - 30);

$this->head = $tmp;

return true;

}

// _get_head_frame()

function _get_head_frame()

{

$buf = $this->_read_head_buf(24);

if (strlen($buf) != 24) return false;

$tmp = unpack('H32id/Vlen/H8unused', $buf);

return $tmp;

}

// mp3 class (if not IDv2 then select IDv1)

class _Mp3Exif extends _AudioExif

{

var $head1;

var $genres = array('Blues','Classic Rock','Country','Dance','Disco','Funk','Grunge','Hip-Hop','Jazz','Metal','New Age','Oldies','Other','Pop','R&B','Rap','Reggae','Rock','Techno','Industrial','Alternative','Ska','Death Metal','Pranks','Soundtrack','Euro-Techno','Ambient','Trip-Hop','Vocal','Jazz Funk','Fusion','Trance','Classical','Instrumental','Acid','House','Game','Sound Clip','Gospel','Noise','AlternRock','Bass','Soul','Punk','Space','Meditative','Instrumental Pop','Instrumental Rock','Ethnic','Gothic','Darkwave','Techno-Industrial','Electronic','Pop-Folk','Eurodance','Dream','Southern Rock','Comedy','Cult','Gangsta','Top 40','Christian Rap','Pop/Funk','Jungle','Native American','Cabaret','New Wave','Psychadelic','Rave','Showtunes','Trailer','Lo-Fi','Tribal','Acid Punk','Acid Jazz','Polka','Retro','Musical','Rock & Roll','Hard Rock','Unknown');

// MP3 always return true

function check_size($file)

{

return true;

}

// get info

function get_info($file)

{

if (!$this->_file_init($file)) return false;

$ret = false;

if ($this->_init_header())

{