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| 7 | <title>Audio Testing of VirtualBox</title>
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| 11 | :Author: David Goodger (goodger@python.org)
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| 12 | :Id: $Id: VBoxAudioValidationKitReadMe.html 98107 2023-01-17 22:56:50Z vboxsync $
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| 360 | </style>
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| 361 | </head>
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| 362 | <body>
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| 363 | <div class="document" id="audio-testing-of-virtualbox">
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| 364 | <h1 class="title">Audio Testing of VirtualBox</h1>
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| 365 |
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| 366 | <div class="section" id="overview-goal">
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| 367 | <h1>Overview / Goal</h1>
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| 368 | <p>The goal is to create a flexible testing framework to test the
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| 369 | VirtualBox audio stack.</p>
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| 370 | <p>It should be runnable with an easy-to-use setup so that also regular users
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| 371 | can perform tests on request, without having to install or set up additional
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| 372 | dependencies.</p>
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| 373 | <p>That framework must be runnable on all host/guest combinations together with all
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| 374 | audio drivers ("backends") and device emulations being offered. This makes it a
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| 375 | rather big testing matrix which therefore has to be processed in an automated
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| 376 | fashion.</p>
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| 377 | <p>Additionally it should be flexible enough to add more (custom) tests later on.</p>
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| 378 | </div>
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| 379 | <div class="section" id="operation">
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| 380 | <h1>Operation</h1>
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| 381 | <p>The framework consists of several components which try to make use as much of
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| 382 | the existing audio stack code as possible. This allows the following
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| 383 | operation modes:</p>
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| 384 | <dl class="docutils">
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| 385 | <dt>Standalone</dt>
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| 386 | <dd>Playing back / recording audio data (test tones / .WAV files) in a
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| 387 | standalone scenario, i.e. no VirtualBox / VMs required). This mode is using
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| 388 | VirtualBox' audio (mixing) stack and available backend drivers without the
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| 389 | need of VirtualBox being installed.</dd>
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| 390 | <dt>Manual</dt>
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| 391 | <dd>Performing single / multiple tests manually on a local machine.
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| 392 | Requires a running and set up test VM.</dd>
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| 393 | <dt>Automated</dt>
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| 394 | <dd>Performs single / multiple tests via the Validation Kit audio test
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| 395 | driver and can be triggered via the Validation Kit Test Manager.</dd>
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| 396 | <dt>(Re-)validation of previously ran tests</dt>
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| 397 | <dd>This takes two test sets and runs the validation / analysis on them.</dd>
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| 398 | <dt>Self testing mode</dt>
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| 399 | <dd>Performs standalone self tests to verify / debug the involved components.</dd>
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| 400 | </dl>
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| 401 | </div>
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| 402 | <div class="section" id="components-and-terminology">
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| 403 | <h1>Components and Terminology</h1>
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| 404 | <p>The following components are in charge for performing the audio tests
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| 405 | (depends on the operation mode, see above):</p>
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| 406 | <ul>
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| 407 | <li><p class="first">VBoxAudioTest (also known as VKAT, "Validation Kit Audio Test"):
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| 408 | A binary which can perform the standalone audio tests mentioned above, as well
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| 409 | as acting as the guest and host service(s) when performing manual or automated
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| 410 | tests. It also includes the analysis / verification of audio test sets.
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| 411 | VKAT also is included in host installations and Guest Additions since
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| 412 | VirtualBox 7.0 to give customers and end users the opportunity to test and
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| 413 | verify the audio stack.</p>
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| 414 | <dl class="docutils">
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| 415 | <dt>Additional features include:</dt>
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| 416 | <dd><ul class="first last simple">
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| 417 | <li>Automatic probing of audio backends ("--probe-backends")</li>
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| 418 | <li>Manual playback of test tones ("play -t")</li>
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| 419 | <li>Manual playback of .WAV files ("play <WAV-File>")</li>
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| 420 | <li>Manual recording to .WAV files ("recording <WAV-File>")</li>
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| 421 | <li>Manual device enumeration (sub command "enum")</li>
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| 422 | <li>Manual (re-)verification of test sets (sub command "verify")</li>
|
|---|
| 423 | <li>Self-contained self tests (sub command "selftest")</li>
|
|---|
| 424 | </ul>
|
|---|
| 425 | </dd>
|
|---|
| 426 | </dl>
|
|---|
| 427 | <p>See the syntax help ("--help") for more.</p>
|
|---|
| 428 | </li>
|
|---|
| 429 | <li><p class="first">ATS ("Audio Testing Service"): Component which is being used by 1 and the
|
|---|
| 430 | Validation Kit audio driver (backend) to communicate across guest and host
|
|---|
| 431 | boundaries. Currently using a TCP/IP transport layer. Also works with VMs
|
|---|
| 432 | which are configured with NAT networking ("reverse connection").</p>
|
|---|
| 433 | </li>
|
|---|
| 434 | <li><p class="first">Validation Kit audio test driver (tdAudioTest.py): Used for integrating and
|
|---|
| 435 | invoking VKAT for manual and automated tests via the Validation Kit framework
|
|---|
| 436 | (Test Manager). Optional. The test driver can be found at <a class="footnote-reference" href="#footnote-1" id="footnote-reference-1">[1]</a>.</p>
|
|---|
| 437 | </li>
|
|---|
| 438 | <li><p class="first">Validation Kit audio driver (backend): A dedicated audio backend which
|
|---|
| 439 | communicates with VKAT running on the same host to perform the actual audio
|
|---|
| 440 | tests on a VirtualBox installation. This makes it possible to test the full
|
|---|
| 441 | audio stack on a running VM without any additional / external tools.</p>
|
|---|
| 442 | <p>On guest playback, data will be recorded, on guest recording, data will be
|
|---|
| 443 | injected from the host into the audio stack.</p>
|
|---|
| 444 | </li>
|
|---|
| 445 | <li><dl class="first docutils">
|
|---|
| 446 | <dt>Test sets contain</dt>
|
|---|
| 447 | <dd><ul class="first last simple">
|
|---|
| 448 | <li>a test manifest with all information required (vkat_manifest.ini)</li>
|
|---|
| 449 | <li>the generated / captured audio data (as raw PCM)</li>
|
|---|
| 450 | </ul>
|
|---|
| 451 | </dd>
|
|---|
| 452 | </dl>
|
|---|
| 453 | <p>and are either packed as .tar.gz archives or consist of a dedicated directory
|
|---|
| 454 | per test set.</p>
|
|---|
| 455 | <p>There always must be at least two test sets - one from the host side and one
|
|---|
| 456 | from the guest side - to perform a verification.</p>
|
|---|
| 457 | <p>Each test set contains a test tag so that matching test sets can be
|
|---|
| 458 | identified.</p>
|
|---|
| 459 | </li>
|
|---|
| 460 | </ul>
|
|---|
| 461 | <p>The above components are also included in VirtualBox release builds and can be
|
|---|
| 462 | optionally enabled (disabled by default).</p>
|
|---|
| 463 | <table class="docutils footnote" frame="void" id="footnote-1" rules="none">
|
|---|
| 464 | <colgroup><col class="label" /><col /></colgroup>
|
|---|
| 465 | <tbody valign="top">
|
|---|
| 466 | <tr><td class="label"><a class="fn-backref" href="#footnote-reference-1">[1]</a></td><td>src/VBox/ValidationKit/tests/audio/tdAudioTest.py</td></tr>
|
|---|
| 467 | </tbody>
|
|---|
| 468 | </table>
|
|---|
| 469 | </div>
|
|---|
| 470 | <div class="section" id="setup-instructions">
|
|---|
| 471 | <h1>Setup instructions</h1>
|
|---|
| 472 | <ul>
|
|---|
| 473 | <li><p class="first">VM needs to be configured to have audio emulation and audio testing enabled
|
|---|
| 474 | (via extra-data, set "VBoxInternal2/Audio/Debug/Enabled" to "true").</p>
|
|---|
| 475 | </li>
|
|---|
| 476 | <li><p class="first">Audio input / output for the VM needs to be enabled (depending on the test).</p>
|
|---|
| 477 | </li>
|
|---|
| 478 | <li><p class="first">Start VBoxAudioTest on the guest, for example:</p>
|
|---|
| 479 | <p>VBoxAudioTest test --mode guest --tcp-connect-address 10.0.2.2</p>
|
|---|
| 480 | <dl class="docutils">
|
|---|
| 481 | <dt>Note: VBoxAudioTest is included with the Guest Additions starting at</dt>
|
|---|
| 482 | <dd><p class="first last">VirtualBox 7.0.</p>
|
|---|
| 483 | </dd>
|
|---|
| 484 | <dt>Note: Depending on the VM's networking configuration there might be further</dt>
|
|---|
| 485 | <dd><p class="first last">steps necessary in order to be able to reach the host from the guest.
|
|---|
| 486 | See the VirtualBox manual for more information.</p>
|
|---|
| 487 | </dd>
|
|---|
| 488 | </dl>
|
|---|
| 489 | </li>
|
|---|
| 490 | </ul>
|
|---|
| 491 | </div>
|
|---|
| 492 | <div class="section" id="performing-a-manual-test">
|
|---|
| 493 | <h1>Performing a manual test</h1>
|
|---|
| 494 | <ul>
|
|---|
| 495 | <li><p class="first">Follow "Setup instructions".</p>
|
|---|
| 496 | </li>
|
|---|
| 497 | <li><p class="first">Start VBoxAudioTest on the host with selected test(s), for example:</p>
|
|---|
| 498 | <p>VBoxAudioTest test --mode host</p>
|
|---|
| 499 | <blockquote>
|
|---|
| 500 | <dl class="docutils">
|
|---|
| 501 | <dt>Note: VBoxAudioTest is included with the VirtualBox 7.0 host installers and</dt>
|
|---|
| 502 | <dd><p class="first last">will be installed by default.</p>
|
|---|
| 503 | </dd>
|
|---|
| 504 | </dl>
|
|---|
| 505 | </blockquote>
|
|---|
| 506 | </li>
|
|---|
| 507 | <li><p class="first">By default the test verification will be done automatically after running the
|
|---|
| 508 | tests.</p>
|
|---|
| 509 | </li>
|
|---|
| 510 | </ul>
|
|---|
| 511 | </div>
|
|---|
| 512 | <div class="section" id="advanced-performing-manual-verification">
|
|---|
| 513 | <h1>Advanced: Performing manual verification</h1>
|
|---|
| 514 | <p>VBoxAudioTest can manually be used with the "verify" sub command in order to
|
|---|
| 515 | (re-)verify previously generated test sets. It then will return different exit
|
|---|
| 516 | codes based on the verification result.</p>
|
|---|
| 517 | </div>
|
|---|
| 518 | <div class="section" id="advanced-performing-an-automated-test">
|
|---|
| 519 | <h1>Advanced: Performing an automated test</h1>
|
|---|
| 520 | <ul class="simple">
|
|---|
| 521 | <li>TxS (Test E[x]ecution Service) has to be up and running (part of the
|
|---|
| 522 | Validation Kit) on the guest.</li>
|
|---|
| 523 | <li>Invoke the tdAudioTest.py test driver, either manually or fully automated
|
|---|
| 524 | via Test Manager.</li>
|
|---|
| 525 | </ul>
|
|---|
| 526 | </div>
|
|---|
| 527 | <div class="section" id="internals-workflow-for-a-single-test">
|
|---|
| 528 | <h1>Internals: Workflow for a single test</h1>
|
|---|
| 529 | <p>When a single test is being executed on a running VM, the following (simplified)
|
|---|
| 530 | workflow applies:</p>
|
|---|
| 531 | <ul class="simple">
|
|---|
| 532 | <li>VKAT on the host connects to VKAT running on the guest (via ATS, also can be a
|
|---|
| 533 | remote machine in theory).</li>
|
|---|
| 534 | <li>VKAT on the host connects to Validation Kit audio driver on the host
|
|---|
| 535 | (via ATS, also can be a remote machine in theory).</li>
|
|---|
| 536 | <li><dl class="first docutils">
|
|---|
| 537 | <dt>For example, when doing playback tests, VKAT on the host ...</dt>
|
|---|
| 538 | <dd><ul class="first last">
|
|---|
| 539 | <li><dl class="first docutils">
|
|---|
| 540 | <dt>... tells the Validation Kit audio driver to start recording</dt>
|
|---|
| 541 | <dd>guest playback.</dd>
|
|---|
| 542 | </dl>
|
|---|
| 543 | </li>
|
|---|
| 544 | <li>... tells the VKAT on the guest to start playing back audio data.</li>
|
|---|
| 545 | <li><dl class="first docutils">
|
|---|
| 546 | <dt>... gathers all test data (generated from/by the guest and recorded from</dt>
|
|---|
| 547 | <dd>the host) as separate test sets.</dd>
|
|---|
| 548 | </dl>
|
|---|
| 549 | </li>
|
|---|
| 550 | <li>... starts verification / analysis of the test sets.</li>
|
|---|
| 551 | </ul>
|
|---|
| 552 | </dd>
|
|---|
| 553 | </dl>
|
|---|
| 554 | </li>
|
|---|
| 555 | </ul>
|
|---|
| 556 | </div>
|
|---|
| 557 | <div class="section" id="current-status-limitations">
|
|---|
| 558 | <h1>Current status / limitations</h1>
|
|---|
| 559 | <ul class="simple">
|
|---|
| 560 | <li><dl class="first docutils">
|
|---|
| 561 | <dt>The following test types are currently implemented:</dt>
|
|---|
| 562 | <dd><ul class="first last">
|
|---|
| 563 | <li>Test tone (sine wave) playback from the guest</li>
|
|---|
| 564 | <li>Test tone (sine wave) recording by the guest (injected from the host)</li>
|
|---|
| 565 | </ul>
|
|---|
| 566 | </dd>
|
|---|
| 567 | </dl>
|
|---|
| 568 | </li>
|
|---|
| 569 | <li>Only the HDA device emulation has been verified so far.</li>
|
|---|
| 570 | <li>Only the ALSA audio stack on Debian 10 has been verified so far.
|
|---|
| 571 | Note: This is different from PulseAudio using the ALSA plugin!</li>
|
|---|
| 572 | </ul>
|
|---|
| 573 | </div>
|
|---|
| 574 | <div class="section" id="troubleshooting">
|
|---|
| 575 | <h1>Troubleshooting</h1>
|
|---|
| 576 | <ul class="simple">
|
|---|
| 577 | <li>Make sure that audio device emulation is enabled and can be used within the
|
|---|
| 578 | guest. Also, audio input / output has to be enabled, depending on the tests.</li>
|
|---|
| 579 | <li>Make sure that the guest's VBoxAudioTest's instance can reach the host via
|
|---|
| 580 | the selected transport layer (TCP/IP by default).</li>
|
|---|
| 581 | <li>Increase the hosts audio logging level
|
|---|
| 582 | (via extra-data, set "VBoxInternal2/Audio/Debug/Level" to "5").</li>
|
|---|
| 583 | <li>Increase VBoxAudioTest's verbosity level (add "-v", can be specified
|
|---|
| 584 | multiple times).</li>
|
|---|
| 585 | <li>Check if the VBox release log contains any warnings / errors with the
|
|---|
| 586 | "ValKit:" prefix.</li>
|
|---|
| 587 | </ul>
|
|---|
| 588 | <table class="docutils field-list" frame="void" rules="none">
|
|---|
| 589 | <col class="field-name" />
|
|---|
| 590 | <col class="field-body" />
|
|---|
| 591 | <tbody valign="top">
|
|---|
| 592 | <tr class="field"><th class="field-name">Status:</th><td class="field-body">$Id: VBoxAudioValidationKitReadMe.html 98107 2023-01-17 22:56:50Z vboxsync $</td>
|
|---|
| 593 | </tr>
|
|---|
| 594 | <tr class="field"><th class="field-name">Copyright:</th><td class="field-body">Copyright (C) 2021-2023 Oracle Corporation.</td>
|
|---|
| 595 | </tr>
|
|---|
| 596 | </tbody>
|
|---|
| 597 | </table>
|
|---|
| 598 | </div>
|
|---|
| 599 | </div>
|
|---|
| 600 | </body>
|
|---|
| 601 | </html>
|
|---|
