missing-sinf.html - mozsearch

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<!doctype html>

<html>

  <head>

    <meta charset=utf-8>

    <title>Missing scheme information box in protected sample entry</title>

    <link rel="help" href="https://w3c.github.io/encrypted-media/">

    <!-- Web Platform Test Harness scripts -->

    <script src=/resources/testharness.js></script>

    <script src=/resources/testharnessreport.js></script>

    <!-- Content metadata -->

    <script src=/encrypted-media/content/content-metadata.js></script>

  </head>

  <body>

    <div id='log'></div>

    <div id='audio'>

      <audio id="audioelement" width="200px"></video>

    </div>

  </body>

  <script>

const contentItem = content['mp4-av-multikey'];

const audio = document.getElementById('audioelement');

// Test that a non conforming mp4 protected sample entry triggers the append

// error algorithm.

// https://w3c.github.io/media-source/#sourcebuffer-segment-parser-loop

// 2. If the [[input buffer]] contains bytes that violate the SourceBuffer

//    byte stream format specification, then run the append error algorithm and

//    abort this algorithm.

promise_test(async t => {

  audio.watcher = new EventWatcher(t, audio, ['error']);

  const response = await fetch(contentItem.audio.path);

  assert_true(response.ok, 'response.ok');

  const audioMedia = new Uint8Array(await response.arrayBuffer());

  const source = new MediaSource();

  source.watcher = new EventWatcher(t, source, ['sourceopen']);

  audio.src = URL.createObjectURL(source);

  await source.watcher.wait_for('sourceopen');

  const mediaType = contentItem.audio.type;

  assert_implements_optional(MediaSource.isTypeSupported(mediaType),

                             `${mediaType} supported`);

  const buffer = source.addSourceBuffer(mediaType);

  buffer.watcher = new EventWatcher(t, buffer, ['error', 'updateend']);

  // ISO/IEC 14496-12:2015(E)

  // 8.12.1 Protection Scheme Information Box

  // 8.12.1.1 Definition

  // "At least one protection scheme information box must occur in a protected

  //  sample entry."

//

  // Change the 'sinf' box type to 'sin ' so that there is no protection

  // scheme information box in the protected sample entry.

  // 4-byte offset for the `type` field after `size` and 3 bytes to index the

  // last character of the type.

  audioMedia[contentItem.audio.sinfStart + 4 + 3] = ' '.charCodeAt();

  buffer.appendBuffer(audioMedia);

  await Promise.all([

    buffer.watcher.wait_for(['error', 'updateend']),

    audio.watcher.wait_for('error'),

]);

}, 'missing-sinf');

  </script>

</html>