1 files changed, 59 insertions, 0 deletions
diff --git a/dom/media/mediacontrol/tests/browser/browser_seek_captured_audio.js b/dom/media/mediacontrol/tests/browser/browser_seek_captured_audio.js
new file mode 100644
index 0000000000..3dbbee065e
--- /dev/null
+++ b/dom/media/mediacontrol/tests/browser/browser_seek_captured_audio.js
@@ -0,0 +1,59 @@
+const PAGE_NON_AUTOPLAY_MEDIA =
+  "https://example.com/browser/dom/media/mediacontrol/tests/browser/file_non_autoplay.html";
+
+const testVideoId = "video";
+
+add_task(async function setupTestingPref() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["media.mediacontrol.testingevents.enabled", true]],
+  });
+});
+
+/**
+ * Seeking a captured audio media before it starts, and it should still be able
+ * to be controlled via media key after it starts playing.
+ */
+add_task(async function testSeekAudibleCapturedMedia() {
+  info(`open new non autoplay media page`);
+  const tab = await createLoadedTabWrapper(PAGE_NON_AUTOPLAY_MEDIA);
+
+  info(`perform seek on the captured media before it starts`);
+  await captureAudio(tab, testVideoId);
+  await seekAudio(tab, testVideoId);
+
+  info(`start captured media`);
+  await playMedia(tab, testVideoId);
+
+  info(`pressing 'pause' key, captured media should be paused`);
+  await generateMediaControlKeyEvent("pause");
+  await checkOrWaitUntilMediaStoppedPlaying(tab, testVideoId);
+
+  info(`remove tab`);
+  await tab.close();
+});
+
+/**
+ * The following are helper functions.
+ */
+function captureAudio(tab, elementId) {
+  return SpecialPowers.spawn(tab.linkedBrowser, [elementId], Id => {
+    const video = content.document.getElementById(Id);
+    if (!video) {
+      ok(false, `can't get the media element!`);
+    }
+    const context = new content.AudioContext();
+    // Capture audio from the media element to a MediaElementAudioSourceNode.
+    context.createMediaElementSource(video);
+  });
+}
+
+function seekAudio(tab, elementId) {
+  return SpecialPowers.spawn(tab.linkedBrowser, [elementId], async Id => {
+    const video = content.document.getElementById(Id);
+    if (!video) {
+      ok(false, `can't get the media element!`);
+    }
+    video.currentTime = 0.0;
+    await new Promise(r => (video.onseeked = r));
+  });
+}