From f938c42021364e9ffbcd40f502d5f762c4a48ca6 Mon Sep 17 00:00:00 2001
From: Bryce Seager van Dyk <bvandyk@mozilla.com>
Date: Thu, 24 Feb 2022 02:04:46 +0000
Subject: [PATCH] Bug 1755822 - Add test to ensure MediaTrackBuffersManager is
 clearing its input buffer. r=media-playback-reviewers,alwu

This adds a modified version of the bipbop video 1 segment used in the
MediaSource tests. This modified segment contains a large trailing 'skip' box.
These trailing boxes can interfere with Gecko's ability to clear memory.

A test case is added to test that Fx is correctly clearing memory after the new
segment is appended several times. Prior to the fix in bug 1697476 this test
would fail, but we should now handle this case better.

Differential Revision: https://phabricator.services.mozilla.com/D139265
---
 .../bipbop_trailing_skip_box_video1.m4s       | Bin 0 -> 1023860 bytes
 ...pbop_trailing_skip_box_video1.m4s^headers^ |   1 +
 dom/media/mediasource/test/mochitest.ini      |   3 +
 .../test/test_InputBufferIsCleared.html       |  58 ++++++++++++++++++
 4 files changed, 62 insertions(+)
 create mode 100644 dom/media/mediasource/test/bipbop/bipbop_trailing_skip_box_video1.m4s
 create mode 100644 dom/media/mediasource/test/bipbop/bipbop_trailing_skip_box_video1.m4s^headers^
 create mode 100644 dom/media/mediasource/test/test_InputBufferIsCleared.html

diff --git a/dom/media/mediasource/test/bipbop/bipbop_trailing_skip_box_video1.m4s b/dom/media/mediasource/test/bipbop/bipbop_trailing_skip_box_video1.m4s
new file mode 100644
index 0000000000000000000000000000000000000000..fa5d454277097f49f941f9ddd7eafe80c1db1aa6
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/dom/media/mediasource/test/bipbop/bipbop_trailing_skip_box_video1.m4s^headers^ b/dom/media/mediasource/test/bipbop/bipbop_trailing_skip_box_video1.m4s^headers^
new file mode 100644
index 000000000000..4030ea1d3ddb
--- /dev/null
+++ b/dom/media/mediasource/test/bipbop/bipbop_trailing_skip_box_video1.m4s^headers^
@@ -0,0 +1 @@
+Cache-Control: no-store
diff --git a/dom/media/mediasource/test/mochitest.ini b/dom/media/mediasource/test/mochitest.ini
index 7549c3c7d971..0fbbebe081f9 100644
--- a/dom/media/mediasource/test/mochitest.ini
+++ b/dom/media/mediasource/test/mochitest.ini
@@ -6,6 +6,8 @@ support-files =
   seek_lowres.webm seek_lowres.webm^headers^
   bipbop/bipbop_300-3s.webm bipbop/bipbop_300-3s.webm^headers^
   bipbop/bipbop2s.mp4 bipbop/bipbop2s.mp4^headers^
+  bipbop/bipbop_trailing_skip_box_video1.m4s
+  bipbop/bipbop_trailing_skip_box_video1.m4s^headers^
   bipbop/bipbopinit.mp4 bipbop/bipbop_audioinit.mp4 bipbop/bipbop_videoinit.mp4
   bipbop/bipbop1.m4s bipbop/bipbop_audio1.m4s bipbop/bipbop_video1.m4s
   bipbop/bipbop2.m4s bipbop/bipbop_audio2.m4s bipbop/bipbop_video2.m4s
@@ -87,6 +89,7 @@ skip-if = os == 'win' # bug 1487973,
 [test_HaveMetadataUnbufferedSeek.html]
 [test_HaveMetadataUnbufferedSeek_mp4.html]
 [test_HEAAC_extradata.html]
+[test_InputBufferIsCleared.html]
 [test_LiveSeekable.html]
 [test_LoadedDataFired_mp4.html]
 [test_LoadedMetadataFired.html]
diff --git a/dom/media/mediasource/test/test_InputBufferIsCleared.html b/dom/media/mediasource/test/test_InputBufferIsCleared.html
new file mode 100644
index 000000000000..bad9a0c558c3
--- /dev/null
+++ b/dom/media/mediasource/test/test_InputBufferIsCleared.html
@@ -0,0 +1,58 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: input buffer is cleared as expected (bug 1697476)</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+// Test bug 1697476 is fixed. We do this by appending a number of segments with
+// trailing `skip` boxes. If the bug is fixed, then the data from these appends
+// will eventually be cleared from memory. If not fixed, we leak that memory.
+runWithMSE(async (ms, v) => {
+  await once(ms, "sourceopen");
+  const sb = ms.addSourceBuffer("video/mp4");
+  await fetchAndLoad(sb, "bipbop/bipbop_video", ["init"], ".mp4");
+  // Load ~1mb of media.
+  await fetchAndLoad(sb, "bipbop/bipbop_trailing_skip_box_video", ["1"], ".m4s");
+  // Load ~1mb more media several more times.
+  const numberOfAppends = 5;
+  for (let i = 1; i < numberOfAppends; ++i) {
+    sb.timestampOffset = v.buffered.end(0);
+    await fetchAndLoad(sb, "bipbop/bipbop_trailing_skip_box_video", ["1"], ".m4s");
+  }
+
+  // Grab a memory report. We'll use this to make sure we're not accumulating
+  // too much data in our buffers.
+  const mgr = SpecialPowers.Cc["@mozilla.org/memory-reporter-manager;1"]
+      .getService(SpecialPowers.Ci.nsIMemoryReporterManager);
+
+  let amount = 0;
+  const handleReport = (aProcess, aPath, aKind, aUnits, aAmount) => {
+    if (aPath == "explicit/media/resources") {
+      amount += aAmount;
+    }
+  };
+
+  await new Promise(r => mgr.getReports(handleReport, null, r, null, /* anonymized = */ false));
+  ok(true, "Yay didn't crash!");
+  ok(amount !== undefined, "Got media resources amount");
+  const sgementSize = 1023860;
+  // Set the limit to be equal to the total data we appended. If we're not
+  // clearing buffers, we'll have all the data from the appends + some other
+  // data, so will fail.
+  const limit = sgementSize * numberOfAppends - 1;
+  ok(amount < limit, `Should have less than ${limit} bytes of media usage. Got ${amount} bytes.`);
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>