[webkit-changes] [236695] releases/WebKitGTK/webkit-2.22

Mon, 01 Oct 2018 16:14:19 -0700

Title: [236695] releases/WebKitGTK/webkit-2.22
Revision
236695
Author
ape...@igalia.com
Date
2018-10-01 16:12:44 -0700 (Mon, 01 Oct 2018)

Log Message

Merged patch for #190085 - [MSE] Use tolerance when growing the coded frame group
https://bugs.webkit.org/show_bug.cgi?id=190085

Patch by Alicia Boya García <ab...@igalia.com> on 2018-10-01
Reviewed by NOBODY (OOPS!).

build-releng/../LayoutTests:

A test simulating unordered appends with imprecise timestamps,
overlapping <1ms (replicating a typical WebM 30fps video file) is
added.

* media/media-source/media-source-append-acb-tolerance.html: Added.

build-releng/../Source/WebCore:

Test: media/media-source/media-source-append-acb-tolerance.html

This patch introduces a millisecond tolerance in the range of
potential frames that should be erased frame from the track buffer
when the coded frame group is growing.

This is necessary because some files have imprecise overlapping
timestamps (especially WebM files).

This fixes a stall when seeking back and forth in YouTube with WebM
video.

A test case simulating the problem with video/mock using timestamps
similar to those of a typical 30 fps WebM video is also added.

* Modules/mediasource/SourceBuffer.cpp:
(WebCore::SourceBuffer::sourceBufferPrivateDidReceiveSample):

Modified Paths

Added Paths

Diff

Modified: releases/WebKitGTK/webkit-2.22/LayoutTests/ChangeLog (236694 => 236695)


--- releases/WebKitGTK/webkit-2.22/LayoutTests/ChangeLog	2018-10-01 22:43:05 UTC (rev 236694)
+++ releases/WebKitGTK/webkit-2.22/LayoutTests/ChangeLog	2018-10-01 23:12:44 UTC (rev 236695)
@@ -1,3 +1,14 @@
+2018-10-01  Alicia Boya García  <ab...@igalia.com>
+
+        [MSE] Use tolerance when growing the coded frame group
+        https://bugs.webkit.org/show_bug.cgi?id=190085
+
+        A test simulating unordered appends with imprecise timestamps,
+        overlapping <1ms (replicating a typical WebM 30fps video file) is
+        added.
+
+        * media/media-source/media-source-append-acb-tolerance.html: Added.
+
 2018-09-27  Alicia Boya García  <ab...@igalia.com>
 
         [MSE] Fix unwanted sample erase from the decode queue

Added: releases/WebKitGTK/webkit-2.22/LayoutTests/media/media-source/media-source-append-acb-tolerance-expected.txt (0 => 236695)


--- releases/WebKitGTK/webkit-2.22/LayoutTests/media/media-source/media-source-append-acb-tolerance-expected.txt	                        (rev 0)
+++ releases/WebKitGTK/webkit-2.22/LayoutTests/media/media-source/media-source-append-acb-tolerance-expected.txt	2018-10-01 23:12:44 UTC (rev 236695)
@@ -0,0 +1,466 @@
+
+EXPECTED (source.readyState == 'closed') OK
+EVENT(sourceopen)
+RUN(sourceBuffer = source.addSourceBuffer("video/mock; codecs=mock"))
+RUN(sourceBuffer.appendBuffer(initSegment))
+EVENT(updateend)
+RUN(sourceBuffer.appendBuffer(impreciseSampleRun(0, 5)))
+EVENT(updateend)
+RUN(sourceBuffer.appendBuffer(impreciseSampleRun(10, 15)))
+EVENT(updateend)
+RUN(sourceBuffer.appendBuffer(impreciseSampleRun(5, 10)))
+EVENT(updateend)
+EXPECTED (bufferedSamples.length == '450') OK
+EXPECTED (enqueuedSamples.length == '450') OK
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+{PTS({14100000/1000000 = 14.100000}), DTS({14100000/1000000 = 14.100000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14133000/1000000 = 14.133000}), DTS({14133000/1000000 = 14.133000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14167000/1000000 = 14.167000}), DTS({14167000/1000000 = 14.167000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14200000/1000000 = 14.200000}), DTS({14200000/1000000 = 14.200000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14233000/1000000 = 14.233000}), DTS({14233000/1000000 = 14.233000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14267000/1000000 = 14.267000}), DTS({14267000/1000000 = 14.267000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14300000/1000000 = 14.300000}), DTS({14300000/1000000 = 14.300000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14333000/1000000 = 14.333000}), DTS({14333000/1000000 = 14.333000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14367000/1000000 = 14.367000}), DTS({14367000/1000000 = 14.367000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14400000/1000000 = 14.400000}), DTS({14400000/1000000 = 14.400000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14433000/1000000 = 14.433000}), DTS({14433000/1000000 = 14.433000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14467000/1000000 = 14.467000}), DTS({14467000/1000000 = 14.467000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14500000/1000000 = 14.500000}), DTS({14500000/1000000 = 14.500000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14533000/1000000 = 14.533000}), DTS({14533000/1000000 = 14.533000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14567000/1000000 = 14.567000}), DTS({14567000/1000000 = 14.567000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14600000/1000000 = 14.600000}), DTS({14600000/1000000 = 14.600000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14633000/1000000 = 14.633000}), DTS({14633000/1000000 = 14.633000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14667000/1000000 = 14.667000}), DTS({14667000/1000000 = 14.667000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14700000/1000000 = 14.700000}), DTS({14700000/1000000 = 14.700000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14733000/1000000 = 14.733000}), DTS({14733000/1000000 = 14.733000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14767000/1000000 = 14.767000}), DTS({14767000/1000000 = 14.767000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14800000/1000000 = 14.800000}), DTS({14800000/1000000 = 14.800000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14833000/1000000 = 14.833000}), DTS({14833000/1000000 = 14.833000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14867000/1000000 = 14.867000}), DTS({14867000/1000000 = 14.867000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14900000/1000000 = 14.900000}), DTS({14900000/1000000 = 14.900000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14933000/1000000 = 14.933000}), DTS({14933000/1000000 = 14.933000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+{PTS({14967000/1000000 = 14.967000}), DTS({14967000/1000000 = 14.967000}), duration({33333/1000000 = 0.033333}), flags(0), generation(0)}
+END OF TEST
+

Added: releases/WebKitGTK/webkit-2.22/LayoutTests/media/media-source/media-source-append-acb-tolerance.html (0 => 236695)


--- releases/WebKitGTK/webkit-2.22/LayoutTests/media/media-source/media-source-append-acb-tolerance.html	                        (rev 0)
+++ releases/WebKitGTK/webkit-2.22/LayoutTests/media/media-source/media-source-append-acb-tolerance.html	2018-10-01 23:12:44 UTC (rev 236695)
@@ -0,0 +1,106 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>media-source-append-acb-tolerance</title>
+    <script src=""
+    <script src=""
+    <script>
+    var source;
+    var sourceBuffer;
+    var initSegment;
+    var bufferedSamples;
+    var enqueuedSamples;
+
+    if (window.internals)
+        internals.initializeMockMediaSource();
+
+    function makeAWebMLikeSample(presentationTimeMilliseconds, durationMicroseconds, trackID, flags, generation) {
+        // The original makeASample() function uses millisecond precision for all the fields, but for this test we need
+        // to test what happens with overlaps smaller than that.
+
+        var byteLength = 30;
+        var buffer = new ArrayBuffer(byteLength);
+        var array = new Uint8Array(buffer);
+        array.set(stringToArray('smpl'));
+
+        var view = new DataView(buffer);
+        view.setUint32(4, byteLength, true);
+
+        var timeScale = 1e6;
+        view.setInt32(8, timeScale, true);
+        view.setInt32(12, presentationTimeMilliseconds * 1000, true);
+        view.setInt32(16, presentationTimeMilliseconds * 1000, true);
+        view.setInt32(20, durationMicroseconds, true);
+        view.setInt32(24, trackID, true);
+        view.setUint8(28, flags);
+        view.setUint8(29, generation);
+
+        return buffer
+    }
+
+    function impreciseSampleRun(start, end) {
+        // A common case for WebM files is for duration to have greater precision than timestamps.
+        // This is because DefaultDuration is always set in nanoseconds (per spec), while other timestamps are set in
+        // Timescale (usually milliseconds).
+        // These settings try to replicate the timing found in a typical WebM 30 fps video.
+        // Duration here is set to microseconds instead of nanoseconds because otherwise MockSampleBox would overflow
+        // after just 2.133 seconds.
+        const samples = [];
+        const fps = 30;
+        const numFrames = (end - start) * fps;
+        for (let numFrame = 0; numFrame < numFrames; numFrame++) {
+            const ptsMilliseconds = Math.round(1000 * (start + numFrame / fps));
+            const durationMicroseconds = 33333;
+            samples.push(makeAWebMLikeSample(ptsMilliseconds, durationMicroseconds, 1, numFrame === 0 ? SAMPLE_FLAG.SYNC : SAMPLE_FLAG.NONE));
+        }
+        return concatenateSamples(samples);
+    }
+
+    window.addEventListener('load', async () => {
+        findMediaElement();
+        source = new MediaSource();
+        testExpected('source.readyState', 'closed');
+        const sourceOpened = waitFor(source, 'sourceopen');
+
+        const videoSource = document.createElement('source');
+        videoSource.type = 'video/mock; codecs=mock';
+        videoSource.src = ""
+        video.appendChild(videoSource);
+
+        await sourceOpened;
+        run('sourceBuffer = source.addSourceBuffer("video/mock; codecs=mock")');
+
+        initSegment = makeAInit(15, [makeATrack(1, 'mock', TRACK_KIND.VIDEO)]);
+
+        run('sourceBuffer.appendBuffer(initSegment)');
+        await waitFor(sourceBuffer, 'updateend');
+
+        // Segment A
+        run('sourceBuffer.appendBuffer(impreciseSampleRun(0, 5))');
+        await waitFor(sourceBuffer, 'updateend');
+
+        // Segment C
+        run('sourceBuffer.appendBuffer(impreciseSampleRun(10, 15))');
+        await waitFor(sourceBuffer, 'updateend');
+
+        // Segment B
+        run('sourceBuffer.appendBuffer(impreciseSampleRun(5, 10))');
+        await waitFor(sourceBuffer, 'updateend');
+
+        bufferedSamples = internals.bufferedSamplesForTrackID(sourceBuffer, 1);
+        enqueuedSamples = internals.enqueuedSamplesForTrackID(sourceBuffer, 1);
+
+        // 30 samples were appended in total. All of them should have ended up in buffered samples and in the decode queue.
+        testExpected('bufferedSamples.length', 15 * 30);
+        testExpected('enqueuedSamples.length', 15 * 30);
+
+        enqueuedSamples.forEach(consoleWrite);
+
+        endTest();
+    });
+    </script>
+</head>
+<body>
+    <video controls></video>
+</body>
+</html>
\ No newline at end of file

Modified: releases/WebKitGTK/webkit-2.22/Source/WebCore/ChangeLog (236694 => 236695)


--- releases/WebKitGTK/webkit-2.22/Source/WebCore/ChangeLog	2018-10-01 22:43:05 UTC (rev 236694)
+++ releases/WebKitGTK/webkit-2.22/Source/WebCore/ChangeLog	2018-10-01 23:12:44 UTC (rev 236695)
@@ -1,5 +1,28 @@
 2018-10-01  Alicia Boya García  <ab...@igalia.com>
 
+        [MSE] Use tolerance when growing the coded frame group
+        https://bugs.webkit.org/show_bug.cgi?id=190085
+
+        Test: media/media-source/media-source-append-acb-tolerance.html
+
+        This patch introduces a millisecond tolerance in the range of
+        potential frames that should be erased frame from the track buffer
+        when the coded frame group is growing.
+
+        This is necessary because some files have imprecise overlapping
+        timestamps (especially WebM files).
+
+        This fixes a stall when seeking back and forth in YouTube with WebM
+        video.
+
+        A test case simulating the problem with video/mock using timestamps
+        similar to those of a typical 30 fps WebM video is also added.
+
+        * Modules/mediasource/SourceBuffer.cpp:
+        (WebCore::SourceBuffer::sourceBufferPrivateDidReceiveSample):
+
+2018-10-01  Alicia Boya García  <ab...@igalia.com>
+
         [MSE][GStreamer] Set a minimum sample duration
         https://bugs.webkit.org/show_bug.cgi?id=190125

Modified: releases/WebKitGTK/webkit-2.22/Source/WebCore/Modules/mediasource/SourceBuffer.cpp (236694 => 236695)


--- releases/WebKitGTK/webkit-2.22/Source/WebCore/Modules/mediasource/SourceBuffer.cpp	2018-10-01 22:43:05 UTC (rev 236694)
+++ releases/WebKitGTK/webkit-2.22/Source/WebCore/Modules/mediasource/SourceBuffer.cpp	2018-10-01 23:12:44 UTC (rev 236695)
@@ -1543,6 +1543,14 @@
                 erasedSamples.addRange(iter_pair.first, iter_pair.second);
         }
 
+        // There are many files out there where the frame times are not perfectly contiguous and may have small overlaps
+        // between the beginning of a frame and the end of the previous one; therefore a tolerance is needed whenever
+        // durations are considered.
+        // For instance, most WebM files are muxed rounded to the millisecond (the default TimecodeScale of the format)
+        // but their durations use a finer timescale (causing a sub-millisecond overlap). More rarely, there are also
+        // MP4 files with slightly off tfdt boxes, presenting a similar problem at the beginning of each fragment.
+        const MediaTime contiguousFrameTolerance = MediaTime(1, 1000);
+
         // If highest presentation timestamp for track buffer is set and less than or equal to presentation timestamp
         if (trackBuffer.highestPresentationTimestamp.isValid() && trackBuffer.highestPresentationTimestamp <= presentationTimestamp) {
             // Remove all coded frames from track buffer that have a presentation timestamp greater than highest
@@ -1556,14 +1564,16 @@
                     break;
 
                 MediaTime highestBufferedTime = trackBuffer.buffered.maximumBufferedTime();
+                MediaTime eraseBeginTime = trackBuffer.highestPresentationTimestamp;
+                MediaTime eraseEndTime = frameEndTimestamp - contiguousFrameTolerance;
 
                 PresentationOrderSampleMap::iterator_range range;
                 if (highestBufferedTime - trackBuffer.highestPresentationTimestamp < trackBuffer.lastFrameDuration)
                     // If the new frame is at the end of the buffered ranges, perform a sequential scan from end (O(1)).
-                    range = trackBuffer.samples.presentationOrder().findSamplesBetweenPresentationTimesFromEnd(trackBuffer.highestPresentationTimestamp, frameEndTimestamp);
+                    range = trackBuffer.samples.presentationOrder().findSamplesBetweenPresentationTimesFromEnd(eraseBeginTime, eraseEndTime);
                 else
                     // In any other case, perform a binary search (O(log(n)).
-                    range = trackBuffer.samples.presentationOrder().findSamplesBetweenPresentationTimes(trackBuffer.highestPresentationTimestamp, frameEndTimestamp);
+                    range = trackBuffer.samples.presentationOrder().findSamplesBetweenPresentationTimes(eraseBeginTime, eraseEndTime);
 
                 if (range.first != trackBuffer.samples.presentationOrder().end())
                     erasedSamples.addRange(range.first, range.second);
@@ -1616,10 +1626,6 @@
         //
         // In order to check whether a frame should be added to the decode queue we check whether it starts after the
         // lastEnqueuedDecodeEndTime or even a bit before that to accomodate files with imprecise timing information.
-        //
-        // There are many files out there where the frame times are not perfectly contiguous, therefore a tolerance is needed.
-        // For instance, most WebM files are muxed rounded to the millisecond (the default TimecodeScale of the format).
-        const MediaTime contiguousFrameTolerance = MediaTime(1, 1000);
         if (trackBuffer.lastEnqueuedDecodeEndTime.isInvalid() || decodeTimestamp >= (trackBuffer.lastEnqueuedDecodeEndTime - contiguousFrameTolerance)) {
             DecodeOrderSampleMap::KeyType decodeKey(sample.decodeTime(), sample.presentationTime());
             trackBuffer.decodeQueue.insert(DecodeOrderSampleMap::MapType::value_type(decodeKey, &sample));

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