fix(DASH): Fix dynamic manifests from edgeware (#4914)

Fixes #4913 --------- Co-authored-by: Joey Parrish <[email protected]> Co-authored-by: Joey Parrish <[email protected]>
shaka-project · Jan 30, 2023 · 247229b · 247229b
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diff --git a/lib/dash/segment_template.js b/lib/dash/segment_template.js
@@ -102,11 +102,23 @@ shaka.dash.SegmentTemplate = class {
       const periodEnd = context.periodInfo.duration ?
           context.periodInfo.start + context.periodInfo.duration : Infinity;
 
-      // Don't fit live content, since it might receive more segments.
-      // Unless that live content is multi-period; it's safe to fit every period
-      // but the last one, since only the last period might receive new
-      // segments.
-      const shouldFit = periodEnd != Infinity;
+      /* When to fit segments.  All refactors should honor/update this table:
+       *
+       * | dynamic | infinite | last   | should | notes                     |
+       * |         | period   | period | fit    |                           |
+       * | ------- | -------- | ------ | ------ | ------------------------- |
+       * |     F   |     F    |    X   |    T   | typical VOD               |
+       * |     F   |     T    |    X   |    X   | impossible: infinite VOD  |
+       * |     T   |     F    |    F   |    T   | typical live, old period  |
+       * |     T   |     F    |    T   |    F   | typical IPR               |
+       * |     T   |     T    |    F   |    X   | impossible: old, infinite |
+       * |     T   |     T    |    T   |    F   | typical live, new period  |
+       */
+
+      // We never fit the final period of dynamic content, which could be
+      // infinite live (with no limit to fit to) or IPR (which would expand the
+      // most recent segment to the end of the presentation).
+      const shouldFit = !(context.dynamic && context.periodInfo.isLastPeriod);
 
       if (segmentIndex) {
         if (shouldFit) {

diff --git a/test/dash/dash_parser_manifest_unit.js b/test/dash/dash_parser_manifest_unit.js
@@ -195,42 +195,6 @@ describe('DashParser Manifest', () => {
         }));
   });
 
-  it('rejects periods after one without duration', async () => {
-    const periodContents = [
-      '    <AdaptationSet mimeType="video/mp4" lang="en" group="1">',
-      '      <Representation bandwidth="100">',
-      '        <SegmentTemplate startNumber="1" media="l-$Number$.mp4">',
-      '          <SegmentTimeline>',
-      '            <S t="0" d="10" />',
-      '          </SegmentTimeline>',
-      '        </SegmentTemplate>',
-      '      </Representation>',
-      '    </AdaptationSet>',
-    ].join('\n');
-    const template = [
-      '<MPD mediaPresentationDuration="PT75S">',
-      '  <Period id="1">',
-      '%(periodContents)s',
-      '  </Period>',
-      '  <Period id="2">',
-      '%(periodContents)s',
-      '  </Period>',
-      '</MPD>',
-    ].join('\n');
-    const source = sprintf(template, {periodContents: periodContents});
-
-    fakeNetEngine.setResponseText('dummy://foo', source);
-    /** @type {shaka.extern.Manifest} */
-    const manifest = await parser.start('dummy://foo', playerInterface);
-    const video = manifest.variants[0].video;
-    await video.createSegmentIndex();
-
-    // The first period has a segment from 0-10.
-    // With the second period skipping, we should fail to find a segment at 10.
-    expect(video.segmentIndex.find(0)).not.toBe(null);
-    expect(video.segmentIndex.find(10)).toBe(null);
-  });
-
   it('calculates Period times when missing', async () => {
     const periodContents = [
       '    <AdaptationSet mimeType="video/mp4" lang="en" group="1">',