Fix timestamp comparison for seeks in fMP4

When seeking in fMP4, we try to extract as little samples as possible
by only starting at the preceding sync frame. This comparison should
use <= to allow sync frames at exactly the seek position.

Issue: #10941

#minor-release

PiperOrigin-RevId: 505098172
(cherry picked from commit ac3017b)

Author: tonihei

library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/FragmentedMp4Extractor.java

@@ -1673,15 +1673,15 @@ public void resetFragmentInfo() {
     }
 
     /**
-     * Advances {@link #firstSampleToOutputIndex} to point to the sync sample before the specified
-     * seek time in the current fragment.
+     * Advances {@link #firstSampleToOutputIndex} to point to the sync sample at or before the
+     * specified seek time in the current fragment.
      *
      * @param timeUs The seek time, in microseconds.
      */
     public void seek(long timeUs) {
       int searchIndex = currentSampleIndex;
       while (searchIndex < fragment.sampleCount
-          && fragment.getSamplePresentationTimeUs(searchIndex) < timeUs) {
+          && fragment.getSamplePresentationTimeUs(searchIndex) <= timeUs) {
         if (fragment.sampleIsSyncFrameTable[searchIndex]) {
           firstSampleToOutputIndex = searchIndex;
         }

testdata/src/test/assets/extractordumps/mp4/sample_ac3_fragmented.mp4.1.dump

@@ -7,8 +7,8 @@ seekMap:
   getPosition(288000) = [[timeUs=0, position=636]]
 numberOfTracks = 1
 track 0:
-  total output bytes = 10752
-  sample count = 7
+  total output bytes = 9216
+  sample count = 6
   format 0:
     averageBitrate = 384000
     peakBitrate = 384000
@@ -18,30 +18,26 @@ track 0:
     sampleRate = 48000
     language = und
   sample 0:
-    time = 64000
-    flags = 1
-    data = length 1536, hash 5D09685
-  sample 1:
     time = 96000
     flags = 1
     data = length 1536, hash A9A24E44
-  sample 2:
+  sample 1:
     time = 128000
     flags = 1
     data = length 1536, hash 6F856273
-  sample 3:
+  sample 2:
     time = 160000
     flags = 1
     data = length 1536, hash B1737D3C
-  sample 4:
+  sample 3:
     time = 192000
     flags = 1
     data = length 1536, hash 98FDEB9D
-  sample 5:
+  sample 4:
     time = 224000
     flags = 1
     data = length 1536, hash 99B9B943
-  sample 6:
+  sample 5:
     time = 256000
     flags = 1
     data = length 1536, hash AAD9FCD2

testdata/src/test/assets/extractordumps/mp4/sample_ac3_fragmented.mp4.2.dump

@@ -7,8 +7,8 @@ seekMap:
   getPosition(288000) = [[timeUs=0, position=636]]
 numberOfTracks = 1
 track 0:
-  total output bytes = 6144
-  sample count = 4
+  total output bytes = 4608
+  sample count = 3
   format 0:
     averageBitrate = 384000
     peakBitrate = 384000
@@ -18,18 +18,14 @@ track 0:
     sampleRate = 48000
     language = und
   sample 0:
-    time = 160000
-    flags = 1
-    data = length 1536, hash B1737D3C
-  sample 1:
     time = 192000
     flags = 1
     data = length 1536, hash 98FDEB9D
-  sample 2:
+  sample 1:
     time = 224000
     flags = 1
     data = length 1536, hash 99B9B943
-  sample 3:
+  sample 2:
     time = 256000
     flags = 1
     data = length 1536, hash AAD9FCD2

testdata/src/test/assets/extractordumps/mp4/sample_eac3_fragmented.mp4.1.dump

@@ -7,8 +7,8 @@ seekMap:
   getPosition(1728000) = [[timeUs=0, position=638]]
 numberOfTracks = 1
 track 0:
-  total output bytes = 148000
-  sample count = 37
+  total output bytes = 144000
+  sample count = 36
   format 0:
     peakBitrate = 1000000
     id = 1
@@ -17,150 +17,146 @@ track 0:
     sampleRate = 48000
     language = und
   sample 0:
-    time = 544000
-    flags = 1
-    data = length 4000, hash 27F20D29
-  sample 1:
     time = 576000
     flags = 1
     data = length 4000, hash 6F565894
-  sample 2:
+  sample 1:
     time = 608000
     flags = 1
     data = length 4000, hash A6F07C4A
-  sample 3:
+  sample 2:
     time = 640000
     flags = 1
     data = length 4000, hash 3A0CA15C
-  sample 4:
+  sample 3:
     time = 672000
     flags = 1
     data = length 4000, hash DB365414
-  sample 5:
+  sample 4:
     time = 704000
     flags = 1
     data = length 4000, hash 31E08469
-  sample 6:
+  sample 5:
     time = 736000
     flags = 1
     data = length 4000, hash 315F5C28
-  sample 7:
+  sample 6:
     time = 768000
     flags = 1
     data = length 4000, hash CC65DF80
-  sample 8:
+  sample 7:
     time = 800000
     flags = 1
     data = length 4000, hash 503FB64C
-  sample 9:
+  sample 8:
     time = 832000
     flags = 1
     data = length 4000, hash 817CF735
-  sample 10:
+  sample 9:
     time = 864000
     flags = 1
     data = length 4000, hash 37391ADA
-  sample 11:
+  sample 10:
     time = 896000
     flags = 1
     data = length 4000, hash 37391ADA
-  sample 12:
+  sample 11:
     time = 928000
     flags = 1
     data = length 4000, hash 64DBF751
-  sample 13:
+  sample 12:
     time = 960000
     flags = 1
     data = length 4000, hash 81AE828E
-  sample 14:
+  sample 13:
     time = 992000
     flags = 1
     data = length 4000, hash 767D6C98
-  sample 15:
+  sample 14:
     time = 1024000
     flags = 1
     data = length 4000, hash A5F6D4E
-  sample 16:
+  sample 15:
     time = 1056000
     flags = 1
     data = length 4000, hash EABC6B0D
-  sample 17:
+  sample 16:
     time = 1088000
     flags = 1
     data = length 4000, hash F47EF742
-  sample 18:
+  sample 17:
     time = 1120000
     flags = 1
     data = length 4000, hash 9B2549DA
-  sample 19:
+  sample 18:
     time = 1152000
     flags = 1
     data = length 4000, hash A12733C9
-  sample 20:
+  sample 19:
     time = 1184000
     flags = 1
     data = length 4000, hash 95F62E99
-  sample 21:
+  sample 20:
     time = 1216000
     flags = 1
     data = length 4000, hash A4D858
-  sample 22:
+  sample 21:
     time = 1248000
     flags = 1
     data = length 4000, hash A4D858
-  sample 23:
+  sample 22:
     time = 1280000
     flags = 1
     data = length 4000, hash 22C1A129
-  sample 24:
+  sample 23:
     time = 1312000
     flags = 1
     data = length 4000, hash 2C51E4A1
-  sample 25:
+  sample 24:
     time = 1344000
     flags = 1
     data = length 4000, hash 3782E8BB
-  sample 26:
+  sample 25:
     time = 1376000
     flags = 1
     data = length 4000, hash 2C51E4A1
-  sample 27:
+  sample 26:
     time = 1408000
     flags = 1
     data = length 4000, hash BDB3D129
-  sample 28:
+  sample 27:
     time = 1440000
     flags = 1
     data = length 4000, hash F642A55
-  sample 29:
+  sample 28:
     time = 1472000
     flags = 1
     data = length 4000, hash 32F259F4
-  sample 30:
+  sample 29:
     time = 1504000
     flags = 1
     data = length 4000, hash 4C987B7C
-  sample 31:
+  sample 30:
     time = 1536000
     flags = 1
     data = length 4000, hash 57C98E1C
-  sample 32:
+  sample 31:
     time = 1568000
     flags = 1
     data = length 4000, hash 4C987B7C
-  sample 33:
+  sample 32:
     time = 1600000
     flags = 1
     data = length 4000, hash 4C987B7C
-  sample 34:
+  sample 33:
     time = 1632000
     flags = 1
     data = length 4000, hash 4C987B7C
-  sample 35:
+  sample 34:
     time = 1664000
     flags = 1
     data = length 4000, hash 4C987B7C
-  sample 36:
+  sample 35:
     time = 1696000
     flags = 1
     data = length 4000, hash 4C987B7C