ServerSideAdInsertionMediaSourceTest adjustments

Some adjustments to the test to make it more correct and prevent it
from becoming flaky:
 - Use separate output dump files per test setup. Once we add more data
   to these files, they are not guaranteed to be the same anymore.
 - Use a seek position that is actually behind the midroll as described
   in the test setup.
 - Change ad insertion position to ensure the ad group duration doesn't
   exceed the underlying media duration.
 - Add a wait for isLoading to ensure the late insertion of an ad group
   happens consistently at the same processing stage.

PiperOrigin-RevId: 546825183

libraries/exoplayer/src/test/java/androidx/media3/exoplayer/source/ads/ServerSideAdInsertionMediaSourceTest.java

@@ -20,6 +20,7 @@ import static androidx.media3.common.util.Assertions.checkNotNull;
 import static androidx.media3.exoplayer.source.ads.ServerSideAdInsertionUtil.addAdGroupToAdPlaybackState;
 import static androidx.media3.test.utils.robolectric.RobolectricUtil.runMainLooperUntil;
 import static androidx.media3.test.utils.robolectric.TestPlayerRunHelper.playUntilPosition;
+import static androidx.media3.test.utils.robolectric.TestPlayerRunHelper.runUntilIsLoading;
 import static androidx.media3.test.utils.robolectric.TestPlayerRunHelper.runUntilPendingCommandsAreFullyHandled;
 import static androidx.media3.test.utils.robolectric.TestPlayerRunHelper.runUntilPlaybackState;
 import static com.google.common.truth.Truth.assertThat;
@@ -82,7 +83,6 @@ public final class ServerSideAdInsertionMediaSourceTest {
       ShadowMediaCodecConfig.forAllSupportedMimeTypes();
 
   private static final String TEST_ASSET = "asset:///media/mp4/sample.mp4";
-  private static final String TEST_ASSET_DUMP = "playbackdumps/mp4/ssai-sample.mp4.dump";
 
   @Test
   public void timeline_vodSinglePeriod_containsAdsDefinedInAdPlaybackState() throws Exception {
@@ -440,7 +440,8 @@ public final class ServerSideAdInsertionMediaSourceTest {
     player.release();
 
     // Assert all samples have been played.
-    DumpFileAsserts.assertOutput(context, playbackOutput, TEST_ASSET_DUMP);
+    DumpFileAsserts.assertOutput(
+        context, playbackOutput, "playbackdumps/mp4/ssai-predefined-ads.mp4.dump");
     // Assert playback has been reported with ads: [ad0][content][ad1][content][ad2][content]
     // 6*2(audio+video) format changes, 5 discontinuities between parts.
     verify(listener, times(5))
@@ -469,7 +470,7 @@ public final class ServerSideAdInsertionMediaSourceTest {
     AdPlaybackState firstAdPlaybackState =
         addAdGroupToAdPlaybackState(
             new AdPlaybackState(/* adsId= */ new Object()),
-            /* fromPositionUs= */ 900_000,
+            /* fromPositionUs= */ 700_000,
             /* contentResumeOffsetUs= */ 0,
             /* adDurationsUs...= */ 100_000);
     AtomicReference<ServerSideAdInsertionMediaSource> mediaSourceRef = new AtomicReference<>();
@@ -497,6 +498,8 @@ public final class ServerSideAdInsertionMediaSourceTest {
 
     // Add ad at the current playback position during playback.
     runUntilPlaybackState(player, Player.STATE_READY);
+    runUntilIsLoading(player, false);
+    runMainLooperUntil(() -> player.getBufferedPercentage() == 100);
     AdPlaybackState secondAdPlaybackState =
         addAdGroupToAdPlaybackState(
             firstAdPlaybackState,
@@ -514,7 +517,8 @@ public final class ServerSideAdInsertionMediaSourceTest {
     player.release();
 
     // Assert all samples have been played.
-    DumpFileAsserts.assertOutput(context, playbackOutput, TEST_ASSET_DUMP);
+    DumpFileAsserts.assertOutput(
+        context, playbackOutput, "playbackdumps/mp4/ssai-newly-inserted-adgroup.mp4.dump");
     assertThat(contentTimelines).hasSize(2);
     // Assert playback has been reported with ads: [content][ad0][content][ad1][content]
     // 5*2(audio+video) format changes, 4 discontinuities between parts.
@@ -592,7 +596,8 @@ public final class ServerSideAdInsertionMediaSourceTest {
     player.release();
 
     // Assert all samples have been played.
-    DumpFileAsserts.assertOutput(context, playbackOutput, TEST_ASSET_DUMP);
+    DumpFileAsserts.assertOutput(
+        context, playbackOutput, "playbackdumps/mp4/ssai-extended-adgroup.mp4.dump");
     assertThat(contentTimelines).hasSize(2);
     // Assert playback has been reported with ads: [ad0][ad1][ad2][content]
     // 4*2(audio+video) format changes, 3 discontinuities between parts.
@@ -656,7 +661,7 @@ public final class ServerSideAdInsertionMediaSourceTest {
     player.setMediaSource(mediaSourceRef.get());
     player.prepare();
     // Play to the first content part, then seek past the midroll.
-    playUntilPosition(player, /* mediaItemIndex= */ 0, /* positionMs= */ 100);
+    playUntilPosition(player, /* mediaItemIndex= */ 0, /* positionMs= */ 150);
     player.seekTo(/* positionMs= */ 1_600);
     runUntilPendingCommandsAreFullyHandled(player);
     long positionAfterSeekMs = player.getCurrentPosition();

libraries/test_data/src/test/assets/playbackdumps/mp4/ssai-newly-inserted-adgroup.mp4.dump

@@ -0,0 +1,79 @@
+MediaCodecAdapter (exotest.audio.aac):
+  buffers.length = 44
+  buffers[0] = length 23, hash 47DE9131
+  buffers[1] = length 6, hash 31EC5206
+  buffers[2] = length 148, hash 894A176B
+  buffers[3] = length 189, hash CEF235A1
+  buffers[4] = length 205, hash BBF5F7B0
+  buffers[5] = length 210, hash F278B193
+  buffers[6] = length 210, hash 82DA1589
+  buffers[7] = length 207, hash 5BE231DF
+  buffers[8] = length 225, hash 18819EE1
+  buffers[9] = length 215, hash CA7FA67B
+  buffers[10] = length 211, hash 581A1C18
+  buffers[11] = length 216, hash ADB88187
+  buffers[12] = length 229, hash 2E8BA4DC
+  buffers[13] = length 232, hash 22F0C510
+  buffers[14] = length 235, hash 867AD0DC
+  buffers[15] = length 231, hash 84E823A8
+  buffers[16] = length 226, hash 1BEF3A95
+  buffers[17] = length 216, hash EAA345AE
+  buffers[18] = length 229, hash 6957411F
+  buffers[19] = length 219, hash 41275022
+  buffers[20] = length 241, hash 6495DF96
+  buffers[21] = length 228, hash 63D95906
+  buffers[22] = length 238, hash 34F676F9
+  buffers[23] = length 234, hash E5CBC045
+  buffers[24] = length 231, hash 5FC43661
+  buffers[25] = length 217, hash 682708ED
+  buffers[26] = length 239, hash D43780FC
+  buffers[27] = length 243, hash C5E17980
+  buffers[28] = length 231, hash AC5837BA
+  buffers[29] = length 230, hash 169EE895
+  buffers[30] = length 238, hash C48FF3F1
+  buffers[31] = length 225, hash 531E4599
+  buffers[32] = length 232, hash CB3C6B8D
+  buffers[33] = length 243, hash F8C94C7
+  buffers[34] = length 232, hash A646A7D0
+  buffers[35] = length 237, hash E8B787A5
+  buffers[36] = length 228, hash 3FA7A29F
+  buffers[37] = length 235, hash B9B33B0A
+  buffers[38] = length 264, hash 71A4869E
+  buffers[39] = length 257, hash D049B54C
+  buffers[40] = length 227, hash 66757231
+  buffers[41] = length 227, hash BD374F1B
+  buffers[42] = length 235, hash 999477F6
+  buffers[43] = length 0, hash 1
+MediaCodecAdapter (exotest.video.avc):
+  buffers.length = 31
+  buffers[0] = length 36692, hash D216076E
+  buffers[1] = length 5312, hash D45D3CA0
+  buffers[2] = length 599, hash 1BE7812D
+  buffers[3] = length 7735, hash 4490F110
+  buffers[4] = length 987, hash 560B5036
+  buffers[5] = length 673, hash ED7CD8C7
+  buffers[6] = length 523, hash 3020DF50
+  buffers[7] = length 6061, hash 736C72B2
+  buffers[8] = length 992, hash FE132F23
+  buffers[9] = length 623, hash 5B2C1816
+  buffers[10] = length 421, hash 742E69C1
+  buffers[11] = length 4899, hash F72F86A1
+  buffers[12] = length 568, hash 519A8E50
+  buffers[13] = length 620, hash 3990AA39
+  buffers[14] = length 5450, hash F06EC4AA
+  buffers[15] = length 1051, hash 92DFA63A
+  buffers[16] = length 874, hash 69587FB4
+  buffers[17] = length 781, hash 36BE495B
+  buffers[18] = length 4725, hash AC0C8CD3
+  buffers[19] = length 1022, hash 5D8BFF34
+  buffers[20] = length 790, hash 99413A99
+  buffers[21] = length 610, hash 5E129290
+  buffers[22] = length 2751, hash 769974CB
+  buffers[23] = length 745, hash B78A477A
+  buffers[24] = length 621, hash CF741E7A
+  buffers[25] = length 505, hash 1DB4894E
+  buffers[26] = length 1268, hash C15348DC
+  buffers[27] = length 880, hash C2DE85D0
+  buffers[28] = length 530, hash C98BC6A8
+  buffers[29] = length 568, hash 4FE5C8EA
+  buffers[30] = length 0, hash 1

libraries/test_data/src/test/assets/playbackdumps/mp4/ssai-predefined-ads.mp4.dump

@@ -0,0 +1,79 @@
+MediaCodecAdapter (exotest.audio.aac):
+  buffers.length = 44
+  buffers[0] = length 23, hash 47DE9131
+  buffers[1] = length 6, hash 31EC5206
+  buffers[2] = length 148, hash 894A176B
+  buffers[3] = length 189, hash CEF235A1
+  buffers[4] = length 205, hash BBF5F7B0
+  buffers[5] = length 210, hash F278B193
+  buffers[6] = length 210, hash 82DA1589
+  buffers[7] = length 207, hash 5BE231DF
+  buffers[8] = length 225, hash 18819EE1
+  buffers[9] = length 215, hash CA7FA67B
+  buffers[10] = length 211, hash 581A1C18
+  buffers[11] = length 216, hash ADB88187
+  buffers[12] = length 229, hash 2E8BA4DC
+  buffers[13] = length 232, hash 22F0C510
+  buffers[14] = length 235, hash 867AD0DC
+  buffers[15] = length 231, hash 84E823A8
+  buffers[16] = length 226, hash 1BEF3A95
+  buffers[17] = length 216, hash EAA345AE
+  buffers[18] = length 229, hash 6957411F
+  buffers[19] = length 219, hash 41275022
+  buffers[20] = length 241, hash 6495DF96
+  buffers[21] = length 228, hash 63D95906
+  buffers[22] = length 238, hash 34F676F9
+  buffers[23] = length 234, hash E5CBC045
+  buffers[24] = length 231, hash 5FC43661
+  buffers[25] = length 217, hash 682708ED
+  buffers[26] = length 239, hash D43780FC
+  buffers[27] = length 243, hash C5E17980
+  buffers[28] = length 231, hash AC5837BA
+  buffers[29] = length 230, hash 169EE895
+  buffers[30] = length 238, hash C48FF3F1
+  buffers[31] = length 225, hash 531E4599
+  buffers[32] = length 232, hash CB3C6B8D
+  buffers[33] = length 243, hash F8C94C7
+  buffers[34] = length 232, hash A646A7D0
+  buffers[35] = length 237, hash E8B787A5
+  buffers[36] = length 228, hash 3FA7A29F
+  buffers[37] = length 235, hash B9B33B0A
+  buffers[38] = length 264, hash 71A4869E
+  buffers[39] = length 257, hash D049B54C
+  buffers[40] = length 227, hash 66757231
+  buffers[41] = length 227, hash BD374F1B
+  buffers[42] = length 235, hash 999477F6
+  buffers[43] = length 0, hash 1
+MediaCodecAdapter (exotest.video.avc):
+  buffers.length = 31
+  buffers[0] = length 36692, hash D216076E
+  buffers[1] = length 5312, hash D45D3CA0
+  buffers[2] = length 599, hash 1BE7812D
+  buffers[3] = length 7735, hash 4490F110
+  buffers[4] = length 987, hash 560B5036
+  buffers[5] = length 673, hash ED7CD8C7
+  buffers[6] = length 523, hash 3020DF50
+  buffers[7] = length 6061, hash 736C72B2
+  buffers[8] = length 992, hash FE132F23
+  buffers[9] = length 623, hash 5B2C1816
+  buffers[10] = length 421, hash 742E69C1
+  buffers[11] = length 4899, hash F72F86A1
+  buffers[12] = length 568, hash 519A8E50
+  buffers[13] = length 620, hash 3990AA39
+  buffers[14] = length 5450, hash F06EC4AA
+  buffers[15] = length 1051, hash 92DFA63A
+  buffers[16] = length 874, hash 69587FB4
+  buffers[17] = length 781, hash 36BE495B
+  buffers[18] = length 4725, hash AC0C8CD3
+  buffers[19] = length 1022, hash 5D8BFF34
+  buffers[20] = length 790, hash 99413A99
+  buffers[21] = length 610, hash 5E129290
+  buffers[22] = length 2751, hash 769974CB
+  buffers[23] = length 745, hash B78A477A
+  buffers[24] = length 621, hash CF741E7A
+  buffers[25] = length 505, hash 1DB4894E
+  buffers[26] = length 1268, hash C15348DC
+  buffers[27] = length 880, hash C2DE85D0
+  buffers[28] = length 530, hash C98BC6A8
+  buffers[29] = length 568, hash 4FE5C8EA
+  buffers[30] = length 0, hash 1