MP3: Exclude VBRI frame from ToC position calculations

The current code assumes that the first Table of Contents segment
includes the `VBRI` frame, but I don't think this is correct and it
should only include real/audible MP3 ata - so this change updates the
logic to assume the first ToC segment starts at the frame **after** the
`VBRI` frame.

Issue: androidx/media#1904

#cherrypick

PiperOrigin-RevId: 700269811

libraries/extractor/src/main/java/androidx/media3/extractor/mp3/VbriSeeker.java

@@ -15,8 +15,6 @@
  */
 package androidx.media3.extractor.mp3;
 
-import static java.lang.Math.max;
-
 import androidx.annotation.Nullable;
 import androidx.media3.common.C;
 import androidx.media3.common.util.Log;
@@ -63,15 +61,13 @@ import androidx.media3.extractor.SeekPoint;
     int entrySize = frame.readUnsignedShort();
     frame.skipBytes(2);
 
-    long minPosition = position + mpegAudioHeader.frameSize;
+    position += mpegAudioHeader.frameSize;
     // Read table of contents entries.
     long[] timesUs = new long[entryCount];
     long[] positions = new long[entryCount];
     for (int index = 0; index < entryCount; index++) {
       timesUs[index] = (index * durationUs) / entryCount;
-      // Ensure positions do not fall within the frame containing the VBRI header. This constraint
+      positions[index] = position;
-      // will normally only apply to the first entry in the table.
-      positions[index] = max(position, minPosition);
       int segmentSize;
       switch (entrySize) {
         case 1:

libraries/test_data/src/test/assets/extractordumps/mp3/bear-vbr-vbri-header.mp3.0.dump

@@ -2,13 +2,13 @@ seekMap:
   isSeekable = true
   duration = 2808000
   getPosition(0) = [[timeUs=0, position=141]]
-  getPosition(1) = [[timeUs=0, position=141], [timeUs=702000, position=10317]]
+  getPosition(1) = [[timeUs=0, position=141], [timeUs=702000, position=10413]]
-  getPosition(1404000) = [[timeUs=1404000, position=19677]]
+  getPosition(1404000) = [[timeUs=1404000, position=19773]]
-  getPosition(2808000) = [[timeUs=2106000, position=29517]]
+  getPosition(2808000) = [[timeUs=2106000, position=29613]]
 numberOfTracks = 1
 track 0:
-  total output bytes = 38064
+  total output bytes = 38160
-  sample count = 116
+  sample count = 117
   track duration = 2808000
   format 0:
     averageBitrate = 32000
@@ -482,4 +482,8 @@ track 0:
     time = 2760000
     flags = 1
     data = length 120, hash F562B52F
+  sample 116:
+    time = 2784000
+    flags = 1
+    data = length 96, hash FF8D5B98
 tracksEnded = true

libraries/test_data/src/test/assets/extractordumps/mp3/bear-vbr-vbri-header.mp3.1.dump

@@ -2,13 +2,13 @@ seekMap:
   isSeekable = true
   duration = 2808000
   getPosition(0) = [[timeUs=0, position=141]]
-  getPosition(1) = [[timeUs=0, position=141], [timeUs=702000, position=10317]]
+  getPosition(1) = [[timeUs=0, position=141], [timeUs=702000, position=10413]]
-  getPosition(1404000) = [[timeUs=1404000, position=19677]]
+  getPosition(1404000) = [[timeUs=1404000, position=19773]]
-  getPosition(2808000) = [[timeUs=2106000, position=29517]]
+  getPosition(2808000) = [[timeUs=2106000, position=29613]]
 numberOfTracks = 1
 track 0:
-  total output bytes = 27792
+  total output bytes = 27888
-  sample count = 87
+  sample count = 88
   track duration = 2808000
   format 0:
     averageBitrate = 32000
@@ -366,4 +366,8 @@ track 0:
     time = 2766000
     flags = 1
     data = length 120, hash F562B52F
+  sample 87:
+    time = 2790000
+    flags = 1
+    data = length 96, hash FF8D5B98
 tracksEnded = true

libraries/test_data/src/test/assets/extractordumps/mp3/bear-vbr-vbri-header.mp3.2.dump

@@ -2,13 +2,13 @@ seekMap:
   isSeekable = true
   duration = 2808000
   getPosition(0) = [[timeUs=0, position=141]]
-  getPosition(1) = [[timeUs=0, position=141], [timeUs=702000, position=10317]]
+  getPosition(1) = [[timeUs=0, position=141], [timeUs=702000, position=10413]]
-  getPosition(1404000) = [[timeUs=1404000, position=19677]]
+  getPosition(1404000) = [[timeUs=1404000, position=19773]]
-  getPosition(2808000) = [[timeUs=2106000, position=29517]]
+  getPosition(2808000) = [[timeUs=2106000, position=29613]]
 numberOfTracks = 1
 track 0:
-  total output bytes = 18432
+  total output bytes = 18528
-  sample count = 58
+  sample count = 59
   track duration = 2808000
   format 0:
     averageBitrate = 32000
@@ -250,4 +250,8 @@ track 0:
     time = 2772000
     flags = 1
     data = length 120, hash F562B52F
+  sample 58:
+    time = 2796000
+    flags = 1
+    data = length 96, hash FF8D5B98
 tracksEnded = true

libraries/test_data/src/test/assets/extractordumps/mp3/bear-vbr-vbri-header.mp3.3.dump

@@ -2,13 +2,13 @@ seekMap:
   isSeekable = true
   duration = 2808000
   getPosition(0) = [[timeUs=0, position=141]]
-  getPosition(1) = [[timeUs=0, position=141], [timeUs=702000, position=10317]]
+  getPosition(1) = [[timeUs=0, position=141], [timeUs=702000, position=10413]]
-  getPosition(1404000) = [[timeUs=1404000, position=19677]]
+  getPosition(1404000) = [[timeUs=1404000, position=19773]]
-  getPosition(2808000) = [[timeUs=2106000, position=29517]]
+  getPosition(2808000) = [[timeUs=2106000, position=29613]]
 numberOfTracks = 1
 track 0:
-  total output bytes = 8592
+  total output bytes = 8688
-  sample count = 29
+  sample count = 30
   track duration = 2808000
   format 0:
     averageBitrate = 32000
@@ -134,4 +134,8 @@ track 0:
     time = 2778000
     flags = 1
     data = length 120, hash F562B52F
+  sample 29:
+    time = 2802000
+    flags = 1
+    data = length 96, hash FF8D5B98
 tracksEnded = true

libraries/test_data/src/test/assets/extractordumps/mp3/bear-vbr-vbri-header.mp3.unknown_length.dump

@@ -2,13 +2,13 @@ seekMap:
   isSeekable = true
   duration = 2808000
   getPosition(0) = [[timeUs=0, position=141]]
-  getPosition(1) = [[timeUs=0, position=141], [timeUs=702000, position=10317]]
+  getPosition(1) = [[timeUs=0, position=141], [timeUs=702000, position=10413]]
-  getPosition(1404000) = [[timeUs=1404000, position=19677]]
+  getPosition(1404000) = [[timeUs=1404000, position=19773]]
-  getPosition(2808000) = [[timeUs=2106000, position=29517]]
+  getPosition(2808000) = [[timeUs=2106000, position=29613]]
 numberOfTracks = 1
 track 0:
-  total output bytes = 38064
+  total output bytes = 38160
-  sample count = 116
+  sample count = 117
   track duration = 2808000
   format 0:
     averageBitrate = 32000
@@ -482,4 +482,8 @@ track 0:
     time = 2760000
     flags = 1
     data = length 120, hash F562B52F
+  sample 116:
+    time = 2784000
+    flags = 1
+    data = length 96, hash FF8D5B98
 tracksEnded = true