Throw when inferred sample MIME type is not supported by the muxer.

This is better than silently dropping tracks as done previously. Later,
we will implement fallback to transcoding to a supported MIME type.

PiperOrigin-RevId: 418006258

libraries/test_data/src/test/assets/transformerdumps/mkv/sample_with_srt.mkv.dump

 containerMimeType = video/mp4
 format 0:
+  sampleMimeType = audio/mp4a-latm
+  channelCount = 1
+  sampleRate = 44100
+  pcmEncoding = 2
+format 1:
   id = 1
   sampleMimeType = video/avc
   codecs = avc1.640034
@@ -11,181 +16,355 @@ format 0:
     data = length 30, hash F6F3D010
     data = length 10, hash 7A0D0F2B
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -252482306
   size = 36477
   isKeyFrame = true
   presentationTimeUs = 0
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = 67864034
   size = 5341
   isKeyFrame = false
   presentationTimeUs = 67000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = 897273234
   size = 596
   isKeyFrame = false
   presentationTimeUs = 33000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -1549870586
   size = 7704
   isKeyFrame = false
   presentationTimeUs = 200000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = 672384813
   size = 989
   isKeyFrame = false
   presentationTimeUs = 133000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -988996493
   size = 721
   isKeyFrame = false
   presentationTimeUs = 100000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = 1711151377
   size = 519
   isKeyFrame = false
   presentationTimeUs = 167000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -506806036
   size = 6160
   isKeyFrame = false
   presentationTimeUs = 333000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = 1902167649
   size = 953
   isKeyFrame = false
   presentationTimeUs = 267000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = 2054873212
   size = 620
   isKeyFrame = false
   presentationTimeUs = 233000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = 1556608231
   size = 405
   isKeyFrame = false
   presentationTimeUs = 300000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -1648978019
   size = 4852
   isKeyFrame = false
   presentationTimeUs = 433000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -484808327
   size = 547
   isKeyFrame = false
   presentationTimeUs = 400000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -20706048
   size = 570
   isKeyFrame = false
   presentationTimeUs = 367000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = 2085064574
   size = 5525
   isKeyFrame = false
   presentationTimeUs = 567000
 sample:
   trackIndex = 0
+  dataHashCode = 555688582
+  size = 416
+  isKeyFrame = true
+  presentationTimeUs = 0
+sample:
+  trackIndex = 0
+  dataHashCode = 2000837254
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 4717
+sample:
+  trackIndex = 0
+  dataHashCode = -1593942879
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 9456
+sample:
+  trackIndex = 0
+  dataHashCode = 587837542
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 14196
+sample:
+  trackIndex = 0
+  dataHashCode = -1836423877
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 18935
+sample:
+  trackIndex = 0
+  dataHashCode = 874705099
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 23674
+sample:
+  trackIndex = 0
+  dataHashCode = -269206181
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 28413
+sample:
+  trackIndex = 0
+  dataHashCode = -58682425
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 33152
+sample:
+  trackIndex = 0
+  dataHashCode = -859796970
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 37892
+sample:
+  trackIndex = 0
+  dataHashCode = 711911523
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 42631
+sample:
+  trackIndex = 0
+  dataHashCode = -694513071
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 47370
+sample:
+  trackIndex = 0
+  dataHashCode = -1124371059
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 52109
+sample:
+  trackIndex = 0
+  dataHashCode = 297166745
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 56849
+sample:
+  trackIndex = 0
+  dataHashCode = -937110638
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 61588
+sample:
+  trackIndex = 0
+  dataHashCode = -1050158990
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 66327
+sample:
+  trackIndex = 0
+  dataHashCode = 1109510229
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 71066
+sample:
+  trackIndex = 0
+  dataHashCode = 1297086772
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 75805
+sample:
+  trackIndex = 0
+  dataHashCode = -1739939803
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 80545
+sample:
+  trackIndex = 0
+  dataHashCode = -1149727930
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 85284
+sample:
+  trackIndex = 0
+  dataHashCode = -1627652713
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 90023
+sample:
+  trackIndex = 0
+  dataHashCode = -551926260
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 94762
+sample:
+  trackIndex = 0
+  dataHashCode = 45987178
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 99502
+sample:
+  trackIndex = 0
+  dataHashCode = -903675808
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 104241
+sample:
+  trackIndex = 0
+  dataHashCode = -755916991
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 108980
+sample:
+  trackIndex = 0
+  dataHashCode = -1355207303
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 113719
+sample:
+  trackIndex = 0
+  dataHashCode = -975703389
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 118459
+sample:
+  trackIndex = 0
+  dataHashCode = 1933194670
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 123198
+sample:
+  trackIndex = 0
+  dataHashCode = -565778989
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 127937
+sample:
+  trackIndex = 0
+  dataHashCode = 1454083383
+  size = 418
+  isKeyFrame = true
+  presentationTimeUs = 132676
+sample:
+  trackIndex = 1
   dataHashCode = -637074022
   size = 1082
   isKeyFrame = false
   presentationTimeUs = 500000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -1824027029
   size = 807
   isKeyFrame = false
   presentationTimeUs = 467000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -1701945306
   size = 744
   isKeyFrame = false
   presentationTimeUs = 533000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -952425536
   size = 4732
   isKeyFrame = false
   presentationTimeUs = 700000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -1978031576
   size = 1004
   isKeyFrame = false
   presentationTimeUs = 633000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -2128215508
   size = 794
   isKeyFrame = false
   presentationTimeUs = 600000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -259850011
   size = 645
   isKeyFrame = false
   presentationTimeUs = 667000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = 1920983928
   size = 2684
   isKeyFrame = false
   presentationTimeUs = 833000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = 1100642337
   size = 787
   isKeyFrame = false
   presentationTimeUs = 767000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = 1544917830
   size = 649
   isKeyFrame = false
   presentationTimeUs = 733000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -116205995
   size = 509
   isKeyFrame = false
   presentationTimeUs = 800000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = 696343585
   size = 1226
   isKeyFrame = false
   presentationTimeUs = 967000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -644371190
   size = 898
   isKeyFrame = false
   presentationTimeUs = 900000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -1606273467
   size = 476
   isKeyFrame = false
   presentationTimeUs = 867000
 sample:
-  trackIndex = 0
+  trackIndex = 1
   dataHashCode = -571265861
   size = 486
   isKeyFrame = false

libraries/test_data/src/test/assets/transformerdumps/mp4/sample_18byte_nclx_colr.mp4.dump

+containerMimeType = video/mp4
+format 0:
+  id = 1
+  sampleMimeType = video/avc
+  codecs = avc1.64001F
+  maxInputSize = 36722
+  width = 1080
+  height = 720
+  frameRate = 29.970028
+  colorInfo:
+    colorSpace = 1
+    colorRange = 2
+    colorTransfer = 3
+    hdrStaticInfo = length 0, hash 0
+  initializationData:
+    data = length 29, hash 4746B5D9
+    data = length 10, hash 7A0D0F2B
+sample:
+  trackIndex = 0
+  dataHashCode = -770308242
+  size = 36692
+  isKeyFrame = true
+  presentationTimeUs = 0
+sample:
+  trackIndex = 0
+  dataHashCode = -732087136
+  size = 5312
+  isKeyFrame = false
+  presentationTimeUs = 66733
+sample:
+  trackIndex = 0
+  dataHashCode = 468156717
+  size = 599
+  isKeyFrame = false
+  presentationTimeUs = 33366
+sample:
+  trackIndex = 0
+  dataHashCode = 1150349584
+  size = 7735
+  isKeyFrame = false
+  presentationTimeUs = 200200
+sample:
+  trackIndex = 0
+  dataHashCode = 1443582006
+  size = 987
+  isKeyFrame = false
+  presentationTimeUs = 133466
+sample:
+  trackIndex = 0
+  dataHashCode = -310585145
+  size = 673
+  isKeyFrame = false
+  presentationTimeUs = 100100
+sample:
+  trackIndex = 0
+  dataHashCode = 807460688
+  size = 523
+  isKeyFrame = false
+  presentationTimeUs = 166833
+sample:
+  trackIndex = 0
+  dataHashCode = 1936487090
+  size = 6061
+  isKeyFrame = false
+  presentationTimeUs = 333666
+sample:
+  trackIndex = 0
+  dataHashCode = -32297181
+  size = 992
+  isKeyFrame = false
+  presentationTimeUs = 266933
+sample:
+  trackIndex = 0
+  dataHashCode = 1529616406
+  size = 623
+  isKeyFrame = false
+  presentationTimeUs = 233566
+sample:
+  trackIndex = 0
+  dataHashCode = 1949198785
+  size = 421
+  isKeyFrame = false
+  presentationTimeUs = 300300
+sample:
+  trackIndex = 0
+  dataHashCode = -147880287
+  size = 4899
+  isKeyFrame = false
+  presentationTimeUs = 433766
+sample:
+  trackIndex = 0
+  dataHashCode = 1369083472
+  size = 568
+  isKeyFrame = false
+  presentationTimeUs = 400400
+sample:
+  trackIndex = 0
+  dataHashCode = 965782073
+  size = 620
+  isKeyFrame = false
+  presentationTimeUs = 367033
+sample:
+  trackIndex = 0
+  dataHashCode = -261176150
+  size = 5450
+  isKeyFrame = false
+  presentationTimeUs = 567233
+sample:
+  trackIndex = 0
+  dataHashCode = -1830836678
+  size = 1051
+  isKeyFrame = false
+  presentationTimeUs = 500500
+sample:
+  trackIndex = 0
+  dataHashCode = 1767407540
+  size = 874
+  isKeyFrame = false
+  presentationTimeUs = 467133
+sample:
+  trackIndex = 0
+  dataHashCode = 918440283
+  size = 781
+  isKeyFrame = false
+  presentationTimeUs = 533866
+sample:
+  trackIndex = 0
+  dataHashCode = -1408463661
+  size = 4725
+  isKeyFrame = false
+  presentationTimeUs = 700700
+sample:
+  trackIndex = 0
+  dataHashCode = 1569455924
+  size = 1022
+  isKeyFrame = false
+  presentationTimeUs = 633966
+sample:
+  trackIndex = 0
+  dataHashCode = -1723778407
+  size = 790
+  isKeyFrame = false
+  presentationTimeUs = 600600
+sample:
+  trackIndex = 0
+  dataHashCode = 1578275472
+  size = 610
+  isKeyFrame = false
+  presentationTimeUs = 667333
+sample:
+  trackIndex = 0
+  dataHashCode = 1989768395
+  size = 2751
+  isKeyFrame = false
+  presentationTimeUs = 834166
+sample:
+  trackIndex = 0
+  dataHashCode = -1215674502
+  size = 745
+  isKeyFrame = false
+  presentationTimeUs = 767433
+sample:
+  trackIndex = 0
+  dataHashCode = -814473606
+  size = 621
+  isKeyFrame = false
+  presentationTimeUs = 734066
+sample:
+  trackIndex = 0
+  dataHashCode = 498370894
+  size = 505
+  isKeyFrame = false
+  presentationTimeUs = 800800
+sample:
+  trackIndex = 0
+  dataHashCode = -1051506468
+  size = 1268
+  isKeyFrame = false
+  presentationTimeUs = 967633
+sample:
+  trackIndex = 0
+  dataHashCode = -1025604144
+  size = 880
+  isKeyFrame = false
+  presentationTimeUs = 900900
+sample:
+  trackIndex = 0
+  dataHashCode = -913586520
+  size = 530
+  isKeyFrame = false
+  presentationTimeUs = 867533
+sample:
+  trackIndex = 0
+  dataHashCode = 1340459242
+  size = 568
+  isKeyFrame = false
+  presentationTimeUs = 934266
+released = true

libraries/transformer/src/main/java/androidx/media3/transformer/TransformationException.java

@@ -161,6 +161,16 @@ public final class TransformationException extends Exception {
   /** Caused by an audio processor initialization failure. */
   public static final int ERROR_CODE_AUDIO_PROCESSOR_INIT_FAILED = 6001;
 
+  // Muxing errors (7xxx).
+
+  /**
+   * Caused by an output sample MIME type inferred from the input not being supported by the muxer.
+   *
+   * <p>Use {@link TransformationRequest.Builder#setAudioMimeType(String)} or {@link
+   * TransformationRequest.Builder#setVideoMimeType(String)} to transcode to a supported MIME type.
+   */
+  public static final int ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED = 7001;
+
   private static final ImmutableBiMap<String, @ErrorCode Integer> NAME_TO_ERROR_CODE =
       new ImmutableBiMap.Builder<String, @ErrorCode Integer>()
           .put("ERROR_CODE_FAILED_RUNTIME_CHECK", ERROR_CODE_FAILED_RUNTIME_CHECK)
@@ -182,6 +192,9 @@ public final class TransformationException extends Exception {
           .put("ERROR_CODE_GL_INIT_FAILED", ERROR_CODE_GL_INIT_FAILED)
           .put("ERROR_CODE_GL_PROCESSING_FAILED", ERROR_CODE_GL_PROCESSING_FAILED)
           .put("ERROR_CODE_AUDIO_PROCESSOR_INIT_FAILED", ERROR_CODE_AUDIO_PROCESSOR_INIT_FAILED)
+          .put(
+              "ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED",
+              ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED)
           .buildOrThrow();
 
   /** Returns the {@code errorCode} for a given name. */
@@ -233,6 +246,17 @@ public final class TransformationException extends Exception {
   }
 
   /**
+   * Creates an instance for a muxer related exception.
+   *
+   * @param cause The cause of the failure.
+   * @param errorCode See {@link #errorCode}.
+   * @return The created instance.
+   */
+  /* package */ static TransformationException createForMuxer(Throwable cause, int errorCode) {
+    return new TransformationException("Muxer error", cause, errorCode);
+  }
+
+  /**
    * Creates an instance for an unexpected exception.
    *
    * <p>If the exception is a runtime exception, error code {@link #ERROR_CODE_FAILED_RUNTIME_CHECK}

libraries/transformer/src/main/java/androidx/media3/transformer/Transformer.java

@@ -808,13 +808,9 @@ public final class Transformer {
     @Override
     public void onTracksInfoChanged(TracksInfo tracksInfo) {
       if (muxerWrapper.getTrackCount() == 0) {
-        // TODO(b/209469847): Do not silently drop unsupported tracks and throw a more specific
-        // exception earlier.
         handleTransformationEnded(
             TransformationException.createForUnexpected(
-                new IllegalStateException(
-                    "The output does not contain any tracks. Check that at least one of the input"
-                        + " sample formats is supported.")));
+                new IllegalStateException("The output does not contain any tracks.")));
       }
     }
 

libraries/transformer/src/main/java/androidx/media3/transformer/TransformerBaseRenderer.java

@@ -16,6 +16,7 @@
 
 package androidx.media3.transformer;
 
+import static androidx.media3.common.util.Assertions.checkState;
 import static androidx.media3.common.util.Assertions.checkStateNotNull;
 
 import androidx.annotation.Nullable;
@@ -57,26 +58,46 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
     this.transformationRequest = transformationRequest;
   }
 
+  /**
+   * Returns whether the renderer supports the track type of the given input format.
+   *
+   * @param inputFormat The input format.
+   * @return The {@link Capabilities} for this format.
+   * @throws ExoPlaybackException If the muxer does not support the output sample MIME type derived
+   *     from the input {@code format} and {@link TransformationRequest}.
+   */
   @Override
-  @C.FormatSupport
-  public final int supportsFormat(Format format) {
-    @Nullable String sampleMimeType = format.sampleMimeType;
-    if (MimeTypes.getTrackType(sampleMimeType) != getTrackType()) {
+  @Capabilities
+  public final int supportsFormat(Format inputFormat) throws ExoPlaybackException {
+    @Nullable String inputSampleMimeType = inputFormat.sampleMimeType;
+    if (inputSampleMimeType == null
+        || MimeTypes.getTrackType(inputSampleMimeType) != getTrackType()) {
       return RendererCapabilities.create(C.FORMAT_UNSUPPORTED_TYPE);
-    } else if ((MimeTypes.isAudio(sampleMimeType)
-            && muxerWrapper.supportsSampleMimeType(
-                transformationRequest.audioMimeType == null
-                    ? sampleMimeType
-                    : transformationRequest.audioMimeType))
-        || (MimeTypes.isVideo(sampleMimeType)
-            && muxerWrapper.supportsSampleMimeType(
-                transformationRequest.videoMimeType == null
-                    ? sampleMimeType
-                    : transformationRequest.videoMimeType))) {
+    }
+
+    // If the output sample MIME type is given in the transformationRequest it has already been
+    // validated by the builder.
+    if (MimeTypes.isAudio(inputSampleMimeType) && transformationRequest.audioMimeType != null) {
+      checkState(muxerWrapper.supportsSampleMimeType(transformationRequest.audioMimeType));
+      return RendererCapabilities.create(C.FORMAT_HANDLED);
+    }
+    if (MimeTypes.isVideo(inputSampleMimeType) && transformationRequest.videoMimeType != null) {
+      checkState(muxerWrapper.supportsSampleMimeType(transformationRequest.videoMimeType));
       return RendererCapabilities.create(C.FORMAT_HANDLED);
-    } else {
-      return RendererCapabilities.create(C.FORMAT_UNSUPPORTED_SUBTYPE);
     }
+
+    // When the output sample MIME type is not given in the transformationRequest, it is inferred
+    // from the input.
+    if (muxerWrapper.supportsSampleMimeType(inputSampleMimeType)) {
+      return RendererCapabilities.create(C.FORMAT_HANDLED);
+    }
+    throw wrapTransformationException(
+        TransformationException.createForMuxer(
+            new IllegalArgumentException(
+                "The sample MIME inferred from the input is not supported by the muxer. "
+                    + "Input sample MIME type: "
+                    + inputSampleMimeType),
+            TransformationException.ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED));
   }
 
   @Override
@@ -103,16 +124,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
 
       while (feedMuxerFromPipeline() || samplePipeline.processData() || feedPipelineFromInput()) {}
     } catch (TransformationException e) {
-      // Transformer extracts the TransformationException from this ExoPlaybackException again. This
-      // temporary wrapping is needed due to the dependence on ExoPlayer's BaseRenderer.
-      throw ExoPlaybackException.createForRenderer(
-          e,
-          "Transformer",
-          getIndex(),
-          /* rendererFormat= */ null,
-          C.FORMAT_HANDLED,
-          /* isRecoverable= */ false,
-          PlaybackException.ERROR_CODE_UNSPECIFIED);
+      throw wrapTransformationException(e);
     }
   }
 
@@ -226,4 +238,23 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
         return false;
     }
   }
+
+  /**
+   * Returns an {@link ExoPlaybackException} wrapping the {@link TransformationException}.
+   *
+   * <p>This temporary wrapping is needed due to the dependence on ExoPlayer's BaseRenderer. {@link
+   * Transformer} extracts the {@link TransformationException} from this {@link
+   * ExoPlaybackException} again.
+   */
+  private ExoPlaybackException wrapTransformationException(
+      TransformationException transformationException) {
+    return ExoPlaybackException.createForRenderer(
+        transformationException,
+        "Transformer",
+        getIndex(),
+        /* rendererFormat= */ null,
+        C.FORMAT_HANDLED,
+        /* isRecoverable= */ false,
+        PlaybackException.ERROR_CODE_UNSPECIFIED);
+  }
 }