Add AudioProcessor.AudioFormat

Issue: #6601 PiperOrigin-RevId: 282515179

Add AudioProcessor.AudioFormat
Issue: #6601 PiperOrigin-RevId: 282515179
10f142b3 · andrewlewis · Oliver Woodman · b7000e64 · 10f142b3 · 10f142b3
Commit 10f142b3 authored Nov 26, 2019 by andrewlewis Committed by Oliver Woodman Nov 27, 2019
Showing with 259 additions and 329 deletions
extensions/gvr/src/main/java/com/google/android/exoplayer2/ext/gvr/GvrAudioProcessor.java
library/core/src/main/java/com/google/android/exoplayer2/audio/AudioProcessor.java
library/core/src/main/java/com/google/android/exoplayer2/audio/BaseAudioProcessor.java
library/core/src/main/java/com/google/android/exoplayer2/audio/ChannelMappingAudioProcessor.java
library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java
library/core/src/main/java/com/google/android/exoplayer2/audio/FloatResamplingAudioProcessor.java
library/core/src/main/java/com/google/android/exoplayer2/audio/ResamplingAudioProcessor.java
library/core/src/main/java/com/google/android/exoplayer2/audio/SilenceSkippingAudioProcessor.java
library/core/src/main/java/com/google/android/exoplayer2/audio/SonicAudioProcessor.java
library/core/src/main/java/com/google/android/exoplayer2/audio/TeeAudioProcessor.java
library/core/src/main/java/com/google/android/exoplayer2/audio/TrimmingAudioProcessor.java
library/core/src/test/java/com/google/android/exoplayer2/audio/SilenceSkippingAudioProcessorTest.java
library/core/src/test/java/com/google/android/exoplayer2/audio/SonicAudioProcessorTest.java
--- a/extensions/gvr/src/main/java/com/google/android/exoplayer2/ext/gvr/GvrAudioProcessor.java
+++ b/extensions/gvr/src/main/java/com/google/android/exoplayer2/ext/gvr/GvrAudioProcessor.java
@@ -18,7 +18,6 @@ package com.google.android.exoplayer2.ext.gvr;
 import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.ExoPlayerLibraryInfo;
-import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.audio.AudioProcessor;
 import com.google.android.exoplayer2.util.Assertions;
 import com.google.vr.sdk.audio.GvrAudioSurround;
@@ -44,8 +43,7 @@ public final class GvrAudioProcessor implements AudioProcessor {
  private static final int OUTPUT_FRAME_SIZE = OUTPUT_CHANNEL_COUNT * 2; // 16-bit stereo output.
  private static final int NO_SURROUND_FORMAT = GvrAudioSurround.SurroundFormat.INVALID;
-  private int sampleRateHz;
+  private AudioFormat inputAudioFormat;
-  private int channelCount;
  private int pendingGvrAudioSurroundFormat;
  @Nullable private GvrAudioSurround gvrAudioSurround;
  private ByteBuffer buffer;
@@ -60,8 +58,7 @@ public final class GvrAudioProcessor implements AudioProcessor {
  public GvrAudioProcessor() {
    // Use the identity for the initial orientation.
    w = 1f;
-    sampleRateHz = Format.NO_VALUE;
+    inputAudioFormat = AudioFormat.NOT_SET;
-    channelCount = Format.NO_VALUE;
    buffer = EMPTY_BUFFER;
    pendingGvrAudioSurroundFormat = NO_SURROUND_FORMAT;
  }
@@ -87,15 +84,13 @@ public final class GvrAudioProcessor implements AudioProcessor {
  @SuppressWarnings("ReferenceEquality")
  @Override
-  public synchronized void configure(int sampleRateHz, int channelCount, @C.Encoding int encoding)
+  public synchronized AudioFormat configure(AudioFormat inputAudioFormat)
-      throws UnhandledFormatException {
+      throws UnhandledAudioFormatException {
-    if (encoding != C.ENCODING_PCM_16BIT) {
+    if (inputAudioFormat.encoding != C.ENCODING_PCM_16BIT) {
      maybeReleaseGvrAudioSurround();
-      throw new UnhandledFormatException(sampleRateHz, channelCount, encoding);
+      throw new UnhandledAudioFormatException(inputAudioFormat);
    }
-    this.sampleRateHz = sampleRateHz;
+    switch (inputAudioFormat.channelCount) {
-    this.channelCount = channelCount;
-    switch (channelCount) {
      case 1:
        pendingGvrAudioSurroundFormat = GvrAudioSurround.SurroundFormat.SURROUND_MONO;
        break;
@@ -115,12 +110,14 @@ public final class GvrAudioProcessor implements AudioProcessor {
        pendingGvrAudioSurroundFormat = GvrAudioSurround.SurroundFormat.THIRD_ORDER_AMBISONICS;
        break;
      default:
-        throw new UnhandledFormatException(sampleRateHz, channelCount, encoding);
+        throw new UnhandledAudioFormatException(inputAudioFormat);
    }
    if (buffer == EMPTY_BUFFER) {
      buffer = ByteBuffer.allocateDirect(FRAMES_PER_OUTPUT_BUFFER * OUTPUT_FRAME_SIZE)
          .order(ByteOrder.nativeOrder());
    }
+    this.inputAudioFormat = inputAudioFormat;
+    return new AudioFormat(inputAudioFormat.sampleRate, OUTPUT_CHANNEL_COUNT, C.ENCODING_PCM_16BIT);
  }
  @Override
@@ -129,21 +126,6 @@ public final class GvrAudioProcessor implements AudioProcessor {
  }
  @Override
-  public int getOutputChannelCount() {
-    return OUTPUT_CHANNEL_COUNT;
-  }
-  @Override
-  public int getOutputEncoding() {
-    return C.ENCODING_PCM_16BIT;
-  }
-  @Override
-  public int getOutputSampleRateHz() {
-    return sampleRateHz;
-  }
-  @Override
  public void queueInput(ByteBuffer input) {
    int position = input.position();
    Assertions.checkNotNull(gvrAudioSurround);
@@ -181,7 +163,10 @@ public final class GvrAudioProcessor implements AudioProcessor {
      maybeReleaseGvrAudioSurround();
      gvrAudioSurround =
          new GvrAudioSurround(
-              pendingGvrAudioSurroundFormat, sampleRateHz, channelCount, FRAMES_PER_OUTPUT_BUFFER);
+              pendingGvrAudioSurroundFormat,
+              inputAudioFormat.sampleRate,
+              inputAudioFormat.channelCount,
+              FRAMES_PER_OUTPUT_BUFFER);
      gvrAudioSurround.updateNativeOrientation(w, x, y, z);
      pendingGvrAudioSurroundFormat = NO_SURROUND_FORMAT;
    } else if (gvrAudioSurround != null) {
@@ -195,8 +180,7 @@ public final class GvrAudioProcessor implements AudioProcessor {
    maybeReleaseGvrAudioSurround();
    updateOrientation(/* w= */ 1f, /* x= */ 0f, /* y= */ 0f, /* z= */ 0f);
    inputEnded = false;
-    sampleRateHz = Format.NO_VALUE;
+    inputAudioFormat = AudioFormat.NOT_SET;
-    channelCount = Format.NO_VALUE;
    buffer = EMPTY_BUFFER;
    pendingGvrAudioSurroundFormat = NO_SURROUND_FORMAT;
  }

--- a/library/core/src/main/java/com/google/android/exoplayer2/audio/AudioProcessor.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/audio/AudioProcessor.java
@@ -16,6 +16,8 @@
 package com.google.android.exoplayer2.audio;
 import com.google.android.exoplayer2.C;
+import com.google.android.exoplayer2.Format;
+import com.google.android.exoplayer2.util.Util;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
@@ -23,24 +25,56 @@ import java.nio.ByteOrder;
 * Interface for audio processors, which take audio data as input and transform it, potentially
 * modifying its channel count, encoding and/or sample rate.
 *
- * <p>Call {@link #configure(int, int, int)} to configure the processor to receive input audio, then
- * call {@link #isActive()} to determine whether the processor is active in the new configuration.
- * {@link #queueInput(ByteBuffer)}, {@link #getOutputChannelCount()}, {@link #getOutputEncoding()}
- * and {@link #getOutputSampleRateHz()} may only be called if the processor is active. Call {@link
- * #reset()} to reset the processor to its unconfigured state and release any resources.
- *
 * <p>In addition to being able to modify the format of audio, implementations may allow parameters
 * to be set that affect the output audio and whether the processor is active/inactive.
 */
 public interface AudioProcessor {
+  /** PCM audio format that may be handled by an audio processor. */
+  final class AudioFormat {
+    public static final AudioFormat NOT_SET =
+        new AudioFormat(
+            /* sampleRate= */ Format.NO_VALUE,
+            /* channelCount= */ Format.NO_VALUE,
+            /* encoding= */ Format.NO_VALUE);
+    /** The sample rate in Hertz. */
+    public final int sampleRate;
+    /** The number of interleaved channels. */
+    public final int channelCount;
+    /** The type of linear PCM encoding. */
+    @C.PcmEncoding public final int encoding;
+    /** The number of bytes used to represent one audio frame. */
+    public final int bytesPerFrame;
+    public AudioFormat(int sampleRate, int channelCount, @C.PcmEncoding int encoding) {
+      this.sampleRate = sampleRate;
+      this.channelCount = channelCount;
+      this.encoding = encoding;
+      bytesPerFrame =
+          Util.isEncodingLinearPcm(encoding)
+              ? Util.getPcmFrameSize(encoding, channelCount)
+              : Format.NO_VALUE;
+    }
+    @Override
+    public String toString() {
+      return "AudioFormat["
+          + "sampleRate="
+          + sampleRate
+          + ", channelCount="
+          + channelCount
+          + ", encoding="
+          + encoding
+          + ']';
+    }
+  }
  /** Exception thrown when a processor can't be configured for a given input audio format. */
-  final class UnhandledFormatException extends Exception {
+  final class UnhandledAudioFormatException extends Exception {
-    public UnhandledFormatException(
+    public UnhandledAudioFormatException(AudioFormat inputAudioFormat) {
-        int sampleRateHz, int channelCount, @C.PcmEncoding int encoding) {
+      super("Unhandled format: " + inputAudioFormat);
-      super("Unhandled format: " + sampleRateHz + " Hz, " + channelCount + " channels in encoding "
-          + encoding);
    }
  }
@@ -50,46 +84,24 @@ public interface AudioProcessor {
  /**
   * Configures the processor to process input audio with the specified format. After calling this
-   * method, call {@link #isActive()} to determine whether the audio processor is active.
+   * method, call {@link #isActive()} to determine whether the audio processor is active. Returns
-   *
+   * the configured output audio format if this instance is active.
-   * <p>If the audio processor is active after configuration, call {@link #getOutputSampleRateHz()},
-   * {@link #getOutputChannelCount()} and {@link #getOutputEncoding()} to get its new output format.
   *
   * <p>After calling this method, it is necessary to {@link #flush()} the processor to apply the
   * new configuration before queueing more data. You can (optionally) first drain output in the
   * previous configuration by calling {@link #queueEndOfStream()} and {@link #getOutput()}.
   *
-   * @param sampleRateHz The sample rate of input audio in Hz.
+   * @param inputAudioFormat The format of audio that will be queued after the next call to {@link
-   * @param channelCount The number of interleaved channels in input audio.
+   *     #flush()}.
-   * @param encoding The encoding of input audio.
+   * @return The configured output audio format if this instance is {@link #isActive() active}.
-   * @throws UnhandledFormatException Thrown if the specified format can't be handled as input.
+   * @throws UnhandledAudioFormatException Thrown if the specified format can't be handled as input.
   */
-  void configure(int sampleRateHz, int channelCount, @C.PcmEncoding int encoding)
+  AudioFormat configure(AudioFormat inputAudioFormat) throws UnhandledAudioFormatException;
-      throws UnhandledFormatException;
  /** Returns whether the processor is configured and will process input buffers. */
  boolean isActive();
  /**
-   * Returns the number of audio channels in the data output by the processor. The value may change
-   * as a result of calling {@link #configure(int, int, int)}.
-   */
-  int getOutputChannelCount();
-  /**
-   * Returns the audio encoding used in the data output by the processor. The value may change as a
-   * result of calling {@link #configure(int, int, int)}.
-   */
-  @C.PcmEncoding
-  int getOutputEncoding();
-  /**
-   * Returns the sample rate of audio output by the processor, in hertz. The value may change as a
-   * result of calling {@link #configure(int, int, int)}.
-   */
-  int getOutputSampleRateHz();
-  /**
   * Queues audio data between the position and limit of the input {@code buffer} for processing.
   * {@code buffer} must be a direct byte buffer with native byte order. Its contents are treated as
   * read-only. Its position will be advanced by the number of bytes consumed (which may be zero).
@@ -130,6 +142,6 @@ public interface AudioProcessor {
   */
  void flush();
-  /** Resets the processor to its unconfigured state. */
+  /** Resets the processor to its unconfigured state, releasing any resources. */
  void reset();
 }
--- a/library/core/src/main/java/com/google/android/exoplayer2/audio/BaseAudioProcessor.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/audio/BaseAudioProcessor.java
@@ -16,24 +16,20 @@
 package com.google.android.exoplayer2.audio;
 import androidx.annotation.CallSuper;
-import com.google.android.exoplayer2.C;
-import com.google.android.exoplayer2.Format;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 /**
 * Base class for audio processors that keep an output buffer and an internal buffer that is reused
- * whenever input is queued.
+ * whenever input is queued. Subclasses should override {@link #onConfigure(AudioFormat)} to return
+ * the output audio format for the processor if it's active.
 */
 public abstract class BaseAudioProcessor implements AudioProcessor {
-  /** The configured input sample rate, in Hertz, or {@link Format#NO_VALUE} if not configured. */
+  /** The configured input audio format. */
-  protected int sampleRateHz;
+  protected AudioFormat inputAudioFormat;
-  /** The configured input channel count, or {@link Format#NO_VALUE} if not configured. */
-  protected int channelCount;
-  /** The configured input encoding, or {@link Format#NO_VALUE} if not configured. */
-  @C.PcmEncoding protected int encoding;
+  private AudioFormat outputAudioFormat;
  private ByteBuffer buffer;
  private ByteBuffer outputBuffer;
  private boolean inputEnded;
@@ -41,29 +37,21 @@ public abstract class BaseAudioProcessor implements AudioProcessor {
  public BaseAudioProcessor() {
    buffer = EMPTY_BUFFER;
    outputBuffer = EMPTY_BUFFER;
-    channelCount = Format.NO_VALUE;
+    inputAudioFormat = AudioFormat.NOT_SET;
-    sampleRateHz = Format.NO_VALUE;
+    outputAudioFormat = AudioFormat.NOT_SET;
-    encoding = Format.NO_VALUE;
  }
  @Override
-  public boolean isActive() {
+  public final AudioFormat configure(AudioFormat inputAudioFormat)
-    return sampleRateHz != Format.NO_VALUE;
+      throws UnhandledAudioFormatException {
-  }
+    this.inputAudioFormat = inputAudioFormat;
+    outputAudioFormat = onConfigure(inputAudioFormat);
-  @Override
+    return isActive() ? outputAudioFormat : AudioFormat.NOT_SET;
-  public int getOutputChannelCount() {
-    return channelCount;
-  }
-  @Override
-  public int getOutputEncoding() {
-    return encoding;
  }
  @Override
-  public int getOutputSampleRateHz() {
+  public boolean isActive() {
-    return sampleRateHz;
+    return outputAudioFormat != AudioFormat.NOT_SET;
  }
  @Override
@@ -98,20 +86,11 @@ public abstract class BaseAudioProcessor implements AudioProcessor {
  public final void reset() {
    flush();
    buffer = EMPTY_BUFFER;
-    sampleRateHz = Format.NO_VALUE;
+    inputAudioFormat = AudioFormat.NOT_SET;
-    channelCount = Format.NO_VALUE;
+    outputAudioFormat = AudioFormat.NOT_SET;
-    encoding = Format.NO_VALUE;
    onReset();
  }
-  /** Sets the input format of this processor. */
-  protected final void setInputFormat(
-      int sampleRateHz, int channelCount, @C.PcmEncoding int encoding) {
-    this.sampleRateHz = sampleRateHz;
-    this.channelCount = channelCount;
-    this.encoding = encoding;
-  }
  /**
   * Replaces the current output buffer with a buffer of at least {@code count} bytes and returns
   * it. Callers should write to the returned buffer then {@link ByteBuffer#flip()} it so it can be
@@ -132,6 +111,12 @@ public abstract class BaseAudioProcessor implements AudioProcessor {
    return outputBuffer.hasRemaining();
  }
+  /** Called when the processor is configured for a new input format. */
+  protected AudioFormat onConfigure(AudioFormat inputAudioFormat)
+      throws UnhandledAudioFormatException {
+    return AudioFormat.NOT_SET;
+  }
  /** Called when the end-of-stream is queued to the processor. */
  protected void onQueueEndOfStream() {
    // Do nothing.

--- a/library/core/src/main/java/com/google/android/exoplayer2/audio/ChannelMappingAudioProcessor.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/audio/ChannelMappingAudioProcessor.java
@@ -24,19 +24,17 @@ import java.nio.ByteBuffer;
 * An {@link AudioProcessor} that applies a mapping from input channels onto specified output
 * channels. This can be used to reorder, duplicate or discard channels.
 */
-/* package */
 // the constructor does not initialize fields: pendingOutputChannels, outputChannels
 @SuppressWarnings("nullness:initialization.fields.uninitialized")
-final class ChannelMappingAudioProcessor extends BaseAudioProcessor {
+/* package */ final class ChannelMappingAudioProcessor extends BaseAudioProcessor {
  @Nullable private int[] pendingOutputChannels;
-  private boolean active;
  @Nullable private int[] outputChannels;
  /**
-   * Resets the channel mapping. After calling this method, call {@link #configure(int, int, int)}
+   * Resets the channel mapping. After calling this method, call {@link #configure(AudioFormat)} to
-   * to start using the new channel map.
+   * start using the new channel map.
   *
   * @param outputChannels The mapping from input to output channel indices, or {@code null} to
   *     leave the input unchanged.
@@ -47,38 +45,30 @@ final class ChannelMappingAudioProcessor extends BaseAudioProcessor {
  }
  @Override
-  public void configure(int sampleRateHz, int channelCount, @C.PcmEncoding int encoding)
+  public AudioFormat onConfigure(AudioFormat inputAudioFormat)
-      throws UnhandledFormatException {
+      throws UnhandledAudioFormatException {
    outputChannels = pendingOutputChannels;
    int[] outputChannels = this.outputChannels;
    if (outputChannels == null) {
-      active = false;
+      return AudioFormat.NOT_SET;
-      return;
    }
-    if (encoding != C.ENCODING_PCM_16BIT) {
-      throw new UnhandledFormatException(sampleRateHz, channelCount, encoding);
+    if (inputAudioFormat.encoding != C.ENCODING_PCM_16BIT) {
+      throw new UnhandledAudioFormatException(inputAudioFormat);
    }
-    setInputFormat(sampleRateHz, channelCount, encoding);
+    boolean active = inputAudioFormat.channelCount != outputChannels.length;
-    active = channelCount != outputChannels.length;
    for (int i = 0; i < outputChannels.length; i++) {
      int channelIndex = outputChannels[i];
-      if (channelIndex >= channelCount) {
+      if (channelIndex >= inputAudioFormat.channelCount) {
-        throw new UnhandledFormatException(sampleRateHz, channelCount, encoding);
+        throw new UnhandledAudioFormatException(inputAudioFormat);
      }
      active |= (channelIndex != i);
    }
-  }
+    return active
+        ? new AudioFormat(inputAudioFormat.sampleRate, outputChannels.length, C.ENCODING_PCM_16BIT)
-  @Override
+        : AudioFormat.NOT_SET;
-  public boolean isActive() {
-    return active;
-  }
-  @Override
-  public int getOutputChannelCount() {
-    return outputChannels == null ? channelCount : outputChannels.length;
  }
  @Override
@@ -86,14 +76,14 @@ final class ChannelMappingAudioProcessor extends BaseAudioProcessor {
    int[] outputChannels = Assertions.checkNotNull(this.outputChannels);
    int position = inputBuffer.position();
    int limit = inputBuffer.limit();
-    int frameCount = (limit - position) / (2 * channelCount);
+    int frameCount = (limit - position) / (2 * inputAudioFormat.channelCount);
    int outputSize = frameCount * outputChannels.length * 2;
    ByteBuffer buffer = replaceOutputBuffer(outputSize);
    while (position < limit) {
      for (int channelIndex : outputChannels) {
        buffer.putShort(inputBuffer.getShort(position + 2 * channelIndex));
      }
-      position += channelCount * 2;
+      position += inputAudioFormat.channelCount * 2;
    }
    inputBuffer.position(limit);
    buffer.flip();
@@ -103,7 +93,6 @@ final class ChannelMappingAudioProcessor extends BaseAudioProcessor {
  protected void onReset() {
    outputChannels = null;
    pendingOutputChannels = null;
-    active = false;
  }
 }
--- a/library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java
@@ -27,6 +27,7 @@ import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.PlaybackParameters;
+import com.google.android.exoplayer2.audio.AudioProcessor.UnhandledAudioFormatException;
 import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.Log;
 import com.google.android.exoplayer2.util.Util;
@@ -435,18 +436,22 @@ public final class DefaultAudioSink implements AudioSink {
    if (processingEnabled) {
      trimmingAudioProcessor.setTrimFrameCount(trimStartFrames, trimEndFrames);
      channelMappingAudioProcessor.setChannelMap(outputChannels);
+      AudioProcessor.AudioFormat inputAudioFormat =
+          new AudioProcessor.AudioFormat(sampleRate, channelCount, encoding);
+      AudioProcessor.AudioFormat outputAudioFormat = inputAudioFormat;
      for (AudioProcessor audioProcessor : availableAudioProcessors) {
        try {
-          audioProcessor.configure(sampleRate, channelCount, encoding);
+          outputAudioFormat = audioProcessor.configure(inputAudioFormat);
-        } catch (AudioProcessor.UnhandledFormatException e) {
+        } catch (UnhandledAudioFormatException e) {
          throw new ConfigurationException(e);
        }
        if (audioProcessor.isActive()) {
-          channelCount = audioProcessor.getOutputChannelCount();
+          inputAudioFormat = outputAudioFormat;
-          sampleRate = audioProcessor.getOutputSampleRateHz();
-          encoding = audioProcessor.getOutputEncoding();
        }
      }
+      sampleRate = outputAudioFormat.sampleRate;
+      channelCount = outputAudioFormat.channelCount;
+      encoding = outputAudioFormat.encoding;
    }
    int outputChannelConfig = getChannelConfig(channelCount, isInputPcm);

--- a/library/core/src/main/java/com/google/android/exoplayer2/audio/FloatResamplingAudioProcessor.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/audio/FloatResamplingAudioProcessor.java
@@ -16,6 +16,7 @@
 package com.google.android.exoplayer2.audio;
 import com.google.android.exoplayer2.C;
+import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.Util;
 import java.nio.ByteBuffer;
@@ -29,27 +30,21 @@ import java.nio.ByteBuffer;
  private static final double PCM_32_BIT_INT_TO_PCM_32_BIT_FLOAT_FACTOR = 1.0 / 0x7FFFFFFF;
  @Override
-  public void configure(int sampleRateHz, int channelCount, @C.PcmEncoding int encoding)
+  public AudioFormat onConfigure(AudioFormat inputAudioFormat)
-      throws UnhandledFormatException {
+      throws UnhandledAudioFormatException {
-    if (!Util.isEncodingHighResolutionIntegerPcm(encoding)) {
+    if (!Util.isEncodingHighResolutionIntegerPcm(inputAudioFormat.encoding)) {
-      throw new UnhandledFormatException(sampleRateHz, channelCount, encoding);
+      throw new UnhandledAudioFormatException(inputAudioFormat);
    }
-    setInputFormat(sampleRateHz, channelCount, encoding);
+    return Util.isEncodingHighResolutionIntegerPcm(inputAudioFormat.encoding)
-  }
+        ? new AudioFormat(
+            inputAudioFormat.sampleRate, inputAudioFormat.channelCount, C.ENCODING_PCM_FLOAT)
-  @Override
+        : AudioFormat.NOT_SET;
-  public boolean isActive() {
-    return Util.isEncodingHighResolutionIntegerPcm(encoding);
-  }
-  @Override
-  public int getOutputEncoding() {
-    return C.ENCODING_PCM_FLOAT;
  }
  @Override
  public void queueInput(ByteBuffer inputBuffer) {
-    boolean isInput32Bit = encoding == C.ENCODING_PCM_32BIT;
+    Assertions.checkState(Util.isEncodingHighResolutionIntegerPcm(inputAudioFormat.encoding));
+    boolean isInput32Bit = inputAudioFormat.encoding == C.ENCODING_PCM_32BIT;
    int position = inputBuffer.position();
    int limit = inputBuffer.limit();
    int size = limit - position;
@@ -65,7 +60,7 @@ import java.nio.ByteBuffer;
                | ((inputBuffer.get(i + 3) & 0xFF) << 24);
        writePcm32BitFloat(pcm32BitInteger, buffer);
      }
-    } else {
+    } else { // Input is 24-bit PCM.
      for (int i = position; i < limit; i += 3) {
        int pcm32BitInteger =
            ((inputBuffer.get(i) & 0xFF) << 8)

--- a/library/core/src/main/java/com/google/android/exoplayer2/audio/ResamplingAudioProcessor.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/audio/ResamplingAudioProcessor.java
@@ -26,23 +26,17 @@ import java.nio.ByteBuffer;
 /* package */ final class ResamplingAudioProcessor extends BaseAudioProcessor {
  @Override
-  public void configure(int sampleRateHz, int channelCount, @C.PcmEncoding int encoding)
+  public AudioFormat onConfigure(AudioFormat inputAudioFormat)
-      throws UnhandledFormatException {
+      throws UnhandledAudioFormatException {
+    @C.PcmEncoding int encoding = inputAudioFormat.encoding;
    if (encoding != C.ENCODING_PCM_8BIT && encoding != C.ENCODING_PCM_16BIT
        && encoding != C.ENCODING_PCM_24BIT && encoding != C.ENCODING_PCM_32BIT) {
-      throw new UnhandledFormatException(sampleRateHz, channelCount, encoding);
+      throw new UnhandledAudioFormatException(inputAudioFormat);
    }
-    setInputFormat(sampleRateHz, channelCount, encoding);
+    return encoding != C.ENCODING_PCM_16BIT
-  }
+        ? new AudioFormat(
+            inputAudioFormat.sampleRate, inputAudioFormat.channelCount, C.ENCODING_PCM_16BIT)
-  @Override
+        : AudioFormat.NOT_SET;
-  public boolean isActive() {
-    return encoding != C.ENCODING_INVALID && encoding != C.ENCODING_PCM_16BIT;
-  }
-  @Override
-  public int getOutputEncoding() {
-    return C.ENCODING_PCM_16BIT;
  }
  @Override
@@ -52,7 +46,7 @@ import java.nio.ByteBuffer;
    int limit = inputBuffer.limit();
    int size = limit - position;
    int resampledSize;
-    switch (encoding) {
+    switch (inputAudioFormat.encoding) {
      case C.ENCODING_PCM_8BIT:
        resampledSize = size * 2;
        break;
@@ -74,7 +68,7 @@ import java.nio.ByteBuffer;
    // Resample the little endian input and update the input/output buffers.
    ByteBuffer buffer = replaceOutputBuffer(resampledSize);
-    switch (encoding) {
+    switch (inputAudioFormat.encoding) {
      case C.ENCODING_PCM_8BIT:
        // 8->16 bit resampling. Shift each byte from [0, 256) to [-128, 128) and scale up.
        for (int i = position; i < limit; i++) {

--- a/library/core/src/main/java/com/google/android/exoplayer2/audio/SilenceSkippingAudioProcessor.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/audio/SilenceSkippingAudioProcessor.java
@@ -119,18 +119,17 @@ public final class SilenceSkippingAudioProcessor extends BaseAudioProcessor {
  // AudioProcessor implementation.
  @Override
-  public void configure(int sampleRateHz, int channelCount, @C.PcmEncoding int encoding)
+  public AudioFormat onConfigure(AudioFormat inputAudioFormat)
-      throws UnhandledFormatException {
+      throws UnhandledAudioFormatException {
-    if (encoding != C.ENCODING_PCM_16BIT) {
+    if (inputAudioFormat.encoding != C.ENCODING_PCM_16BIT) {
-      throw new UnhandledFormatException(sampleRateHz, channelCount, encoding);
+      throw new UnhandledAudioFormatException(inputAudioFormat);
    }
-    bytesPerFrame = channelCount * 2;
+    return enabled ? inputAudioFormat : AudioFormat.NOT_SET;
-    setInputFormat(sampleRateHz, channelCount, encoding);
  }
  @Override
  public boolean isActive() {
-    return super.isActive() && enabled;
+    return enabled;
  }
  @Override
@@ -165,7 +164,8 @@ public final class SilenceSkippingAudioProcessor extends BaseAudioProcessor {
  @Override
  protected void onFlush() {
-    if (isActive()) {
+    if (enabled) {
+      bytesPerFrame = inputAudioFormat.bytesPerFrame;
      int maybeSilenceBufferSize = durationUsToFrames(MINIMUM_SILENCE_DURATION_US) * bytesPerFrame;
      if (maybeSilenceBuffer.length != maybeSilenceBufferSize) {
        maybeSilenceBuffer = new byte[maybeSilenceBufferSize];
@@ -317,7 +317,7 @@ public final class SilenceSkippingAudioProcessor extends BaseAudioProcessor {
   * Returns the number of input frames corresponding to {@code durationUs} microseconds of audio.
   */
  private int durationUsToFrames(long durationUs) {
-    return (int) ((durationUs * sampleRateHz) / C.MICROS_PER_SECOND);
+    return (int) ((durationUs * inputAudioFormat.sampleRate) / C.MICROS_PER_SECOND);
  }
  /**

--- a/library/core/src/main/java/com/google/android/exoplayer2/audio/SonicAudioProcessor.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/audio/SonicAudioProcessor.java
@@ -17,7 +17,6 @@ package com.google.android.exoplayer2.audio;
 import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.C;
-import com.google.android.exoplayer2.C.Encoding;
 import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.Util;
@@ -62,12 +61,12 @@ public final class SonicAudioProcessor implements AudioProcessor {
   */
  private static final int MIN_BYTES_FOR_SPEEDUP_CALCULATION = 1024;
-  private int channelCount;
+  private int pendingOutputSampleRate;
-  private int sampleRateHz;
  private float speed;
  private float pitch;
-  private int outputSampleRateHz;
-  private int pendingOutputSampleRateHz;
+  private AudioFormat inputAudioFormat;
+  private AudioFormat outputAudioFormat;
  private boolean pendingSonicRecreation;
  @Nullable private Sonic sonic;
@@ -84,13 +83,12 @@ public final class SonicAudioProcessor implements AudioProcessor {
  public SonicAudioProcessor() {
    speed = 1f;
    pitch = 1f;
-    channelCount = Format.NO_VALUE;
+    inputAudioFormat = AudioFormat.NOT_SET;
-    sampleRateHz = Format.NO_VALUE;
+    outputAudioFormat = AudioFormat.NOT_SET;
-    outputSampleRateHz = Format.NO_VALUE;
    buffer = EMPTY_BUFFER;
    shortBuffer = buffer.asShortBuffer();
    outputBuffer = EMPTY_BUFFER;
-    pendingOutputSampleRateHz = SAMPLE_RATE_NO_CHANGE;
+    pendingOutputSampleRate = SAMPLE_RATE_NO_CHANGE;
  }
  /**
@@ -129,14 +127,14 @@ public final class SonicAudioProcessor implements AudioProcessor {
  /**
   * Sets the sample rate for output audio, in hertz. Pass {@link #SAMPLE_RATE_NO_CHANGE} to output
-   * audio at the same sample rate as the input. After calling this method, call
+   * audio at the same sample rate as the input. After calling this method, call {@link
-   * {@link #configure(int, int, int)} to start using the new sample rate.
+   * #configure(AudioFormat)} to start using the new sample rate.
   *
   * @param sampleRateHz The sample rate for output audio, in hertz.
-   * @see #configure(int, int, int)
+   * @see #configure(AudioFormat)
   */
  public void setOutputSampleRateHz(int sampleRateHz) {
-    pendingOutputSampleRateHz = sampleRateHz;
+    pendingOutputSampleRate = sampleRateHz;
  }
  /**
@@ -149,50 +147,39 @@ public final class SonicAudioProcessor implements AudioProcessor {
   */
  public long scaleDurationForSpeedup(long duration) {
    if (outputBytes >= MIN_BYTES_FOR_SPEEDUP_CALCULATION) {
-      return outputSampleRateHz == sampleRateHz
+      return outputAudioFormat.sampleRate == inputAudioFormat.sampleRate
          ? Util.scaleLargeTimestamp(duration, inputBytes, outputBytes)
-          : Util.scaleLargeTimestamp(duration, inputBytes * outputSampleRateHz,
+          : Util.scaleLargeTimestamp(
-              outputBytes * sampleRateHz);
+              duration,
+              inputBytes * outputAudioFormat.sampleRate,
+              outputBytes * inputAudioFormat.sampleRate);
    } else {
      return (long) ((double) speed * duration);
    }
  }
  @Override
-  public void configure(int sampleRateHz, int channelCount, @Encoding int encoding)
+  public AudioFormat configure(AudioFormat inputAudioFormat) throws UnhandledAudioFormatException {
-      throws UnhandledFormatException {
+    if (inputAudioFormat.encoding != C.ENCODING_PCM_16BIT) {
-    if (encoding != C.ENCODING_PCM_16BIT) {
+      throw new UnhandledAudioFormatException(inputAudioFormat);
-      throw new UnhandledFormatException(sampleRateHz, channelCount, encoding);
    }
-    int outputSampleRateHz = pendingOutputSampleRateHz == SAMPLE_RATE_NO_CHANGE
+    int outputSampleRateHz =
-        ? sampleRateHz : pendingOutputSampleRateHz;
+        pendingOutputSampleRate == SAMPLE_RATE_NO_CHANGE
-    this.sampleRateHz = sampleRateHz;
+            ? inputAudioFormat.sampleRate
-    this.channelCount = channelCount;
+            : pendingOutputSampleRate;
-    this.outputSampleRateHz = outputSampleRateHz;
+    this.inputAudioFormat = inputAudioFormat;
+    this.outputAudioFormat =
+        new AudioFormat(outputSampleRateHz, inputAudioFormat.channelCount, C.ENCODING_PCM_16BIT);
    pendingSonicRecreation = true;
+    return outputAudioFormat;
  }
  @Override
  public boolean isActive() {
-    return sampleRateHz != Format.NO_VALUE
+    return outputAudioFormat.sampleRate != Format.NO_VALUE
        && (Math.abs(speed - 1f) >= CLOSE_THRESHOLD
            || Math.abs(pitch - 1f) >= CLOSE_THRESHOLD
-            || outputSampleRateHz != sampleRateHz);
+            || outputAudioFormat.sampleRate != inputAudioFormat.sampleRate);
-  }
-  @Override
-  public int getOutputChannelCount() {
-    return channelCount;
-  }
-  @Override
-  public int getOutputEncoding() {
-    return C.ENCODING_PCM_16BIT;
-  }
-  @Override
-  public int getOutputSampleRateHz() {
-    return outputSampleRateHz;
  }
  @Override
@@ -245,7 +232,13 @@ public final class SonicAudioProcessor implements AudioProcessor {
  public void flush() {
    if (isActive()) {
      if (pendingSonicRecreation) {
-        sonic = new Sonic(sampleRateHz, channelCount, speed, pitch, outputSampleRateHz);
+        sonic =
+            new Sonic(
+                inputAudioFormat.sampleRate,
+                inputAudioFormat.channelCount,
+                speed,
+                pitch,
+                outputAudioFormat.sampleRate);
      } else if (sonic != null) {
        sonic.flush();
      }
@@ -260,13 +253,12 @@ public final class SonicAudioProcessor implements AudioProcessor {
  public void reset() {
    speed = 1f;
    pitch = 1f;
-    channelCount = Format.NO_VALUE;
+    inputAudioFormat = AudioFormat.NOT_SET;
-    sampleRateHz = Format.NO_VALUE;
+    outputAudioFormat = AudioFormat.NOT_SET;
-    outputSampleRateHz = Format.NO_VALUE;
    buffer = EMPTY_BUFFER;
    shortBuffer = buffer.asShortBuffer();
    outputBuffer = EMPTY_BUFFER;
-    pendingOutputSampleRateHz = SAMPLE_RATE_NO_CHANGE;
+    pendingOutputSampleRate = SAMPLE_RATE_NO_CHANGE;
    pendingSonicRecreation = false;
    sonic = null;
    inputBytes = 0;

--- a/library/core/src/main/java/com/google/android/exoplayer2/audio/TeeAudioProcessor.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/audio/TeeAudioProcessor.java
@@ -64,8 +64,9 @@ public final class TeeAudioProcessor extends BaseAudioProcessor {
  }
  @Override
-  public void configure(int sampleRateHz, int channelCount, @C.PcmEncoding int encoding) {
+  public AudioFormat onConfigure(AudioFormat inputAudioFormat) {
-    setInputFormat(sampleRateHz, channelCount, encoding);
+    // This processor is always active (if passed to the sink) and outputs its input.
+    return inputAudioFormat;
  }
  @Override
@@ -81,7 +82,8 @@ public final class TeeAudioProcessor extends BaseAudioProcessor {
  @Override
  protected void onFlush() {
    if (isActive()) {
-      audioBufferSink.flush(sampleRateHz, channelCount, encoding);
+      audioBufferSink.flush(
+          inputAudioFormat.sampleRate, inputAudioFormat.channelCount, inputAudioFormat.encoding);
    }
  }

--- a/library/core/src/main/java/com/google/android/exoplayer2/audio/TrimmingAudioProcessor.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/audio/TrimmingAudioProcessor.java
@@ -24,7 +24,6 @@ import java.nio.ByteBuffer;
  @C.PcmEncoding private static final int OUTPUT_ENCODING = C.ENCODING_PCM_16BIT;
-  private boolean isActive;
  private int trimStartFrames;
  private int trimEndFrames;
  private int bytesPerFrame;
@@ -42,7 +41,7 @@ import java.nio.ByteBuffer;
  /**
   * Sets the number of audio frames to trim from the start and end of audio passed to this
-   * processor. After calling this method, call {@link #configure(int, int, int)} to apply the new
+   * processor. After calling this method, call {@link #configure(AudioFormat)} to apply the new
   * trimming frame counts.
   *
   * @param trimStartFrames The number of audio frames to trim from the start of audio.
@@ -68,26 +67,20 @@ import java.nio.ByteBuffer;
  }
  @Override
-  public void configure(int sampleRateHz, int channelCount, @C.PcmEncoding int encoding)
+  public AudioFormat onConfigure(AudioFormat inputAudioFormat)
-      throws UnhandledFormatException {
+      throws UnhandledAudioFormatException {
-    if (encoding != OUTPUT_ENCODING) {
+    if (inputAudioFormat.encoding != OUTPUT_ENCODING) {
-      throw new UnhandledFormatException(sampleRateHz, channelCount, encoding);
+      throw new UnhandledAudioFormatException(inputAudioFormat);
    }
    if (endBufferSize > 0) {
      trimmedFrameCount += endBufferSize / bytesPerFrame;
    }
-    bytesPerFrame = Util.getPcmFrameSize(OUTPUT_ENCODING, channelCount);
+    bytesPerFrame = inputAudioFormat.bytesPerFrame;
    endBuffer = new byte[trimEndFrames * bytesPerFrame];
    endBufferSize = 0;
    pendingTrimStartBytes = trimStartFrames * bytesPerFrame;
-    isActive = trimStartFrames != 0 || trimEndFrames != 0;
    receivedInputSinceConfigure = false;
-    setInputFormat(sampleRateHz, channelCount, encoding);
+    return trimStartFrames != 0 || trimEndFrames != 0 ? inputAudioFormat : AudioFormat.NOT_SET;
-  }
-  @Override
-  public boolean isActive() {
-    return isActive;
  }
  @Override
@@ -140,7 +133,6 @@ import java.nio.ByteBuffer;
    buffer.flip();
  }
-  @SuppressWarnings("ReferenceEquality")
  @Override
  public ByteBuffer getOutput() {
    if (super.isEnded() && endBufferSize > 0) {
@@ -155,7 +147,6 @@ import java.nio.ByteBuffer;
    return super.getOutput();
  }
-  @SuppressWarnings("ReferenceEquality")
  @Override
  public boolean isEnded() {
    return super.isEnded() && endBufferSize == 0;

--- a/library/core/src/test/java/com/google/android/exoplayer2/audio/SilenceSkippingAudioProcessorTest.java
+++ b/library/core/src/test/java/com/google/android/exoplayer2/audio/SilenceSkippingAudioProcessorTest.java
@@ -19,6 +19,7 @@ import static com.google.common.truth.Truth.assertThat;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import com.google.android.exoplayer2.C;
+import com.google.android.exoplayer2.audio.AudioProcessor.AudioFormat;
 import com.google.android.exoplayer2.util.Assertions;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
@@ -31,8 +32,9 @@ import org.junit.runner.RunWith;
 @RunWith(AndroidJUnit4.class)
 public final class SilenceSkippingAudioProcessorTest {
-  private static final int TEST_SIGNAL_SAMPLE_RATE_HZ = 1000;
+  private static final AudioFormat AUDIO_FORMAT =
-  private static final int TEST_SIGNAL_CHANNEL_COUNT = 2;
+      new AudioFormat(
+          /* sampleRate= */ 1000, /* channelCount= */ 2, /* encoding= */ C.ENCODING_PCM_16BIT);
  private static final int TEST_SIGNAL_SILENCE_DURATION_MS = 1000;
  private static final int TEST_SIGNAL_NOISE_DURATION_MS = 1000;
  private static final int TEST_SIGNAL_FRAME_COUNT = 100000;
@@ -52,8 +54,7 @@ public final class SilenceSkippingAudioProcessorTest {
    silenceSkippingAudioProcessor.setEnabled(true);
    // When configuring it.
-    silenceSkippingAudioProcessor.configure(
+    silenceSkippingAudioProcessor.configure(AUDIO_FORMAT);
-        TEST_SIGNAL_SAMPLE_RATE_HZ, TEST_SIGNAL_CHANNEL_COUNT, C.ENCODING_PCM_16BIT);
    // It's active.
    assertThat(silenceSkippingAudioProcessor.isActive()).isTrue();
@@ -65,8 +66,7 @@ public final class SilenceSkippingAudioProcessorTest {
    silenceSkippingAudioProcessor.setEnabled(false);
    // When configuring it.
-    silenceSkippingAudioProcessor.configure(
+    silenceSkippingAudioProcessor.configure(AUDIO_FORMAT);
-        TEST_SIGNAL_SAMPLE_RATE_HZ, TEST_SIGNAL_CHANNEL_COUNT, C.ENCODING_PCM_16BIT);
    // It's not active.
    assertThat(silenceSkippingAudioProcessor.isActive()).isFalse();
@@ -76,8 +76,7 @@ public final class SilenceSkippingAudioProcessorTest {
  public void testDefaultProcessor_isNotEnabled() throws Exception {
    // Given a processor in its default state.
    // When reconfigured.
-    silenceSkippingAudioProcessor.configure(
+    silenceSkippingAudioProcessor.configure(AUDIO_FORMAT);
-        TEST_SIGNAL_SAMPLE_RATE_HZ, TEST_SIGNAL_CHANNEL_COUNT, C.ENCODING_PCM_16BIT);
    // It's not active.
    assertThat(silenceSkippingAudioProcessor.isActive()).isFalse();
@@ -88,16 +87,13 @@ public final class SilenceSkippingAudioProcessorTest {
    // Given a signal with only noise.
    InputBufferProvider inputBufferProvider =
        getInputBufferProviderForAlternatingSilenceAndNoise(
-            TEST_SIGNAL_SAMPLE_RATE_HZ,
-            TEST_SIGNAL_CHANNEL_COUNT,
            TEST_SIGNAL_SILENCE_DURATION_MS,
            /* noiseDurationMs= */ 0,
            TEST_SIGNAL_FRAME_COUNT);
    // When processing the entire signal.
    silenceSkippingAudioProcessor.setEnabled(true);
-    silenceSkippingAudioProcessor.configure(
+    silenceSkippingAudioProcessor.configure(AUDIO_FORMAT);
-        TEST_SIGNAL_SAMPLE_RATE_HZ, TEST_SIGNAL_CHANNEL_COUNT, C.ENCODING_PCM_16BIT);
    silenceSkippingAudioProcessor.flush();
    assertThat(silenceSkippingAudioProcessor.isActive()).isTrue();
    long totalOutputFrames =
@@ -113,8 +109,6 @@ public final class SilenceSkippingAudioProcessorTest {
    // Given a signal with only silence.
    InputBufferProvider inputBufferProvider =
        getInputBufferProviderForAlternatingSilenceAndNoise(
-            TEST_SIGNAL_SAMPLE_RATE_HZ,
-            TEST_SIGNAL_CHANNEL_COUNT,
            /* silenceDurationMs= */ 0,
            TEST_SIGNAL_NOISE_DURATION_MS,
            TEST_SIGNAL_FRAME_COUNT);
@@ -123,8 +117,7 @@ public final class SilenceSkippingAudioProcessorTest {
    SilenceSkippingAudioProcessor silenceSkippingAudioProcessor =
        new SilenceSkippingAudioProcessor();
    silenceSkippingAudioProcessor.setEnabled(true);
-    silenceSkippingAudioProcessor.configure(
+    silenceSkippingAudioProcessor.configure(AUDIO_FORMAT);
-        TEST_SIGNAL_SAMPLE_RATE_HZ, TEST_SIGNAL_CHANNEL_COUNT, C.ENCODING_PCM_16BIT);
    silenceSkippingAudioProcessor.flush();
    assertThat(silenceSkippingAudioProcessor.isActive()).isTrue();
    long totalOutputFrames =
@@ -141,8 +134,6 @@ public final class SilenceSkippingAudioProcessorTest {
    // Given a signal that alternates between silence and noise.
    InputBufferProvider inputBufferProvider =
        getInputBufferProviderForAlternatingSilenceAndNoise(
-            TEST_SIGNAL_SAMPLE_RATE_HZ,
-            TEST_SIGNAL_CHANNEL_COUNT,
            TEST_SIGNAL_SILENCE_DURATION_MS,
            TEST_SIGNAL_NOISE_DURATION_MS,
            TEST_SIGNAL_FRAME_COUNT);
@@ -151,8 +142,7 @@ public final class SilenceSkippingAudioProcessorTest {
    SilenceSkippingAudioProcessor silenceSkippingAudioProcessor =
        new SilenceSkippingAudioProcessor();
    silenceSkippingAudioProcessor.setEnabled(true);
-    silenceSkippingAudioProcessor.configure(
+    silenceSkippingAudioProcessor.configure(AUDIO_FORMAT);
-        TEST_SIGNAL_SAMPLE_RATE_HZ, TEST_SIGNAL_CHANNEL_COUNT, C.ENCODING_PCM_16BIT);
    silenceSkippingAudioProcessor.flush();
    assertThat(silenceSkippingAudioProcessor.isActive()).isTrue();
    long totalOutputFrames =
@@ -169,8 +159,6 @@ public final class SilenceSkippingAudioProcessorTest {
    // Given a signal that alternates between silence and noise.
    InputBufferProvider inputBufferProvider =
        getInputBufferProviderForAlternatingSilenceAndNoise(
-            TEST_SIGNAL_SAMPLE_RATE_HZ,
-            TEST_SIGNAL_CHANNEL_COUNT,
            TEST_SIGNAL_SILENCE_DURATION_MS,
            TEST_SIGNAL_NOISE_DURATION_MS,
            TEST_SIGNAL_FRAME_COUNT);
@@ -179,8 +167,7 @@ public final class SilenceSkippingAudioProcessorTest {
    SilenceSkippingAudioProcessor silenceSkippingAudioProcessor =
        new SilenceSkippingAudioProcessor();
    silenceSkippingAudioProcessor.setEnabled(true);
-    silenceSkippingAudioProcessor.configure(
+    silenceSkippingAudioProcessor.configure(AUDIO_FORMAT);
-        TEST_SIGNAL_SAMPLE_RATE_HZ, TEST_SIGNAL_CHANNEL_COUNT, C.ENCODING_PCM_16BIT);
    silenceSkippingAudioProcessor.flush();
    assertThat(silenceSkippingAudioProcessor.isActive()).isTrue();
    long totalOutputFrames =
@@ -197,8 +184,6 @@ public final class SilenceSkippingAudioProcessorTest {
    // Given a signal that alternates between silence and noise.
    InputBufferProvider inputBufferProvider =
        getInputBufferProviderForAlternatingSilenceAndNoise(
-            TEST_SIGNAL_SAMPLE_RATE_HZ,
-            TEST_SIGNAL_CHANNEL_COUNT,
            TEST_SIGNAL_SILENCE_DURATION_MS,
            TEST_SIGNAL_NOISE_DURATION_MS,
            TEST_SIGNAL_FRAME_COUNT);
@@ -207,8 +192,7 @@ public final class SilenceSkippingAudioProcessorTest {
    SilenceSkippingAudioProcessor silenceSkippingAudioProcessor =
        new SilenceSkippingAudioProcessor();
    silenceSkippingAudioProcessor.setEnabled(true);
-    silenceSkippingAudioProcessor.configure(
+    silenceSkippingAudioProcessor.configure(AUDIO_FORMAT);
-        TEST_SIGNAL_SAMPLE_RATE_HZ, TEST_SIGNAL_CHANNEL_COUNT, C.ENCODING_PCM_16BIT);
    silenceSkippingAudioProcessor.flush();
    assertThat(silenceSkippingAudioProcessor.isActive()).isTrue();
    long totalOutputFrames =
@@ -224,8 +208,6 @@ public final class SilenceSkippingAudioProcessorTest {
    // Given a signal that alternates between silence and noise.
    InputBufferProvider inputBufferProvider =
        getInputBufferProviderForAlternatingSilenceAndNoise(
-            TEST_SIGNAL_SAMPLE_RATE_HZ,
-            TEST_SIGNAL_CHANNEL_COUNT,
            TEST_SIGNAL_SILENCE_DURATION_MS,
            TEST_SIGNAL_NOISE_DURATION_MS,
            TEST_SIGNAL_FRAME_COUNT);
@@ -234,8 +216,7 @@ public final class SilenceSkippingAudioProcessorTest {
    SilenceSkippingAudioProcessor silenceSkippingAudioProcessor =
        new SilenceSkippingAudioProcessor();
    silenceSkippingAudioProcessor.setEnabled(true);
-    silenceSkippingAudioProcessor.configure(
+    silenceSkippingAudioProcessor.configure(AUDIO_FORMAT);
-        TEST_SIGNAL_SAMPLE_RATE_HZ, TEST_SIGNAL_CHANNEL_COUNT, C.ENCODING_PCM_16BIT);
    silenceSkippingAudioProcessor.flush();
    assertThat(silenceSkippingAudioProcessor.isActive()).isTrue();
    process(silenceSkippingAudioProcessor, inputBufferProvider, INPUT_BUFFER_SIZE);
@@ -253,6 +234,7 @@ public final class SilenceSkippingAudioProcessorTest {
      SilenceSkippingAudioProcessor processor,
      InputBufferProvider inputBufferProvider,
      int inputBufferSize) {
+    int bytesPerFrame = AUDIO_FORMAT.bytesPerFrame;
    processor.flush();
    long totalOutputFrames = 0;
    while (inputBufferProvider.hasRemaining()) {
@@ -260,14 +242,14 @@ public final class SilenceSkippingAudioProcessorTest {
      while (inputBuffer.hasRemaining()) {
        processor.queueInput(inputBuffer);
        ByteBuffer outputBuffer = processor.getOutput();
-        totalOutputFrames += outputBuffer.remaining() / (2 * processor.getOutputChannelCount());
+        totalOutputFrames += outputBuffer.remaining() / bytesPerFrame;
        outputBuffer.clear();
      }
    }
    processor.queueEndOfStream();
    while (!processor.isEnded()) {
      ByteBuffer outputBuffer = processor.getOutput();
-      totalOutputFrames += outputBuffer.remaining() / (2 * processor.getOutputChannelCount());
+      totalOutputFrames += outputBuffer.remaining() / bytesPerFrame;
      outputBuffer.clear();
    }
    return totalOutputFrames;
@@ -278,16 +260,16 @@ public final class SilenceSkippingAudioProcessorTest {
   * between silence/noise of the specified durations to fill {@code totalFrameCount}.
   */
  private static InputBufferProvider getInputBufferProviderForAlternatingSilenceAndNoise(
-      int sampleRateHz,
-      int channelCount,
      int silenceDurationMs,
      int noiseDurationMs,
      int totalFrameCount) {
+    int sampleRate = AUDIO_FORMAT.sampleRate;
+    int channelCount = AUDIO_FORMAT.channelCount;
    Pcm16BitAudioBuilder audioBuilder = new Pcm16BitAudioBuilder(channelCount, totalFrameCount);
    while (!audioBuilder.isFull()) {
-      int silenceDurationFrames = (silenceDurationMs * sampleRateHz) / 1000;
+      int silenceDurationFrames = (silenceDurationMs * sampleRate) / 1000;
      audioBuilder.appendFrames(/* count= */ silenceDurationFrames, /* channelLevels= */ (short) 0);
-      int noiseDurationFrames = (noiseDurationMs * sampleRateHz) / 1000;
+      int noiseDurationFrames = (noiseDurationMs * sampleRate) / 1000;
      audioBuilder.appendFrames(
          /* count= */ noiseDurationFrames, /* channelLevels= */ Short.MAX_VALUE);
    }

--- a/library/core/src/test/java/com/google/android/exoplayer2/audio/SonicAudioProcessorTest.java
+++ b/library/core/src/test/java/com/google/android/exoplayer2/audio/SonicAudioProcessorTest.java
@@ -20,6 +20,8 @@ import static org.junit.Assert.fail;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import com.google.android.exoplayer2.C;
+import com.google.android.exoplayer2.audio.AudioProcessor.AudioFormat;
+import com.google.android.exoplayer2.audio.AudioProcessor.UnhandledAudioFormatException;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -28,6 +30,16 @@ import org.junit.runner.RunWith;
 @RunWith(AndroidJUnit4.class)
 public final class SonicAudioProcessorTest {
+  private static final AudioFormat AUDIO_FORMAT_22050_HZ =
+      new AudioFormat(
+          /* sampleRate= */ 22050, /* channelCount= */ 2, /* encoding= */ C.ENCODING_PCM_16BIT);
+  private static final AudioFormat AUDIO_FORMAT_44100_HZ =
+      new AudioFormat(
+          /* sampleRate= */ 44100, /* channelCount= */ 2, /* encoding= */ C.ENCODING_PCM_16BIT);
+  private static final AudioFormat AUDIO_FORMAT_48000_HZ =
+      new AudioFormat(
+          /* sampleRate= */ 48000, /* channelCount= */ 2, /* encoding= */ C.ENCODING_PCM_16BIT);
  private SonicAudioProcessor sonicAudioProcessor;
  @Before
@@ -39,59 +51,36 @@ public final class SonicAudioProcessorTest {
  public void testReconfigureWithSameSampleRate() throws Exception {
    // When configured for resampling from 44.1 kHz to 48 kHz, the output sample rate is correct.
    sonicAudioProcessor.setOutputSampleRateHz(48000);
-    sonicAudioProcessor.configure(44100, 2, C.ENCODING_PCM_16BIT);
+    AudioFormat outputAudioFormat = sonicAudioProcessor.configure(AUDIO_FORMAT_44100_HZ);
-    assertThat(sonicAudioProcessor.getOutputSampleRateHz()).isEqualTo(48000);
    assertThat(sonicAudioProcessor.isActive()).isTrue();
+    assertThat(outputAudioFormat.sampleRate).isEqualTo(48000);
    // When reconfigured with 48 kHz input, there is no resampling.
-    sonicAudioProcessor.configure(48000, 2, C.ENCODING_PCM_16BIT);
+    outputAudioFormat = sonicAudioProcessor.configure(AUDIO_FORMAT_48000_HZ);
-    assertThat(sonicAudioProcessor.getOutputSampleRateHz()).isEqualTo(48000);
    assertThat(sonicAudioProcessor.isActive()).isFalse();
+    assertThat(outputAudioFormat.sampleRate).isEqualTo(48000);
    // When reconfigure with 44.1 kHz input, resampling is enabled again.
-    sonicAudioProcessor.configure(44100, 2, C.ENCODING_PCM_16BIT);
+    outputAudioFormat = sonicAudioProcessor.configure(AUDIO_FORMAT_44100_HZ);
-    assertThat(sonicAudioProcessor.getOutputSampleRateHz()).isEqualTo(48000);
    assertThat(sonicAudioProcessor.isActive()).isTrue();
+    assertThat(outputAudioFormat.sampleRate).isEqualTo(48000);
  }
  @Test
  public void testNoSampleRateChange() throws Exception {
    // Configure for resampling 44.1 kHz to 48 kHz.
    sonicAudioProcessor.setOutputSampleRateHz(48000);
-    sonicAudioProcessor.configure(44100, 2, C.ENCODING_PCM_16BIT);
+    sonicAudioProcessor.configure(AUDIO_FORMAT_44100_HZ);
+    assertThat(sonicAudioProcessor.isActive()).isTrue();
    // Reconfigure to not modify the sample rate.
    sonicAudioProcessor.setOutputSampleRateHz(SonicAudioProcessor.SAMPLE_RATE_NO_CHANGE);
-    sonicAudioProcessor.configure(22050, 2, C.ENCODING_PCM_16BIT);
+    sonicAudioProcessor.configure(AUDIO_FORMAT_22050_HZ);
    // The sample rate is unmodified, and the audio processor is not active.
-    assertThat(sonicAudioProcessor.getOutputSampleRateHz()).isEqualTo(22050);
-    assertThat(sonicAudioProcessor.isActive()).isFalse();
-  }
-  @Test
-  public void testBecomesActiveAfterConfigure() throws Exception {
-    sonicAudioProcessor.configure(44100, 2, C.ENCODING_PCM_16BIT);
-    // Set a new sample rate.
-    sonicAudioProcessor.setOutputSampleRateHz(22050);
-    // The new sample rate is not active yet.
    assertThat(sonicAudioProcessor.isActive()).isFalse();
-    assertThat(sonicAudioProcessor.getOutputSampleRateHz()).isEqualTo(44100);
-  }
-  @Test
-  public void testSampleRateChangeBecomesActiveAfterConfigure() throws Exception {
-    // Configure for resampling 44.1 kHz to 48 kHz.
-    sonicAudioProcessor.setOutputSampleRateHz(48000);
-    sonicAudioProcessor.configure(44100, 2, C.ENCODING_PCM_16BIT);
-    // Set a new sample rate, which isn't active yet.
-    sonicAudioProcessor.setOutputSampleRateHz(22050);
-    assertThat(sonicAudioProcessor.getOutputSampleRateHz()).isEqualTo(48000);
-    // The new sample rate takes effect on reconfiguration.
-    sonicAudioProcessor.configure(44100, 2, C.ENCODING_PCM_16BIT);
-    assertThat(sonicAudioProcessor.getOutputSampleRateHz()).isEqualTo(22050);
  }
  @Test
  public void testIsActiveWithSpeedChange() throws Exception {
    sonicAudioProcessor.setSpeed(1.5f);
-    sonicAudioProcessor.configure(44100, 2, C.ENCODING_PCM_16BIT);
+    sonicAudioProcessor.configure(AUDIO_FORMAT_44100_HZ);
    sonicAudioProcessor.flush();
    assertThat(sonicAudioProcessor.isActive()).isTrue();
  }
@@ -99,35 +88,45 @@ public final class SonicAudioProcessorTest {
  @Test
  public void testIsActiveWithPitchChange() throws Exception {
    sonicAudioProcessor.setPitch(1.5f);
-    sonicAudioProcessor.configure(44100, 2, C.ENCODING_PCM_16BIT);
+    sonicAudioProcessor.configure(AUDIO_FORMAT_44100_HZ);
    sonicAudioProcessor.flush();
    assertThat(sonicAudioProcessor.isActive()).isTrue();
  }
  @Test
  public void testIsNotActiveWithNoChange() throws Exception {
-    sonicAudioProcessor.configure(44100, 2, C.ENCODING_PCM_16BIT);
+    sonicAudioProcessor.configure(AUDIO_FORMAT_44100_HZ);
    assertThat(sonicAudioProcessor.isActive()).isFalse();
  }
  @Test
  public void testDoesNotSupportNon16BitInput() throws Exception {
    try {
-      sonicAudioProcessor.configure(44100, 2, C.ENCODING_PCM_8BIT);
+      sonicAudioProcessor.configure(
+          new AudioFormat(
+              /* sampleRate= */ 44100, /* channelCount= */ 2, /* encoding= */ C.ENCODING_PCM_8BIT));
      fail();
-    } catch (AudioProcessor.UnhandledFormatException e) {
+    } catch (UnhandledAudioFormatException e) {
      // Expected.
    }
    try {
-      sonicAudioProcessor.configure(44100, 2, C.ENCODING_PCM_24BIT);
+      sonicAudioProcessor.configure(
+          new AudioFormat(
+              /* sampleRate= */ 44100,
+              /* channelCount= */ 2,
+              /* encoding= */ C.ENCODING_PCM_24BIT));
      fail();
-    } catch (AudioProcessor.UnhandledFormatException e) {
+    } catch (UnhandledAudioFormatException e) {
      // Expected.
    }
    try {
-      sonicAudioProcessor.configure(44100, 2, C.ENCODING_PCM_32BIT);
+      sonicAudioProcessor.configure(
+          new AudioFormat(
+              /* sampleRate= */ 44100,
+              /* channelCount= */ 2,
+              /* encoding= */ C.ENCODING_PCM_32BIT));
      fail();
-    } catch (AudioProcessor.UnhandledFormatException e) {
+    } catch (UnhandledAudioFormatException e) {
      // Expected.
    }
  }