/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package androidx.media3.exoplayer.mediacodec;

import static androidx.media3.exoplayer.DecoderReuseEvaluation.DISCARD_REASON_AUDIO_CHANNEL_COUNT_CHANGED;
import static androidx.media3.exoplayer.DecoderReuseEvaluation.DISCARD_REASON_AUDIO_ENCODING_CHANGED;
import static androidx.media3.exoplayer.DecoderReuseEvaluation.DISCARD_REASON_AUDIO_SAMPLE_RATE_CHANGED;
import static androidx.media3.exoplayer.DecoderReuseEvaluation.DISCARD_REASON_INITIALIZATION_DATA_CHANGED;
import static androidx.media3.exoplayer.DecoderReuseEvaluation.DISCARD_REASON_MIME_TYPE_CHANGED;
import static androidx.media3.exoplayer.DecoderReuseEvaluation.DISCARD_REASON_VIDEO_COLOR_INFO_CHANGED;
import static androidx.media3.exoplayer.DecoderReuseEvaluation.DISCARD_REASON_VIDEO_RESOLUTION_CHANGED;
import static androidx.media3.exoplayer.DecoderReuseEvaluation.DISCARD_REASON_VIDEO_ROTATION_CHANGED;
import static androidx.media3.exoplayer.DecoderReuseEvaluation.DISCARD_REASON_WORKAROUND;
import static androidx.media3.exoplayer.DecoderReuseEvaluation.REUSE_RESULT_NO;
import static androidx.media3.exoplayer.DecoderReuseEvaluation.REUSE_RESULT_YES_WITHOUT_RECONFIGURATION;
import static androidx.media3.exoplayer.DecoderReuseEvaluation.REUSE_RESULT_YES_WITH_FLUSH;
import static androidx.media3.exoplayer.DecoderReuseEvaluation.REUSE_RESULT_YES_WITH_RECONFIGURATION;

import android.graphics.Point;
import android.media.MediaCodec;
import android.media.MediaCodecInfo.AudioCapabilities;
import android.media.MediaCodecInfo.CodecCapabilities;
import android.media.MediaCodecInfo.CodecProfileLevel;
import android.media.MediaCodecInfo.VideoCapabilities;
import android.util.Pair;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import androidx.annotation.VisibleForTesting;
import androidx.media3.common.Format;
import androidx.media3.common.MimeTypes;
import androidx.media3.common.util.Assertions;
import androidx.media3.common.util.Log;
import androidx.media3.common.util.UnstableApi;
import androidx.media3.common.util.Util;
import androidx.media3.exoplayer.DecoderReuseEvaluation;
import androidx.media3.exoplayer.DecoderReuseEvaluation.DecoderDiscardReasons;
import androidx.media3.exoplayer.DecoderReuseEvaluation.DecoderReuseResult;

/** Information about a {@link MediaCodec} for a given mime type. */
@SuppressWarnings("InlinedApi")
@UnstableApi
public final class MediaCodecInfo {

  public static final String TAG = "MediaCodecInfo";

  /**
   * The value returned by {@link #getMaxSupportedInstances()} if the upper bound on the maximum
   * number of supported instances is unknown.
   */
  public static final int MAX_SUPPORTED_INSTANCES_UNKNOWN = -1;

  /**
   * The name of the decoder.
   *
   * <p>May be passed to {@link MediaCodec#createByCodecName(String)} to create an instance of the
   * decoder.
   */
  public final String name;

  /** The MIME type handled by the codec. */
  public final String mimeType;

  /**
   * The MIME type that the codec uses for media of type {@link #mimeType}. Equal to {@link
   * #mimeType} unless the codec is known to use a non-standard MIME type alias.
   */
  public final String codecMimeType;

  /**
   * The capabilities of the decoder, like the profiles/levels it supports, or {@code null} if not
   * known.
   */
  @Nullable public final CodecCapabilities capabilities;

  /**
   * Whether the decoder supports seamless resolution switches.
   *
   * @see CodecCapabilities#isFeatureSupported(String)
   * @see CodecCapabilities#FEATURE_AdaptivePlayback
   */
  public final boolean adaptive;

  /**
   * Whether the decoder supports tunneling.
   *
   * @see CodecCapabilities#isFeatureSupported(String)
   * @see CodecCapabilities#FEATURE_TunneledPlayback
   */
  public final boolean tunneling;

  /**
   * Whether the decoder is secure.
   *
   * @see CodecCapabilities#isFeatureSupported(String)
   * @see CodecCapabilities#FEATURE_SecurePlayback
   */
  public final boolean secure;

  /**
   * Whether the codec is hardware accelerated.
   *
   * <p>This could be an approximation as the exact information is only provided in API levels 29+.
   *
   * @see android.media.MediaCodecInfo#isHardwareAccelerated()
   */
  public final boolean hardwareAccelerated;

  /**
   * Whether the codec is software only.
   *
   * <p>This could be an approximation as the exact information is only provided in API levels 29+.
   *
   * @see android.media.MediaCodecInfo#isSoftwareOnly()
   */
  public final boolean softwareOnly;

  /**
   * Whether the codec is from the vendor.
   *
   * <p>This could be an approximation as the exact information is only provided in API levels 29+.
   *
   * @see android.media.MediaCodecInfo#isVendor()
   */
  public final boolean vendor;

  private final boolean isVideo;

  /**
   * Creates an instance.
   *
   * @param name The name of the {@link MediaCodec}.
   * @param mimeType A mime type supported by the {@link MediaCodec}.
   * @param codecMimeType The MIME type that the codec uses for media of type {@code #mimeType}.
   *     Equal to {@code mimeType} unless the codec is known to use a non-standard MIME type alias.
   * @param capabilities The capabilities of the {@link MediaCodec} for the specified mime type, or
   *     {@code null} if not known.
   * @param hardwareAccelerated Whether the {@link MediaCodec} is hardware accelerated.
   * @param softwareOnly Whether the {@link MediaCodec} is software only.
   * @param vendor Whether the {@link MediaCodec} is provided by the vendor.
   * @param forceDisableAdaptive Whether {@link #adaptive} should be forced to {@code false}.
   * @param forceSecure Whether {@link #secure} should be forced to {@code true}.
   * @return The created instance.
   */
  public static MediaCodecInfo newInstance(
      String name,
      String mimeType,
      String codecMimeType,
      @Nullable CodecCapabilities capabilities,
      boolean hardwareAccelerated,
      boolean softwareOnly,
      boolean vendor,
      boolean forceDisableAdaptive,
      boolean forceSecure) {
    return new MediaCodecInfo(
        name,
        mimeType,
        codecMimeType,
        capabilities,
        hardwareAccelerated,
        softwareOnly,
        vendor,
        /* adaptive= */ !forceDisableAdaptive
            && capabilities != null
            && isAdaptive(capabilities)
            && !needsDisableAdaptationWorkaround(name),
        /* tunneling= */ capabilities != null && isTunneling(capabilities),
        /* secure= */ forceSecure || (capabilities != null && isSecure(capabilities)));
  }

  @VisibleForTesting
  /* package */ MediaCodecInfo(
      String name,
      String mimeType,
      String codecMimeType,
      @Nullable CodecCapabilities capabilities,
      boolean hardwareAccelerated,
      boolean softwareOnly,
      boolean vendor,
      boolean adaptive,
      boolean tunneling,
      boolean secure) {
    this.name = Assertions.checkNotNull(name);
    this.mimeType = mimeType;
    this.codecMimeType = codecMimeType;
    this.capabilities = capabilities;
    this.hardwareAccelerated = hardwareAccelerated;
    this.softwareOnly = softwareOnly;
    this.vendor = vendor;
    this.adaptive = adaptive;
    this.tunneling = tunneling;
    this.secure = secure;
    isVideo = MimeTypes.isVideo(mimeType);
  }

  @Override
  public String toString() {
    return name;
  }

  /**
   * The profile levels supported by the decoder.
   *
   * @return The profile levels supported by the decoder.
   */
  public CodecProfileLevel[] getProfileLevels() {
    return capabilities == null || capabilities.profileLevels == null
        ? new CodecProfileLevel[0]
        : capabilities.profileLevels;
  }

  /**
   * Returns an upper bound on the maximum number of supported instances, or {@link
   * #MAX_SUPPORTED_INSTANCES_UNKNOWN} if unknown. Applications should not expect to operate more
   * instances than the returned maximum.
   *
   * @see CodecCapabilities#getMaxSupportedInstances()
   */
  public int getMaxSupportedInstances() {
    if (Util.SDK_INT < 23 || capabilities == null) {
      return MAX_SUPPORTED_INSTANCES_UNKNOWN;
    }
    return getMaxSupportedInstancesV23(capabilities);
  }

  /**
   * Returns whether the decoder may support decoding the given {@code format}.
   *
   * @param format The input media format.
   * @return Whether the decoder may support decoding the given {@code format}.
   * @throws MediaCodecUtil.DecoderQueryException Thrown if an error occurs while querying decoders.
   */
  public boolean isFormatSupported(Format format) throws MediaCodecUtil.DecoderQueryException {
    if (!isSampleMimeTypeSupported(format)) {
      return false;
    }

    if (!isCodecProfileAndLevelSupported(format)) {
      return false;
    }

    if (isVideo) {
      if (format.width <= 0 || format.height <= 0) {
        return true;
      }
      if (Util.SDK_INT >= 21) {
        return isVideoSizeAndRateSupportedV21(format.width, format.height, format.frameRate);
      } else {
        boolean isFormatSupported =
            format.width * format.height <= MediaCodecUtil.maxH264DecodableFrameSize();
        if (!isFormatSupported) {
          logNoSupport("legacyFrameSize, " + format.width + "x" + format.height);
        }
        return isFormatSupported;
      }
    } else { // Audio
      return Util.SDK_INT < 21
          || ((format.sampleRate == Format.NO_VALUE
                  || isAudioSampleRateSupportedV21(format.sampleRate))
              && (format.channelCount == Format.NO_VALUE
                  || isAudioChannelCountSupportedV21(format.channelCount)));
    }
  }

  private boolean isSampleMimeTypeSupported(Format format) {
    return mimeType.equals(format.sampleMimeType)
        || mimeType.equals(MediaCodecUtil.getAlternativeCodecMimeType(format));
  }

  private boolean isCodecProfileAndLevelSupported(Format format) {
    if (format.codecs == null) {
      return true;
    }
    Pair<Integer, Integer> codecProfileAndLevel = MediaCodecUtil.getCodecProfileAndLevel(format);
    if (codecProfileAndLevel == null) {
      // If we don't know any better, we assume that the profile and level are supported.
      return true;
    }
    int profile = codecProfileAndLevel.first;
    int level = codecProfileAndLevel.second;
    if (MimeTypes.VIDEO_DOLBY_VISION.equals(format.sampleMimeType)) {
      // If this codec is H264 or H265, we only support the Dolby Vision base layer and need to map
      // the Dolby Vision profile to the corresponding base layer profile. Also assume all levels of
      // this base layer profile are supported.
      if (MimeTypes.VIDEO_H264.equals(mimeType)) {
        profile = CodecProfileLevel.AVCProfileHigh;
        level = 0;
      } else if (MimeTypes.VIDEO_H265.equals(mimeType)) {
        profile = CodecProfileLevel.HEVCProfileMain10;
        level = 0;
      }
    }

    if (!isVideo && profile != CodecProfileLevel.AACObjectXHE) {
      // Some devices/builds underreport audio capabilities, so assume support except for xHE-AAC
      // which may not be widely supported. See https://github.com/google/ExoPlayer/issues/5145.
      return true;
    }

    CodecProfileLevel[] profileLevels = getProfileLevels();
    if (Util.SDK_INT <= 23 && MimeTypes.VIDEO_VP9.equals(mimeType) && profileLevels.length == 0) {
      // Some older devices don't report profile levels for VP9. Estimate them using other data in
      // the codec capabilities.
      profileLevels = estimateLegacyVp9ProfileLevels(capabilities);
    }

    for (CodecProfileLevel profileLevel : profileLevels) {
      if (profileLevel.profile == profile
          && profileLevel.level >= level
          && !needsProfileExcludedWorkaround(mimeType, profile)) {
        return true;
      }
    }
    logNoSupport("codec.profileLevel, " + format.codecs + ", " + codecMimeType);
    return false;
  }

  /** Whether the codec handles HDR10+ out-of-band metadata. */
  public boolean isHdr10PlusOutOfBandMetadataSupported() {
    if (Util.SDK_INT >= 29 && MimeTypes.VIDEO_VP9.equals(mimeType)) {
      for (CodecProfileLevel capabilities : getProfileLevels()) {
        if (capabilities.profile == CodecProfileLevel.VP9Profile2HDR10Plus) {
          return true;
        }
      }
    }
    return false;
  }

  /**
   * Returns whether it may be possible to adapt an instance of this decoder to playing a different
   * format when the codec is configured to play media in the specified {@code format}.
   *
   * <p>For adaptation to succeed, the codec must also be configured with appropriate maximum values
   * and {@link #isSeamlessAdaptationSupported(Format, Format, boolean)} must return {@code true}
   * for the old/new formats.
   *
   * @param format The format of media for which the decoder will be configured.
   * @return Whether adaptation may be possible
   */
  public boolean isSeamlessAdaptationSupported(Format format) {
    if (isVideo) {
      return adaptive;
    } else {
      Pair<Integer, Integer> profileLevel = MediaCodecUtil.getCodecProfileAndLevel(format);
      return profileLevel != null && profileLevel.first == CodecProfileLevel.AACObjectXHE;
    }
  }

  /**
   * Returns whether it is possible to adapt an instance of this decoder seamlessly from {@code
   * oldFormat} to {@code newFormat}. If {@code newFormat} may not be completely populated, pass
   * {@code false} for {@code isNewFormatComplete}.
   *
   * <p>For adaptation to succeed, the codec must also be configured with maximum values that are
   * compatible with the new format.
   *
   * @param oldFormat The format being decoded.
   * @param newFormat The new format.
   * @param isNewFormatComplete Whether {@code newFormat} is populated with format-specific
   *     metadata.
   * @return Whether it is possible to adapt the decoder seamlessly.
   * @deprecated Use {@link #canReuseCodec}.
   */
  @Deprecated
  public boolean isSeamlessAdaptationSupported(
      Format oldFormat, Format newFormat, boolean isNewFormatComplete) {
    if (!isNewFormatComplete && oldFormat.colorInfo != null && newFormat.colorInfo == null) {
      newFormat = newFormat.buildUpon().setColorInfo(oldFormat.colorInfo).build();
    }
    @DecoderReuseResult int reuseResult = canReuseCodec(oldFormat, newFormat).result;
    return reuseResult == REUSE_RESULT_YES_WITH_RECONFIGURATION
        || reuseResult == REUSE_RESULT_YES_WITHOUT_RECONFIGURATION;
  }

  /**
   * Evaluates whether it's possible to reuse an instance of this decoder that's currently decoding
   * {@code oldFormat} to decode {@code newFormat} instead.
   *
   * <p>For adaptation to succeed, the codec must also be configured with maximum values that are
   * compatible with the new format.
   *
   * @param oldFormat The format being decoded.
   * @param newFormat The new format.
   * @return The result of the evaluation.
   */
  public DecoderReuseEvaluation canReuseCodec(Format oldFormat, Format newFormat) {
    @DecoderDiscardReasons int discardReasons = 0;
    if (!Util.areEqual(oldFormat.sampleMimeType, newFormat.sampleMimeType)) {
      discardReasons |= DISCARD_REASON_MIME_TYPE_CHANGED;
    }

    if (isVideo) {
      if (oldFormat.rotationDegrees != newFormat.rotationDegrees) {
        discardReasons |= DISCARD_REASON_VIDEO_ROTATION_CHANGED;
      }
      if (!adaptive
          && (oldFormat.width != newFormat.width || oldFormat.height != newFormat.height)) {
        discardReasons |= DISCARD_REASON_VIDEO_RESOLUTION_CHANGED;
      }
      if (!Util.areEqual(oldFormat.colorInfo, newFormat.colorInfo)) {
        discardReasons |= DISCARD_REASON_VIDEO_COLOR_INFO_CHANGED;
      }
      if (needsAdaptationReconfigureWorkaround(name)
          && !oldFormat.initializationDataEquals(newFormat)) {
        discardReasons |= DISCARD_REASON_WORKAROUND;
      }

      if (discardReasons == 0) {
        return new DecoderReuseEvaluation(
            name,
            oldFormat,
            newFormat,
            oldFormat.initializationDataEquals(newFormat)
                ? REUSE_RESULT_YES_WITHOUT_RECONFIGURATION
                : REUSE_RESULT_YES_WITH_RECONFIGURATION,
            /* discardReasons= */ 0);
      }
    } else {
      if (oldFormat.channelCount != newFormat.channelCount) {
        discardReasons |= DISCARD_REASON_AUDIO_CHANNEL_COUNT_CHANGED;
      }
      if (oldFormat.sampleRate != newFormat.sampleRate) {
        discardReasons |= DISCARD_REASON_AUDIO_SAMPLE_RATE_CHANGED;
      }
      if (oldFormat.pcmEncoding != newFormat.pcmEncoding) {
        discardReasons |= DISCARD_REASON_AUDIO_ENCODING_CHANGED;
      }

      // Check whether we're adapting between two xHE-AAC formats, for which adaptation is possible
      // without reconfiguration or flushing.
      if (discardReasons == 0 && MimeTypes.AUDIO_AAC.equals(mimeType)) {
        @Nullable
        Pair<Integer, Integer> oldCodecProfileLevel =
            MediaCodecUtil.getCodecProfileAndLevel(oldFormat);
        @Nullable
        Pair<Integer, Integer> newCodecProfileLevel =
            MediaCodecUtil.getCodecProfileAndLevel(newFormat);
        if (oldCodecProfileLevel != null && newCodecProfileLevel != null) {
          int oldProfile = oldCodecProfileLevel.first;
          int newProfile = newCodecProfileLevel.first;
          if (oldProfile == CodecProfileLevel.AACObjectXHE
              && newProfile == CodecProfileLevel.AACObjectXHE) {
            return new DecoderReuseEvaluation(
                name,
                oldFormat,
                newFormat,
                REUSE_RESULT_YES_WITHOUT_RECONFIGURATION,
                /* discardReasons= */ 0);
          }
        }
      }

      if (!oldFormat.initializationDataEquals(newFormat)) {
        discardReasons |= DISCARD_REASON_INITIALIZATION_DATA_CHANGED;
      }
      if (needsAdaptationFlushWorkaround(mimeType)) {
        discardReasons |= DISCARD_REASON_WORKAROUND;
      }

      if (discardReasons == 0) {
        return new DecoderReuseEvaluation(
            name, oldFormat, newFormat, REUSE_RESULT_YES_WITH_FLUSH, /* discardReasons= */ 0);
      }
    }

    return new DecoderReuseEvaluation(name, oldFormat, newFormat, REUSE_RESULT_NO, discardReasons);
  }

  /**
   * Whether the decoder supports video with a given width, height and frame rate.
   *
   * <p>Must not be called if the device SDK version is less than 21.
   *
   * @param width Width in pixels.
   * @param height Height in pixels.
   * @param frameRate Optional frame rate in frames per second. Ignored if set to {@link
   *     Format#NO_VALUE} or any value less than or equal to 0.
   * @return Whether the decoder supports video with the given width, height and frame rate.
   */
  @RequiresApi(21)
  public boolean isVideoSizeAndRateSupportedV21(int width, int height, double frameRate) {
    if (capabilities == null) {
      logNoSupport("sizeAndRate.caps");
      return false;
    }
    VideoCapabilities videoCapabilities = capabilities.getVideoCapabilities();
    if (videoCapabilities == null) {
      logNoSupport("sizeAndRate.vCaps");
      return false;
    }
    if (!areSizeAndRateSupportedV21(videoCapabilities, width, height, frameRate)) {
      if (width >= height
          || !needsRotatedVerticalResolutionWorkaround(name)
          || !areSizeAndRateSupportedV21(videoCapabilities, height, width, frameRate)) {
        logNoSupport("sizeAndRate.support, " + width + "x" + height + "x" + frameRate);
        return false;
      }
      logAssumedSupport("sizeAndRate.rotated, " + width + "x" + height + "x" + frameRate);
    }
    return true;
  }

  /**
   * Returns the smallest video size greater than or equal to a specified size that also satisfies
   * the {@link MediaCodec}'s width and height alignment requirements.
   *
   * <p>Must not be called if the device SDK version is less than 21.
   *
   * @param width Width in pixels.
   * @param height Height in pixels.
   * @return The smallest video size greater than or equal to the specified size that also satisfies
   *     the {@link MediaCodec}'s width and height alignment requirements, or null if not a video
   *     codec.
   */
  @Nullable
  @RequiresApi(21)
  public Point alignVideoSizeV21(int width, int height) {
    if (capabilities == null) {
      return null;
    }
    VideoCapabilities videoCapabilities = capabilities.getVideoCapabilities();
    if (videoCapabilities == null) {
      return null;
    }
    return alignVideoSizeV21(videoCapabilities, width, height);
  }

  /**
   * Whether the decoder supports audio with a given sample rate.
   *
   * <p>Must not be called if the device SDK version is less than 21.
   *
   * @param sampleRate The sample rate in Hz.
   * @return Whether the decoder supports audio with the given sample rate.
   */
  @RequiresApi(21)
  public boolean isAudioSampleRateSupportedV21(int sampleRate) {
    if (capabilities == null) {
      logNoSupport("sampleRate.caps");
      return false;
    }
    AudioCapabilities audioCapabilities = capabilities.getAudioCapabilities();
    if (audioCapabilities == null) {
      logNoSupport("sampleRate.aCaps");
      return false;
    }
    if (!audioCapabilities.isSampleRateSupported(sampleRate)) {
      logNoSupport("sampleRate.support, " + sampleRate);
      return false;
    }
    return true;
  }

  /**
   * Whether the decoder supports audio with a given channel count.
   *
   * <p>Must not be called if the device SDK version is less than 21.
   *
   * @param channelCount The channel count.
   * @return Whether the decoder supports audio with the given channel count.
   */
  @RequiresApi(21)
  public boolean isAudioChannelCountSupportedV21(int channelCount) {
    if (capabilities == null) {
      logNoSupport("channelCount.caps");
      return false;
    }
    AudioCapabilities audioCapabilities = capabilities.getAudioCapabilities();
    if (audioCapabilities == null) {
      logNoSupport("channelCount.aCaps");
      return false;
    }
    int maxInputChannelCount =
        adjustMaxInputChannelCount(name, mimeType, audioCapabilities.getMaxInputChannelCount());
    if (maxInputChannelCount < channelCount) {
      logNoSupport("channelCount.support, " + channelCount);
      return false;
    }
    return true;
  }

  private void logNoSupport(String message) {
    Log.d(
        TAG,
        "NoSupport ["
            + message
            + "] ["
            + name
            + ", "
            + mimeType
            + "] ["
            + Util.DEVICE_DEBUG_INFO
            + "]");
  }

  private void logAssumedSupport(String message) {
    Log.d(
        TAG,
        "AssumedSupport ["
            + message
            + "] ["
            + name
            + ", "
            + mimeType
            + "] ["
            + Util.DEVICE_DEBUG_INFO
            + "]");
  }

  private static int adjustMaxInputChannelCount(String name, String mimeType, int maxChannelCount) {
    if (maxChannelCount > 1 || (Util.SDK_INT >= 26 && maxChannelCount > 0)) {
      // The maximum channel count looks like it's been set correctly.
      return maxChannelCount;
    }
    if (MimeTypes.AUDIO_MPEG.equals(mimeType)
        || MimeTypes.AUDIO_AMR_NB.equals(mimeType)
        || MimeTypes.AUDIO_AMR_WB.equals(mimeType)
        || MimeTypes.AUDIO_AAC.equals(mimeType)
        || MimeTypes.AUDIO_VORBIS.equals(mimeType)
        || MimeTypes.AUDIO_OPUS.equals(mimeType)
        || MimeTypes.AUDIO_RAW.equals(mimeType)
        || MimeTypes.AUDIO_FLAC.equals(mimeType)
        || MimeTypes.AUDIO_ALAW.equals(mimeType)
        || MimeTypes.AUDIO_MLAW.equals(mimeType)
        || MimeTypes.AUDIO_MSGSM.equals(mimeType)) {
      // Platform code should have set a default.
      return maxChannelCount;
    }
    // The maximum channel count looks incorrect. Adjust it to an assumed default.
    int assumedMaxChannelCount;
    if (MimeTypes.AUDIO_AC3.equals(mimeType)) {
      assumedMaxChannelCount = 6;
    } else if (MimeTypes.AUDIO_E_AC3.equals(mimeType)) {
      assumedMaxChannelCount = 16;
    } else {
      // Default to the platform limit, which is 30.
      assumedMaxChannelCount = 30;
    }
    Log.w(
        TAG,
        "AssumedMaxChannelAdjustment: "
            + name
            + ", ["
            + maxChannelCount
            + " to "
            + assumedMaxChannelCount
            + "]");
    return assumedMaxChannelCount;
  }

  private static boolean isAdaptive(CodecCapabilities capabilities) {
    return Util.SDK_INT >= 19 && isAdaptiveV19(capabilities);
  }

  @RequiresApi(19)
  private static boolean isAdaptiveV19(CodecCapabilities capabilities) {
    return capabilities.isFeatureSupported(CodecCapabilities.FEATURE_AdaptivePlayback);
  }

  private static boolean isTunneling(CodecCapabilities capabilities) {
    return Util.SDK_INT >= 21 && isTunnelingV21(capabilities);
  }

  @RequiresApi(21)
  private static boolean isTunnelingV21(CodecCapabilities capabilities) {
    return capabilities.isFeatureSupported(CodecCapabilities.FEATURE_TunneledPlayback);
  }

  private static boolean isSecure(CodecCapabilities capabilities) {
    return Util.SDK_INT >= 21 && isSecureV21(capabilities);
  }

  @RequiresApi(21)
  private static boolean isSecureV21(CodecCapabilities capabilities) {
    return capabilities.isFeatureSupported(CodecCapabilities.FEATURE_SecurePlayback);
  }

  @RequiresApi(21)
  private static boolean areSizeAndRateSupportedV21(
      VideoCapabilities capabilities, int width, int height, double frameRate) {
    // Don't ever fail due to alignment. See: https://github.com/google/ExoPlayer/issues/6551.
    Point alignedSize = alignVideoSizeV21(capabilities, width, height);
    width = alignedSize.x;
    height = alignedSize.y;

    // VideoCapabilities.areSizeAndRateSupported incorrectly returns false if frameRate < 1 on some
    // versions of Android, so we only check the size in this case [Internal ref: b/153940404].
    if (frameRate == Format.NO_VALUE || frameRate < 1) {
      return capabilities.isSizeSupported(width, height);
    } else {
      // The signaled frame rate may be slightly higher than the actual frame rate, so we take the
      // floor to avoid situations where a range check in areSizeAndRateSupported fails due to
      // slightly exceeding the limits for a standard format (e.g., 1080p at 30 fps).
      double floorFrameRate = Math.floor(frameRate);
      return capabilities.areSizeAndRateSupported(width, height, floorFrameRate);
    }
  }

  @RequiresApi(21)
  private static Point alignVideoSizeV21(VideoCapabilities capabilities, int width, int height) {
    int widthAlignment = capabilities.getWidthAlignment();
    int heightAlignment = capabilities.getHeightAlignment();
    return new Point(
        Util.ceilDivide(width, widthAlignment) * widthAlignment,
        Util.ceilDivide(height, heightAlignment) * heightAlignment);
  }

  @RequiresApi(23)
  private static int getMaxSupportedInstancesV23(CodecCapabilities capabilities) {
    return capabilities.getMaxSupportedInstances();
  }

  /**
   * Called on devices with {@link Util#SDK_INT} 23 and below, for VP9 decoders whose {@link
   * CodecCapabilities} do not correctly report profile levels. The returned {@link
   * CodecProfileLevel CodecProfileLevels} are estimated based on other data in the {@link
   * CodecCapabilities}.
   *
   * @param capabilities The {@link CodecCapabilities} for a VP9 decoder, or {@code null} if not
   *     known.
   * @return The estimated {@link CodecProfileLevel CodecProfileLevels} for the decoder.
   */
  private static CodecProfileLevel[] estimateLegacyVp9ProfileLevels(
      @Nullable CodecCapabilities capabilities) {
    int maxBitrate = 0;
    if (capabilities != null) {
      @Nullable VideoCapabilities videoCapabilities = capabilities.getVideoCapabilities();
      if (videoCapabilities != null) {
        maxBitrate = videoCapabilities.getBitrateRange().getUpper();
      }
    }

    // Values taken from https://www.webmproject.org/vp9/levels.
    int level;
    if (maxBitrate >= 180_000_000) {
      level = CodecProfileLevel.VP9Level52;
    } else if (maxBitrate >= 120_000_000) {
      level = CodecProfileLevel.VP9Level51;
    } else if (maxBitrate >= 60_000_000) {
      level = CodecProfileLevel.VP9Level5;
    } else if (maxBitrate >= 30_000_000) {
      level = CodecProfileLevel.VP9Level41;
    } else if (maxBitrate >= 18_000_000) {
      level = CodecProfileLevel.VP9Level4;
    } else if (maxBitrate >= 12_000_000) {
      level = CodecProfileLevel.VP9Level31;
    } else if (maxBitrate >= 7_200_000) {
      level = CodecProfileLevel.VP9Level3;
    } else if (maxBitrate >= 3_600_000) {
      level = CodecProfileLevel.VP9Level21;
    } else if (maxBitrate >= 1_800_000) {
      level = CodecProfileLevel.VP9Level2;
    } else if (maxBitrate >= 800_000) {
      level = CodecProfileLevel.VP9Level11;
    } else { // Assume level 1 is always supported.
      level = CodecProfileLevel.VP9Level1;
    }

    CodecProfileLevel profileLevel = new CodecProfileLevel();
    // Since this method is for legacy devices only, assume that only profile 0 is supported.
    profileLevel.profile = CodecProfileLevel.VP9Profile0;
    profileLevel.level = level;

    return new CodecProfileLevel[] {profileLevel};
  }

  /**
   * Returns whether the decoder is known to fail when adapting, despite advertising itself as an
   * adaptive decoder.
   *
   * @param name The decoder name.
   * @return True if the decoder is known to fail when adapting.
   */
  private static boolean needsDisableAdaptationWorkaround(String name) {
    return Util.SDK_INT <= 22
        && ("ODROID-XU3".equals(Util.MODEL) || "Nexus 10".equals(Util.MODEL))
        && ("OMX.Exynos.AVC.Decoder".equals(name) || "OMX.Exynos.AVC.Decoder.secure".equals(name));
  }

  /**
   * Returns whether the decoder is known to fail when an attempt is made to reconfigure it with a
   * new format's configuration data.
   *
   * @param name The name of the decoder.
   * @return Whether the decoder is known to fail when an attempt is made to reconfigure it with a
   *     new format's configuration data.
   */
  private static boolean needsAdaptationReconfigureWorkaround(String name) {
    return Util.MODEL.startsWith("SM-T230") && "OMX.MARVELL.VIDEO.HW.CODA7542DECODER".equals(name);
  }

  /**
   * Returns whether the decoder is known to behave incorrectly if flushed to adapt to a new format.
   *
   * @param mimeType The name of the MIME type.
   * @return Whether the decoder is known to to behave incorrectly if flushed to adapt to a new
   *     format.
   */
  private static boolean needsAdaptationFlushWorkaround(String mimeType) {
    // For Opus, we don't flush and reuse the codec because the decoder may discard samples after
    // flushing, which would result in audio being dropped just after a stream change (see
    // [Internal: b/143450854]). For other formats, we allow reuse after flushing if the codec
    // initialization data is unchanged.
    return MimeTypes.AUDIO_OPUS.equals(mimeType);
  }

  /**
   * Capabilities are known to be inaccurately reported for vertical resolutions on some devices.
   * [Internal ref: b/31387661]. When this workaround is enabled, we also check whether the
   * capabilities indicate support if the width and height are swapped. If they do, we assume that
   * the vertical resolution is also supported.
   *
   * @param name The name of the codec.
   * @return Whether to enable the workaround.
   */
  private static final boolean needsRotatedVerticalResolutionWorkaround(String name) {
    if ("OMX.MTK.VIDEO.DECODER.HEVC".equals(name) && "mcv5a".equals(Util.DEVICE)) {
      // See https://github.com/google/ExoPlayer/issues/6612.
      return false;
    }
    return true;
  }

  /**
   * Whether a profile is excluded from the list of supported profiles. This may happen when a
   * device declares support for a profile it doesn't actually support.
   */
  private static boolean needsProfileExcludedWorkaround(String mimeType, int profile) {
    // See https://github.com/google/ExoPlayer/issues/3537
    return MimeTypes.VIDEO_H265.equals(mimeType)
        && CodecProfileLevel.HEVCProfileMain10 == profile
        && ("sailfish".equals(Util.DEVICE) || "marlin".equals(Util.DEVICE));
  }
}
