Add an HLS metadata entry sublcass to populate HLS track formats

Include information to facilitate adaptive track selection in HLS.

PiperOrigin-RevId: 243238232

RELEASENOTES.md

@@ -18,6 +18,7 @@
   * Support encrypted initialization segments
     ([#5441](https://github.com/google/ExoPlayer/issues/5441)).
   * Parse `EXT-X-MEDIA` `CHARACTERISTICS` attribute into `Format.roleFlags`.
+  * Add metadata entry for HLS tracks to expose master playlist information.
 * MPEG-TS: enable HDMV DTS stream detection only if a flag is set. By default
   (if the flag is not set), the 0x82 elementary stream type is now treated as an
   SCTE subtitle track

library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsTrackMetadataEntry.java

@@ -0,0 +1,240 @@
+/*
+ * Copyright (C) 2019 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 com.google.android.exoplayer2.source.hls;
+
+import android.os.Parcel;
+import android.os.Parcelable;
+import androidx.annotation.Nullable;
+import android.text.TextUtils;
+import com.google.android.exoplayer2.metadata.Metadata;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/** Holds metadata associated to an HLS media track. */
+public final class HlsTrackMetadataEntry implements Metadata.Entry {
+
+  /** Holds attributes defined in an EXT-X-STREAM-INF tag. */
+  public static final class VariantInfo implements Parcelable {
+
+    /** The bitrate as declared by the EXT-X-STREAM-INF tag. */
+    public final long bitrate;
+
+    /**
+     * The VIDEO value as defined in the EXT-X-STREAM-INF tag, or null if the VIDEO attribute is not
+     * present.
+     */
+    @Nullable public final String videoGroupId;
+
+    /**
+     * The AUDIO value as defined in the EXT-X-STREAM-INF tag, or null if the AUDIO attribute is not
+     * present.
+     */
+    @Nullable public final String audioGroupId;
+
+    /**
+     * The SUBTITLES value as defined in the EXT-X-STREAM-INF tag, or null if the SUBTITLES
+     * attribute is not present.
+     */
+    @Nullable public final String subtitleGroupId;
+
+    /**
+     * The CLOSED-CAPTIONS value as defined in the EXT-X-STREAM-INF tag, or null if the
+     * CLOSED-CAPTIONS attribute is not present.
+     */
+    @Nullable public final String captionGroupId;
+
+    /**
+     * Creates an instance.
+     *
+     * @param bitrate See {@link #bitrate}.
+     * @param videoGroupId See {@link #videoGroupId}.
+     * @param audioGroupId See {@link #audioGroupId}.
+     * @param subtitleGroupId See {@link #subtitleGroupId}.
+     * @param captionGroupId See {@link #captionGroupId}.
+     */
+    public VariantInfo(
+        long bitrate,
+        @Nullable String videoGroupId,
+        @Nullable String audioGroupId,
+        @Nullable String subtitleGroupId,
+        @Nullable String captionGroupId) {
+      this.bitrate = bitrate;
+      this.videoGroupId = videoGroupId;
+      this.audioGroupId = audioGroupId;
+      this.subtitleGroupId = subtitleGroupId;
+      this.captionGroupId = captionGroupId;
+    }
+
+    /* package */ VariantInfo(Parcel in) {
+      bitrate = in.readLong();
+      videoGroupId = in.readString();
+      audioGroupId = in.readString();
+      subtitleGroupId = in.readString();
+      captionGroupId = in.readString();
+    }
+
+    @Override
+    public boolean equals(@Nullable Object other) {
+      if (this == other) {
+        return true;
+      }
+      if (other == null || getClass() != other.getClass()) {
+        return false;
+      }
+      VariantInfo that = (VariantInfo) other;
+      return bitrate == that.bitrate
+          && TextUtils.equals(videoGroupId, that.videoGroupId)
+          && TextUtils.equals(audioGroupId, that.audioGroupId)
+          && TextUtils.equals(subtitleGroupId, that.subtitleGroupId)
+          && TextUtils.equals(captionGroupId, that.captionGroupId);
+    }
+
+    @Override
+    public int hashCode() {
+      int result = (int) (bitrate ^ (bitrate >>> 32));
+      result = 31 * result + (videoGroupId != null ? videoGroupId.hashCode() : 0);
+      result = 31 * result + (audioGroupId != null ? audioGroupId.hashCode() : 0);
+      result = 31 * result + (subtitleGroupId != null ? subtitleGroupId.hashCode() : 0);
+      result = 31 * result + (captionGroupId != null ? captionGroupId.hashCode() : 0);
+      return result;
+    }
+
+    // Parcelable implementation.
+
+    @Override
+    public int describeContents() {
+      return 0;
+    }
+
+    @Override
+    public void writeToParcel(Parcel dest, int flags) {
+      dest.writeLong(bitrate);
+      dest.writeString(videoGroupId);
+      dest.writeString(audioGroupId);
+      dest.writeString(subtitleGroupId);
+      dest.writeString(captionGroupId);
+    }
+
+    public static final Parcelable.Creator<VariantInfo> CREATOR =
+        new Parcelable.Creator<VariantInfo>() {
+          @Override
+          public VariantInfo createFromParcel(Parcel in) {
+            return new VariantInfo(in);
+          }
+
+          @Override
+          public VariantInfo[] newArray(int size) {
+            return new VariantInfo[size];
+          }
+        };
+  }
+
+  /**
+   * The GROUP-ID value of this track, if the track is derived from an EXT-X-MEDIA tag. Null if the
+   * track is not derived from an EXT-X-MEDIA TAG.
+   */
+  @Nullable public final String groupId;
+  /**
+   * The NAME value of this track, if the track is derived from an EXT-X-MEDIA tag. Null if the
+   * track is not derived from an EXT-X-MEDIA TAG.
+   */
+  @Nullable public final String name;
+  /**
+   * The EXT-X-STREAM-INF tags attributes associated with this track. This field is non-applicable
+   * (and therefore empty) if this track is derived from an EXT-X-MEDIA tag.
+   */
+  public final List<VariantInfo> variantInfos;
+
+  /**
+   * Creates an instance.
+   *
+   * @param groupId See {@link #groupId}.
+   * @param name See {@link #name}.
+   * @param variantInfos See {@link #variantInfos}.
+   */
+  public HlsTrackMetadataEntry(
+      @Nullable String groupId, @Nullable String name, List<VariantInfo> variantInfos) {
+    this.groupId = groupId;
+    this.name = name;
+    this.variantInfos = Collections.unmodifiableList(new ArrayList<>(variantInfos));
+  }
+
+  /* package */ HlsTrackMetadataEntry(Parcel in) {
+    groupId = in.readString();
+    name = in.readString();
+    int variantInfoSize = in.readInt();
+    ArrayList<VariantInfo> variantInfos = new ArrayList<>(variantInfoSize);
+    for (int i = 0; i < variantInfoSize; i++) {
+      variantInfos.add(in.readParcelable(VariantInfo.class.getClassLoader()));
+    }
+    this.variantInfos = Collections.unmodifiableList(variantInfos);
+  }
+
+  @Override
+  public boolean equals(@Nullable Object other) {
+    if (this == other) {
+      return true;
+    }
+    if (other == null || getClass() != other.getClass()) {
+      return false;
+    }
+
+    HlsTrackMetadataEntry that = (HlsTrackMetadataEntry) other;
+    return TextUtils.equals(groupId, that.groupId)
+        && TextUtils.equals(name, that.name)
+        && variantInfos.equals(that.variantInfos);
+  }
+
+  @Override
+  public int hashCode() {
+    int result = groupId != null ? groupId.hashCode() : 0;
+    result = 31 * result + (name != null ? name.hashCode() : 0);
+    result = 31 * result + variantInfos.hashCode();
+    return result;
+  }
+
+  // Parcelable implementation.
+
+  @Override
+  public int describeContents() {
+    return 0;
+  }
+
+  @Override
+  public void writeToParcel(Parcel dest, int flags) {
+    dest.writeString(groupId);
+    dest.writeString(name);
+    int variantInfosSize = variantInfos.size();
+    dest.writeInt(variantInfosSize);
+    for (int i = 0; i < variantInfosSize; i++) {
+      dest.writeParcelable(variantInfos.get(i), /* parcelableFlags= */ 0);
+    }
+  }
+
+  public static final Parcelable.Creator<HlsTrackMetadataEntry> CREATOR =
+      new Parcelable.Creator<HlsTrackMetadataEntry>() {
+        @Override
+        public HlsTrackMetadataEntry createFromParcel(Parcel in) {
+          return new HlsTrackMetadataEntry(in);
+        }
+
+        @Override
+        public HlsTrackMetadataEntry[] newArray(int size) {
+          return new HlsTrackMetadataEntry[size];
+        }
+      };
+}