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Parse metadata from srfr atom in SMTA.
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libraries/extractor/src/main/java/androidx/media3/extractor/mp4/SmtaAtomUtil.java
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Copyright 2023 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.extractor.mp4; | ||
|
|
||
| import static java.lang.annotation.ElementType.TYPE_USE; | ||
|
|
||
| import androidx.annotation.IntDef; | ||
| import androidx.annotation.Nullable; | ||
| import androidx.media3.common.C; | ||
| import androidx.media3.common.Metadata; | ||
| import androidx.media3.common.util.ParsableByteArray; | ||
| import androidx.media3.common.util.UnstableApi; | ||
| import androidx.media3.extractor.metadata.mp4.SmtaMetadataEntry; | ||
| import java.lang.annotation.Documented; | ||
| import java.lang.annotation.Retention; | ||
| import java.lang.annotation.RetentionPolicy; | ||
| import java.lang.annotation.Target; | ||
|
|
||
| /** | ||
| * Utility methods for handling SMTA atoms. | ||
| * | ||
| * <p>See [Internal: b/150138465#comment76], [Internal: b/301273734#comment17]. | ||
| */ | ||
| @UnstableApi | ||
| public final class SmtaAtomUtil { | ||
|
|
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| @Documented | ||
| @Retention(RetentionPolicy.SOURCE) | ||
| @Target(TYPE_USE) | ||
| @IntDef( | ||
| open = true, | ||
| value = { | ||
| NO_VALUE, | ||
| CAMCORDER_NORMAL, | ||
| CAMCORDER_SINGLE_SUPERSLOW_MOTION, | ||
| CAMCORDER_FRC_SUPERSLOW_MOTION, | ||
| CAMCORDER_SLOW_MOTION_V2, | ||
| CAMCORDER_SLOW_MOTION_V2_120, | ||
| CAMCORDER_SLOW_MOTION_V2_HEVC, | ||
| CAMCORDER_FRC_SUPERSLOW_MOTION_HEVC, | ||
| CAMCORDER_QFRC_SUPERSLOW_MOTION, | ||
| }) | ||
| private @interface RecordingMode {} | ||
|
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| private static final int NO_VALUE = -1; | ||
| private static final int CAMCORDER_NORMAL = 0; | ||
| private static final int CAMCORDER_SINGLE_SUPERSLOW_MOTION = 7; | ||
| private static final int CAMCORDER_FRC_SUPERSLOW_MOTION = 9; | ||
| private static final int CAMCORDER_SLOW_MOTION_V2 = 12; | ||
| private static final int CAMCORDER_SLOW_MOTION_V2_120 = 13; | ||
| private static final int CAMCORDER_SLOW_MOTION_V2_HEVC = 21; | ||
| private static final int CAMCORDER_FRC_SUPERSLOW_MOTION_HEVC = 22; | ||
| private static final int CAMCORDER_QFRC_SUPERSLOW_MOTION = 23; | ||
|
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| private SmtaAtomUtil() {} | ||
|
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| /** Parses metadata from a Samsung smta atom. */ | ||
| @Nullable | ||
| public static Metadata parseSmta(ParsableByteArray smta, int limit) { | ||
| smta.skipBytes(Atom.FULL_HEADER_SIZE); | ||
| while (smta.getPosition() < limit) { | ||
| int atomPosition = smta.getPosition(); | ||
| int atomSize = smta.readInt(); | ||
| int atomType = smta.readInt(); | ||
| if (atomType == Atom.TYPE_saut) { | ||
| // Size (4), Type (4), Author (4), Recording mode (2), SVC layer count (2). | ||
| if (atomSize < 16) { | ||
| return null; | ||
| } | ||
| smta.skipBytes(4); // Author (4) | ||
|
|
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| // Each field is stored as a key (1 byte) value (1 byte) pairs. | ||
| // The order of the fields is not guaranteed. | ||
| @RecordingMode int recordingMode = NO_VALUE; | ||
| int svcTemporalLayerCount = 0; | ||
| for (int i = 0; i < 2; i++) { | ||
| int key = smta.readUnsignedByte(); | ||
| int value = smta.readUnsignedByte(); | ||
| if (key == 0x00) { // recordingMode key | ||
| recordingMode = value; | ||
| } else if (key == 0x01) { // svcTemporalLayerCount key | ||
| svcTemporalLayerCount = value; | ||
| } | ||
| } | ||
|
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| int captureFrameRate = getCaptureFrameRate(recordingMode, smta, limit); | ||
| if (captureFrameRate == C.RATE_UNSET_INT) { | ||
| return null; | ||
| } | ||
|
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| return new Metadata(new SmtaMetadataEntry(captureFrameRate, svcTemporalLayerCount)); | ||
| } | ||
| smta.setPosition(atomPosition + atomSize); | ||
| } | ||
| return null; | ||
| } | ||
|
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| /** | ||
| * Returns the capture frame rate for the given recording mode, if supported. | ||
| * | ||
| * <p>For {@link #CAMCORDER_SLOW_MOTION_V2_HEVC}, this is done by parsing the Samsung 'srfr' atom. | ||
| * | ||
| * @return The capture frame rate value, or {@link C#RATE_UNSET_INT} if unavailable. | ||
| */ | ||
| private static int getCaptureFrameRate( | ||
| @RecordingMode int recordingMode, ParsableByteArray smta, int limit) { | ||
| // V2 and V2_120 have fixed capture frame rates. | ||
| if (recordingMode == CAMCORDER_SLOW_MOTION_V2) { | ||
| return 240; | ||
| } else if (recordingMode == CAMCORDER_SLOW_MOTION_V2_120) { | ||
| return 120; | ||
| } else if (recordingMode != CAMCORDER_SLOW_MOTION_V2_HEVC) { | ||
| return C.RATE_UNSET_INT; | ||
| } | ||
|
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| if (smta.bytesLeft() < Atom.HEADER_SIZE || smta.getPosition() + Atom.HEADER_SIZE > limit) { | ||
| return C.RATE_UNSET_INT; | ||
| } | ||
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| int atomSize = smta.readInt(); | ||
| int atomType = smta.readInt(); | ||
| if (atomSize < 12 || atomType != Atom.TYPE_srfr) { | ||
| return C.RATE_UNSET_INT; | ||
| } | ||
| // Capture frame rate is in Q16 format. | ||
| return smta.readUnsignedFixedPoint1616(); | ||
| } | ||
| } |
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libraries/test_data/src/test/assets/media/mp4/sample_sef_slow_motion_hevc.mp4
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