mirror of https://github.com/NekoX-Dev/NekoX.git
210 lines
6.9 KiB
Java
210 lines
6.9 KiB
Java
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.android.exoplayer2.decoder;
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import androidx.annotation.IntDef;
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import androidx.annotation.Nullable;
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import com.google.android.exoplayer2.C;
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import java.lang.annotation.Documented;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.nio.ByteBuffer;
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import org.checkerframework.checker.nullness.qual.EnsuresNonNull;
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/**
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* Holds input for a decoder.
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*/
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public class DecoderInputBuffer extends Buffer {
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/**
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* The buffer replacement mode, which may disable replacement. One of {@link
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* #BUFFER_REPLACEMENT_MODE_DISABLED}, {@link #BUFFER_REPLACEMENT_MODE_NORMAL} or {@link
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* #BUFFER_REPLACEMENT_MODE_DIRECT}.
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*/
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@Documented
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@Retention(RetentionPolicy.SOURCE)
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@IntDef({
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BUFFER_REPLACEMENT_MODE_DISABLED,
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BUFFER_REPLACEMENT_MODE_NORMAL,
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BUFFER_REPLACEMENT_MODE_DIRECT
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})
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public @interface BufferReplacementMode {}
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/**
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* Disallows buffer replacement.
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*/
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public static final int BUFFER_REPLACEMENT_MODE_DISABLED = 0;
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/**
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* Allows buffer replacement using {@link ByteBuffer#allocate(int)}.
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*/
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public static final int BUFFER_REPLACEMENT_MODE_NORMAL = 1;
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/**
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* Allows buffer replacement using {@link ByteBuffer#allocateDirect(int)}.
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*/
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public static final int BUFFER_REPLACEMENT_MODE_DIRECT = 2;
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/**
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* {@link CryptoInfo} for encrypted data.
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*/
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public final CryptoInfo cryptoInfo;
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/** The buffer's data, or {@code null} if no data has been set. */
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@Nullable public ByteBuffer data;
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// TODO: Remove this temporary signaling once end-of-stream propagation for clips using content
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// protection is fixed. See [Internal: b/153326944] for details.
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/**
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* Whether the last attempt to read a sample into this buffer failed due to not yet having the DRM
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* keys associated with the next sample.
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*/
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public boolean waitingForKeys;
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/**
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* The time at which the sample should be presented.
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*/
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public long timeUs;
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/**
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* Supplemental data related to the buffer, if {@link #hasSupplementalData()} returns true. If
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* present, the buffer is populated with supplemental data from position 0 to its limit.
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*/
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@Nullable public ByteBuffer supplementalData;
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@BufferReplacementMode private final int bufferReplacementMode;
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/**
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* Creates a new instance for which {@link #isFlagsOnly()} will return true.
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*
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* @return A new flags only input buffer.
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*/
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public static DecoderInputBuffer newFlagsOnlyInstance() {
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return new DecoderInputBuffer(BUFFER_REPLACEMENT_MODE_DISABLED);
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}
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/**
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* @param bufferReplacementMode Determines the behavior of {@link #ensureSpaceForWrite(int)}. One
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* of {@link #BUFFER_REPLACEMENT_MODE_DISABLED}, {@link #BUFFER_REPLACEMENT_MODE_NORMAL} and
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* {@link #BUFFER_REPLACEMENT_MODE_DIRECT}.
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*/
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public DecoderInputBuffer(@BufferReplacementMode int bufferReplacementMode) {
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this.cryptoInfo = new CryptoInfo();
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this.bufferReplacementMode = bufferReplacementMode;
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}
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/**
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* Clears {@link #supplementalData} and ensures that it's large enough to accommodate {@code
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* length} bytes.
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*
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* @param length The length of the supplemental data that must be accommodated, in bytes.
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*/
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@EnsuresNonNull("supplementalData")
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public void resetSupplementalData(int length) {
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if (supplementalData == null || supplementalData.capacity() < length) {
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supplementalData = ByteBuffer.allocate(length);
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} else {
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supplementalData.clear();
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}
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}
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/**
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* Ensures that {@link #data} is large enough to accommodate a write of a given length at its
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* current position.
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*
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* <p>If the capacity of {@link #data} is sufficient this method does nothing. If the capacity is
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* insufficient then an attempt is made to replace {@link #data} with a new {@link ByteBuffer}
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* whose capacity is sufficient. Data up to the current position is copied to the new buffer.
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*
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* @param length The length of the write that must be accommodated, in bytes.
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* @throws IllegalStateException If there is insufficient capacity to accommodate the write and
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* the buffer replacement mode of the holder is {@link #BUFFER_REPLACEMENT_MODE_DISABLED}.
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*/
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@EnsuresNonNull("data")
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public void ensureSpaceForWrite(int length) {
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if (data == null) {
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data = createReplacementByteBuffer(length);
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return;
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}
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// Check whether the current buffer is sufficient.
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int capacity = data.capacity();
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int position = data.position();
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int requiredCapacity = position + length;
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if (capacity >= requiredCapacity) {
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return;
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}
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// Instantiate a new buffer if possible.
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ByteBuffer newData = createReplacementByteBuffer(requiredCapacity);
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newData.order(data.order());
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// Copy data up to the current position from the old buffer to the new one.
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if (position > 0) {
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data.flip();
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newData.put(data);
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}
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// Set the new buffer.
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data = newData;
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}
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/**
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* Returns whether the buffer is only able to hold flags, meaning {@link #data} is null and
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* its replacement mode is {@link #BUFFER_REPLACEMENT_MODE_DISABLED}.
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*/
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public final boolean isFlagsOnly() {
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return data == null && bufferReplacementMode == BUFFER_REPLACEMENT_MODE_DISABLED;
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}
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/**
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* Returns whether the {@link C#BUFFER_FLAG_ENCRYPTED} flag is set.
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*/
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public final boolean isEncrypted() {
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return getFlag(C.BUFFER_FLAG_ENCRYPTED);
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}
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/**
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* Flips {@link #data} and {@link #supplementalData} in preparation for being queued to a decoder.
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*
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* @see java.nio.Buffer#flip()
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*/
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public final void flip() {
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data.flip();
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if (supplementalData != null) {
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supplementalData.flip();
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}
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}
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@Override
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public void clear() {
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super.clear();
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if (data != null) {
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data.clear();
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}
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if (supplementalData != null) {
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supplementalData.clear();
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}
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waitingForKeys = false;
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}
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private ByteBuffer createReplacementByteBuffer(int requiredCapacity) {
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if (bufferReplacementMode == BUFFER_REPLACEMENT_MODE_NORMAL) {
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return ByteBuffer.allocate(requiredCapacity);
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} else if (bufferReplacementMode == BUFFER_REPLACEMENT_MODE_DIRECT) {
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return ByteBuffer.allocateDirect(requiredCapacity);
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} else {
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int currentCapacity = data == null ? 0 : data.capacity();
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throw new IllegalStateException("Buffer too small (" + currentCapacity + " < "
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+ requiredCapacity + ")");
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}
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}
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}
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