1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/*
* 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 org.mozilla.thirdparty.com.google.android.exoplayer2.video;
import org.mozilla.thirdparty.com.google.android.exoplayer2.Format;
import org.mozilla.thirdparty.com.google.android.exoplayer2.ParserException;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.CodecSpecificDataUtil;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.NalUnitUtil;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.NalUnitUtil.SpsData;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.ParsableByteArray;
import java.util.ArrayList;
import java.util.List;
/**
* AVC configuration data.
*/
public final class AvcConfig {
public final List<byte[]> initializationData;
public final int nalUnitLengthFieldLength;
public final int width;
public final int height;
public final float pixelWidthAspectRatio;
/**
* Parses AVC configuration data.
*
* @param data A {@link ParsableByteArray}, whose position is set to the start of the AVC
* configuration data to parse.
* @return A parsed representation of the HEVC configuration data.
* @throws ParserException If an error occurred parsing the data.
*/
public static AvcConfig parse(ParsableByteArray data) throws ParserException {
try {
data.skipBytes(4); // Skip to the AVCDecoderConfigurationRecord (defined in 14496-15)
int nalUnitLengthFieldLength = (data.readUnsignedByte() & 0x3) + 1;
if (nalUnitLengthFieldLength == 3) {
throw new IllegalStateException();
}
List<byte[]> initializationData = new ArrayList<>();
int numSequenceParameterSets = data.readUnsignedByte() & 0x1F;
for (int j = 0; j < numSequenceParameterSets; j++) {
initializationData.add(buildNalUnitForChild(data));
}
int numPictureParameterSets = data.readUnsignedByte();
for (int j = 0; j < numPictureParameterSets; j++) {
initializationData.add(buildNalUnitForChild(data));
}
int width = Format.NO_VALUE;
int height = Format.NO_VALUE;
float pixelWidthAspectRatio = 1;
if (numSequenceParameterSets > 0) {
byte[] sps = initializationData.get(0);
SpsData spsData = NalUnitUtil.parseSpsNalUnit(initializationData.get(0),
nalUnitLengthFieldLength, sps.length);
width = spsData.width;
height = spsData.height;
pixelWidthAspectRatio = spsData.pixelWidthAspectRatio;
}
return new AvcConfig(initializationData, nalUnitLengthFieldLength, width, height,
pixelWidthAspectRatio);
} catch (ArrayIndexOutOfBoundsException e) {
throw new ParserException("Error parsing AVC config", e);
}
}
private AvcConfig(List<byte[]> initializationData, int nalUnitLengthFieldLength,
int width, int height, float pixelWidthAspectRatio) {
this.initializationData = initializationData;
this.nalUnitLengthFieldLength = nalUnitLengthFieldLength;
this.width = width;
this.height = height;
this.pixelWidthAspectRatio = pixelWidthAspectRatio;
}
private static byte[] buildNalUnitForChild(ParsableByteArray data) {
int length = data.readUnsignedShort();
int offset = data.getPosition();
data.skipBytes(length);
return CodecSpecificDataUtil.buildNalUnit(data.data, offset, length);
}
}
|
