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1 | !include once #1032914 // VorbisJava |
2 | |
3 | /* |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
5 | * you may not use this file except in compliance with the License. |
6 | * You may obtain a copy of the License at |
7 | * |
8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * |
10 | * Unless required by applicable law or agreed to in writing, software |
11 | * distributed under the License is distributed on an "AS IS" BASIS, |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
13 | * See the License for the specific language governing permissions and |
14 | * limitations under the License. |
15 | */ |
16 | |
17 | /** |
18 | * Represents a logical group of data. |
19 | * RFC3533 suggests that these should usually be |
20 | * around 50-200 bytes long. |
21 | */ |
22 | sclass OggStreamPacket extends OggPacketData {
|
23 | private OggStreamPage parent; // Last page if split |
24 | private boolean bos; |
25 | private boolean eos; |
26 | |
27 | /** |
28 | * Creates a new Ogg Packet based on data read |
29 | * from within an Ogg Page. |
30 | */ |
31 | *(OggStreamPage parent, byte[] data, boolean bos, boolean eos) {
|
32 | super(data); |
33 | this.parent = parent; |
34 | this.bos = bos; |
35 | this.eos = eos; |
36 | } |
37 | /** |
38 | * Creates a new Ogg Packet filled with data to |
39 | * be later written. |
40 | * The Sid, and begin/end flags will be available |
41 | * after the packet has been flushed. |
42 | */ |
43 | *(byte[] data) {
|
44 | super(data); |
45 | } |
46 | |
47 | protected void setParent(OggStreamPage parent) {
|
48 | this.parent = parent; |
49 | } |
50 | protected void setIsBOS() {
|
51 | this.bos = true; |
52 | } |
53 | protected void setIsEOS() {
|
54 | this.eos = true; |
55 | } |
56 | |
57 | /** Unit tests only! */ |
58 | protected OggStreamPage _getParent() {
|
59 | return parent; |
60 | } |
61 | |
62 | /** |
63 | * Returns the Stream ID (Sid) that |
64 | * this packet belongs to. |
65 | */ |
66 | public int getSid() {
|
67 | return parent.getSid(); |
68 | } |
69 | /** |
70 | * Returns the granule position of the page |
71 | * that this packet belongs to. The meaning |
72 | * of the granule depends on the codec. |
73 | */ |
74 | public long getGranulePosition() {
|
75 | return parent.getGranulePosition(); |
76 | } |
77 | /** |
78 | * Returns the sequence number within the stream |
79 | * of the page that this packet belongs to. |
80 | * You can use this to detect when pages have |
81 | * been lost. |
82 | */ |
83 | public int getSequenceNumber() {
|
84 | return parent.getSequenceNumber(); |
85 | } |
86 | |
87 | /** |
88 | * Returns the number of bytes overhead of the {@link OggStreamPage}
|
89 | * we belong to, if we're the only packet in the page, or |
90 | * a rough guess if we span multiple pages / share a page. |
91 | */ |
92 | public int getOverheadBytes() {
|
93 | if (parent == null) return 0; |
94 | |
95 | double ourShare = 1.0; |
96 | int ourDataLen = getData().length; |
97 | int pageDataLen = parent.getDataSize(); |
98 | if (pageDataLen != ourDataLen) {
|
99 | // We don't have a page to ourselves, so we can't come up |
100 | // with a fully accurate overhead at this stage, so get close |
101 | |
102 | // Do we span multiple pages? |
103 | if (ourDataLen > pageDataLen) {
|
104 | // Take a best guess, rounding up |
105 | int approxPages = (int)Math.ceil(ourDataLen/pageDataLen); |
106 | ourShare = approxPages; |
107 | } else {
|
108 | // We're probably just a part of a larger page |
109 | // Take a rough guess |
110 | ourShare = ((double)ourDataLen) / pageDataLen; |
111 | } |
112 | } |
113 | // Take the current page's overhead, scale as needed, and return |
114 | return (int)Math.rint(ourShare * (parent.getPageSize() - pageDataLen)); |
115 | } |
116 | |
117 | /** |
118 | * Is this the first packet in the stream? |
119 | * If so, the data should hold the magic |
120 | * information required to identify which |
121 | * decoder will be needed. |
122 | */ |
123 | public boolean isBeginningOfStream() {
|
124 | return bos; |
125 | } |
126 | /** |
127 | * Is this the last packet in the stream? |
128 | */ |
129 | public boolean isEndOfStream() {
|
130 | return eos; |
131 | } |
132 | } |
Began life as a copy of #1032913
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| Snippet ID: | #1032915 |
| Snippet name: | OggStreamPacket |
| Eternal ID of this version: | #1032915/2 |
| Text MD5: | 5c04cb000b20c7e4d6d6c200c4258e79 |
| Transpilation MD5: | fe38e5a22baa73e15888f02890750f9a |
| Author: | stefan |
| Category: | javax / audio |
| Type: | JavaX fragment (include) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2021-10-10 21:28:42 |
| Source code size: | 4119 bytes / 132 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 188 / 527 |
| Version history: | 1 change(s) |
| Referenced in: | [show references] |