1 | package org.farng.mp3.id3; |
2 | |
3 | /** |
4 | * <h3>4.11. Relative volume adjustment (2)</h3> |
5 | * <p/> |
6 | * <p> This is a more subjective frame than the previous ones. It allows the<br> user to say |
7 | * how much he wants to increase/decrease the volume on each<br> channel when the file is played. The |
8 | * purpose is to be able to align<br> |
9 | * <p/> |
10 | * all files to a reference volume, so that you don't have to change the<br> volume |
11 | * constantly. This frame may also be used to balance adjust the<br> audio. The volume adjustment is |
12 | * encoded as a fixed point decibel<br> value, 16 bit signed integer representing (adjustment*512), |
13 | * giving<br> +/- 64 dB with a precision of 0.001953125 dB. E.g. +2 dB is stored as<br> |
14 | * <p/> |
15 | * $04 00 and -2 dB is $FC 00. There may be more than one "RVA2" frame<br> in each |
16 | * tag, but only one with the same identification string.</p> |
17 | * <p/> |
18 | * <p> <Header for 'Relative volume adjustment (2)', ID: "RVA2"><br> |
19 | * |
20 | * <p/> |
21 | * Identification <text string> $00</p> |
22 | * <p/> |
23 | * <p> The 'identification' string is used to identify the situation and/or<br> device where |
24 | * this adjustment should apply. The following is then<br> repeated for every channel</p> |
25 | * <p/> |
26 | * <p> Type of channel $xx<br> |
27 | * Volume adjustment $xx xx<br> |
28 | * Bits representing peak $xx<br> |
29 | * <p/> |
30 | * Peak volume $xx (xx |
31 | * ...)<br> </p> |
32 | * <p/> |
33 | * <p> Type of channel: $00 Other<br> |
34 | * <p/> |
35 | * $01 Master volume<br> |
36 | * $02 Front right<br> |
37 | * $03 Front left<br> |
38 | * <p/> |
39 | * |
40 | * $04 Back right<br> |
41 | * $05 Back left<br> |
42 | * $06 Front centre<br> |
43 | * <p/> |
44 | * |
45 | * $07 Back centre<br> |
46 | * $08 Subwoofer</p> |
47 | * <p/> |
48 | * <p> Bits representing peak can be any number between 0 and 255. 0 means<br> |
49 | * <p/> |
50 | * that there is no peak volume field. The peak volume field is always<br> padded to whole |
51 | * bytes, setting the most significant bits to zero.<br> </p> |
52 | * |
53 | * @author Eric Farng |
54 | * @version $Revision: 1.3 $ |
55 | */ |
56 | public class FrameBodyRVA2 extends AbstractID3v2FrameBody { |
57 | |
58 | /** |
59 | * Creates a new FrameBodyRVA2 object. |
60 | */ |
61 | public FrameBodyRVA2() { |
62 | super(); |
63 | } |
64 | |
65 | /** |
66 | * Creates a new FrameBodyRVA2 object. |
67 | */ |
68 | public FrameBodyRVA2(final FrameBodyRVA2 body) { |
69 | super(body); |
70 | } |
71 | |
72 | protected void setupObjectList() { |
73 | throw new UnsupportedOperationException("This frame has not been implemented."); |
74 | } |
75 | |
76 | public String getIdentifier() { |
77 | throw new UnsupportedOperationException("This frame has not been implemented."); |
78 | } |
79 | } |