1 /* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
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
13 * express or implied.
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
17 */
18 /*
19 This PVA_FF_HintMediaHeaderAtom Class contains general presentation information,
20 independent of coding, about the audio media within the stream.
21 */
22
23
24 #define IMPLEMENT_HintMediaHeaderAtom
25
26 #include "hintmediaheaderatom.h"
27 #include "atomutils.h"
28 #include "a_atomdefs.h"
29
30 // Constructor
PVA_FF_HintMediaHeaderAtom()31 PVA_FF_HintMediaHeaderAtom::PVA_FF_HintMediaHeaderAtom()
32 : PVA_FF_MediaInformationHeaderAtom(HINT_MEDIA_HEADER_ATOM, (uint8)0, (uint32) 0) // version = 0!
33 {
34 init();
35 recomputeSize();
36 }
37
38
39 // Destructor
~PVA_FF_HintMediaHeaderAtom()40 PVA_FF_HintMediaHeaderAtom::~PVA_FF_HintMediaHeaderAtom()
41 {
42 // Empty
43 }
44
45 void
init()46 PVA_FF_HintMediaHeaderAtom::init()
47 {
48 _maxPDUSize = 0;
49 _avgPDUSize = 0;
50 _maxBitrate = 0;
51 _avgBitrate = 0;
52 _slidingAvgBitrate = 0;
53 }
54
55 uint32
getMediaInformationHeaderType() const56 PVA_FF_HintMediaHeaderAtom::getMediaInformationHeaderType() const
57 {
58 return (uint32)MEDIA_INFORMATION_HEADER_TYPE_HINT;
59 }
60
61
62 // Rendering the PVA_FF_Atom in proper format (bitlengths, etc.) to an ostream
63 bool
renderToFileStream(MP4_AUTHOR_FF_FILE_IO_WRAP * fp)64 PVA_FF_HintMediaHeaderAtom::renderToFileStream(MP4_AUTHOR_FF_FILE_IO_WRAP *fp)
65 {
66 int32 rendered = 0;
67
68 if (!renderAtomBaseMembers(fp))
69 {
70 return false;
71 }
72 rendered += getDefaultSize();
73
74 // Render member variables
75 if (!PVA_FF_AtomUtils::render16(fp, getMaxPDUSize()))
76 {
77 return false;
78 }
79 if (!PVA_FF_AtomUtils::render16(fp, getAvgPDUSize()))
80 {
81 return false;
82 }
83 rendered += 4;
84
85 if (!PVA_FF_AtomUtils::render32(fp, getMaxBitrate()))
86 {
87 return false;
88 }
89 if (!PVA_FF_AtomUtils::render32(fp, getAvgBitrate()))
90 {
91 return false;
92 }
93 if (!PVA_FF_AtomUtils::render32(fp, getSlidingAvgBitrate()))
94 {
95 return false;
96 }
97 rendered += 12;
98
99 return true;
100 }
101
102
103
104 void
recomputeSize()105 PVA_FF_HintMediaHeaderAtom::recomputeSize()
106 {
107 int32 size = getDefaultSize();
108 size += 4; // for max and avf PDU sizes
109 size += 12; // for max, avg, and sliding bitrates
110
111 _size = size;
112 }
113
114