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_ChunkOffsetAtom Class gives the index of each chunk into the
20 containing FILE.
21 */
22
23 #define IMPLEMENT_ChunkOffsetAtom
24
25 #include "chunkoffsetatom.h"
26 #include "atomutils.h"
27 #include "a_atomdefs.h"
28
29 typedef Oscl_Vector<uint32, OsclMemAllocator> uint32VecType;
30 // Constructor
PVA_FF_ChunkOffsetAtom(uint32 mediaType,uint32 fileAuthoringFlags)31 PVA_FF_ChunkOffsetAtom::PVA_FF_ChunkOffsetAtom(uint32 mediaType,
32 uint32 fileAuthoringFlags)
33 : PVA_FF_FullAtom(FourCharConstToUint32('s', 't', 'c', 'o'), (uint8)0, (uint32)0),
34 _mediaType(mediaType)
35 {
36 _oInterLeaveMode = false;
37 _modified = true; // True for a new atom
38 _entryCount = 0;
39 _currentDataOffset = 0;
40
41 PV_MP4_FF_NEW(fp->auditCB, uint32VecType, (), _pchunkOffsets);
42
43 if (fileAuthoringFlags & PVMP4FF_SET_MEDIA_INTERLEAVE_MODE)
44 {
45 _oInterLeaveMode = true;
46 }
47
48 recomputeSize();
49 }
50
51 // Destructor
~PVA_FF_ChunkOffsetAtom()52 PVA_FF_ChunkOffsetAtom::~PVA_FF_ChunkOffsetAtom()
53 {
54 // Cleanup vector
55 PV_MP4_FF_TEMPLATED_DELETE(NULL, uint32VecType, Oscl_Vector, _pchunkOffsets);
56 }
57
58 void
nextSample(uint32 size,bool isChunkStart,uint32 baseOffset)59 PVA_FF_ChunkOffsetAtom::nextSample(uint32 size,
60 bool isChunkStart, uint32 baseOffset)
61 {
62 // If sample is the start of a new chunk, add the current offset entry
63 if (isChunkStart)
64 {
65 if (_oInterLeaveMode)
66 {
67 addChunkOffset(baseOffset);
68 return;
69 }
70 else
71 {
72 addChunkOffset(_currentDataOffset);
73 }
74 }
75
76 // Increment the size of the offset by the length of this sample
77 switch (_mediaType)
78 {
79 case MEDIA_TYPE_TEXT: //for timed text track
80 case MEDIA_TYPE_AUDIO:
81 case MEDIA_TYPE_VISUAL:
82 {
83 _currentDataOffset += size;
84 }
85 break;
86 case MEDIA_TYPE_UNKNOWN:
87 default:
88 break;
89 }
90 }
91
92 // Adding to and getting first chunk offset values
93 void
addChunkOffset(uint32 offset)94 PVA_FF_ChunkOffsetAtom::addChunkOffset(uint32 offset)
95 {
96 _pchunkOffsets->push_back(offset);
97 _entryCount += 1;
98
99 recomputeSize();
100 }
101
102
103 // Updating all the chunk entries based on the current file offset at which
104 // the corresponding mediaDataAtom MEDIA_DATA_ATOM gets rendered to disk
105 void
updateChunkEntries(uint32 fileOffset)106 PVA_FF_ChunkOffsetAtom::updateChunkEntries(uint32 fileOffset)
107 {
108 if (_modified)
109 {
110 for (uint32 i = 0; i < _pchunkOffsets->size(); i++)
111 {
112 (*_pchunkOffsets)[i] += fileOffset;
113 }
114 _modified = false;
115 return;
116 }
117 }
118
119
120 // Rendering the PVA_FF_Atom in proper format (bitlengths, etc.) to an ostream
121 bool
renderToFileStream(MP4_AUTHOR_FF_FILE_IO_WRAP * fp)122 PVA_FF_ChunkOffsetAtom::renderToFileStream(MP4_AUTHOR_FF_FILE_IO_WRAP *fp)
123 {
124 int32 rendered = 0;
125
126 if (!renderAtomBaseMembers(fp))
127 {
128 return false;
129 }
130 rendered += getDefaultSize();
131
132 if (!PVA_FF_AtomUtils::render32(fp, getEntryCount()))
133 {
134 return false;
135 }
136 rendered += 4;
137
138 if (_pchunkOffsets->size() < getEntryCount())
139 {
140 return false;
141 }
142 for (uint32 i = 0; i < getEntryCount(); i++)
143 {
144 if (!PVA_FF_AtomUtils::render32(fp, (*_pchunkOffsets)[i]))
145 {
146 return false;
147 }
148 }
149 rendered += 4 * getEntryCount();
150
151 return true;
152 }
153
154 void
recomputeSize()155 PVA_FF_ChunkOffsetAtom::recomputeSize()
156 {
157 int size = getDefaultSize();
158 size += 4; // For entryCount
159 size += 4 * getEntryCount();
160
161 _size = size;
162
163 // Update the parent atom size
164 if (_pparent != NULL)
165 {
166 _pparent->recomputeSize();
167 }
168 }
169
170 void
reAuthorFirstChunkOffset(uint32 offset)171 PVA_FF_ChunkOffsetAtom::reAuthorFirstChunkOffset(uint32 offset)
172 {
173 (*_pchunkOffsets)[0] = offset;
174 }
175