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_TimeToSampleAtom Class contains a compact version of a table that allows
20 indexing from decoding to sample number.
21 */
22
23
24 #define IMPLEMENT_TimeToSampleAtom
25
26 #include "timetosampleatom.h"
27 #include "atomutils.h"
28 #include "a_atomdefs.h"
29
30 typedef Oscl_Vector<uint32, OsclMemAllocator> uint32VecType;
31 typedef Oscl_Vector<int32, OsclMemAllocator> int32VecType;
32 // Constructor
PVA_FF_TimeToSampleAtom(uint32 mediaType)33 PVA_FF_TimeToSampleAtom::PVA_FF_TimeToSampleAtom(uint32 mediaType)
34 : PVA_FF_FullAtom(TIME_TO_SAMPLE_ATOM, (uint8)0, (uint32)0),
35 _mediaType(mediaType)
36 {
37 // Initializing members and vectors
38 _firstEntry = true;
39 _entryCount = 0;
40 _lastTSUpdated = false; // used in movie fragment mode not to update table before rendering
41
42 PV_MP4_FF_NEW(fp->auditCB, uint32VecType, (), _psampleCountVec);
43 PV_MP4_FF_NEW(fp->auditCB, int32VecType, (), _psampleDeltaVec);
44
45 recomputeSize();
46 }
47
48 // Destructor
~PVA_FF_TimeToSampleAtom()49 PVA_FF_TimeToSampleAtom::~PVA_FF_TimeToSampleAtom()
50 {
51 // DO CLEANUP OF VECTORS!!!
52 PV_MP4_FF_TEMPLATED_DELETE(NULL, uint32VecType, Oscl_Vector, _psampleCountVec);
53 PV_MP4_FF_TEMPLATED_DELETE(NULL, int32VecType, Oscl_Vector, _psampleDeltaVec);
54 }
55
56 void
nextSample(uint32 ts)57 PVA_FF_TimeToSampleAtom::nextSample(uint32 ts)
58 {
59 switch (_mediaType)
60 {
61 case MEDIA_TYPE_AUDIO: // sample fp an IMediaSample
62 case MEDIA_TYPE_VISUAL: // sample fp an IMediaSample
63 case MEDIA_TYPE_TEXT: // sample fp an IMediatextSample for timed text
64 {
65 if (_firstEntry)
66 {
67 _currentTimestamp = ts;
68 _firstEntry = false;
69 }
70 else
71 {
72 // Calculate delta
73 int32 delta = ts - _currentTimestamp;
74 _currentTimestamp = ts;
75
76 // Add entry to table
77 addDelta(delta);
78 }
79 }
80 break;
81
82 case MEDIA_TYPE_UNKNOWN:
83 default:
84 break;
85 }
86 }
87
88 // in movie fragment mode set the actual duration of
89 // last sample
90 void
updateLastTSEntry(uint32 ts)91 PVA_FF_TimeToSampleAtom::updateLastTSEntry(uint32 ts)
92 {
93 if (((uint32) _mediaType == MEDIA_TYPE_AUDIO) ||
94 ((uint32) _mediaType == MEDIA_TYPE_VISUAL))
95 {
96 int32 delta = ts - _currentTimestamp;
97 addDelta(delta);
98 }
99
100 _lastTSUpdated = true;
101 }
102
103 // Add delta to the table - logic contained within if shoudl just update table entries
104 // or if should add new entries
105 void
addDelta(int32 delta)106 PVA_FF_TimeToSampleAtom::addDelta(int32 delta)
107 {
108 // Entries are calculated as difference between current ts and previous ts. Therefore
109 // the first entry to the table fp made when the second sample fp received
110 if (_entryCount == 0)
111 {
112 // Add first delta entry
113 addEntry(1, delta);
114 }
115 else
116 {
117 int32 lastDelta = (*_psampleDeltaVec)[_entryCount - 1];
118 if (delta == lastDelta)
119 {
120 // Only need to replace count entry (increment it)
121 uint32 count = (*_psampleCountVec)[_entryCount - 1];
122 _psampleCountVec->pop_back();
123 _psampleCountVec->push_back(count + 1); // incrementing count
124 }
125 else
126 {
127 // deltas differ - add new entry
128 addEntry(1, delta);
129 }
130 }
131 }
132
133 // Add entry to the vector
134 void
addEntry(uint32 count,int32 delta)135 PVA_FF_TimeToSampleAtom::addEntry(uint32 count, int32 delta)
136 {
137 _psampleDeltaVec->push_back(delta);
138 _psampleCountVec->push_back(count);
139 _entryCount++;
140 recomputeSize();
141 }
142
143
144 // Rendering the PVA_FF_Atom in proper format (bitlengths, etc.) to an ostream
145 bool
renderToFileStream(MP4_AUTHOR_FF_FILE_IO_WRAP * fp)146 PVA_FF_TimeToSampleAtom::renderToFileStream(MP4_AUTHOR_FF_FILE_IO_WRAP *fp)
147 {
148 int32 rendered = 0;
149
150 if (!renderAtomBaseMembers(fp))
151 {
152 return false;
153 }
154 rendered += getDefaultSize();
155
156 // This is required to comply with w3850 Sec 13.2.3.16
157 // "Note that the time to sample atoms must give durations for all
158 // samples including the last one"
159 if (_lastTSUpdated == false)
160 {
161 if (_entryCount > 0)
162 {
163 (*_psampleCountVec)[_entryCount - 1] += 1;
164 }
165 }
166
167 if (!PVA_FF_AtomUtils::render32(fp, getEntryCount()))
168 {
169 return false;
170 }
171 rendered += 4;
172
173 // Render the vectors of counts and deltas
174 if ((_psampleCountVec->size() < _entryCount) ||
175 (_psampleDeltaVec->size() < _entryCount))
176 {
177 return false;
178 }
179 for (uint32 i = 0; i < _entryCount; i++)
180 {
181 if (!PVA_FF_AtomUtils::render32(fp, (*_psampleCountVec)[i]))
182 {
183 return false;
184 }
185 if (!PVA_FF_AtomUtils::render32(fp, (*_psampleDeltaVec)[i]))
186 {
187 return false;
188 }
189 rendered += 8;
190 }
191
192 return true;
193 }
194
195
196 void
recomputeSize()197 PVA_FF_TimeToSampleAtom::recomputeSize()
198 {
199 // Include size of all base atom members
200 int32 size = getDefaultSize();
201
202 size += 4; // For entryCount
203
204 // Inlclude size of entries in vectors
205 for (uint32 i = 0; i < _entryCount; i++)
206 {
207 size += 8;
208 }
209
210 _size = size;
211
212 // Update the size of the parent atom
213 if (_pparent != NULL)
214 {
215 _pparent->recomputeSize();
216 }
217 }
218