1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
/*****************************************************************
|
| AP4 - Synthetic Sample Table
|
| Copyright 2002-2008 Axiomatic Systems, LLC
|
|
| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
| Unless you have obtained Bento4 under a difference license,
| this version of Bento4 is Bento4|GPL.
| Bento4|GPL is free software; you can redistribute it and/or modify
| it under the terms of the GNU General Public License as published by
| the Free Software Foundation; either version 2, or (at your option)
| any later version.
|
| Bento4|GPL is distributed in the hope that it will be useful,
| but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| GNU General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with Bento4|GPL; see the file COPYING. If not, write to the
| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
| 02111-1307, USA.
|
****************************************************************/
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include "Ap4Types.h"
#include "Ap4Atom.h"
#include "Ap4SyntheticSampleTable.h"
#include "Ap4Sample.h"
/*----------------------------------------------------------------------
| AP4_SyntheticSampleTable::AP4_SyntheticSampleTable()
+---------------------------------------------------------------------*/
AP4_SyntheticSampleTable::AP4_SyntheticSampleTable(AP4_Cardinal chunk_size) :
m_ChunkSize(chunk_size?chunk_size:AP4_SYNTHETIC_SAMPLE_TABLE_DEFAULT_CHUNK_SIZE)
{
m_LookupCache.m_Sample = 0;
m_LookupCache.m_Chunk = 0;
}
/*----------------------------------------------------------------------
| AP4_SyntheticSampleTable::~AP4_SyntheticSampleTable()
+---------------------------------------------------------------------*/
AP4_SyntheticSampleTable::~AP4_SyntheticSampleTable()
{
m_SampleDescriptions.DeleteReferences();
}
/*----------------------------------------------------------------------
| AP4_SyntheticSampleTable::GetSample
+---------------------------------------------------------------------*/
AP4_Result
AP4_SyntheticSampleTable::GetSample(AP4_Ordinal sample_index, AP4_Sample& sample)
{
if (sample_index >= m_Samples.ItemCount()) return AP4_ERROR_OUT_OF_RANGE;
sample = m_Samples[sample_index];
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_SyntheticSampleTable::GetSampleCount
+---------------------------------------------------------------------*/
AP4_Cardinal
AP4_SyntheticSampleTable::GetSampleCount()
{
return m_Samples.ItemCount();
}
/*----------------------------------------------------------------------
| AP4_SyntheticSampleTable::GetSampleChunkPosition
+---------------------------------------------------------------------*/
AP4_Result
AP4_SyntheticSampleTable::GetSampleChunkPosition(
AP4_Ordinal sample_index,
AP4_Ordinal& chunk_index,
AP4_Ordinal& position_in_chunk)
{
// default values
chunk_index = 0;
position_in_chunk = 0;
// check parameters
if (sample_index >= m_Samples.ItemCount()) return AP4_ERROR_OUT_OF_RANGE;
// look for the chunk
AP4_Ordinal sample_cursor = 0;
AP4_Ordinal chunk_cursor = 0;
if (sample_index >= m_LookupCache.m_Sample) {
sample_cursor = m_LookupCache.m_Sample;
chunk_cursor = m_LookupCache.m_Chunk;
}
for (;
chunk_cursor < m_SamplesInChunk.ItemCount();
sample_cursor += m_SamplesInChunk[chunk_cursor++]) {
if (sample_cursor+m_SamplesInChunk[chunk_cursor] > sample_index) {
chunk_index = chunk_cursor;
position_in_chunk = sample_index-sample_cursor;
m_LookupCache.m_Sample = sample_cursor;
m_LookupCache.m_Chunk = chunk_cursor;
return AP4_SUCCESS;
}
}
return AP4_ERROR_OUT_OF_RANGE;
}
/*----------------------------------------------------------------------
| AP4_SyntheticSampleTable::GetSampleDescriptionCount
+---------------------------------------------------------------------*/
AP4_Cardinal
AP4_SyntheticSampleTable::GetSampleDescriptionCount()
{
return m_SampleDescriptions.ItemCount();
}
/*----------------------------------------------------------------------
| AP4_SyntheticSampleTable::GetSampleDescription
+---------------------------------------------------------------------*/
AP4_SampleDescription*
AP4_SyntheticSampleTable::GetSampleDescription(AP4_Ordinal index)
{
SampleDescriptionHolder* holder;
if (AP4_SUCCEEDED(m_SampleDescriptions.Get(index, holder))) {
return holder->m_SampleDescription;
} else {
return NULL;
}
}
/*----------------------------------------------------------------------
| AP4_SyntheticSampleTable::AddSampleDescription
+---------------------------------------------------------------------*/
AP4_Result
AP4_SyntheticSampleTable::AddSampleDescription(AP4_SampleDescription* description,
bool transfer_ownership)
{
return m_SampleDescriptions.Add(new SampleDescriptionHolder(description, transfer_ownership));
}
/*----------------------------------------------------------------------
| AP4_SyntheticSampleTable::AddSample
+---------------------------------------------------------------------*/
AP4_Result
AP4_SyntheticSampleTable::AddSample(AP4_ByteStream& data_stream,
AP4_Position offset,
AP4_Size size,
AP4_UI32 duration,
AP4_Ordinal description_index,
AP4_UI64 dts,
AP4_UI32 cts_delta,
bool sync)
{
// decide if we need to start a new chunk or increment the last one
if (m_SamplesInChunk.ItemCount() == 0 ||
m_SamplesInChunk[m_SamplesInChunk.ItemCount()-1] >= m_ChunkSize ||
m_Samples.ItemCount() == 0 ||
m_Samples[m_Samples.ItemCount()-1].GetDescriptionIndex() != description_index) {
m_SamplesInChunk.Append(1);
} else {
++m_SamplesInChunk[m_SamplesInChunk.ItemCount()-1];
}
// compute the timestamps
if (m_Samples.ItemCount() > 0) {
AP4_Sample* prev_sample = &m_Samples[m_Samples.ItemCount()-1];
if (dts == 0) {
if (prev_sample->GetDuration() == 0) {
// can't compute the DTS for this sample
return AP4_ERROR_INVALID_PARAMETERS;
}
dts = prev_sample->GetDts()+prev_sample->GetDuration();
} else {
if (prev_sample->GetDuration() == 0) {
// update the previous sample
if (dts <= prev_sample->GetDts()) {
return AP4_ERROR_INVALID_PARAMETERS;
}
prev_sample->SetDuration((AP4_UI32)(dts-prev_sample->GetDts()));
} else {
if (dts != prev_sample->GetDts()+prev_sample->GetDuration()) {
// mismatch
return AP4_ERROR_INVALID_PARAMETERS;
}
}
}
}
// add the sample to the table
AP4_Sample sample(data_stream, offset, size, duration, description_index, dts, cts_delta, sync);
return m_Samples.Append(sample);
}
/*----------------------------------------------------------------------
| AP4_SyntheticSampleTable::AddSample
+---------------------------------------------------------------------*/
AP4_Result
AP4_SyntheticSampleTable::AddSample(const AP4_Sample& sample)
{
return m_Samples.Append(sample);
}
/*----------------------------------------------------------------------
| AP4_SyntheticSampleTable::GetSampleIndexForTimeStamp
+---------------------------------------------------------------------*/
AP4_Result
AP4_SyntheticSampleTable::GetSampleIndexForTimeStamp(AP4_UI64 /* ts */,
AP4_Ordinal& /* index */)
{
return AP4_ERROR_NOT_SUPPORTED;
}
/*----------------------------------------------------------------------
| AP4_SyntheticSampleTable::GetNearestSyncSampleIndex
+---------------------------------------------------------------------*/
AP4_Ordinal
AP4_SyntheticSampleTable::GetNearestSyncSampleIndex(AP4_Ordinal sample_index, bool before)
{
if (before) {
for (int i=sample_index; i>=0; i--) {
if (m_Samples[i].IsSync()) return i;
}
// not found?
return 0;
} else {
AP4_Cardinal entry_count = m_Samples.ItemCount();
for (unsigned int i=sample_index; i<entry_count; i++) {
if (m_Samples[i].IsSync()) return i;
}
// not found?
return m_Samples.ItemCount();
}
}
|
