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
|
#include <lib/dvb/tstools.h>
#include <lib/base/eerror.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
eDVBTSTools::eDVBTSTools()
{
m_fd = -1;
m_pid = -1;
m_maxrange = 256*1024;
m_begin_valid = 0;
m_end_valid = 0;
}
eDVBTSTools::~eDVBTSTools()
{
closeFile();
}
int eDVBTSTools::openFile(const char *filename)
{
closeFile();
m_fd = ::open(filename, O_RDONLY);
if (m_fd < 0)
return -1;
return 0;
}
void eDVBTSTools::closeFile()
{
if (m_fd >= 0)
::close(m_fd);
}
void eDVBTSTools::setSyncPID(int pid)
{
m_pid = pid;
}
void eDVBTSTools::setSearchRange(int maxrange)
{
m_maxrange = maxrange;
}
int eDVBTSTools::getPTS(off_t &offset, pts_t &pts)
{
if (m_fd < 0)
return -1;
offset -= offset % 188;
// TODO: multiple files!
if (lseek(m_fd, offset, SEEK_SET) < 0)
return -1;
int left = m_maxrange;
while (left >= 188)
{
unsigned char block[188];
if (read(m_fd, block, 188) != 188)
break;
left -= 188;
offset += 188;
if (block[0] != 0x47)
{
int i = 0;
while (i < 188)
{
if (block[i] == 0x47)
break;
++i;
}
offset = lseek(m_fd, i - 188, SEEK_CUR);
continue;
}
int pid = ((block[1] << 8) | block[2]) & 0x1FFF;
int pusi = !!(block[1] & 0x40);
// printf("PID %04x, PUSI %d\n", pid, pusi);
if (m_pid >= 0)
if (pid != m_pid)
continue;
if (!pusi)
continue;
/* ok, now we have a PES header */
unsigned char *pes;
/* check for adaption field */
if (block[3] & 0x20)
pes = block + block[4] + 4 + 1;
else
pes = block + 4;
/* somehow not a startcode. (this is invalid, since pusi was set.) ignore it. */
if (pes[0] || pes[1] || (pes[2] != 1))
continue;
if (pes[7] & 0x80) /* PTS */
{
pts = ((unsigned long long)(pes[ 9]&0xE)) << 29;
pts |= ((unsigned long long)(pes[10]&0xFF)) << 22;
pts |= ((unsigned long long)(pes[11]&0xFE)) << 14;
pts |= ((unsigned long long)(pes[12]&0xFF)) << 7;
pts |= ((unsigned long long)(pes[13]&0xFE)) >> 1;
offset -= 188;
return 0;
}
}
return -1;
}
void eDVBTSTools::calcBegin()
{
if (m_fd < 0)
return;
if (!m_begin_valid)
{
m_offset_begin = 0;
if (!getPTS(m_offset_begin, m_pts_begin))
m_begin_valid = 1;
}
}
void eDVBTSTools::calcEnd()
{
if (m_fd < 0)
return;
m_offset_end = lseek(m_fd, 0, SEEK_END);
int maxiter = 10;
while (!m_end_valid)
{
if (!--maxiter)
return;
m_offset_end -= m_maxrange;
if (m_offset_end < 0)
m_offset_end = 0;
if (!getPTS(m_offset_end, m_pts_end))
m_end_valid = 1;
if (!m_offset_end)
return;
}
}
int eDVBTSTools::calcLen(pts_t &len)
{
calcBegin(); calcEnd();
if (!(m_begin_valid && m_end_valid))
return -1;
len = m_pts_end - m_pts_begin;
return 0;
}
int eDVBTSTools::calcBitrate()
{
calcBegin(); calcEnd();
if (!(m_begin_valid && m_end_valid))
return -1;
pts_t len_in_pts = m_pts_end - m_pts_begin;
off_t len_in_bytes = m_offset_end - m_offset_begin;
if (!len_in_pts)
return -1;
unsigned long long bitrate = len_in_bytes * 90000 * 8 / len_in_pts;
if ((bitrate < 10000) || (bitrate > 100000000))
return -1;
return bitrate;
}
|
