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
|
/**********
This library is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the
Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
This library 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 Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
**********/
// "liveMedia"
// Copyright (c) 1996-2005 Live Networks, Inc. All rights reserved.
// MP3 File Sources
// Implementation
#include "MP3FileSource.hh"
#include "MP3StreamState.hh"
#include "InputFile.hh"
////////// MP3FileSource //////////
MP3FileSource::MP3FileSource(UsageEnvironment& env, FILE* fid)
: FramedFileSource(env, fid),
fStreamState(new MP3StreamState(env)) {
}
MP3FileSource::~MP3FileSource() {
delete fStreamState;
}
char const* MP3FileSource::MIMEtype() const {
return "audio/MPEG";
}
MP3FileSource* MP3FileSource::createNew(UsageEnvironment& env, char const* fileName) {
MP3FileSource* newSource = NULL;
do {
FILE* fid;
fid = OpenInputFile(env, fileName);
if (fid == NULL) break;
newSource = new MP3FileSource(env, fid);
if (newSource == NULL) break;
unsigned fileSize = (unsigned)GetFileSize(fileName, fid);
newSource->assignStream(fid, fileSize);
if (!newSource->initializeStream()) break;
return newSource;
} while (0);
Medium::close(newSource);
return NULL;
}
float MP3FileSource::filePlayTime() const {
return fStreamState->filePlayTime();
}
void MP3FileSource::setPresentationTimeScale(unsigned scale) {
fStreamState->setPresentationTimeScale(scale);
}
void MP3FileSource::seekWithinFile(float seekNPT) {
fStreamState->seekWithinFile(seekNPT);
}
void MP3FileSource::getAttributes() const {
char buffer[200];
fStreamState->getAttributes(buffer, sizeof buffer);
envir().setResultMsg(buffer);
}
void MP3FileSource::doGetNextFrame() {
if (!doGetNextFrame1()) {
handleClosure(this);
return;
}
// Switch to another task:
#if defined(__WIN32__) || defined(_WIN32)
// HACK: liveCaster/lc uses an implementation of scheduleDelayedTask()
// that performs very badly (chewing up lots of CPU time, apparently polling)
// on Windows. Until this is fixed, we just call our "afterGetting()"
// function directly. This avoids infinite recursion, as long as our sink
// is discontinuous, which is the case for the RTP sink that liveCaster/lc
// uses. #####
afterGetting(this);
#else
nextTask() = envir().taskScheduler().scheduleDelayedTask(0,
(TaskFunc*)afterGetting, this);
#endif
}
Boolean MP3FileSource::doGetNextFrame1() {
if (!fHaveJustInitialized) {
if (fStreamState->findNextHeader(fPresentationTime) == 0) return False;
} else {
fPresentationTime = fFirstFramePresentationTime;
fHaveJustInitialized = False;
}
if (!fStreamState->readFrame(fTo, fMaxSize, fFrameSize, fDurationInMicroseconds)) {
char tmp[200];
sprintf(tmp,
"Insufficient buffer size %d for reading MPEG audio frame (needed %d)\n",
fMaxSize, fFrameSize);
envir().setResultMsg(tmp);
fFrameSize = fMaxSize;
return False;
}
return True;
}
void MP3FileSource::assignStream(FILE* fid, unsigned fileSize) {
fStreamState->assignStream(fid, fileSize);
}
Boolean MP3FileSource::initializeStream() {
// Make sure the file has an appropriate header near the start:
if (fStreamState->findNextHeader(fFirstFramePresentationTime) == 0) {
envir().setResultMsg("not an MPEG audio file");
return False;
}
fStreamState->checkForXingHeader(); // in case this is a VBR file
fHaveJustInitialized = True;
// Hack: It's possible that our environment's 'result message' has been
// reset within this function, so set it again to our name now:
envir().setResultMsg(name());
return True;
}
|
