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
|
/*
* HLSStreams.cpp
*****************************************************************************
* Copyright (C) 2015 - VideoLAN and VLC authors
*
* This program 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.
*
* This program 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 program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "HLSStreams.hpp"
#include "../adaptive/tools/Conversions.hpp"
#include <vlc_demux.h>
#include <vlc_meta.h>
#include <limits>
extern "C"
{
#include "../../meta_engine/ID3Tag.h"
#include "../../meta_engine/ID3Meta.h"
}
using namespace hls;
HLSStream::HLSStream(demux_t *demux)
: AbstractStream(demux)
{
p_meta = vlc_meta_New();
b_meta_updated = false;
}
HLSStream::~HLSStream()
{
if(p_meta)
vlc_meta_Delete(p_meta);
}
void HLSStream::setMetadataTimeOffset(vlc_tick_t i_offset)
{
if(i_offset >= 0)
fakeEsOut()->setAssociatedTimestamp(i_offset);
else
fakeEsOut()->setAssociatedTimestamp(-1);
}
void HLSStream::setMetadataTimeMapping(vlc_tick_t mpegts, vlc_tick_t muxed)
{
fakeEsOut()->setAssociatedTimestamp(mpegts, muxed);
}
void HLSStream::trackerEvent(const TrackerEvent &e)
{
AbstractStream::trackerEvent(e);
if(e.getType() == TrackerEvent::Type::FormatChange)
{
if(format == StreamFormat::Type::WebVTT)
{
contiguous = false;
}
else if(format == StreamFormat::Type::Unknown)
{
const Role r = segmentTracker->getStreamRole();
contiguous = !(r == Role::Value::Caption || r == Role::Value::Subtitle);
}
else contiguous = true;
}
}
int HLSStream::ParseID3PrivTag(const uint8_t *p_payload, size_t i_payload)
{
if(i_payload == 53 &&
!memcmp( p_payload, "com.apple.streaming.transportStreamTimestamp", 45))
{
setMetadataTimeOffset(GetQWBE(&p_payload[45]) * 100 / 9);
}
return VLC_SUCCESS;
}
int HLSStream::ParseID3Tag(uint32_t i_tag, const uint8_t *p_payload, size_t i_payload)
{
if(i_tag == VLC_FOURCC('P','R','I','V'))
(void) ParseID3PrivTag(p_payload, i_payload);
else
(void) ID3HandleTag(p_payload, i_payload, i_tag, p_meta, &b_meta_updated);
return VLC_SUCCESS;
}
int HLSStream::ID3TAG_Parse_Handler(uint32_t i_tag, const uint8_t *p_payload, size_t i_payload, void *p_priv)
{
HLSStream *hlsstream = static_cast<HLSStream *>(p_priv);
return hlsstream->ParseID3Tag(i_tag, p_payload, i_payload);
}
block_t * HLSStream::checkBlock(block_t *p_block, bool b_first)
{
if(b_first && p_block)
{
while(p_block->i_buffer >= 10 && ID3TAG_IsTag(p_block->p_buffer, false))
{
size_t i_size = ID3TAG_Parse( p_block->p_buffer, p_block->i_buffer,
ID3TAG_Parse_Handler, static_cast<void *>(this) );
if(i_size >= p_block->i_buffer || i_size == 0)
break;
/* Skip ID3 for demuxer */
p_block->p_buffer += i_size;
p_block->i_buffer -= i_size;
}
}
if(b_first && p_block && format == StreamFormat::Type::WebVTT && p_block->i_buffer > 7)
{
/* "WEBVTT\n"
"X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:2147483647\n" */
const char *p = (const char *) p_block->p_buffer;
const char *end = p + p_block->i_buffer;
p = strnstr(p + 7, "X-TIMESTAMP-MAP=", p_block->i_buffer - 7);
if(p)
{
const char *eol = (const char *) memchr(p, '\n', end - p);
if(eol)
{
uint64_t mpegts = std::numeric_limits<uint64_t>::max();
vlc_tick_t local = std::numeric_limits<mtime_t>::max();
std::string str(p + 16, eol - p - 16);
std::string::size_type pos = str.find("LOCAL:");
if(pos != std::string::npos && str.length() - pos >= 12+6)
local = UTCTime("T" + str.substr(pos + 6, 12)).mtime();
pos = str.find("MPEGTS:");
if(pos != std::string::npos && str.size() - pos > 7)
{
pos += 7;
std::string::size_type tail = str.find_last_not_of("0123456789", pos);
mpegts = Integer<uint64_t>(str.substr(pos, (tail != std::string::npos) ? tail - pos : tail));
}
if(mpegts != std::numeric_limits<uint64_t>::max() &&
local != std::numeric_limits<mtime_t>::max())
{
setMetadataTimeMapping(VLC_TICK_0 + mpegts * 100/9, VLC_TICK_0 + local);
}
}
}
}
if( b_meta_updated )
{
b_meta_updated = false;
AbstractCommand *command = fakeEsOut()->commandsFactory()->createEsOutMetaCommand( fakeesout, -1, p_meta );
if( command )
fakeEsOut()->commandsQueue()->Schedule( command );
}
return p_block;
}
AbstractDemuxer *HLSStream::newDemux(vlc_object_t *p_obj, const StreamFormat &format,
es_out_t *out, AbstractSourceStream *source) const
{
AbstractDemuxer *ret = nullptr;
switch(format)
{
case StreamFormat::Type::PackedAAC:
ret = new Demuxer(p_obj, "aac", out, source); /* "es" demuxer cannot probe AAC, need to force */
break;
case StreamFormat::Type::PackedMP3: /* MPGA / MP3, needs "es" to probe: do not force */
case StreamFormat::Type::PackedAC3: /* AC3 / E-AC3, needs "es" to probe: do not force */
ret = new Demuxer(p_obj, "es", out, source);
break;
case StreamFormat::Type::MPEG2TS:
ret = new Demuxer(p_obj, "ts", out, source);
if(ret)
ret->setBitstreamSwitchCompatible(false); /* HLS and unique PAT/PMT versions */
break;
case StreamFormat::Type::MP4:
ret = AbstractStream::newDemux(p_obj, format, out, source);
break;
case StreamFormat::Type::Ogg:
ret = new Demuxer(p_obj, "ogg", out, source);
break;
case StreamFormat::Type::WebVTT:
ret = new Demuxer(p_obj, "webvttstream", out, source);
if(ret)
ret->setRestartsOnEachSegment(true);
break;
default:
case StreamFormat::Type::Unknown:
case StreamFormat::Type::Unsupported:
break;
}
return ret;
}
AbstractStream * HLSStreamFactory::create(demux_t *realdemux, const StreamFormat &format,
SegmentTracker *tracker) const
{
HLSStream *stream = new (std::nothrow) HLSStream(realdemux);
if(stream && !stream->init(format, tracker))
{
delete stream;
return nullptr;
}
return stream;
}
|
