1/*
2 *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#include "webrtc/voice_engine/channel_manager.h"
12
13#include "webrtc/common.h"
14#include "webrtc/voice_engine/channel.h"
15
16namespace webrtc {
17namespace voe {
18
19ChannelOwner::ChannelOwner(class Channel* channel)
20    : channel_ref_(new ChannelRef(channel)) {}
21
22ChannelOwner::ChannelOwner(const ChannelOwner& channel_owner)
23    : channel_ref_(channel_owner.channel_ref_) {
24  ++channel_ref_->ref_count;
25}
26
27ChannelOwner::~ChannelOwner() {
28  if (--channel_ref_->ref_count == 0)
29    delete channel_ref_;
30}
31
32ChannelOwner& ChannelOwner::operator=(const ChannelOwner& other) {
33  if (other.channel_ref_ == channel_ref_)
34    return *this;
35
36  if (--channel_ref_->ref_count == 0)
37    delete channel_ref_;
38
39  channel_ref_ = other.channel_ref_;
40  ++channel_ref_->ref_count;
41
42  return *this;
43}
44
45ChannelOwner::ChannelRef::ChannelRef(class Channel* channel)
46    : channel(channel), ref_count(1) {}
47
48ChannelManager::ChannelManager(uint32_t instance_id, const Config& config)
49    : instance_id_(instance_id),
50      last_channel_id_(-1),
51      lock_(CriticalSectionWrapper::CreateCriticalSection()),
52      config_(config),
53      event_log_(RtcEventLog::Create()) {}
54
55ChannelOwner ChannelManager::CreateChannel() {
56  return CreateChannelInternal(config_);
57}
58
59ChannelOwner ChannelManager::CreateChannel(const Config& external_config) {
60  return CreateChannelInternal(external_config);
61}
62
63ChannelOwner ChannelManager::CreateChannelInternal(const Config& config) {
64  Channel* channel;
65  Channel::CreateChannel(channel, ++last_channel_id_, instance_id_,
66                         event_log_.get(), config);
67  ChannelOwner channel_owner(channel);
68
69  CriticalSectionScoped crit(lock_.get());
70
71  channels_.push_back(channel_owner);
72
73  return channel_owner;
74}
75
76ChannelOwner ChannelManager::GetChannel(int32_t channel_id) {
77  CriticalSectionScoped crit(lock_.get());
78
79  for (size_t i = 0; i < channels_.size(); ++i) {
80    if (channels_[i].channel()->ChannelId() == channel_id)
81      return channels_[i];
82  }
83  return ChannelOwner(NULL);
84}
85
86void ChannelManager::GetAllChannels(std::vector<ChannelOwner>* channels) {
87  CriticalSectionScoped crit(lock_.get());
88
89  *channels = channels_;
90}
91
92void ChannelManager::DestroyChannel(int32_t channel_id) {
93  assert(channel_id >= 0);
94  // Holds a reference to a channel, this is used so that we never delete
95  // Channels while holding a lock, but rather when the method returns.
96  ChannelOwner reference(NULL);
97  {
98    CriticalSectionScoped crit(lock_.get());
99    std::vector<ChannelOwner>::iterator to_delete = channels_.end();
100    for (auto it = channels_.begin(); it != channels_.end(); ++it) {
101      Channel* channel = it->channel();
102      // For channels associated with the channel to be deleted, disassociate
103      // with that channel.
104      channel->DisassociateSendChannel(channel_id);
105
106      if (channel->ChannelId() == channel_id) {
107        to_delete = it;
108      }
109    }
110    if (to_delete != channels_.end()) {
111      reference = *to_delete;
112      channels_.erase(to_delete);
113    }
114  }
115}
116
117void ChannelManager::DestroyAllChannels() {
118  // Holds references so that Channels are not destroyed while holding this
119  // lock, but rather when the method returns.
120  std::vector<ChannelOwner> references;
121  {
122    CriticalSectionScoped crit(lock_.get());
123    references = channels_;
124    channels_.clear();
125  }
126}
127
128size_t ChannelManager::NumOfChannels() const {
129  CriticalSectionScoped crit(lock_.get());
130  return channels_.size();
131}
132
133RtcEventLog* ChannelManager::GetEventLog() const {
134  return event_log_.get();
135}
136
137ChannelManager::Iterator::Iterator(ChannelManager* channel_manager)
138    : iterator_pos_(0) {
139  channel_manager->GetAllChannels(&channels_);
140}
141
142Channel* ChannelManager::Iterator::GetChannel() {
143  if (iterator_pos_ < channels_.size())
144    return channels_[iterator_pos_].channel();
145  return NULL;
146}
147
148bool ChannelManager::Iterator::IsValid() {
149  return iterator_pos_ < channels_.size();
150}
151
152void ChannelManager::Iterator::Increment() {
153  ++iterator_pos_;
154}
155
156}  // namespace voe
157}  // namespace webrtc
158