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// Copyright (c) 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/renderer/media/webrtc/webrtc_media_stream_adapter_map.h"
namespace content {
WebRtcMediaStreamAdapterMap::AdapterEntry::AdapterEntry(
std::unique_ptr<WebRtcMediaStreamAdapter> adapter)
: adapter(std::move(adapter)), ref_count(0) {
DCHECK(this->adapter);
}
WebRtcMediaStreamAdapterMap::AdapterEntry::AdapterEntry(AdapterEntry&& other)
: adapter(other.adapter.release()), ref_count(other.ref_count) {}
WebRtcMediaStreamAdapterMap::AdapterEntry::~AdapterEntry() {
// |ref_count| is allowed to be non-zero only if this entry has been moved
// which is the case if the |adapter| has already been released.
DCHECK(!ref_count || !adapter);
}
WebRtcMediaStreamAdapterMap::AdapterRef::AdapterRef(
scoped_refptr<WebRtcMediaStreamAdapterMap> map,
Type type,
AdapterEntry* adapter_entry)
: map_(std::move(map)), type_(type), adapter_entry_(adapter_entry) {
DCHECK(map_);
DCHECK(adapter_entry_);
map_->lock_.AssertAcquired();
++adapter_entry_->ref_count;
}
WebRtcMediaStreamAdapterMap::AdapterRef::~AdapterRef() {
DCHECK(map_->main_thread_->BelongsToCurrentThread());
std::unique_ptr<WebRtcMediaStreamAdapter> removed_adapter;
{
base::AutoLock scoped_lock(map_->lock_);
--adapter_entry_->ref_count;
if (adapter_entry_->ref_count == 0) {
removed_adapter = std::move(adapter_entry_->adapter);
// "GetOrCreate..." ensures the adapter is initialized and the secondary
// key is set before the last |AdapterRef| is destroyed. We can use either
// the primary or secondary key for removal.
if (type_ == Type::kLocal) {
map_->local_stream_adapters_.EraseByPrimary(
removed_adapter->web_stream().UniqueId());
} else {
map_->remote_stream_adapters_.EraseByPrimary(
removed_adapter->webrtc_stream().get());
}
}
}
// Destroy the adapter whilst not holding the lock so that it is safe for
// destructors to use the signaling thread synchronously without any risk of
// deadlock.
removed_adapter.reset();
}
std::unique_ptr<WebRtcMediaStreamAdapterMap::AdapterRef>
WebRtcMediaStreamAdapterMap::AdapterRef::Copy() const {
base::AutoLock scoped_lock(map_->lock_);
return base::WrapUnique(new AdapterRef(map_, type_, adapter_entry_));
}
WebRtcMediaStreamAdapterMap::WebRtcMediaStreamAdapterMap(
PeerConnectionDependencyFactory* const factory,
scoped_refptr<base::SingleThreadTaskRunner> main_thread,
scoped_refptr<WebRtcMediaStreamTrackAdapterMap> track_adapter_map)
: factory_(factory),
main_thread_(std::move(main_thread)),
track_adapter_map_(std::move(track_adapter_map)) {
DCHECK(factory_);
DCHECK(main_thread_);
DCHECK(track_adapter_map_);
}
WebRtcMediaStreamAdapterMap::~WebRtcMediaStreamAdapterMap() {
DCHECK(main_thread_->BelongsToCurrentThread());
DCHECK(local_stream_adapters_.empty());
}
std::unique_ptr<WebRtcMediaStreamAdapterMap::AdapterRef>
WebRtcMediaStreamAdapterMap::GetLocalStreamAdapter(
const blink::WebMediaStream& web_stream) {
base::AutoLock scoped_lock(lock_);
AdapterEntry* adapter_entry =
local_stream_adapters_.FindByPrimary(web_stream.UniqueId());
if (!adapter_entry)
return nullptr;
return base::WrapUnique(
new AdapterRef(this, AdapterRef::Type::kLocal, adapter_entry));
}
std::unique_ptr<WebRtcMediaStreamAdapterMap::AdapterRef>
WebRtcMediaStreamAdapterMap::GetLocalStreamAdapter(
webrtc::MediaStreamInterface* webrtc_stream) {
base::AutoLock scoped_lock(lock_);
AdapterEntry* adapter_entry =
local_stream_adapters_.FindBySecondary(webrtc_stream);
if (!adapter_entry)
return nullptr;
return base::WrapUnique(
new AdapterRef(this, AdapterRef::Type::kLocal, adapter_entry));
}
std::unique_ptr<WebRtcMediaStreamAdapterMap::AdapterRef>
WebRtcMediaStreamAdapterMap::GetOrCreateLocalStreamAdapter(
const blink::WebMediaStream& web_stream) {
DCHECK(main_thread_->BelongsToCurrentThread());
base::AutoLock scoped_lock(lock_);
AdapterEntry* adapter_entry =
local_stream_adapters_.FindByPrimary(web_stream.UniqueId());
if (!adapter_entry) {
std::unique_ptr<WebRtcMediaStreamAdapter> adapter;
{
// Make sure we don't hold the lock while calling out to
// CreateLocalStreamAdapter(). The reason is that constructing a local
// stream adapter, will synchronize with WebRTC's signaling thread and
// callbacks on the signaling thread might end up coming back to us
// and we might need the lock then.
base::AutoUnlock scoped_unlock(lock_);
adapter = WebRtcMediaStreamAdapter::CreateLocalStreamAdapter(
factory_, track_adapter_map_, web_stream);
}
adapter_entry = local_stream_adapters_.Insert(web_stream.UniqueId(),
std::move(adapter));
DCHECK(adapter_entry->adapter->is_initialized());
local_stream_adapters_.SetSecondaryKey(
web_stream.UniqueId(), adapter_entry->adapter->webrtc_stream().get());
}
return base::WrapUnique(
new AdapterRef(this, AdapterRef::Type::kLocal, adapter_entry));
}
size_t WebRtcMediaStreamAdapterMap::GetLocalStreamCount() const {
base::AutoLock scoped_lock(lock_);
return local_stream_adapters_.PrimarySize();
}
std::unique_ptr<WebRtcMediaStreamAdapterMap::AdapterRef>
WebRtcMediaStreamAdapterMap::GetRemoteStreamAdapter(
const blink::WebMediaStream& web_stream) {
base::AutoLock scoped_lock(lock_);
AdapterEntry* adapter_entry =
remote_stream_adapters_.FindBySecondary(web_stream.UniqueId());
if (!adapter_entry)
return nullptr;
return base::WrapUnique(
new AdapterRef(this, AdapterRef::Type::kRemote, adapter_entry));
}
std::unique_ptr<WebRtcMediaStreamAdapterMap::AdapterRef>
WebRtcMediaStreamAdapterMap::GetRemoteStreamAdapter(
webrtc::MediaStreamInterface* webrtc_stream) {
base::AutoLock scoped_lock(lock_);
AdapterEntry* adapter_entry =
remote_stream_adapters_.FindByPrimary(webrtc_stream);
if (!adapter_entry)
return nullptr;
return base::WrapUnique(
new AdapterRef(this, AdapterRef::Type::kRemote, adapter_entry));
}
std::unique_ptr<WebRtcMediaStreamAdapterMap::AdapterRef>
WebRtcMediaStreamAdapterMap::GetOrCreateRemoteStreamAdapter(
scoped_refptr<webrtc::MediaStreamInterface> webrtc_stream) {
DCHECK(!main_thread_->BelongsToCurrentThread());
DCHECK(webrtc_stream);
base::AutoLock scoped_lock(lock_);
AdapterEntry* adapter_entry =
remote_stream_adapters_.FindByPrimary(webrtc_stream.get());
if (!adapter_entry) {
// Make sure we don't hold the lock while calling out to
// CreateRemoteStreamAdapter(). The reason is that it might synchronize
// with other threads, possibly the main thread, where we might need to grab
// the lock (e.g. inside of GetOrCreateLocalStreamAdapter()).
std::unique_ptr<WebRtcMediaStreamAdapter> adapter;
{
base::AutoUnlock scoped_unlock(lock_);
adapter = WebRtcMediaStreamAdapter::CreateRemoteStreamAdapter(
main_thread_, track_adapter_map_, webrtc_stream.get());
}
adapter_entry =
remote_stream_adapters_.Insert(webrtc_stream.get(), std::move(adapter));
// The new adapter is initialized in a post to the main thread. As soon as
// it is initialized we map its |webrtc_stream| to the
// |remote_stream_adapters_| entry as its secondary key. This ensures that
// there is at least one |AdapterRef| alive until after the adapter is
// initialized and its secondary key is set.
main_thread_->PostTask(
FROM_HERE,
base::Bind(
&WebRtcMediaStreamAdapterMap::OnRemoteStreamAdapterInitialized,
this,
base::Passed(base::WrapUnique(new AdapterRef(
this, AdapterRef::Type::kRemote, adapter_entry)))));
}
return base::WrapUnique(
new AdapterRef(this, AdapterRef::Type::kRemote, adapter_entry));
}
size_t WebRtcMediaStreamAdapterMap::GetRemoteStreamCount() const {
base::AutoLock scoped_lock(lock_);
return remote_stream_adapters_.PrimarySize();
}
void WebRtcMediaStreamAdapterMap::OnRemoteStreamAdapterInitialized(
std::unique_ptr<WebRtcMediaStreamAdapterMap::AdapterRef> adapter_ref) {
DCHECK(main_thread_->BelongsToCurrentThread());
DCHECK(adapter_ref->is_initialized());
{
base::AutoLock scoped_lock(lock_);
remote_stream_adapters_.SetSecondaryKey(
adapter_ref->adapter().webrtc_stream().get(),
adapter_ref->adapter().web_stream().UniqueId());
}
}
} // namespace content
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