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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "video_engine/vie_remb.h"
#include <cassert>
#include "modules/rtp_rtcp/interface/rtp_rtcp.h"
#include "system_wrappers/interface/critical_section_wrapper.h"
#include "system_wrappers/interface/tick_util.h"
#include "system_wrappers/interface/trace.h"
namespace webrtc {
const int kRembSendIntervallMs = 1000;
// % threshold for if we should send a new REMB asap.
const int kSendThresholdPercent = 97;
VieRemb::VieRemb(int engine_id)
: engine_id_(engine_id),
list_crit_(CriticalSectionWrapper::CreateCriticalSection()),
last_remb_time_(TickTime::MillisecondTimestamp()),
last_send_bitrate_(0) {
}
VieRemb::~VieRemb() {
}
void VieRemb::AddReceiveChannel(RtpRtcp* rtp_rtcp) {
WEBRTC_TRACE(kTraceStateInfo, kTraceVideo, engine_id_,
"VieRemb::AddReceiveChannel");
assert(rtp_rtcp);
CriticalSectionScoped cs(list_crit_.get());
for (RtpModules::iterator it = receive_modules_.begin();
it != receive_modules_.end(); ++it) {
if ((*it) == rtp_rtcp)
return;
}
WEBRTC_TRACE(kTraceInfo, kTraceVideo, engine_id_, "AddRembChannel");
// The module probably doesn't have a remote SSRC yet, so don't add it to the
// map.
receive_modules_.push_back(rtp_rtcp);
}
void VieRemb::RemoveReceiveChannel(RtpRtcp* rtp_rtcp) {
WEBRTC_TRACE(kTraceStateInfo, kTraceVideo, engine_id_,
"VieRemb::RemoveReceiveChannel");
assert(rtp_rtcp);
CriticalSectionScoped cs(list_crit_.get());
unsigned int ssrc = rtp_rtcp->RemoteSSRC();
for (RtpModules::iterator it = receive_modules_.begin();
it != receive_modules_.end(); ++it) {
if ((*it) == rtp_rtcp) {
receive_modules_.erase(it);
break;
}
}
bitrates_.erase(ssrc);
}
void VieRemb::AddSendChannel(RtpRtcp* rtp_rtcp) {
WEBRTC_TRACE(kTraceStateInfo, kTraceVideo, engine_id_,
"VieRemb::AddSendChannel");
assert(rtp_rtcp);
CriticalSectionScoped cs(list_crit_.get());
// TODO(mflodman) Allow multiple senders.
assert(send_modules_.empty());
send_modules_.push_back(rtp_rtcp);
}
void VieRemb::RemoveSendChannel(RtpRtcp* rtp_rtcp) {
WEBRTC_TRACE(kTraceStateInfo, kTraceVideo, engine_id_,
"VieRemb::AddSendChannel");
assert(rtp_rtcp);
CriticalSectionScoped cs(list_crit_.get());
for (RtpModules::iterator it = send_modules_.begin();
it != send_modules_.end(); ++it) {
if ((*it) == rtp_rtcp) {
send_modules_.erase(it);
return;
}
}
}
void VieRemb::OnReceiveBitrateChanged(unsigned int ssrc, unsigned int bitrate) {
WEBRTC_TRACE(kTraceStateInfo, kTraceVideo, engine_id_,
"VieRemb::UpdateBitrateEstimate(ssrc: %u, bitrate: %u)",
ssrc, bitrate);
CriticalSectionScoped cs(list_crit_.get());
// Check if this is a new ssrc and add it to the map if it is.
if (bitrates_.find(ssrc) == bitrates_.end()) {
bitrates_[ssrc] = bitrate;
}
int new_remb_bitrate = last_send_bitrate_ - bitrates_[ssrc] + bitrate;
if (new_remb_bitrate < kSendThresholdPercent * last_send_bitrate_ / 100) {
// The new bitrate estimate is less than kSendThresholdPercent % of the last
// report. Send a REMB asap.
last_remb_time_ = TickTime::MillisecondTimestamp() - kRembSendIntervallMs;
}
bitrates_[ssrc] = bitrate;
}
WebRtc_Word32 VieRemb::Version(WebRtc_Word8* version,
WebRtc_UWord32& remaining_buffer_in_bytes,
WebRtc_UWord32& position) const {
return 0;
}
WebRtc_Word32 VieRemb::ChangeUniqueId(const WebRtc_Word32 id) {
return 0;
}
WebRtc_Word32 VieRemb::TimeUntilNextProcess() {
return kRembSendIntervallMs -
(TickTime::MillisecondTimestamp() - last_remb_time_);
}
WebRtc_Word32 VieRemb::Process() {
int64_t now = TickTime::MillisecondTimestamp();
if (now - last_remb_time_ < kRembSendIntervallMs)
return 0;
last_remb_time_ = now;
// Calculate total receive bitrate estimate.
list_crit_->Enter();
int total_bitrate = 0;
int num_bitrates = bitrates_.size();
if (num_bitrates == 0) {
list_crit_->Leave();
return 0;
}
// TODO(mflodman) Use std::vector and change RTP module API.
unsigned int* ssrcs = new unsigned int[num_bitrates];
int idx = 0;
for (SsrcBitrate::iterator it = bitrates_.begin(); it != bitrates_.end();
++it, ++idx) {
total_bitrate += it->second;
ssrcs[idx] = it->first;
}
// Send a REMB packet.
RtpRtcp* sender = NULL;
if (!send_modules_.empty()) {
sender = send_modules_.front();
}
last_send_bitrate_ = total_bitrate;
list_crit_->Leave();
if (sender) {
sender->SetREMBData(total_bitrate, num_bitrates, ssrcs);
}
delete [] ssrcs;
return 0;
}
} // namespace webrtc