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// Copyright 2014 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 "media/cast/net/rtcp/receiver_rtcp_event_subscriber.h"
#include <algorithm>
#include <utility>
namespace media {
namespace cast {
ReceiverRtcpEventSubscriber::ReceiverRtcpEventSubscriber(
const size_t max_size_to_retain, EventMediaType type)
: max_size_to_retain_(
max_size_to_retain * (kResendDelay * kNumResends + 1)),
type_(type),
popped_events_(0) {
DCHECK(max_size_to_retain_ > 0u);
DCHECK(type_ == AUDIO_EVENT || type_ == VIDEO_EVENT);
for (size_t i = 0; i < kNumResends; i++) {
send_ptrs_[i] = 0;
}
}
ReceiverRtcpEventSubscriber::~ReceiverRtcpEventSubscriber() {
DCHECK(thread_checker_.CalledOnValidThread());
}
void ReceiverRtcpEventSubscriber::OnReceiveFrameEvent(
const FrameEvent& frame_event) {
DCHECK(thread_checker_.CalledOnValidThread());
if (ShouldProcessEvent(frame_event.type, frame_event.media_type)) {
RtcpEvent rtcp_event;
switch (frame_event.type) {
case FRAME_PLAYOUT:
rtcp_event.delay_delta = frame_event.delay_delta;
case FRAME_ACK_SENT:
case FRAME_DECODED:
rtcp_event.type = frame_event.type;
rtcp_event.timestamp = frame_event.timestamp;
rtcp_events_.push_back(
std::make_pair(frame_event.rtp_timestamp, rtcp_event));
break;
default:
break;
}
}
TruncateMapIfNeeded();
}
void ReceiverRtcpEventSubscriber::OnReceivePacketEvent(
const PacketEvent& packet_event) {
DCHECK(thread_checker_.CalledOnValidThread());
if (ShouldProcessEvent(packet_event.type, packet_event.media_type)) {
RtcpEvent rtcp_event;
if (packet_event.type == PACKET_RECEIVED) {
rtcp_event.type = packet_event.type;
rtcp_event.timestamp = packet_event.timestamp;
rtcp_event.packet_id = packet_event.packet_id;
rtcp_events_.push_back(
std::make_pair(packet_event.rtp_timestamp, rtcp_event));
}
}
TruncateMapIfNeeded();
}
struct CompareByFirst {
bool operator()(const std::pair<RtpTimeTicks, RtcpEvent>& a,
const std::pair<RtpTimeTicks, RtcpEvent>& b) {
return a.first < b.first;
}
};
void ReceiverRtcpEventSubscriber::GetRtcpEventsWithRedundancy(
RtcpEvents* rtcp_events) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(rtcp_events);
uint64_t event_level = rtcp_events_.size() + popped_events_;
event_levels_for_past_frames_.push_back(event_level);
for (size_t i = 0; i < kNumResends; i++) {
size_t resend_delay = kResendDelay * i;
if (event_levels_for_past_frames_.size() < resend_delay + 1)
break;
uint64_t send_limit =
event_levels_for_past_frames_[event_levels_for_past_frames_.size() - 1 -
resend_delay];
if (send_ptrs_[i] < popped_events_) {
send_ptrs_[i] = popped_events_;
}
while (send_ptrs_[i] < send_limit &&
rtcp_events->size() < kMaxEventsPerRTCP) {
rtcp_events->push_back(rtcp_events_[send_ptrs_[i] - popped_events_]);
send_ptrs_[i]++;
}
send_limit = send_ptrs_[i];
}
if (event_levels_for_past_frames_.size() > kResendDelay * (kNumResends + 1)) {
while (popped_events_ < event_levels_for_past_frames_[0]) {
rtcp_events_.pop_front();
popped_events_++;
}
event_levels_for_past_frames_.pop_front();
}
std::sort(rtcp_events->begin(), rtcp_events->end(), CompareByFirst());
}
void ReceiverRtcpEventSubscriber::TruncateMapIfNeeded() {
// If map size has exceeded |max_size_to_retain_|, remove entry with
// the smallest RTP timestamp.
if (rtcp_events_.size() > max_size_to_retain_) {
DVLOG(3) << "RTCP event map exceeded size limit; "
<< "removing oldest entry";
// This is fine since we only insert elements one at a time.
rtcp_events_.pop_front();
popped_events_++;
}
DCHECK(rtcp_events_.size() <= max_size_to_retain_);
}
bool ReceiverRtcpEventSubscriber::ShouldProcessEvent(
CastLoggingEvent event_type, EventMediaType event_media_type) {
return type_ == event_media_type &&
(event_type == FRAME_ACK_SENT || event_type == FRAME_DECODED ||
event_type == FRAME_PLAYOUT || event_type == PACKET_RECEIVED);
}
} // namespace cast
} // namespace media
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