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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: softtabstop=2:shiftwidth=2:expandtab
* */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
// Original author: bcampen@mozilla.com
#include "MediaPipelineFilter.h"
#include "webrtc/modules/interface/module_common_types.h"
namespace mozilla {
MediaPipelineFilter::MediaPipelineFilter() : correlator_(0) {
}
bool MediaPipelineFilter::Filter(const webrtc::RTPHeader& header,
uint32_t correlator) {
if (correlator) {
// This special correlator header takes precedence. It also lets us learn
// about SSRC mappings if we don't know about them yet.
if (correlator == correlator_) {
AddRemoteSSRC(header.ssrc);
return true;
} else {
// Some other stream; it is possible that an SSRC has moved, so make sure
// we don't have that SSRC in our filter any more.
remote_ssrc_set_.erase(header.ssrc);
return false;
}
}
if (remote_ssrc_set_.count(header.ssrc)) {
return true;
}
// Last ditch effort...
if (payload_type_set_.count(header.payloadType)) {
// Actual match. We need to update the ssrc map so we can route rtcp
// sender reports correctly (these use a different payload-type field)
AddRemoteSSRC(header.ssrc);
return true;
}
return false;
}
void MediaPipelineFilter::AddRemoteSSRC(uint32_t ssrc) {
remote_ssrc_set_.insert(ssrc);
}
void MediaPipelineFilter::AddUniquePT(uint8_t payload_type) {
payload_type_set_.insert(payload_type);
}
void MediaPipelineFilter::SetCorrelator(uint32_t correlator) {
correlator_ = correlator;
}
void MediaPipelineFilter::Update(const MediaPipelineFilter& filter_update) {
// We will not stomp the remote_ssrc_set_ if the update has no ssrcs,
// because we don't want to unlearn any remote ssrcs unless the other end
// has explicitly given us a new set.
if (!filter_update.remote_ssrc_set_.empty()) {
remote_ssrc_set_ = filter_update.remote_ssrc_set_;
}
payload_type_set_ = filter_update.payload_type_set_;
correlator_ = filter_update.correlator_;
}
bool
MediaPipelineFilter::FilterSenderReport(const unsigned char* data,
size_t len) const {
if (len < FIRST_SSRC_OFFSET + 4) {
return false;
}
uint8_t payload_type = data[PT_OFFSET];
if (payload_type != SENDER_REPORT_T) {
return false;
}
uint32_t ssrc = 0;
ssrc += (uint32_t)data[FIRST_SSRC_OFFSET] << 24;
ssrc += (uint32_t)data[FIRST_SSRC_OFFSET + 1] << 16;
ssrc += (uint32_t)data[FIRST_SSRC_OFFSET + 2] << 8;
ssrc += (uint32_t)data[FIRST_SSRC_OFFSET + 3];
return !!remote_ssrc_set_.count(ssrc);
}
} // end namespace mozilla
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