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/*
* libjingle
* Copyright 2014 Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "talk/media/webrtc/webrtcmediaengine.h"
#include <algorithm>
#include "talk/media/webrtc/webrtcvideoengine2.h"
#include "talk/media/webrtc/webrtcvoiceengine.h"
namespace cricket {
class WebRtcMediaEngine2
: public CompositeMediaEngine<WebRtcVoiceEngine, WebRtcVideoEngine2> {
public:
WebRtcMediaEngine2(webrtc::AudioDeviceModule* adm,
WebRtcVideoEncoderFactory* encoder_factory,
WebRtcVideoDecoderFactory* decoder_factory) {
voice_.SetAudioDeviceModule(adm);
video_.SetExternalDecoderFactory(decoder_factory);
video_.SetExternalEncoderFactory(encoder_factory);
}
};
} // namespace cricket
cricket::MediaEngineInterface* CreateWebRtcMediaEngine(
webrtc::AudioDeviceModule* adm,
cricket::WebRtcVideoEncoderFactory* encoder_factory,
cricket::WebRtcVideoDecoderFactory* decoder_factory) {
return new cricket::WebRtcMediaEngine2(adm, encoder_factory,
decoder_factory);
}
void DestroyWebRtcMediaEngine(cricket::MediaEngineInterface* media_engine) {
delete media_engine;
}
namespace cricket {
// Used by PeerConnectionFactory to create a media engine passed into
// ChannelManager.
MediaEngineInterface* WebRtcMediaEngineFactory::Create(
webrtc::AudioDeviceModule* adm,
WebRtcVideoEncoderFactory* encoder_factory,
WebRtcVideoDecoderFactory* decoder_factory) {
return CreateWebRtcMediaEngine(adm, encoder_factory, decoder_factory);
}
namespace {
// Remove mutually exclusive extensions with lower priority.
void DiscardRedundantExtensions(
std::vector<webrtc::RtpExtension>* extensions,
rtc::ArrayView<const char*> extensions_decreasing_prio) {
RTC_DCHECK(extensions);
bool found = false;
for (const char* name : extensions_decreasing_prio) {
auto it = std::find_if(extensions->begin(), extensions->end(),
[name](const webrtc::RtpExtension& rhs) {
return rhs.name == name;
});
if (it != extensions->end()) {
if (found) {
extensions->erase(it);
}
found = true;
}
}
}
} // namespace
bool ValidateRtpExtensions(const std::vector<RtpHeaderExtension>& extensions) {
bool id_used[14] = {false};
for (const auto& extension : extensions) {
if (extension.id <= 0 || extension.id >= 15) {
LOG(LS_ERROR) << "Bad RTP extension ID: " << extension.ToString();
return false;
}
if (id_used[extension.id - 1]) {
LOG(LS_ERROR) << "Duplicate RTP extension ID: " << extension.ToString();
return false;
}
id_used[extension.id - 1] = true;
}
return true;
}
std::vector<webrtc::RtpExtension> FilterRtpExtensions(
const std::vector<RtpHeaderExtension>& extensions,
bool (*supported)(const std::string&),
bool filter_redundant_extensions) {
RTC_DCHECK(ValidateRtpExtensions(extensions));
RTC_DCHECK(supported);
std::vector<webrtc::RtpExtension> result;
// Ignore any extensions that we don't recognize.
for (const auto& extension : extensions) {
if (supported(extension.uri)) {
result.push_back({extension.uri, extension.id});
} else {
LOG(LS_WARNING) << "Unsupported RTP extension: " << extension.ToString();
}
}
// Sort by name, ascending, so that we don't reset extensions if they were
// specified in a different order (also allows us to use std::unique below).
std::sort(result.begin(), result.end(),
[](const webrtc::RtpExtension& rhs, const webrtc::RtpExtension& lhs) {
return rhs.name < lhs.name;
});
// Remove unnecessary extensions (used on send side).
if (filter_redundant_extensions) {
auto it = std::unique(result.begin(), result.end(),
[](const webrtc::RtpExtension& rhs, const webrtc::RtpExtension& lhs) {
return rhs.name == lhs.name;
});
result.erase(it, result.end());
// Keep just the highest priority extension of any in the following list.
static const char* kBweExtensionPriorities[] = {
kRtpTransportSequenceNumberHeaderExtension,
kRtpAbsoluteSenderTimeHeaderExtension,
kRtpTimestampOffsetHeaderExtension
};
DiscardRedundantExtensions(&result, kBweExtensionPriorities);
}
return result;
}
} // namespace cricket
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