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/*
* Copyright (c) 2012 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 "modules/rtp_rtcp/include/rtp_header_extension_map.h"
#include <cstdint>
#include "absl/strings/string_view.h"
#include "api/array_view.h"
#include "api/rtp_parameters.h"
#include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
#include "modules/rtp_rtcp/source/corruption_detection_extension.h"
#include "modules/rtp_rtcp/source/rtp_dependency_descriptor_extension.h"
#include "modules/rtp_rtcp/source/rtp_generic_frame_descriptor_extension.h"
#include "modules/rtp_rtcp/source/rtp_header_extensions.h"
#include "modules/rtp_rtcp/source/rtp_video_layers_allocation_extension.h"
#include "rtc_base/arraysize.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
namespace webrtc {
namespace {
struct ExtensionInfo {
RTPExtensionType type;
absl::string_view uri;
};
template <typename Extension>
constexpr ExtensionInfo CreateExtensionInfo() {
return {Extension::kId, Extension::Uri()};
}
constexpr ExtensionInfo kExtensions[] = {
CreateExtensionInfo<TransmissionOffset>(),
CreateExtensionInfo<AudioLevelExtension>(),
CreateExtensionInfo<CsrcAudioLevel>(),
CreateExtensionInfo<AbsoluteSendTime>(),
CreateExtensionInfo<AbsoluteCaptureTimeExtension>(),
CreateExtensionInfo<VideoOrientation>(),
CreateExtensionInfo<TransportSequenceNumber>(),
CreateExtensionInfo<TransportSequenceNumberV2>(),
CreateExtensionInfo<PlayoutDelayLimits>(),
CreateExtensionInfo<VideoContentTypeExtension>(),
CreateExtensionInfo<RtpVideoLayersAllocationExtension>(),
CreateExtensionInfo<VideoTimingExtension>(),
CreateExtensionInfo<RtpStreamId>(),
CreateExtensionInfo<RepairedRtpStreamId>(),
CreateExtensionInfo<RtpMid>(),
CreateExtensionInfo<RtpGenericFrameDescriptorExtension00>(),
CreateExtensionInfo<RtpDependencyDescriptorExtension>(),
CreateExtensionInfo<ColorSpaceExtension>(),
CreateExtensionInfo<InbandComfortNoiseExtension>(),
CreateExtensionInfo<VideoFrameTrackingIdExtension>(),
CreateExtensionInfo<CorruptionDetectionExtension>(),
};
// Because of kRtpExtensionNone, NumberOfExtension is 1 bigger than the actual
// number of known extensions.
static_assert(arraysize(kExtensions) ==
static_cast<int>(kRtpExtensionNumberOfExtensions) - 1,
"kExtensions expect to list all known extensions");
} // namespace
RtpHeaderExtensionMap::RtpHeaderExtensionMap() : RtpHeaderExtensionMap(false) {}
RtpHeaderExtensionMap::RtpHeaderExtensionMap(bool extmap_allow_mixed)
: extmap_allow_mixed_(extmap_allow_mixed) {
for (auto& id : ids_)
id = kInvalidId;
}
RtpHeaderExtensionMap::RtpHeaderExtensionMap(
ArrayView<const RtpExtension> extensions)
: RtpHeaderExtensionMap(false) {
for (const RtpExtension& extension : extensions)
RegisterByUri(extension.id, extension.uri);
}
void RtpHeaderExtensionMap::Reset(ArrayView<const RtpExtension> extensions) {
for (auto& id : ids_)
id = kInvalidId;
for (const RtpExtension& extension : extensions)
RegisterByUri(extension.id, extension.uri);
}
bool RtpHeaderExtensionMap::RegisterByType(int id, RTPExtensionType type) {
for (const ExtensionInfo& extension : kExtensions)
if (type == extension.type)
return Register(id, extension.type, extension.uri);
RTC_DCHECK_NOTREACHED();
return false;
}
bool RtpHeaderExtensionMap::RegisterByUri(int id, absl::string_view uri) {
for (const ExtensionInfo& extension : kExtensions)
if (uri == extension.uri)
return Register(id, extension.type, extension.uri);
RTC_LOG(LS_WARNING) << "Unknown extension uri:'" << uri << "', id: " << id
<< '.';
return false;
}
RTPExtensionType RtpHeaderExtensionMap::GetType(int id) const {
RTC_DCHECK_GE(id, RtpExtension::kMinId);
RTC_DCHECK_LE(id, RtpExtension::kMaxId);
for (int type = kRtpExtensionNone + 1; type < kRtpExtensionNumberOfExtensions;
++type) {
if (ids_[type] == id) {
return static_cast<RTPExtensionType>(type);
}
}
return kInvalidType;
}
void RtpHeaderExtensionMap::Deregister(absl::string_view uri) {
for (const ExtensionInfo& extension : kExtensions) {
if (extension.uri == uri) {
ids_[extension.type] = kInvalidId;
break;
}
}
}
bool RtpHeaderExtensionMap::Register(int id,
RTPExtensionType type,
absl::string_view uri) {
RTC_DCHECK_GT(type, kRtpExtensionNone);
RTC_DCHECK_LT(type, kRtpExtensionNumberOfExtensions);
if (id < RtpExtension::kMinId || id > RtpExtension::kMaxId) {
RTC_LOG(LS_WARNING) << "Failed to register extension uri:'" << uri
<< "' with invalid id:" << id << ".";
return false;
}
RTPExtensionType registered_type = GetType(id);
if (registered_type == type) { // Same type/id pair already registered.
RTC_LOG(LS_VERBOSE) << "Reregistering extension uri:'" << uri
<< "', id:" << id;
return true;
}
if (registered_type !=
kInvalidType) { // `id` used by another extension type.
RTC_LOG(LS_WARNING) << "Failed to register extension uri:'" << uri
<< "', id:" << id
<< ". Id already in use by extension type "
<< static_cast<int>(registered_type);
return false;
}
if (IsRegistered(type)) {
RTC_LOG(LS_WARNING) << "Illegal reregistration for uri: " << uri
<< " is previously registered with id " << GetId(type)
<< " and cannot be reregistered with id " << id;
return false;
}
// There is a run-time check above id fits into uint8_t.
ids_[type] = static_cast<uint8_t>(id);
return true;
}
} // namespace webrtc
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