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/*
* Copyright (c) 2018 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 "api/video_codecs/sdp_video_format.h"
#include "absl/strings/match.h"
#include "absl/types/optional.h"
#include "api/array_view.h"
#include "api/video_codecs/av1_profile.h"
#include "api/video_codecs/h264_profile_level_id.h"
#include "api/video_codecs/video_codec.h"
#include "api/video_codecs/vp9_profile.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/strings/string_builder.h"
namespace webrtc {
namespace {
std::string H264GetPacketizationModeOrDefault(
const SdpVideoFormat::Parameters& params) {
constexpr char kH264FmtpPacketizationMode[] = "packetization-mode";
const auto it = params.find(kH264FmtpPacketizationMode);
if (it != params.end()) {
return it->second;
}
// If packetization-mode is not present, default to "0".
// https://tools.ietf.org/html/rfc6184#section-6.2
return "0";
}
bool H264IsSamePacketizationMode(const SdpVideoFormat::Parameters& left,
const SdpVideoFormat::Parameters& right) {
return H264GetPacketizationModeOrDefault(left) ==
H264GetPacketizationModeOrDefault(right);
}
// Some (video) codecs are actually families of codecs and rely on parameters
// to distinguish different incompatible family members.
bool IsSameCodecSpecific(const SdpVideoFormat& format1,
const SdpVideoFormat& format2) {
// The assumption when calling this function is that the two formats have the
// same name.
RTC_DCHECK(absl::EqualsIgnoreCase(format1.name, format2.name));
VideoCodecType codec_type = PayloadStringToCodecType(format1.name);
switch (codec_type) {
case kVideoCodecH264:
return H264IsSameProfile(format1.parameters, format2.parameters) &&
H264IsSamePacketizationMode(format1.parameters,
format2.parameters);
case kVideoCodecVP9:
return VP9IsSameProfile(format1.parameters, format2.parameters);
case kVideoCodecAV1:
return AV1IsSameProfile(format1.parameters, format2.parameters);
default:
return true;
}
}
} // namespace
SdpVideoFormat::SdpVideoFormat(const std::string& name) : name(name) {}
SdpVideoFormat::SdpVideoFormat(const std::string& name,
const Parameters& parameters)
: name(name), parameters(parameters) {}
SdpVideoFormat::SdpVideoFormat(
const std::string& name,
const Parameters& parameters,
const absl::InlinedVector<ScalabilityMode, kScalabilityModeCount>&
scalability_modes)
: name(name),
parameters(parameters),
scalability_modes(scalability_modes) {}
SdpVideoFormat::SdpVideoFormat(const SdpVideoFormat&) = default;
SdpVideoFormat::SdpVideoFormat(SdpVideoFormat&&) = default;
SdpVideoFormat& SdpVideoFormat::operator=(const SdpVideoFormat&) = default;
SdpVideoFormat& SdpVideoFormat::operator=(SdpVideoFormat&&) = default;
SdpVideoFormat::~SdpVideoFormat() = default;
std::string SdpVideoFormat::ToString() const {
rtc::StringBuilder builder;
builder << "Codec name: " << name << ", parameters: {";
for (const auto& kv : parameters) {
builder << " " << kv.first << "=" << kv.second;
}
builder << " }";
if (!scalability_modes.empty()) {
builder << ", scalability_modes: [";
bool first = true;
for (const auto scalability_mode : scalability_modes) {
if (first) {
first = false;
} else {
builder << ", ";
}
builder << ScalabilityModeToString(scalability_mode);
}
builder << "]";
}
return builder.str();
}
bool SdpVideoFormat::IsSameCodec(const SdpVideoFormat& other) const {
// Two codecs are considered the same if the name matches (case insensitive)
// and certain codec-specific parameters match.
return absl::EqualsIgnoreCase(name, other.name) &&
IsSameCodecSpecific(*this, other);
}
bool SdpVideoFormat::IsCodecInList(
rtc::ArrayView<const webrtc::SdpVideoFormat> formats) const {
for (const auto& format : formats) {
if (IsSameCodec(format)) {
return true;
}
}
return false;
}
bool operator==(const SdpVideoFormat& a, const SdpVideoFormat& b) {
return a.name == b.name && a.parameters == b.parameters &&
a.scalability_modes == b.scalability_modes;
}
absl::optional<SdpVideoFormat> FuzzyMatchSdpVideoFormat(
rtc::ArrayView<const SdpVideoFormat> supported_formats,
const SdpVideoFormat& format) {
absl::optional<SdpVideoFormat> res;
int best_parameter_match = 0;
for (const auto& supported_format : supported_formats) {
if (absl::EqualsIgnoreCase(supported_format.name, format.name)) {
int matching_parameters = 0;
for (const auto& kv : supported_format.parameters) {
auto it = format.parameters.find(kv.first);
if (it != format.parameters.end() && it->second == kv.second) {
matching_parameters += 1;
}
}
if (!res || matching_parameters > best_parameter_match) {
res = supported_format;
best_parameter_match = matching_parameters;
}
}
}
if (!res) {
RTC_LOG(LS_INFO) << "Failed to match SdpVideoFormat " << format.ToString();
} else if (*res != format) {
RTC_LOG(LS_INFO) << "Matched SdpVideoFormat " << format.ToString()
<< " with " << res->ToString();
}
return res;
}
} // namespace webrtc
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