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20ee02c49f
SdpVideoFormat is used to configure video encoder and decoders. This CL adds support for comparing two SdpVideoFormat objects to determine if they specify the same video codec. This functionality previously only existed in media/base/codec.h which made the code sensitive to circular dependencies. Once downstream projects stop using cricket::IsSameCodec, this code can be removed. Bug: chromium:1187565 Change-Id: I242069aa6af07917637384c80ee4820887defc7d Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/213427 Commit-Queue: Johannes Kron <kron@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33794}
108 lines
3.7 KiB
C++
108 lines
3.7 KiB
C++
/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "api/video_codecs/sdp_video_format.h"
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#include "absl/strings/match.h"
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#include "api/video_codecs/h264_profile_level_id.h"
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#include "api/video_codecs/video_codec.h"
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#include "api/video_codecs/vp9_profile.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/strings/string_builder.h"
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namespace webrtc {
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namespace {
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std::string H264GetPacketizationModeOrDefault(
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const SdpVideoFormat::Parameters& params) {
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constexpr char kH264FmtpPacketizationMode[] = "packetization-mode";
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const auto it = params.find(kH264FmtpPacketizationMode);
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if (it != params.end()) {
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return it->second;
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}
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// If packetization-mode is not present, default to "0".
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// https://tools.ietf.org/html/rfc6184#section-6.2
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return "0";
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}
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bool H264IsSamePacketizationMode(const SdpVideoFormat::Parameters& left,
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const SdpVideoFormat::Parameters& right) {
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return H264GetPacketizationModeOrDefault(left) ==
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H264GetPacketizationModeOrDefault(right);
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}
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// Some (video) codecs are actually families of codecs and rely on parameters
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// to distinguish different incompatible family members.
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bool IsSameCodecSpecific(const SdpVideoFormat& format1,
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const SdpVideoFormat& format2) {
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// The assumption when calling this function is that the two formats have the
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// same name.
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RTC_DCHECK(absl::EqualsIgnoreCase(format1.name, format2.name));
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VideoCodecType codec_type = PayloadStringToCodecType(format1.name);
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switch (codec_type) {
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case kVideoCodecH264:
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return H264IsSameProfile(format1.parameters, format2.parameters) &&
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H264IsSamePacketizationMode(format1.parameters,
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format2.parameters);
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case kVideoCodecVP9:
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return VP9IsSameProfile(format1.parameters, format2.parameters);
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default:
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return true;
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}
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}
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} // namespace
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SdpVideoFormat::SdpVideoFormat(const std::string& name) : name(name) {}
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SdpVideoFormat::SdpVideoFormat(const std::string& name,
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const Parameters& parameters)
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: name(name), parameters(parameters) {}
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SdpVideoFormat::SdpVideoFormat(const SdpVideoFormat&) = default;
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SdpVideoFormat::SdpVideoFormat(SdpVideoFormat&&) = default;
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SdpVideoFormat& SdpVideoFormat::operator=(const SdpVideoFormat&) = default;
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SdpVideoFormat& SdpVideoFormat::operator=(SdpVideoFormat&&) = default;
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SdpVideoFormat::~SdpVideoFormat() = default;
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std::string SdpVideoFormat::ToString() const {
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rtc::StringBuilder builder;
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builder << "Codec name: " << name << ", parameters: {";
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for (const auto& kv : parameters)
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builder << " " << kv.first << "=" << kv.second;
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builder << " }";
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return builder.str();
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}
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bool SdpVideoFormat::IsSameCodec(const SdpVideoFormat& other) const {
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// Two codecs are considered the same if the name matches (case insensitive)
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// and certain codec-specific parameters match.
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return absl::EqualsIgnoreCase(name, other.name) &&
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IsSameCodecSpecific(*this, other);
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}
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bool SdpVideoFormat::IsCodecInList(
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rtc::ArrayView<const webrtc::SdpVideoFormat> formats) const {
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for (const auto& format : formats) {
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if (IsSameCodec(format)) {
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return true;
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}
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}
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return false;
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}
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bool operator==(const SdpVideoFormat& a, const SdpVideoFormat& b) {
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return a.name == b.name && a.parameters == b.parameters;
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}
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} // namespace webrtc
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