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make setCodecPreferences retain position of rtx/red

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close to the codec they relate to as it is done by video_engine.
This does not change functionality but improves readability of the SDP

BUG=webrtc:13287

Change-Id: I9b03cd3131eaa932ffed3fb4e66cbf55faedcdd6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/235665
Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com>
Cr-Commit-Position: refs/heads/main@{#35311}
This commit is contained in:
Philipp Hancke
2021-10-19 18:27:28 +02:00
committed by WebRTC LUCI CQ
parent 97597c0f51
commit c13e786c8f
1 changed files with 31 additions and 28 deletions
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59
pc/media_session.cc
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@ -741,10 +741,16 @@ static Codecs MatchCodecPreference(
const Codecs& codecs,
const Codecs& supported_codecs) {
Codecs filtered_codecs;
std::set<std::string> kept_codecs_ids;
bool want_rtx = false;
bool want_red = false;
for (const auto& codec_preference : codec_preferences) {
if (IsRtxCodec(codec_preference)) {
want_rtx = true;
} else if (IsRedCodec(codec_preference)) {
want_red = true;
}
}
for (const auto& codec_preference : codec_preferences) {
auto found_codec = absl::c_find_if(
supported_codecs,
@ -764,33 +770,30 @@ static Codecs MatchCodecPreference(
if (FindMatchingCodec(supported_codecs, codecs, *found_codec,
&found_codec_with_correct_pt)) {
filtered_codecs.push_back(found_codec_with_correct_pt);
kept_codecs_ids.insert(std::to_string(found_codec_with_correct_pt.id));
}
} else if (IsRtxCodec(codec_preference)) {
want_rtx = true;
} else if (IsRedCodec(codec_preference)) {
want_red = true;
}
}
if (want_rtx || want_red) {
for (const auto& codec : codecs) {
if (IsRtxCodec(codec)) {
const auto apt =
codec.params.find(cricket::kCodecParamAssociatedPayloadType);
if (apt != codec.params.end() &&
kept_codecs_ids.count(apt->second) > 0) {
filtered_codecs.push_back(codec);
}
} else if (IsRedCodec(codec)) {
const auto fmtp =
codec.params.find(cricket::kCodecParamNotInNameValueFormat);
if (fmtp != codec.params.end()) {
std::vector<std::string> redundant_payloads;
rtc::split(fmtp->second, '/', &redundant_payloads);
if (redundant_payloads.size() > 0 &&
kept_codecs_ids.count(redundant_payloads[0]) > 0) {
filtered_codecs.push_back(codec);
std::string id = rtc::ToString(found_codec_with_correct_pt.id);
// Search for the matching rtx or red codec.
if (want_red || want_rtx) {
for (const auto& codec : codecs) {
if (IsRtxCodec(codec)) {
const auto apt =
codec.params.find(cricket::kCodecParamAssociatedPayloadType);
if (apt != codec.params.end() && apt->second == id) {
filtered_codecs.push_back(codec);
break;
}
} else if (IsRedCodec(codec)) {
const auto fmtp =
codec.params.find(cricket::kCodecParamNotInNameValueFormat);
if (fmtp != codec.params.end()) {
std::vector<std::string> redundant_payloads;
rtc::split(fmtp->second, '/', &redundant_payloads);
if (redundant_payloads.size() > 0 &&
redundant_payloads[0] == id) {
filtered_codecs.push_back(codec);
break;
}
}
}
}
}
}