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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/protocol/sdp_message.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
namespace remoting {
namespace protocol {
SdpMessage::SdpMessage(const std::string& sdp) {
sdp_lines_ =
SplitString(sdp, "\n", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
for (const auto& line : sdp_lines_) {
if (base::StartsWith(line, "m=audio", base::CompareCase::SENSITIVE))
has_audio_ = true;
if (base::StartsWith(line, "m=video", base::CompareCase::SENSITIVE))
has_video_ = true;
}
}
SdpMessage::~SdpMessage() {}
std::string SdpMessage::ToString() const {
return base::JoinString(sdp_lines_, "\n") + "\n";
}
bool SdpMessage::AddCodecParameter(const std::string& codec,
const std::string& parameters_to_add) {
int line_num;
std::string payload_type;
bool codec_found = FindCodec(codec, &line_num, &payload_type);
if (!codec_found) {
return false;
}
sdp_lines_.insert(sdp_lines_.begin() + line_num + 1,
"a=fmtp:" + payload_type + ' ' + parameters_to_add);
return true;
}
bool SdpMessage::FindCodec(const std::string& codec,
int* line_num,
std::string* payload_type) const {
const std::string kRtpMapPrefix = "a=rtpmap:";
for (size_t i = 0; i < sdp_lines_.size(); ++i) {
const auto& line = sdp_lines_[i];
if (!base::StartsWith(line, kRtpMapPrefix, base::CompareCase::SENSITIVE))
continue;
size_t space_pos = line.find(' ');
if (space_pos == std::string::npos)
continue;
if (line.substr(space_pos + 1, codec.size()) == codec &&
line[space_pos + 1 + codec.size()] == '/') {
*line_num = i;
*payload_type =
line.substr(kRtpMapPrefix.size(), space_pos - kRtpMapPrefix.size());
return true;
}
}
return false;
}
} // namespace protocol
} // namespace remoting
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