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RTC: sdp surpport ssrc group encode and decode

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This commit is contained in:
jinxue.cgh 2020-06-27 17:06:33 +08:00 • committed by winlin
parent 5b54ceadb1
commit 6662568c11
2 changed files with 61 additions and 2 deletions
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52
trunk/src/app/srs_app_rtc_sdp.cpp
View file

@ -206,6 +206,40 @@ srs_error_t SrsSSRCInfo::encode(std::ostringstream& os)
return err;
}
SrsSSRCGroup::SrsSSRCGroup()
{
}
SrsSSRCGroup::~SrsSSRCGroup()
{
}
SrsSSRCGroup::SrsSSRCGroup(const std::string& semantic, const std::vector<uint32_t>& ssrcs)
{
semantic_ = semantic;
ssrcs_ = ssrcs;
}
srs_error_t SrsSSRCGroup::encode(std::ostringstream& os)
{
srs_error_t err = srs_success;
if (semantic_.empty()) {
return srs_error_new(ERROR_RTC_SDP_DECODE, "invalid semantics");
}
if (ssrcs_.size() == 0) {
return srs_error_new(ERROR_RTC_SDP_DECODE, "invalid ssrcs");
}
os << "a=ssrc-group:" << semantic_;
for (int i = 0; i < (int)ssrcs_.size(); i++) {
os << " " << ssrcs_[i];
}
return err;
}
SrsMediaPayloadType::SrsMediaPayloadType(int payload_type)
{
payload_type_ = payload_type;
@ -589,6 +623,7 @@ srs_error_t SrsMediaDesc::parse_attr_ssrc(const std::string& value)
ssrc_info.cname_ = ssrc_value;
ssrc_info.ssrc_ = ssrc;
} else if (ssrc_attr == "msid") {
// @see: https://tools.ietf.org/html/draft-alvestrand-mmusic-msid-00#section-2
std::vector<std::string> vec = split_str(ssrc_value, " ");
if (vec.empty()) {
return srs_error_new(ERROR_RTC_SDP_DECODE, "invalid ssrc line=%s", value.c_str());
@ -618,10 +653,23 @@ srs_error_t SrsMediaDesc::parse_attr_ssrc_group(const std::string& value)
std::string semantics;
FETCH(is, semantics);
// TODO: ssrc group process
if (semantics == "FID") {
std::string ssrc_ids = is.str().substr(is.tellg());
skip_first_spaces(ssrc_ids);
std::vector<std::string> vec = split_str(ssrc_ids, " ");
if (vec.size() == 0) {
return srs_error_new(ERROR_RTC_SDP_DECODE, "invalid ssrc-group line=%s", value.c_str());
}
std::vector<uint32_t> ssrcs;
for (size_t i = 0; i < vec.size(); ++i) {
std::istringstream in_stream(vec[i]);
uint32_t ssrc = 0;
in_stream >> ssrc;
ssrcs.push_back(ssrc);
}
ssrc_groups_.push_back(SrsSSRCGroup(semantics, ssrcs));
return err;
}

11
trunk/src/app/srs_app_rtc_sdp.hpp
View file

@ -78,6 +78,17 @@ public:
class SrsSSRCGroup
{
public:
SrsSSRCGroup();
SrsSSRCGroup(const std::string& usage, const std::vector<uint32_t>& ssrcs);
virtual ~SrsSSRCGroup();
public:
srs_error_t encode(std::ostringstream& os);
public:
// e.g FIX, FEC, SIM.
std::string semantic_;
// SSRCs of this type.
std::vector<uint32_t> ssrcs_;
};
struct H264SpecificParam