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https://github.com/ZLMediaKit/ZLMediaKit.git
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优化rtp ext相关代码
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xia-chu
parent
c5fff23040
commit
f263dd5d9d
@ -9,6 +9,7 @@
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*/
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#include "RtpExt.h"
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#include "Sdp.h"
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#if defined(_WIN32)
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#pragma pack(push, 1)
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@ -108,8 +109,35 @@ uint8_t *RtpExtTwoByte::getData() {
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static constexpr uint16_t kOneByteHeader = 0xBEDE;
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static constexpr uint16_t kTwoByteHeader = 0x1000;
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map<uint8_t/*id*/, RtpExt/*data*/> RtpExt::getExtValue(const RtpHeader *header, const RtcMedia &media) {
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map<uint8_t, RtpExt> ret;
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static RtpExtType getExtTypeById(uint8_t id, const RtcMedia &media){
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auto it = media.extmap.find(id);
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if (it == media.extmap.end()) {
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return RtpExtType::padding;
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}
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return RtpExt::getExtType(it->second.ext);
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}
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template<typename Type>
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static void appendExt( map<RtpExtType, RtpExt> &ret,const RtcMedia &media, uint8_t *ptr, const uint8_t *end){
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while (ptr < end) {
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auto ext = reinterpret_cast<Type *>(ptr);
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if (ext->getId() == (uint8_t) RtpExtType::padding) {
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//padding，忽略
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++ptr;
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continue;
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}
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//15类型的rtp ext为保留
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CHECK(ext->getId() < (uint8_t) RtpExtType::reserved);
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CHECK(reinterpret_cast<uint8_t *>(ext) + Type::kMinSize <= end);
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CHECK(ext->getData() + ext->getSize() <= end);
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auto type = getExtTypeById(ext->getId(), media);
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ret.emplace(type, RtpExt(type, ext->getId(), reinterpret_cast<char *>(ext->getData()), ext->getSize()));
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ptr += Type::kMinSize + ext->getSize();
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}
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}
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map<RtpExtType/*type*/, RtpExt/*data*/> RtpExt::getExtValue(const RtpHeader *header, const RtcMedia &media) {
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map<RtpExtType, RtpExt> ret;
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assert(header);
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auto ext_size = header->getExtSize();
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if (!ext_size) {
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@ -118,66 +146,37 @@ map<uint8_t/*id*/, RtpExt/*data*/> RtpExt::getExtValue(const RtpHeader *header,
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auto reserved = header->getExtReserved();
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auto ptr = const_cast<RtpHeader *>(header)->getExtData();
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auto end = ptr + ext_size;
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RtpExtType type;
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if (reserved == kOneByteHeader) {
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while (ptr < end) {
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RtpExtOneByte *ext = reinterpret_cast<RtpExtOneByte *>(ptr);
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if (ext->getId() == (uint8_t) RtpExtType::padding) {
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//padding，忽略
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++ptr;
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continue;
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}
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//15类型的rtp ext为保留
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CHECK(ext->getId() < (uint8_t) RtpExtType::reserved);
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CHECK(reinterpret_cast<uint8_t *>(ext) + RtpExtOneByte::kMinSize <= end);
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CHECK(ext->getData() + ext->getSize() <= end);
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ret.emplace(ext->getId(), RtpExt(type, reinterpret_cast<char *>(ext->getData()), ext->getSize()));
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ptr += RtpExtOneByte::kMinSize + ext->getSize();
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}
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appendExt<RtpExtOneByte>(ret, media, ptr, end);
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return ret;
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}
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if ((reserved & 0xFFF0) >> 4 == kTwoByteHeader) {
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while (ptr < end) {
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RtpExtTwoByte *ext = reinterpret_cast<RtpExtTwoByte *>(ptr);
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if (ext->getId() == (uint8_t) RtpExtType::padding) {
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//padding，忽略
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++ptr;
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continue;
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}
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//15类型的rtp ext为保留
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CHECK(ext->getId() < (uint8_t) RtpExtType::reserved);
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CHECK(reinterpret_cast<uint8_t *>(ext) + RtpExtTwoByte::kMinSize <= end);
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CHECK(ext->getData() + ext->getSize() <= end);
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ret.emplace(ext->getId(), RtpExt(type, reinterpret_cast<char *>(ext->getData()), ext->getSize()));
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ptr += RtpExtTwoByte::kMinSize + ext->getSize();
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}
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appendExt<RtpExtTwoByte>(ret, media, ptr, end);
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return ret;
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}
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return ret;
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}
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#define RTP_EXT_MAP(XX) \
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XX(RtpExtType::ssrc_audio_level, "urn:ietf:params:rtp-hdrext:ssrc-audio-level") \
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XX(RtpExtType::abs_send_time, "http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time") \
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XX(RtpExtType::transport_cc, "http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01") \
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XX(RtpExtType::sdes_mid, "urn:ietf:params:rtp-hdrext:sdes:mid") \
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XX(RtpExtType::sdes_rtp_stream_id, "urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id") \
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XX(RtpExtType::sdes_repaired_rtp_stream_id, "urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id") \
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XX(RtpExtType::video_timing, "http://www.webrtc.org/experiments/rtp-hdrext/video-timing") \
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XX(RtpExtType::color_space, "http://www.webrtc.org/experiments/rtp-hdrext/color-space") \
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XX(RtpExtType::video_content_type, "http://www.webrtc.org/experiments/rtp-hdrext/video-content-type") \
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XX(RtpExtType::playout_delay, "http://www.webrtc.org/experiments/rtp-hdrext/playout-delay") \
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XX(RtpExtType::video_orientation, "urn:3gpp:video-orientation") \
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XX(RtpExtType::toffset, "urn:ietf:params:rtp-hdrext:toffset")
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XX(ssrc_audio_level, "urn:ietf:params:rtp-hdrext:ssrc-audio-level") \
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XX(abs_send_time, "http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time") \
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XX(transport_cc, "http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01") \
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XX(sdes_mid, "urn:ietf:params:rtp-hdrext:sdes:mid") \
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XX(sdes_rtp_stream_id, "urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id") \
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XX(sdes_repaired_rtp_stream_id, "urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id") \
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XX(video_timing, "http://www.webrtc.org/experiments/rtp-hdrext/video-timing") \
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XX(color_space, "http://www.webrtc.org/experiments/rtp-hdrext/color-space") \
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XX(video_content_type, "http://www.webrtc.org/experiments/rtp-hdrext/video-content-type") \
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XX(playout_delay, "http://www.webrtc.org/experiments/rtp-hdrext/playout-delay") \
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XX(video_orientation, "urn:3gpp:video-orientation") \
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XX(toffset, "urn:ietf:params:rtp-hdrext:toffset")
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#define XX(type, url) {type , url},
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#define XX(type, url) {RtpExtType::type , url},
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static unordered_map<RtpExtType/*id*/, string/*ext*/> s_type_to_url = {RTP_EXT_MAP(XX)};
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#undef XX
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#define XX(type, url) {url, type},
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#define XX(type, url) {url, RtpExtType::type},
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static unordered_map<string/*ext*/, RtpExtType/*id*/> s_url_to_type = {RTP_EXT_MAP(XX)};
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#undef XX
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@ -197,3 +196,17 @@ const string &RtpExt::getExtUrl(RtpExtType type) {
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return it->second;
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}
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const char *RtpExt::getExtName(RtpExtType type) {
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#define XX(type, url) case RtpExtType::type: return #type;
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switch (type) {
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RTP_EXT_MAP(XX)
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default: return "unknown ext type";
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}
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#undef XX
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}
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string RtpExt::dumpString() const {
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_StrPrinter printer;
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printer << getExtName(_type) << ", id:" << (int)_id << " " << hexdump(data(), size());
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return std::move(printer);
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}
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@ -41,16 +41,19 @@ class RtcMedia;
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class RtpExt : public std::string {
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public:
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RtpExt(RtpExtType type, uint8_t id, const char *str, size_t size) : std::string(str, size), _type(type), _id(id) {}
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~RtpExt() = default;
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static map<uint8_t/*id*/, RtpExt/*data*/> getExtValue(const RtpHeader *header, const RtcMedia &media);
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static map<RtpExtType/*type*/, RtpExt/*data*/> getExtValue(const RtpHeader *header, const RtcMedia &media);
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static RtpExtType getExtType(const string &url);
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static const string& getExtUrl(RtpExtType type);
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static const char *getExtName(RtpExtType type);
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private:
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RtpExt(RtpExtType type, const char *str, size_t size) : std::string(str, size), _type(type) {}
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string dumpString() const;
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private:
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RtpExtType _type;
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uint8_t _id;
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};
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