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rtp ext不做内存拷贝

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This commit is contained in:
ziyue 2021-05-13 01:29:55 +08:00
parent 0e968a2d5e
commit a7cd4d0719
2 changed files with 38 additions and 13 deletions
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37
webrtc/RtpExt.cpp
View File

@ -147,9 +147,28 @@ void appendExt(map<uint8_t, RtpExt> &ret, uint8_t *ptr, const uint8_t *end) {
}
}
RtpExt::RtpExt(void *ptr, bool one_byte_ext, const char *str, size_t size) : std::string(str, size) {
_ptr = ptr;
RtpExt::RtpExt(void *ext, bool one_byte_ext, const char *str, size_t size) {
_ext = ext;
_one_byte_ext = one_byte_ext;
_data = str;
_size = size;
}
const char *RtpExt::data() const {
return _data;
}
size_t RtpExt::size() const {
return _size;
}
const char& RtpExt::operator[](size_t pos) const{
CHECK(pos < _size);
return _data[pos];
}
RtpExt::operator std::string() const{
return string(_data, _size);
}
map<uint8_t/*id*/, RtpExt/*data*/> RtpExt::getExtValue(const RtpHeader *header) {
@ -364,7 +383,7 @@ uint16_t RtpExt::getTransportCCSeq() const {
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | ID | len | SDES Item text value ... |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
const string &RtpExt::getSdesMid() const {
string RtpExt::getSdesMid() const {
CHECK(_type == RtpExtType::sdes_mid && size() >= 1);
return *this;
}
@ -515,23 +534,23 @@ uint8_t RtpExt::getFramemarkingTID() const {
}
void RtpExt::setExtId(uint8_t ext_id) {
assert(ext_id > (int) RtpExtType::padding && ext_id <= (int) RtpExtType::reserved && _ptr);
assert(ext_id > (int) RtpExtType::padding && ext_id <= (int) RtpExtType::reserved && _ext);
if (_one_byte_ext) {
auto ptr = reinterpret_cast<RtpExtOneByte *>(_ptr);
auto ptr = reinterpret_cast<RtpExtOneByte *>(_ext);
ptr->setId(ext_id);
} else {
auto ptr = reinterpret_cast<RtpExtTwoByte *>(_ptr);
auto ptr = reinterpret_cast<RtpExtTwoByte *>(_ext);
ptr->setId(ext_id);
}
}
void RtpExt::clearExt(){
assert(_ptr);
assert(_ext);
if (_one_byte_ext) {
auto ptr = reinterpret_cast<RtpExtOneByte *>(_ptr);
auto ptr = reinterpret_cast<RtpExtOneByte *>(_ext);
memset(ptr, (int) RtpExtType::padding, RtpExtOneByte::kMinSize + ptr->getSize());
} else {
auto ptr = reinterpret_cast<RtpExtTwoByte *>(_ptr);
auto ptr = reinterpret_cast<RtpExtTwoByte *>(_ext);
memset(ptr, (int) RtpExtType::padding, RtpExtTwoByte::kMinSize + ptr->getSize());
}
}

14
webrtc/RtpExt.h
View File

@ -45,7 +45,8 @@ enum class RtpExtType : uint8_t {
class RtcMedia;
class RtpExt : public std::string {
//使用次对象的方法前需保证RtpHeader内存未释放
class RtpExt {
public:
template<typename Type>
friend void appendExt(map<uint8_t, RtpExt> &ret, uint8_t *ptr, const uint8_t *end);
@ -63,7 +64,7 @@ public:
uint8_t getAudioLevel(bool *vad) const;
uint32_t getAbsSendTime() const;
uint16_t getTransportCCSeq() const;
const string& getSdesMid() const;
string getSdesMid() const;
string getRtpStreamId() const;
string getRepairedRtpStreamId() const;
@ -88,15 +89,20 @@ public:
uint8_t getFramemarkingTID() const;
//危险函数，必须保证关联的RtpHeader对象有效
void setExtId(uint8_t ext_id);
void clearExt();
private:
RtpExt(void *ptr, bool one_byte_ext, const char *str, size_t size);
const char *data() const;
size_t size() const;
const char& operator[](size_t pos) const;
operator std::string() const;
private:
void *_ptr = nullptr;
void *_ext = nullptr;
const char *_data;
size_t _size;
bool _one_byte_ext = true;
RtpExtType _type = RtpExtType::padding;
};