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Improve perforance of marshaling RTP header

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This commit is contained in:
winlin 2020-04-16 18:04:56 +08:00
parent 3bd56bb3a3
commit 634225f92f
2 changed files with 39 additions and 8 deletions
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45
trunk/src/kernel/srs_kernel_rtp.cpp
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@ -83,6 +83,12 @@ srs_error_t SrsRtpHeader::encode(SrsBuffer* stream)
{
srs_error_t err = srs_success;
// Encode the RTP fix header, 12bytes.
// @see https://tools.ietf.org/html/rfc1889#section-5.1
char* op = stream->data() + stream->pos();
char* p = op;
// The version, padding, extension and cc, total 1 byte.
uint8_t v = 0x80 | cc;
if (padding) {
v |= 0x20;
@ -90,25 +96,50 @@ srs_error_t SrsRtpHeader::encode(SrsBuffer* stream)
if (extension) {
v |= 0x10;
}
stream->write_1bytes(v);
*p++ = v;
// The marker and payload type, total 1 byte.
v = payload_type;
if (marker) {
v |= kRtpMarker;
}
stream->write_1bytes(v);
*p++ = v;
stream->write_2bytes(sequence);
stream->write_4bytes(timestamp);
stream->write_4bytes(ssrc);
// The sequence number, 2 bytes.
char* pp = (char*)&sequence;
*p++ = pp[1];
*p++ = pp[0];
// The timestamp, 4 bytes.
pp = (char*)&timestamp;
*p++ = pp[3];
*p++ = pp[2];
*p++ = pp[1];
*p++ = pp[0];
// The SSRC, 4 bytes.
pp = (char*)&ssrc;
*p++ = pp[3];
*p++ = pp[2];
*p++ = pp[1];
*p++ = pp[0];
// The CSRC list: 0 to 15 items, each is 4 bytes.
for (size_t i = 0; i < cc; ++i) {
stream->write_4bytes(csrc[i]);
pp = (char*)&csrc[i];
*p++ = pp[3];
*p++ = pp[2];
*p++ = pp[1];
*p++ = pp[0];
}
// TODO: Write exteinsion field.
if (extension) {
}
// Consume the data.
stream->skip(p - op);
return err;
}
@ -134,7 +165,7 @@ void SrsRtpHeader::set_sequence(uint16_t sequence)
void SrsRtpHeader::set_timestamp(int64_t timestamp)
{
this->timestamp = timestamp;
this->timestamp = (uint32_t)timestamp;
}
void SrsRtpHeader::set_ssrc(uint32_t ssrc)

2
trunk/src/kernel/srs_kernel_rtp.hpp
View file

@ -50,7 +50,7 @@ private:
bool marker;
uint8_t payload_type;
uint16_t sequence;
int64_t timestamp;
int32_t timestamp;
uint32_t ssrc;
uint32_t csrc[15];
uint16_t extension_length;