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新增配置项指定H264 rtp打包是否优先采用stap-a模式 (#2582)

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H264 rtp打包模式是否采用stap-a模式(为了在老版本浏览器上兼容webrtc)还是采用Single NAL unit packet
per H.264 模式 有些老的rtsp设备不支持stap-a rtp，设置此配置为0可提高兼容性
This commit is contained in:
夏楚
2023-06-26 10:04:16 +08:00
committed by GitHub
parent 24d210f61d
commit db8e9182cc
5 changed files with 32 additions and 10 deletions
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24
src/Extension/H264Rtp.cpp
View File

@@ -209,8 +209,8 @@ void H264RtpEncoder::insertConfigFrame(uint64_t pts){
void H264RtpEncoder::packRtp(const char *ptr, size_t len, uint64_t pts, bool is_mark, bool gop_pos){
if (len + 3 <= getMaxSize()) {
//STAP-A模式打包小于MTU
packRtpStapA(ptr, len, pts, is_mark, gop_pos);
// 采用STAP-A/Single NAL unit packet per H.264 模式
packRtpSmallFrame(ptr, len, pts, is_mark, gop_pos);
} else {
//STAP-A模式打包会大于MTU,所以采用FU-A模式
packRtpFu(ptr, len, pts, is_mark, gop_pos);
@@ -220,8 +220,8 @@ void H264RtpEncoder::packRtp(const char *ptr, size_t len, uint64_t pts, bool is_
void H264RtpEncoder::packRtpFu(const char *ptr, size_t len, uint64_t pts, bool is_mark, bool gop_pos){
auto packet_size = getMaxSize() - 2;
if (len <= packet_size + 1) {
//小于FU-A打包最小字节长度要求，采用STAP-A模式
packRtpStapA(ptr, len, pts, is_mark, gop_pos);
// 小于FU-A打包最小字节长度要求，采用STAP-A/Single NAL unit packet per H.264 模式
packRtpSmallFrame(ptr, len, pts, is_mark, gop_pos);
return;
}
@@ -257,8 +257,17 @@ void H264RtpEncoder::packRtpFu(const char *ptr, size_t len, uint64_t pts, bool i
}
}
void H264RtpEncoder::packRtpSmallFrame(const char *data, size_t len, uint64_t pts, bool is_mark, bool gop_pos) {
GET_CONFIG(bool, h264_stap_a, Rtp::kH264StapA);
if (h264_stap_a) {
packRtpStapA(data, len, pts, is_mark, gop_pos);
} else {
packRtpSingleNalu(data, len, pts, is_mark, gop_pos);
}
}
void H264RtpEncoder::packRtpStapA(const char *ptr, size_t len, uint64_t pts, bool is_mark, bool gop_pos){
//如果帧长度不超过mtu,为了兼容性 webrtc，采用STAP-A模式打包
// 如果帧长度不超过mtu,为了兼容性 webrtc，采用STAP-A模式打包
auto rtp = makeRtp(getTrackType(), nullptr, len + 3, is_mark, pts);
uint8_t *payload = rtp->getPayload();
//STAP-A
@@ -270,6 +279,11 @@ void H264RtpEncoder::packRtpStapA(const char *ptr, size_t len, uint64_t pts, boo
RtpCodec::inputRtp(rtp, gop_pos);
}
void H264RtpEncoder::packRtpSingleNalu(const char *data, size_t len, uint64_t pts, bool is_mark, bool gop_pos) {
// Single NAL unit packet per H.264 模式
RtpCodec::inputRtp(makeRtp(getTrackType(), data, len, is_mark, pts), gop_pos);
}
bool H264RtpEncoder::inputFrame(const Frame::Ptr &frame) {
auto ptr = frame->data() + frame->prefixSize();
switch (H264_TYPE(ptr[0])) {

9
src/Extension/H264Rtp.h
View File

@@ -28,7 +28,7 @@ public:
using Ptr = std::shared_ptr<H264RtpDecoder>;
H264RtpDecoder();
~H264RtpDecoder() {}
~H264RtpDecoder() override = default;
/**
* 输入264 rtp包
@@ -77,9 +77,10 @@ public:
uint32_t sample_rate = 90000,
uint8_t pt = 96,
uint8_t interleaved = TrackVideo * 2);
~H264RtpEncoder() {}
/**
~H264RtpEncoder() override = default;
/**
* 输入264帧
* @param frame 帧数据，必须
*/
@@ -96,6 +97,8 @@ private:
void packRtp(const char *data, size_t len, uint64_t pts, bool is_mark, bool gop_pos);
void packRtpFu(const char *data, size_t len, uint64_t pts, bool is_mark, bool gop_pos);
void packRtpStapA(const char *data, size_t len, uint64_t pts, bool is_mark, bool gop_pos);
void packRtpSingleNalu(const char *data, size_t len, uint64_t pts, bool is_mark, bool gop_pos);
void packRtpSmallFrame(const char *data, size_t len, uint64_t pts, bool is_mark, bool gop_pos);
private:
Frame::Ptr _sps;