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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
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夏楚 2023-06-26 10:04:16 +08:00 committed by GitHub
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commit db8e9182cc
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5 changed files with 32 additions and 10 deletions
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3
conf/config.ini
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@ -281,6 +281,9 @@ videoMtuSize=1400
rtpMaxSize=10
# rtp 打包时，低延迟开关，默认关闭（为0），h264存在一帧多个slice（NAL）的情况，在这种情况下，如果开启可能会导致画面花屏
lowLatency=0
# 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
h264_stap_a=1
[rtp_proxy]
#导出调试数据(包括rtp/ps/h264)至该目录,置空则关闭数据导出

4
src/Common/config.cpp
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@ -244,15 +244,15 @@ const string kVideoMtuSize = RTP_FIELD "videoMtuSize";
const string kAudioMtuSize = RTP_FIELD "audioMtuSize";
// rtp包最大长度限制，单位是KB
const string kRtpMaxSize = RTP_FIELD "rtpMaxSize";
const string kLowLatency = RTP_FIELD "lowLatency";
const string kH264StapA = RTP_FIELD "h264_stap_a";
static onceToken token([]() {
mINI::Instance()[kVideoMtuSize] = 1400;
mINI::Instance()[kAudioMtuSize] = 600;
mINI::Instance()[kRtpMaxSize] = 10;
mINI::Instance()[kLowLatency] = 0;
mINI::Instance()[kH264StapA] = 1;
});
} // namespace Rtp

2
src/Common/config.h
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@ -298,6 +298,8 @@ extern const std::string kAudioMtuSize;
extern const std::string kRtpMaxSize;
// rtp 打包时，低延迟开关，默认关闭（为0），h264存在一帧多个slice（NAL）的情况，在这种情况下，如果开启可能会导致画面花屏
extern const std::string kLowLatency;
//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
extern const std::string kH264StapA;
} // namespace Rtp
////////////组播配置///////////

22
src/Extension/H264Rtp.cpp
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@ -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;
}
@ -257,6 +257,15 @@ 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
auto rtp = makeRtp(getTrackType(), nullptr, len + 3, is_mark, pts);
@ -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])) {

7
src/Extension/H264Rtp.h
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@ -28,7 +28,7 @@ public:
using Ptr = std::shared_ptr<H264RtpDecoder>;
H264RtpDecoder();
~H264RtpDecoder() {}
~H264RtpDecoder() override = default;
/**
* 输入264 rtp包
@ -77,7 +77,8 @@ public:
uint32_t sample_rate = 90000,
uint8_t pt = 96,
uint8_t interleaved = TrackVideo * 2);
~H264RtpEncoder() {}
~H264RtpEncoder() override = default;
/**
* 输入264帧
@ -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;