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修复fu rtp打包的bug

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This commit is contained in:
xiongziliang
2020-10-24 23:29:21 +08:00
parent 84784f21c4
commit fd898254f2
2 changed files with 38 additions and 41 deletions
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60
src/Extension/H265Rtp.cpp
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@@ -18,10 +18,10 @@ namespace mediakit{
//44 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//45 |F| Type | LayerId | TID |
//46 +-------------+-----------------+
//48 F = 0
//49 Type = 49 (fragmentation unit (FU))
//50 LayerId = 0
//51 TID = 1
//48 F = 0, 1bit
//49 Type = 49 (fragmentation unit (FU)), 6bit
//50 LayerId = 0, 6bit
//51 TID = 1, 3bit
//56 /*
//57 create the FU header
//58
@@ -29,7 +29,6 @@ namespace mediakit{
//60 +-+-+-+-+-+-+-+-+
//61 |S|E| FuType |
//62 +---------------+
//63
//64 S = variable
//65 E = variable
//66 FuType = NAL unit type
@@ -150,40 +149,39 @@ H265RtpEncoder::H265RtpEncoder(uint32_t ui32Ssrc,
}
void H265RtpEncoder::inputFrame(const Frame::Ptr &frame) {
GET_CONFIG(uint32_t,cycleMS,Rtp::kCycleMS);
uint8_t *pcData = (uint8_t*)frame->data() + frame->prefixSize();
auto uiStamp = frame->pts();
auto iLen = frame->size() - frame->prefixSize();
unsigned char naluType = H265_TYPE(pcData[0]); //获取NALU的5bit 帧类型
uiStamp %= cycleMS;
GET_CONFIG(uint32_t, cycleMS, Rtp::kCycleMS);
auto ptr = (uint8_t *) frame->data() + frame->prefixSize();
auto len = frame->size() - frame->prefixSize();
auto pts = frame->pts() % cycleMS;
auto nal_type = H265_TYPE(ptr[0]); //获取NALU的5bit 帧类型
auto payload_size = _ui32MtuSize - 3;
int maxSize = _ui32MtuSize - 3;
//超过MTU,按照FU方式打包
if (iLen > maxSize) {
if (len > payload_size + 2) {
//获取帧头数据，1byte
unsigned char s_e_flags;
bool bFirst = true;
bool mark = false;
int nOffset = 2;
while (!mark) {
if (iLen <= nOffset + maxSize) { //是否拆分结束
maxSize = iLen - nOffset;
mark = true;
bool fu_start = true;
bool mark_bit = false;
int offset = 2;
while (!mark_bit) {
if (len <= offset + payload_size) {
//FU end
s_e_flags = (1 << 6) | naluType;
} else if (bFirst) {
mark_bit = true;
payload_size = len - offset;
s_e_flags = (1 << 6) | nal_type;
} else if (fu_start) {
//FU start
s_e_flags = (1 << 7) | naluType;
s_e_flags = (1 << 7) | nal_type;
} else {
//FU mid
s_e_flags = naluType;
s_e_flags = nal_type;
}
{
//传入nullptr先不做payload的内存拷贝
auto rtp = makeRtp(getTrackType(), nullptr, maxSize + 3, mark, uiStamp);
auto rtp = makeRtp(getTrackType(), nullptr, payload_size + 3, mark_bit, pts);
//rtp payload 负载部分
uint8_t *payload = (uint8_t*)rtp->data() + rtp->offset;
uint8_t *payload = (uint8_t *) rtp->data() + rtp->offset;
//FU 第1个字节，表明为FU
payload[0] = 49 << 1;
//FU 第2个字节貌似固定为1
@@ -191,16 +189,16 @@ void H265RtpEncoder::inputFrame(const Frame::Ptr &frame) {
//FU 第3个字节
payload[2] = s_e_flags;
//H265 数据
memcpy(payload + 3,pcData + nOffset, maxSize);
memcpy(payload + 3, ptr + offset, payload_size);
//输入到rtp环形缓存
RtpCodec::inputRtp(rtp,bFirst && H265Frame::isKeyFrame(naluType));
RtpCodec::inputRtp(rtp, fu_start && H265Frame::isKeyFrame(nal_type));
}
nOffset += maxSize;
bFirst = false;
offset += payload_size;
fu_start = false;
}
} else {
makeH265Rtp(naluType,pcData, iLen, false, true, uiStamp);
makeH265Rtp(nal_type, ptr, len, false, true, pts);
}
}