mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-10-06 12:13:49 +08:00
394 lines
14 KiB
C++
394 lines
14 KiB
C++
/*
|
||
* Copyright (c) 2016-present The ZLMediaKit project authors. All Rights Reserved.
|
||
*
|
||
* This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
|
||
*
|
||
* Use of this source code is governed by MIT-like license that can be found in the
|
||
* LICENSE file in the root of the source tree. All contributing project authors
|
||
* may be found in the AUTHORS file in the root of the source tree.
|
||
*/
|
||
|
||
#include "H265Rtp.h"
|
||
#include "Common/config.h"
|
||
namespace mediakit{
|
||
|
||
//https://datatracker.ietf.org/doc/rfc7798/
|
||
// H265 nalu 头两个字节的定义 [AUTO-TRANSLATED:d896dd59]
|
||
// H265 nalu header definition of the first two bytes
|
||
/*
|
||
0 1
|
||
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
|F| Type | LayerId | TID |
|
||
+-------------+-----------------+
|
||
Forbidden zero(F) : 1 bit
|
||
NAL unit type(Type) : 6 bits
|
||
NUH layer ID(LayerId) : 6 bits
|
||
NUH temporal ID plus 1 (TID) : 3 bits
|
||
*/
|
||
|
||
H265RtpDecoder::H265RtpDecoder() {
|
||
_frame = obtainFrame();
|
||
}
|
||
|
||
H265Frame::Ptr H265RtpDecoder::obtainFrame() {
|
||
auto frame = FrameImp::create<H265Frame>();
|
||
frame->_prefix_size = 4;
|
||
return frame;
|
||
}
|
||
|
||
#define AV_RB16(x) \
|
||
((((const uint8_t*)(x))[0] << 8) | \
|
||
((const uint8_t*)(x))[1])
|
||
|
||
#define CHECK_SIZE(total, size, ret) \
|
||
if (total < size) { \
|
||
WarnL << "invalid rtp data size:" << total << " < " << size << ",rtp:\r\n" << rtp->dumpString(); _gop_dropped = true; return ret; \
|
||
}
|
||
|
||
// 4.4.2. Aggregation Packets (APs) (p25)
|
||
/*
|
||
0 1 2 3
|
||
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
| RTP Header |
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
| PayloadHdr (Type=48) | NALU 1 DONL |
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
| NALU 1 Size | NALU 1 HDR |
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
| |
|
||
| NALU 1 Data . . . |
|
||
| |
|
||
+ . . . +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
| | NALU 2 DOND | NALU 2 Size |
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
| NALU 2 HDR | |
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ NALU 2 Data |
|
||
| |
|
||
| . . . +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
| : ...OPTIONAL RTP padding |
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
*/
|
||
bool H265RtpDecoder::unpackAp(const RtpPacket::Ptr &rtp, const uint8_t *ptr, ssize_t size, uint64_t stamp){
|
||
bool have_key_frame = false;
|
||
// 忽略PayloadHdr [AUTO-TRANSLATED:9868ddb5]
|
||
// Ignore PayloadHdr
|
||
CHECK_SIZE(size, 2, have_key_frame);
|
||
ptr += 2;
|
||
size -= 2;
|
||
|
||
while (size) {
|
||
if (_using_donl_field) {
|
||
CHECK_SIZE(size, 2, have_key_frame);
|
||
uint16_t donl = AV_RB16(ptr);
|
||
size -= 2;
|
||
ptr += 2;
|
||
}
|
||
CHECK_SIZE(size, 2, have_key_frame);
|
||
uint16_t nalu_size = AV_RB16(ptr);
|
||
size -= 2;
|
||
ptr += 2;
|
||
CHECK_SIZE(size, nalu_size, have_key_frame)
|
||
if (singleFrame(rtp, ptr, nalu_size, stamp)) {
|
||
have_key_frame = true;
|
||
}
|
||
size -= nalu_size;
|
||
ptr += nalu_size;
|
||
}
|
||
return have_key_frame;
|
||
}
|
||
|
||
// 4.4.3. Fragmentation Units (p29)
|
||
/*
|
||
0 1 2 3
|
||
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
| PayloadHdr (Type=49) | FU header | DONL (cond) |
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-|
|
||
| DONL (cond) | |
|
||
|-+-+-+-+-+-+-+-+ |
|
||
| FU payload |
|
||
| |
|
||
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
| : ...OPTIONAL RTP padding |
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
|
||
+---------------+
|
||
|0|1|2|3|4|5|6|7|
|
||
+-+-+-+-+-+-+-+-+
|
||
|S|E| FuType |
|
||
+---------------+
|
||
*/
|
||
|
||
bool H265RtpDecoder::mergeFu(const RtpPacket::Ptr &rtp, const uint8_t *ptr, ssize_t size, uint64_t stamp, uint16_t seq){
|
||
CHECK_SIZE(size, 4, false);
|
||
auto s_bit = ptr[2] >> 7;
|
||
auto e_bit = (ptr[2] >> 6) & 0x01;
|
||
auto type = ptr[2] & 0x3f;
|
||
if (s_bit) {
|
||
// 该帧的第一个rtp包 [AUTO-TRANSLATED:a9581a23]
|
||
// The first rtp packet of this frame
|
||
_frame->_buffer.assign("\x00\x00\x00\x01", 4);
|
||
_frame->_buffer.push_back((type << 1) | (ptr[0] & 0x81));
|
||
_frame->_buffer.push_back(ptr[1]);
|
||
_frame->_pts = stamp;
|
||
_fu_dropped = false;
|
||
}
|
||
|
||
if (_fu_dropped) {
|
||
// 该帧不完整 [AUTO-TRANSLATED:6bd7eca7]
|
||
// This frame is incomplete
|
||
return false;
|
||
}
|
||
|
||
if (!s_bit && seq != (uint16_t) (_last_seq + 1)) {
|
||
// 中间的或末尾的rtp包，其seq必须连续，否则说明rtp丢包，那么该帧不完整，必须得丢弃 [AUTO-TRANSLATED:6953b332]
|
||
// The middle or end rtp packet, its seq must be continuous, otherwise it means rtp packet loss, then this frame is incomplete and must be discarded
|
||
_fu_dropped = true;
|
||
_frame->_buffer.clear();
|
||
return false;
|
||
}
|
||
|
||
// 跳过PayloadHdr + FU header [AUTO-TRANSLATED:51ec6760]
|
||
// Skip PayloadHdr + FU header
|
||
ptr += 3;
|
||
size -= 3;
|
||
if (_using_donl_field) {
|
||
// DONL确保不少于2个字节 [AUTO-TRANSLATED:7e72ecc1]
|
||
// DONL must be no less than 2 bytes
|
||
CHECK_SIZE(size, 2, false);
|
||
uint16_t donl = AV_RB16(ptr);
|
||
size -= 2;
|
||
ptr += 2;
|
||
}
|
||
|
||
CHECK_SIZE(size, 1, false);
|
||
|
||
// 后面追加数据 [AUTO-TRANSLATED:248516e9]
|
||
// Append data later
|
||
_frame->_buffer.append((char *) ptr, size);
|
||
|
||
if (!e_bit) {
|
||
// 非末尾包 [AUTO-TRANSLATED:2e43ac3c]
|
||
// Non-end packet
|
||
return s_bit ? (_frame->keyFrame() || _frame->configFrame()) : false;
|
||
}
|
||
|
||
// 确保下一次fu必须收到第一个包 [AUTO-TRANSLATED:491d81ec]
|
||
// Ensure that the next fu must receive the first packet
|
||
_fu_dropped = true;
|
||
// 该帧最后一个rtp包 [AUTO-TRANSLATED:ea395f0e]
|
||
// The last rtp packet of this frame
|
||
outputFrame(rtp, _frame);
|
||
return false;
|
||
}
|
||
|
||
bool H265RtpDecoder::inputRtp(const RtpPacket::Ptr &rtp, bool) {
|
||
auto seq = rtp->getSeq();
|
||
auto last_is_gop = _is_gop;
|
||
_is_gop = decodeRtp(rtp);
|
||
if (!_gop_dropped && seq != (uint16_t) (_last_seq + 1) && _last_seq) {
|
||
_gop_dropped = true;
|
||
WarnL << "start drop h265 gop, last seq:" << _last_seq << ", rtp:\r\n" << rtp->dumpString();
|
||
}
|
||
_last_seq = seq;
|
||
// 确保有sps rtp的时候，gop从sps开始；否则从关键帧开始 [AUTO-TRANSLATED:115ae07c]
|
||
// Ensure that when there is sps rtp, gop starts from sps; otherwise, it starts from the key frame
|
||
return _is_gop && !last_is_gop;
|
||
}
|
||
|
||
bool H265RtpDecoder::decodeRtp(const RtpPacket::Ptr &rtp) {
|
||
auto payload_size = rtp->getPayloadSize();
|
||
if (payload_size <= 0) {
|
||
// 无实际负载 [AUTO-TRANSLATED:305af48f]
|
||
// No actual payload
|
||
return false;
|
||
}
|
||
auto frame = rtp->getPayload();
|
||
auto stamp = rtp->getStampMS();
|
||
auto seq = rtp->getSeq();
|
||
int nal = H265_TYPE(frame[0]);
|
||
|
||
switch (nal) {
|
||
case 48:
|
||
// aggregated packet (AP) - with two or more NAL units
|
||
return unpackAp(rtp, frame, payload_size, stamp);
|
||
|
||
case 49:
|
||
// fragmentation unit (FU)
|
||
return mergeFu(rtp, frame, payload_size, stamp, seq);
|
||
|
||
default: {
|
||
if (nal < 48) {
|
||
// Single NAL Unit Packets (p24)
|
||
return singleFrame(rtp, frame, payload_size, stamp);
|
||
}
|
||
_gop_dropped = true;
|
||
WarnL << "不支持该类型的265 RTP包, nal type" << nal << ", rtp:\r\n" << rtp->dumpString();
|
||
return false;
|
||
}
|
||
}
|
||
}
|
||
|
||
bool H265RtpDecoder::singleFrame(const RtpPacket::Ptr &rtp, const uint8_t *ptr, ssize_t size, uint64_t stamp){
|
||
_frame->_buffer.assign("\x00\x00\x00\x01", 4);
|
||
_frame->_buffer.append((char *) ptr, size);
|
||
_frame->_pts = stamp;
|
||
auto key = _frame->keyFrame() || _frame->configFrame();
|
||
outputFrame(rtp, _frame);
|
||
return key;
|
||
}
|
||
|
||
void H265RtpDecoder::outputFrame(const RtpPacket::Ptr &rtp, const H265Frame::Ptr &frame) {
|
||
if (frame->dropAble()) {
|
||
// 不参与dts生成 [AUTO-TRANSLATED:dff3b747]
|
||
// Not involved in dts generation
|
||
frame->_dts = frame->_pts;
|
||
} else {
|
||
// rtsp没有dts，那么根据pts排序算法生成dts [AUTO-TRANSLATED:f37c17f3]
|
||
// rtsp does not have dts, so dts is generated according to the pts sorting algorithm
|
||
_dts_generator.getDts(frame->_pts, frame->_dts);
|
||
}
|
||
|
||
if (frame->keyFrame() && _gop_dropped) {
|
||
_gop_dropped = false;
|
||
InfoL << "new gop received, rtp:\r\n" << rtp->dumpString();
|
||
}
|
||
if (!_gop_dropped || frame->configFrame()) {
|
||
RtpCodec::inputFrame(frame);
|
||
}
|
||
_frame = obtainFrame();
|
||
}
|
||
|
||
////////////////////////////////////////////////////////////////////////
|
||
|
||
void H265RtpEncoder::packRtpFu(const char *ptr, size_t len, uint64_t pts, bool is_mark, bool gop_pos){
|
||
auto max_size = getRtpInfo().getMaxSize() - 3;
|
||
auto nal_type = H265_TYPE(ptr[0]); //获取NALU的5bit 帧类型
|
||
unsigned char s_e_flags;
|
||
bool fu_start = true;
|
||
bool mark_bit = false;
|
||
size_t offset = 2;
|
||
while (!mark_bit) {
|
||
if (len <= offset + max_size) {
|
||
// FU end
|
||
mark_bit = true;
|
||
max_size = len - offset;
|
||
s_e_flags = (1 << 6) | nal_type;
|
||
} else if (fu_start) {
|
||
// FU start
|
||
s_e_flags = (1 << 7) | nal_type;
|
||
} else {
|
||
// FU mid
|
||
s_e_flags = nal_type;
|
||
}
|
||
|
||
{
|
||
// 传入nullptr先不做payload的内存拷贝 [AUTO-TRANSLATED:7ed49f0a]
|
||
// Pass in nullptr first, do not copy the payload memory
|
||
auto rtp = getRtpInfo().makeRtp(TrackVideo, nullptr, max_size + 3, mark_bit, pts);
|
||
// rtp payload 负载部分 [AUTO-TRANSLATED:03a5ef9b]
|
||
// rtp payload load part
|
||
uint8_t *payload = rtp->getPayload();
|
||
// FU 第1个字节，表明为FU [AUTO-TRANSLATED:9cf07fda]
|
||
// FU first byte, indicating FU
|
||
payload[0] = 49 << 1;
|
||
// FU 第2个字节貌似固定为1 [AUTO-TRANSLATED:77983091]
|
||
// FU second byte seems to be fixed to 1
|
||
payload[1] = ptr[1]; // 1;
|
||
// FU 第3个字节 [AUTO-TRANSLATED:c627abd0]
|
||
// FU third byte
|
||
payload[2] = s_e_flags;
|
||
// H265 数据 [AUTO-TRANSLATED:a2c3135f]
|
||
// H265 data
|
||
memcpy(payload + 3, ptr + offset, max_size);
|
||
// 输入到rtp环形缓存 [AUTO-TRANSLATED:6bafd42b]
|
||
// Input to rtp ring buffer
|
||
RtpCodec::inputRtp(rtp, fu_start && gop_pos);
|
||
}
|
||
|
||
offset += max_size;
|
||
fu_start = false;
|
||
}
|
||
}
|
||
|
||
void H265RtpEncoder::packRtp(const char *ptr, size_t len, uint64_t pts, bool is_mark, bool gop_pos){
|
||
if (len <= getRtpInfo().getMaxSize()) {
|
||
//signal-nalu
|
||
RtpCodec::inputRtp(getRtpInfo().makeRtp(TrackVideo, ptr, len, is_mark, pts), gop_pos);
|
||
} else {
|
||
// FU-A模式 [AUTO-TRANSLATED:a273a49c]
|
||
// FU-A mode
|
||
packRtpFu(ptr, len, pts, is_mark, gop_pos);
|
||
}
|
||
}
|
||
void H265RtpEncoder::insertConfigFrame(uint64_t pts){
|
||
if (!_sps || !_pps || !_vps) {
|
||
WarnL<<" not ok";
|
||
return;
|
||
}
|
||
// gop缓存从vps 开始，vps ,sps、pps后面还有时间戳相同的关键帧，所以mark bit为false [AUTO-TRANSLATED:2534b06f]
|
||
// gop cache starts from vps, vps, sps, pps followed by key frames with the same timestamp, so mark bit is false
|
||
packRtp(_vps->data() + _vps->prefixSize(), _vps->size() - _vps->prefixSize(), pts, false, true);
|
||
packRtp(_sps->data() + _sps->prefixSize(), _sps->size() - _sps->prefixSize(), pts, false, false);
|
||
packRtp(_pps->data() + _pps->prefixSize(), _pps->size() - _pps->prefixSize(), pts, false, false);
|
||
|
||
}
|
||
bool H265RtpEncoder::inputFrame_l(const Frame::Ptr &frame, bool is_mark){
|
||
if (frame->keyFrame()) {
|
||
// 保证每一个关键帧前都有SPS PPS VPS [AUTO-TRANSLATED:9189f8d7]
|
||
// Ensure that there are SPS PPS VPS before each key frame
|
||
insertConfigFrame(frame->pts());
|
||
}
|
||
packRtp(frame->data() + frame->prefixSize(), frame->size() - frame->prefixSize(), frame->pts(), is_mark, false);
|
||
return true;
|
||
}
|
||
bool H265RtpEncoder::inputFrame(const Frame::Ptr &frame) {
|
||
auto ptr = (uint8_t *) frame->data() + frame->prefixSize();
|
||
auto nal_type = H265_TYPE(ptr[0]); //获取NALU的5bit 帧类型
|
||
|
||
switch (nal_type) {
|
||
case H265Frame::NAL_SPS: {
|
||
_sps = Frame::getCacheAbleFrame(frame);
|
||
return true;
|
||
}
|
||
case H265Frame::NAL_PPS: {
|
||
_pps = Frame::getCacheAbleFrame(frame);
|
||
return true;
|
||
}
|
||
case H265Frame::NAL_VPS:{
|
||
_vps = Frame::getCacheAbleFrame(frame);
|
||
return true;
|
||
}
|
||
default: break;
|
||
}
|
||
|
||
GET_CONFIG(int,lowLatency,Rtp::kLowLatency);
|
||
if (lowLatency) { // 低延迟模式
|
||
if (_last_frame) {
|
||
flush();
|
||
}
|
||
inputFrame_l(frame, true);
|
||
} else {
|
||
if (_last_frame) {
|
||
// 如果时间戳发生了变化，那么markbit才置true [AUTO-TRANSLATED:19b68429]
|
||
// If the timestamp changes, then markbit is set to true
|
||
inputFrame_l(_last_frame, _last_frame->pts() != frame->pts());
|
||
}
|
||
_last_frame = Frame::getCacheAbleFrame(frame);
|
||
}
|
||
return true;
|
||
}
|
||
|
||
void H265RtpEncoder::flush() {
|
||
if (_last_frame) {
|
||
// 如果时间戳发生了变化，那么markbit才置true [AUTO-TRANSLATED:6b1d0fe0]
|
||
// If the timestamp changes, then markbit is set to true
|
||
inputFrame_l(_last_frame, true);
|
||
_last_frame = nullptr;
|
||
}
|
||
}
|
||
|
||
}//namespace mediakit
|