mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-26 12:37:09 +08:00
367 lines
12 KiB
C++
367 lines
12 KiB
C++
/*
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* Copyright (c) 2016-present The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
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*
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* Use of this source code is governed by MIT-like license that can be found in the
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* LICENSE file in the root of the source tree. All contributing project authors
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* may be found in the AUTHORS file in the root of the source tree.
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*/
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#include "H265Rtp.h"
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#include "Common/config.h"
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namespace mediakit{
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//https://datatracker.ietf.org/doc/rfc7798/
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//H265 nalu 头两个字节的定义
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/*
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0 1
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|F| Type | LayerId | TID |
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+-------------+-----------------+
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Forbidden zero(F) : 1 bit
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NAL unit type(Type) : 6 bits
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NUH layer ID(LayerId) : 6 bits
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NUH temporal ID plus 1 (TID) : 3 bits
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*/
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H265RtpDecoder::H265RtpDecoder() {
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_frame = obtainFrame();
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}
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H265Frame::Ptr H265RtpDecoder::obtainFrame() {
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auto frame = FrameImp::create<H265Frame>();
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frame->_prefix_size = 4;
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return frame;
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}
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#define AV_RB16(x) \
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((((const uint8_t*)(x))[0] << 8) | \
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((const uint8_t*)(x))[1])
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#define CHECK_SIZE(total, size, ret) \
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if (total < size) { \
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WarnL << "invalid rtp data size:" << total << " < " << size << ",rtp:\r\n" << rtp->dumpString(); _gop_dropped = true; return ret; \
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}
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// 4.4.2. Aggregation Packets (APs) (p25)
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/*
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0 1 2 3
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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
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| RTP Header |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| PayloadHdr (Type=48) | NALU 1 DONL |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| NALU 1 Size | NALU 1 HDR |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| |
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| NALU 1 Data . . . |
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| |
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+ . . . +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| | NALU 2 DOND | NALU 2 Size |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| NALU 2 HDR | |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ NALU 2 Data |
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| |
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| . . . +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| : ...OPTIONAL RTP padding |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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bool H265RtpDecoder::unpackAp(const RtpPacket::Ptr &rtp, const uint8_t *ptr, ssize_t size, uint64_t stamp){
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bool have_key_frame = false;
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//忽略PayloadHdr
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CHECK_SIZE(size, 2, have_key_frame);
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ptr += 2;
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size -= 2;
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while (size) {
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if (_using_donl_field) {
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CHECK_SIZE(size, 2, have_key_frame);
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uint16_t donl = AV_RB16(ptr);
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size -= 2;
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ptr += 2;
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}
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CHECK_SIZE(size, 2, have_key_frame);
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uint16_t nalu_size = AV_RB16(ptr);
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size -= 2;
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ptr += 2;
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CHECK_SIZE(size, nalu_size, have_key_frame)
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if (singleFrame(rtp, ptr, nalu_size, stamp)) {
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have_key_frame = true;
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}
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size -= nalu_size;
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ptr += nalu_size;
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}
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return have_key_frame;
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}
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// 4.4.3. Fragmentation Units (p29)
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/*
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0 1 2 3
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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
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| PayloadHdr (Type=49) | FU header | DONL (cond) |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-|
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| DONL (cond) | |
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|-+-+-+-+-+-+-+-+ |
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| FU payload |
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| |
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| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| : ...OPTIONAL RTP padding |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+---------------+
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|0|1|2|3|4|5|6|7|
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+-+-+-+-+-+-+-+-+
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|S|E| FuType |
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+---------------+
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*/
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bool H265RtpDecoder::mergeFu(const RtpPacket::Ptr &rtp, const uint8_t *ptr, ssize_t size, uint64_t stamp, uint16_t seq){
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CHECK_SIZE(size, 4, false);
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auto s_bit = ptr[2] >> 7;
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auto e_bit = (ptr[2] >> 6) & 0x01;
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auto type = ptr[2] & 0x3f;
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if (s_bit) {
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//该帧的第一个rtp包
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_frame->_buffer.assign("\x00\x00\x00\x01", 4);
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_frame->_buffer.push_back((type << 1) | (ptr[0] & 0x81));
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_frame->_buffer.push_back(ptr[1]);
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_frame->_pts = stamp;
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_fu_dropped = false;
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}
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if (_fu_dropped) {
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//该帧不完整
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return false;
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}
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if (!s_bit && seq != (uint16_t) (_last_seq + 1)) {
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//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
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_fu_dropped = true;
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_frame->_buffer.clear();
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return false;
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}
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//跳过PayloadHdr + FU header
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ptr += 3;
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size -= 3;
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if (_using_donl_field) {
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//DONL确保不少于2个字节
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CHECK_SIZE(size, 2, false);
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uint16_t donl = AV_RB16(ptr);
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size -= 2;
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ptr += 2;
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}
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CHECK_SIZE(size, 1, false);
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//后面追加数据
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_frame->_buffer.append((char *) ptr, size);
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if (!e_bit) {
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//非末尾包
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return s_bit ? (_frame->keyFrame() || _frame->configFrame()) : false;
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}
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//确保下一次fu必须收到第一个包
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_fu_dropped = true;
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//该帧最后一个rtp包
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outputFrame(rtp, _frame);
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return false;
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}
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bool H265RtpDecoder::inputRtp(const RtpPacket::Ptr &rtp, bool) {
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auto seq = rtp->getSeq();
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auto last_is_gop = _is_gop;
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_is_gop = decodeRtp(rtp);
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if (!_gop_dropped && seq != (uint16_t) (_last_seq + 1) && _last_seq) {
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_gop_dropped = true;
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WarnL << "start drop h265 gop, last seq:" << _last_seq << ", rtp:\r\n" << rtp->dumpString();
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}
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_last_seq = seq;
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// 确保有sps rtp的时候，gop从sps开始；否则从关键帧开始
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return _is_gop && !last_is_gop;
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}
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bool H265RtpDecoder::decodeRtp(const RtpPacket::Ptr &rtp) {
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auto payload_size = rtp->getPayloadSize();
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if (payload_size <= 0) {
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//无实际负载
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return false;
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}
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auto frame = rtp->getPayload();
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auto stamp = rtp->getStampMS();
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auto seq = rtp->getSeq();
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int nal = H265_TYPE(frame[0]);
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switch (nal) {
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case 48:
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// aggregated packet (AP) - with two or more NAL units
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return unpackAp(rtp, frame, payload_size, stamp);
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case 49:
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// fragmentation unit (FU)
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return mergeFu(rtp, frame, payload_size, stamp, seq);
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default: {
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if (nal < 48) {
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// Single NAL Unit Packets (p24)
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return singleFrame(rtp, frame, payload_size, stamp);
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}
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_gop_dropped = true;
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WarnL << "不支持该类型的265 RTP包, nal type" << nal << ", rtp:\r\n" << rtp->dumpString();
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return false;
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}
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}
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}
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bool H265RtpDecoder::singleFrame(const RtpPacket::Ptr &rtp, const uint8_t *ptr, ssize_t size, uint64_t stamp){
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_frame->_buffer.assign("\x00\x00\x00\x01", 4);
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_frame->_buffer.append((char *) ptr, size);
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_frame->_pts = stamp;
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auto key = _frame->keyFrame() || _frame->configFrame();
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outputFrame(rtp, _frame);
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return key;
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}
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void H265RtpDecoder::outputFrame(const RtpPacket::Ptr &rtp, const H265Frame::Ptr &frame) {
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if (frame->dropAble()) {
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//不参与dts生成
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frame->_dts = frame->_pts;
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} else {
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//rtsp没有dts，那么根据pts排序算法生成dts
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_dts_generator.getDts(frame->_pts, frame->_dts);
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}
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if (frame->keyFrame() && _gop_dropped) {
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_gop_dropped = false;
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InfoL << "new gop received, rtp:\r\n" << rtp->dumpString();
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}
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if (!_gop_dropped) {
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RtpCodec::inputFrame(frame);
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}
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_frame = obtainFrame();
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}
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////////////////////////////////////////////////////////////////////////
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void H265RtpEncoder::packRtpFu(const char *ptr, size_t len, uint64_t pts, bool is_mark, bool gop_pos){
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auto max_size = getRtpInfo().getMaxSize() - 3;
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auto nal_type = H265_TYPE(ptr[0]); //获取NALU的5bit 帧类型
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unsigned char s_e_flags;
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bool fu_start = true;
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bool mark_bit = false;
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size_t offset = 2;
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while (!mark_bit) {
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if (len <= offset + max_size) {
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// FU end
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mark_bit = true;
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max_size = len - offset;
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s_e_flags = (1 << 6) | nal_type;
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} else if (fu_start) {
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// FU start
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s_e_flags = (1 << 7) | nal_type;
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} else {
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// FU mid
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s_e_flags = nal_type;
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}
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{
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// 传入nullptr先不做payload的内存拷贝
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auto rtp = getRtpInfo().makeRtp(TrackVideo, nullptr, max_size + 3, mark_bit, pts);
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// rtp payload 负载部分
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uint8_t *payload = rtp->getPayload();
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// FU 第1个字节，表明为FU
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payload[0] = 49 << 1;
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// FU 第2个字节貌似固定为1
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payload[1] = ptr[1]; // 1;
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// FU 第3个字节
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payload[2] = s_e_flags;
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// H265 数据
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memcpy(payload + 3, ptr + offset, max_size);
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// 输入到rtp环形缓存
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RtpCodec::inputRtp(rtp, fu_start && gop_pos);
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}
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offset += max_size;
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fu_start = false;
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}
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}
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void H265RtpEncoder::packRtp(const char *ptr, size_t len, uint64_t pts, bool is_mark, bool gop_pos){
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if (len <= getRtpInfo().getMaxSize()) {
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//signal-nalu
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RtpCodec::inputRtp(getRtpInfo().makeRtp(TrackVideo, ptr, len, is_mark, pts), gop_pos);
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} else {
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//FU-A模式
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packRtpFu(ptr, len, pts, is_mark, gop_pos);
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}
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}
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void H265RtpEncoder::insertConfigFrame(uint64_t pts){
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if (!_sps || !_pps || !_vps) {
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WarnL<<" not ok";
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return;
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}
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//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
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packRtp(_vps->data() + _vps->prefixSize(), _vps->size() - _vps->prefixSize(), pts, false, true);
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packRtp(_sps->data() + _sps->prefixSize(), _sps->size() - _sps->prefixSize(), pts, false, false);
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packRtp(_pps->data() + _pps->prefixSize(), _pps->size() - _pps->prefixSize(), pts, false, false);
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}
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bool H265RtpEncoder::inputFrame_l(const Frame::Ptr &frame, bool is_mark){
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if (frame->keyFrame()) {
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//保证每一个关键帧前都有SPS PPS VPS
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insertConfigFrame(frame->pts());
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}
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packRtp(frame->data() + frame->prefixSize(), frame->size() - frame->prefixSize(), frame->pts(), is_mark, false);
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return true;
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}
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bool H265RtpEncoder::inputFrame(const Frame::Ptr &frame) {
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auto ptr = (uint8_t *) frame->data() + frame->prefixSize();
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auto nal_type = H265_TYPE(ptr[0]); //获取NALU的5bit 帧类型
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switch (nal_type) {
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case H265Frame::NAL_SPS: {
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_sps = Frame::getCacheAbleFrame(frame);
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return true;
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}
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case H265Frame::NAL_PPS: {
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_pps = Frame::getCacheAbleFrame(frame);
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return true;
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}
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case H265Frame::NAL_VPS:{
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_vps = Frame::getCacheAbleFrame(frame);
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return true;
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}
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default: break;
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}
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GET_CONFIG(int,lowLatency,Rtp::kLowLatency);
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if (lowLatency) { // 低延迟模式
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if (_last_frame) {
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flush();
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}
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inputFrame_l(frame, true);
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} else {
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if (_last_frame) {
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//如果时间戳发生了变化，那么markbit才置true
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inputFrame_l(_last_frame, _last_frame->pts() != frame->pts());
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}
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_last_frame = Frame::getCacheAbleFrame(frame);
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}
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return true;
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}
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void H265RtpEncoder::flush() {
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if (_last_frame) {
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// 如果时间戳发生了变化，那么markbit才置true
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inputFrame_l(_last_frame, true);
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_last_frame = nullptr;
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}
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}
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}//namespace mediakit
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