mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2026-06-16 13:05:59 +08:00
210 lines
7.3 KiB
C++
210 lines
7.3 KiB
C++
/*
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* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
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*
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* Use of this source code is governed by MIT 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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namespace mediakit{
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//41
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//42 0 1
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//43 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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//44 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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//45 |F| Type | LayerId | TID |
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//46 +-------------+-----------------+
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//48 F = 0, 1bit
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//49 Type = 49 (fragmentation unit (FU)), 6bit
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//50 LayerId = 0, 6bit
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//51 TID = 1, 3bit
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//56 /*
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//57 create the FU header
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//58
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//59 0 1 2 3 4 5 6 7
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//60 +-+-+-+-+-+-+-+-+
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//61 |S|E| FuType |
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//62 +---------------+
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//64 S = variable
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//65 E = variable
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//66 FuType = NAL unit type
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//67
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typedef struct {
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unsigned S :1;
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unsigned E :1;
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unsigned type :6;
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} FU;
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static void MakeFU(uint8_t in, FU &fu) {
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fu.S = in >> 7;
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fu.E = (in >> 6) & 0x01;
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fu.type = in & 0x3f;
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}
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H265RtpDecoder::H265RtpDecoder() {
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_h265frame = obtainFrame();
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}
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H265Frame::Ptr H265RtpDecoder::obtainFrame() {
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//从缓存池重新申请对象，防止覆盖已经写入环形缓存的对象
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auto frame = ResourcePoolHelper<H265Frame>::obtainObj();
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frame->_buffer.clear();
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frame->_prefix_size = 4;
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return frame;
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}
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bool H265RtpDecoder::inputRtp(const RtpPacket::Ptr &rtp, bool key_pos) {
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return decodeRtp(rtp);
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}
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bool H265RtpDecoder::decodeRtp(const RtpPacket::Ptr &rtppack) {
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const uint8_t *frame = (uint8_t *) rtppack->data() + rtppack->offset;
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auto length = rtppack->size() - rtppack->offset;
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int nal = H265_TYPE(frame[0]);
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if (nal > 50){
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WarnL << "不支持该类型的265 RTP包" << nal;
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return false; // packet discard, Unsupported (HEVC) NAL type
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}
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switch (nal) {
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case 50:
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case 48: // aggregated packet (AP) - with two or more NAL units
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WarnL << "不支持该类型的265 RTP包" << nal;
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return false;
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case 49: {
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// fragmentation unit (FU)
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FU fu;
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MakeFU(frame[2], fu);
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if (fu.S) {
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//该帧的第一个rtp包
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_h265frame->_buffer.assign("\x0\x0\x0\x1", 4);
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_h265frame->_buffer.push_back(fu.type << 1);
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_h265frame->_buffer.push_back(0x01);
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_h265frame->_buffer.append((char *) frame + 3, length - 3);
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_h265frame->_pts = rtppack->timeStamp;
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//该函数return时，保存下当前sequence,以便下次对比seq是否连续
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_lastSeq = rtppack->sequence;
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return (_h265frame->keyFrame()); //i frame
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}
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if (rtppack->sequence != _lastSeq + 1 && rtppack->sequence != 0) {
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//中间的或末尾的rtp包，其seq必须连续(如果回环了则判定为连续)，否则说明rtp丢包，那么该帧不完整，必须得丢弃
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_h265frame->_buffer.clear();
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WarnL << "rtp丢包: " << rtppack->sequence << " != " << _lastSeq << " + 1,该帧被废弃";
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return false;
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}
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if (!fu.E) {
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//该帧的中间rtp包
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_h265frame->_buffer.append((char *) frame + 3, length - 3);
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//该函数return时，保存下当前sequence,以便下次对比seq是否连续
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_lastSeq = rtppack->sequence;
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return false;
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}
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//该帧最后一个rtp包
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_h265frame->_buffer.append((char *) frame + 3, length - 3);
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_h265frame->_pts = rtppack->timeStamp;
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onGetH265(_h265frame);
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return false;
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}
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default: // 4.4.1. Single NAL Unit Packets (p24)
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//a full frame
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_h265frame->_buffer.assign("\x0\x0\x0\x1", 4);
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_h265frame->_buffer.append((char *)frame, length);
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_h265frame->_pts = rtppack->timeStamp;
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auto key = _h265frame->keyFrame();
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onGetH265(_h265frame);
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return key;
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}
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}
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void H265RtpDecoder::onGetH265(const H265Frame::Ptr &frame) {
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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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//写入环形缓存
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RtpCodec::inputFrame(frame);
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_h265frame = obtainFrame();
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}
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////////////////////////////////////////////////////////////////////////
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H265RtpEncoder::H265RtpEncoder(uint32_t ui32Ssrc,
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uint32_t ui32MtuSize,
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uint32_t ui32SampleRate,
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uint8_t ui8PayloadType,
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uint8_t ui8Interleaved) :
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RtpInfo(ui32Ssrc,
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ui32MtuSize,
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ui32SampleRate,
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ui8PayloadType,
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ui8Interleaved) {
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}
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void H265RtpEncoder::inputFrame(const Frame::Ptr &frame) {
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GET_CONFIG(uint32_t, cycleMS, Rtp::kCycleMS);
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auto ptr = (uint8_t *) frame->data() + frame->prefixSize();
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auto len = frame->size() - frame->prefixSize();
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auto pts = frame->pts() % cycleMS;
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auto nal_type = H265_TYPE(ptr[0]); //获取NALU的5bit 帧类型
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size_t payload_size = _ui32MtuSize - 3;
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//超过MTU,按照FU方式打包
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if (len > payload_size + 2) {
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//获取帧头数据，1byte
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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 + payload_size) {
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//FU end
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mark_bit = true;
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payload_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 = makeRtp(getTrackType(), nullptr, payload_size + 3, mark_bit, pts);
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//rtp payload 负载部分
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uint8_t *payload = (uint8_t *) rtp->data() + rtp->offset;
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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] = 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, payload_size);
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//输入到rtp环形缓存
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RtpCodec::inputRtp(rtp, fu_start && H265Frame::isKeyFrame(nal_type));
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}
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offset += payload_size;
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fu_start = false;
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}
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} else {
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makeH265Rtp(nal_type, ptr, len, false, true, pts);
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}
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}
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void H265RtpEncoder::makeH265Rtp(int nal_type,const void* data, size_t len, bool mark, bool first_packet, uint32_t uiStamp) {
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RtpCodec::inputRtp(makeRtp(getTrackType(),data,len,mark,uiStamp),first_packet && H265Frame::isKeyFrame(nal_type));
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}
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}//namespace mediakit
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