158 lines
4.5 KiB
C++
158 lines
4.5 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/xiongziliang/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 "Common/config.h"
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#include "RtpReceiver.h"
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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 RTP_MAX_SIZE (10 * 1024)
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namespace mediakit {
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RtpReceiver::RtpReceiver() {
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int index = 0;
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for (auto &sortor : _rtp_sortor) {
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sortor.setOnSort([this, index](uint16_t seq, RtpPacket::Ptr &packet) {
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onRtpSorted(packet, index);
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});
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++index;
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}
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}
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RtpReceiver::~RtpReceiver() {}
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bool RtpReceiver::handleOneRtp(int track_index, TrackType type, int samplerate, unsigned char *rtp_raw_ptr, unsigned int rtp_raw_len) {
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if (rtp_raw_len < 12) {
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WarnL << "rtp包太小:" << rtp_raw_len;
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return false;
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}
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uint8_t padding = 0;
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if (rtp_raw_ptr[0] & 0x20) {
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//获取padding大小
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padding = rtp_raw_ptr[rtp_raw_len - 1];
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//移除padding flag
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rtp_raw_ptr[0] &= ~0x20;
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//移除padding字节
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rtp_raw_len -= padding;
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}
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auto rtp_ptr = _rtp_pool.obtain();
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auto &rtp = *rtp_ptr;
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rtp.type = type;
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rtp.interleaved = 2 * type;
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rtp.mark = rtp_raw_ptr[1] >> 7;
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rtp.PT = rtp_raw_ptr[1] & 0x7F;
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//序列号,内存对齐
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memcpy(&rtp.sequence, rtp_raw_ptr + 2, 2);
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rtp.sequence = ntohs(rtp.sequence);
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//时间戳,内存对齐
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memcpy(&rtp.timeStamp, rtp_raw_ptr + 4, 4);
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rtp.timeStamp = ntohl(rtp.timeStamp);
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if (!samplerate) {
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//无法把时间戳转换成毫秒
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return false;
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}
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//时间戳转换成毫秒
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rtp.timeStamp = rtp.timeStamp * 1000LL / samplerate;
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//ssrc,内存对齐
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memcpy(&rtp.ssrc, rtp_raw_ptr + 8, 4);
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rtp.ssrc = ntohl(rtp.ssrc);
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if (_ssrc[track_index] != rtp.ssrc) {
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if (_ssrc[track_index] == 0) {
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//保存SSRC至track对象
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_ssrc[track_index] = rtp.ssrc;
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} else {
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//ssrc错误
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WarnL << "ssrc错误:" << rtp.ssrc << " != " << _ssrc[track_index];
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if (_ssrc_err_count[track_index]++ > 10) {
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//ssrc切换后清除老数据
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WarnL << "ssrc更换:" << _ssrc[track_index] << " -> " << rtp.ssrc;
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_rtp_sortor[track_index].clear();
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_ssrc[track_index] = rtp.ssrc;
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}
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return false;
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}
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}
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//ssrc匹配正确，不匹配计数清零
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_ssrc_err_count[track_index] = 0;
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//获取rtp中媒体数据偏移量
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rtp.offset = 12 + 4;
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int csrc = rtp_raw_ptr[0] & 0x0f;
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int ext = rtp_raw_ptr[0] & 0x10;
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rtp.offset += 4 * csrc;
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if (ext && rtp_raw_len >= rtp.offset) {
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/* calculate the header extension length (stored as number of 32-bit words) */
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ext = (AV_RB16(rtp_raw_ptr + rtp.offset - 2) + 1) << 2;
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rtp.offset += ext;
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}
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if (rtp_raw_len + 4 <= rtp.offset) {
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WarnL << "无有效负载的rtp包:" << rtp_raw_len << " <= " << (int) rtp.offset;
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return false;
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}
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if (rtp_raw_len > RTP_MAX_SIZE) {
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WarnL << "超大的rtp包:" << rtp_raw_len << " > " << RTP_MAX_SIZE;
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return false;
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}
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//设置rtp负载长度
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rtp.setCapacity(rtp_raw_len + 4);
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rtp.setSize(rtp_raw_len + 4);
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uint8_t *payload_ptr = (uint8_t *) rtp.data();
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payload_ptr[0] = '$';
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payload_ptr[1] = rtp.interleaved;
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payload_ptr[2] = rtp_raw_len >> 8;
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payload_ptr[3] = (rtp_raw_len & 0x00FF);
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//拷贝rtp负载
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memcpy(payload_ptr + 4, rtp_raw_ptr, rtp_raw_len);
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//排序rtp
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sortRtp(std::move(rtp_ptr), track_index);
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return true;
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}
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void RtpReceiver::sortRtp(const RtpPacket::Ptr &rtp,int track_index){
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_rtp_sortor[track_index].sortPacket(rtp->sequence, rtp);
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}
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void RtpReceiver::clear() {
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CLEAR_ARR(_ssrc);
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CLEAR_ARR(_ssrc_err_count);
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for (auto &sortor : _rtp_sortor) {
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sortor.clear();
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}
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}
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void RtpReceiver::setPoolSize(int size) {
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_rtp_pool.setSize(size);
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}
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int RtpReceiver::getJitterSize(int track_index){
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return _rtp_sortor[track_index].getJitterSize();
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}
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int RtpReceiver::getCycleCount(int track_index){
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return _rtp_sortor[track_index].getCycleCount();
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}
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}//namespace mediakit
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