2020-08-01 10:24:28 +08:00
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/*
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2020-08-01 10:22:12 +08:00
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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 "CommonRtp.h"
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#define MAX_FRAME_SIZE 2 * 1024
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CommonRtpDecoder::CommonRtpDecoder(CodecId codec){
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_codec = codec;
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obtainFrame();
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}
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CodecId CommonRtpDecoder::getCodecId() const {
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return _codec;
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}
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void CommonRtpDecoder::obtainFrame() {
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_frame = ResourcePoolHelper<FrameImp>::obtainObj();
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_frame->_buffer.clear();
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_frame->_prefix_size = 0;
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_frame->_dts = 0;
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_frame->_codec_id = _codec;
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}
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bool CommonRtpDecoder::inputRtp(const RtpPacket::Ptr &rtp, bool){
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auto payload = rtp->data() + rtp->offset;
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auto size = rtp->size() - rtp->offset;
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if (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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if (_frame->_dts != rtp->timeStamp || _frame->_buffer.size() > MAX_FRAME_SIZE) {
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//时间戳发生变化或者缓存超过MAX_FRAME_SIZE，则清空上帧数据
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if (!_frame->_buffer.empty()) {
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//有有效帧，则输出
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RtpCodec::inputFrame(_frame);
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}
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//新的一帧数据
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obtainFrame();
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_frame->_dts = rtp->timeStamp;
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_drop_flag = false;
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} else if (_last_seq != 0 && _last_seq + (uint16_t) 1 != rtp->sequence) {
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//时间戳未发生变化，但是seq却不连续，说明中间rtp丢包了，那么整帧应该废弃
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WarnL << "rtp丢包:" << _last_seq << " -> " << rtp->sequence;
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_drop_flag = true;
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_frame->_buffer.clear();
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}
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if (!_drop_flag) {
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_frame->_buffer.append(payload, size);
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}
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_last_seq = rtp->sequence;
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return false;
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}
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////////////////////////////////////////////////////////////////
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CommonRtpEncoder::CommonRtpEncoder(CodecId codec, uint32_t ssrc, uint32_t mtu_size,
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uint32_t sample_rate, uint8_t payload_type, uint8_t interleaved)
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: CommonRtpDecoder(codec), RtpInfo(ssrc, mtu_size, sample_rate, payload_type, interleaved) {
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}
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void CommonRtpEncoder::inputFrame(const Frame::Ptr &frame){
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GET_CONFIG(uint32_t, cycleMS, Rtp::kCycleMS);
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auto stamp = frame->dts() % cycleMS;
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auto ptr = frame->data() + frame->prefixSize();
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auto len = frame->size() - frame->prefixSize();
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auto remain_size = len;
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const auto max_rtp_size = _ui32MtuSize - 20;
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while (remain_size > 0) {
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auto rtp_size = remain_size > max_rtp_size ? max_rtp_size : remain_size;
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RtpCodec::inputRtp(makeRtp(getTrackType(), ptr, rtp_size, false, stamp), false);
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ptr += rtp_size;
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remain_size -= rtp_size;
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}
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}
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