73 lines
2.0 KiB
C++
73 lines
2.0 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 "G711.h"
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using namespace std;
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using namespace toolkit;
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namespace mediakit{
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/**
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* G711类型SDP
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*/
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class G711Sdp : public Sdp {
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public:
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/**
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* G711采样率固定为8000
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* @param codecId G711A G711U
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* @param payload_type rtp payload type
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* @param sample_rate 音频采样率
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* @param channels 通道数
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* @param bitrate 比特率
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*/
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G711Sdp(CodecId codecId, int payload_type, int sample_rate, int channels, int bitrate)
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: Sdp(sample_rate, payload_type) {
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_printer << "m=audio 0 RTP/AVP " << payload_type << "\r\n";
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if (bitrate) {
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_printer << "b=AS:" << bitrate << "\r\n";
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}
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_printer << "a=rtpmap:" << payload_type << " " << getCodecName(codecId) << "/" << sample_rate << "/" << channels << "\r\n";
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}
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string getSdp() const override {
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return _printer;
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}
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private:
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_StrPrinter _printer;
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};
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Track::Ptr G711Track::clone() const {
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return std::make_shared<G711Track>(*this);
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}
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Sdp::Ptr G711Track::getSdp(uint8_t payload_type) const {
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if (!ready()) {
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WarnL << getCodecName() << " Track未准备好";
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return nullptr;
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}
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const auto codec = getCodecId();
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const auto sample_rate = getAudioSampleRate();
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const auto audio_channel = getAudioChannel();
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const auto bitrate = getBitRate() >> 10;
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if (sample_rate == 8000 && audio_channel == 1) {
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// https://datatracker.ietf.org/doc/html/rfc3551#section-6
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payload_type = (codec == CodecG711U) ? Rtsp::PT_PCMU : Rtsp::PT_PCMA;
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}
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return std::make_shared<G711Sdp>(codec, payload_type, sample_rate, audio_channel, bitrate);
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}
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}//namespace mediakit
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