RTSP推流增加L16动态payload type支持(RFC 3551 Section 4.5.11, RFC 2586)

src/Extension/Factory.cpp

@@ -20,6 +20,7 @@
 #include "CommonRtp.h"
 #include "Opus.h"
 #include "G711.h"
+#include "L16.h"
 #include "Common/Parser.h"
 
 namespace mediakit{
@@ -56,6 +57,10 @@ Track::Ptr Factory::getTrackBySdp(const SdpTrack::Ptr &track) {
         return std::make_shared<G711Track>(CodecG711U,  track->_samplerate, track->_channel, 16);
     }
 
+    if (strcasecmp(track->_codec.data(), "L16") == 0) {
+        return std::make_shared<L16Track>(track->_samplerate, track->_channel);
+    }
+
     if (strcasecmp(track->_codec.data(), "h264") == 0) {
         //a=fmtp:96 packetization-mode=1;profile-level-id=42C01F;sprop-parameter-sets=Z0LAH9oBQBboQAAAAwBAAAAPI8YMqA==,aM48gA==
         auto map = Parser::parseArgs(FindField(track->_fmtp.data()," ", nullptr),";","=");
@@ -123,6 +128,7 @@ RtpCodec::Ptr Factory::getRtpEncoderBySdp(const Sdp::Ptr &sdp) {
         case CodecH264 : return std::make_shared<H264RtpEncoder>(ssrc, mtu, sample_rate, pt, interleaved);
         case CodecH265 : return std::make_shared<H265RtpEncoder>(ssrc, mtu, sample_rate, pt, interleaved);
         case CodecAAC : return std::make_shared<AACRtpEncoder>(ssrc, mtu, sample_rate, pt, interleaved);
+        case CodecL16 :
         case CodecOpus :
         case CodecG711A :
         case CodecG711U : return std::make_shared<CommonRtpEncoder>(codec_id, ssrc, mtu, sample_rate, pt, interleaved);
@@ -135,6 +141,7 @@ RtpCodec::Ptr Factory::getRtpDecoderByTrack(const Track::Ptr &track) {
         case CodecH264 : return std::make_shared<H264RtpDecoder>();
         case CodecH265 : return std::make_shared<H265RtpDecoder>();
         case CodecAAC : return std::make_shared<AACRtpDecoder>(track->clone());
+        case CodecL16 :
         case CodecOpus :
         case CodecG711A :
         case CodecG711U : return std::make_shared<CommonRtpDecoder>(track->getCodecId());

src/Extension/Frame.h

@@ -28,6 +28,7 @@ typedef enum {
     CodecAAC,
     CodecG711A,
     CodecG711U,
+    CodecL16,
     CodecOpus,
     CodecMax = 0x7FFF
 } CodecId;

src/Extension/L16.cpp

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
+ *
+ * This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit).
+ *
+ * Use of this source code is governed by MIT license that can be found in the
+ * LICENSE file in the root of the source tree. All contributing project authors
+ * may be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "L16.h"
+
+namespace mediakit{
+
+Sdp::Ptr L16Track::getSdp() {
+    WarnL << "Enter  L16Track::getSdp function";
+    if(!ready()){
+        WarnL << getCodecName() << " Track未准备好";
+        return nullptr;
+    }
+    return std::make_shared<L16Sdp>(getCodecId(), getAudioSampleRate(), getAudioChannel(), getBitRate() / 1024);
+}
+
+}//namespace mediakit
+
+

src/Extension/L16.h

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
+ *
+ * This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit).
+ *
+ * Use of this source code is governed by MIT license that can be found in the
+ * LICENSE file in the root of the source tree. All contributing project authors
+ * may be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef ZLMEDIAKIT_L16_H
+#define ZLMEDIAKIT_L16_H
+
+#include "Frame.h"
+#include "Track.h"
+
+namespace mediakit{
+
+/**
+ * L16音频通道
+ */
+class L16Track : public AudioTrackImp{
+public:
+    typedef std::shared_ptr<L16Track> Ptr;
+    L16Track(int sample_rate, int channels) : AudioTrackImp(CodecL16,sample_rate,channels,16){}
+
+private:
+    //克隆该Track
+    Track::Ptr clone() override {
+        return std::make_shared<std::remove_reference<decltype(*this)>::type >(*this);
+    }
+    //生成sdp
+    Sdp::Ptr getSdp() override ;
+};
+
+/**
+ * L16类型SDP
+ */
+class L16Sdp : public Sdp {
+public:
+    /**
+     * L16采样位数固定为16位
+     * @param codecId CodecL16
+     * @param sample_rate 音频采样率
+     * @param payload_type rtp payload
+     * @param bitrate 比特率
+     */
+    L16Sdp(CodecId codecId,
+            int sample_rate,
+            int channels,
+            int bitrate = 128,
+            int payload_type = 98) : Sdp(sample_rate,payload_type), _codecId(codecId){
+        _printer << "m=audio 0 RTP/AVP " << payload_type << "\r\n";
+        if (bitrate) {
+            _printer << "b=AS:" << bitrate << "\r\n";
+        }
+        _printer << "a=rtpmap:" << payload_type << " L16/" << sample_rate  << "/" << channels << "\r\n";
+        _printer << "a=control:trackID=" << (int)TrackAudio << "\r\n";
+    }
+
+    string getSdp() const override {
+        return _printer;
+    }
+
+    CodecId getCodecId() const override {
+        return _codecId;
+    }
+private:
+    _StrPrinter _printer;
+    CodecId _codecId;
+};
+
+}//namespace mediakit
+#endif //ZLMEDIAKIT_L16_H