背景
买了个JBL的音响，希望能用来实现一些有趣的功能。
UPnP协议
具体细节可以参考这个博客,讲的比较详细。
动手实践
发现设备
使用nanodlna来发现设备，输出结果如下：
[urn:schemas-upnp-org:device:MediaRenderer:1][urn:schemas-upnp-org:service:AVTransport:1] JBL Authentics 500_26B0 @ http://192.168.50.90:49152/description.xml
请求设备描述文档
curl http://192.168.50.90:49152/description.xml
其中返回结果的控制部分如下
<service>
<serviceType>urn:schemas-upnp-org:service:AVTransport:1</serviceType>
<serviceId>urn:upnp-org:serviceId:AVTransport</serviceId>
<SCPDURL>/upnp/rendertransportSCPD.xml</SCPDURL>
<controlURL>/upnp/control/rendertransport1</controlURL>
<eventSubURL>/upnp/event/rendertransport1</eventSubURL>
</service>
请求服务描述文档
curl http://192.168.50.90:49152/upnp/rendertransportSCPD.xml
截取其中最重要的两个部分，分别为设置uri和play接口
设置uri
<action>
<name>SetAVTransportURI</name>
<argumentList>
<argument>
<name>InstanceID</name>
<direction>in</direction>
<relatedStateVariable>A_ARG_TYPE_InstanceID</relatedStateVariable>
</argument>
<argument>
<name>CurrentURI</name>
<direction>in</direction>
<relatedStateVariable>AVTransportURI</relatedStateVariable>
</argument>
<argument>
<name>CurrentURIMetaData</name>
<direction>in</direction>
<relatedStateVariable>AVTransportURIMetaData</relatedStateVariable>
</argument>
</argumentList>
</action>
这里argument代表参数，我这里有三个参数(别的设备可能不一样)
play接口
<action>
<name>Play</name>
<argumentList>
<argument>
<name>InstanceID</name>
<direction>in</direction>
<relatedStateVariable>A_ARG_TYPE_InstanceID</relatedStateVariable>
</argument>
<argument>
<name>Speed</name>
<direction>in</direction>
<relatedStateVariable>TransportPlaySpeed</relatedStateVariable>
</argument>
</argumentList>
</action>
使用curl发送DLNA请求
- 设置URI，这里我的URI是
http://192.168.50.33/mnt/FLAC/06.Farewell%2C%20My%20Friend.flac
curl -H 'Content-Type: text/xml; charset=utf-8' \
-H 'SOAPAction: "urn:schemas-upnp-org:service:AVTransport:1#SetAVTransportURI"' \
-d '<?xml version="1.0"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"
s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>
<u:SetAVTransportURI xmlns:u="urn:schemas-upnp-org:service:AVTransport:1">
<InstanceID>0</InstanceID>
<CurrentURI>http://192.168.50.33/mnt/FLAC/06.Farewell%2C%20My%20Friend.flac</CurrentURI>
<CurrentURIMetaData></CurrentURIMetaData>
</u:SetAVTransportURI>
</s:Body>
</s:Envelope>' \
'http://192.168.50.90:49152/upnp/control/rendertransport1'
- 播放
curl -H 'Content-Type: text/xml; charset=utf-8' \
-H 'SOAPAction: "urn:schemas-upnp-org:service:AVTransport:1#Play"' \
-d '<?xml version="1.0"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"
s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>
<u:Play xmlns:u="urn:schemas-upnp-org:service:AVTransport:1">
<InstanceID>0</InstanceID>
<Speed>1</Speed>
</u:Play>
</s:Body>
</s:Envelope>' \
'http://192.168.50.90:49152/upnp/control/rendertransport1'
- 暂停
curl -H 'Content-Type: text/xml; charset=utf-8' \
-H 'SOAPAction: "urn:schemas-upnp-org:service:AVTransport:1#Pause"' \
-d '<?xml version="1.0"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"
s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>
<u:Pause xmlns:u="urn:schemas-upnp-org:service:AVTransport:1">
<InstanceID>0</InstanceID>
</u:Pause>
</s:Body>
</s:Envelope>' \
'http://192.168.50.90:49152/upnp/control/rendertransport1'
- 结束播放
curl -H 'Content-Type: text/xml; charset=utf-8' \
-H 'SOAPAction: "urn:schemas-upnp-org:service:AVTransport:1#Stop"' \
-d '<?xml version="1.0"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"
s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>
<u:Stop xmlns:u="urn:schemas-upnp-org:service:AVTransport:1">
<InstanceID>0</InstanceID>
</u:Stop>
</s:Body>
</s:Envelope>' \
'http://192.168.50.90:49152/upnp/control/rendertransport1'
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