使用会话变量

如果ADS需要将名为的查询参数deviceSession与唯一会话标识符一起传递，则模板ADSURL在 AWS Elemental MediaTailor 可能如下所示：

https://my.ads.server.com/path?deviceSession=[session.id]

AWS Elemental MediaTailor 自动为每个直播生成一个唯一的标识符，然后输入该标识符来代替session.id。如果标识符是1234567，则向 MediaTailor 发出的最终请求ADS将如下所示：

https://my.ads.server.com/path?deviceSession=1234567

如果ADS需要传递多个查询参数，则模板ADSURL在 AWS Elemental MediaTailor 可能如下所示：

https://my.ads.server.com/sample?e=[scte.avails_expected]&f=[scte.segment_num]&g=[scte.segments_expected]&h=[scte.sub_segment_num]&j=[scte.sub_segments_expected]&k=[scte.segmentation_type_id]

以下DASH标记示例XML片段显示了如何使用scte35:SpliceInsert：

<Period start="PT444806.040S" id="123456" duration="PT15.000S">
  <EventStream timescale="90000" schemeIdUri="urn:scte:scte35:2013:xml">
    <Event duration="1350000">
      <scte35:SpliceInfoSection protocolVersion="0" ptsAdjustment="180832" tier="4095">
        <scte35:SpliceInsert spliceEventId="1234567890" spliceEventCancelIndicator="false" outOfNetworkIndicator="true" spliceImmediateFlag="false" uniqueProgramId="1" availNum="1" availsExpected="1">
          <scte35:Program><scte35:SpliceTime ptsTime="5672624400"/></scte35:Program>
          <scte35:BreakDuration autoReturn="true" duration="1350000"/>
        </scte35:SpliceInsert>
      </scte35:SpliceInfoSection>

以下DASH标记示例XML片段显示了如何使用scte35:TimeSignal：

<Period start="PT346530.250S" id="123456" duration="PT61.561S">
  <EventStream timescale="90000" schemeIdUri="urn:scte:scte35:2013:xml">
    <Event duration="5310000">
      <scte35:SpliceInfoSection protocolVersion="0" ptsAdjustment="183003" tier="4095">
        <scte35:TimeSignal>
          <scte35:SpliceTime ptsTime="3442857000"/>
        </scte35:TimeSignal>
        <scte35:SegmentationDescriptor segmentationEventId="1234567" segmentationEventCancelIndicator="false" segmentationDuration="8100000" segmentationTypeId="52" segmentNum="0" segmentsExpected="0">
          <scte35:DeliveryRestrictions webDeliveryAllowedFlag="false" noRegionalBlackoutFlag="false" archiveAllowedFlag="false" deviceRestrictions="3"/>
          <scte35:SegmentationUpid segmentationUpidType="12" segmentationUpidLength="2">0100</scte35:SegmentationUpid>
        </scte35:SegmentationDescriptor>
      </scte35:SpliceInfoSection>
    </Event>

以下DASH标记示例XML片段显示了如何使用scte35:Binary：

<Period start="PT444806.040S" id="123456" duration="PT15.000S">
  <EventStream schemeIdUri="urn:scte:scte35:2014:xml+bin" timescale="1">
    <Event presentationTime="1541436240" duration="24" id="29">
      <scte35:Signal xmlns="http://www.scte.org/schemas/35/2016">
        <scte35:Binary>/DAhAAAAAAAAAP/wEAUAAAHAf+9/fgAg9YDAAAAAAAA25aoh</Binary>
      </scte35:Signal>
    </Event>
    <Event presentationTime="1541436360" duration="24" id="30">
      <scte35:Signal xmlns="http://www.scte.org/schemas/35/2016">
        <scte35:Binary>QW5vdGhlciB0ZXN0IHN0cmluZyBmb3IgZW5jb2RpbmcgdG8gQmFzZTY0IGVuY29kZWQgYmluYXJ5Lg==</Binary>
      </scte35:Signal>
    </Event>

以下HLS标签示例显示了如何使用EXT-X-DATERANGE：

#EXT-X-DATERANGE:ID="splice-6FFFFFF0",START-DATE="2014-03-05T11:
15:00Z",PLANNED-DURATION=59.993,SCTE35-OUT=0xFC002F0000000000FF0
00014056FFFFFF000E011622DCAFF000052636200000000000A0008029896F50
000008700000000

以下HLS标签示例显示了如何使用EXT-X-CUE-OUT：

#EXT-OATCLS-SCTE35:/DA0AAAAAAAAAAAABQb+ADAQ6QAeAhxDVUVJQAAAO3/PAAEUrEoICAAAAAAg+2UBNAAANvrtoQ==  
#EXT-X-ASSET:CAID=0x0000000020FB6501  
#EXT-X-CUE-OUT:201.467

以下HLS标签示例显示了如何使用EXT-X-SPLICEPOINT-SCTE35：

#EXT-X-SPLICEPOINT-SCTE35:/DA9AAAAAAAAAP/wBQb+uYbZqwAnAiVDVUVJAAAKqX//AAEjW4AMEU1EU05CMDAxMTMyMjE5M19ONAAAmXz5JA==

以下示例显示了如何使用scte35:Binary解码：

{
  "table_id": 252,
  "section_syntax_indicator": false,
  "private_indicator": false,
  "section_length": 33,
  "protocol_version": 0,
  "encrypted_packet": false,
  "encryption_algorithm": 0,
  "pts_adjustment": 0,
  "cw_index": 0,
  "tier": "0xFFF",
  "splice_command_length": 16,
  "splice_command_type": 5,
  "splice_command": {
    "splice_event_id": 448,
    "splice_event_cancel_indicator": false,
    "out_of_network_indicator": true,
    "program_splice_flag": true,
    "duration_flag": true,
    "splice_immediate_flag": false,
    "utc_splice_time": {
      "time_specified_flag": false,
      "pts_time": null
    },
    "component_count": 0,
    "components": null,
    "break_duration": {
      "auto_return": false,
      "duration": {
        "pts_time": 2160000,
        "wall_clock_seconds": 24.0,
        "wall_clock_time": "00:00:24:00000"
      }
    },
    "unique_program_id": 49152,
    "avail_num": 0,
    "avails_expected": 0
    "segment_num": 0,
    "segments_expected": 0,
    "sub_segment_num": 0,
    "sub_segments_expected": 0
  },
  "splice_descriptor_loop_length": 0,
  "splice_descriptors": null,
  "Scte35Exception": {
    "parse_status": "SCTE-35 cue parsing completed with 0 errors.",
    "error_messages": [],
    "table_id": 252,
    "splice_command_type": 5
  }
}