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    TCPlayer Swift Live Streaming Downgrade Notice

    最終更新日:2024-05-13 17:49:25
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      Downgrade Scenarios

      Live Event Broadcasting (LEB) relies on WebRTC technology, requiring both the operating system and browser to support WebRTC.
      Currently, the SDK has been tested on the following operating systems and browsers, with the test results as follows.
      Operating System
      OS Version
      Browser
      Browser Version
      Support for Stream Pull
      Windows
      Windows 10
      Chrome
      86+
      ✓
      Firefox
      88+
      ✓
      Microsoft Edge
      86+
      ✓
      macOS
      10.5+
      Safari
      13.1+
      ✓
      Chrome
      86+
      ✓
      Firefox
      88+
      ✓
      Microsoft Edge
      86+
      ✓
      iOS
      13.1.1+
      Safari
      13.7+
      ✓
      Chrome
      86+
      ✓
      Firefox
      33+
      ✓
      Microsoft Edge
      89
      ✓
      WeChat embedded
      -
      ✓
      Android
      -
      Chrome
      86+
      ✓
      Firefox
      88+
      ✓
      WeChat embedded
      X5 kernel
      ✓
      WeChat embedded
      XWeb kernel
      ✓
      Additionally, in some browsers that support WebRTC, there may be decoding failures or server-side issues. In these cases, the player will convert the WebRTC URL to a more compatible HLS URL for playback. This behavior is known as downgrade processing.
      To summarize, there are several scenarios that trigger downgrading:
      The browser environment does not support WebRTC.
      Failed to connect to the server, and the number of retries has exceeded the preset value (internal status code -2004).
      Failed to decode during playback (internal status code -2005).
      Other WebRTC-related errors (internal status code -2001).

      Downgrade Methods

      1. Automatic Downgrade

      During player initialization, the LEB URL is received through the sources field. In environments requiring downgrade processing, the player automatically converts the LEB URL to the HLS URL.
      For example, the LEB URL
      webrtc://global-lebtest-play.myqcloud.com/live/lebtest?txSecret=f22a813b284137ed10d3259a7b5c224b&txTime=69f1eb8c
      will automatically convert to:
      https://global-lebtest-play.myqcloud.com/live/lebtest.m3u8?txSecret=f22a813b284137ed10d3259a7b5c224b&txTime=69f1eb8c

      2. Specified Downgrade

      In ABR playback scenarios, downgrade processing requires manually specifying an HLS URL. Direct format conversion is not supported. This method can also be used for scenarios where users require manual configuration of downgrade URLs, and it is compatible with protocols beyond HLS.
      var player = TCPlayer('player-container-id',{
          sources: 'webrtc://global-lebtest-play.myqcloud.com/live/lebtest?txSecret=f22a813b284137ed10d3259a7b5c224b&txTime=69f1eb8c&tabr_bitrates=d1080p,d540p,d360p&tabr_start_bitrate=d1080p',
          webrtcConfig: {
            fallbackUrl: 'https://global-lebtest-play.myqcloud.com/live/lebtest_HLSABR.m3u8',
          },
      });

      Downgrade Callback

      When a downgrade is triggered, the player will initiate a callback.
      player.on('webrtcfallback', function(event) {
          console.log(event);
      });
      
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