MediaKeys：getStatusForPolicy() 方法

getStatusForPolicy(policy)

<pre id="log"></pre>

#log {
  height: 100px;
  overflow: scroll;
  padding: 0.5rem;
  border: 1px solid black;
}

const logElement = document.querySelector("#log");
function log(text) {
  logElement.innerText = `${logElement.innerText}${text}\n`;
  logElement.scrollTop = logElement.scrollHeight;
}

const config = [
  {
    videoCapabilities: [
      {
        contentType: 'video/mp4; codecs="avc1.640028"',
        encryptionScheme: "cenc",
        robustness: "SW_SECURE_DECODE", // Widevine L3
      },
    ],
  },
];

getMediaStatus(config);

async function getMediaStatus(config) {
  try {
    const mediaKeySystemAccess = await navigator.requestMediaKeySystemAccess(
      "com.widevine.alpha",
      config,
    );
    const mediaKeys = await mediaKeySystemAccess.createMediaKeys();
    const mediaStatus = await mediaKeys.getStatusForPolicy({
      minHdcpVersion: "2.2",
    });
    log(mediaStatus);

    // Get the content or fallback to an alternative if the
    // keys are not usable
    if (mediaStatus === "usable") {
      console.log("HDCP 2.2 can be enforced.");
      // Fetch the high resolution protected content
    } else {
      log("HDCP 2.2 cannot be enforced");
      // Fallback other content, get license, etc.
    }
  } catch (error) {
    log(error);
  }
}