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pdwilso · Jun 19, 2023 · eb621ad · eb621ad
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diff --git a/webaudio-examples-main/stream-source-buffer/index.html b/webaudio-examples-main/stream-source-buffer/index.html
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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width" />
+    <title>Web Audio API examples: MediaStreamAudioSourceNode</title>
+  </head>
+
+  <body>
+    <h1>Web Audio API examples: MediaStreamAudioSourceNode</h1>
+    <video controls></video>
+    <br />
+    <label for="gain">Volume: </label>
+    <input id="gain" type="range" min="1" max="40" />
+
+    <p>Biquad filter frequency response for:</p>
+    <ul class="freq-response"></ul>
+    <script>
+      // Store useful UI elements
+      const video = document.querySelector("video");
+      const range = document.querySelector("#gain");
+      const freqResponseOutput = document.querySelector(".freq-response");
+
+      // Create float32 arrays for getFrequencyResponse()
+      const frequencyArray = new Float32Array([1000, 2000, 3000, 4000, 5000]);
+      const magResponseOutput = new Float32Array(frequencyArray.length);
+      const phaseResponseOutput = new Float32Array(frequencyArray.length);
+
+      navigator.mediaDevices
+        .getUserMedia({ audio: true, video: true })
+        .then((stream) => {
+          video.srcObject = stream;
+          video.onloadedmetadata = (e) => {
+            video.play();
+            video.muted = true;
+          };
+
+          // Create a MediaStreamAudioSourceNode
+          // Feed the HTMLMediaElement into it
+          const audioCtx = new AudioContext();
+          const source = new MediaStreamAudioSourceNode(audioCtx, {
+            mediaStream: stream,
+          });
+
+          // Create a biquadfilter
+          const biquadFilter = new BiquadFilterNode(audioCtx, {
+            type: "lowshelf",
+            frequency: 1000,
+            gain: range.value,
+          });
+
+          // Chain the nodes so we can play the
+          // music and adjust the volume using the mouse cursor
+          source.connect(biquadFilter);
+          biquadFilter.connect(audioCtx.destination);
+
+          // Get new mouse pointer coordinates when mouse is moved
+          // then set new gain value
+          range.oninput = () => {
+            biquadFilter.gain.value = range.value;
+          };
+
+          // Read frequency response:
+
+          // Get magnitude and phase associated with a frequency
+          biquadFilter.getFrequencyResponse(
+            frequencyArray,
+            magResponseOutput,
+            phaseResponseOutput
+          );
+
+          // Populate list
+          for (let i = 0; i < frequencyArray.length; i++) {
+            const listItem = document.createElement("li");
+            listItem.textContent = `${frequencyArray[i]}Hz: Magnitude ${magResponseOutput[i]}, Phase ${phaseResponseOutput[i]}rad.`;
+            freqResponseOutput.appendChild(listItem);
+          }
+        })
+        .catch((err) => {
+          console.error(`The following error occurred: ${err}`);
+        });
+    </script>
+  </body>
+</html>