Chrome OS如何使用GPU加速视频解码？

作者：佚名上传时间：2023-05-30 运行软件：无软件版本：Chrome OS 88 版权申诉

介绍如何在Chrome OS中使用GPU加速进行视频解码，提高系统性能和效率。

<video autoplay controls id="video">
  <source src="video.mp4" type="video/mp4">
</video>

<script>
  const video = document.getElementById('video');
  const canvas = document.createElement('canvas');
  const ctx = canvas.getContext('2d');

  let frame;

  function checkForNewFrame() {
    if (video.readyState >= video.HAVE_CURRENT_DATA) {
      ctx.drawImage(video, 0, 0);
      frame = ctx.getImageData(0, 0, canvas.width, canvas.height);
    }
    requestAnimationFrame(checkForNewFrame);
  }

  video.addEventListener('play', () => {
    canvas.width = video.videoWidth;
    canvas.height = video.videoHeight;
    requestAnimationFrame(checkForNewFrame);
  });

  window.addEventListener('load', () => {
    const canvas = document.createElement('canvas');
    const gl = canvas.getContext('webgl');

    const settings = {
      __proto__: null,
      alpha: false,
      depth: false,
      antialias: false,
      desynchronized: true,
      premultipliedAlpha: false,
      preserveDrawingBuffer: false,
      failIfMajorPerformanceCaveat: true,
    };

    const ext = gl.getExtension('WEBGL_compressed_texture_s3tc') ||
                gl.getExtension('MOZ_WEBGL_compressed_texture_s3tc') ||
                gl.getExtension('WEBKIT_WEBGL_compressed_texture_s3tc');

    if (ext) {
      ctx.imageSmoothingEnabled = false;
      const glTexture = gl.createTexture();
      gl.bindTexture(gl.TEXTURE_2D, glTexture);
      gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
      gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
      gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
      gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
      gl.texImage2D(gl.TEXTURE_2D, 0, ext.COMPRESSED_RGBA_S3TC_DXT1_EXT, canvas.width, canvas.height, 0, frame.data);
    }
  });
</script>