dfattal.github.io/lifParser.html at main · dfattal/dfattal.github.io · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>LIF5 LDL 5.2 JS Parser example</title>
    <style>
        img {
            border: 1px solid black;
        }
    </style>
</head>
<body>
    <h1>LIF5 LDL 5.2 JS Parser example</h1>
    <input type="file" id="filePicker" /> <br>
    <script>

// Jul 25, 2024, 19:39, supports 5.1 and 5.2 LIF LDL (LDI) files

class BinaryStream {
    constructor(arrayBuffer) {
        this.dataView = new DataView(arrayBuffer);
        this.offset = 0;
    }
    readBytes(length) {
        const bytes = new Uint8Array(this.dataView.buffer, this.offset, length);
        this.offset += length;
        return bytes;
    }
    readUInt16() {
        const value = this.dataView.getUint16(this.offset, false); // Big-endian
        this.offset += 2;
        return value;
    }
    readUInt32() {
        const value = this.dataView.getUint32(this.offset, false); // Big-endian
        this.offset += 4;
        return value;
    }
}

class Field {
    constructor(fieldType = -1, data = new Uint8Array()) {
        this.fieldType = fieldType;
        this.fieldDataSize = data.byteLength;
        this.fieldData = data;
    }
    toBlob() {
        return new Blob([this.fieldData]);
    }
    toObjectUrl() {
        return URL.createObjectURL(this.toBlob());
    }
    toString() {
      return new TextDecoder().decode(this.fieldData);
    }
}


class Metadata {
    constructor() {
        this.fields = [];
        this.fullSize = 0;
        this.regionOffset = 0;
    }
    addField(field) {
        this.fields.push(field);
    }
    getFieldByType(fieldType) {
        return this.fields.find(field => field.fieldType === fieldType);
    }
    getJsonMeta() {
        const JSON_META = 7;
        const JSON_META_NEW = 8;
        const metaField = this.getFieldByType(JSON_META_NEW) || this.getFieldByType(JSON_META);
        if (!metaField) {
            throw new Error('Failed to extract LIF meta');
        }
        return JSON.parse(metaField.toString());
    }
}


class LifFileParser {
    constructor() {
        this.fileInput = document.getElementById('filePicker');
        this.fileInput.addEventListener('change', this.handleFileSelect.bind(this));
    }

    async handleFileSelect(event) {
        const file = event.target.files[0];
        if (file) {
            console.log(file);
            const arrayBuffer = await file.arrayBuffer();
            this.parseLif5(arrayBuffer);
        }
    }

    async parseBinary(arrayBuffer) {
        const fullSize = arrayBuffer.byteLength;
        const bf = new BinaryStream(arrayBuffer);
        bf.offset = fullSize - 2;
        const endMarker = bf.readUInt16();
        if (endMarker !== 0x1e1a) {
          throw new Error('Not a LIF file');
        }
        bf.offset = fullSize - 6;
        const regionOffset = bf.readUInt32();
        bf.offset = fullSize - regionOffset;

        const metadata = new Metadata();
        metadata.fieldCount = bf.readUInt32();
        console.log(metadata.fieldCount);
        for (let i = 0; i < metadata.fieldCount; i++) {
          const fieldType = bf.readUInt32();
          const fieldDataSize = bf.readUInt32();
          const fieldData = bf.readBytes(fieldDataSize);
          const field = new Field(fieldType, fieldData);
          metadata.addField(field);
        }
        metadata.regionOffset = regionOffset;
        metadata.fullSize = fullSize;
        console.log(metadata);
        return metadata;
    }

    async debugAddBlobAsImageToPage(blob) {
        const blobUrl = URL.createObjectURL(blob);
        const img = document.createElement('img');
        img.src = blobUrl;
        img.style.width = '300px';
        img.style.height = 'auto';
        document.body.appendChild(img);
        img.onload = () => {
            URL.revokeObjectURL(blobUrl);
        };
    }

    async parseLif5(arrayBuffer) {
        const lifMeta = await this.parseBinary(arrayBuffer);
        const lifJson = lifMeta.getJsonMeta();
        console.log(lifJson);
        const layers = [];
        for (const view of lifJson.views) {
            if (view.albedo) {
                if (view.albedo.blob_id == -1 /*source image*/) {
                    const albedo = new Blob([arrayBuffer], { type: 'image/jpeg' });
                    this.debugAddBlobAsImageToPage(albedo);
                } else {
                  const albedo = lifMeta.getFieldByType(view.albedo.blob_id).toBlob();
                  this.debugAddBlobAsImageToPage(albedo);
                }
            }
            if (view.disparity) {
              const disparity = lifMeta.getFieldByType(view.disparity.blob_id).toBlob();
              this.debugAddBlobAsImageToPage(disparity);
              document.body.append(document.createElement('br'));
              document.body.append(view.disparity.min_disparity);
              document.body.append(document.createElement('br'));
              document.body.append(view.disparity.max_disparity);
              document.body.append(document.createElement('br'));
            }
            let layers = view.layers_top_to_bottom;
            if (!layers) layers = view.layered_depth_image_data.layers_top_to_bottom;
            for (const layer of layers) {
              const rgb = lifMeta.getFieldByType(layer.albedo.blob_id).toBlob();
              const disp = lifMeta.getFieldByType(layer.disparity.blob_id).toBlob();
              const mask = lifMeta.getFieldByType(layer.mask.blob_id).toBlob();
              this.debugAddBlobAsImageToPage(rgb);
              this.debugAddBlobAsImageToPage(disp);
              this.debugAddBlobAsImageToPage(mask);
              console.log(layer);
              document.body.append(document.createElement('br'));
              document.body.append(layer.disparity.min_disparity);
              document.body.append(document.createElement('br'));
              document.body.append(layer.disparity.max_disparity);
              document.body.append(document.createElement('br'));
              // access other layer propeties here if needed
            }
        }
    }
}

document.addEventListener('DOMContentLoaded', () => {
    new LifFileParser();
});
    </script>
</body>
</html>