base64-to-tensor
Version:
a pure js convert a base64 to a tensor object for node
114 lines • 5.69 kB
JavaScript
;
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Object.defineProperty(exports, "__esModule", { value: true });
exports.decodeImageAsync = exports.convertAsync = void 0;
var decode_1 = require("./decode");
var trim_base64_1 = require("./trim-base64");
/**
* This operation converts a base64 into a Tensor3D.
*
* @param base64 a valid base64 encoded string.
* @returns tf.Tensor3D
*/
var convertAsync = function (base64) { return __awaiter(void 0, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
if (!base64) {
return [2 /*return*/, null];
}
return [4 /*yield*/, (0, exports.decodeImageAsync)(Buffer.from((0, trim_base64_1.base64Replacer)(base64), "base64"))];
case 1: return [2 /*return*/, _a.sent()];
}
});
}); };
exports.convertAsync = convertAsync;
var sharp;
/**
* Decode a Uint8Array into Tensor3d
*
* @param contents a valid Uint8Array.
* @returns tf.Tensor3D
*/
var decodeImageAsync = function (contents) { return __awaiter(void 0, void 0, void 0, function () {
var _a, data, info, pixelArray;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
if (!!sharp) return [3 /*break*/, 2];
return [4 /*yield*/, Promise.resolve().then(function () { return __importStar(require("sharp")); })];
case 1:
sharp = (_b.sent()).default;
_b.label = 2;
case 2: return [4 /*yield*/, sharp(contents, { unlimited: true })
.toFormat("jpeg", { mozjpeg: true, quality: 100, chromaSubsampling: '4:4:4' })
.raw()
.unflatten()
.toBuffer({ resolveWithObject: true })];
case 3:
_a = _b.sent(), data = _a.data, info = _a.info;
pixelArray = new Uint8Array(data);
return [2 /*return*/, (0, decode_1.convertBuffer)(pixelArray, [info.height, info.width, 3])];
}
});
}); };
exports.decodeImageAsync = decodeImageAsync;
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