web-amr/dist/detect.js

AMR Player for the web

const AMR_WB_HEADER = "#!AMR-WB\n";
const AMR_NB_HEADER = "#!AMR\n";
export const detect = async (file) => {
    const slice = file.slice(0, AMR_WB_HEADER.length);
    const magic = new TextDecoder().decode(slice instanceof Blob ? await slice.arrayBuffer() : slice);
    if (magic === AMR_WB_HEADER)
        return "amrwb";
    if (magic.startsWith(AMR_NB_HEADER))
        return "amrnb";
    return false;
};