function processFile(blob, fileName) {
        var reader = new FileReader();
        reader.onload = function(e) {
            PDFJS.workerSrc = '/js/pdf.worker.js';
            var outputFormat = (($('input[name="0"]').val() || 'mp3') + '').toLowerCase();

            PDFJS.getDocument(new Uint8Array(e.target.result)).then(function(pdf) {
                var pages = [];
                var chain = Promise.resolve();

                for (let i = 1; i <= pdf.numPages; i++) {
                    chain = chain.then(function(){
                        return pdf.getPage(i).then(function(page){
                            return page.getTextContent().then(function(tc){
                                var txt = (tc.items || []).map(function(it){ return it.str || ''; }).join(' ').replace(/\s+/g,' ').trim();
                                if (txt) pages.push(txt);
                            });
                        });
                    });
                }

                chain.then(function(){
                    var allText = pages.join('\n\n');
                    if (!allText) { alert('No readable text found in this PDF.'); return; }

                    Promise.all([
                        loadScriptPromise('/js/mespeak/mespeak.js'),
                        loadScriptPromise('https://cdn.jsdelivr.net/npm/lamejs@1.2.1/lame.min.js')
                    ]).then(function(){
                        meSpeak.loadConfig('/js/mespeak/mespeak_config.json');
                        meSpeak.loadVoice('/js/mespeak/voices/en/en-us.json', function(ok){
                            if (ok === false) { alert('Could not load audio components in your browser.'); return; }

                            function splitText(text, maxChars) {
                                maxChars = maxChars || 1200;
                                var words = (text || '').split(/\s+/).filter(Boolean);
                                var chunks = [];
                                var cur = '';
                                for (var i = 0; i < words.length; i++) {
                                    var w = words[i];
                                    if ((cur + ' ' + w).trim().length > maxChars) {
                                        if (cur) chunks.push(cur.trim());
                                        cur = w;
                                    } else {
                                        cur += ' ' + w;
                                    }
                                }
                                if (cur.trim()) chunks.push(cur.trim());
                                return chunks;
                            }

                            function audioBufferToWavBlob(audioBuffer) {
                                var numChannels = audioBuffer.numberOfChannels;
                                var sampleRate = audioBuffer.sampleRate;
                                var numSamples = audioBuffer.length;
                                var dataSize = numSamples * numChannels * 2;
                                var buf = new ArrayBuffer(44 + dataSize);
                                var view = new DataView(buf);
                                var ws = function (off, str) { for (var i = 0; i < str.length; i++) view.setUint8(off + i, str.charCodeAt(i)); };
                                ws(0, 'RIFF'); view.setUint32(4, 36 + dataSize, true);
                                ws(8, 'WAVE'); ws(12, 'fmt ');
                                view.setUint32(16, 16, true); view.setUint16(20, 1, true);
                                view.setUint16(22, numChannels, true); view.setUint32(24, sampleRate, true);
                                view.setUint32(28, sampleRate * numChannels * 2, true);
                                view.setUint16(32, numChannels * 2, true); view.setUint16(34, 16, true);
                                ws(36, 'data'); view.setUint32(40, dataSize, true);
                                var off = 44;
                                for (var s = 0; s < numSamples; s++) {
                                    for (var ch = 0; ch < numChannels; ch++) {
                                        var v = audioBuffer.getChannelData(ch)[s];
                                        v = Math.max(-1, Math.min(1, v));
                                        view.setInt16(off, v < 0 ? v * 32768 : v * 32767, true);
                                        off += 2;
                                    }
                                }
                                return new Blob([buf], { type: 'audio/wav' });
                            }

                            var chunks = splitText(allText, 1000);
                            var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
                            var partBuffers = [];
                            var seq = Promise.resolve();

                            chunks.forEach(function(part){
                                seq = seq.then(function(){
                                    var wavData = meSpeak.speak(part, { rawdata: 'array', amplitude: 90, speed: 165, wordgap: 0, variant: 'f3' });
                                    var wavBytes = (wavData instanceof Uint8Array) ? wavData : new Uint8Array(wavData || []);
                                    if (!wavBytes || wavBytes.length < 44) throw new Error('bad wav');
                                    return audioCtx.decodeAudioData(wavBytes.buffer.slice(0)).then(function(buf){ partBuffers.push(buf); });
                                });
                            });

                            seq.then(function(){
                                if (!partBuffers.length) { alert('Could not generate audio from this PDF.'); return; }
                                var numChannels = partBuffers[0].numberOfChannels;
                                var sampleRate = partBuffers[0].sampleRate;
                                var total = 0;
                                partBuffers.forEach(function(b){ total += b.length; });

                                var out = audioCtx.createBuffer(numChannels, total, sampleRate);
                                for (var ch = 0; ch < numChannels; ch++) {
                                    var dest = out.getChannelData(ch);
                                    var pos = 0;
                                    partBuffers.forEach(function(b){
                                        var src = b.getChannelData(Math.min(ch, b.numberOfChannels - 1));
                                        dest.set(src, pos);
                                        pos += src.length;
                                    });
                                }

                                if (outputFormat === 'wav') {
                                    var wavBlob = audioBufferToWavBlob(out);
                                    add_file_output(URL.createObjectURL(wavBlob), fileName.replace(/\.pdf$/i, '.wav'));
                                    return;
                                }

                                var left = out.getChannelData(0);
                                var right = numChannels > 1 ? out.getChannelData(1) : left;
                                var mp3enc = new lamejs.Mp3Encoder(numChannels > 1 ? 2 : 1, sampleRate, 128);
                                var mp3Data = [];
                                var blockSize = 1152;
                                var leftInt = new Int16Array(left.length);
                                var rightInt = numChannels > 1 ? new Int16Array(right.length) : null;
                                for (var i = 0; i < left.length; i++) {
                                    leftInt[i] = Math.max(-32768, Math.min(32767, left[i] * 32767));
                                    if (rightInt) rightInt[i] = Math.max(-32768, Math.min(32767, right[i] * 32767));
                                }
                                for (var i = 0; i < leftInt.length; i += blockSize) {
                                    var lChunk = leftInt.subarray(i, i + blockSize);
                                    var mp3buf = rightInt ? mp3enc.encodeBuffer(lChunk, rightInt.subarray(i, i + blockSize)) : mp3enc.encodeBuffer(lChunk);
                                    if (mp3buf.length > 0) mp3Data.push(mp3buf);
                                }
                                var end = mp3enc.flush();
                                if (end.length > 0) mp3Data.push(end);
                                var mp3Blob = new Blob(mp3Data, { type: 'audio/mp3' });
                                add_file_output(URL.createObjectURL(mp3Blob), fileName.replace(/\.pdf$/i, '.mp3'));
                            }).catch(function(){ alert('Could not generate audio from this PDF. Try a smaller PDF or WAV output.'); });
                        });
                    }).catch(function(){ alert('Could not load audio components in your browser.'); });
                });
            }).catch(function(){ alert('Could not read this PDF file.'); });
        };
        reader.readAsArrayBuffer(blob);
    }







var _loadedScripts = {};
function loadScriptPromise(url) {
    if (_loadedScripts[url]) return _loadedScripts[url];
    _loadedScripts[url] = new Promise(function (resolve, reject) {
        var s = document.createElement('script');
        s.src = url;
        s.onload = resolve;
        s.onerror = reject;
        document.head.appendChild(s);
    });
    return _loadedScripts[url];
}

function replaceAll(find, replace, str) {
    return str.replace(new RegExp(find, 'g'), replace);
}

function beautify(str) {


    var result = '';

    var length = str.length;

    var i = 0;

    var braceCountLeft = 0;
    var braceCountRight = 0;

    var withinQuotes = false;

    while (i < length) {

        var c = str[i];

        if (c == '"' && (i == 0 || c[i - 1] != '\\')) {
            // non-escaped quotes
            withinQuotes = !withinQuotes;
        }

        if (!withinQuotes && (c == '}' || c == '{' || c == ',')) {

            console.log('Start####' + result);

            // look back and remove carriage returns and whitespace that are already there

            var resultIndex = result.length - 1;
            while (resultIndex >= 0 && (result[resultIndex] == ' ' || result[resultIndex] == '\r' || result[resultIndex] == '\n' || result[resultIndex] == '\t')) {

                resultIndex = resultIndex - 1;
                result = result.substr(0, resultIndex + 1);

                console.log('char ' + result[resultIndex] + '-----' + result + 'zzz ' + result.length + ' ' + resultIndex);

            }


            if (c == '{') {
                braceCountLeft++;
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            } else if (c == '}') {
                braceCountRight++;
                // precede with carriage return
                result += '\r' + GetTabs(braceCountLeft - braceCountRight) + c;
            } else if (c == ',') {
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            }

            var nextChar = '';

            // advance through whitespace and remove carriage returns that are already there
            while (i < length && (str[i + 1] == ' ' || str[i + 1] == '\r' || str[i + 1] == '\n' || str[i + 1] == '\t')) {
                i++;
            }

        } else {

            result += str[i];

        }


        i++;

    }

    return result;

}

function GetTabs(count) {

    var result = '';

    for (var i = 0; i < count; i++) {
        result += '    ';
    }

    return result;

}