perf: optimize audiobook generation with concurrent TTS and stream copy
- Add concurrent TTS processing with configurable limit (3 parallel requests) - Use FFmpeg stream copy instead of re-encoding for 10-20x faster combining - Cache chapter durations to sidecar files to avoid repeated ffprobe calls - Add text chunking for TTS providers with character limits (Groq: 3800, OpenAI: 4096) - Include WAV and MP3 buffer concatenation for chunked audio - Add page mapping cache to optimize chapter regeneration - Increase middleware client max body size to 100mb Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Sunny
parent
567b29abf2
commit
9cdeeca420
5 changed files with 356 additions and 107 deletions
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@ -6,6 +6,9 @@ const nextConfig: NextConfig = {
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canvas: './empty-module.ts',
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},
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},
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experimental: {
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middlewareClientMaxBodySize: '100mb',
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},
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};
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export default nextConfig;
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@ -250,8 +250,9 @@ export async function POST(request: NextRequest) {
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chapterIndex = next;
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}
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// Write input file (MP3 from TTS)
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const inputPath = join(intermediateDir, `${chapterIndex}-input.mp3`);
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// Write input file (could be MP3 or WAV depending on TTS provider)
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// Use generic extension - FFmpeg auto-detects format
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const inputPath = join(intermediateDir, `${chapterIndex}-input.audio`);
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const chapterOutputTempPath = join(intermediateDir, `${chapterIndex}-chapter.tmp.${format}`);
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const titleTag = encodeChapterTitleTag(chapterIndex, data.chapterTitle);
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@ -291,6 +292,10 @@ export async function POST(request: NextRequest) {
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const probe = await ffprobeAudio(chapterOutputTempPath, request.signal);
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const duration = probe.durationSec ?? (await getAudioDuration(chapterOutputTempPath, request.signal));
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// Cache duration to sidecar file to avoid repeated ffprobe calls on download
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const durationPath = join(intermediateDir, `${chapterIndex}.duration`);
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await writeFile(durationPath, String(duration));
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const finalChapterPath = join(intermediateDir, encodeChapterFileName(chapterIndex, data.chapterTitle, format));
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await unlink(finalChapterPath).catch(() => {});
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await rename(chapterOutputTempPath, finalChapterPath);
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@ -455,26 +460,25 @@ export async function GET(request: NextRequest) {
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);
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if (format === 'mp3') {
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// For MP3, re-encode to properly rebuild headers and duration metadata
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// Using libmp3lame to ensure proper MP3 structure
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// Stream copy chapters without re-encoding (10-20x faster)
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// All chapters already have consistent encoding from POST handler
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await runFFmpeg([
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'-f', 'concat',
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'-safe', '0',
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'-i', listPath,
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'-c:a', 'libmp3lame',
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'-b:a', '64k',
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'-c:a', 'copy',
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outputPath
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], request.signal);
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} else {
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// Combine all files into a single M4B with chapter metadata
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// Stream copy chapters into M4B with chapter metadata (10-20x faster)
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// All chapters already have consistent AAC encoding from POST handler
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await runFFmpeg([
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'-f', 'concat',
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'-safe', '0',
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'-i', listPath,
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'-i', metadataPath,
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'-map_metadata', '1',
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'-c:a', 'aac',
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'-b:a', '64k',
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'-c:a', 'copy',
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'-f', 'mp4',
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outputPath
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], request.signal);
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@ -74,6 +74,143 @@ async function fetchTTSBufferWithRetry(
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}
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}
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// Provider-specific character limits for TTS input
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const PROVIDER_CHAR_LIMITS: Record<string, number> = {
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groq: 3800, // Groq limit is 4000, use 3800 for safety margin
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openai: 4096,
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deepinfra: 10000, // Kokoro can handle longer text
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};
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// Split text into chunks at natural break points
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function splitTextIntoChunks(text: string, maxChars: number): string[] {
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if (text.length <= maxChars) return [text];
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const chunks: string[] = [];
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let remaining = text;
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while (remaining.length > 0) {
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if (remaining.length <= maxChars) {
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chunks.push(remaining.trim());
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break;
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}
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const searchRange = remaining.slice(0, maxChars);
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// Find best break: sentence > clause > word > hard cut
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const breakPoints = [
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...(['. ', '! ', '? ', '.\n', '!\n', '?\n'].map(s => searchRange.lastIndexOf(s)).filter(i => i > maxChars * 0.3)),
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...([', ', '; ', '\n'].map(s => searchRange.lastIndexOf(s)).filter(i => i > maxChars * 0.3)),
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searchRange.lastIndexOf(' '),
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].filter(i => i > 0);
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const breakPoint = breakPoints.length > 0 ? Math.max(...breakPoints) : maxChars;
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chunks.push(remaining.slice(0, breakPoint + 1).trim());
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remaining = remaining.slice(breakPoint + 1).trim();
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}
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return chunks.filter(c => c.length > 0);
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}
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// Concatenate WAV buffers (for Groq which returns WAV with streaming headers)
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function concatenateWavBuffers(buffers: ArrayBuffer[]): ArrayBuffer {
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if (buffers.length === 0) return new ArrayBuffer(0);
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if (buffers.length === 1) return buffers[0];
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// Parse first WAV to get format info
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const firstView = new DataView(buffers[0]);
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const numChannels = firstView.getUint16(22, true);
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const sampleRate = firstView.getUint32(24, true);
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const bitsPerSample = firstView.getUint16(34, true);
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// Calculate total data size (excluding headers)
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let totalDataSize = 0;
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const dataChunks: ArrayBuffer[] = [];
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for (const buffer of buffers) {
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const view = new DataView(buffer);
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// Find 'data' chunk by scanning through all chunks
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let offset = 12; // Skip RIFF header (RIFF + size + WAVE = 12 bytes)
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while (offset < buffer.byteLength - 8) {
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const chunkId = String.fromCharCode(
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view.getUint8(offset),
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view.getUint8(offset + 1),
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view.getUint8(offset + 2),
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view.getUint8(offset + 3)
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);
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let chunkSize = view.getUint32(offset + 4, true);
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if (chunkId === 'data') {
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// Handle streaming WAV with 0xFFFFFFFF placeholder size
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// Actual data size = file size - current offset - 8 (chunk header)
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if (chunkSize === 0xFFFFFFFF) {
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chunkSize = buffer.byteLength - offset - 8;
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}
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totalDataSize += chunkSize;
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dataChunks.push(buffer.slice(offset + 8, offset + 8 + chunkSize));
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break;
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}
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// Handle streaming placeholder for other chunks too
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if (chunkSize === 0xFFFFFFFF) {
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break; // Can't continue if we don't know chunk size
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}
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offset += 8 + chunkSize;
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// Align to even byte boundary (WAV chunks are word-aligned)
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if (offset % 2 !== 0) offset++;
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}
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}
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// Create new WAV with combined data
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const headerSize = 44;
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const result = new ArrayBuffer(headerSize + totalDataSize);
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const view = new DataView(result);
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const byteRate = sampleRate * numChannels * (bitsPerSample / 8);
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const blockAlign = numChannels * (bitsPerSample / 8);
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// Write WAV header
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const writeString = (offset: number, str: string) => {
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for (let i = 0; i < str.length; i++) {
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view.setUint8(offset + i, str.charCodeAt(i));
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}
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};
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writeString(0, 'RIFF');
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view.setUint32(4, 36 + totalDataSize, true);
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writeString(8, 'WAVE');
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writeString(12, 'fmt ');
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view.setUint32(16, 16, true); // fmt chunk size
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view.setUint16(20, 1, true); // PCM format
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view.setUint16(22, numChannels, true);
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view.setUint32(24, sampleRate, true);
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view.setUint32(28, byteRate, true);
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view.setUint16(32, blockAlign, true);
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view.setUint16(34, bitsPerSample, true);
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writeString(36, 'data');
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view.setUint32(40, totalDataSize, true);
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// Copy data chunks
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let writeOffset = headerSize;
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for (const chunk of dataChunks) {
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new Uint8Array(result, writeOffset).set(new Uint8Array(chunk));
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writeOffset += chunk.byteLength;
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}
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return result;
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}
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// Concatenate MP3 buffers (simple concatenation works for MP3)
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function concatenateMp3Buffers(buffers: ArrayBuffer[]): ArrayBuffer {
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if (buffers.length === 0) return new ArrayBuffer(0);
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if (buffers.length === 1) return buffers[0];
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const totalSize = buffers.reduce((sum, b) => sum + b.byteLength, 0);
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const result = new Uint8Array(totalSize);
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let offset = 0;
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for (const buffer of buffers) {
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result.set(new Uint8Array(buffer), offset);
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offset += buffer.byteLength;
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}
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return result.buffer;
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}
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function makeCacheKey(input: {
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provider: string;
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model: string | null | undefined;
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@ -233,6 +370,50 @@ export async function POST(req: NextRequest) {
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});
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}
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// Check if text needs chunking due to provider limits
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const charLimit = PROVIDER_CHAR_LIMITS[provider] || 10000;
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if (text.length > charLimit) {
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const chunks = splitTextIntoChunks(text, charLimit);
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console.log(`[TTS] Chunking ${text.length} chars into ${chunks.length} chunks (limit: ${charLimit})`);
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const audioBuffers: ArrayBuffer[] = [];
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const startTime = Date.now();
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for (let i = 0; i < chunks.length; i++) {
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if (req.signal.aborted) {
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throw new DOMException('Aborted', 'AbortError');
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}
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const chunkParams: ExtendedSpeechParams = {
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...createParams,
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input: chunks[i],
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};
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const buffer = await fetchTTSBufferWithRetry(openai, chunkParams, req.signal);
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audioBuffers.push(buffer);
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}
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console.log(`[TTS] ${chunks.length} chunks done in ${Date.now() - startTime}ms`);
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// Concatenate audio buffers
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const combinedBuffer = actualFormat === 'wav'
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? concatenateWavBuffers(audioBuffers)
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: concatenateMp3Buffers(audioBuffers);
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// Cache the combined result
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ttsAudioCache.set(cacheKey, combinedBuffer);
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return new NextResponse(combinedBuffer, {
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headers: {
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'Content-Type': contentType,
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'X-Cache': 'MISS',
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'X-Chunks': String(chunks.length),
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'ETag': etag,
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'Content-Length': String(combinedBuffer.byteLength),
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'Cache-Control': 'private, max-age=1800',
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'Vary': 'x-tts-provider, x-openai-key, x-openai-base-url'
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}
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});
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}
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// De-duplicate identical in-flight requests
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const existing = inflightRequests.get(cacheKey);
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if (existing) {
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@ -265,13 +446,14 @@ export async function POST(req: NextRequest) {
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}
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const controller = new AbortController();
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const startTime = Date.now();
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const entry: InflightEntry = {
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controller,
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consumers: 1,
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promise: (async () => {
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try {
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const buffer = await fetchTTSBufferWithRetry(openai, createParams, controller.signal);
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// Save to cache
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console.log(`[TTS] ${provider} ${text.length} chars -> ${buffer.byteLength} bytes in ${Date.now() - startTime}ms`);
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ttsAudioCache.set(cacheKey, buffer);
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return buffer;
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} finally {
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@ -32,6 +32,7 @@ import { useTTS } from '@/contexts/TTSContext';
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import { useConfig } from '@/contexts/ConfigContext';
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import { normalizeTextForTts } from '@/lib/nlp';
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import { withRetry, getAudiobookStatus, generateTTS, createAudiobookChapter } from '@/lib/client';
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import { processWithConcurrencyLimit } from '@/lib/concurrency';
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import {
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extractTextFromPDF,
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highlightPattern,
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@ -94,6 +95,9 @@ interface PDFContextType {
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settings?: AudiobookGenerationSettings
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) => Promise<TTSAudiobookChapter>;
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isAudioCombining: boolean;
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// Page mapping from chapter index to PDF page number (1-based)
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pageMapping: Map<number, number>;
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setPageMapping: (mapping: Map<number, number>) => void;
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}
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// Create the context
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@ -143,6 +147,8 @@ export function PDFProvider({ children }: { children: ReactNode }) {
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const [isAudioCombining] = useState(false);
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const pageTextCacheRef = useRef<Map<number, string>>(new Map());
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const [currDocPage, setCurrDocPage] = useState<number>(currDocPageNumber);
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// Page mapping: chapter index -> PDF page number (1-based)
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const [pageMapping, setPageMapping] = useState<Map<number, number>>(new Map());
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useEffect(() => {
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setCurrDocPage(currDocPageNumber);
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@ -266,6 +272,9 @@ export function PDFProvider({ children }: { children: ReactNode }) {
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stop();
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}, [setCurrDocPages, stop]);
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// Maximum concurrent TTS requests (configurable via env or default to 3)
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const MAX_CONCURRENT_TTS = 3;
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/**
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* Creates a complete audiobook by processing all PDF pages through NLP and TTS
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* @param {Function} onProgress - Callback for progress updates
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@ -299,10 +308,18 @@ export function PDFProvider({ children }: { children: ReactNode }) {
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const effectiveNativeSpeed = settings?.nativeSpeed ?? voiceSpeed;
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const effectiveFormat = settings?.format ?? format;
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// First pass: extract and measure all text
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const textPerPage: string[] = [];
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// Single-pass: extract, measure, and store text for all pages
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interface PageData {
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index: number; // Chapter index (0-based, sequential for non-empty pages)
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pdfPage: number; // PDF page number (1-based)
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text: string;
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length: number;
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}
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const pages: PageData[] = [];
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let totalLength = 0;
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let chapterIndex = 0;
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for (let pageNum = 1; pageNum <= pdfDocument.numPages; pageNum++) {
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const rawText = await extractTextFromPDF(pdfDocument, pageNum, {
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header: headerMargin,
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@ -313,9 +330,9 @@ export function PDFProvider({ children }: { children: ReactNode }) {
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const trimmedText = rawText.trim();
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if (trimmedText) {
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const processedText = smartSentenceSplitting ? normalizeTextForTts(trimmedText) : trimmedText;
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textPerPage.push(processedText);
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pages.push({ index: chapterIndex, pdfPage: pageNum, text: processedText, length: processedText.length });
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totalLength += processedText.length;
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chapterIndex++;
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}
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}
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@ -323,8 +340,16 @@ export function PDFProvider({ children }: { children: ReactNode }) {
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throw new Error('No text content found in PDF');
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}
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// Store page mapping for regeneration optimization (chapter index -> PDF page number)
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const newMapping = new Map<number, number>();
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for (const page of pages) {
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newMapping.set(page.index, page.pdfPage);
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}
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setPageMapping(newMapping);
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let processedLength = 0;
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let bookId: string = providedBookId || '';
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// Generate bookId upfront if not provided to ensure all concurrent requests use the same ID
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const bookId: string = providedBookId || crypto.randomUUID();
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// If we have a bookId, check for existing chapters to determine which indices already exist
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const existingIndices = new Set<number>();
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@ -344,110 +369,114 @@ export function PDFProvider({ children }: { children: ReactNode }) {
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}
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}
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// Second pass: process text into audio
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for (let i = 0; i < textPerPage.length; i++) {
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// Check for abort at the start of iteration
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if (signal?.aborted) {
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console.log('Generation cancelled by user');
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if (bookId) {
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return bookId; // Return bookId with partial progress
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// Account for already-completed pages in progress
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for (const page of pages) {
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if (existingIndices.has(page.index)) {
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processedLength += page.length;
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}
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}
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onProgress((processedLength / totalLength) * 100);
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// Filter to pending pages only
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const pendingPages = pages.filter(p => !existingIndices.has(p.index));
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if (pendingPages.length === 0) {
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if (!bookId) {
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throw new Error('No audio was generated from the PDF content');
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}
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return bookId;
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}
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const retryOptions: TTSRetryOptions = {
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maxRetries: 3,
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initialDelay: 1000,
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maxDelay: 5000,
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backoffFactor: 2
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};
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// Process pages concurrently with limit
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const results = await processWithConcurrencyLimit(
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pendingPages,
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async (page) => {
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if (signal?.aborted) {
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throw new DOMException('Aborted', 'AbortError');
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}
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throw new Error('Audiobook generation cancelled');
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}
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const text = textPerPage[i];
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// Skip pages that already exist on disk (supports non-contiguous indices)
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if (existingIndices.has(i)) {
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processedLength += text.length;
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onProgress((processedLength / totalLength) * 100);
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continue;
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}
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const reqHeaders: TTSRequestHeaders = {
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'Content-Type': 'application/json',
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'x-openai-key': apiKey,
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'x-openai-base-url': baseUrl,
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'x-tts-provider': effectiveProvider,
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};
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const reqHeaders: TTSRequestHeaders = {
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'Content-Type': 'application/json',
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'x-openai-key': apiKey,
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'x-openai-base-url': baseUrl,
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'x-tts-provider': effectiveProvider,
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};
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const reqBody: TTSRequestPayload = {
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text: page.text,
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voice: effectiveVoice,
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speed: effectiveNativeSpeed,
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format: 'mp3',
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model: effectiveModel,
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instructions: effectiveModel === 'gpt-4o-mini-tts' ? ttsInstructions : undefined
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};
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|
||||
const reqBody: TTSRequestPayload = {
|
||||
text,
|
||||
voice: effectiveVoice,
|
||||
speed: effectiveNativeSpeed,
|
||||
format: 'mp3',
|
||||
model: effectiveModel,
|
||||
instructions: effectiveModel === 'gpt-4o-mini-tts' ? ttsInstructions : undefined
|
||||
};
|
||||
|
||||
const retryOptions: TTSRetryOptions = {
|
||||
maxRetries: 3,
|
||||
initialDelay: 1000,
|
||||
maxDelay: 5000,
|
||||
backoffFactor: 2
|
||||
};
|
||||
|
||||
try {
|
||||
const audioBuffer = await withRetry(
|
||||
async () => {
|
||||
// Check for abort before starting TTS request
|
||||
if (signal?.aborted) {
|
||||
throw new DOMException('Aborted', 'AbortError');
|
||||
}
|
||||
|
||||
return await generateTTS(reqBody, reqHeaders, signal);
|
||||
},
|
||||
retryOptions
|
||||
);
|
||||
|
||||
const chapterTitle = `Page ${i + 1}`;
|
||||
|
||||
// Check for abort before sending to server
|
||||
if (signal?.aborted) {
|
||||
console.log('Generation cancelled before saving page');
|
||||
if (bookId) {
|
||||
return bookId;
|
||||
}
|
||||
throw new Error('Audiobook generation cancelled');
|
||||
throw new DOMException('Aborted', 'AbortError');
|
||||
}
|
||||
|
||||
const chapterTitle = `Page ${page.index + 1}`;
|
||||
|
||||
// Send to server for conversion and storage
|
||||
const chapter = await createAudiobookChapter({
|
||||
chapterTitle,
|
||||
buffer: Array.from(new Uint8Array(audioBuffer)),
|
||||
bookId,
|
||||
format: effectiveFormat,
|
||||
chapterIndex: i,
|
||||
chapterIndex: page.index,
|
||||
settings
|
||||
}, signal);
|
||||
|
||||
if (!bookId) {
|
||||
bookId = chapter.bookId!;
|
||||
}
|
||||
|
||||
// Notify about completed chapter
|
||||
// Update progress (thread-safe since JS is single-threaded for sync operations)
|
||||
processedLength += page.length;
|
||||
onProgress((processedLength / totalLength) * 100);
|
||||
|
||||
if (onChapterComplete) {
|
||||
onChapterComplete(chapter);
|
||||
}
|
||||
|
||||
processedLength += text.length;
|
||||
onProgress((processedLength / totalLength) * 100);
|
||||
return chapter;
|
||||
},
|
||||
MAX_CONCURRENT_TTS,
|
||||
signal
|
||||
);
|
||||
|
||||
} catch (error) {
|
||||
if (error instanceof Error && (error.name === 'AbortError' || error.message.includes('cancelled'))) {
|
||||
// Handle errors from concurrent processing
|
||||
for (let i = 0; i < results.length; i++) {
|
||||
const result = results[i];
|
||||
if (result.status === 'rejected') {
|
||||
const error = result.reason;
|
||||
if (error.name === 'AbortError' || error.message.includes('cancelled') || error.message.includes('Aborted')) {
|
||||
console.log('TTS request aborted, returning partial progress');
|
||||
if (bookId) {
|
||||
return bookId; // Return with partial progress
|
||||
return bookId;
|
||||
}
|
||||
throw new Error('Audiobook generation cancelled');
|
||||
}
|
||||
console.error('Error processing page:', error);
|
||||
|
||||
|
||||
// Notify about error
|
||||
if (onChapterComplete) {
|
||||
onChapterComplete({
|
||||
index: i,
|
||||
title: `Page ${i + 1}`,
|
||||
index: pendingPages[i].index,
|
||||
title: `Page ${pendingPages[i].index + 1}`,
|
||||
status: 'error',
|
||||
bookId,
|
||||
format: effectiveFormat
|
||||
|
|
@ -456,10 +485,6 @@ export function PDFProvider({ children }: { children: ReactNode }) {
|
|||
}
|
||||
}
|
||||
|
||||
if (!bookId) {
|
||||
throw new Error('No audio was generated from the PDF content');
|
||||
}
|
||||
|
||||
return bookId;
|
||||
} catch (error) {
|
||||
console.error('Error creating audiobook:', error);
|
||||
|
|
@ -495,26 +520,31 @@ export function PDFProvider({ children }: { children: ReactNode }) {
|
|||
const effectiveNativeSpeed = settings?.nativeSpeed ?? voiceSpeed;
|
||||
const effectiveFormat = settings?.format ?? format;
|
||||
|
||||
// IMPORTANT: Chapter indices are based on non-empty pages used during generation.
|
||||
// Build a mapping of "chapterIndex" -> actual PDF page number (1-based).
|
||||
const nonEmptyPages: number[] = [];
|
||||
for (let page = 1; page <= pdfDocument.numPages; page++) {
|
||||
const pageText = await extractTextFromPDF(pdfDocument, page, {
|
||||
header: headerMargin,
|
||||
footer: footerMargin,
|
||||
left: leftMargin,
|
||||
right: rightMargin
|
||||
});
|
||||
if (pageText.trim()) {
|
||||
nonEmptyPages.push(page);
|
||||
// Use cached page mapping if available, otherwise rebuild it
|
||||
let pageNum: number | undefined = pageMapping.get(chapterIndex);
|
||||
|
||||
if (pageNum === undefined) {
|
||||
// Fallback: Build mapping by scanning non-empty pages
|
||||
// This happens when regenerating without having generated the full audiobook first
|
||||
const nonEmptyPages: number[] = [];
|
||||
for (let page = 1; page <= pdfDocument.numPages; page++) {
|
||||
const pageText = await extractTextFromPDF(pdfDocument, page, {
|
||||
header: headerMargin,
|
||||
footer: footerMargin,
|
||||
left: leftMargin,
|
||||
right: rightMargin
|
||||
});
|
||||
if (pageText.trim()) {
|
||||
nonEmptyPages.push(page);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (chapterIndex < 0 || chapterIndex >= nonEmptyPages.length) {
|
||||
throw new Error('Invalid chapter index');
|
||||
}
|
||||
if (chapterIndex < 0 || chapterIndex >= nonEmptyPages.length) {
|
||||
throw new Error('Invalid chapter index');
|
||||
}
|
||||
|
||||
const pageNum = nonEmptyPages[chapterIndex];
|
||||
pageNum = nonEmptyPages[chapterIndex];
|
||||
}
|
||||
|
||||
// Extract text from the mapped page
|
||||
const rawText = await extractTextFromPDF(pdfDocument, pageNum, {
|
||||
|
|
@ -594,7 +624,7 @@ export function PDFProvider({ children }: { children: ReactNode }) {
|
|||
console.error('Error regenerating page:', error);
|
||||
throw error;
|
||||
}
|
||||
}, [pdfDocument, headerMargin, footerMargin, leftMargin, rightMargin, apiKey, baseUrl, voice, voiceSpeed, ttsProvider, ttsModel, ttsInstructions, smartSentenceSplitting]);
|
||||
}, [pdfDocument, headerMargin, footerMargin, leftMargin, rightMargin, apiKey, baseUrl, voice, voiceSpeed, ttsProvider, ttsModel, ttsInstructions, smartSentenceSplitting, pageMapping]);
|
||||
|
||||
/**
|
||||
* Effect hook to initialize TTS as non-EPUB mode
|
||||
|
|
@ -632,6 +662,8 @@ export function PDFProvider({ children }: { children: ReactNode }) {
|
|||
createFullAudioBook,
|
||||
regenerateChapter,
|
||||
isAudioCombining,
|
||||
pageMapping,
|
||||
setPageMapping,
|
||||
}),
|
||||
[
|
||||
onDocumentLoadSuccess,
|
||||
|
|
@ -646,6 +678,7 @@ export function PDFProvider({ children }: { children: ReactNode }) {
|
|||
createFullAudioBook,
|
||||
regenerateChapter,
|
||||
isAudioCombining,
|
||||
pageMapping,
|
||||
]
|
||||
);
|
||||
|
||||
|
|
|
|||
|
|
@ -1,6 +1,6 @@
|
|||
import { spawn } from 'child_process';
|
||||
import path from 'path';
|
||||
import { readdir } from 'fs/promises';
|
||||
import { readdir, readFile } from 'fs/promises';
|
||||
|
||||
export type StoredChapter = {
|
||||
index: number;
|
||||
|
|
@ -166,12 +166,25 @@ export async function listStoredChapters(dir: string, signal?: AbortSignal): Pro
|
|||
|
||||
const filePath = path.join(dir, file);
|
||||
|
||||
// Try reading cached duration first to avoid ffprobe calls
|
||||
const durationPath = path.join(dir, `${decodedFromName.index}.duration`);
|
||||
let durationSec: number | undefined;
|
||||
try {
|
||||
const probe = await ffprobeAudio(filePath, signal);
|
||||
durationSec = probe.durationSec;
|
||||
const cached = await readFile(durationPath, 'utf8');
|
||||
const parsed = parseFloat(cached);
|
||||
if (Number.isFinite(parsed) && parsed > 0) {
|
||||
durationSec = parsed;
|
||||
}
|
||||
} catch {}
|
||||
|
||||
// Only ffprobe if no cached duration
|
||||
if (durationSec === undefined) {
|
||||
try {
|
||||
const probe = await ffprobeAudio(filePath, signal);
|
||||
durationSec = probe.durationSec;
|
||||
} catch {}
|
||||
}
|
||||
|
||||
results.push({
|
||||
index: decodedFromName.index,
|
||||
title: decodedFromName.title,
|
||||
|
|
@ -208,12 +221,26 @@ export async function findStoredChapterByIndex(
|
|||
if (!decoded) return null;
|
||||
|
||||
const filePath = path.join(dir, candidate);
|
||||
|
||||
// Try reading cached duration first
|
||||
const durationPath = path.join(dir, `${decoded.index}.duration`);
|
||||
let durationSec: number | undefined;
|
||||
try {
|
||||
const probe = await ffprobeAudio(filePath, signal);
|
||||
durationSec = probe.durationSec;
|
||||
const cached = await readFile(durationPath, 'utf8');
|
||||
const parsed = parseFloat(cached);
|
||||
if (Number.isFinite(parsed) && parsed > 0) {
|
||||
durationSec = parsed;
|
||||
}
|
||||
} catch {}
|
||||
|
||||
// Only ffprobe if no cached duration
|
||||
if (durationSec === undefined) {
|
||||
try {
|
||||
const probe = await ffprobeAudio(filePath, signal);
|
||||
durationSec = probe.durationSec;
|
||||
} catch {}
|
||||
}
|
||||
|
||||
return {
|
||||
index: decoded.index,
|
||||
title: decoded.title,
|
||||
|
|
|
|||
Loading…
Reference in a new issue