barbercollie/ReadMeABook
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Add series fields to audiobooks and update related logic

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Introduces 'series' and 'seriesPart' fields to the Audiobook model and database schema. Updates API routes, file organization, and path template utilities to support series metadata. Enhances chapter merging logic, improves notification backend testing, and expands test coverage for admin and API routes.
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kikootwo
2026-01-22 15:56:55 -05:00
parent dc7e557694
commit 31bca0052f
105 changed files with 10384 additions and 75 deletions
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src/lib/utils/chapter-merger.ts
+22 -3
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@@ -447,6 +447,23 @@ function determineOutputBitrate(chapters: ChapterFile[]): string {
return `${finalBitrate}k`;
}
/**
* Map bitrate to native AAC VBR quality value
* Quality range: 0.1-5 (higher = better quality/larger file)
*/
function bitrateToVbrQuality(bitrateStr: string): number {
const bitrate = parseInt(bitrateStr.replace('k', ''));
// Approximate mapping based on AAC VBR behavior
if (bitrate <= 64) return 1.0; // ~64kbps
if (bitrate <= 96) return 1.5; // ~96kbps
if (bitrate <= 128) return 2.0; // ~128kbps
if (bitrate <= 160) return 2.5; // ~160kbps
if (bitrate <= 192) return 3.0; // ~192kbps
if (bitrate <= 256) return 4.0; // ~256kbps
return 4.5; // ~320kbps+ (max quality)
}
/**
* Check if libfdk_aac encoder is available (higher quality than native AAC)
*/
@@ -640,10 +657,12 @@ export async function mergeChapters(
args.push('-vbr', '4'); // VBR mode 4 (~128-160kbps, high quality)
await logger?.info(`Merge strategy: Re-encoding MP3 → AAC/M4B using libfdk_aac (high quality VBR, target ~${bitrate})`);
} else {
// Use VBR for better quality at same average bitrate
const vbrQuality = bitrateToVbrQuality(bitrate);
args.push('-c:a', 'aac');
args.push('-b:a', bitrate);
args.push('-q:a', vbrQuality.toString());
args.push('-profile:a', 'aac_low'); // AAC-LC profile for maximum compatibility
await logger?.info(`Merge strategy: Re-encoding MP3 → AAC/M4B using native AAC at ${bitrate}`);
await logger?.info(`Merge strategy: Re-encoding MP3 → AAC/M4B using native AAC VBR (quality ${vbrQuality}, target ~${bitrate})`);
}
} else {
// M4A/M4B -> M4B can use codec copy (fast, lossless)
@@ -838,7 +857,7 @@ async function validateMergedFile(
const stats = await fs.stat(outputPath);
const sizeMB = stats.size / 1024 / 1024;
const durationMinutes = expectedDuration / 1000 / 60;
const expectedMinSize = durationMinutes * 0.5; // ~0.5MB per minute minimum for compressed audio
const expectedMinSize = durationMinutes * 0.4; // ~0.4MB per minute minimum (accommodates 64kbps encoding)
if (sizeMB < expectedMinSize) {
return {