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Compact HE-AAC audio saves: server lane with fdkaac, shrink saved songs from Saved videos

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This commit is contained in:
Jonathan Sykes
2026-10-18 17:28:47 +08:00
parent eef9fbf05f
commit b48d36b3dd
12 changed files with 342 additions and 22 deletions
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35
server/server.js
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@@ -1348,6 +1348,9 @@ const media = createMediaCache({
},
ffmpeg: FFMPEG,
ffprobe: process.env.FFPROBE_PATH || 'ffprobe',
// Compact HE-AAC audio for phone saves (?audio=he). MEDIA_COMPACT_AUDIO=0 turns it off.
fdkaac: process.env.FDKAAC_PATH || 'fdkaac',
compact: { enabled: process.env.MEDIA_COMPACT_AUDIO !== '0', bitrate: envNum('MEDIA_COMPACT_BITRATE', 48000) },
maxBytes: envNum('MEDIA_CACHE_MAX_BYTES', 10 * 1024 ** 3),
minFreeBytes: envNum('MEDIA_MIN_FREE_BYTES', 5 * 1024 ** 3),
autoMaxSeconds: envNum('MEDIA_AUTO_MAX_SECONDS', 3 * 3600),
@@ -1738,6 +1741,20 @@ registerDownloadRetryRoute(app, {
media, priority: HIGH, clearHints: id => { prepareSkips.delete(id); streamCache.delete(id); },
});
const DOWNLOAD_EXPOSE = 'X-Content-SHA256, Content-Range, Content-Length, ETag, Accept-Ranges';
function compactDownloadResponse(c, videoId, fp, he) {
if (fp && !c.req.header('range')) recordVideoAccess(fp, { id: videoId }).catch(() => {});
media.touch(videoId);
return rangeFileResponse(c, he.path, 'audio/mp4', 'no-store', {
etag: `"${videoId}.${he.gen}.he"`,
headers: {
'Content-Disposition': `attachment; filename="${videoId}.m4a"`,
'Access-Control-Allow-Origin': '*',
'Access-Control-Expose-Headers': DOWNLOAD_EXPOSE,
...(he.sha256 ? { 'X-Content-SHA256': he.sha256 } : {}),
},
});
}
function cachedDownloadResponse(c, videoId, fp, row) {
if (fp && !c.req.header('range')) recordVideoAccess(fp, { id: videoId }).catch(() => {});
media.touch(videoId);
@@ -1797,6 +1814,20 @@ app.get('/api/download/:videoId/prepare', async (c) => {
if (ready) {
// ?still=1: the device would rather keep the audio + picture of an
// album-art song than a video of one unchanging frame.
const stillArt = stillAudioPath(videoId, ready) ? { still: true, art: `/api/media/${videoId}/art?g=${ready.gen}` } : {};
// ?audio=he: the phone saves the compact HE-AAC audio (~48 kbps) instead.
// It is made once on the server and kept with the copy; until it exists
// the device polls like for any other preparing save.
if (c.req.query('audio') === 'he') {
const he = await media.compactAudio(videoId);
if (he.status === 'ready') {
media.touch(videoId);
return c.json({ ok: true, state: 'ready', gen: he.gen, size: he.size, sha256: he.sha256 || null,
etag: `"${videoId}.${he.gen}.he"`, ext: 'm4a', compact: true, ...stillArt }, 200, nocache);
}
if (he.status === 'working') return c.json({ ok: true, state: 'working', status: 'compressing' }, 200, nocache);
// 'off' (no encoder, or this song didn't shrink): the normal answer below.
}
const stillAudio = c.req.query('still') === '1' ? stillAudioPath(videoId, ready) : null;
if (stillAudio) {
media.touch(videoId);
@@ -1879,6 +1910,10 @@ app.get('/api/download/:videoId', async (c) => {
let cacheErr = null;
try {
const row = await media.ensureCached(videoId, { priority: HIGH });
if (c.req.query('audio') === 'he') {
const he = await media.compactAudio(videoId);
if (he.status === 'ready') return compactDownloadResponse(c, videoId, fp, he);
}
// A device that can't decode HEVC must not save the HEVC copy — give it
// the legacy H.264 save instead (the ?mux=1 path included).
if (servableTo(row, c.req.query('hevc') === '1') || stillAudioPath(videoId, row) && c.req.query('still') === '1') {