From 092092969633bbcf6d4891a083ea497a7d5c3154 Mon Sep 17 00:00:00 2001
From: Chocobozzz <me@florianbigard.com>
Date: Tue, 29 Jan 2019 08:37:25 +0100
Subject: Add hls support on server

---
 server/lib/hls.ts | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 server/lib/hls.ts

(limited to 'server/lib/hls.ts')

diff --git a/server/lib/hls.ts b/server/lib/hls.ts
new file mode 100644
index 000000000..10db6c3c3
--- /dev/null
+++ b/server/lib/hls.ts
@@ -0,0 +1,110 @@
+import { VideoModel } from '../models/video/video'
+import { basename, dirname, join } from 'path'
+import { HLS_PLAYLIST_DIRECTORY, CONFIG } from '../initializers'
+import { outputJSON, pathExists, readdir, readFile, remove, writeFile, move } from 'fs-extra'
+import { getVideoFileSize } from '../helpers/ffmpeg-utils'
+import { sha256 } from '../helpers/core-utils'
+import { VideoStreamingPlaylistModel } from '../models/video/video-streaming-playlist'
+import HLSDownloader from 'hlsdownloader'
+import { logger } from '../helpers/logger'
+import { parse } from 'url'
+
+async function updateMasterHLSPlaylist (video: VideoModel) {
+  const directory = join(HLS_PLAYLIST_DIRECTORY, video.uuid)
+  const masterPlaylists: string[] = [ '#EXTM3U', '#EXT-X-VERSION:3' ]
+  const masterPlaylistPath = join(directory, VideoStreamingPlaylistModel.getMasterHlsPlaylistFilename())
+
+  for (const file of video.VideoFiles) {
+    // If we did not generated a playlist for this resolution, skip
+    const filePlaylistPath = join(directory, VideoStreamingPlaylistModel.getHlsPlaylistFilename(file.resolution))
+    if (await pathExists(filePlaylistPath) === false) continue
+
+    const videoFilePath = video.getVideoFilePath(file)
+
+    const size = await getVideoFileSize(videoFilePath)
+
+    const bandwidth = 'BANDWIDTH=' + video.getBandwidthBits(file)
+    const resolution = `RESOLUTION=${size.width}x${size.height}`
+
+    let line = `#EXT-X-STREAM-INF:${bandwidth},${resolution}`
+    if (file.fps) line += ',FRAME-RATE=' + file.fps
+
+    masterPlaylists.push(line)
+    masterPlaylists.push(VideoStreamingPlaylistModel.getHlsPlaylistFilename(file.resolution))
+  }
+
+  await writeFile(masterPlaylistPath, masterPlaylists.join('\n') + '\n')
+}
+
+async function updateSha256Segments (video: VideoModel) {
+  const directory = join(HLS_PLAYLIST_DIRECTORY, video.uuid)
+  const files = await readdir(directory)
+  const json: { [filename: string]: string} = {}
+
+  for (const file of files) {
+    if (file.endsWith('.ts') === false) continue
+
+    const buffer = await readFile(join(directory, file))
+    const filename = basename(file)
+
+    json[filename] = sha256(buffer)
+  }
+
+  const outputPath = join(directory, VideoStreamingPlaylistModel.getHlsSha256SegmentsFilename())
+  await outputJSON(outputPath, json)
+}
+
+function downloadPlaylistSegments (playlistUrl: string, destinationDir: string, timeout: number) {
+  let timer
+
+  logger.info('Importing HLS playlist %s', playlistUrl)
+
+  const params = {
+    playlistURL: playlistUrl,
+    destination: CONFIG.STORAGE.TMP_DIR
+  }
+  const downloader = new HLSDownloader(params)
+
+  const hlsDestinationDir = join(CONFIG.STORAGE.TMP_DIR, dirname(parse(playlistUrl).pathname))
+
+  return new Promise<string>(async (res, rej) => {
+    downloader.startDownload(err => {
+      clearTimeout(timer)
+
+      if (err) {
+        deleteTmpDirectory(hlsDestinationDir)
+
+        return rej(err)
+      }
+
+      move(hlsDestinationDir, destinationDir, { overwrite: true })
+        .then(() => res())
+        .catch(err => {
+          deleteTmpDirectory(hlsDestinationDir)
+
+          return rej(err)
+        })
+    })
+
+    timer = setTimeout(() => {
+      deleteTmpDirectory(hlsDestinationDir)
+
+      return rej(new Error('HLS download timeout.'))
+    }, timeout)
+
+    function deleteTmpDirectory (directory: string) {
+      remove(directory)
+        .catch(err => logger.error('Cannot delete path on HLS download error.', { err }))
+    }
+  })
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  updateMasterHLSPlaylist,
+  updateSha256Segments,
+  downloadPlaylistSegments
+}
+
+// ---------------------------------------------------------------------------
-- 
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