From 1896bca09e088b0da9d5e845407ecebae330618c Mon Sep 17 00:00:00 2001
From: Chocobozzz <me@florianbigard.com>
Date: Thu, 28 Jan 2021 15:52:44 +0100
Subject: Support transcoding options/encoders by plugins

---
 server/lib/video-transcoding-profiles.ts | 119 +++++++++++++++++++++++++------
 1 file changed, 98 insertions(+), 21 deletions(-)

(limited to 'server/lib/video-transcoding-profiles.ts')

diff --git a/server/lib/video-transcoding-profiles.ts b/server/lib/video-transcoding-profiles.ts
index bbe556e75..76d38b6ca 100644
--- a/server/lib/video-transcoding-profiles.ts
+++ b/server/lib/video-transcoding-profiles.ts
@@ -1,6 +1,6 @@
 import { logger } from '@server/helpers/logger'
-import { getTargetBitrate, VideoResolution } from '../../shared/models/videos'
-import { AvailableEncoders, buildStreamSuffix, EncoderOptionsBuilder } from '../helpers/ffmpeg-utils'
+import { AvailableEncoders, EncoderOptionsBuilder, getTargetBitrate, VideoResolution } from '../../shared/models/videos'
+import { buildStreamSuffix, resetSupportedEncoders } from '../helpers/ffmpeg-utils'
 import {
   canDoQuickAudioTranscode,
   ffprobePromise,
@@ -84,16 +84,8 @@ class VideoTranscodingProfilesManager {
 
   // 1 === less priority
   private readonly encodersPriorities = {
-    video: [
-      { name: 'libx264', priority: 100 }
-    ],
-
-    // Try the first one, if not available try the second one etc
-    audio: [
-      // we favor VBR, if a good AAC encoder is available
-      { name: 'libfdk_aac', priority: 200 },
-      { name: 'aac', priority: 100 }
-    ]
+    vod: this.buildDefaultEncodersPriorities(),
+    live: this.buildDefaultEncodersPriorities()
   }
 
   private readonly availableEncoders = {
@@ -118,25 +110,77 @@ class VideoTranscodingProfilesManager {
     }
   }
 
-  private constructor () {
+  private availableProfiles = {
+    vod: [] as string[],
+    live: [] as string[]
+  }
 
+  private constructor () {
+    this.buildAvailableProfiles()
   }
 
   getAvailableEncoders (): AvailableEncoders {
-    const encodersToTry = {
-      video: this.getEncodersByPriority('video'),
-      audio: this.getEncodersByPriority('audio')
+    return {
+      available: this.availableEncoders,
+      encodersToTry: {
+        vod: {
+          video: this.getEncodersByPriority('vod', 'video'),
+          audio: this.getEncodersByPriority('vod', 'audio')
+        },
+        live: {
+          video: this.getEncodersByPriority('live', 'video'),
+          audio: this.getEncodersByPriority('live', 'audio')
+        }
+      }
     }
-
-    return Object.assign({}, this.availableEncoders, { encodersToTry })
   }
 
   getAvailableProfiles (type: 'vod' | 'live') {
-    return this.availableEncoders[type]
+    return this.availableProfiles[type]
+  }
+
+  addProfile (options: {
+    type: 'vod' | 'live'
+    encoder: string
+    profile: string
+    builder: EncoderOptionsBuilder
+  }) {
+    const { type, encoder, profile, builder } = options
+
+    const encoders = this.availableEncoders[type]
+
+    if (!encoders[encoder]) encoders[encoder] = {}
+    encoders[encoder][profile] = builder
+
+    this.buildAvailableProfiles()
+  }
+
+  removeProfile (options: {
+    type: 'vod' | 'live'
+    encoder: string
+    profile: string
+  }) {
+    const { type, encoder, profile } = options
+
+    delete this.availableEncoders[type][encoder][profile]
+    this.buildAvailableProfiles()
   }
 
-  private getEncodersByPriority (type: 'video' | 'audio') {
-    return this.encodersPriorities[type]
+  addEncoderPriority (type: 'vod' | 'live', streamType: 'audio' | 'video', encoder: string, priority: number) {
+    this.encodersPriorities[type][streamType].push({ name: encoder, priority })
+
+    resetSupportedEncoders()
+  }
+
+  removeEncoderPriority (type: 'vod' | 'live', streamType: 'audio' | 'video', encoder: string, priority: number) {
+    this.encodersPriorities[type][streamType] = this.encodersPriorities[type][streamType]
+                                                    .filter(o => o.name !== encoder && o.priority !== priority)
+
+    resetSupportedEncoders()
+  }
+
+  private getEncodersByPriority (type: 'vod' | 'live', streamType: 'audio' | 'video') {
+    return this.encodersPriorities[type][streamType]
       .sort((e1, e2) => {
         if (e1.priority > e2.priority) return -1
         else if (e1.priority === e2.priority) return 0
@@ -146,6 +190,39 @@ class VideoTranscodingProfilesManager {
       .map(e => e.name)
   }
 
+  private buildAvailableProfiles () {
+    for (const type of [ 'vod', 'live' ]) {
+      const result = new Set()
+
+      const encoders = this.availableEncoders[type]
+
+      for (const encoderName of Object.keys(encoders)) {
+        for (const profile of Object.keys(encoders[encoderName])) {
+          result.add(profile)
+        }
+      }
+
+      this.availableProfiles[type] = Array.from(result)
+    }
+
+    logger.debug('Available transcoding profiles built.', { availableProfiles: this.availableProfiles })
+  }
+
+  private buildDefaultEncodersPriorities () {
+    return {
+      video: [
+        { name: 'libx264', priority: 100 }
+      ],
+
+      // Try the first one, if not available try the second one etc
+      audio: [
+        // we favor VBR, if a good AAC encoder is available
+        { name: 'libfdk_aac', priority: 200 },
+        { name: 'aac', priority: 100 }
+      ]
+    }
+  }
+
   static get Instance () {
     return this.instance || (this.instance = new this())
   }
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