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06aad801 | 1 | import { ffprobe, FfprobeData } from 'fluent-ffmpeg' |
2 | import { VideoFileMetadata } from '@shared/models/videos' | |
3 | ||
4 | /** | |
5 | * | |
6 | * Helpers to run ffprobe and extract data from the JSON output | |
7 | * | |
8 | */ | |
9 | ||
10 | function ffprobePromise (path: string) { | |
11 | return new Promise<FfprobeData>((res, rej) => { | |
12 | ffprobe(path, (err, data) => { | |
13 | if (err) return rej(err) | |
14 | ||
15 | return res(data) | |
16 | }) | |
17 | }) | |
18 | } | |
19 | ||
20 | async function getAudioStream (videoPath: string, existingProbe?: FfprobeData) { | |
21 | // without position, ffprobe considers the last input only | |
22 | // we make it consider the first input only | |
23 | // if you pass a file path to pos, then ffprobe acts on that file directly | |
24 | const data = existingProbe || await ffprobePromise(videoPath) | |
25 | ||
26 | if (Array.isArray(data.streams)) { | |
27 | const audioStream = data.streams.find(stream => stream['codec_type'] === 'audio') | |
28 | ||
29 | if (audioStream) { | |
30 | return { | |
31 | absolutePath: data.format.filename, | |
32 | audioStream, | |
33 | bitrate: parseInt(audioStream['bit_rate'] + '', 10) | |
34 | } | |
35 | } | |
36 | } | |
37 | ||
38 | return { absolutePath: data.format.filename } | |
39 | } | |
40 | ||
41 | function getMaxAudioBitrate (type: 'aac' | 'mp3' | string, bitrate: number) { | |
42 | const maxKBitrate = 384 | |
43 | const kToBits = (kbits: number) => kbits * 1000 | |
44 | ||
45 | // If we did not manage to get the bitrate, use an average value | |
46 | if (!bitrate) return 256 | |
47 | ||
48 | if (type === 'aac') { | |
49 | switch (true) { | |
50 | case bitrate > kToBits(maxKBitrate): | |
51 | return maxKBitrate | |
52 | ||
53 | default: | |
54 | return -1 // we interpret it as a signal to copy the audio stream as is | |
55 | } | |
56 | } | |
57 | ||
58 | /* | |
59 | a 192kbit/sec mp3 doesn't hold as much information as a 192kbit/sec aac. | |
60 | That's why, when using aac, we can go to lower kbit/sec. The equivalences | |
61 | made here are not made to be accurate, especially with good mp3 encoders. | |
62 | */ | |
63 | switch (true) { | |
64 | case bitrate <= kToBits(192): | |
65 | return 128 | |
66 | ||
67 | case bitrate <= kToBits(384): | |
68 | return 256 | |
69 | ||
70 | default: | |
71 | return maxKBitrate | |
72 | } | |
73 | } | |
74 | ||
75 | async function getVideoStreamSize (path: string, existingProbe?: FfprobeData): Promise<{ width: number, height: number }> { | |
76 | const videoStream = await getVideoStreamFromFile(path, existingProbe) | |
77 | ||
78 | return videoStream === null | |
79 | ? { width: 0, height: 0 } | |
80 | : { width: videoStream.width, height: videoStream.height } | |
81 | } | |
82 | ||
83 | async function getVideoFileResolution (path: string, existingProbe?: FfprobeData) { | |
84 | const size = await getVideoStreamSize(path, existingProbe) | |
85 | ||
86 | return { | |
87 | width: size.width, | |
88 | height: size.height, | |
89 | ratio: Math.max(size.height, size.width) / Math.min(size.height, size.width), | |
90 | resolution: Math.min(size.height, size.width), | |
91 | isPortraitMode: size.height > size.width | |
92 | } | |
93 | } | |
94 | ||
95 | async function getVideoFileFPS (path: string, existingProbe?: FfprobeData) { | |
96 | const videoStream = await getVideoStreamFromFile(path, existingProbe) | |
97 | if (videoStream === null) return 0 | |
98 | ||
99 | for (const key of [ 'avg_frame_rate', 'r_frame_rate' ]) { | |
100 | const valuesText: string = videoStream[key] | |
101 | if (!valuesText) continue | |
102 | ||
103 | const [ frames, seconds ] = valuesText.split('/') | |
104 | if (!frames || !seconds) continue | |
105 | ||
106 | const result = parseInt(frames, 10) / parseInt(seconds, 10) | |
107 | if (result > 0) return Math.round(result) | |
108 | } | |
109 | ||
110 | return 0 | |
111 | } | |
112 | ||
113 | async function getMetadataFromFile (path: string, existingProbe?: FfprobeData) { | |
114 | const metadata = existingProbe || await ffprobePromise(path) | |
115 | ||
116 | return new VideoFileMetadata(metadata) | |
117 | } | |
118 | ||
119 | async function getVideoFileBitrate (path: string, existingProbe?: FfprobeData): Promise<number> { | |
120 | const metadata = await getMetadataFromFile(path, existingProbe) | |
121 | ||
122 | let bitrate = metadata.format.bit_rate as number | |
123 | if (bitrate && !isNaN(bitrate)) return bitrate | |
124 | ||
125 | const videoStream = await getVideoStreamFromFile(path, existingProbe) | |
126 | if (!videoStream) return undefined | |
127 | ||
128 | bitrate = videoStream?.bit_rate | |
129 | if (bitrate && !isNaN(bitrate)) return bitrate | |
130 | ||
131 | return undefined | |
132 | } | |
133 | ||
134 | async function getDurationFromVideoFile (path: string, existingProbe?: FfprobeData) { | |
135 | const metadata = await getMetadataFromFile(path, existingProbe) | |
136 | ||
137 | return Math.round(metadata.format.duration) | |
138 | } | |
139 | ||
140 | async function getVideoStreamFromFile (path: string, existingProbe?: FfprobeData) { | |
141 | const metadata = await getMetadataFromFile(path, existingProbe) | |
142 | ||
143 | return metadata.streams.find(s => s.codec_type === 'video') || null | |
144 | } | |
145 | ||
146 | async function canDoQuickAudioTranscode (path: string, probe?: FfprobeData): Promise<boolean> { | |
147 | const parsedAudio = await getAudioStream(path, probe) | |
148 | ||
149 | if (!parsedAudio.audioStream) return true | |
150 | ||
151 | if (parsedAudio.audioStream['codec_name'] !== 'aac') return false | |
152 | ||
153 | const audioBitrate = parsedAudio.bitrate | |
154 | if (!audioBitrate) return false | |
155 | ||
156 | const maxAudioBitrate = getMaxAudioBitrate('aac', audioBitrate) | |
157 | if (maxAudioBitrate !== -1 && audioBitrate > maxAudioBitrate) return false | |
158 | ||
159 | const channelLayout = parsedAudio.audioStream['channel_layout'] | |
160 | // Causes playback issues with Chrome | |
161 | if (!channelLayout || channelLayout === 'unknown') return false | |
162 | ||
163 | return true | |
164 | } | |
165 | ||
166 | // --------------------------------------------------------------------------- | |
167 | ||
168 | export { | |
169 | getVideoStreamSize, | |
170 | getVideoFileResolution, | |
171 | getMetadataFromFile, | |
172 | getMaxAudioBitrate, | |
173 | getVideoStreamFromFile, | |
174 | getDurationFromVideoFile, | |
175 | getAudioStream, | |
176 | getVideoFileFPS, | |
177 | ffprobePromise, | |
178 | getVideoFileBitrate, | |
179 | canDoQuickAudioTranscode | |
180 | } |