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