Asf final class

Minn\Media\Av\Asf · public/minn/src/Minn/Media/Av/Asf.php · 182 lines

Advanced Systems Format files (WMV, WMA, ASF) as the reference's media reader measures them (probe media-meta). The file properties give the playing time (less the preroll) and creation date; each stream's properties its size or wave format; the codec list the names; the stream bitrates the bitrate, the file's being their sum. A video file with no audio still describes an empty ASF audio stream.

Uses 1

Source

Used by 1

Analyzer

Constants and properties

private	`HEADER` = `'3026b2758e66cf11a6d900aa0062ce6c'`
private	`FILE_PROPERTIES` = `'a1dcab8c47a9cf118ee400c00c205365'`
private	`STREAM_PROPERTIES` = `'9107dcb7b7a9cf118ee600c00c205365'`
private	`STREAM_BITRATES` = `'ce75f87b8d46d1118d82006097c9a2b2'`
private	`CODEC_LIST` = `'4052d1861d31d011a3a400a0c90348f6'`
private	`AUDIO` = `'409e69f84d5bcf11a8fd00805f5c442b'`
private	`VIDEO` = `'c0ef19bc4d5bcf11a8fd00805f5c442b'`
private	`EPOCH` = `11644473600`	Seconds between 1601, where a Windows file time starts, and 1970.

Public

static	`detects(string $head): bool`#	Whether a file's first bytes are an ASF header object.
static	`read(Minn\Media\Av\Source $source): array`#	The file's analysis. `@return array<string, mixed>`

Internals 4

Private and protected methods: how the class does its work. Not a contract; they change whenever the code is tidied.

private	`bitrates(string $body): array`#	Each stream's bitrate by its number. `@return array<int, int>`
private	`codecs(string $body): array`#	The codec list's first video and first audio name. `@return array{video?: string, audio?: string}`
private	`video(string $specific, int\|float\|null $bitrate, ?string $name): array`#	A video stream's size and its codec's name. `@return array<string, mixed>`
private	`audio(string $format, ?string $name): array`#	An audio stream described by its wave format and its codec's name. `@return array<string, mixed>`