The estimate behind the server-side time range management for renderers that cannot seek themselves: from a playback time to a byte position of the file. More...

Collaboration diagram for de.yaacc.share.SeekPositionCalculator:

Static Public Member Functions
static long	bytePositionForTime (long totalSize, long timeMs, long totalDurationMs)

static long	estimateDurationMs (long totalSize)
	Guesses the duration of a file from its size at 128 kbit/s: `size * 8 * 1000 / (128 * 1024)`, computed without overflow.

Detailed Description

The estimate behind the server-side time range management for renderers that cannot seek themselves: from a playback time to a byte position of the file.

Plain Java, long/double arithmetic that cannot overflow; every result is inside the file.

The formula is the one of the original implementation: the first 10 percent of the file are treated as header/metadata, the playback time is spread over the remaining 90 percent, and the result never goes beyond 85 percent of the file. The duration is guessed from the file size assuming 128 kbit/s.

Member Function Documentation

◆ bytePositionForTime()

static long de.yaacc.share.SeekPositionCalculator.bytePositionForTime	(	long	totalSize,
		long	timeMs,
		long	totalDurationMs )

static

Parameters

totalSize	size of the file in bytes; <= 0 means unknown
timeMs	playback time in milliseconds
totalDurationMs	duration in milliseconds; <= 0 means unknown

Returns: the byte position, 0 if the size or the duration is unknown, never negative and never beyond 85 percent of the file

Referenced by de.yaacc.share.ServerSideSeeking.plan().

Here is the caller graph for this function:

◆ estimateDurationMs()

static long de.yaacc.share.SeekPositionCalculator.estimateDurationMs ( long totalSize )