mirror of
https://github.com/bluenviron/mediamtx.git
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e5ab731d14
* hls source: support fMP4s video streams * hls source: start reading live streams from (end of playlist - starting point) * hls client: wait processing of current fMP4 segment before downloading another one * hls client: support fmp4 trun boxes with default sample duration, flags and size * hls client: merge fmp4 init file reader and writer * hls client: merge fmp4 part reader and writer * hls client: improve precision of go <-> mp4 time conversion * hls client: fix esds generation in go-mp4 * hls client: support audio in separate playlist * hls client: support an arbitrary number of tracks in fmp4 init files * hls client: support EXT-X-BYTERANGE * hls client: support fmp4 segments with multiple parts at once * hls client: support an arbitrary number of mpeg-ts tracks * hls client: synchronize tracks around a primary track * update go-mp4 * hls: synchronize track reproduction around a leading one * hls client: reset stream if playback is too late * hls client: add limit on DTS-RTC difference * hls client: support again streams that don't provide codecs in master playlist
55 lines
1.1 KiB
Go
55 lines
1.1 KiB
Go
package mpegts
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import (
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"sync"
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"time"
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)
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const (
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maximum = 0x1FFFFFFFF // 33 bits
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negativeThreshold = 0x1FFFFFFFF / 2
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clockRate = 90000
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)
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// TimeDecoder is a MPEG-TS timestamp decoder.
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type TimeDecoder struct {
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initialized bool
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tsOverall time.Duration
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tsPrev int64
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mutex sync.Mutex
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}
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// NewTimeDecoder allocates a TimeDecoder.
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func NewTimeDecoder() *TimeDecoder {
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return &TimeDecoder{}
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}
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// Decode decodes a MPEG-TS timestamp.
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func (d *TimeDecoder) Decode(ts int64) time.Duration {
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d.mutex.Lock()
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defer d.mutex.Unlock()
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if !d.initialized {
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d.initialized = true
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d.tsPrev = ts
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return 0
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}
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diff := (ts - d.tsPrev) & maximum
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// negative difference
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if diff > negativeThreshold {
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diff = (d.tsPrev - ts) & maximum
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d.tsPrev = ts
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d.tsOverall -= time.Duration(diff)
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} else {
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d.tsPrev = ts
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d.tsOverall += time.Duration(diff)
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}
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// avoid an int64 overflow and preserve resolution by splitting division into two parts:
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// first add the integer part, then the decimal part.
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secs := d.tsOverall / clockRate
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dec := d.tsOverall % clockRate
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return secs*time.Second + dec*time.Second/clockRate
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}
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