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segment.go
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segment.go
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package playback
import (
"io/fs"
"path/filepath"
"sort"
"strings"
"time"
"github.com/bluenviron/mediamtx/internal/conf"
"github.com/bluenviron/mediamtx/internal/record"
)
// Segment is a recording segment.
type Segment struct {
Fpath string
Start time.Time
}
func findSegmentsInTimespan(
pathConf *conf.Path,
pathName string,
start time.Time,
duration time.Duration,
) ([]*Segment, error) {
recordPath := record.PathAddExtension(
strings.ReplaceAll(pathConf.RecordPath, "%path", pathName),
pathConf.RecordFormat,
)
// we have to convert to absolute paths
// otherwise, recordPath and fpath inside Walk() won't have common elements
recordPath, _ = filepath.Abs(recordPath)
commonPath := record.CommonPath(recordPath)
end := start.Add(duration)
var segments []*Segment
err := filepath.Walk(commonPath, func(fpath string, info fs.FileInfo, err error) error {
if err != nil {
return err
}
if !info.IsDir() {
var pa record.Path
ok := pa.Decode(recordPath, fpath)
// gather all segments that starts before the end of the playback
if ok && !end.Before(pa.Start) {
segments = append(segments, &Segment{
Fpath: fpath,
Start: pa.Start,
})
}
}
return nil
})
if err != nil {
return nil, err
}
if segments == nil {
return nil, errNoSegmentsFound
}
sort.Slice(segments, func(i, j int) bool {
return segments[i].Start.Before(segments[j].Start)
})
// find the segment that may contain the start of the playback and remove all previous ones
found := false
for i := 0; i < len(segments)-1; i++ {
if !start.Before(segments[i].Start) && start.Before(segments[i+1].Start) {
segments = segments[i:]
found = true
break
}
}
// otherwise, keep the last segment only and check if it may contain the start of the playback
if !found {
segments = segments[len(segments)-1:]
if segments[len(segments)-1].Start.After(start) {
return nil, errNoSegmentsFound
}
}
return segments, nil
}
// FindSegments returns all segments of a path.
func FindSegments(
pathConf *conf.Path,
pathName string,
) ([]*Segment, error) {
recordPath := record.PathAddExtension(
strings.ReplaceAll(pathConf.RecordPath, "%path", pathName),
pathConf.RecordFormat,
)
// we have to convert to absolute paths
// otherwise, recordPath and fpath inside Walk() won't have common elements
recordPath, _ = filepath.Abs(recordPath)
commonPath := record.CommonPath(recordPath)
var segments []*Segment
err := filepath.Walk(commonPath, func(fpath string, info fs.FileInfo, err error) error {
if err != nil {
return err
}
if !info.IsDir() {
var pa record.Path
ok := pa.Decode(recordPath, fpath)
if ok {
segments = append(segments, &Segment{
Fpath: fpath,
Start: pa.Start,
})
}
}
return nil
})
if err != nil {
return nil, err
}
if segments == nil {
return nil, errNoSegmentsFound
}
sort.Slice(segments, func(i, j int) bool {
return segments[i].Start.Before(segments[j].Start)
})
return segments, nil
}