ml
54 lines
1.3 KiB
Go
54 lines
1.3 KiB
Go
package movie
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import (
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"github.com/inkyblackness/hacked/ss1/content/audio"
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"github.com/inkyblackness/hacked/ss1/content/movie/internal/format"
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)
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const audioEntrySize = 0x2000
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// Audio represents the sound part of a movie.
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type Audio struct {
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Sound audio.L8
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}
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func (a Audio) duration() format.Timestamp {
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if a.Sound.SampleRate <= 0 {
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return format.Timestamp{}
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}
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return format.TimestampFromSeconds(a.Sound.Duration())
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}
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func (a Audio) encode() []format.EntryBucket {
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buckets := make([]format.EntryBucket, 0, (len(a.Sound.Samples)/audioEntrySize)+1)
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addBucket := func(ts format.Timestamp, samples []byte) {
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buckets = append(buckets,
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format.EntryBucket{
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Priority: format.EntryBucketPriorityAudio,
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Timestamp: ts,
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Entries: []format.Entry{
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{
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Timestamp: ts,
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Data: format.AudioEntryData{
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Samples: samples,
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},
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},
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},
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})
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}
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startOffset := 0
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for (startOffset + audioEntrySize) <= len(a.Sound.Samples) {
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ts := format.TimestampFromSeconds(float32(startOffset) / a.Sound.SampleRate)
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endOffset := startOffset + audioEntrySize
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addBucket(ts, a.Sound.Samples[startOffset:endOffset])
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startOffset = endOffset
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}
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if startOffset < len(a.Sound.Samples) {
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ts := format.TimestampFromSeconds(float32(startOffset) / a.Sound.SampleRate)
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addBucket(ts, a.Sound.Samples[startOffset:])
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}
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return buckets
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}
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