Refactored frame/packet side data + added regions of interest to frame side data

skip_samples.go

@@ -0,0 +1,34 @@
+package astiav
+
+import (
+	"encoding/binary"
+	"fmt"
+)
+
+// https://ffmpeg.org/doxygen/7.0/group__lavc__packet__side__data.html#gga9a80bfcacc586b483a973272800edb97a2093332d8086d25a04942ede61007f6a
+// https://ffmpeg.org/doxygen/7.0/group__lavu__frame.html#ggae01fa7e427274293aacdf2adc17076bca6b0b1ee4315f322922710f65d02a146b
+type SkipSamples struct {
+	ReasonEnd   uint8
+	ReasonStart uint8
+	SkipEnd     uint32
+	SkipStart   uint32
+}
+
+func newSkipSamplesFromBytes(b []byte) (*SkipSamples, error) {
+	if len(b) < 10 {
+		return nil, fmt.Errorf("astiav: invalid length %d < 10", len(b))
+	}
+	return &SkipSamples{
+		ReasonEnd:   b[9],
+		ReasonStart: b[8],
+		SkipEnd:     binary.LittleEndian.Uint32(b[4:8]),
+		SkipStart:   binary.LittleEndian.Uint32(b[0:4]),
+	}, nil
+}
+
+func (ss *SkipSamples) bytes() (b []byte) {
+	b = binary.LittleEndian.AppendUint32(b, ss.SkipStart)
+	b = binary.LittleEndian.AppendUint32(b, ss.SkipEnd)
+	b = append(b, ss.ReasonStart, ss.ReasonEnd)
+	return b
+}