test hls ll

format/fmp4/esio/slconf.go

@@ -0,0 +1,43 @@
+package esio
+
+import "errors"
+
+type SLConfigDescriptor struct {
+	Predefined SLConfigPredefined
+	Custom     []byte
+}
+
+// SLConfigPredefined references a standard SL config by index
+type SLConfigPredefined uint8
+
+// ISO/IEC 14496-1:2004 7.3.2.3.2 Table 12
+const (
+	SLConfigCustom = SLConfigPredefined(iota)
+	SLConfigNull
+	SLConfigMP4
+)
+
+func parseSLConfig(d []byte) (*SLConfigDescriptor, error) {
+	// ISO/IEC 14496-1:2004 7.3.2.3
+	if len(d) == 0 {
+		return nil, errors.New("SLConfigDescriptor short")
+	}
+	sl := &SLConfigDescriptor{Predefined: SLConfigPredefined(d[0])}
+	if sl.Predefined == SLConfigCustom {
+		sl.Custom = d[1:]
+	}
+	return sl, nil
+}
+
+func (c *SLConfigDescriptor) appendTo(b *builder) error {
+	if c == nil {
+		return nil
+	}
+	cursor := b.Descriptor(TagSLConfigDescriptor)
+	defer cursor.DescriptorDone(-1)
+	b.WriteByte(byte(c.Predefined))
+	if c.Predefined == SLConfigCustom {
+		b.Write(c.Custom)
+	}
+	return nil
+}