SampleBuilder: Remove WithPartitionHeadChecker

Deprecated by #1928

BREAKING CHANGE: samplebuilder.WithPartitionHeadChecker
                 option is removed.

pkg/media/samplebuilder/samplebuilder.go

@@ -357,12 +357,6 @@ func timestampDistance(x, y uint32) uint32 {
 // An Option configures a SampleBuilder.
 type Option func(o *SampleBuilder)
 
-// WithPartitionHeadChecker is obsolete, it does nothing.
-func WithPartitionHeadChecker(interface{}) Option {
-	return func(o *SampleBuilder) {
-	}
-}
-
 // WithPacketReleaseHandler set a callback when the builder is about to release
 // some packet.
 func WithPacketReleaseHandler(h func(*rtp.Packet)) Option {

pkg/media/samplebuilder/samplebuilder_test.go

@@ -27,6 +27,7 @@ type sampleBuilderTest struct {
 type fakeDepacketizer struct {
 	headChecker bool
 	headBytes   []byte
+	alwaysHead  bool
 }
 
 func (f *fakeDepacketizer) Unmarshal(r []byte) ([]byte, error) {
@@ -45,6 +46,10 @@ func (f *fakeDepacketizer) IsPartitionHead(payload []byte) bool {
 		return false
 	}
 
+	if f.alwaysHead {
+		return true
+	}
+
 	for _, b := range f.headBytes {
 		if payload[0] == b {
 			return true
@@ -490,16 +495,11 @@ func TestSampleBuilderWithPacketHeadHandler(t *testing.T) {
 	assert.Equal(t, 2, headCount, "two sample heads should have been inspected")
 }
 
-type truePartitionHeadChecker struct{}
-
-func (f *truePartitionHeadChecker) IsPartitionHead([]byte) bool {
-	return true
-}
-
 func TestSampleBuilderData(t *testing.T) {
-	s := New(10, &fakeDepacketizer{}, 1,
-		WithPartitionHeadChecker(&truePartitionHeadChecker{}),
-	)
+	s := New(10, &fakeDepacketizer{
+		headChecker: true,
+		alwaysHead:  true,
+	}, 1)
 	j := 0
 	for i := 0; i < 0x20000; i++ {
 		p := rtp.Packet{