SampleBuilder: Remove PopWithTimestamp

Use Sample.PacketTimestamp field instead.

Migration example:
- sample, timestamp := s.PopWithTimestamp()
+ sample := s.Pop()
+ timestamp := sample.PacketTimestamp

pkg/media/samplebuilder/samplebuilder.go

@@ -330,17 +330,6 @@ func (s *SampleBuilder) Pop() *media.Sample {
 	return result
 }
 
-// PopWithTimestamp compiles pushed RTP packets into media samples and then
-// returns the next valid sample with its associated RTP timestamp (or nil, 0 if
-// no sample is compiled).
-func (s *SampleBuilder) PopWithTimestamp() (*media.Sample, uint32) {
-	sample := s.Pop()
-	if sample == nil {
-		return nil, 0
-	}
-	return sample, sample.PacketTimestamp
-}
-
 // seqnumDistance computes the distance between two sequence numbers
 func seqnumDistance(x, y uint16) uint16 {
 	diff := int16(x - y)

pkg/media/samplebuilder/samplebuilder_test.go

@@ -465,15 +465,6 @@ func TestSampleBuilderWithPacketHeadHandler(t *testing.T) {
 	assert.Equal(t, 2, headCount, "two sample heads should have been inspected")
 }
 
-func TestPopWithTimestamp(t *testing.T) {
-	t.Run("Crash on nil", func(t *testing.T) {
-		s := New(0, &fakeDepacketizer{}, 1)
-		sample, timestamp := s.PopWithTimestamp()
-		assert.Nil(t, sample)
-		assert.Equal(t, uint32(0), timestamp)
-	})
-}
-
 type truePartitionHeadChecker struct{}
 
 func (f *truePartitionHeadChecker) IsPartitionHead([]byte) bool {
@@ -495,11 +486,11 @@ func TestSampleBuilderData(t *testing.T) {
 		}
 		s.Push(&p)
 		for {
-			sample, ts := s.PopWithTimestamp()
+			sample := s.Pop()
 			if sample == nil {
 				break
 			}
-			assert.Equal(t, ts, uint32(j+42), "timestamp")
+			assert.Equal(t, sample.PacketTimestamp, uint32(j+42), "timestamp")
 			assert.Equal(t, len(sample.Data), 1, "data length")
 			assert.Equal(t, byte(j), sample.Data[0], "data")
 			j++