merge format and formatdecenc into formats (#222)

pkg/formats/vorbis.go

@@ -0,0 +1,87 @@
+package formats
+
+import (
+	"encoding/base64"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/pion/rtp"
+)
+
+// Vorbis is a format that uses the Vorbis codec.
+type Vorbis struct {
+	PayloadTyp    uint8
+	SampleRate    int
+	ChannelCount  int
+	Configuration []byte
+}
+
+// String implements Format.
+func (t *Vorbis) String() string {
+	return "Vorbis"
+}
+
+// ClockRate implements Format.
+func (t *Vorbis) ClockRate() int {
+	return t.SampleRate
+}
+
+// PayloadType implements Format.
+func (t *Vorbis) PayloadType() uint8 {
+	return t.PayloadTyp
+}
+
+func (t *Vorbis) unmarshal(payloadType uint8, clock string, codec string, rtpmap string, fmtp map[string]string) error {
+	t.PayloadTyp = payloadType
+
+	tmp := strings.SplitN(clock, "/", 2)
+	if len(tmp) != 2 {
+		return fmt.Errorf("invalid clock (%v)", clock)
+	}
+
+	sampleRate, err := strconv.ParseInt(tmp[0], 10, 64)
+	if err != nil {
+		return err
+	}
+	t.SampleRate = int(sampleRate)
+
+	channelCount, err := strconv.ParseInt(tmp[1], 10, 64)
+	if err != nil {
+		return err
+	}
+	t.ChannelCount = int(channelCount)
+
+	for key, val := range fmtp {
+		if key == "configuration" {
+			conf, err := base64.StdEncoding.DecodeString(val)
+			if err != nil {
+				return fmt.Errorf("invalid AAC config (%v)", val)
+			}
+
+			t.Configuration = conf
+		}
+	}
+
+	if t.Configuration == nil {
+		return fmt.Errorf("config is missing")
+	}
+
+	return nil
+}
+
+// Marshal implements Format.
+func (t *Vorbis) Marshal() (string, map[string]string) {
+	fmtp := map[string]string{
+		"configuration": base64.StdEncoding.EncodeToString(t.Configuration),
+	}
+
+	return "VORBIS/" + strconv.FormatInt(int64(t.SampleRate), 10) +
+			"/" + strconv.FormatInt(int64(t.ChannelCount), 10),
+		fmtp
+}
+
+// PTSEqualsDTS implements Format.
+func (t *Vorbis) PTSEqualsDTS(*rtp.Packet) bool {
+	return true
+}