first commit

codec/codec.go

@@ -0,0 +1,64 @@
+package codec
+
+import (
+	"time"
+
+	"github.com/deepch/vdk/av"
+	"github.com/deepch/vdk/codec/fake"
+)
+
+type PCMUCodecData struct {
+	typ av.CodecType
+}
+
+func (self PCMUCodecData) Type() av.CodecType {
+	return self.typ
+}
+
+func (self PCMUCodecData) SampleRate() int {
+	return 8000
+}
+
+func (self PCMUCodecData) ChannelLayout() av.ChannelLayout {
+	return av.CH_MONO
+}
+
+func (self PCMUCodecData) SampleFormat() av.SampleFormat {
+	return av.S16
+}
+
+func (self PCMUCodecData) PacketDuration(data []byte) (time.Duration, error) {
+	return time.Duration(len(data)) * time.Second / time.Duration(8000), nil
+}
+
+func NewPCMMulawCodecData() av.AudioCodecData {
+	return PCMUCodecData{
+		typ: av.PCM_MULAW,
+	}
+}
+
+func NewPCMAlawCodecData() av.AudioCodecData {
+	return PCMUCodecData{
+		typ: av.PCM_ALAW,
+	}
+}
+
+type SpeexCodecData struct {
+	fake.CodecData
+}
+
+func (self SpeexCodecData) PacketDuration(data []byte) (time.Duration, error) {
+	// libavcodec/libspeexdec.c
+	// samples = samplerate/50
+	// duration = 0.02s
+	return time.Millisecond * 20, nil
+}
+
+func NewSpeexCodecData(sr int, cl av.ChannelLayout) SpeexCodecData {
+	codec := SpeexCodecData{}
+	codec.CodecType_ = av.SPEEX
+	codec.SampleFormat_ = av.S16
+	codec.SampleRate_ = sr
+	codec.ChannelLayout_ = cl
+	return codec
+}