AndreasBriese / codec

Golang libav codec bindings (h264,aac)

codec

Golang aac/h264 encoder and decoder.

H264 encoding example:

w := 400
h := 400
var nal [][]byte 

c, _ := codec.NewH264Encoder(w, h, image.YCbCrSubsampleRatio420)
nal = append(nal, c.Header)

for i := 0; i < 60; i++ {
	img := image.NewYCbCr(image.Rect(0,0,w,h), image.YCbCrSubsampleRatio420)
	p, _ := c.Encode(img)
	if len(p.Data) > 0 {
		nal = append(nal, p.Data)
	}
}
for {
	// flush encoder
	p, err := c.Encode(nil)
	if err != nil {
		break
	}
	nal = append(nal, p.Data)
}

H264 decoding example:

dec, err := codec.NewH264Decoder(nal[0])
for i, n := range nal[1:] {
	img, err := dec.Decode(n)
	if err == nil {
		fp, _ := os.Create(fmt.Sprintf("/tmp/dec-%d.jpg", i))
		jpeg.Encode(fp, img, nil)
		fp.Close()
	}
}

AAC encoding example:

var pkts [][]byte 

c, _ := codec.NewAACEncoder()
pkts = append(pkts, c.Header)

for i := 0; i < 60; i++ {
	var sample [8192]byte
	p, _ := c.Encode(sample)
	if len(p) > 0 {
		pkts = append(pkts, p)
	}
}

AAC decoding example:

dec, _ := codec.NewAACDecoder(pkts[0])
for _, p := range pkts[1:] {
	sample, err := dec.Decode(p)
}