add extra methods to cc

codec_context.go

@@ -28,6 +28,7 @@ static inline void astiavResetCodecContextGetFormat(AVCodecContext *ctx)
 */
 import "C"
 import (
+	"fmt"
 	"sync"
 	"unsafe"
 )
@@ -208,6 +209,37 @@ func (cc *CodecContext) SetSampleAspectRatio(r Rational) {
 	cc.c.sample_aspect_ratio = r.c
 }
 
+func (cc *CodecContext) ExtraData() []byte {
+	return bytesFromC(func(size *C.size_t) *C.uint8_t {
+		if cc.c.extradata == nil {
+			*size = C.size_t(0)
+			return nil
+		}
+		*size = C.size_t(cc.c.extradata_size)
+		return cc.c.extradata
+	})
+}
+
+func (cc *CodecContext) SetExtraData(extraData []byte) error {
+	if len(extraData) == 0 {
+		return nil
+	}
+
+	if cc.c.extradata != nil {
+		C.av_freep(unsafe.Pointer(&cc.c.extradata))
+		cc.c.extradata_size = 0
+	}
+
+	extradataSize := len(extraData)
+	if cc.c.extradata = (*C.uint8_t)(C.av_mallocz(C.size_t(extradataSize + C.AV_INPUT_BUFFER_PADDING_SIZE))); cc.c.extradata == nil {
+		return fmt.Errorf("astiav: allocation is nil")
+	}
+
+	C.memcpy(unsafe.Pointer(cc.c.extradata), unsafe.Pointer(&extraData[0]), C.size_t(extradataSize))
+	cc.c.extradata_size = C.int(extradataSize)
+	return nil
+}
+
 func (cc *CodecContext) SampleFormat() SampleFormat {
 	return SampleFormat(cc.c.sample_fmt)
 }

codec_context_test.go

@@ -132,6 +132,12 @@ func TestCodecContext(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, 2, cp1.Channels())
 
+	cc6 := AllocCodecContext(nil)
+	require.NotNil(t, cc5)
+	extraBytes := []byte{0, 0, 0, 1}
+	require.NoError(t, cc6.SetExtraData(extraBytes))
+	require.Equal(t, extraBytes, cc6.ExtraData())
+
 	// TODO Test ReceivePacket
 	// TODO Test SendPacket
 	// TODO Test ReceiveFrame