Now compatible with n6.1.1

packet_side_data.go

@@ -0,0 +1,50 @@
+package astiav
+
+//#cgo pkg-config: libavcodec
+//#include <libavcodec/avcodec.h>
+import "C"
+import (
+	"errors"
+	"unsafe"
+)
+
+// https://github.com/FFmpeg/FFmpeg/blob/n6.1.1/libavcodec/packet.h#L342
+type PacketSideData struct {
+	sd   **C.struct_AVPacketSideData
+	size *C.int
+}
+
+func newPacketSideDataFromC(sd **C.struct_AVPacketSideData, size *C.int) *PacketSideData {
+	return &PacketSideData{
+		sd:   sd,
+		size: size,
+	}
+}
+
+func (d *PacketSideData) Add(t PacketSideDataType, b []byte) error {
+	if len(b) == 0 {
+		return nil
+	}
+
+	sd := C.av_packet_side_data_new(d.sd, d.size, (C.enum_AVPacketSideDataType)(t), C.size_t(len(b)), 0)
+	if sd == nil {
+		return errors.New("astiav: nil pointer")
+	}
+
+	C.memcpy(unsafe.Pointer(sd.data), unsafe.Pointer(&b[0]), C.size_t(len(b)))
+	return nil
+}
+
+func (d *PacketSideData) Get(t PacketSideDataType) []byte {
+	return bytesFromC(func(size *C.size_t) *C.uint8_t {
+		if d.sd == nil || d.size == nil {
+			return nil
+		}
+		sd := C.av_packet_side_data_get(*d.sd, *d.size, (C.enum_AVPacketSideDataType)(t))
+		if sd == nil {
+			return nil
+		}
+		*size = sd.size
+		return sd.data
+	})
+}