Enhance Codec Iteration and Checking of HardwareConfigMethodFlags (#40)

* Add IterateCodecs, Add codec.HasHardwareConfigMethodFlag

* Remove HasHardwareConfigMethodFlag test because git worklow does not support hw

HasHardwareConfigMethodFlag is tested on my local device but does not work in git

* Review Changes

Remove unused arg in HardwareConfigs
Add mehtod to get all codecs
Update test

* Remove codecporcessor type

codec.go

@@ -28,6 +28,10 @@ func (c *Codec) String() string {
 	return c.Name()
 }
 
+func (c *Codec) ID() CodecID {
+	return CodecID(c.c.id)
+}
+
 func (c *Codec) ChannelLayouts() (o []ChannelLayout) {
 	if c.c.ch_layouts == nil {
 		return nil
@@ -101,7 +105,7 @@ func FindEncoderByName(n string) *Codec {
 	return newCodecFromC(C.avcodec_find_encoder_by_name(cn))
 }
 
-func (c *Codec) HardwareConfigs(dt HardwareDeviceType) (configs []CodecHardwareConfig) {
+func (c *Codec) HardwareConfigs() (configs []CodecHardwareConfig) {
 	var i int
 	for {
 		config := C.avcodec_get_hw_config(c.c, C.int(i))
@@ -113,3 +117,18 @@ func (c *Codec) HardwareConfigs(dt HardwareDeviceType) (configs []CodecHardwareC
 	}
 	return
 }
+
+func Codecs() []*Codec {
+	var opq *C.void = nil
+	var codecs []*Codec
+	for {
+		c := C.av_codec_iterate((*unsafe.Pointer)(unsafe.Pointer(&opq)))
+		if c == nil {
+			break
+		}
+
+		codec := newCodecFromC(c)
+		codecs = append(codecs, codec)
+	}
+	return codecs
+}

codec_test.go

@@ -10,6 +10,7 @@ import (
 func TestCodec(t *testing.T) {
 	c := astiav.FindDecoder(astiav.CodecIDMp3)
 	require.NotNil(t, c)
+	require.Equal(t, c.ID(), astiav.CodecIDMp3)
 	require.Nil(t, c.ChannelLayouts())
 	require.True(t, c.IsDecoder())
 	require.False(t, c.IsEncoder())
@@ -66,4 +67,12 @@ func TestCodec(t *testing.T) {
 
 	c = astiav.FindDecoderByName("invalid")
 	require.Nil(t, c)
+
+	var found bool
+	for _, c := range astiav.Codecs() {
+		if c.ID() == astiav.CodecIDMjpeg {
+			found = true
+		}
+	}
+	require.True(t, found)
 }

examples/hardware_decoding/main.go

@@ -107,7 +107,7 @@ func main() {
 		defer s.decCodecContext.Free()
 
 		// Loop through codec hardware configs
-		for _, p := range s.decCodec.HardwareConfigs(hardwareDeviceType) {
+		for _, p := range s.decCodec.HardwareConfigs() {
 			// Valid hardware config
 			if p.MethodFlags().Has(astiav.CodecHardwareConfigMethodFlagHwDeviceCtx) && p.HardwareDeviceType() == hardwareDeviceType {
 				s.hardwarePixelFormat = p.PixelFormat()