Added format/codec context private data + options

codec_context.go

@@ -210,6 +210,11 @@ func (cc *CodecContext) SetPixelFormat(pixFmt PixelFormat) {
 	cc.c.pix_fmt = C.enum_AVPixelFormat(pixFmt)
 }
 
+// https://ffmpeg.org/doxygen/7.0/structAVCodecContext.html#af3379123060ad8cc9c321c29af4f8360
+func (cc *CodecContext) PrivateData() *PrivateData {
+	return newPrivateDataFromC(cc.c.priv_data)
+}
+
 // https://ffmpeg.org/doxygen/7.0/structAVCodecContext.html#a7abe7095de73df98df4895bf9e25fc6b
 func (cc *CodecContext) Profile() Profile {
 	return Profile(cc.c.profile)

codec_context_test.go

@@ -35,6 +35,7 @@ func TestCodecContext(t *testing.T) {
 	require.Equal(t, Level(13), cc1.Level())
 	require.Equal(t, MediaTypeVideo, cc1.MediaType())
 	require.Equal(t, PixelFormatYuv420P, cc1.PixelFormat())
+	require.NotNil(t, cc1.PrivateData())
 	require.Equal(t, ProfileH264ConstrainedBaseline, cc1.Profile())
 	require.Equal(t, NewRational(1, 1), cc1.SampleAspectRatio())
 	require.Equal(t, StrictStdComplianceNormal, cc1.StrictStdCompliance())

format_context.go

@@ -186,6 +186,11 @@ func (fc *FormatContext) SetPb(i *IOContext) {
 	fc.c.pb = i.c
 }
 
+// https://ffmpeg.org/doxygen/7.0/structAVFormatContext.html#ac4c0777e54085af2f3f1b27130e2b21b
+func (fc *FormatContext) PrivateData() *PrivateData {
+	return newPrivateDataFromC(fc.c.priv_data)
+}
+
 // https://ffmpeg.org/doxygen/7.0/structAVFormatContext.html#a2590129e00adfa726ab2033a10e905e9
 func (fc *FormatContext) StartTime() int64 {
 	return int64(fc.c.start_time)

format_context_test.go

@@ -24,6 +24,7 @@ func TestFormatContext(t *testing.T) {
 	require.Equal(t, IOContextFlags(0), fc1.IOFlags())
 	require.Equal(t, int64(0), fc1.MaxAnalyzeDuration())
 	require.Equal(t, "isom", fc1.Metadata().Get("major_brand", nil, NewDictionaryFlags()).Value())
+	require.NotNil(t, fc1.PrivateData())
 	require.Equal(t, int64(0), fc1.StartTime())
 	require.Equal(t, 2, fc1.NbStreams())
 	require.Len(t, fc1.Streams(), 2)

internal/cmd/flags/main.go

@@ -26,6 +26,7 @@ var list = []listItem{
 	{Name: "FormatEvent"},
 	{Name: "IOContext"},
 	{Name: "IOFormat"},
+	{Name: "OptionSearch"},
 	{Name: "Packet"},
 	{Name: "Seek"},
 	{Name: "SoftwareScaleContext"},

option.c

@@ -0,0 +1,12 @@
+#include <libavutil/opt.h>
+
+int astiavOptionGet(void *obj, const char *name, const char **value, int flags)
+{
+    uint8_t *v = NULL;
+    int ret = av_opt_get(obj, name, flags, &v);
+    if (ret < 0) {
+        return ret;
+    }
+    *value = (const char *)v;
+    return 0;
+}

option.go

@@ -0,0 +1,60 @@
+package astiav
+
+//#include <libavutil/opt.h>
+//#include "option.h"
+import "C"
+import (
+	"unsafe"
+)
+
+type Options struct {
+	c unsafe.Pointer
+}
+
+func newOptionsFromC(c unsafe.Pointer) *Options {
+	if c == nil {
+		return nil
+	}
+	return &Options{c: c}
+}
+
+type Option struct {
+	Name string
+}
+
+// https://www.ffmpeg.org/doxygen/7.0/group__opt__mng.html#gabc75970cd87d1bf47a4ff449470e9225
+func (os *Options) List() (list []Option) {
+	var prev *C.AVOption
+	for {
+		o := C.av_opt_next(os.c, prev)
+		if o == nil {
+			return
+		}
+		list = append(list, Option{Name: C.GoString(o.name)})
+		prev = o
+	}
+}
+
+// https://www.ffmpeg.org/doxygen/7.0/group__opt__set__funcs.html#ga5fd4b92bdf4f392a2847f711676a7537
+func (os *Options) Set(name, value string, f OptionSearchFlags) error {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+	cvalue := C.CString(value)
+	defer C.free(unsafe.Pointer(cvalue))
+	return newError(C.av_opt_set(os.c, cname, cvalue, C.int(f)))
+}
+
+// https://www.ffmpeg.org/doxygen/7.0/group__opt__get__funcs.html#gaf31144e60f9ce89dbe8cbea57a0b232c
+func (os *Options) Get(name string, f OptionSearchFlags) (string, error) {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+	var cvalue *C.char = nil
+	if err := newError(C.astiavOptionGet(os.c, cname, &cvalue, C.int(f))); err != nil {
+		return "", err
+	}
+	if cvalue == nil {
+		return "", nil
+	}
+	defer C.av_freep(unsafe.Pointer(&cvalue))
+	return C.GoString(cvalue), nil
+}

option.h

@@ -0,0 +1 @@
+int astiavOptionGet(void *obj, const char *name, const char **value, int flags);

option_search_flag.go

@@ -0,0 +1,12 @@
+package astiav
+
+//#include <libavutil/opt.h>
+import "C"
+
+// https://ffmpeg.org/doxygen/7.0/group__opt__mng.html#ga25801ba4fc9b5313eb33ec84e082dd72
+type OptionSearchFlag int64
+
+const (
+	OptionSearchFlagChildren   = CodecContextFlag(C.AV_OPT_SEARCH_CHILDREN)
+	OptionSearchFlagFakeObject = CodecContextFlag(C.AV_OPT_SEARCH_FAKE_OBJ)
+)

option_test.go

@@ -0,0 +1,28 @@
+package astiav
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestOption(t *testing.T) {
+	fc, err := AllocOutputFormatContext(nil, "mp4", "")
+	require.NoError(t, err)
+	pd := fc.PrivateData()
+	require.NotNil(t, pd)
+	os := pd.Options()
+	require.NotNil(t, os)
+	require.Equal(t, []Option{{Name: "brand"}, {Name: "empty_hdlr_name"}, {Name: "encryption_key"}, {Name: "encryption_kid"}, {Name: "encryption_scheme"}, {Name: "frag_duration"}, {Name: "frag_interleave"}, {Name: "frag_size"}, {Name: "fragment_index"}, {Name: "iods_audio_profile"}, {Name: "iods_video_profile"}, {Name: "ism_lookahead"}, {Name: "movflags"}, {Name: "cmaf"}, {Name: "dash"}, {Name: "default_base_moof"}, {Name: "delay_moov"}, {Name: "disable_chpl"}, {Name: "empty_moov"}, {Name: "faststart"}, {Name: "frag_custom"}, {Name: "frag_discont"}, {Name: "frag_every_frame"}, {Name: "frag_keyframe"}, {Name: "global_sidx"}, {Name: "isml"}, {Name: "moov_size"}, {Name: "negative_cts_offsets"}, {Name: "omit_tfhd_offset"}, {Name: "prefer_icc"}, {Name: "rtphint"}, {Name: "separate_moof"}, {Name: "skip_sidx"}, {Name: "skip_trailer"}, {Name: "use_metadata_tags"}, {Name: "write_colr"}, {Name: "write_gama"}, {Name: "min_frag_duration"}, {Name: "mov_gamma"}, {Name: "movie_timescale"}, {Name: "rtpflags"}, {Name: "latm"}, {Name: "rfc2190"}, {Name: "skip_rtcp"}, {Name: "h264_mode0"}, {Name: "send_bye"}, {Name: "skip_iods"}, {Name: "use_editlist"}, {Name: "use_stream_ids_as_track_ids"}, {Name: "video_track_timescale"}, {Name: "write_btrt"}, {Name: "write_prft"}, {Name: "pts"}, {Name: "wallclock"}, {Name: "write_tmcd"}}, os.List())
+	_, err = os.Get("invalid", NewOptionSearchFlags())
+	require.Error(t, err)
+	v, err := os.Get("brand", NewOptionSearchFlags())
+	require.NoError(t, err)
+	require.Equal(t, "", v)
+	require.Error(t, os.Set("invalid", "", NewOptionSearchFlags()))
+	const brand = "test"
+	require.NoError(t, os.Set("brand", brand, NewOptionSearchFlags()))
+	v, err = os.Get("brand", NewOptionSearchFlags())
+	require.NoError(t, err)
+	require.Equal(t, brand, v)
+}

private_data.go

@@ -0,0 +1,18 @@
+package astiav
+
+import "unsafe"
+
+type PrivateData struct {
+	c unsafe.Pointer
+}
+
+func newPrivateDataFromC(c unsafe.Pointer) *PrivateData {
+	if c == nil {
+		return nil
+	}
+	return &PrivateData{c: c}
+}
+
+func (pd *PrivateData) Options() *Options {
+	return newOptionsFromC(pd.c)
+}