max_b_frame and control bit_rate (#121)

* OpenIOContextWithDictionary

* OpenIOContext

* OpenIOContext

* IOInterrupterCB

* OpenIOContext(filename string, flags IOContextFlags, ii *IOInterrupter, d *Dictionary)

* Program and Discard

* Program and Discard

* Program and Discard

* Program and Discard

* Program and Discard

* Program and Discard

* CodecContext
MaxBFrames()
SetMaxBFrames(n int)

* another pr

* delete Flags()

* delete Flags()

* delete Flags()

* delete PmtVersion()

* SetStreamIndex

* SetStreamIndex

* MaxBFrames()
SetMaxBFrames(n int)
RcMaxRate()
SetRcMaxRate(n int64)
RcMinRate()
SetRcMinRate(n int64)
RcBufferSize()
SetRcBufferSize(n int)

* rename rate control methods

* test passed

codec_context.go

@@ -455,3 +455,43 @@ func goAstiavCodecContextGetFormat(cc *C.AVCodecContext, pfsCPtr *C.enum_AVPixel
 	// Callback
 	return C.enum_AVPixelFormat(c(pfs))
 }
+
+// https://ffmpeg.org/doxygen/7.0/structAVCodecContext.html#a3e5334a611a3e2a6a653805bb9e2d4d4
+func (cc *CodecContext) MaxBFrames() int {
+	return int(cc.c.max_b_frames)
+}
+
+// https://ffmpeg.org/doxygen/7.0/structAVCodecContext.html#a3e5334a611a3e2a6a653805bb9e2d4d4
+func (cc *CodecContext) SetMaxBFrames(n int) {
+	cc.c.max_b_frames = C.int(n)
+}
+
+// https://ffmpeg.org/doxygen/7.0/structAVCodecContext.html#aa2b5582f1a360534310b686cc3f7c668
+func (cc *CodecContext) RateControlMaxRate() int64 {
+	return int64(cc.c.rc_max_rate)
+}
+
+// https://ffmpeg.org/doxygen/7.0/structAVCodecContext.html#aa2b5582f1a360534310b686cc3f7c668
+func (cc *CodecContext) SetRateControlMaxRate(n int64) {
+	cc.c.rc_max_rate = C.int64_t(n)
+}
+
+// https://ffmpeg.org/doxygen/7.0/structAVCodecContext.html#ac265c70b89e87455ec05eb2978def81b
+func (cc *CodecContext) RateControlMinRate() int64 {
+	return int64(cc.c.rc_min_rate)
+}
+
+// https://ffmpeg.org/doxygen/7.0/structAVCodecContext.html#ac265c70b89e87455ec05eb2978def81b
+func (cc *CodecContext) SetRateControlMinRate(n int64) {
+	cc.c.rc_min_rate = C.int64_t(n)
+}
+
+// https://ffmpeg.org/doxygen/7.0/structAVCodecContext.html#a15000607a7e2371162348bb35b0184c1
+func (cc *CodecContext) RateControlBufferSize() int {
+	return int(cc.c.rc_buffer_size)
+}
+
+// https://ffmpeg.org/doxygen/7.0/structAVCodecContext.html#a15000607a7e2371162348bb35b0184c1
+func (cc *CodecContext) SetRateControlBufferSize(n int) {
+	cc.c.rc_buffer_size = C.int(n)
+}

codec_context_test.go

@@ -101,6 +101,10 @@ func TestCodecContext(t *testing.T) {
 	cc4.SetTimeBase(NewRational(15, 1))
 	cc4.SetWidth(16)
 	cc4.SetExtraHardwareFrames(4)
+	cc4.SetMaxBFrames(1)
+	cc4.SetRateControlMaxRate(1_500_000)
+	cc4.SetRateControlMinRate(1_500_000)
+	cc4.SetRateControlBufferSize(1_500_000)
 	require.Equal(t, int64(1), cc4.BitRate())
 	require.True(t, cc4.ChannelLayout().Equal(ChannelLayout21))
 	require.Equal(t, NewCodecContextFlags(4), cc4.Flags())
@@ -121,6 +125,10 @@ func TestCodecContext(t *testing.T) {
 	require.Equal(t, NewRational(15, 1), cc4.TimeBase())
 	require.Equal(t, 16, cc4.Width())
 	require.Equal(t, 4, cc4.ExtraHardwareFrames())
+	require.Equal(t, 1, cc4.MaxBFrames())
+	require.Equal(t, int64(1_500_000), cc4.RateControlMaxRate())
+	require.Equal(t, int64(1_500_000), cc4.RateControlMinRate())
+	require.Equal(t, 1_500_000, cc4.RateControlBufferSize())
 
 	cc5 := AllocCodecContext(nil)
 	require.NotNil(t, cc5)