Added Program

program.go

@@ -0,0 +1,53 @@
+package astiav
+
+//#cgo pkg-config: libavformat
+//#include <libavformat/avformat.h>
+import "C"
+import (
+	"unsafe"
+)
+
+// https://github.com/FFmpeg/FFmpeg/blob/n7.0/libavformat/avformat.h#L1181
+type Program struct {
+	c  *C.struct_AVProgram
+	fc *FormatContext
+}
+
+func newProgramFromC(c *C.struct_AVProgram, fc *FormatContext) *Program {
+	if c == nil {
+		return nil
+	}
+	return &Program{
+		c:  c,
+		fc: fc,
+	}
+}
+
+func (p *Program) AddStream(s *Stream) {
+	C.av_program_add_stream_index(p.fc.c, p.c.id, C.uint(s.c.index))
+}
+
+func (p *Program) ID() int {
+	return int(p.c.id)
+}
+
+func (p *Program) NbStreams() int {
+	return int(p.c.nb_stream_indexes)
+}
+
+func (p *Program) SetID(i int) {
+	p.c.id = C.int(i)
+}
+
+func (p *Program) Streams() (ss []*Stream) {
+	is := make(map[int]bool)
+	for _, idx := range unsafe.Slice(p.c.stream_index, p.c.nb_stream_indexes) {
+		is[int(idx)] = true
+	}
+	for _, s := range p.fc.Streams() {
+		if _, ok := is[s.Index()]; ok {
+			ss = append(ss, s)
+		}
+	}
+	return
+}