first commit

cgo/ffmpeg/ffmpeg.go

@@ -0,0 +1,74 @@
+package ffmpeg
+
+/*
+#cgo LDFLAGS: -lavformat -lavutil -lavcodec -lavresample -lswscale
+#include "ffmpeg.h"
+void ffinit() {
+	av_register_all();
+}
+*/
+import "C"
+import (
+	"runtime"
+	"unsafe"
+)
+
+const (
+	QUIET = int(C.AV_LOG_QUIET)
+	PANIC = int(C.AV_LOG_PANIC)
+	FATAL = int(C.AV_LOG_FATAL)
+	ERROR = int(C.AV_LOG_ERROR)
+	WARNING = int(C.AV_LOG_WARNING)
+	INFO = int(C.AV_LOG_INFO)
+	VERBOSE = int(C.AV_LOG_VERBOSE)
+	DEBUG = int(C.AV_LOG_DEBUG)
+	TRACE = int(C.AV_LOG_TRACE)
+)
+
+func HasEncoder(name string) bool {
+	return C.avcodec_find_encoder_by_name(C.CString(name)) != nil
+}
+
+func HasDecoder(name string) bool {
+	return C.avcodec_find_decoder_by_name(C.CString(name)) != nil
+}
+
+//func EncodersList() []string
+//func DecodersList() []string
+
+func SetLogLevel(level int) {
+	C.av_log_set_level(C.int(level))
+}
+
+func init() {
+	C.ffinit()
+}
+
+type ffctx struct {
+	ff C.FFCtx
+}
+
+func newFFCtxByCodec(codec *C.AVCodec) (ff *ffctx, err error) {
+	ff = &ffctx{}
+	ff.ff.codec = codec
+	ff.ff.codecCtx = C.avcodec_alloc_context3(codec)
+	ff.ff.profile = C.FF_PROFILE_UNKNOWN
+	runtime.SetFinalizer(ff, freeFFCtx)
+	return
+}
+
+func freeFFCtx(self *ffctx) {
+	ff := &self.ff
+	if ff.frame != nil {
+		C.av_frame_free(&ff.frame)
+	}
+	if ff.codecCtx != nil {
+		C.avcodec_close(ff.codecCtx)
+		C.av_free(unsafe.Pointer(ff.codecCtx))
+		ff.codecCtx = nil
+	}
+	if ff.options != nil {
+		C.av_dict_free(&ff.options)
+	}
+}
+