Merge branch 'github-master'

ffmpeg/callback.go

@@ -0,0 +1,56 @@
+package ffmpeg
+
+// #include "ffmpeg.h"
+import "C"
+import (
+	"io"
+	"reflect"
+	"unsafe"
+
+	"github.com/cshum/vipsgen/pointer"
+)
+
+//export goPacketRead
+func goPacketRead(opaque unsafe.Pointer, buffer *C.uint8_t, bufSize C.int) C.int {
+	ctx, ok := pointer.Restore(opaque).(*AVContext)
+	if !ok || ctx.reader == nil {
+		return C.int(ErrUnknown)
+	}
+	size := int(bufSize)
+	sh := &reflect.SliceHeader{
+		Data: uintptr(unsafe.Pointer(buffer)),
+		Len:  size,
+		Cap:  size,
+	}
+	buf := *(*[]byte)(unsafe.Pointer(sh))
+	n, err := ctx.reader.Read(buf)
+	if err == io.EOF {
+		if n == 0 {
+			return C.int(ErrEOF)
+		}
+	} else if err != nil {
+		return C.int(ErrUnknown)
+	}
+	return C.int(n)
+}
+
+//export goPacketSeek
+func goPacketSeek(opaque unsafe.Pointer, offset C.int64_t, whence C.int) C.int64_t {
+	ctx, ok := pointer.Restore(opaque).(*AVContext)
+	if !ok || ctx.seeker == nil {
+		return C.int64_t(ErrUnknown)
+	}
+	if whence == C.AVSEEK_SIZE {
+		return C.int64_t(ctx.size)
+	}
+	n, err := ctx.seeker.Seek(int64(offset), int(whence))
+	if err != nil {
+		return C.int64_t(ErrUnknown)
+	}
+	return C.int64_t(n)
+}
+
+//export goAVLoggingHandler
+func goAVLoggingHandler(level C.int, cstr *C.char) {
+	log(AVLogLevel(level), C.GoString(cstr))
+}