feat: imagorvideo init

ffmpeg/errors.go

@@ -0,0 +1,39 @@
+package ffmpeg
+
+// #include "ffmpeg.h"
+import "C"
+import (
+	"strconv"
+	"unsafe"
+)
+
+type avError int
+
+const (
+	ErrNoMem           = avError(-C.ENOMEM)
+	ErrEOF             = avError(C.AVERROR_EOF)
+	ErrUnknown         = avError(C.AVERROR_UNKNOWN)
+	ErrDecoderNotFound = avError(C.AVERROR_DECODER_NOT_FOUND)
+	ErrInvalidData     = avError(C.AVERROR_INVALIDDATA)
+	ErrTooBig          = avError(C.ERR_TOO_BIG)
+)
+
+func (e avError) errorString() string {
+	if e == ErrNoMem {
+		return "cannot allocate memory"
+	}
+	if e == ErrTooBig {
+		return "video or cover art size exceeds maximum allowed dimensions"
+	}
+	errString := (*C.char)(C.av_malloc(C.AV_ERROR_MAX_STRING_SIZE))
+	if errString == nil {
+		return "cannot allocate memory for error string, error code: " + strconv.Itoa(int(e))
+	}
+	defer C.av_free(unsafe.Pointer(errString))
+	C.av_make_error_string(errString, C.AV_ERROR_MAX_STRING_SIZE, C.int(e))
+	return C.GoString(errString)
+}
+
+func (e avError) Error() string {
+	return "ffmpeg: " + e.errorString()
+}