FormatContext: print error message if unable to open file

Clement Champetier · Clement Champetier · commit 34b89c09f728 · 2015-01-13T15:35:45.000+01:00
diff --git a/src/AvTranscoder/file/FormatContext.cpp b/src/AvTranscoder/file/FormatContext.cpp
@@ -14,11 +14,15 @@ FormatContext::FormatContext( const std::string& filename, int req_flags )
 {
 	av_register_all();  // TODO: call it once
 
-	int err = avformat_open_input( &_avFormatContext, filename.c_str(), NULL, NULL );
-	if( err < 0 )
+	int ret = avformat_open_input( &_avFormatContext, filename.c_str(), NULL, NULL );
+	if( ret < 0 )
 	{
-		std::string msg = "unable to open file: ";
+		char err[AV_ERROR_MAX_STRING_SIZE];
+		av_strerror( ret, err, sizeof(err) );
+		std::string msg = "unable to open file ";
 		msg += filename;
+		msg += ": ";
+		msg += err;
 		throw std::ios_base::failure( msg );
 	}
 	loadOptions( _options, _avFormatContext, req_flags );

Original file line number	Diff line number	Diff line change
`@@ -14,11 +14,15 @@ FormatContext::FormatContext( const std::string& filename, int req_flags )`
`14`	`14`	`{`
`15`	`15`	`av_register_all(); // TODO: call it once`
`16`	`16`
`17`		`- int err = avformat_open_input( &_avFormatContext, filename.c_str(), NULL, NULL );`
`18`		`- if( err < 0 )`
	`17`	`+ int ret = avformat_open_input( &_avFormatContext, filename.c_str(), NULL, NULL );`
	`18`	`+ if( ret < 0 )`
`19`	`19`	`{`
`20`		`- std::string msg = "unable to open file: ";`
	`20`	`+ char err[AV_ERROR_MAX_STRING_SIZE];`
	`21`	`+ av_strerror( ret, err, sizeof(err) );`
	`22`	`+ std::string msg = "unable to open file ";`
`21`	`23`	`msg += filename;`
	`24`	`+ msg += ": ";`
	`25`	`+ msg += err;`
`22`	`26`	`throw std::ios_base::failure( msg );`
`23`	`27`	`}`
`24`	`28`	`loadOptions( _options, _avFormatContext, req_flags );`