readers: return an empty frame when there is nothing to decode

Clement Champetier · Clement Champetier · commit 1a635be9c06a · 2015-12-02T11:39:09.000+01:00
EOF or error in the decoding process.
diff --git a/src/AvTranscoder/reader/IReader.cpp b/src/AvTranscoder/reader/IReader.cpp
@@ -64,13 +64,18 @@ Frame* IReader::readFrameAt( const size_t frame )
 	}
 	_currentFrame = frame;
 	// decode
+	bool decodingStatus = false;
 	if( _channelIndex != -1 )
-		_decoder->decodeNextFrame( *_srcFrame, _channelIndex );
+		decodingStatus = _decoder->decodeNextFrame( *_srcFrame, _channelIndex );
 	else
-		_decoder->decodeNextFrame( *_srcFrame );
+		decodingStatus = _decoder->decodeNextFrame( *_srcFrame );
+	if( ! decodingStatus )
+	{
+		_dstFrame->clear();
+		return _dstFrame;
+	}
 	// transform
 	_transform->convert( *_srcFrame, *_dstFrame );
-	// return buffer
 	return _dstFrame;
 }
 
