Because files services have unique characteristics, the architecture of MMIO is stand-alone and separate from the notion of the media control interface, although some media drivers and file system stream handlers still require file services from MMIO.
When an application calls multimedia I/O functions, the MMIO Manager calls the appropriate I/O procedure (IOProc) if necessary, or processes the function within the MMIO Manager itself. The MMIO Manager uses IOProcs to direct the input and output associated with reading from and writing to different types of storage systems or file formats. IOProcs provide an abstract of the file format, allowing operations such as read, write, and seek to be independent of the specific format in use. The handler is responsible for translating a generic application request into the necessary format-specific operations.
The MMIO architecture provides for CODEC procedures to operate on data objects as required. A given file format I/O procedure might support none, one, or many CODEC procedures operating on a single format.
The following figure illustrates the architecture of the MMIO subsystem.
旼컴컴컴컴컴커 旼컴컴컴컴컴커 旼컴컴컴컴컴커
� � � MEDIA � � STREAM �
쿌PPLICATIONS� � DRIVERS � � HANDLER �
읕컴컴쩡컴컴켸 읕컴컴쩡컴컴켸 읕컴컴쩡컴컴켸
� � �
읕컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴�
旼컴컴컴컴컴컴컴컴컴컴컴컴컴�
� MMIO MANAGER �
읕컴컴컴컴컴컴쩡컴컴컴컴컴컴�
旼컴컴컴컴컴컴컴컴컴커 � 旼컴컴컴컴컴컴컴컴컴커
쿑ile Format IOProcs � � 쿑ile Format IOProcs �
� 旼컴컴컴컴컴컴컴� � � � 旼컴컴컴컴컴컴컴� �
� � WAVE � � � � � AVC image � �
� 쳐컴컴컴컴컴컴컴� � � � 쳐컴컴컴컴컴컴컴� �
� � CLI VOC � � � � 쿘-Motion image � �
� 쳐컴컴컴컴컴컴컴� 쳐컴컴탠컴캑 쳐컴컴컴컴컴컴컴� �
� � AVC audio � � � � �1.3 & 2.0 BMP � �
� 쳐컴컴컴컴컴컴컴� � � � 쳐컴컴컴컴컴컴컴� �
� � RMID & MID � � � � � RDIB & DIB � �
� 쳐컴컴컴컴컴컴컴� � � � 읕컴컴컴컴컴컴컴� �
� � AVI � � � � . �
� 읕컴컴컴컴컴컴컴� � � � . �
� � � � . �
읕컴컴컴컴컴컴컴컴컴켸 � 읕컴컴컴컴컴컴컴컴컴켸
�
旼컴컴컴컴컴컴컴컴컴� � 旼컴컴컴컴컴컴컴컴컴�
� Codec Procedures 쳐컴컴컵컴컴캑 Codec Procedures �
� 旼컴컴컴컴컴컴컴� � � � 旼컴컴컴컴컴컴컴� �
� � Ultimotion � � � � � Others � �
� 읕컴컴컴컴컴컴컴� � � � 읕컴컴컴컴컴컴컴� �
읕컴컴컴컴컴컴컴컴컴� � 읕컴컴컴컴컴컴컴컴컴�
- - - - - - - - - - - - - - - - - � - - - - - - - - - - - - - - -
旼컴컴컴컴컴컫컴컴컨컴컴쩡컴컴컴컴컴�
旼컴컴컴컴커旼컴컴컴컴커旼컴컴컴컴커旼컴컴컴컴커
System � DOS 납 MEMORY 납 COMPOUND 납 OTHERS �
Storage � FILE 납 FILE 납 FILE 납 �
IOProcs 읕컴컫컴컴켸읕컴컴컴컴켸읕컴컫컴컴켸읕컴컴쩡컴켸
� � � Ring 3
- - - - - - - -�- - - - - - - - - - - -�- - - - - - �- - - - - - -
Ring 0
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� File System �
읕컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴�