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Case Study

End-to-End solution for MP3 player

The client

A multi-billion Euro giant, who provides a wide range of technologies, finished products and services to consumers and professionals in the entertainment and media industries.

The challenge

Defining the software and hardware architecture was the major challenge in product engineering for a complex and evolving product like the Advanced Audio Player Solution that the client was looking at. With a wide range of technologies involved, it was imperative to leverage on skills and experience of specialists with in-depth exposure to those technologies. Wipro leveraged its vast talent pool of specialists who had experience in similar technologies.

The other major challenges faced were:

The need to develop in assembly language (due to absence of compiler)

Integration with the micro-controller module (a client module which controls the CDROM pickup)

Coordinating on-site and off-shore resources closely with client teams to be in tune with changes in priority of implementation – this was the first time that this division was outsourcing development.

The solution

The client initially approached Wipro for a simple audio player system consisting of a MP3 decoder, a CDROM decoder and a sample rate converter. After successfully completing that, Wipro went much further and was able to successfully demonstrate the enhanced performance of Wipro’s MP3 decoder code IP.

Wipro role

The entire software development was done offshore with only integration support provided on-site. Throughout the developmental phases, Wipro worked closely with the customer in defining the hardware architecture and hardware configuration of the system.

	With the success of the initial engagement, the client leveraged Wipro’s skills in designing the hardware architecture for the audio player. The success of the first project together with the consultancy on the hardware architecture started a fruitful relationship.
	The client soon started to involve Wipro in its product plans which finally led to the advanced audio player solution.
	This product involved a couple of advanced audio decoders, a CD browsing application, a micro-kernel, CD file-systems as well as the development of a debugger for a dual DSP system.

Salient features

A team of Wipro engineers designed the audio player comprising of:

	Advanced audio decoders, optimized for MIPS and memory
	A micro-kernel, providing preemptive scheduling and task synchronization mechanisms
	An application for browsing the contents of the CDROM
	An application to support different modes of playing out the CD contents
	A CDROM decoder performing Reed-Solomon error detection and correction
	A sample rate converter for audio post processing
	CDROM filesystems (ISO9660 & UDF) to access the CD contents
	Interrupt service routines (ISRs) to handle the input, the output and the communication between the two processors and micro-controller

The benefits

	Leveraged Wipro’s proven expertise in Audio codec related technologies to architect and develop a complex product involving advanced audio technology.
	Development on a simple 24bit fixed point DSP processor, to achieve the correct balance between MIPS and memory.
	Software partitioning across 2 DSP processors (to overcome the shortage of processing power and memory)
	Leveraged on skills available within Wipro to gain time to market advantage
	Outsourcing the total solution allowed the customer to focus on their own priority work


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