This paper presents the design and implementation of a low-cost, high-definition screen media system based on the OMAP3730 platform. By leveraging the powerful computing capabilities of the programmable C64+DSP core, the system enables hardware-accelerated playback of common video formats, while software-based decoding handles less frequent formats. Additionally, the DSP is utilized to support screen rotation, allowing for adaptive playback on both horizontal and vertical displays. This approach optimizes performance and user experience in embedded digital video applications.
With the rapid development of mobile internet and multimedia technologies, digital video has become a key component in modern life. However, achieving high-quality video playback in low-cost and low-power environments remains a challenge. ARM processors offer rich peripheral support but limited computing power, while Harvard architecture-based systems provide strong computational capabilities but lack peripheral flexibility. The OMAP3730, a dual-core chip combining an ARM Cortex-A8 (1GHz) and a programmable C64+DSP (800MHz), offers an ideal solution by integrating the strengths of both architectures.
The system described in this paper uses the GStreamer framework for video processing. GstDiscover is employed to analyze video files, determining their encoding type and resolution. Based on this information, the system decides whether to use hardware acceleration via the DSP or fall back to software decoding. The GStreamer pipeline is designed to efficiently handle both common and rare video formats, ensuring smooth playback across different scenarios.
GStreamer's modular architecture allows developers to build complex multimedia applications by linking various elements. These elements perform specific tasks such as data input, decoding, and output. For example, a simple Ogg player pipeline includes a source element, a demuxer, decoders, and sinks for audio and video. By replacing certain elements with DSP-accelerated versions like TIViddec and TIDmaiVideoSink, the system achieves efficient hardware decoding, significantly reducing CPU load.
For video formats not supported by hardware decoding, Mplayer is used due to its broader compatibility. To support screen rotation, the application leverages QT for interface control and integrates custom plugins for GStreamer and Mplayer. The DSP is also used to implement matrix transposition for image rotation, though it requires software execution on the fixed-point DSP of OMAP3730.
TI’s C6Accel library provides a unified interface for commonly used DSP algorithms, including signal processing, image processing, and mathematical operations. These functions are crucial for optimizing video processing tasks and improving system efficiency. By combining ARM and DSP resources, the system achieves a balance between performance and power consumption, making it suitable for a wide range of embedded applications.
In conclusion, the low-cost high-definition screen media system based on OMAP3730 demonstrates the advantages of a heterogeneous computing approach. It effectively utilizes the strengths of both ARM and DSP cores, offering a scalable and efficient solution for embedded digital video systems. This work highlights the potential of such platforms in future multimedia applications.
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