Direct displaying method and device for video decoding

Abstract

The invention provides a direct displaying method and device for video decoding. The method comprises the following steps: after video source data stream of DDR (double data rate) is read, a macro block of each image is decoded, and location information of the macro block and image data after decoding are obtained; the location of the macro block in a maximum macro block is judged, and a maximum macro block cache unit is filled with image data obtained after the sub macro block is decoded according to the location information; data volume is controlled to be sent to two macro block slice cache units for circulated filling until the whole image is decoded; which macro block slice cache unit is read is selected according to the effective full state of the two macro block slice cache units, and image line data are processed and sent to a screen for display by the aid of a display control unit. According to the direct displaying method, DDR write-back operation of a video decoder and read operation of a display controller on video images in the DDR in the traditional data path are saved, the requirement of the whole decoding display for the bandwidth of the DDR is reduced greatly, and the cost and power consumption of products can be reduced greatly.

Description

technical field [0001] The invention relates to a video decoding direct display method and device. Background technique [0002] As the resolution of video sources played on mobile devices is getting higher and higher, from 720p to 1080p to 4K resolution in the past, while maintaining the same playback frame rate, the higher the resolution of the video image, the higher the bandwidth of the DDR memory. The higher the requirement. In order to increase the bandwidth of the DDR memory, it is usually necessary to increase the DDR channel or increase the bit width of each channel, but these methods will greatly increase the cost and power consumption of the product. Therefore, it would be very meaningful if the bandwidth requirements for video playback with the same resolution can be fundamentally reduced. [0003] The current video decoding data path is: after the video decoder reads and decodes the video source from the DDR, stores the decoded video image back to the DDR, and...

AI Technical Summary

Problems solved by technology

However, the technical difficulty is that video decoding is based on image block decoding, and the display controller is based on the display of image lines. The difference in data order makes it very difficult for video decoders to directly display control, so the present invention proposes a video The method of connecting the decoder directly to the display controller saves the DDR write-back operation of the video decoder in the traditional data path and the read operation of the video image in the DDR by the display controller, which greatly reduces the bandwidth demand of the entire decoding display for DDR, and Can greatly reduce product cost and power consumption

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