Control device and method of audio and video playing status based on the built-in system
An audio and video playback and embedded system technology, applied in the field of audio and video playback state control devices, can solve the problem of exceeding the processing capability and decoding capability of the processor, limiting the double-speed capability of the embedded audio and video playback system, and the large size of the embedded audio and video playback system. Complexity and other issues to achieve the effect of enhancing scalability and ease of use
Inactive Publication Date: 2009-07-29
ZHEJIANG UNIV
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Problems solved by technology
Embedded audio and video playback systems are designed to control the playback speed. Usually, it is necessary to perform fast playback, slow playback, fast forward, fast rewind, single-frame playback, and single-frame rewind. At the same time, each playback state needs to be switched. The traditional audio and video playback system brings greater complexity
At the same time, fast-forward and rewind often exceed the processor's processing and decoding capabilities, which limits the speed-up capability of the embedded audio and video playback system.
Method used
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[0031] Such as figure 1 Shown, a kind of audio and video playback state control device based on embedded system, comprises:
[0032] Code stream reader 110, for reading audio and video data code stream;
[0033] The code stream buffer 120 is connected to the code stream reader 110 for buffering the code stream and controlling the flow rate of the code stream so as to realize playback speed control;
[0034] The code stream filter 130 is connected to the code stream buffer 120, which is used to calculate the decoding capability of the system, discards part of the code stream according to the calculation results, and realizes super decoding capability playback;
[0035] The code stream transmitter 140 is connected to the code stream filter 130 for sending the code stream to the decoder;
[0036] The decoder 150 is connected to the code stream transmitter 140, receives the audio and video data code stream sent by the code stream transmitter 140, and decodes and displays it;
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The disclosed audio / video display state controller based on embedded system comprises: a code reader, a code buffer, a filter, a transmitter, a decoder, a controller for display direction, a controller for display speed, a controller for display performance, and a controller for display state. Compared to prior art, this invention applies three independent modules to control direction, speed and performance on reading code flow, improves display performance by controlling extract-frame, and enhances system expansibility greatly.
Description
technical field [0001] The invention relates to the technical field of digital video processing, in particular to an audio and video playback state control device and method based on an embedded system. Background technique [0002] With the rapid development of information technology (IT), the rapid popularization of the Internet, and the acceleration of the integration of 3C (computer, communication, consumer electronics), the digital age has come. Digital products with embedded network multimedia system as the technical core have become mainstream products in the digital age. Typical embedded network multimedia system embedded video surveillance system (DVR), IP set-top box (IP-STB), portable media player (PMP) and other products all include embedded video playback system. Embedded audio and video playback systems are designed to control the playback speed. Usually, it is necessary to perform fast playback, slow playback, fast forward, fast rewind, single-frame playback,...
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IPC IPC(8): H04N7/52H04N7/26H04N7/24H04N19/117
Inventor 陈耀武田翔
Owner ZHEJIANG UNIV