A method for converting media playback modes of subway trains

Abstract

The invention provides a method for switching a subway train media playing mode and belongs to the field of embedded computers. The method is implemented through three modules which are the initialization module, a live broadcasting-to-recorded broadcasting module and a recorded broadcasting-to-live broadcasting module. The initialization module initializes a communication thread, a recorded broadcasting thread and a real-time video data stream receiving thread, verifies local video files and starts recorded broadcasting playing operation. The live broadcasting-to-recorded broadcasting module and the recorded broadcasting-to-live broadcasting module process heartbeat signals and emergency messages, receive real-time video data streams, read the actual frame-loss rate and make judgment in a hysteresis loop mode so as to determine whether the playing mode is switched or not. The method can be applied to a subway train media player, it is guaranteed that the real-time video data streams are smoothly played under the severe wireless network environment, and playing jolts are avoided.

Description

technical field [0001] The invention belongs to the field of embedded computers, and relates to a method for converting a media playback mode of a subway train. Background technique [0002] Urban subway projects include a variety of construction projects and complex processes. In addition to ensuring the safe and high-speed operation of subway vehicles, the continuous improvement of related supporting service facilities is also required. Media broadcasting is one of the contents. The media playback system takes the computer as the core, receives the service information transmitted by the network, and then processes the information such as encoding and decoding, and finally provides information services to the passengers through the vehicle-mounted display terminal as the medium, so as to ensure the safety and convenience of the passengers to take the rail transit. The media playback system not only needs to receive and urgently insert emergency alarm information from the gr...

AI Technical Summary

Problems solved by technology

The methods of traditional media players to achieve automatic switching of playback modes are mostly based on whether there is real-time video data stream on the network. Considering the uncertainty of the operating environment of subway rail transit, the subway may pass through tunnels, viaducts and other areas with very harsh wireless network environments at any time. , the wireless communication quality between the ground control room and the on-board wireless receiver cannot be guaranteed, which causes the real-time video data stream and emergency message insertion signal forwarded by the on-board wireless receiver to the media player to be unstable. Traditional media players detect After the real-time video data stream is interrupted, it will automatically switch to the recording and broadcasting mode. If the wireless signal is intermittent, it will cause the media playback system to switch repeatedly in the recording and broadcasting and live broadcasting modes. This kind of turbulence is unbearable for passengers; after improvement The media player will add a video data buffer mechanism to avoid playback bumps to a certain extent, but because the buffer needs to be filled, it will cause video lag when switching to real-time video playback mode

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