Message-Based Content Synchronization Across Multiple Devices
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Solution Overview
Problem
In unified communications platforms, synchronizing media playback across multiple devices with different capabilities and network conditions is challenging due to unsynchronized clocks and varying network delays, leading to sub-optimal viewing experiences.
Innovation Solution
Each client device synchronizes its clock with a reference time server and sends update messages with timestamps to ensure all devices are playing the same content at the same time, using a leaderless peer-to-peer protocol for sub-second precision synchronization, allowing each device to optimize playback based on its capabilities and network connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If screen sharing is used to synchronize content across multiple devices, then content coordination is achieved, but devices with different capabilities and network conditions cannot fully utilize their potential, resulting in sub-optimal viewing experiences
Solution Approach 1:
The system segments the content delivery by having each device independently access and playback content from its own media stream rather than sharing a single screen stream. This allows each device to optimize its playback based on local capabilities while maintaining synchronization through coordinated control signals.
Solution Approach 2:
The system introduces an intermediary synchronization mechanism using control signals and timestamps that mediate between devices with different capabilities. These control signals coordinate playback state across devices without requiring direct screen sharing, enabling both adaptability and synchronization.
2Reliability
If clocks on multiple devices are not synchronized, then devices can operate independently, but content playback cannot be coordinated across devices
Solution Approach 1:
The system uses feedback through control signals that carry playback state information and timestamps between devices. Each device sends control signals indicating its playback position, and receives control signals from others, using this feedback to coordinate playback timing without requiring pre-synchronized clocks.
Solution Approach 2:
The system performs preliminary actions by establishing control signal exchange protocols and timestamp reference frameworks before content playback begins. This preliminary setup enables devices to independently operate while still achieving coordinated playback through the pre-established communication framework.
3Use of energy by moving object
If a leaderless peer-to-peer protocol is used for synchronization, then computing resource consumption is minimized, but achieving sub-second precision synchronization becomes more challenging
Solution Approach 1:
Each device independently processes received control signals and autonomously determines its playback timing based on local clock and received timestamps. This self-service approach eliminates the need for a centralized synchronization server, minimizing computing resource consumption while achieving precision through distributed timestamp comparison and coordination.
Data Source
AI summary
A computer implemented method synchronizes content state on multiple devices that are independently accessing the content. Each device synchronizes their clock and broadcasts an update message that includes an update message timestamp obtained from the clock and a playing state of content being played on the device. Update messages are received from the other devices and the corresponding time stamps are compared to identify the most recent update message and most recent playing state of the content. Each device updates to play the content from the most recent playing state included in the most recent update message.