Transport Stream Entry Point Mapping for Mixed Audio Encoding

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Solution Overview

Problem

Existing techniques fail to provide efficient playback of transport streams containing TS packets from audio streams encoded using different methods, specifically when these packets are multiplexed together, leading to difficulties in synchronization and random access.

Innovation Solution

A recording apparatus and method that receive and process transport streams with packets encoded using different methods, creating a table based on time information to set entry points and enable accurate decoding and playback, allowing for random access.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If TS packets from audio streams encoded using different methods are multiplexed into a single transport stream, then the adaptability and versatility of the audio system is improved, but the complexity of decoding and synchronization increases

Engineering Contradiction:

Improveability to handle different audio encoding methodsVSAvoidcomplexity of decoding and synchronization

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by pre-processing the transport stream during recording to identify and mark entry points where variable-length encoded audio packets begin. This advance preparation creates a mapping table that stores the relationship between presentation time stamps (PTS) and packet positions, so that during playback the system can directly jump to the correct decoding position without complex real-time analysis, thus resolving the contradiction between handling multiple encoding methods and maintaining simple decoding.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If random access to multiplexed audio streams is enabled, then the ease of operation is improved, but the measurement precision of time synchronization becomes more difficult

Engineering Contradiction:

Improverandom access capabilityVSAvoidtime synchronization accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent introduces an intermediary mapping table that acts as a bridge between the PTS (time domain) and packet positions (space domain). This mapping table stores pre-calculated entry points for variable-length encoded packets, allowing the playback system to perform accurate random access by simply looking up the PTS in the table to find the corresponding packet position, thereby maintaining both ease of operation and time synchronization precision without complex real-time calculations.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS7978955B2Recording device, recording method, reproducing device, reproducing method, program, and recording medium

Publication Date: 2011.07.12 SONY GROUP CORP

AI summary

The present invention relates to a recording apparatus, a recording method, a playback apparatus, a playback method, a program, and a recording medium in which random access playback of TS of audio data encoded using different encoding methods can be performed. A controller obtains PTS from TS, and sets a BS audio TS packet 261-1 as an entry point when an HQ audio TS packet 271-1 having the same PTS exists after the BS audio TS packet 261-1 in the TS. Further, the controller generates EP_map based on the PID of the BS audio ES and the HQ audio ES, the source packet number of the BS audio TS packet 261-1 set as the entry point, and the PTS.