Method and device for addressing audio file with variable bit rate (VBR)

An audio file and variable code rate technology, applied in special data processing applications, instruments, electrical digital data processing, etc. The effect of ensuring accuracy and reducing waiting time

Active Publication Date: 2012-04-04
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

The main disadvantage of this method is: by traversing the frame header to calculate th...

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  • Method and device for addressing audio file with variable bit rate (VBR)
  • Method and device for addressing audio file with variable bit rate (VBR)
  • Method and device for addressing audio file with variable bit rate (VBR)

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Embodiment Construction

[0054] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0055] The general file structure of a VBR audio file is as follows figure 1 As shown, the file header contains information necessary for decoding such as audio encoding format, sampling rate, channel number, frame length, etc., and the frame header of each frame usually includes the start flag (frame header flag) of a frame and the frame header. length. This kind of file organization structure is the most common in VBR audio files, and audio format files such as aac / mp3 / wma that are usually encountered meet this file structure method. The addressing methods designed in the present invention all basically have this kind of file organization structure.

[0056] One of the core ideas of the present invention is: by analyzing the f...

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Abstract

The invention provides a method and a device for addressing an audio file with a variable bit rate (VBR). The method comprises the following steps of: generating an addressing table according to file header information and frame header information of the audio file, wherein play time points and absolute addresses corresponding to the play time points are recorded in the addressing table, and one play time point is recorded at intervals of n frames; and searching a play time point in the addressing table according to addressing target time, and taking the absolute address corresponding to the play time point as an addressing target position. By the method and the device, the function of addressing the audio file with the VBR can be accurately and quickly realized to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of audio processing, in particular to an addressing method for a variable-code-rate audio file and an addressing device for a variable-code-rate audio file. Background technique [0002] Variable bit rate (Variable Bit Rate, VBR, also known as dynamic bit rate) encoding refers to the adaptive adjustment of the output bit rate of the encoder (or the input bit rate of the decoder) according to the input source signal of the encoder. It is to keep the output quality unchanged, not to keep the output bit rate unchanged. It is an encoding method that takes quality as the premise and takes file size into account. VBR is suitable for storage, but not for streaming. It can make better use of limited storage space: use more codewords to encode high-complexity segments, and use fewer codewords to encode low-complexity segments. segment is encoded. Now the mainstream audio compression formats are variable bit rate, f...

Claims

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Application Information

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IPC IPC(8): G06F17/30
Inventor 徐磊
Owner WUXI ZGMICRO ELECTRONICS CO LTD
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