Generating method for audio file and playing method and device for audio file

Abstract

The invention discloses a generating method for an audio file and a playing method and device for the audio file. The generating method includes the steps that audio data and the total time length of the audio data are obtained, and the audio data are coded according to a preset time length step value; a preset value of the reserved head of the audio file is obtained; according to the total time length of the audio data, the preset time length step value, the coded audio code data and the preset value of the reserved head of the file, a key frame numerical value pair sequence is generated; cubic spline interpolating is performed on the key frame numerical value pair sequence to generate a cubic spline function written into the head of the audio file, and the coded audio code data are written into the audio file. On the premise that only a few storage spaces are added, key frames are added to the audio file through cubic spline interpolating, the problems that common key frame storage occupies resources and is poor in precision are avoided, and meanwhile progress control over playing of the audio file is achieved.

Description

technical field [0001] The present invention relates to the field of information technology, in particular to a method and device for generating audio files, and a method and device for playing audio files. Background technique [0002] In related technologies, the following two methods are usually used to encode the original audio data to generate audio files: the first method uses a constant bit rate to encode the original audio data; the second method uses a non-constant bit rate (such as variable length bit rate) to encode the original audio data, first, the audio file is saved as a non-constant bit rate, and then converted to a constant bit rate by a format conversion tool and played back. [0003] However, using a constant bit rate in the first method means that more traditional encoding formats, such as MP3, are often used. In the case of ensuring sound quality, a larger bit rate is required, which will increase the bandwidth of the live broadcast. More pressure will...

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Problems solved by technology

[0003] However, using a constant bit rate in the first method means that more traditional encoding formats, such as MP3, are often used. In the case of ensuring sound quality, a larger bit rate is required, which will increase the bandwidth of the live broadcast. more pressure, and the CPU usage of traditional encoding formats will be relatively high when encoding

In the second method, because the transcoding process is often time-consuming, the audio after the live broadcast cannot be played back at the first time, so the real-time performance of the audio file is not high, and the audio with a non-constant bit rate is Cannot control progress during playback

[0007] However, it can be seen from Table 1 that when the total duration of the audio file is longer, the more value pairs need to be stored, and the larger the occupied space will be, resulting in the increase of the audio file

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