Input buffer management for the playback control for media players

Abstract

Input buffer management of the playback control for MP3 players includes (1) initializing a totalizer to zero, (2) finding a synchronization word of a frame, (3) decoding a header, (4) calculating the size of a main_data field, and (5) decoding the enclosed audio data. If it is determined the value contained in the totalizer is less than the main_data_begin of this frame, store the main_data of the frame in an input buffer, add the size of the main_data to the totalizer, and repeat the process starting with finding the synchronization word of a next frame until the totalizer is greater or equal to the main_data_begin of the then current frame. At this point, all of the audio data required by the frame is currently available and decoding and playing can continue as normal.

Description

technical field [0001] The present invention provides a method for managing the input buffer of a recording and playback controller of a dynamic image compression standard audio layer III (MP3) player, especially a method for storing enough data in the main_data area in advance for decoding, so that The MP3 player can start playing MP3 files from any audio frame or starting audio frame. Background technique [0002] The motion picture compression standard Audio Layer III (Motion Picture Experts Group Layer IIIAudio, MP3) is in line with the International Organization for Standardization and International Electrotechnical Commission (International Organization for Standardization and International Electrotechnical Commission, ISO / IEC) high sound quality and high decoding efficiency (group translation Performance) an audio standard. [0003] refer to figure 1 , figure 1 A schematic diagram of reading an MP3 file for the MP3 player 10. MP3 files are stored in an optical dis...

AI Technical Summary

Problems solved by technology

However, in some playback modes (for example: loop playback mode, rewind playback mode), the syntax analyzer 101 will not be able to provide data to the MP3 decoder for decoding from the first audio frame, and in some cases , the MP3 file will be damaged so that the main_data_begin area cannot store correct data. The above situations will make the MP3 decoder unable to read the first audio frame smoothly

However, once the MP3 decoder ignores the data recorded in the main_data_begin area and directly decodes the audio frame, it will make the MP3 decoder unable to decode completely correctly and cause the sound effect played at the beginning to pop.

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