Method and device for resynchronizing audio code streams
A technology of re-synchronization and code stream, which is applied in the field of re-synchronization method and re-synchronization device of audio code stream, can solve problems such as decoder crash, decoding process cannot be carried out normally, PCM signal contains impact noise, etc., so as to avoid the effect of impact
Inactive Publication Date: 2011-11-09
VIMICRO CORP
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However, due to the existence of qualified pseudo-sync words in the audio stream data, and this method lacks the necessary verification mechanism, it is very easy to achieve wrong re-synchronization
When the decoder decodes an audio frame, if it does not start decoding from the frame header, the decoding process will not proceed normally, and may exit the decoding process halfway; even if the decoding process is completed, the reconstructed PCM signal will contain impact noise; when the error is serious Codec freezes or crashes
Although the above is mainly explained with MP3 code stream as an example, the same problem also exists for audio code streams in other formats. Therefore, a new audio code stream resynchronization scheme is urgently needed
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[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. It should be noted that, in order to better illustrate the technical solutions, in the following embodiments, the audio code stream of MP3 is used as an example to illustrate the technical solutions of each embodiment. Those skilled in the art can understand that the described The technical solution is not only suitable for MP3, but also suitable for MP1, MP2 and other audio code streams in various formats, which does not limit the scope of protection of the present i...
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The invention discloses a method and device for resynchronizing audio code streams. The method for resynchronizing audio code streams comprises the steps of: searching a word to be synchronized from an audio code stream; extracting a frame header by taking the word to be synchronized as a starting point after the word to be synchronized is searched; and checking the frame head, and re-decoding from the frame head after passing through checking. In the resynchronization process, a checking mechanism is introduced, thus accurate resynchronization can be realized, and the decoding process can be carried out smoothly.
Description
technical field [0001] The present invention mainly relates to the field of audio decoding processing, in particular to a resynchronization method and resynchronization device for audio code streams. Background technique [0002] Audio files usually exist in the form of audio streams, such as MPEG (Moving Picture Experts Group, dynamic image compression) Audio Layer 1 (MP1), MPEG Audio Layer 2 (MP2), MPEG Audio Layer 3 (MP3) and so on. Taking MP3 (Moving Picture Experts Group AudioLayer3, an audio compression method) as an example, the basic unit of an MP3 file is a frame, and the head of each audio frame is a 4-byte frame header, followed by several bytes of audio data such as figure 1 shown. The first 11 bits (bits) of the frame header are all 1 (if you do not need to support MPEG2.5, it can be considered as 12bits), as a synchronization word mark, marking the beginning of the audio frame, and the frame header also contains ID (Identity , ID code), code rate, sampling r...
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Login to View More IPC IPC(8): H04N7/56H04N7/64H04N19/89
Inventor 邓昊
Owner VIMICRO CORP