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Rockbox mail archiveSubject: RE: search a stringRE: search a string
From: Linus Nielsen Feltzing <linus_at_haxx.se>
Date: Fri, 6 Sep 2002 20:42:36 +0200 On Fri, 6 Sep 2002 14:20:54 -0400, John Wood wrote: > > The MP3 buffer is a ring buffer that wraps at the end. Thus, the > > unused memory can be anywhere in that buffer, depending on where > the > > data was loaded the last time. > > > What tells it where the buffer starts and ends? And how often can > you tell it? It's a ring buffer. Basically, two pointers tell where it starts and ends. The DMA handler reads data using the mp3buf_read index, and advances it when the data has been played. The disk reader writes data using the mp3buf_write index. The buffer is empty when mp3buf_read and mp3buf_write are equal. The size of the loaded but unplayed data is thus mp3buf_write-mp3buf_read. It's all in mpeg.c if you want to dive deeper into it. /Linus -- Linus Nielsen Feltzing, linus_at_haxx.se on 2002-09-06Received on 2002-09-06 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |